Philips Semiconductors

Product specification

74F821/822/823/824/825/826

Bus interface registers

1996 Jan 05

13

AC WAVEFORMS

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

tPHL

CP

VM

VM

VM

tw(H)

1/fmax

VM

VM

tPHL

tw(L)

tPLH

Qn

VM

VM

Qn

tPLH

SF00506

Waveform 1.

Propagation delay for clock input to output,

clock pulse width, and maximum clock frequency

VM

VM

VM

trec

tPHL

MR

CP

Qn, Qn

VM

tw(L)

SF00507

Waveform 2.

Master reset pulse width, master reset to output

delay and master reset to clock recovery time

VM

VM

VM

VM

VM

VM

tsu(L)

th(L)

tsu(H)

th(H)

Dn, CE

CP

SF00508

Waveform 3.

Data setup time and hold times

VM

VM

VM

tPHZ

tPZH

OEn

VOH -0.3V

0V

Qn, Qn

SF00509

Waveform 4.

3-State output enable time to high level and

output disable time from high level

VM

VM

VM

tPLZ

tPZL

VOL +0.3V

3.5V

OEn

Qn, Qn

SF00510

Waveform 5.

3-State output enable time to low level and

output disable time from low level