Philips Semiconductors

Product data

74ABT245

Octal transceiver with direction pin (3-State)

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

1.0

2.2

2.9

4.1

4.2

1.0

1.0

4.6

4.6

ns

Output enable time

to HIGH and LOW level

2

1.3

2.3

3.0

4.0

4.8

5.8

1.3

2.3

5.3

6.3

ns

Output disable time

from HIGH and LOW Level

2

1.0

1.0

4.7

4.1

6.2

5.8

1.0

1.0

7.2

6.3

ns

AC WAVEFORMS

An or Bn

INPUT

VM

VM

Bn or An

OUTPUT

VM

VM

tPLH

tPHL

SA00124

Waveform 1. Waveforms showing the input to output

propagation delays

nOE INPUT

OUTPUT

OUTPUT

VM

VM

tPZH

tPHZ

VOH

VM

VM

VOL

tPZL

tPLZ

3.5V

0V

VOL + 0.3V

VOH – 0.3V

SA00024

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