HD74HCT620 Datasheet, PDF (2/9 Pages) Hitachi Semiconductor – Octal Bus Transceivers (with inverted 3-state outputs)/

HD74HCT620/HD74HCT623
Function Table
Enable Input
GBA
L
H
H
L
GAB
L
H
L
H
Operation
HD74HCT620
B data to A bus
A data to B bus
Isolation
B data to A bus,
A data to B bus
HD74HCT623
B data to A bus
A data to B bus
Isolation
B data to A bus,
A data to B bus
Pin Arrangement
Enable GAB 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
(Top view)
20 VCC
19 Enable GBA
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
2