24AA128/24LC128/24FC128

128K I2C™ CMOS Serial EEPROM

Device Selection Table Description
Part VCC Max. Clock Temp. The Microchip Technology Inc. 24AA128/24LC128/
Number Range Frequency Ranges 24FC128 (24XX128*) is a 16K x 8 (128 Kbit) Serial
Electrically Erasable PROM (EEPROM), capable of
24AA128 1.8-5.5V 400 kHz(1) I operation across a broad voltage range (1.8V to 5.5V).
24LC128 2.5-5.5V 400 kHz I, E It has been developed for advanced, low-power
(2)
applications such as personal communications or data
24FC128 1.8-5.5V 1 MHz I acquisition. This device also has a page write capabil-
Note 1: 100 kHz for VCC < 2.5V. ity of up to 64 bytes of data. This device is capable of
2: 400 kHz for VCC < 2.5V. both random and sequential reads up to the 128K
boundary. Functional address lines allow up to eight
devices on the same bus, for up to 1 Mbit address
Features
space. This device is available in the standard 8-pin
• Low-power CMOS technology: plastic DIP, SOIC (150 and 208 mil), TSSOP, MSOP,
- Maximum write current 3 mA at 5.5V DFN and 14-lead TSSOP packages.
- Maximum read current 400 µA at 5.5V
- Standby current 100 nA typical at 5.5V Block Diagram
• 2-wire serial interface bus, I2C™ compatible A0 A1 A2 WP HV Generator
• Cascadable for up to eight devices
• Self-timed erase/write cycle
• 64-byte Page Write mode available I/O Memory
EEPROM
Control Control XDEC
• 5 ms max write cycle time Logic Logic
Array
• Hardware write-protect for entire array Page Latches
• Output slope control to eliminate ground bounce
• Schmitt Trigger inputs for noise suppression I/O
SCL
• 1,000,000 erase/write cycles YDEC

• Electrostatic discharge protection > 4000V SDA

• Data retention > 200 years
• 8-pin PDIP, SOIC, TSSOP, MSOP and DFN VCC
packages, 14-lead TSSOP package VSS Sense Amp.
R/W Control
• Standard and Pb-free finishes available
• Temperature ranges:
- Industrial (I): -40°C to +85°C
- Automotive (E): -40°C to +125°C

Package Types
PDIP/SOIC TSSOP/MSOP * TSSOP DFN

A0 1 14 VCC
A0 1 8 VCC A0 1 8 A0 1 8 VCC
VCC A1 2 13 WP
24XX128
24XX128

2
24XX128

24XX128

A1 2 7 WP A1 2 7 WP NC 3 12 NC A1 7 WP
NC 4 11 NC A2 3 6 SCL
A2 3 6 SCL A2 3 6 SCL 5 10 NC
NC
6 9 VSS 4 5 SDA
VSS 4 5 SDA 4 5 A2 SCL
VSS SDA
VSS 7 8 SDA

Note: * Pins A0 and A1 are no-connects for the MSOP package only.

*24XX128 is used in this document as a generic part number for the 24AA128/24LC128/24FC128 devices.

 2004 Microchip Technology Inc. DS21191M-page 1

24AA128/24LC128/24FC128
1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings(†)

VCC .............................................................................................................................................................................6.5V
All inputs and outputs w.r.t. VSS ......................................................................................................... -0.6V to VCC +1.0V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied ................................................................................................-40°C to +125°C
ESD protection on all pins ......................................................................................................................................................≥ 4 kV

† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above those
indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.

TABLE 1-1: DC CHARACTERISTICS

Electrical Characteristics:
DC CHARACTERISTICS Industrial (I): VCC = +1.8V to 5.5V TA = -40°C to +85°C
Automotive (E): VCC = +2.5V to 5.5V TA = -40°C to 125°C
Param.
Sym. Characteristic Min. Max. Units Conditions
No.
D1 — A0, A1, A2, SCL, SDA, and — — — —
WP pins:
D2 VIH High-level input voltage 0.7 VCC — V —
D3 VIL Low-level input voltage — 0.3 VCC V VCC ≥ 2.5V
0.2 VCC V VCC < 2.5V
D4 VHYS Hysteresis of Schmitt Trigger 0.05 VCC — V VCC ≥ 2.5V (Note 1)
inputs (SDA, SCL pins)
D5 VOL Low-level output voltage — 0.40 V IOL = 3.0 mA @ VCC = 4.5V
IOL = 2.1 mA @ VCC = 2.5V
D6 ILI Input leakage current — ±1 µA VIN = VSS or VCC, WP = VSS
VIN = VSS or VCC, WP = VCC
D7 ILO Output leakage current — ±1 µA VOUT = VSS or VCC
D8 CIN, Pin capacitance — 10 pF VCC = 5.0V (Note 1)
COUT (all inputs/outputs) TA = 25°C, fC = 1 MHz
D9 ICC Read Operating current — 400 µA VCC = 5.5V, SCL = 400 kHz
ICC Write — 3 mA VCC = 5.5V
D10 ICCS Standby current — 1 µA TA = -40°C to +85°C
SCL = SDA = VCC = 5.5V
A0, A1, A2, WP = VSS
— 5 µA TA = -40°C to 125°C
SCL = SDA = VCC = 5.5V
A0, A1, A2, WP = VSS
Note 1: This parameter is periodically sampled and not 100% tested.

