24AA1025/24LC1025/24FC1025

1024K I2C™ CMOS Serial EEPROM

Device Selection Table: This device is capable of both random and sequential
reads. Reads may be sequential within address
Part VCC Max. Clock Temp.
boundaries 0000h to FFFFh and 10000h to 1FFFFh.
Number Range Frequency Ranges
Functional address lines allow up to four devices on the
24AA1025 1.7-5.5V 400 kHz† I same data bus. This allows for up to 4 Mbits total
24LC1025 2.5-5.5V 400 kHz* I, E system EEPROM memory. This device is available in
the standard 8-pin PDIP, SOIC and SOIJ packages.
24FC1025 1.8-5.5V 1 MHz‡ I
†
100 kHz for VCC < 2.5V Package Type
*100 kHz for VCC < 4.5V, E-temp
‡400 kHz for VCC < 2.5V
PDIP
A0 1 8 VCC

Features: A1 2 7 WP

• Low-Power CMOS Technology: A2* 3 6 SCL

- Read current 450 A, maximum
VSS 4 5 SDA
- Standby current 5 A, maximum
• 2-Wire Serial Interface, I2C™ Compatible
SOIJ/SOIC
• Cascadable up to Four Devices 1 8
A0 VCC
• Schmitt Trigger Inputs for Noise Suppression
A1 2 7 WP
• Output Slope Control to Eliminate Ground Bounce
• 100 kHz and 400 kHz Clock Compatibility A2* 3 6 SCL
• 1 MHz Clock for FC Versions 4 5
VSS SDA
• Page Write Time 3 ms, typical
• Self-Timed Erase/Write Cycle *A2 must be tied to VCC.
• 128-Byte Page Write Buffer
• Hardware Write-Protect Block Diagram
• ESD Protection >400V
• More than 1 Million Erase/Write Cycles A0 A1 WP HV Generator
• Data Retention >200 Years
• Factory Programming Available
I/O Memory
• Packages include 8-lead PDIP, SOIJ and SOIC Control XDEC
EEPROM
Control Array
• Pb-Free and RoHS Compliant Logic Logic

• Temperature Ranges: Page Latches

- Industrial (I): -40C to +85C

I/O
- Automotive (E): -40C to +125C SCL
YDEC
SDA
Description:
The Microchip Technology Inc. 24AA1025/24LC1025/ VCC
24FC1025 (24XX1025*) is a 128K x 8 (1024K bit) VSS Sense AMP
R/W Control
Serial Electrically Erasable PROM, capable of
operation across a broad voltage range (1.7V to 5.5V).
It has been developed for advanced, low-power *24XX1025 is used in this document as a generic part number
applications such as personal communications or data for the 24AA1025/24LC1025/24FC1025 devices.
acquisition. This device has both byte write and page
write capability of up to 128 bytes of data.

 2011 Microchip Technology Inc. DS21941H-page 1

24AA1025/24LC1025/24FC1025
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

Industrial (I): VCC = +1.7V to 5.5V TA = -40°C to +85°C
DC CHARACTERISTICS
Automotive (E): VCC = +2.5V to 5.5V TA = -40°C to +125°C
Param.
Sym. Characteristic Min. Max. Units Conditions
No.
— A1, A2, SCL, SDA and — — —
WP pins:
D1 VIH High-level input voltage 0.7 VCC — V
D2 VIL Low-level input voltage — 0.3 VCC V VCC 2.5V
0.2 VCC V VCC < 2.5V
D3 VHYS Hysteresis of Schmitt 0.05 VCC — V VCC  2.5V (Note)
Trigger inputs
(SDA, SCL pins)
D4 VOL Low-level output voltage — 0.40 V IOL = 3.0 mA @ VCC = 4.5V
IOL = 2.1 mA @ VCC = 2.5V
D5 ILI Input leakage current — ±1 A VIN = VSS or VCC
VIN = VSS or VCC
D6 ILO Output leakage current — ±1 A VOUT = VSS or VCC
D7 CIN, Pin capacitance — 10 pF VCC = 5.0V (Note)
COUT (all inputs/outputs) TA = 25°C, FCLK = 1 MHz
D8 ICC Read Operating current — 450 A VCC = 5.5V, SCL = 400 kHz
ICC Write — 5 mA VCC = 5.5V
D9 ICCS Standby current — 5 A TA = -40°C to +85°C
SCL, SDA, VCC = 5.5V
A1, A2, WP = VSS
Note: This parameter is periodically sampled and not 100% tested.

