Rev 1.0 / Jul. 2005

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256Mbit (16Mx16bit) Mobile SDR Memory

HY5S5B6ELF(P)-xE Series

Special Operation for Low Power Consumption

Deep Power Down Mode

Deep Power Down Mode is an operating mode to achieve maximum power reduction by cutting the power of the whole

memory array of the devices.

Data will not be retained once the device enters Deep Power Down Mode.

Full initialization is required when the device exits from Deep Power Down Mode.

Truth Table

Deep Power Down Mode Entry

The Deep Power Down Mode is entered by having CS and WE held low with RAS and CAS high at the rising edge of

the clock, while CKE is low. The following diagram illustrates deep power down mode entry.

Current State

Command

CS

RAS

CAS

WE

Idle

Deep Power Down Entry

H

L

L

H

H

L

Deep Power Down

Deep Power Down Exit

L

H

XXXX

CLK

CKE

CS

RAS

CAS

WE

Precharge

if needed

Deep Power Down Entry