Nombre de pieza
         Descripción
HD74HC668

 Synchronous UP/Down Decade,4-bit binary Counter ( 14 Page)


HITACHI
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 6 page
background image
HD74HC668/HD74HC669
6
Timing Chart
HD74HC668
78
9
0
1
2
2
1
0
9
8
7
2
2
Load
A
B
C
D
Data
inputs
Clock
QA
QB
QC
QD
Load
Count up
Inhibit
Count down
Ripple
carry
output
Enable
P and T
U/
D
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