?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 (V
DD
)
Power supply input. See Electrical Specifications.
2.3
SMBus/I
2
C Serial Clock (SCLK)
Input. SMBus/I
2
C 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/
I
2
C 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
3
5
V
DD
Power
Power Supply Input
4
4
SCLK
Input
SMBus/I
2
C Serial Clock
5
2
SDA
Bidirectional
SMBus/I
2
C Serial Data
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