EDS1232AATA-75MI View Datasheet(PDF) - Elpida Memory, Inc

Part Name

Description

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EDS1232AATA-75MI

128M bits SDRAM WTR (Wide Temperature Range)

Elpida Memory, Inc 

EDS1232AATA-MI

Power-up sequence

Power-up sequence

The SDRAM should be goes on the following sequence with power up.

The CLK, CKE, /CS, DQM and DQ pins keep low till power stabilizes.

The CLK pin is stabilized within 100 µs after power stabilizes before the following initialization sequence.

The CKE and DQM is driven to high between power stabilizes and the initialization sequence.

This SDRAM has VDD clamp diodes for CLK, CKE, address, /RAS, /CAS, /WE, /CS, DQM and DQ pins. If these

pins go high before power up, the large current flows from these pins to VDD through the diodes.

Initialization sequence

EWhen 200 µs or more has past after the above power-up sequence, all banks must be precharged using the

precharge command (PALL). After tRP delay, set 8 or more auto refresh commands (REF). Set the mode register

set command (MRS) to initialize the mode register. We recommend that by keeping DQM and CKE to High, the

output buffer becomes High-Z during Initialization sequence, to avoid DQ bus contention on memory system formed

with a number of device.

O Power up sequence

Initialization sequence

L 100 μs

200 μs

VDD, VDDQ 0 V

CKE, DQM Low

CLK Low

P /CS, DQ Low

Power stabilize

roduct Power-up sequence and Initialization sequence

Data Sheet E0340E30 (Ver. 3.0)

26

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