Philips Semiconductors

Product specification

74ABT640

Octal transceiver with direction pin, inverting

(3-State)

1998 Jan 16

5

AC CHARACTERISTICS

LIMITS

SYMBOL

PARAMETER

WAVEFORM

UNIT

Min

Typ

Max

Min

Max

Propagation delay

An to Bn or Bn to An

1

1.0

1.5

2.8

3.1

4.2

4.3

1.0

1.5

4.9

4.9

ns

Output enable time

to High and Low level

2

1.5

1.3

3.6

3.2

4.9

5.9

1.5

1.3

5.8

7.3

ns

Output disable time

from High and Low Level

2

2.5

2.0

5.2

4.1

6.5

5.3

2.5

2.0

6.8

5.5

ns

AC WAVEFORMS

An or Bn

INPUT

Bn or An

OUTPUT

SA00192

Waveform 1. Waveforms Showing the Input to Output

Propagation Delays

OE

INPUT

3.5V

0V

An or Bn

OUTPUT

An or Bn

OUTPUT

SA00207

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