DS21941H-page 2  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
TABLE 1-2: AC CHARACTERISTICS
Industrial (I): VCC = +1.7V to 5.5V TA = -40°C to +85°C
AC CHARACTERISTICS
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 1.7V  VCC  2.5V
— 400 2.5V  VCC  5.5V
— 400 1.8V  VCC  2.5V (24FC1025 only)
— 1000 2.5V  VCC  5.5V (24FC1025 only)
2 THIGH Clock high time 4000 — ns 1.7V  VCC  2.5V
600 — 2.5V  VCC  5.5V
600 — 1.8V  VCC  2.5V (24FC1025 only)
500 — 2.5V  VCC  5.5V (24FC1025 only)
3 TLOW Clock low time 4700 — ns 1.7V  VCC  2.5V
1300 — 2.5V  VCC  5.5V
1300 — 1.8V  VCC  2.5V (24FC1025 only)
500 — 2.5V  VCC  5.5V (24FC1025 only)
4 TR SDA and SCL rise time — 1000 ns 1.7V  VCC  2.5V
(Note 1) — 300 2.5V  VCC  5.5V
— 300 1.8V  VCC  2.5V (24FC1025 only)
— 300 2.5V  VCC  5.5V (24FC1025 only)
5 TF SDA and SCL fall time — 300 ns All except 24FC1025
(Note 1) — 100 1.8V  VCC  5.5V (24FC1025 only)
6 THD:STA Start condition hold time 4000 — ns 1.7V  VCC  2.5V
600 — 2.5V  VCC  5.5V
600 — 1.8V  VCC  2.5V (24FC1025 only)
250 — 2.5V  VCC  5.5V (24FC1025 only)
7 TSU:STA Start condition setup time 4700 — ns 1.7V  VCC  2.5V
600 — 2.5V  VCC  5.5V
600 — 1.8V  VCC  2.5V (24FC1025 only)
250 — 2.5V  VCC  5.5V (24FC1025 only)
8 THD:DAT Data input hold time 0 — ns (Note 2)
9 TSU:DAT Data input setup time 250 — ns 1.7V  VCC  2.5V
100 — 2.5V  VCC  5.5V
100 — 1.8V  VCC  2.5V (24FC1025 only)
100 — 2.5V  VCC  5.5V (24FC1025 only)
10 TSU:STO Stop condition setup time 4000 — ns 1.7V  VCC  2.5V
600 — 2.5V  VCC  5.5V
600 — 1.8V  VCC  2.5V (24FC1025 only)
250 — 2.5V  VCC  5.5V (24FC1025 only)
11 TSU:WP WP setup time 4000 — ns 1.7V  VCC  2.5V
600 — 2.5V  VCC  5.5V
600 — 1.8V  VCC  2.5V (24FC1025 only)
600 — 2.5V  VCC  5.5V (24FC1025 only)
12 THD:WP WP hold time 4700 — ns 1.7V  VCC  2.5V
1300 — 2.5V  VCC  5.5V
1300 — 1.8V  VCC  2.5V (24FC1025 only)
1300 — 2.5V  VCC  5.5V (24FC1025 only)
13 TAA Output valid from clock — 3500 ns 1.7V  VCC  2.5V
(Note 2) — 900 2.5V  VCC  5.5V
— 900 1.8V  VCC  2.5V (24FC1025 only)
— 400 2.5V  VCC  5.5V (24FC1025 only)
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 established by characterization. For endurance estimates in a specific application,
please consult the Total Endurance™ Model which can be obtained from Microchip’s web site at www.microchip.com.