DS21191M-page 2  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
TABLE 1-2: AC CHARACTERISTICS
Electrical Characteristics:
AC CHARACTERISTICS Industrial (I): VCC = +1.8V to 5.5V TA = -40°C to +85°C
Automotive (E): VCC = +2.5V to 5.5V TA = -40°C to 125°C
Param.
Sym. Characteristic Min. Max. Units Conditions
No.
1 FCLK Clock frequency — 100 kHz 1.8V ≤ VCC < 2.5V
— 400 2.5V ≤ VCC ≤ 5.5V
— 400 1.8V ≤ VCC < 2.5V 24FC128
— 1000 2.5V ≤ VCC ≤ 5.5V 24FC128
2 THIGH Clock high time 4000 — ns 1.8V ≤ VCC < 2.5V
600 — 2.5V ≤ VCC ≤ 5.5V
600 — 1.8V ≤ VCC < 2.5V 24FC128
500 — 2.5V ≤ VCC ≤ 5.5V 24FC128
3 TLOW Clock low time 4700 — ns 1.8V ≤ VCC < 2.5V
1300 — 2.5V ≤ VCC ≤ 5.5V
1300 — 1.8V ≤ VCC < 2.5V 24FC128
500 — 2.5V ≤ VCC ≤ 5.5V 24FC128
4 TR SDA and SCL rise time — 1000 ns 1.8V ≤ VCC < 2.5V
(Note 1) — 300 2.5V ≤ VCC ≤ 5.5V
— 300 1.8V ≤ VCC ≤ 5.5V 24FC128
5 TF SDA and SCL fall time — 300 ns All except, 24FC128
(Note 1) — 100 1.8V ≤ VCC ≤ 5.5V 24FC128
6 THD:ST Start condition hold time 4000 — ns 1.8V ≤ VCC < 2.5V
A 600 — 2.5V ≤ VCC ≤ 5.5V
600 — 1.8V ≤ VCC < 2.5V 24FC128
250 — 2.5V ≤ VCC ≤ 5.5V 24FC128
7 TSU:ST Start condition setup time 4700 — ns 1.8V ≤ VCC < 2.5V
A 600 — 2.5V ≤ VCC ≤ 5.5V
600 — 1.8V ≤ VCC < 2.5V 24FC128
250 — 2.5V ≤ VCC ≤ 5.5V 24FC128
8 THD:DA Data input hold time 0 — ns (Note 2)
T
9 TSU:DA Data input setup time 250 — ns 1.8V ≤ VCC < 2.5V
T 100 — 2.5V ≤ VCC ≤ 5.5V
100 — 1.8V ≤ VCC ≤ 5.5V 24FC128
10 TSU:ST Stop condition setup time 4000 — ns 1.8 V ≤ VCC < 2.5V
O 600 — 2.5 V ≤ VCC ≤ 5.5V
600 — 1.8V ≤ VCC < 2.5V 24FC128
250 — 2.5 V ≤ VCC ≤ 5.5V 24FC128
11 TSU:WP WP setup time 4000 — ns 1.8V ≤ VCC < 2.5V
600 — 2.5V ≤ VCC ≤ 5.5V
600 — 1.8V ≤ VCC ≤ 5.5V 24FC128
Note 1: Not 100% tested. CB = total capacitance of one bus line in pF.
2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
3: The combined TSP and VHYS specifications are due to new Schmitt Trigger inputs, which provide improved
noise spike suppression. This eliminates the need for a TI specification for standard operation.
4: This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model, which can be obtained from Microchip’s web site:
www.microchip.com.

 2004 Microchip Technology Inc. DS21191M-page 3

24AA128/24LC128/24FC128
TABLE 1-2: AC CHARACTERISTICS (CONTINUED)
Electrical Characteristics:
AC CHARACTERISTICS Industrial (I): VCC = +1.8V to 5.5V TA = -40°C to +85°C
Automotive (E): VCC = +2.5V to 5.5V TA = -40°C to 125°C
Param.
Sym. Characteristic Min. Max. Units Conditions
No.
12 THD:WP WP hold time 4700 — ns 1.8V ≤ VCC < 2.5V
1300 — 2.5V ≤ VCC ≤ 5.5V
1300 — 1.8V ≤ VCC ≤ 5.5V 24FC128
13 TAA Output valid from clock — 3500 ns 1.8V ≤ VCC < 2.5V
(Note 2) — 900 2.5V ≤ VCC ≤ 5.5V
— 900 1.8V ≤ VCC < 2.5V 24FC128
— 400 2.5V ≤ VCC ≤ 5.5V 24FC128
14 TBUF Bus free time: Time the bus 4700 — ns 1.8V ≤ VCC < 2.5V
must be free before a new 1300 — 2.5V ≤ VCC ≤ 5.5V
transmission can start 1300 — 1.8V ≤ VCC < 2.5V 24FC128
500 — 2.5V ≤ VCC ≤ 5.5V 24FC128
15 TOF Output fall time from VIH 10 + 0.1CB 250 ns All except, 24FC128 (Note 1)
minimum to VIL maximum 250 24FC128 (Note 1)
CB ≤ 100 pF
16 TSP Input filter spike suppression — 50 ns All except, 24FC128 (Notes 1
(SDA and SCL pins) and 3)
17 TWC Write cycle time (byte or — 5 ms —
page)
18 — Endurance 1,000,000 — cycles 25°C (Note 4)
Note 1: Not 100% tested. CB = total capacitance of one bus line in pF.
2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
3: The combined TSP and VHYS specifications are due to new Schmitt Trigger inputs, which provide improved
noise spike suppression. This eliminates the need for a TI specification for standard operation.
4: This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model, which can be obtained from Microchip’s web site:
www.microchip.com.

FIGURE 1-1: BUS TIMING DATA

5 4
2 D4

SCL
7
3 8 9 10
SDA
6
IN
16

13 14
SDA
OUT

(protected)
WP 11 12
(unprotected)

DS21191M-page 4  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.

