74ABT834 datasheet(7/7 Pages) PHILIPS

Part #	74ABT834

Description	Octal inverting transceiver with parity generator/checker 3-State

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors Advanced BiCMOS Products

Objective specification

74ABT834

Octal inverting transceiver with parity

generator/checker (3–State)

June 9, 1992

7

TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS

Load resistor (

Ω)

0

2

4

6

8

10

12

14

16

18

0

100

200

300

400

500

600

tPLH

tPHL

NOTE:

When using Open–Collector parts, the value of the pull–up resistor greatly affects the value of the tPLH. For example, changing the

specified pull–up resistor value from 500

Ω to 100Ω will improve the tPLH over 300% with only a slight change in the tPHL. However,

if the value of the pull–up resistor is changed, the user must make certain that the total IOL current through the resistor and the total

IIL’s of the receivers does not exceed the IOL maximum specification.

TEST CIRCUIT AND WAVEFORM

LOAD VALUES

OUTPUT

RX

VX

ERROR

100

Ω VCC

All other

500

Ω 7.0V

PULSE

GENERATOR

RT

VIN

D.U.T

VOUT

CL

RL

VCC

RX

VX

Test Circuit for 3–State Outputs

VM

tW

AMP (V)

NEGATIVE

PULSE

10%

90%

0V

VM

tW

AMP (V)

POSITIVE

PULSE

90%

10%

0V

tTHL (tF)

tTLH (tR)

tTHL (tF)

tTLH (tR)

VM = 1.5V

Input Pulse Definition

DEFINITIONS

RL = Load resistor; see AC CHARACTERISTICS for value.

CL = Load capacitance includes jig and probe capacitance;

see AC CHARACTERISTICS for value.

RT = Termination resistance should be equal to ZOUT of

pulse generators.

INPUT PULSE REQUIREMENTS

FAMILY

Amplitude

Rep. Rate

tW

tR

tF

74ABT

3.0V

1MHz

500ns

2.5ns

SWITCH POSITION

TEST

SWITCH

tPLZ

closed

tPZL

closed

All other

open

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