2002 Microchip Technology Inc. DS21462C-page 1
MTC74
Features
• 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:
- ±2°C (max.) Accuracy from +25°C to +85°C
- ±3°C (max.) Accuracy from 0°C to +125°C
• Supply Voltage of 2.7V to 5.5V
•Low Power:
- 200 µA (typ.) Operating Current
- 5 µA (typ.) Standby Mode Current
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
General Description
The TC74 is a serially accessible, digital temperature
sensor particularly suited for low cost and small form-
factor applications. Temperature data is converted from
the onboard thermal sensing element and made
available as an 8-bit digital word.
Communication with the TC74 is accomplished via a 2-
wire 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 1°C. Conversion rate is a
nominal 8 samples/sec. During normal operation, the
quiescent current is 200 µA (typ). During standby
operation, the quiescent current is 5 µA (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
GND
VDD
NC
SDA
SCLK
TO-220 SOT-23
V
DD
GND
12
NC
5 4
SDA SCLK
TC74
3
12345
TC74
Note: The TO-220 tab is connected
to pin 3 (GND)
Internal Sensor
(Diode)
∆Σ
Modulator
Temperature
Register
Serial Port
Interface
Control
Logic
SDA
SCLK
Tiny Serial Digital Thermal Sensor
TC74
DS21462C-page 2 2002 Microchip Technology Inc.
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
Operating Temperature (TA) ........ -40°C ≤ TA ≤ +125°C
Storage Temperature (TSTG) .............. -65°C to +150°C
Junction Temperature (TJ)................................ +150°C
† Notice: Stresses above those listed under "Maxi-
mum Ratings" may cause permanent damage to the
device. This is a stress rating only and functional oper-
ation 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 rat-
ing conditions for extended periods may affect device
reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and
VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5
Parameters Sym Min Typ Max Units Conditions
Power Supply
Power-on Reset Threshold VPOR 1.2 — 2.2 V VDD Falling Edge or Rising
Edge
Supply Voltage VDD 2.7 — 5.5 V Note 5
Operating Current IDD — 200 350 µA VDD = 5.5V, Note 1
Standby Supply Current IDD-STANDBY — 5.0 10 µA VDD = 3.3V
Serial Port Inactive, Note 4
Temperature-to-Bits Converter
Temperature Accuracy TERR -2.0
-3.0
—
—
—
±2.0
+2.0
+3.0
—
°C +25°C <TA < +85°C
0°C < TA < +125°C
-40°C < TA < 0°C
Conversion Rate CR 4 8 — SPS Note 2
Serial Port Interface
Logic Input High VIH 0.8 x VDD ——V
Logic Input Low VIL — — 0.2 x VDD V
SDA Output Low VOL —
—
—
—
0.4
0.6
V
V
IOL = 3 mA
IOL = 6 mA, Note 3
Input Capacitance SDA, SCLK CIN —5.0 — pF
I/O Leakage ILEAK -1.0 0.1 1.0 µA
Serial Port AC Timing (CLOAD = 80 pF)
SMBus/I2C Clock Frequency fSMB 10 — 100 kHz
Low Clock Period tLOW 4.7 — — µsec 10% to 10%
High Clock Period tHIGH 4.0 — — µsec 90% to 90%
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 1°C/V
of VDD change.
2002 Microchip Technology Inc. DS21462C-page 3
TC74
SMBus/I2C Rise Time
SMBus/I2C Fall Time
tR
tF
—
—
—
—
1000
300
nsec
nsec
10% to 90%
90% to10%
START Condition Setup Time
(for repeated START
Condition)
tSU(START) 4.0 — — µsec 90% SCLK to 10% SDA
START Condition Hold Time tH(START) 4.0 — — µsec
Data In Setup Time tSU-DATA 1000 — — nsec
Data In Hold Time tH-DAT 1250 — — nsec
STOP Condition Setup Time tSU(STOP) 4.0 — — µsec
Bus Free Time Prior to New
Transition
tIDLE 4.7 — — µsec
Power-on Reset Delay tPOR —500 —µsecV
DD ≥ VPOR (Rising Edge)
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and
VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5
Parameters Sym Min Typ Max Units Conditions
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 1°C/V
of VDD change.
TC74
DS21462C-page 4 2002 Microchip Technology Inc.
FIGURE 1-1: Timing Diagrams.
C = LSB of Address Clocked into Slave
tSU(START) tH(START) tSU-DATA tSU(STOP) tIDLE
A = Start Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
ABCDEFG H
IJ
K
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
tLOW tHIGH
I = Acknowledge Clock Pulse
J = Stop Condition
K = New Start Condition
SCLK
SDA
SMBUS Read Timing Diagram
tSU(START) tH(START) tSU-DATA tSU(STOP) tIDLE
A = Start Condition
B = MSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low
ABCDEFG H
IJKL
M
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
J = Acknowledge Clocked into Master
K = Acknowledge Clock Pulse
L = Stop Condition, Data Executed by Slave
M = New Start Condition
tLOW tHIGH
SCLK
SDA
tH-DATA
SMBUS Write Timing Diagram
2002 Microchip Technology Inc. DS21462C-page 5
TC74
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
2.1 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.
