N74F657D 查看數據表（PDF） - Philips Electronics

零件编号

产品描述 (功能)

生产厂家

N74F657D

Octal transceiver with 8-bit parit generator/checker

Philips Electronics 

Philips Semiconductors

Octal transceiver with 8-bit parity generator/checker

Product specification

74F657

TEST CIRCUIT AND WAVEFORMS

VCC

VIN

PULSE

GENERATOR

VOUT

RL

D.U.T.

RT

CL RL

Test Circuit for Open Collector Outputs

SWITCH POSITION

TEST

tPLZ

tPZL

All other

SWITCH

closed

closed

open

7.0V

90%

NEGATIVE

PULSE

POSITIVE

PULSE

10%

tw

VM

10%

tTHL (tf )

VM

10%

tTLH (tr )

tTLH (tr )

90%

VM

tw

tTHL (tf )

90%

VM

Input Pulse Definition

90%

AMP (V)

0V

AMP (V)

10%

0V

DEFINITIONS:

RL = Load resistor;

see AC electrical characteristics for value.

CL = Load capacitance includes jig and probe capacitance;

see AC electrical characteristics for value.

RT = Termination resistance should be equal to ZOUT of

pulse generators.

INPUT PULSE REQUIREMENTS

family

amplitude VM rep. rate

tw

tTLH

74F

3.0V 1.5V 1MHz 500ns 2.5ns

tTHL

2.5ns

SF00128

90 July 30

8

Share Link: