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| HD74HC668 Datasheet, PDF (8/11 Pages) Hitachi Semiconductor – Synchronous UP/Down Decade,4-bit binary Counter | |||
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HD74HC668, HD74HC669
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 â¦
Input
Pulse Generator
Zout = 50 â¦
VCC
Output
U/D
QA
Clock
A
QB
B
C
QC
D
Enable P QD
Load
Ripple
Enable T Carry
Output
Output
Output
Output
CL = 50 pF
CL = 50 pF
CL = 50 pF
CL = 50 pF
CL = 50 pF
Note : 1. CL includes probe and jig capacitance.
Rev.2.00 Mar 30, 2006 page 8 of 10
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