74F269 데이터 시트보기 (PDF) - Philips Electronics

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74F269

8-bit bidirectional binary counter

Philips Electronics 

Philips Semiconductors

8–bit bidirectional binary counter

Product specification

74F269

AC WAVEFORMS

For all waveforms, VM = 1.5V.

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

1/fMAX

CP

VM

VM

VM

tW(H)

tPLH

tW(L)

tPHL

VM

Qn

tPHL

VM

tPLH

TC

VM

VM

SF00791A

Waveform 1. Propagation Delay, Clock Input to Output,

Clock Pulse Width, and Maximum Clock Frequency

CET

TC

VM

VM

tPHL

tPLH

VM

VM

SF00792

Waveform 2. Propagation Delay,

CET Input to Terminal Count Output

U/D

TC

VM

VM

tPHL

tPLH

VM

VM

SF00793

Waveform 3. Propagation Delay, Up/Down Count Control Input

to Terminal Count Output

CET

CEP

CP

VM

VM

ts(L)

th(L)

VM

VM

VM

ts(H)

th(H)

VM

Pn

VM

VM

ts

th

PE

VM

VM

ts(L)

th = 0

VM

VM

ts(H)

th = 0

CP

VM

VM

SF00844

Waveform 4. Parallel Data and Parallel Enable

Setup and Hold Times

U/D

VM

VM

ts(L)

th

CP

VM

VM

VM

ts(H)

th

VM

Qn

COUNT

NO CHANGE

SF00842

Waveform 5. Count Enables Setup and Hold Times

Qn

COUNT DOWN

COUNT UP

SF00839

Waveform 6. Up/Down Count Control Setup and Hold Times

1996 Jan 05

8

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