HD74HC668 Datasheet, PDF (7/14 Pages) Hitachi Semiconductor – Synchronous UP/Down Decade,4-bit binary Counter

HD74HC669
Load
A
B
Data
inputs
C
D
Clock
U/D
P and T
QA
QB
QC
QD
Ripple
carry
output
13
14
15
012
HD74HC668/HD74HC669
2
2
1
0
15
14
13
Load
Count up
Inhibit
Count down
7