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74F649

Octal transceiver/register, non-inverting (open-collector)

Philips Electronics 

Philips Semiconductors

Octal transceivers/registers (open-collector)

Product specification

74F647/74F649

AC WAVEFORMS (Continued)

For all waveforms, VM = 1.5V

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

An or Bn

Bn or An

VM

tPLH

VM

VM

SBA or SAB

tPHL

VM

An or Bn

SF00396

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

SBA to An or SAB to Bn

An or Bn

VM

VM

ts(H) th(H)

VM VM

ts(L) th(H)

CPBA

or

VM

CPAB

VM

SF01165

Waveform 4. Data Setup and Hold Times

TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS

18

16

14

tPLH

12

10

PROPAGATION

DELAY (ns)

tPHL

8

6

4

2

0

0

100

200

300

400

500

600

LOAD RESISTOR (W)

SF01208

NOTE:

When using open-collector part, the value of the pull-up resistor greatly affects the value of the tPLH. For example, changing the pull-up resistor

value from 500W to 100W will improve the tPLH up to 50% with only slight increase in the tPHL. However, if the pull-up resistor is changed, the

user must take certain that the total IOL current through the resistor and the total IIL’s of the receivers do not exceed the IOL maximum

specification.

1992 Feb 28

7

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