Philips Semiconductors

Product specification

74F647/74F649

Octal transceivers/registers (open-collector)

1992 Feb 28

7

AC WAVEFORMS (Continued)

The shaded areas indicate when the input is permitted to change for predictable output performance.

VM

VM

VM

VM

tPHL

tPLH

An or Bn

Bn or An

SBA or SAB

An or Bn

SF00396

Waveform 3. Propagation Delay, An to Bn or Bn to An and

SBA to An or SAB to Bn

VM

VM

VM

VM

VM

VM

ts(H)

ts(L)

th(H)

th(H)

CPBA

or

CPAB

An or Bn

SF01165

Waveform 4. Data Setup and Hold Times

TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS

0

100

200

300

400

500

600

18

16

14

12

10

8

6

4

2

0

LOAD RESISTOR (

W)

PROPAGATION

DELAY (ns)

SF01208

NOTE:

value from 500

specification.