Pin No.
(5-Pin
SOT-23)
Pin No.
(5-Pin TO-220) Symbol Type Description
1 1 NC None No Internal Connection
2 3 GND Power System Ground
35V
DD Power Power Supply Input
4 4 SCLK Input SMBus/I2C Serial Clock
5 2 SDA Bidirectional SMBus/I2C Serial Data
TC74
DS21462C-page 6 2002 Microchip Technology Inc.
3.0 DETAILED DESCRIPTION
3.1 Functional Description
The TC74 acquires and converts temperature
information from its onboard solid-state sensor with a
resolution of ±1°C. 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.
3.1.1 STANDBY MODE
The host is allowed, by the TC74, to put it into a low
power (IDD = 5 µA, 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
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 pro-
gramming and interrogating the TC74. The
conventions used in this bus architecture are listed in
Table 3-2.
TABLE 3-2: SERIAL BUS CONVENTIONS
All transfers take place under the control of a host, usu-
ally 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 selec-
tion 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).
SHDN Bit Operating Mode
0Normal
1Standby
Term Explanation
Transmitter The device sending data to the bus.
Receiver The device receiving data from the bus.
Master The device which controls the bus initi-
ating transfers (START), generating the
clock and terminating transfers
(STOP).
Slave The device addressed by the master.
START A unique condition signaling the begin-
ning of a transfer indicated by SDA
falling (high-low) while SCLK is high.
STOP A unique condition signaling the end of
a transfer indicated by SDA rising (low-
high) 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).
2002 Microchip Technology Inc. DS21462C-page 7
TC74
FIGURE 3-1: SMBus/I2C Protocols.
3.3 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 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.
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.
SAddressWR ACKCommandACK Data ACK P
8 Bits7 Bits 8 Bits
Slave Address Command Byte: selects
which register you are
writing to.
Data Byte: data goes
into the register set
by the command byte.
Write Byte Format
Read Byte Format
SAddressWR ACKCommandACK S Address RD ACK Data NACK P
7 Bits 8 Bits 7 Bits 8 Bits
Slave Address Command Byte: selects
which register you are
reading from.
Slave Address: repeated
due to change in data-
flow direction.
Data Byte: reads from
the register set by the
command byte.
Receive Byte Format
S Address RD ACK Data NACK P
7 Bits 8 Bits
Data Byte: reads data from
the register commanded by
the last Read Byte or Write
Byte transmission.
S = START Condition
P = STOP Condition
Shaded = Slave Transmission
TC74
DS21462C-page 8 2002 Microchip Technology Inc.
4.0 REGISTER SET AND
PROGRAMMER’S MODEL
TABLE 4-1: COMMAND BYTE
DESCRIPTION
(SMBUS/I2C READ_BYTE AND
WRITE_BYTE)
TABLE 4-2: CONFIGURATION REGISTER
(CONFIG); 8 BITS, READ/
WRITE)
FIGURE 4-1: DATA_RDY, SHDN
Operation Logic Diagram.
4.1 Temperature Register (TEMP),
8 Bits, READ ONLY
The binary value (2’s complement format) in this regis-
ter represents temperature of the onboard sensor
following a conversion cycle. The registers are
automatically updated in an alternating manner.
TABLE 4-3: TEMPERATURE REGISTER
(TEMP)
In temperature data registers, each unit value repre-
sents one degree (Celsius). The value is in 2’s
complement binary format such that a reading of 0000
0000b corresponds to 0°C. Examples of this
temperature to binary value relationship are shown in
Table 4-4.
TABLE 4-4: TEMPERATURE-TO-DIGITAL
VALUE CONVERSION
(TEMP)
4.2 Register Set Summary
The TC74 register set is summarized in Table 4-5. All
registers are 8 bits wide.
TABLE 4-5: TC74 REGISTER SET
SUMMARY
Command Code Function
RTR 00h Read Temperature (TEMP)
RWCR 01h Read/Write Configuration
(CONFIG)
Bit POR Function Type Operation
D[7] 0 STANDBY
Switch
Read/
Write
1 = standby,
0 = normal
D[6] 0 Data Ready * Read
Only
1 = ready
0 = not ready
D[5]-
D[0]
0 Reserved -
Always
returns zero
when read
N/A N/A
Note 1: *DATA_RDY bit RESET at power-up and
SHDN enable.