TABLE 2-1: PIN FUNCTION TABLE

8-pin 8-pin 8-pin 14-pin 8-pin 8-pin
Name Function
PDIP SOIC TSSOP TSSOP MSOP DFN
A0 1 1 1 1 — 1 User Configurable Chip Select
A1 2 2 2 2 — 2 User Configurable Chip Select
(NC) — — — 3, 4, 5 1, 2 — Not Connected
A2 3 3 3 6 3 3 User Configurable Chip Select
VSS 4 4 4 7 4 4 Ground
SDA 5 5 5 8 5 5 Serial Data
SCL 6 6 6 9 6 6 Serial Clock
(NC) — — — 10, 11,12 — — Not Connected
WP 7 7 7 13 7 7 Write-Protect Input
VCC 8 8 8 14 8 8 +1.8V to 5.5V (24AA128)
+2.5V to 5.5V (24LC128)
+1.8V to 5.5V (24FC128)

2.1 A0, A1, A2 Chip Address Inputs 2.3 Serial Clock (SCL)
The A0, A1 and A2 inputs are used by the 24XX128 for This input is used to synchronize the data transfer to
multiple device operations. The levels on these inputs and from the device.
are compared with the corresponding bits in the slave
address. The chip is selected if the compare is true. 2.4 Write-Protect (WP)
For the MSOP package only, pins A0 and A1 are not This pin can be connected to either VSS, VCC or left
connected. floating. Internal pull-down circuitry on this pin will keep
Up to eight devices (two for the MSOP package) may the device in the unprotected state if left floating. If tied
be connected to the same bus by using different Chip to VSS or left floating, normal memory operation is
Select bit combinations. If these pins are left uncon- enabled (read/write the entire memory 0000-3FFF).
nected, the inputs will be pulled down internally to If tied to VCC, write operations are inhibited. Read
VSS. If they are tied to VCC or driven high, the internal operations are not affected.
pull-down circuitry is disabled.
In most applications, the chip address inputs A0, A1, 3.0 FUNCTIONAL DESCRIPTION
and A2 are hard-wired to logic ‘0’ or logic ‘1’. For
applications in which these pins are controlled by a The 24XX128 supports a bidirectional 2-wire bus and
microcontroller or other programmable device, the chip data transmission protocol. A device that sends data
address pins must be driven to logic ‘0’ or logic ‘1’ onto the bus is defined as a transmitter and a device
before normal device operation can proceed. receiving data as a receiver. The bus must be
controlled by a master device which generates the
2.2 Serial Data (SDA) serial clock (SCL), controls the bus access and
generates the Start and Stop conditions while the
This is a bidirectional pin used to transfer addresses 24XX128 works as a slave. Both master and slave can
and data into and out of the device. It is an open drain operate as a transmitter or receiver, but the master
terminal. Therefore, the SDA bus requires a pull-up device determines which mode is activated.
resistor to VCC (typical 10 kΩ for 100 kHz, 2 kΩ for
400 kHz and 1 MHz).
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating the Start and Stop conditions.

 2004 Microchip Technology Inc. DS21191M-page 5

24AA128/24LC128/24FC128
4.0 BUS CHARACTERISTICS The data on the line must be changed during the low
period of the clock signal. There is one bit of data per
The following bus protocol has been defined: clock pulse.
• Data transfer may be initiated only when the bus Each data transfer is initiated with a Start condition and
is not busy. terminated with a Stop condition. The number of the
• During data transfer, the data line must remain data bytes transferred between the Start and Stop
stable whenever the clock line is high. Changes in conditions is determined by the master device.
the data line while the clock line is high will be
interpreted as a Start or Stop condition. 4.5 Acknowledge
Accordingly, the following bus conditions have been Each receiving device, when addressed, is obliged to
defined (Figure 4-1). generate an Acknowledge signal after the reception of
each byte. The master device must generate an extra
4.1 Bus not Busy (A) clock pulse, which is associated with this Acknowledge
Both data and clock lines remain high. bit.
Note: The 24XX128 does not generate any
4.2 Start Data Transfer (B) Acknowledge bits if an internal
A high-to-low transition of the SDA line while the clock programming cycle is in progress.
(SCL) is high determines a Start condition. All A device that acknowledges must pull down the SDA
commands must be preceded by a Start condition. line during the acknowledge clock pulse in such a way
that the SDA line is stable low during the high period of
4.3 Stop Data Transfer (C) the acknowledge related clock pulse. Of course, setup
A low-to-high transition of the SDA line, while the clock and hold times must be taken into account. During
(SCL) is high, determines a Stop condition. All reads, a master must signal an end of data to the slave
operations must end with a Stop condition. by NOT generating an Acknowledge bit on the last byte
that has been clocked out of the slave. In this case, the
4.4 Data Valid (D) slave (24XX128) will leave the data line high to enable
the master to generate the Stop condition.
The state of the data line represents valid data when,
after a Start condition, the data line is stable for the
duration of the high period of the clock signal.
FIGURE 4-1: DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(A) (B) (D) (D) (C) (A)
SCL

SDA

Start Address or Data Stop

Condition Acknowledge Allowed Condition
Valid to Change

FIGURE 4-2: ACKNOWLEDGE TIMING

Acknowledge
Bit

SCL 1 2 3 4 5 6 7 8 9 1 2 3

SDA Data from transmitter Data from transmitter

Transmitter must release the SDA line at this point, Receiver must release the SDA line
allowing the Receiver to pull the SDA line low to at this point so the Transmitter can
acknowledge the previous eight bits of data. continue sending data.

