HD74HC669 查看數據表（PDF） - Renesas Electronics

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产品描述 (功能)

生产厂家

HD74HC669

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

Renesas Electronics 

HD74HC668, HD74HC669

Test Circuit

VCC

Input

Pulse Generator

Zout = 50 Ω

Input

Pulse Generator

Zout = 50 Ω

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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