V
DD
DATA_RDY
SHDN
t
conv
t
conv
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB X X X X X X LSB
Actual
Temperature
Registered
Temperature
Binary
Hex
+130.00°C +127°C 0111 1111
+127.00°C +127°C 0111 1111
+126.50°C +126°C 0111 1110
+25.25°C +25°C 0001 1001
+0.50°C 0°C 0000 0000
+0.25°C 0°C 0000 0000
0.00°C 0°C 0000 0000
-0.25°C -1°C 1111 1111
-0.50°C -1°C 1111 1111
-0.75°C -1°C 1111 1111
-1.00°C -1°C 1111 1111
-25.00°C -25°C 1110 0111
-25.25°C -26°C 1110 0110
-54.75°C -55°C 1100 1001
-55.00°C -55°C 1100 1001
-65.00°C -65°C 1011 1111
Name Description POR
State Read Write
TEMP Internal Sensor
Temperature (2’s
Complement)
0000
0000b (1) √N/A
CONFIG CONFIG
Register
0000
0000b√√
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. DS21462C-page 9
TC74
5.0 PACKAGING INFORMATION
5.1 SOT23A Package Marking Information
SOT-23 Package Marking Codes
TO-220 Package Marking Information
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
3 = year and quarter code
4 = lot ID number
1 & 2 = part number code + temp. range and voltage
5
1
4
23
5-Pin SOT-23A
1423
Legend: XX...X Customer specific information*
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 lim-
iting the number of available characters for customer specific infor-
mation.
*Standard marking consists of Microchip part number, year code, week code, and traceability code.
TO-220
12345
TC74A0-
3.3VAT
0229123
TC74
DS21462C-page 10 2002 Microchip Technology Inc.
5.2 Taping Forms
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.
Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices
Device
Marking
PIN 1
User Direction of Feed
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)
W
P
2002 Microchip Technology Inc. DS21462C-page 11
TC74
5.3 Package Dimensions
SOT-23A-5
.122 (3.10)
.098 (2.50)
.071 (1.80)
.059 (1.50)
.037 (0.95)
REF.
.020 (0.50)
.012 (0.30)
.118 (3.00)
.010 (2.80)
.006 (0.15)
.000 (0.00)
.057 (1.45)
.035 (0.90) 10° MAX.
.024 (0.60)
.004 (0.10)
.010 (0.25)
.004 (0.09)
.075 (1.90)
REF.
PIN 1
Dimensions: inches (mm)
5-Pin TO-220
.273 (6.93)
.263 (6.68)
.037 (0.95)
.025 (0.64)
.117 (2.97)
.103 (2.62)
.415 (10.54)
.390 (9.91) .156 (3.96)
.140 (3.56)
DIA.
.293 (7.44)
.204 (5.18)
.590 (14.99)
.482 (12.24)
.072 (1.83)
.062 (1.57)
PIN 1
.185 (4.70)
.165 (4.19)
.055 (1.40)
.045 (1.14)
.613 (15.57)
.569 (14.45)
.115 (2.92)
.087 (2.21)
.025 (0.64)
.012 (0.30)
3 - 7.5
5 PLCS.
Dimensions: inches (mm)
TC74
DS21462C-page 12 2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc. DS21462C-page13
TC74
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
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PART NO. XX XX
PackageAddress
Options
Device
Device: TC74: Serial Digital Thermal Sensor
Address Options: A0 = 1001 000
A1 = 1001 001
A2 = 1001 010
A3 = 1001 011
A4 = 1001 100
A5 = 1001 101 *
A6 = 1001 110
A7 = 1001 111
* Default Address
Supply Voltage: 3.3 = Accuracy optimized for 3.3V
5.0 = Accuracy optimized for 5.0V
Operating Temperature: V = -40°C ≤ TA ≤ +125°C
Package: CTTR = SOT-23-5 (Tape and Reel only)
Examples:
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
-XX
Supply
Voltage
X
Operating
Temperature
Device: TC74: Serial Digital Thermal Sensor
Address Options: A0 = 1001 000
A1 = 1001 001
A2 = 1001 010
A3 = 1001 011
A4 = 1001 100
A5 = 1001 101 *
A6 = 1001 110
A7 = 1001 111
* Default Address
Output Voltage: 3.3 = Accuracy optimized for 3.3V
5.0 = Accuracy optimized for 5.0V
Operating Temperature: V = -40°C ≤ TA ≤ +125°C
Package: AT = TO-220-5
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
PART NO. XX XX
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Device
-XX
Supply
Voltage
X
Operating
Temperature
TC74
DS21462C-page 14 2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc. DS21462C - page 15
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 Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, KEELOQ,
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 Company’s 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, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
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 knowl-
edge, 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.
DS21462C-page 16 2002 Microchip Technology Inc.
M
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10/18/02
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