M

TC74

Tiny Serial Digital Thermal Sensor

Features

General Description

Digital Temperature Sensing in SOT-23-5 or

TO-220 Packages
Outputs Temperature as an 8-Bit Digital Word
Simple SMBus/I2C Serial Port Interface
Solid-State Temperature Sensing:
- 2C (max.) Accuracy from +25C to +85C
- 3C (max.) Accuracy from 0C to +125C
Supply Voltage of 2.7V to 5.5V
Low Power:
- 200 A (typ.) Operating Current
- 5 A (typ.) Standby Mode Current

The TC74 is a serially accessible, digital temperature

sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from
the onboard thermal sensing element and made
available as an 8-bit digital word.

Applications
Thermal Protection for Hard Disk Drives
and other PC Peripherals
PC Card Devices for Notebook Computers
Low Cost Thermostat Controls
Power Supplies
Thermistor Replacement

Package Types

Communication with the TC74 is accomplished via a 2wire SMBus/I2C compatible serial port. This bus also
can be used to implement multi-drop/multi-zone
monitoring. The SHDN bit in the CONFIG register can
be used to activate the low power Standby mode.
Temperature resolution is 1C. Conversion rate is a
nominal 8 samples/sec. During normal operation, the
quiescent current is 200 A (typ). During standby
operation, the quiescent current is 5 A (typ).
Small size, low installed cost and ease of use make the
TC74 an ideal choice for implementing thermal
management in a variety of systems.

Functional Block Diagram

Internal Sensor
(Diode)

TO-220

SOT-23
SDA

SCLK

SCLK

Modulator

TC74

Control

Logic

TC74

123 45

NC
SDA
GND
SCLK
VDD

SDA
Serial Port
Interface

NC

GND

VDD

Temperature
Register

Note: The TO-220 tab is connected

to pin 3 (GND)

2002 Microchip Technology Inc.

DS21462C-page 1

TC74
1.0

ELECTRICAL
CHARACTERISTICS

1.1

Absolute Maximum Ratings

Supply Voltage (VDD) ............................................ +6V

Voltage On Any Pin ....... (GND 0.3V) to (VDD + 0.3V)
Current On Any Pin .......................................... 50 mA

Notice: Stresses above those listed under "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 operation listings of this
specification is not implied. Exposure to maximum rating conditions for extended periods may affect device
reliability.

Operating Temperature (TA) ........ -40C TA +125C

Storage Temperature (TSTG) .............. -65C to +150C
Junction Temperature (TJ)................................ +150C

DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and
VDD = 5.0V for TC74AX-5.0VXX, -40C TA 125C. Note 5
Parameters

Sym

Min

Typ

Max

Units

Conditions

Power-on Reset Threshold

VPOR

1.2

2.2

VDD Falling Edge or Rising

Edge

Supply Voltage

VDD

2.7

5.5

Note 5

Operating Current

IDD

200

350

VDD = 5.5V, Note 1

IDD-STANDBY

5.0

10

VDD = 3.3V
Serial Port Inactive, Note 4

TERR

-2.0
-3.0

2.0

+2.0
+3.0

+25C <TA < +85C

0C < TA < +125C
-40C < TA < 0C

CR

SPS

VIH

0.8 x VDD

Logic Input Low

VIL

0.2 x V DD

SDA Output Low

VOL

0.4
0.6

V
V

Power Supply

Standby Supply Current

Temperature-to-Bits Converter
Temperature Accuracy

Conversion Rate

Note 2

Serial Port Interface

Logic Input High

Input Capacitance SDA, SCLK

IOL = 3 mA
IOL = 6 mA, Note 3

CIN

5.0

pF

ILEAK

-1.0

0.1

1.0

fSMB

10

100

kHz

Low Clock Period

tLOW

4.7

sec

10% to 10%

High Clock Period

tHIGH

4.0

sec

90% to 90%

I/O Leakage

Serial Port AC Timing (CLOAD = 80 pF)

SMBus/I2C Clock Frequency

Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may
exceed this specification.
2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec.
3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will
cause self-heating and temperature drift error.
4: SDA and SCLK must be connected to VDD or GND.
5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate
properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated
accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1C/V
of V DD change.