 2011 Microchip Technology Inc. DS21941H-page 3

24AA1025/24LC1025/24FC1025
Industrial (I): VCC = +1.7V to 5.5V TA = -40°C to +85°C
AC CHARACTERISTICS (Continued)
Automotive (E): VCC = +2.5V to 5.5V TA = -40°C to +125°C
Param.
Sym. Characteristic Min. Max. Units Conditions
No.
14 TBUF Bus free time: Time the bus 4700 — ns 1.7V  VCC  2.5V
must be free before a new 1300 — 2.5V  VCC  5.5V
transmission can start 1300 — 1.8V  VCC  2.5V (24FC1025 only)
500 — 2.5V  VCC  5.5V (24FC1025 only)
15 TSP Input filter spike suppression — 50 ns All except 24FC1025 (Note 1 and Note 3)
(SDA and SCL pins)
16 TWC Write cycle time (byte or page) — 5 ms —
17 Endurance 1,000,000 — cycles Page mode, 25°C, VCC = 5.5V (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 established by characterization. For endurance estimates in a specific application,
please consult the Total Endurance™ Model which can be obtained from Microchip’s web site at www.microchip.com.

FIGURE 1-1: BUS TIMING DATA

5 4
2 D3

SCL
7
3 8 9 10
SDA
6
IN
15

13 14
SDA
OUT

(protected)
WP 11 12
(unprotected)

DS21941H-page 4  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
2.0 PIN DESCRIPTIONS 2.3 Serial Data (SDA)
The descriptions of the pins are listed in Table 2-1. This is a bidirectional pin used to transfer addresses
and data into and data out of the device. It is an open-
TABLE 2-1: PIN FUNCTION TABLE drain terminal, therefore, the SDA bus requires a pull-
up resistor to VCC (typical 10 k for 100 kHz, 2 kfor
Name PDIP SOIJ SOIC Function 400 kHz and 1 MHz).
A0 1 1 1 User Configurable Chip For normal data transfer SDA is allowed to change only
Select during SCL low. Changes during SCL high are
A1 2 2 2 User Configurable Chip reserved for indicating the Start and Stop conditions.
Select
A2 3 3 3 Non-Configurable Chip 2.4 Serial Clock (SCL)
Select.
This pin must be hard- This input is used to synchronize the data transfer from
wired to logical 1 state and to the device.
(VCC). Operation will be
undefined with this pin 2.5 Write-Protect (WP)
left floating or held to
logical 0 (VSS). This pin must be connected to either VSS or VCC. If tied
to VSS, write operations are enabled. If tied to VCC,
VSS 4 4 4 Ground
write operations are inhibited, but read operations are
SDA 5 5 5 Serial Data not affected.
SCL 6 6 6 Serial Clock
WP 7 7 7 Write-Protect Input
VCC 8 8 8 +1.7 to 5.5V (24AA1025)
+2.5 to 5.5V (24LC1025)
+1.8 to 5.5V (24FC1025)

2.1 A0, A1 Chip Address Inputs

The A0 and A1 inputs are used by the 24XX1025 for
multiple device operations. The levels on these inputs
are compared with the corresponding bits in the slave
address. The chip is selected if the comparison is true.
Up to four devices may be connected to the same bus
by using different Chip Select bit combinations. In most
applications, the chip address inputs A0 and A1 are
hard-wired to logic ‘0’ or logic ‘1’. For applications in
which these pins are controlled by a microcontroller or
other programmable device, the chip address pins
must be driven to logic ‘0’ or logic ‘1’ before normal
device operation can proceed.

2.2 A2 Chip Address Input

The A2 input is non-configurable Chip Select. This pin
must be tied to VCC in order for this device to operate.
If left floating or tied to VSS, device operation will be
undefined.

 2011 Microchip Technology Inc. DS21941H-page 5

24AA1025/24LC1025/24FC1025
3.0 FUNCTIONAL DESCRIPTION
The 24XX1025 supports a bidirectional 2-wire bus and
data transmission protocol. A device that sends data
onto the bus is defined as a transmitter and a device
receiving data as a receiver. The bus must be
controlled by a master device which generates the
Serial Clock (SCL), controls the bus access, and
generates the Start and Stop conditions while the
24XX1025 works as a slave. Both master and slave
can operate as a transmitter or receiver, but the master
device determines which mode is activated.

