74F189A データシートの表示（PDF） - Philips Electronics

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74F189A

64-bit TTL bipolar RAM, inverting (3-State)

Philips Electronics 

Philips Semiconductors

64-bit TTL bipolar RAM, inverting (3-State)

Product specification

74F189A

CE

VM

tPZH

Qn

VM

tPZL

NOTE: For all waveforms, VM = 1.5V.

Waveform 2. Read cycle, chip enable access time

CE

Qn

NOTE: For all waveforms, VM = 1.5V.

Waveform 3. Read cycle, chip disable time

AC WAVEFORMS FOR WRITE CYCLE

VM

tPHZ

VM

tPLZ

An

VM

tsu (H or L)

VM

th (H or L)

Dn

VM

tsu ( L)

CE

VM

tsu (H or L)

WE

VM

Qn

NOTE: For all waveforms, VM = 1.5V.

th ( L)

tw ( L)

tPHZ

VM

tPLZ

Hi–Z

VM

th (H or L)

VM

VM

VM

tPZH

VM

tPZL

Waveform 4. Write cycle

SF00304

SF00305

SF00306

1990 Feb 23

6

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