DS21462C-page 2

2002 Microchip Technology Inc.

TC74
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and
VDD = 5.0V for TC74AX-5.0VXX, -40C TA 125C. Note 5
Parameters

Sym

Min

Typ

Max

Units

tR
tF

1000
300

nsec
nsec

10% to 90%
90% to10%

START Condition Setup Time

(for repeated START
Condition)

tSU(START)

4.0

sec

90% SCLK to 10% SDA

START Condition Hold Time

tH(START)

4.0

sec

Data In Setup Time

tSU-DATA

1000

nsec

nsec

SMBus/I C Rise Time

SMBus/I2C Fall Time

tH-DAT

1250

STOP Condition Setup Time

tSU(STOP)

4.0

sec

Bus Free Time Prior to New

Transition

tIDLE

4.7

sec

Power-on Reset Delay

tPOR

500

sec

Data In Hold Time

Conditions

VDD VPOR (Rising Edge)

Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may
exceed this specification.
2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec.
3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will
cause self-heating and temperature drift error.
4: SDA and SCLK must be connected to VDD or GND.
5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate
properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated
accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1C/V
of V DD change.

2002 Microchip Technology Inc.

DS21462C-page 3

TC74
SMBUS Read Timing Diagram
A

B
tLOW tHIGH

E F

SCLK
SDA

tSU(START) tH(START)

tSU-DATA

tSU(STOP)
E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master
G = MSB of Data Clocked into Master
H = LSB of Data Clocked into Master

A = Start Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave

tIDLE

I = Acknowledge Clock Pulse

J = Stop Condition
K = New Start Condition

SMBUS Write Timing Diagram

A

B
tLOW tHIGH

E F

I J

SCLK
SDA

tSU(START) tH(START)

tSU-DATA

A = Start Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low

FIGURE 1-1:

DS21462C-page 4

tH-DATA

F = Acknowledge Bit Clocked into Master

G = MSB of Data Clocked into Slave
H = LSB of Data Clocked into Slave
I = Slave Pulls SDA Line Low

tSU(STOP) tIDLE
J = Acknowledge Clocked into Master
K = Acknowledge Clock Pulse
L = Stop Condition, Data Executed by Slave
M = New Start Condition

Timing Diagrams.

2002 Microchip Technology Inc.

TC74
2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

2.1

PIN FUNCTION TABLE

Pin No.
(5-Pin
SOT-23)

Pin No.
(5-Pin TO-220)

Symbol

Type

Description

NC

None

No Internal Connection

GND

Power

System Ground

VDD

Power

Power Supply Input

SCLK

Input

SMBus/I2C Serial Clock

SDA

Bidirectional

SMBus/I2C Serial Data

Ground (GND)

Input. Ground return for all TC74 functions.

2.2

Power Supply Input (VDD)

Power supply input. See Electrical Specifications.

2.3

SMBus/I2C Serial Clock (SCLK)

Input. SMBus/I2C serial clock. Clocks data into and out

of the TC74. See System Management Bus
Specification, Rev. 1.0, for timing diagrams.

2.4

Serial Data (SDA)

Bidirectional. Serial data is transferred on the SMBus/

I2C in both directions using this pin. See System
Management Bus Specification, Rev. 1.0 for timing
diagrams.

2002 Microchip Technology Inc.

DS21462C-page 5

TC74
3.0

DETAILED DESCRIPTION

3.1

Functional Description

TABLE 3-2:
Term
Transmitter

SERIAL BUS CONVENTIONS

Explanation
The device sending data to the bus.

The TC74 acquires and converts temperature

information from its onboard solid-state sensor with a
resolution of 1C. It stores the data in an internal
register which is then read through the serial port. The
system interface is a slave SMBus/I2C port, through
which temperature data can be read at any time. Eight
SMBus/I2C addresses are programmable for the TC74,
which allows for a multi-sensor configuration. Also,
there is low power Standby mode when temperature
acquisition is suspended.

Receiver

The device receiving data from the bus.

Master

The device which controls the bus initiating transfers (START), generating the
clock and terminating transfers
(STOP).

Slave

The device addressed by the master.

START

A unique condition signaling the beginning of a transfer indicated by SDA

falling (high-low) while SCLK is high.

3.1.1

STOP

A unique condition signaling the end of

a transfer indicated by SDA rising (lowhigh) while SCLK is high.

ACK

A Receiver acknowledges the receipt

of each byte with this unique condition.
The Receiver drives SDA low during
SCLK high of the ACK clock-pulse. The
Master provides the clock pulse for the
ACK cycle.

Busy

Communication is not possible

because the bus is in use.

NOT Busy

When the bus is idle, both SDA and

SCLK will remain high.

Data Valid

The state of SDA must remain stable

during the high period of SCLK in order
for a data bit to be considered valid.
SDA only changes state while SCLK is
low during normal data transfers (see
START and STOP conditions).