DS21941H-page 6  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
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 24XX1025 does not generate any
4.2 Start Data Transfer (B) Acknowledge bits if an internal program-
ming cycle is in progress, however, the
A high-to-low transition of the SDA line while the clock control byte that is being polled must
(SCL) is high determines a Start condition. All match the control byte used to initiate the
commands must be preceded by a Start condition. write cycle.
A device that acknowledges must pull-down the SDA
4.3 Stop Data Transfer (C) line during the Acknowledge clock pulse in such a way
A low-to-high transition of the SDA line while the clock that the SDA line is stable low during the high period of
(SCL) is high determines a Stop condition. All the acknowledge related clock pulse. Of course, setup
operations must end with a Stop condition. and hold times must be taken into account. During
reads, a master must signal an end of data to the slave
4.4 Data Valid (D) by NOT generating an Acknowledge bit on the last byte
that has been clocked out of the slave. In this case, the
The state of the data line represents valid data when, slave (24XX1025) will leave the data line high to enable
after a Start condition, the data line is stable for the the master to generate the Stop condition.
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

The transmitter must release the SDA line at this The receiver must release the SDA line at this
point allowing the receiver to pull the SDA line low point so the transmitter can continue sending
to acknowledge the previous eight bits of data. data.

 2011 Microchip Technology Inc. DS21941H-page 7

24AA1025/24LC1025/24FC1025
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
Block Chip
24XX1025, this is set as ‘1010’ binary for read and Select Select
write operations. The next bit of the control byte is the Control Code Bits Bits
block select bit (B0). This bit acts as the A16 address
bit for accessing the entire array. The next two bits of S 1 0 1 0 B0 A1 A0 R/W ACK
the control byte are the Chip Select bits (A1, A0). The
Chip Select bits allow the use of up to four 24XX1025
Slave Address
devices on the same bus and are used to select which
device is accessed. The Chip Select bits in the control Start Bit Acknowledge Bit
byte must correspond to the logic levels on the
corresponding A1 and A0 pins for the device to
respond. These bits are in effect the two Most
5.1 Contiguous Addressing Across
Significant bits (MSb) of the word address.
Multiple Devices
The last bit of the control byte defines the operation to
be performed. When set to a one, a read operation is The Chip Select bits A1 and A0 can be used to expand
selected, and when set to a zero, a write operation is the contiguous address space for up to 4 Mbit by add-
selected. The next two bytes received define the ing up to four 24XX1025’s on the same bus. In this
address of the first data byte (Figure 5-2). The upper case, software can use A0 of the control byte as
address bits are transferred first, followed by the Least address bit A16 and A1 as address bit A17. It is not
Significant bits (LSb). possible to sequentially read across device boundar-
ies.
Following the Start condition, the 24XX1025 monitors
the SDA bus checking the device type identifier being Each device has internal addressing boundary
transmitted. Upon receiving a ‘1010’ code and limitations. This divides each part into two segments of
appropriate device select bits, the slave device outputs 512K bits. The block select bit ‘B0’ controls access to
an Acknowledge signal on the SDA line. Depending on each “half”.
the state of the R/W bit, the 24XX1025 will select a read Sequential read operations are limited to 512K blocks.
or write operation. To read through four devices on the same bus, eight
This device has an internal addressing boundary random Read commands must be given.
limitation that is divided into two segments of 512K bits.
Block select bit ‘B0’ to control access to each segment.

