N74F38D datasheet(4/8 Pages) PHILIPS

4 / 8 page

Philips Semiconductors

Product specification

74F38

Quad 2-input NAND buffer (open collector)

October 4, 1990

AC ELECTRICAL CHARACTERISTICS

LIMITS

TEST

VCC = +5.0V

VCC = +5.0V ± 10%

SYMBOL

PARAMETER

TEST

CONDITION

Tamb = +25°C

Tamb = 0°C to +70°C

Tamb = –40°C to +85°C

UNIT

CONDITION

CL = 50pF, RL = 500Ω

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

tPHL

Propagation delay

Dna, Dnb to Qn

Waveform 1

7.5

1.5

10.0

3.0

12.5

5.0

7.5

1.5

13.0

5.5

7.5

1.5

14.5

6.0

AC WAVEFORMS

Dna, Dnb

tPHL

tPLH

SF00005

Waveform 1.

Propagation delay for inverting outputs

NOTE:

For all waveforms, VM = 1.5V.

TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS

100

200

300

400

500

600

tPHL

tPLH

Load resistor

(Ω)

SF00044

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 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 IIL’s of the receivers does

not exceed the IOL minimum specification.

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