STANDBY MODE

The host is allowed, by the TC74, to put it into a low

power (IDD = 5 A, typical) Standby mode. In this
mode, the A/D converter is halted and the temperature
data registers are frozen. The SMBus/I2C port, though,
operates normally. Standby mode is enabled by setting
the SHDN bit in the CONFIG register. Table 3-1
summarizes this operation.

TABLE 3-1:

STANDBY MODE OPERATION

SHDN Bit

Operating Mode

Normal

Standby

3.1.2

SMBUS/I2C SLAVE ADDRESS

The TC74 is internally programmed to have a default

SMBus/I2C address value of 1001 101b. Seven other
addresses are available by custom order (contact
Microchip Technology Inc.

3.2

Serial Port Operation

The Serial Clock input (SCLK) and bidirectional data

port (SDA) form a 2-wire bidirectional serial port for programming and interrogating the TC74. The
conventions used in this bus architecture are listed in
Table 3-2.

DS21462C-page 6

All transfers take place under the control of a host, usually a CPU or microcontroller, acting as the Master. This
host provides the clock signal for all transfers. The
TC74 always operates as a Slave. The serial protocol
is illustrated in Figure 3-1. All data transfers have two
phases and all bytes are transferred MSB first.
Accesses are initiated by a START condition, followed
by a device address byte and one or more data bytes.
The device address byte includes a Read/Write selection bit. Each access must be terminated by a STOP
condition. A convention called Acknowledge (ACK)
confirms receipt of each byte. Note that SDA can
change only during periods when SCLK is low (SDA
changes while SCLK is high are reserved for START
and STOP conditions).

2002 Microchip Technology Inc.

TC74
Write Byte Format
S

Address

WR

ACK

Command

7 Bits

ACK

Data

8 Bits

Slave Address

ACK

8 Bits

Command Byte: selects

which register you are
writing to.

Data Byte: data goes

into the register set
by the command byte.

Read Byte Format

S

Address

WR

ACK

Command

7 Bits

ACK

Address

8 Bits

Slave Address

RD

ACK

7 Bits

Command Byte: selects

which register you are
reading from.

Data

NACK

8 Bits

Slave Address: repeated

due to change in dataflow direction.

Data Byte: reads from

the register set by the
command byte.

Receive Byte Format

S

Address

RD

ACK

7 Bits
S = START Condition
P = STOP Condition
Shaded = Slave Transmission

FIGURE 3-1:

3.3

Data

NACK

Data Byte: reads data from

the register commanded by
the last Read Byte or Write
Byte transmission.

SMBus/I2C Protocols.

START Condition (S)

The TC74 continuously monitors the SDA and SCLK

lines for a START condition (a high-to-low transition of
SDA while SCLK is high) and will not respond until this
condition is met.

3.4

Address Byte

Immediately following the START condition, the host

must transmit the address byte to the TC74. The states
of A2, A1 and A0 determine the SMBus/I2C address for
the TC74. The 7-bit address transmitted in the serial bit
stream must match for the TC74 to respond with an
Acknowledge (indicating the TC74 is on the bus and
ready to accept data). The 8-bit in the address byte is
a Read/Write bit. This bit is a 1 for a read operation or
0 for a write operation. During the first phase of any
transfer, this bit will be set = 0, indicating that the
command byte is being written.

3.5

8 Bits

3.6

Data Byte

After a successful ACK of the address byte, the host

must transmit the data byte to be written, or clock-in the
data to be read (see the appropriate timing diagrams).
ACK will be generated upon a successful write of a
data byte into the TC74.

3.7

STOP Condition (P)

Communications must be terminated by a STOP

condition (a low-to-high transition of SDA while SCLK
is high). The STOP condition must be communicated
by the transmitter to the TC74. Refer to Figure 1-1,
Timing Diagrams, for serial bus timing.

Acknowledge (ACK)

Acknowledge (ACK) provides a positive handshake

between the host and the TC74. The host releases
SDA after transmitting 8 bits. The host then generates
a ninth clock cycle to allow the TC74 to pull the SDA
line low. This action acknowledges that the TC74
successfully received the previous 8 bits of data or
address.