FIGURE 5-2: ADDRESS SEQUENCE BIT ASSIGNMENTS

Control Byte Address High Byte Address Low Byte

B A A A A A A A A A A A A
1 0 1 0 1 0 R/W • • • • • •
0 15 14 13 12 11 10 9 8 7 0

Control Block Chip

Code Select Select X = “don’t care” bit
Bit Bits

DS21941H-page 8  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
6.0 WRITE OPERATIONS 6.2 Page Write
The write control byte, word address and the first data
6.1 Byte Write byte are transmitted to the 24XX1025 in the same way
Following the Start condition from the master, the as in a byte write. But instead of generating a Stop
control code (four bits), the block select (one bit), the condition, the master transmits up to 127 additional
Chip Select (two bits), and the R/W bit (which is a logic bytes, which are temporarily stored in the on-chip page
low) are clocked onto the bus by the master transmitter. buffer and will be written into memory after the master
This indicates to the addressed slave receiver that the has transmitted a Stop condition. After receipt of each
address high byte will follow after it has generated an word, the seven lower Address Pointer bits are
Acknowledge bit during the ninth clock cycle. internally incremented by one. If the master should
Therefore, the next byte transmitted by the master is transmit more than 128 bytes prior to generating the
the high-order byte of the word address and will be Stop condition, the address counter will roll over and
written into the Address Pointer of the 24XX1025. The the previously received data will be overwritten. As with
next byte is the Least Significant Address Byte. After the byte write operation, once the Stop condition is
receiving another Acknowledge signal from the received, an internal write cycle will begin (Figure 6-2).
24XX1025, the master device will transmit the data If an attempt is made to write to the array with the WP
word to be written into the addressed memory location. pin held high, the device will acknowledge the
The 24XX1025 acknowledges again and the master command, but no write cycle will occur, no data will be
generates a Stop condition. This initiates the internal written and the device will immediately accept a new
write cycle and during this time, the 24XX1025 will not command.
generate Acknowledge signals as long as the control
byte being polled matches the control byte that was 6.3 Write Protection
used to initiate the write (Figure 6-1). If an attempt is
The WP pin allows the user to write-protect the entire
made to write to the array with the WP pin held high, the
array (00000-1FFFF) when the pin is tied to VCC. If tied
device will acknowledge the command, but no write
to VSS the write protection is disabled. The WP pin is
cycle will occur, no data will be written and the device
sampled at the Stop bit for every Write command
will immediately accept a new command. After a byte
(Figure 1-1). Toggling the WP pin after the Stop bit will
Write command, the internal address counter will point
have no effect on the execution of the write cycle.
to the address location following the one that was just
written. Note: Page write operations are limited to writ-
ing bytes within a single physical page,
regardless of the number of bytes actually
Note: When doing a write of less than 128 bytes
being written. Physical page boundaries
the data in the rest of the page is
start at addresses that are integer
refreshed along with the data bytes being
multiples of the page buffer size (or ‘page
written. This will force the entire page to
size’) and end at addresses that are
endure a write cycle, for this reason
integer multiples of [page size – 1]. If a
endurance is specified per page.
Page Write command attempts to write
across a physical page boundary, the
result is that the data wraps around to the
beginning of the current page (overwriting
data previously stored there), instead of
being written to the next page as might be
expected. It is therefore necessary for the
application software to prevent page write
operations that would attempt to cross a
page boundary.

 2011 Microchip Technology Inc. DS21941H-page 9

24AA1025/24LC1025/24FC1025
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 01 0B AA
010 0 P

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

FIGURE 6-2: PAGE WRITE

S
T S
BUS ACTIVITY A Control Address Address T
MASTER R Byte High Byte Low Byte Data Byte 0 Data Byte 127 O
T P
SDA LINE BAA P
S101 00100
A A A A A
BUS ACTIVITY C C C C C
K K K K K
X = “don’t care” bit

DS21941H-page 10  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
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
command has been issued from the master, the device Send
initiates the internally timed write cycle. ACK polling Write Command
can be initiated immediately. This involves the master
sending a Start condition, followed by the control byte
for a Write command (R/W = 0). If the device is still Send Stop
busy with the write cycle, then no ACK will be returned. Condition to
If no ACK is returned, then the Start bit and control byte Initiate Write Cycle
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 Send Start
for flow diagram.
Note: Care must be taken when polling the
24XX1025. The control byte that was Send Control Byte
used to initiate the write needs to match with R/W = 0
the control byte used for polling.

