HD74HC668RPEL 查看數據表（PDF） - Renesas Electronics

零件编号

产品描述 (功能)

生产厂家

HD74HC668RPEL

Synchronous UP/Down Decade Counter Synchronous Up/Down 4-bit binary Counter

Renesas Electronics 

HD74HC668, HD74HC669

Timing Chart

HD74HC668

Load

A

B

Data

inputs

C

D

Clock

U/D

Enable P and T

QA

QB

QC

QD

Ripple

carry

output

7

8

9

0

12

2

21

0

9

8

7

Load

Count up

Inhibit

Count down

Rev.2.00 Mar 30, 2006 page 4 of 10

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