DS21191M-page 6  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
5.0 DEVICE ADDRESSING FIGURE 5-1: CONTROL BYTE
FORMAT
A control byte is the first byte received following the
Start condition from the master device (Figure 5-1). Read/Write Bit
The control byte consists of a 4-bit control code. For the
24XX128, this is set as ‘1010’ binary for read and write Chip Select
operations. The next three bits of the control byte are Control Code Bits
the Chip Select bits (A2, A1, A0). The Chip Select bits
allow the use of up to eight 24XX128 devices on the S 1 0 1 0 A2 A1 A0 R/W ACK
same bus and are used to select which device is
accessed. The Chip Select bits in the control byte must
Slave Address
correspond to the logic levels on the corresponding A2,
A1 and A0 pins for the device to respond. These bits Start Bit Acknowledge Bit
are, in effect, the three Most Significant bits of the word
address.
For the MSOP package, the A0 and A1 pins are not 5.1 Contiguous Addressing Across
connected. During device addressing, the A0 and A1 Multiple Devices
Chip Select bits (Figures 5-1 and 5-2) should be set to
‘0’. Only two 24XX128 MSOP packages can be The Chip Select bits A2, A1,and A0 can be used to
connected to the same bus. expand the contiguous address space for up to 1 Mbit
by adding up to eight 24XX128s on the same bus. In
The last bit of the control byte defines the operation to this case, software can use A0 of the control byte as
be performed. When set to a one, a read operation is address bit A14; A1 as address bit A15; and A2 as
selected. When set to a zero, a write operation is address bit A16. It is not possible to sequentially read
selected. The next two bytes received define the across device boundaries.
address of the first data byte (Figure 5-2). Because
only A13…A0 are used, the upper two address bits are For the MSOP package, up to two 24XX128 devices
“don’t care” bits. The upper address bits are transferred can be added for up to 256 Kbit of address space. In
first, followed by the less significant bits. this case, software can use A2 of the control byte as
address bit A16. Bits A0 (A14) and A1 (A15) of the
Following the Start condition, the 24XX128 monitors control byte must always be set to logic ‘0’ for the
the SDA bus checking the device type identifier being MSOP.
transmitted. Upon receiving a ‘1010’ code and
appropriate device select bits, the slave device outputs
an Acknowledge signal on the SDA line. Depending on
the state of the R/W bit, the 24XX128 will select a read
or write operation.

FIGURE 5-2: ADDRESS SEQUENCE BIT ASSIGNMENTS

Control Byte Address High Byte Address Low Byte

A A A A A A A A A A A
1 0 1 0 1 0 R/W X X • • • • • •
2 13 12 11 10 9 8 7 0

Control Chip
X = don’t care bit
Code Select
Bits

 2004 Microchip Technology Inc. DS21191M-page 7

24AA128/24LC128/24FC128
6.0 WRITE OPERATIONS master should transmit more than 64 bytes prior to
generating the Stop condition, the address counter will
6.1 Byte Write roll over and the previously received data will be over-
written. As with the byte write operation, once the Stop
Following the Start condition from the master, the condition is received, an internal write cycle will begin
control code (four bits), the Chip Select (three bits) and (Figure 6-2). If an attempt is made to write to the array
the R/W bit (which is a logic low) are clocked onto the with the WP pin held high, the device will acknowledge
bus by the master transmitter. This indicates to the the command, but no write cycle will occur, no data will
addressed slave receiver that the address high byte will be written and the device will immediately accept a new
follow after it has generated an Acknowledge bit during command.
the ninth clock cycle. Therefore, the next byte
transmitted by the master is the high-order byte of the 6.3 Write-Protection
word address and will be written into the address
pointer of the 24XX128. The next byte is the Least The WP pin allows the user to write-protect the entire
Significant Address Byte. After receiving another array (0000-3FFF) when the pin is tied to VCC. If tied to
Acknowledge signal from the 24XX128, the master VSS or left floating, the write protection is disabled. The
device will transmit the data word to be written into the WP pin is sampled at the Stop bit for every Write
addressed memory location. The 24XX128 acknowl- command (Figure 1-1). Toggling the WP pin after the
edges again and the master generates a Stop Stop bit will have no effect on the execution of the write
condition. This initiates the internal write cycle and cycle.
during this time, the 24XX128 will not generate
Acknowledge signals (Figure 6-1). If an attempt is Note: Page write operations are limited to
made to write to the array with the WP pin held high, the writing bytes within a single physical
device will acknowledge the command, but no write page, regardless of the number of
cycle will occur, no data will be written, and the device bytes actually being written. Physical
will immediately accept a new command. After a byte page boundaries start at addresses
Write command, the internal address counter will point that are integer multiples of the page
to the address location following the one that was just buffer size (or ‘page size’) and end at
written. addresses that are integer multiples of
[page size - 1]. If a Page Write
6.2 Page Write command attempts to write across a
physical page boundary, the result is
The write control byte, word address, and the first data that the data wraps around to the
byte are transmitted to the 24XX128 in much the same beginning of the current page (over-
way as in a byte write. The exception is that instead of writing data previously stored there),
generating a Stop condition, the master transmits up to instead of being written to the next
63 additional bytes, which are temporarily stored in the page, as might be expected. It is,
on-chip page buffer, and will be written into memory therefore, necessary for the applica-
once the master has transmitted a Stop condition. tion software to prevent page write
Upon receipt of each word, the six lower address operations that would attempt to cross
pointer bits are internally incremented by ‘1’. If the a page boundary.
FIGURE 6-1: BYTE WRITE
S
BUS ACTIVITY T S
Control Address Address
MASTER A T
R Byte High Byte Low Byte Data O
T P
SDA LINE S1 0 1 0A AA
2 10 0
XX P

BUS ACTIVITY A A A A
C C C C
X = don’t care bit K K K K

FIGURE 6-2: PAGE WRITE

S
T Control Address Address S
BUS ACTIVITY A T
R Byte High Byte Low Byte Data Byte 0 Data Byte 63
MASTER O
T P
SDA LINE AAA XX P
S10 1 02 100
A A A A A
BUS ACTIVITY C C C C C
K K K K K
X = don’t care bit

DS21191M-page 8  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
7.0 ACKNOWLEDGE POLLING FIGURE 7-1: ACKNOWLEDGE
POLLING FLOW
Since the device will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (This feature can be used to maximize bus
throughput). Once the Stop condition for a Write Send
command has been issued from the master, the device Write Command
initiates the internally timed write cycle. ACK polling
can be initiated immediately. This involves the master
sending a Start condition, followed by the control byte Send Stop
for a Write command (R/W = 0). If the device is still Condition to
busy with the write cycle, then no ACK will be returned. Initiate Write Cycle
If no ACK is returned, the Start bit and control byte must
be resent. If the cycle is complete, then the device will
return the ACK and the master can then proceed with
the next Read or Write command. See Figure 7-1 for Send Start
flow diagram.