2002 Microchip Technology Inc.

DS21462C-page 7

TC74
4.0

REGISTER SET AND

PROGRAMMERS MODEL

TABLE 4-1:

COMMAND BYTE
DESCRIPTION
(SMBUS/I2C READ_BYTE AND
WRITE_BYTE)

TABLE 4-3:

TEMPERATURE REGISTER
(TEMP)

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

MSB

LSB

In temperature data registers, each unit value repre-

Command

Code

RTR

00h

Read Temperature (TEMP)

sents one degree (Celsius). The value is in 2s

complement binary format such that a reading of 0000
0000b corresponds to 0C. Examples of this
temperature to binary value relationship are shown in
Table 4-4.

RWCR

01h

Read/Write Configuration
(CONFIG)

TABLE 4-4:

TABLE 4-2:

Bit

POR

D[7]

D[6]

D[5]D[0]

Function

CONFIGURATION REGISTER
(CONFIG); 8 BITS, READ/
WRITE)

Actual
Temperature

Registered
Temperature

Binary
Hex

Operation

+130.00C

+127C

0111 1111

STANDBY
Switch

Read/ 1 = standby,
Write 0 = normal

+127.00C

+127C

0111 1111

Data Ready *

Read 1 = ready
Only 0 = not ready

+126.50C

+126C

0111 1110

+25.25C

+25C

0001 1001

+0.50C

0C

0000 0000

+0.25C

0C

0000 0000

0.00C

0C

0000 0000

-0.25C

-1C

1111 1111

-0.50C

-1C

1111 1111

-0.75C

-1C

1111 1111

-1.00C

-1C

1111 1111

-25.00C

-25C

1110 0111

-25.25C

-26C

1110 0110

-54.75C

-55C

1100 1001

-55.00C

-55C

1100 1001

-65.00C

-65C

1011 1111

Function

Reserved Always
returns zero
when read

Type

N/A

N/A

Note 1: *DATA_RDY bit RESET at power-up and

SHDN enable.

VDD

DATA_RDY

4.2

tconv

tconv

FIGURE 4-1:
DATA_RDY, SHDN
Operation Logic Diagram.

Temperature Register (TEMP),

8 Bits, READ ONLY

The binary value (2s complement format) in this register represents temperature of the onboard sensor
following a conversion cycle. The registers are
automatically updated in an alternating manner.

DS21462C-page 8

Register Set Summary

The TC74 register set is summarized in Table 4-5. All

registers are 8 bits wide.

SHDN

4.1

TEMPERATURE-TO-DIGITAL
VALUE CONVERSION
(TEMP)

TABLE 4-5:
Name
TEMP

CONFIG

TC74 REGISTER SET

SUMMARY
Description

POR
State

0000
Internal Sensor
Temperature (2s 0000b (1)
Complement)
CONFIG
Register

0000
0000b

Read Write

N/A

Note 1: The TEMP register will be immediately

updated by the A/D converter after the
DATA_RDY Bit goes high.

2002 Microchip Technology Inc.

TC74
5.0

PACKAGING INFORMATION

5.1

SOT23A Package Marking Information

5-Pin SOT-23A
5

1 & 2 = part number code + temp. range and voltage

3 = year and quarter code

1 2 3 4
1

4 = lot ID number
3

SOT-23 Package Marking Codes

SOT-23 (V)

Address

Code

SOT-23 (V)

Address

Code

TC74A0-3.3VCT

1001 000

V0

TC74A0-5.0VCT

1001 000

U0

TC74A1-3.3VCT

1001 001

V1

TC74A1-5.0VCT

1001 001

U1

TC74A2-3.3VCT

1001 010

V2

TC74A2-5.0VCT

1001 010

U2

TC74A3-3.3VCT

1001 011

V3

TC74A3-5.0VCT

1001 011

U3

TC74A4-3.3VCT

1001 100

V4

TC74A4-5.0VCT

1001 100

U4

TC74A5-3.3VCT

1001 101*

V5

TC74A5-5.0VCT

1001 101*

U5

TC74A6-3.3VCT

1001 110

V6

TC74A6-5.0VCT

1001 110

U6

TC74A7-3.3VCT

1001 111

V7

TC74A7-5.0VCT

1001 111

U7

Note:

* Default Address

TO-220 Package Marking Information

TO-220
Legend: XX...X
YY
WW
NNN

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.

TC74A03.3VAT
0229123

1
*

Customer specific information*

Year code (last 2 digits of calendar year)
Week code (week of January 1 is week 01)
Alphanumeric traceability code

Standard marking consists of Microchip part number, year code, week code, and traceability code.

2002 Microchip Technology Inc.

DS21462C-page 9

TC74
5.2

Taping Forms
Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices
User Direction of Feed
Device
Marking
W

PIN 1

P
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)

Carrier Tape, Number of Components Per Reel and Reel Size:

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

5-Pin SOT-23A

8 mm

4 mm

3000

7 in.

