hd74hc668 Renesas Electronics Corporation., hd74hc668 Datasheet - Page 3

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

HD74HC668, HD74HC669
Logic Diagram
HD74HC668
HD74HC669
Rev.2.00 Mar 30, 2006 page 3 of 10
CK
CK
Load
Load
Enable P
Enable T
Enable P
Enable T
U/D
U/D
D
D
A
A
D
D
D
D
D
D
B
C
D
B
C
D
V
CC
V
CC
IN
IN
IN
IN
IN
IN
IN
IN
T
T
T
T
T
T
T
T
CK
CK
CK
CK
L
L
L
L
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
RCO
Q
Q
Q
Q
RCO
A
B
C
D
A
B
C
D