Send Control Byte

with R/W = 0

Did Device No
Acknowledge
(ACK = 0)?
Yes

Next
Operation

 2004 Microchip Technology Inc. DS21191M-page 9

24AA128/24LC128/24FC128
8.0 READ OPERATION 8.2 Random Read
Read operations are initiated in much the same way as Random read operations allow the master to access
write operations with the exception that the R/W bit of any memory location in a random manner. To perform
the control byte is set to ‘1’. There are three basic types this type of read operation, the word address must first
of read operations: current address read, random read be set. This is done by sending the word address to the
and sequential read. 24XX128 as part of a write operation (R/W bit set to
‘0’). Once the word address is sent, the master gener-
8.1 Current Address Read ates a Start condition following the acknowledge. This
terminates the write operation, but not before the inter-
The 24XX128 contains an address counter that main-
nal address pointer is set. The master then issues the
tains the address of the last word accessed, internally
control byte again, but with the R/W bit set to a ‘1’. The
incremented by ‘1’. Therefore, if the previous read
24XX128 will then issue an acknowledge and transmit
access was to address ‘n’ (n is any legal address), the
the 8-bit data word. The master will not acknowledge
next current address read operation would access data
the transfer but does generate a Stop condition, which
from address n + 1.
causes the 24XX128 to discontinue transmission
Upon receipt of the control byte with R/W bit set to ‘1’, (Figure 8-2). After a random Read command, the
the 24XX128 issues an acknowledge and transmits the internal address counter will point to the address
8-bit data word. The master will not acknowledge the location following the one that was just read.
transfer, but does generate a Stop condition and the
24XX128 discontinues transmission (Figure 8-1). 8.3 Sequential Read
Sequential reads are initiated in the same way as a
FIGURE 8-1: CURRENT ADDRESS
random read except that after the 24XX128 transmits
READ
the first data byte, the master issues an acknowledge
S
T S
as opposed to the Stop condition used in a random
BUS ACTIVITY A Control Data T read. This acknowledge directs the 24XX128 to
MASTER R Byte Byte O transmit the next sequentially addressed 8-bit word
T P
(Figure 8-3). Following the final byte transmitted to the
SDA LINE S 1 0 1 0 A AA 1 P
2 1 0 master, the master will NOT generate an acknowledge
A N but will generate a Stop condition. To provide
BUS ACTIVITY C O
K sequential reads, the 24XX128 contains an internal
A
C address pointer which is incremented by one at the
K completion of each operation. This address pointer
allows the entire memory contents to be serially read
during one operation. The internal address pointer will
automatically roll over from address 3FFF to address
0000 if the master acknowledges the byte received
from the array address 3FFF.
FIGURE 8-2: RANDOM READ
S S
BUS ACTIVITY T T S
A Control Address Address Control Data
MASTER A T
R Byte High Byte Low Byte R Byte Byte O
T T P
SDA LINE S1 0 1 0 AAA0 XX S 1 0 1 0 A A A1 P
2 1 0 2 1 0
A A A A N
BUS ACTIVITY C C C C O
K K K K A
X = don’t care bit C
K

FIGURE 8-3: SEQUENTIAL READ

Control S
BUS ACTIVITY T
Byte Data (n) Data (n + 1) Data (n + 2) Data (n + X)
MASTER O
P

SDA LINE P
A A A A N
C C C C O
BUS ACTIVITY K K K K A
C
K

DS21191M-page 10  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
9.0 PACKAGING INFORMATION
9.1 Package Marking Information

8-Lead PDIP (300 mil) Example:

XXXXXXXX 24AA128
T/XXXNNN I/P017
YYWW 0310

8-Lead SOIC (150 mil) Example:

XXXXXXXX 24LC128
T/XXYYWW I/SN0310
NNN 017

8-Lead SOIC (208 mil) Example:

XXXXXXXX 24LC128
T/XXXXXX I/SM
YYWWNNN 0310017

8-Lead TSSOP Example:

XXXX 4LC
TYWW I301
NNN 017

 2004 Microchip Technology Inc. DS21191M-page 11

24AA128/24LC128/24FC128
Package Marking Information (Continued)
8-Lead MSOP Example:

XXXXXT 4L128I
YWWNNN 101017

8-Lead DFN-S Example:

XXXXXXX 24LC128
T/XXXXX I/MF
YYWW YYWW
NNN NNN

14-Lead TSSOP Example:

XXXXXXXT 24LC128I
YYWW 0110
NNN 017

Legend: XX...X Customer specific information*

T Temperature grade (I, E)
Y Year code (last digit of calendar year)
YY Year code (last 2 digits of calendar year)
WW Week code (week of January 1 is week ‘01’)
NNN Alphanumeric traceability code
Note:In the event the full Microchip part number cannot be marked on one line, it will be
carried over to the next line thus limiting the number of available characters for customer
specific information.

*Standard device marking consists of Microchip part number, year code, week code, and traceability code. For
device marking beyond this, certain price adders apply. Please check with your Microchip Sales Office.