DS21462C-page 10

2002 Microchip Technology Inc.

TC74
5.3

Package Dimensions
SOT-23A-5
.075 (1.90)
REF.

.122 (3.10)
.098 (2.50)

.071 (1.80)
.059 (1.50)

.020 (0.50)
.012 (0.30)
PIN 1

.037 (0.95)
REF.
.118 (3.00)
.010 (2.80)

.057 (1.45)
.035 (0.90)

.010 (0.25)
.004 (0.09)

10 MAX.
.006 (0.15)
.000 (0.00)

.024 (0.60)
.004 (0.10)
Dimensions: inches (mm)

5-Pin TO-220
.185 (4.70)
.165 (4.19)
.117 (2.97)
.103 (2.62)

.415 (10.54)
.390 (9.91)

.156 (3.96)
.140 (3.56)
DIA.

.055 (1.40)
.045 (1.14)

.293 (7.44)
.204 (5.18)
3 - 7.5
5 PLCS.

.613 (15.57)
.569 (14.45)

.037 (0.95)
.025 (0.64)

.590 (14.99)
.482 (12.24)

.025 (0.64)
.012 (0.30)
.072 (1.83)
.062 (1.57)

PIN 1
.273 (6.93)
.263 (6.68)

.115 (2.92)
.087 (2.21)

Dimensions: inches (mm)

2002 Microchip Technology Inc.

DS21462C-page 11

TC74
NOTES:

DS21462C-page 12

2002 Microchip Technology Inc.

TC74
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.
Device

XX

-XX

XX

Address Supply
Operating
Package
Options Voltage Temperature

Device:

TC74:

Address Options:

A0
A1
A2
A3
A4
A5
A6
A7

Serial Digital Thermal Sensor

=
=
=
=
=
=
=
=

1001
1001
1001
1001
1001
1001
1001
1001

000
001
010
011
100
101 *
110
111

* Default Address
Supply Voltage:

3.3
5.0

= Accuracy optimized for 3.3V

= Accuracy optimized for 5.0V

Operating Temperature: V = -40C TA +125C

Package:

a)

TC74A0-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor

b)

TC74A1-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor

c)

TC74A2-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor

d)

TC74A3-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor

e)

TC74A4-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor

f)

TC74A5-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor *

g)

TC74A6-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor

h)

TC74A7-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor

a)

TC74A0-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor

b)

TC74A1-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor

c)

TC74A2-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor

d)

TC74A3-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor

e)

TC74A4-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor

f)

TC74A5-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor *

g)

TC74A6-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor

h)

TC74A7-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor

* Default Address

CTTR = SOT-23-5 (Tape and Reel only)

PART NO.
Device

Examples:

XX

-XX

XX

Address Supply
Operating
Package
Options Voltage Temperature

Device:
Address Options:

TC74:
A0
A1
A2
A3
A4
A5
A6
A7

=
=
=
=
=
=
=
=

Serial Digital Thermal Sensor

1001
1001
1001
1001
1001
1001
1001
1001

000
001
010
011
100
101 *
110
111

* Default Address
Output Voltage:

3.3 = Accuracy optimized for 3.3V

5.0 = Accuracy optimized for 5.0V

Operating Temperature: V = -40C TA +125C

Package:

AT

Examples:
a)

TC74A0-3.3VAT:

TO-220 Serial Digital Thermal Sensor

b)

TC74A1-3.3VAT:

TO-220 Serial Digital Thermal Sensor

c)

TC74A2-3.3VAT:

TO-220 Serial Digital Thermal Sensor

d)

TC74A3-3.3VAT:

TO-220 Serial Digital Thermal Sensor

e)

TC74A4-3.3VAT:

TO-220 Serial Digital Thermal Sensor

f)

TC74A5-3.3VAT:

TO-220 Serial Digital Thermal Sensor *

g)

TC74A6-3.3VAT:

TO-220 Serial Digital Thermal Sensor

h)

TC74A7-3.3VAT:

TO-220 Serial Digital Thermal Sensor

a)

TC74A0-5.0VAT:

TO-220 Serial Digital Thermal Sensor

b)

TC74A1-5.0VAT:

TO-220 Serial Digital Thermal Sensor

c)

TC74A2-5.0VAT:

TO-220 Serial Digital Thermal Sensor

d)

TC74A3-5.0VAT:

TO-220 Serial Digital Thermal Sensor

e)

TC74A4-5.0VAT:

TO-220 Serial Digital Thermal Sensor

f)

TC74A5-5.0VAT:

TO-220 Serial Digital Thermal Sensor *

g)

TC74A6-5.0VAT:

TO-220 Serial Digital Thermal Sensor

h)

TC74A7-5.0VAT:

TO-220 Serial Digital Thermal Sensor

* Default Address

= TO-220-5

Sales and Support

Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
2.
3.