Did Device No
Acknowledge
(ACK = 0)?
Yes

Next
Operation

 2011 Microchip Technology Inc. DS21941H-page 11

24AA1025/24LC1025/24FC1025
8.0 READ OPERATION 8.2 Random Read
Read operations are initiated in the same way as write Random read operations allow the master to access
operations with the exception that the R/W bit of the any memory location in a random manner. To perform
control byte is set to one. There are three basic types this type of read operation, first the word address must
of read operations: current address read, random read be set. This is done by sending the word address to the
and sequential read. 24XX1025 as part of a write operation (R/W bit set to
0). After the word address is sent, the master
8.1 Current Address Read generates a Start condition following the acknowledge.
This terminates the write operation, but not before the
The 24XX1025 contains an address counter that internal Address Pointer is set. Then, the master issues
maintains the address of the last word accessed, the control byte again, but with the R/W bit set to a one.
internally incremented by one. Therefore, if the The 24XX1025 will then issue an acknowledge and
previous read access was to address n (n is any legal transmit the 8-bit data word. The master will not
address), the next current address read operation acknowledge the transfer, but does generate a Stop
would access data from address n + 1. condition which causes the 24XX1025 to discontinue
Upon receipt of the control byte with R/W bit set to one, transmission (Figure 8-2). After a random Read
the 24XX1025 issues an acknowledge and transmits command, the internal address counter will point to the
the 8-bit data word. The master will not acknowledge address location following the one that was just read.
the transfer, but does generate a Stop condition and the
24XX1025 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 24XX1025 transmits
READ the first data byte, the master issues an acknowledge
S as opposed to the Stop condition used in a random
T S read. This acknowledge directs the 24XX1025 to
BUS ACTIVITY A Control Data T
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 B AA 1 P master, the master will NOT generate an acknowledge,
0 1 0
A N
but will generate a Stop condition. To provide
BUS ACTIVITY C O sequential reads, the 24XX1025 contains an internal
K
A Address Pointer which is incremented by one at the
C completion of each operation. This Address Pointer
K
allows half the memory contents to be serially read
during one operation. Sequential read address
boundaries are 0000h to FFFFh and 10000h to
1FFFFh. The internal Address Pointer will
automatically roll over from address FFFF to address
0000 if the master acknowledges the byte received
from the array address, 1FFFF. The internal address
counter will automatically roll over from address
1FFFFh to address 10000h if the master acknowledges
the byte received from the array address, 1FFFFh.

DS21941H-page 12  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
FIGURE 8-2: RANDOM READ
S S
BUS ACTIVITY T T S
A Control Address Address A Control Data T
MASTER
R Byte High Byte Low Byte R Byte Byte O
T T P
B A A
SDA LINE S 1 0 1 0 0 S 1 0 1 0 B A A1 P
0 1 0 0 1 0
A A A A N
BUS ACTIVITY C C C C O
K K K K A
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

 2011 Microchip Technology Inc. DS21941H-page 13

24AA1025/24LC1025/24FC1025
9.0 PACKAGING INFORMATION

9.1 Package Marking Information

8-Lead PDIP (300 mil) Example:

XXXXXXXX 24LC1025
TXXXXNNN I/P e3 13F
YYWW 0928

8-Lead SOIC (3.90 mm) Example:

XXXXXXXT 24L1025I
XXXXYYWW SN e3 0928
NNN
13F

8-Lead SOIJ (5.28 mm) Example:

XXXXXXXX 24LC1025
TXXXXXXX I/SM e3
YYWWNNN 0928 13F

Legend: XX...X Part number or part number code

T Temperature (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 (2 characters for small packages)
e3 Pb-free JEDEC designator for Matte Tin (Sn)

Note: For very small packages with no room for the Pb-free JEDEC designator
e3 , the marking will only appear on the outer carton or reel label.

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 marking consists of Microchip part number, year code, week code, traceability code (facility
code, mask rev#, and assembly code). For marking beyond this, certain price adders apply. Please
check with your Microchip Sales Office.

DS21941H-page 14  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025


 
  
  
 3
&'
!&" &4# *!(!!&
4%&

&#&
&&255***'

'54

NOTE 1
E1

1 2 3

D
E

A A2

A1 L
c

e
b1 eB
b

6&! 7,8.
'!
9'&! 7 7: ;
7"') 
%! 7 <
&  1,

&
&  = = 

##4 4!!   - 
1!&
&   = =

"# &

"# >#& .  - -

##4>#& .   <
:  9&  -< -? 
&
& 9  - 
9# 4!!  <  
6 9#>#& )  ? 
9
* 9#>#& )  < 
:  
*+ 1 = = -

  !"#$%&" '  ()"&'"!&)
&#*&&&# 
 +%&, & !&
- '!
!#.#

&"#'
#%!

& "!
!
#%!

& "!
!!
&$#/ !#
 '!
#&
  .0
1,21!'!
 
&$& "!
**&
"&&
 !