TSSOP Package Codes MSOP Package Codes

Part No. STD Pb-free STD Pb-free
24AA128 4AC G4AC 4A128 G4AC
24LC128 4LC G4LC 4L128 G4LC
24FC128 4FC G4FC 4F128 G4FC

DS21191M-page 12  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
8-Lead Plastic Dual In-line (P) – 300 mil (PDIP)

E1

n 1

A A2

L
c
A1

β B1
p
eB B

Units INCHES* MILLIMETERS

Dimension Limits MIN NOM MAX MIN NOM MAX
Number of Pins n 8 8
Pitch p .100 2.54
Top to Seating Plane A .140 .155 .170 3.56 3.94 4.32
Molded Package Thickness A2 .115 .130 .145 2.92 3.30 3.68
Base to Seating Plane A1 .015 0.38
Shoulder to Shoulder Width E .300 .313 .325 7.62 7.94 8.26
Molded Package Width E1 .240 .250 .260 6.10 6.35 6.60
Overall Length D .360 .373 .385 9.14 9.46 9.78
Tip to Seating Plane L .125 .130 .135 3.18 3.30 3.43
Lead Thickness c .008 .012 .015 0.20 0.29 0.38
Upper Lead Width B1 .045 .058 .070 1.14 1.46 1.78
Lower Lead Width B .014 .018 .022 0.36 0.46 0.56
Overall Row Spacing § eB .310 .370 .430 7.87 9.40 10.92
Mold Draft Angle Top α 5 10 15 5 10 15
Mold Draft Angle Bottom β 5 10 15 5 10 15
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MS-001
Drawing No. C04-018

 2004 Microchip Technology Inc. DS21191M-page 13

24AA128/24LC128/24FC128
8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC)

E1

D
2

B n 1

h α
45°

c
A A2

φ
β L A1

Units INCHES* MILLIMETERS

Dimension Limits MIN NOM MAX MIN NOM MAX
Number of Pins n 8 8
Pitch p .050 1.27
Overall Height A .053 .061 .069 1.35 1.55 1.75
Molded Package Thickness A2 .052 .056 .061 1.32 1.42 1.55
Standoff § A1 .004 .007 .010 0.10 0.18 0.25
Overall Width E .228 .237 .244 5.79 6.02 6.20
Molded Package Width E1 .146 .154 .157 3.71 3.91 3.99
Overall Length D .189 .193 .197 4.80 4.90 5.00
Chamfer Distance h .010 .015 .020 0.25 0.38 0.51
Foot Length L .019 .025 .030 0.48 0.62 0.76
Foot Angle φ 0 4 8 0 4 8
Lead Thickness c .008 .009 .010 0.20 0.23 0.25
Lead Width B .013 .017 .020 0.33 0.42 0.51
Mold Draft Angle Top α 0 12 15 0 12 15
Mold Draft Angle Bottom β 0 12 15 0 12 15
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MS-012
Drawing No. C04-057

DS21191M-page 14  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
8-Lead Plastic Small Outline (SM) – Medium, 208 mil (SOIC)

E1

D
2

n 1
B

c
A A2

A1
β L

Units INCHES* MILLIMETERS

Dimension Limits MIN NOM MAX MIN NOM MAX
Number of Pins n 8 8
Pitch p .050 1.27
Overall Height A .070 .075 .080 1.78 1.97 2.03
Molded Package Thickness A2 .069 .074 .078 1.75 1.88 1.98
Standoff § A1 .002 .005 .010 0.05 0.13 0.25
Overall Width E .300 .313 .325 7.62 7.95 8.26
Molded Package Width E1 .201 .208 .212 5.11 5.28 5.38
Overall Length D .202 .205 .210 5.13 5.21 5.33
Foot Length L .020 .025 .030 0.51 0.64 0.76
Foot Angle φ 0 4 8 0 4 8
Lead Thickness c .008 .009 .010 0.20 0.23 0.25
Lead Width B .014 .017 .020 0.36 0.43 0.51
Mold Draft Angle Top α 0 12 15 0 12 15
Mold Draft Angle Bottom β 0 12 15 0 12 15
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
Drawing No. C04-056

 2004 Microchip Technology Inc. DS21191M-page 15

24AA128/24LC128/24FC128
8-Lead Plastic Thin Shrink Small Outline (ST) – 4.4 mm (TSSOP)

E1

D
2

1
n
B

α
A

φ A1 A2

β
L

Units INCHES MILLIMETERS*

Dimension Limits MIN NOM MAX MIN NOM MAX
Number of Pins n 8 8
Pitch p .026 0.65
Overall Height A .043 1.10
Molded Package Thickness A2 .033 .035 .037 0.85 0.90 0.95
Standoff § A1 .002 .004 .006 0.05 0.10 0.15
Overall Width E .246 .251 .256 6.25 6.38 6.50
Molded Package Width E1 .169 .173 .177 4.30 4.40 4.50
Molded Package Length D .114 .118 .122 2.90 3.00 3.10
Foot Length L .020 .024 .028 0.50 0.60 0.70
Foot Angle φ 0 4 8 0 4 8
Lead Thickness c .004 .006 .008 0.09 0.15 0.20
Lead Width B .007 .010 .012 0.19 0.25 0.30
Mold Draft Angle Top α 0 5 10 0 5 10
Mold Draft Angle Bottom β 0 5 10 0 5 10
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.005” (0.127mm) per side.
JEDEC Equivalent: MO-153
Drawing No. C04-086

DS21191M-page 16  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
14-Lead Plastic Thin Shrink Small Outline (ST) – 4.4 mm (TSSOP)

