hd74hc668 Renesas Electronics Corporation., hd74hc668 Datasheet - Page 4

• Manufacturer Part Number: hd74hc668
• Description: Synchronous Up/down Decade Counter
• Manufacturer: Renesas Electronics Corporation.

HD74HC668, HD74HC669
Timing Chart
HD74HC668
Rev.2.00 Mar 30, 2006 page 4 of 10
Enable P and T
Data
inputs
Ripple
carry
output
Clock
U/D
Load
Q
Q
Q
Q
A
B
C
D
A
B
C
D
Load
7
8
9
Count up
0
1
2
2
Inhibit
2
2
1
0
Count down
9
8
7