Your local Microchip sales office

The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
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.

2002 Microchip Technology Inc.

DS21462C-page13

TC74
NOTES:

DS21462C-page 14

2002 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.

Information contained in this publication regarding device

applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchips products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property
rights.

Trademarks
The Microchip name and logo, the Microchip logo, K EELOQ,
MPLAB, PIC, PICmicro, PICSTART and PRO MATE are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL
and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
dsPIC, dsPICDEM.net, ECONOMONITOR, FanSense,
FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP,
ICEPIC, microPort, Migratable Memory, MPASM, MPLIB,
MPLINK, MPSIM, PICC, PICDEM, PICDEM.net, rfPIC, Select
Mode and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
Serialized Quick Turn Programming (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.
2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Companys quality system processes and
procedures are QS-9000 compliant for its
PICmicro 8-bit MCUs, KEELOQ code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchips quality system for the
design and manufacture of development
systems is ISO 9001 certified.

2002 Microchip Technology Inc.

DS21462C - page 15

M
WORLDWIDE SALES AND SERVICE
AMERICAS

ASIA/PACIFIC

Corporate Office

Australia

2355 West Chandler Blvd.

Chandler, AZ 85224-6199
Tel: 480-792-7200 Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: http://www.microchip.com

Microchip Technology Australia Pty Ltd

Suite 22, 41 Rawson Street
Epping 2121, NSW
Australia
Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

Rocky Mountain

China - Beijing

2355 West Chandler Blvd.

Chandler, AZ 85224-6199
Tel: 480-792-7966 Fax: 480-792-4338

Atlanta
500 Sugar Mill Road, Suite 200B
Atlanta, GA 30350
Tel: 770-640-0034 Fax: 770-640-0307

Boston
2 Lan Drive, Suite 120
Westford, MA 01886
Tel: 978-692-3848 Fax: 978-692-3821

Chicago
333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: 630-285-0071 Fax: 630-285-0075

Dallas
4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: 972-818-7423 Fax: 972-818-2924

Detroit
Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260

Kokomo
2767 S. Albright Road
Kokomo, Indiana 46902
Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338

San Jose
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955

Toronto
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509

Microchip Technology Consulting (Shanghai)

Co., Ltd., Beijing Liaison Office
Unit 915
Bei Hai Wan Tai Bldg.
No. 6 Chaoyangmen Beidajie
Beijing, 100027, No. China
Tel: 86-10-85282100 Fax: 86-10-85282104

China - Chengdu
Microchip Technology Consulting (Shanghai)
Co., Ltd., Chengdu Liaison Office
Rm. 2401, 24th Floor,
Ming Xing Financial Tower
No. 88 TIDU Street
Chengdu 610016, China
Tel: 86-28-86766200 Fax: 86-28-86766599

China - Fuzhou
Microchip Technology Consulting (Shanghai)
Co., Ltd., Fuzhou Liaison Office
Unit 28F, World Trade Plaza
No. 71 Wusi Road
Fuzhou 350001, China
Tel: 86-591-7503506 Fax: 86-591-7503521

China - Shanghai
Microchip Technology Consulting (Shanghai)
Co., Ltd.
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060

China - Shenzhen
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-82350361 Fax: 86-755-82366086

China - Hong Kong SAR

Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431

India
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, OShaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062

Japan
Microchip Technology Japan K.K.
Benex S-1 6F
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Tel: 82-2-554-7200 Fax: 82-2-558-5934

Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan
Microchip Technology (Barbados) Inc.,
Taiwan Branch
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139

EUROPE
Austria
Microchip Technology Austria GmbH
Durisolstrasse 2
A-4600 Wels
Austria
Tel: 43-7242-2244-399
Fax: 43-7242-2244-393

Denmark
Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45 4420 9895 Fax: 45 4420 9910

France
Microchip Technology SARL
Parc dActivite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany
Microchip Technology GmbH
Steinheilstrasse 10
D-85737 Ismaning, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44

Italy
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883

United Kingdom
Microchip Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
10/18/02

DS21462C-page 16

2002 Microchip Technology Inc.