HD74HC643 Просмотр технического описания (PDF) - Renesas Electronics

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HD74HC643

Octal Bus Transceivers (with 3-state outputs)

Renesas Electronics 

HD74HC640, HD74HC643

HD74HC643

VCC

VCC

G

Input

Pulse Generator

Zout = 50 Ω

Input

Pulse Generator

Zout = 50 Ω

DIR

S1

A1

B1

Output

1 kΩ S2

CL =

50 pF

OPEN

GND

VCC

TEST

tPLH / t PHL

tZH/ t HZ

tZL / t LZ

S2

OPEN

GND

VCC

Notes : 1. CL includes probe and jig capacitance.

2. A2–B2, A3–B3, A4–B4, A5–B5, A6–B6, A7–B7, A8–B8 are identical to above load circuit.

3. S1 is a input / output swich.

Rev.2.00 Mar 30, 2006 page 6 of 10

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