N74F3038D 查看數據表（PDF） - Philips Electronics

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N74F3038D

Quad 2-input NAND 30 Ω line driver (open collector)

Philips Electronics 

Philips Semiconductors

Quad 2-input NAND 30Ω line driver (open collector)

Product specification

74F3038

TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS

9

tPLH

8

7

6

5

4

3

tPHL

2

1

0

0

100

200

300

400

500

600

LOAD RESISTOR (Ω)

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 500Ω to 100Ω will improve the tPLH up to 50% with only a slight increase 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

IILs of the receivers does not exceed the IOL maximum specification.

SF01361

TEST CIRCUIT AND WAVEFORMS

VCC

7.0V

90%

tw

90%

AMP (V)

VIN

VOUT

RL

PULSE

D.U.T.

GENERATOR

NEGATIVE

PULSE

VM

10%

VM

10%

0V

tTHL (tf )

tTLH (tr )

RT

CL RL

Test Circuit for Open Collector Outputs

POSITIVE

PULSE

tTLH (tr )

90%

VM

tTHL (tf )

90%

VM

AMP (V)

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.

10%

tw

10%

0V

Input Pulse Definition

INPUT PULSE REQUIREMENTS

family

amplitude VM rep. rate

tw

tTLH

tTHL

74F

3.0V 1.5V 1MHz 500ns 2.5ns 2.5ns

SF00027

1998 May 21

5

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