 

  * ,<1

 2011 Microchip Technology Inc. DS21941H-page 15

24AA1025/24LC1025/24FC1025

Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging

DS21941H-page 16  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025

Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging

 2011 Microchip Technology Inc. DS21941H-page 17

24AA1025/24LC1025/24FC1025


  

!
 ""#$%& !'
 3
&'
!&" &4# *!(!!&
4%&

&#&
&&255***'

'54

DS21941H-page 18  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025

Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging

 2011 Microchip Technology Inc. DS21941H-page 19

24AA1025/24LC1025/24FC1025

Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging

DS21941H-page 20  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025

Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging

 2011 Microchip Technology Inc. DS21941H-page 21

24AA1025/24LC1025/24FC1025
APPENDIX A: REVISION HISTORY

Revision A
Original release.

Revision B
Section 1.0 Electrical Characteristics: revised Ambient
Temperature; Revised Table 1-1; Revised Section 2.1
and Section 2.5.

Revision C
Revised Features, Maximum Read Current and Table
1-1, D9; Revised Table 2-1, VCC; Revised Section 6.3.

Revision D (01/2007)
Revised Device Selection Table; Features Section;
Changed 1.8V to 1.7V; Revised Tables 1-1, 1-2, 2-1;
Revised Product ID System; Replaced Package
Drawings.

Revision E (03/2007)
Replaced Package Drawings (Rev. AM).

Revision F (10/2008)
Corrections on the Device Selection Table; Corrections
on the Description; Corrections on the AC Characteris-
tics table; Corrections on the Pin Function Table;
Corrections on the Product ID System; Updated
Package Drawings.

Revision G (01/2010)
Added 8-Lead SOIC Package.

Revision H (01/2011)
Revised PDIP Package Type Diagram; Revised
Section 1.0 Electrical Characteristics; Revised SOIC
Package Marking Information (3.90mm).

DS21941H-page 22  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
THE MICROCHIP WEB SITE CUSTOMER SUPPORT
Microchip provides online support via our WWW site at Users of Microchip products can receive assistance
www.microchip.com. This web site is used as a means through several channels:
to make files and information easily available to • Distributor or Representative
customers. Accessible by using your favorite Internet
• Local Sales Office
browser, the web site contains the following
information: • Field Application Engineer (FAE)
• Technical Support
• Product Support – Data sheets and errata,
application notes and sample programs, design • Development Systems Information Line
resources, user’s guides and hardware support Customers should contact their distributor,
documents, latest software releases and archived representative or field application engineer (FAE) for
software support. Local sales offices are also available to help
• General Technical Support – Frequently Asked customers. A listing of sales offices and locations is
Questions (FAQ), technical support requests, included in the back of this document.
online discussion groups, Microchip consultant Technical support is available through the web site
program member listing at: http://support.microchip.com
• Business of Microchip – Product selector and
ordering guides, latest Microchip press releases,
listing of seminars and events, listings of
Microchip sales offices, distributors and factory
representatives

CUSTOMER CHANGE NOTIFICATION

SERVICE
Microchip’s customer notification service helps keep
customers current on Microchip products. Subscribers
will receive e-mail notification whenever there are
changes, updates, revisions or errata related to a
specified product family or development tool of interest.
To register, access the Microchip web site at
www.microchip.com. Under “Support”, click on
“Customer Change Notification” and follow the
registration instructions.

 2011 Microchip Technology Inc. DS21941H-page 23

24AA1025/24LC1025/24FC1025
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip
product. 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: 24AA1025/24LC1025/24FC1025 Literature Number: DS21941H

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?

DS21941H-page 24  2011 Microchip Technology Inc.

 24AA1025/24LC1025/24FC1025
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
Examples:
Device Temperature Package a) 24AA1025T-I/SM: Tape and Reel, Industrial
Range Temperature, SOIJ package.
b) 24LC1025-I/P: Industrial Temperature,
PDIP package.
Device: 24AA1025 = 1024K Bit 1.7V I2C CMOS Serial EEPROM c) 24LC1025-E/SM: Extended Temperature,
24AA1025T = 1024K Bit 1.7V I2C CMOS Serial EEPROM SOIJ package.
(Tape and Reel)
24LC1025 = 1024K Bit 2.5V I2C CMOS Serial EEPROM d) 24LC1025T-I/SM: Tape and Reel, Industrial
24LC1025T = 1024K Bit 2.5V I2C CMOS Serial EEPROM Temperature, SOIJ package.
(Tape and Reel) e) 24FC1025-I/SN: Tape and Reel, Industrial
24FC1025 = 1024K Bit 1.8V I2C CMOS Serial EEPROM Temperature, SOIC package.
24FC1025T = 1024K Bit 1.8V I2C CMOS Serial EEPROM
(Tape and Reel)

