®

AS4LC2M8S1

AS4LC1M16S1

5/21/01; v.1.1

Alliance Semiconductor

P. 23 of 29

Self refresh waveform

Power down mode waveform

(CL = 3)

Enter power down mode by pulling CKE low.

All input/output buffers (except CKE buffer) are turned off in power down mode.

When CKE goes high, command input must be equal to no operation at next CLK rising edge.

CLK

CS

RAS

CAS

WE

A11

A0–A10

DQM

CKE

DQ

Precharge both banks

Self refresh entry

Self refresh exit

Self refresh

Arbitrary cycle

cycle

Clock stable before

self refresh exit

Power down mode

Active standby

CLK

CS

RAS

CAS

WE

A11

A10

A0–A9

DQM

CKE

DQ

Bank activate

Power down mode entry

Power down mode exit

NOP

Power down mode entry

Power down mode

Precharge standby

NOP

Power down mode exit

Bank activate

Data burst