HD74HCT74A 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD74HCT74A

Dual D–type Positive Edge–triggered Flip Flops with Clear and Preset

Hitachi -> Renesas Electronics 

HD74HCT74A

Test Circuit

1) fmax , t PLH ,t PHL (CLK → Q, Q)

Input

Pulse Generator

Zout = 50 Ω

Input

VCC VCC

PR

D

Q

Pulse Generator

Zout = 50 Ω

CLK

Q

CLR

2) tPLH ,t PHL (CLR or PR → Q, Q)

Input

Pulse Generator

Zout = 50 Ω

VCC

PR

D

Q

Input

Pulse Generator

Zout = 50 Ω

CLK

Q

CLR

Output Q

CL

Output Q

CL

Output Q

CL

Output Q

CL

Notes: 1. C L includes probe and jig capacitance.

2. Test is put into the each flip flops.

6

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