Temperature I = -40°C to +85°C

Range: E = -40°C to +125°C

Package: P = Plastic DIP (300 mil Body), 8-lead

SM = Plastic SOIJ (5.28 mm Body), 8-lead
SN = Plastic SOIC (3.90 mm Body), 8-lead

 2011 Microchip Technology Inc. DS21941H-page 25

24AA1025/24LC1025/24FC1025
NOTES:

DS21941H-page 26  2011 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 provided only for your convenience
The Microchip name and logo, the Microchip logo, dsPIC,
and may be superseded by updates. It is your responsibility to
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
ensure that your application meets with your specifications.
PIC32 logo, rfPIC and UNI/O are registered trademarks of
MICROCHIP MAKES NO REPRESENTATIONS OR
Microchip Technology Incorporated in the U.S.A. and other
WARRANTIES OF ANY KIND WHETHER EXPRESS OR countries.
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION, FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
INCLUDING BUT NOT LIMITED TO ITS CONDITION, MXDEV, MXLAB, SEEVAL and The Embedded Control
QUALITY, PERFORMANCE, MERCHANTABILITY OR Solutions Company are registered trademarks of Microchip
FITNESS FOR PURPOSE. Microchip disclaims all liability Technology Incorporated in the U.S.A.
arising from this information and its use. Use of Microchip Analog-for-the-Digital Age, Application Maestro, CodeGuard,
devices in life support and/or safety applications is entirely at dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
the buyer’s risk, and the buyer agrees to defend, indemnify and ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
hold harmless Microchip from any and all damages, claims, Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified
suits, or expenses resulting from such use. No licenses are logo, MPLIB, MPLINK, mTouch, Omniscient Code
conveyed, implicitly or otherwise, under any Microchip Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
intellectual property rights. PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance,
TSHARC, UniWinDriver, WiperLock and ZENA 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.
© 2011, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.

ISBN: 978-1-60932-833-7

Microchip received ISO/TS-16949:2002 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, 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.

 2011 Microchip Technology Inc. DS21941H-page 27

 Worldwide Sales and Service
AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE
Corporate Office Asia Pacific Office India - Bangalore Austria - Wels
2355 West Chandler Blvd. Suites 3707-14, 37th Floor Tel: 91-80-3090-4444 Tel: 43-7242-2244-39
Chandler, AZ 85224-6199 Tower 6, The Gateway Fax: 91-80-3090-4123 Fax: 43-7242-2244-393
Tel: 480-792-7200 Harbour City, Kowloon Denmark - Copenhagen
India - New Delhi
Fax: 480-792-7277 Hong Kong Tel: 45-4450-2828
Tel: 91-11-4160-8631
Technical Support: Tel: 852-2401-1200 Fax: 45-4485-2829
Fax: 91-11-4160-8632
http://support.microchip.com Fax: 852-2401-3431
India - Pune France - Paris
Web Address:
Australia - Sydney Tel: 91-20-2566-1512 Tel: 33-1-69-53-63-20
www.microchip.com
Tel: 61-2-9868-6733 Fax: 91-20-2566-1513 Fax: 33-1-69-30-90-79
Atlanta Fax: 61-2-9868-6755
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Tel: 408-961-6444 Tel: 86-29-8833-7252 Tel: 66-2-694-1351
Fax: 408-961-6445 Fax: 86-29-8833-7256 Fax: 66-2-694-1350

Toronto China - Xiamen

Mississauga, Ontario, Tel: 86-592-2388138
Canada Fax: 86-592-2388130
Tel: 905-673-0699 China - Zhuhai
Fax: 905-673-6509 Tel: 86-756-3210040
Fax: 86-756-3210049

08/04/10

DS21941H-page 28  2011 Microchip Technology Inc.