E1

2
n 1
B

α
A

β A1 A2
L

Units INCHES MILLIMETERS*

Dimension Limits MIN NOM MAX MIN NOM MAX
Number of Pins n 14 14
Pitch p .026 0.65
Overall Height A .043 1.10
Molded Package Thickness A2 .033 .035 .037 0.85 0.90 0.95
Standoff § A1 .002 .004 .006 0.05 0.10 0.15
Overall Width E .246 .251 .256 6.25 6.38 6.50
Molded Package Width E1 .169 .173 .177 4.30 4.40 4.50
Molded Package Length D .193 .197 .201 4.90 5.00 5.10
Foot Length L .020 .024 .028 0.50 0.60 0.70
Foot Angle φ 0 4 8 0 4 8
Lead Thickness c .004 .006 .008 0.09 0.15 0.20
Lead Width B .007 .010 .012 0.19 0.25 0.30
Mold Draft Angle Top α 0 5 10 0 5 10
Mold Draft Angle Bottom β 0 5 10 0 5 10
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.005” (0.127mm) per side.
JEDEC Equivalent: MO-153
Drawing No. C04-087

 2004 Microchip Technology Inc. DS21191M-page 17

24AA128/24LC128/24FC128
8-Lead Plastic Micro Small Outline Package (MS) (MSOP)

E1

D
2
B
n 1

A A2
c
φ
A1

(F) L
β

Units INCHES MILLIMETERS*

Dimension Limits MIN NOM MAX MIN NOM MAX
Number of Pins n 8 8
Pitch p .026 BSC 0.65 BSC
Overall Height A - - .043 - - 1.10
Molded Package Thickness A2 .030 .033 .037 0.75 0.85 0.95
Standoff A1 .000 - .006 0.00 - 0.15
Overall Width E .193 TYP. 4.90 BSC
Molded Package Width E1 .118 BSC 3.00 BSC
Overall Length D .118 BSC 3.00 BSC
Foot Length L .016 .024 .031 0.40 0.60 0.80
Footprint (Reference) F .037 REF 0.95 REF
Foot Angle φ 0° - 8° 0° - 8°
Lead Thickness c .003 .006 .009 0.08 - 0.23
Lead Width B .009 .012 .016 0.22 - 0.40
Mold Draft Angle Top α 5° - 15° 5° - 15°
Mold Draft Angle Bottom β 5° - 15° 5° - 15°
*Controlling Parameter
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not
exceed .010" (0.254mm) per side.
JEDEC Equivalent: MO-187
Drawing No. C04-111

DS21191M-page 18  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
8-Lead Plastic Dual Flat No Lead Package (MF) 6x5 mm Body (DFN-S)

E
B p
E1
n
L

D1 D D2

PIN 1
EXPOSED
ID
METAL
1 2
PADS
E2
TOP VIEW
BOTTOM VIEW

A2
A3

A1

Units INCHES MILLIMETERS*

Dimension Limits MIN NOM MAX MIN NOM MAX
Number of Pins n 8 8
Pitch p .050 BSC 1.27 BSC
Overall Height A .033 .039 0.85 1.00
Molded Package Thickness A2 .026 .031 0.65 0.80
Standoff A1 .000 .0004 .002 0.00 0.01 0.05
Base Thickness A3 .008 REF. 0.20 REF.
Overall Length E .194 BSC 4.92 BSC
Molded Package Length E1 .184 BSC 4.67 BSC
Exposed Pad Length E2 .152 .158 .163 3.85 4.00 4.15
Overall Width D .236 BSC 5.99 BSC
Molded Package Width D1 .226 BSC 5.74 BSC
Exposed Pad Width D2 .085 .091 .097 2.16 2.31 2.46
Lead Width B .014 .016 .019 0.35 0.40 0.47
Lead Length L .020 .024 .030 0.50 0.60 0.75
Tie Bar Width R .014 .356
Mold Draft Angle Top α 12 12
*Controlling Parameter
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side.
JEDEC equivalent: pending
Drawing No. C04-113

 2004 Microchip Technology Inc. DS21191M-page 19

24AA128/24LC128/24FC128
APPENDIX A: REVISION HISTORY
Revision L
Corrections to Section 1.0, Electrical Characteristics.
Revision M
Added 1.8V 400 kHz option for 24FC128.

DS21191M-page 20  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
ON-LINE SUPPORT SYSTEMS INFORMATION AND
Microchip provides on-line support on the Microchip UPGRADE HOT LINE
World Wide Web site. The Systems Information and Upgrade Line provides
The web site is used by Microchip as a means to make system users a listing of the latest versions of all of
files and information easily available to customers. To Microchip's development systems software products.
view the site, the user must have access to the Internet Plus, this line provides information on how customers
and a web browser, such as Netscape® or Microsoft® can receive the most current upgrade kits. The Hot Line
Internet Explorer. Files are also available for FTP Numbers are:
download from our FTP site. 1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
Connecting to the Microchip Internet
Web Site 042003
The Microchip web site is available at the following
URL:
www.microchip.com
The file transfer site is available by using an FTP
service to connect to:
ftp://ftp.microchip.com
The web site and file transfer site provide a variety of
services. Users may download files for the latest
Development Tools, Data Sheets, Application Notes,
User's Guides, Articles and Sample Programs. A vari-
ety of Microchip specific business information is also
available, including listings of Microchip sales offices,
distributors and factory representatives. Other data
available for consideration is:
• Latest Microchip Press Releases
• Technical Support Section with Frequently Asked
Questions
• Design Tips
• Device Errata
• Job Postings
• Microchip Consultant Program Member Listing
• Links to other useful web sites related to
Microchip Products
• Conferences for products, Development Systems,
technical information and more
• Listing of seminars and events

 2004 Microchip Technology Inc. DS21191M-page 21

24AA128/24LC128/24FC128
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-
uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation
can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.
Please list the following information, and use this outline to provide us with your comments about this document.

