M74HCT646 STMICROELECTRONICS [STMicroelectronics], M74HCT646 Datasheet - Page 4

• Manufacturer Part Number: M74HCT646
• Description: HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV.
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M74HCT646/648
PIN DESCRIPTION
IEC LOGIC SYMBOLS
4/12
20, 19, 18, 17, 16, 15, 14, 13
4, 5, 6, 7, 8, 9, 10, 11
PIN No
21
22
23
12
24
1
2
3
HCT646
SELECT AB
SELECT BA
CLOCK AB
CLOCK BA
SYMBOL
A1 to A8
B1 to B8
GND
DIR
V
G
CC
A to B Clock Input (LOW to HIGH, Edge-Trigged)
Select A to B Source Input
Direction Control Input
A data Inputs/Outputs
B Data Inputs/Outputs
Output Enable Input (Active LOW)
Select B to A Source Input
B to A Clock Input (LOW to HIGH, Edge-Triggered)
Ground (0V)
Positive Supply Voltage
NAME AND FUNCTION
HCT648