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HD74HC668 Datasheet, PDF (3/11 Pages) Hitachi Semiconductor – Synchronous UP/Down Decade,4-bit binary Counter
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HD74HC668, HD74HC669
Logic Diagram
HD74HC668
Load
U/D
DA
Enable P
Enable T
DB
DC
VCC
DD
CK
HD74HC669
Load
U/D
DA
Enable P
Enable T
DB
DC
DD
VCC
CK
L
TQ
INCK Q
L
TQ
INCK Q
L
TQ
INCK Q
L
TQ
INCK Q
QA
QB
QC
QD
RCO
TQ
IN Q
TQ
IN Q
TQ
IN Q
TQ
IN Q
QA
QB
QC
QD
RCO
Rev.2.00 Mar 30, 2006 page 3 of 10
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