Philips Semiconductors

Product specification

74ABT540

Octal buffer, inverting (3-State)

1998 Jan 16

5

AC CHARACTERISTICS

LIMITS

SYMBOL

PARAMETER

WAVEFORM

UNIT

Min

Typ

Max

Min

Max

Propagation delay

An to Yn

1

1.0

1.0

2.9

3.1

4.1

4.3

1.0

1.0

4.8

4.8

ns

Output enable time

to High and Low level

2

1.1

1.1

4.1

4.6

4.9

5.8

1.1

1.1

5.9

6.4

ns

Output disable time

from High and Low level

2

1.5

1.2

3.6

2.9

6.8

5.7

1.5

1.2

7.3

6.2

ns

AC WAVEFORMS

An INPUT

VM

VM

Yn OUTPUT

VM

VM

tPHL

tPLH

SA00200

Waveform 1. Waveforms Showing the Input (An) to Output (Yn)

Propagation Delays

OEn

INPUT

VM

VM

tPZH

tPHZ

Yn

OUTPUT

VOH

VM

VM

Yn

OUTPUT

VOL

tPZL

tPLZ

3.5V

0V

VOL + 0.3V

VOH – 0.3V

SA00201

Waveform 2. Waveforms Showing the 3-State Output Enable

and Disable Times

TEST CIRCUIT AND WAVEFORMS

500

Ω

Load Circuit

DEFINITIONS

Load capacitance includes jig and probe capacitance;

see AC CHARACTERISTICS for value.

TEST

S1

open

7 V

open

SA00012

500

Ω

From Output

Under Test

S1

7 V

Open

GND