To: Technical Publications Manager Total Pages Sent ________

RE: Reader Response

From: Name
Company
Address
City / State / ZIP / Country
Telephone: (_______) _________ - _________ FAX: (______) _________ - _________
Application (optional):
Would you like a reply? Y N

Device: 24AA128/24LC128/24FC128 Literature Number: DS21191M

Questions:

1. What are the best features of this document?

2. How does this document meet your hardware and software development needs?

3. Do you find the organization of this document easy to follow? If not, why?

4. What additions to the document do you think would enhance the structure and subject?

5. What deletions from the document could be made without affecting the overall usefulness?

6. Is there any incorrect or misleading information (what and where)?

7. How would you improve this document?

DS21191M-page 22  2004 Microchip Technology Inc.

 24AA128/24LC128/24FC128
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO. X /XX X Examples:

a) 24AA128-I/P: Industrial Temp.,
Device Temperature Package Lead
1.8V, PDIP package.
Range Finish
b) 24AA128T-I/SN: Tape and Reel,
Industrial Temp., 1.8V, SOIC
Device: 24AA128: 128 Kbit 1.8V I2C Serial package.
EEPROM
c) 24AA128-I/ST: Industrial Temp.,
24AA128T: 128 Kbit 1.8V I2C Serial
1.8V, TSSOP package.
EEPROM (Tape and Reel)
24LC128: 128 Kbit 2.5V I2C Serial d) 24AA128-I/MS: Industrial Temp.,
EEPROM 1.8V, MSOP package.
24LC128T: 128 Kbit 2.5V I2C Serial e) 24LC128-E/P: Extended Temp.,
EEPROM (Tape and Reel) 2.5V, PDIP package.
24FC128: 128 Kbit High Speed I2C Serial f) 24LC128-I/SN: Industrial Temp.,
EEPROM 2.5V, SOIC package.
24FC128T: 128 Kbit High Speed I2C Serial
g) 24LC128T-I/SN: Tape and Reel,
EEPROM (Tape and Reel)
Industrial Temp., 2.5V, SOIC
package.
Temperature I = -40°C to +85°C h) 24LC128-I/MS: Industrial Temp.,
Range: E = -40°C to +125°C 2.5V, MSOP package.
i) 24FC128-I/P: Industrial Temp.,
Package: P = Plastic DIP (300 mil body), 8-lead 1.8V, High Speed, PDIP package.
SN = Plastic SOIC (150 mil body), 8-lead j) 24FC128-I/SN: Industrial Temp.,
SM = Plastic SOIC (208 mil body), 8-lead 1.8V, High Speed, SOIC package.
ST = Plastic TSSOP (4.4 mm), 8-lead
k) 24FC128T-I/SN: Tape and Reel,
ST14 = Plastic TSSOP (4.4 mm), 14-lead
Industrial Temp., 1.8V, High Speed,
MF = Dual, Flat, No Lead (DFN)(6x5 mm
SOIC package
body), 8-lead
MS = Plastic Micro Small Outline (MSOP), l) 24LC128T-I/STG: Industrial Temp.,
8-lead 2.5V, TSSOP package, Tape & Reel,
Pb-free
Lead Finish Blank= Standard 63%/37% Sn/Pb
G = Pb-free (Pure Matte Sn) m) 24LC128-I/PG: Industrial Temp.,
2.5V, PDIP package, Pb-free

Sales and Support

Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:

1. Your local Microchip sales office

2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

New Customer Notification System

Register on our web site (www.microchip.com/cn) to receive the most current information on our products.

 2004 Microchip Technology Inc. DS21191M-page23

24AA128/24LC128/24FC128
NOTES:

DS21191M-page24  2004 Microchip Technology Inc.

Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device Trademarks

applications and the like is intended through suggestion only
The Microchip name and logo, the Microchip logo, Accuron,
and may be superseded by updates. It is your responsibility to
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,
ensure that your application meets with your specifications.
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
No representation or warranty is given and no liability is
registered trademarks of Microchip Technology Incorporated
assumed by Microchip Technology Incorporated with respect
in the U.S.A. and other countries.
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, SEEVAL,
use or otherwise. Use of Microchip’s products as critical SmartSensor and The Embedded Control Solutions Company
components in life support systems is not authorized except are registered trademarks of Microchip Technology
with express written approval by Microchip. No licenses are Incorporated in the U.S.A.
conveyed, implicitly or otherwise, under any intellectual Analog-for-the-Digital Age, Application Maestro, dsPICDEM,
property rights. dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Migratable Memory, MPASM,
MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net,
PICLAB, PICtail, PowerCal, PowerInfo, PowerMate,
PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial,
SmartTel and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2004, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.

Microchip received ISO/TS-16949:2002 quality system certification for

its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.

 2004 Microchip Technology Inc. DS21191M-page 25

 WORLDWIDE SALES AND SERVICE
AMERICAS China - Beijing Korea
Unit 706B 168-1, Youngbo Bldg. 3 Floor
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6285 Northam Drive, Suite 108 Tel: 39-0331-742611
Bangalore, 560 025, India Fax: 39-0331-466781
Mississauga, Ontario L4V 1X5, Canada Tel: 91-80-22290061 Fax: 91-80-22290062
Tel: 905-673-0699 Netherlands
Japan
Fax: 905-673-6509 Waegenburghtplein 4
Benex S-1 6F NL-5152 JR, Drunen, Netherlands
3-18-20, Shinyokohama Tel: 31-416-690399
ASIA/PACIFIC Kohoku-Ku, Yokohama-shi Fax: 31-416-690340
Australia Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122 United Kingdom
Suite 22, 41 Rawson Street 505 Eskdale Road
Epping 2121, NSW Winnersh Triangle
Australia Wokingham
Tel: 61-2-9868-6733 Berkshire, England RG41 5TU
Fax: 61-2-9868-6755 Tel: 44-118-921-5869
Fax: 44-118-921-5820

05/28/04

DS21191M-page 26  2004 Microchip Technology Inc.