M2V56S20AKT-5 查看數據表（PDF） - MITSUBISHI ELECTRIC

零件编号

产品描述 (功能)

生产厂家

M2V56S20AKT-5

256M Synchronous DRAM

MITSUBISHI ELECTRIC  

SDRAM (Rev.1.31)

Single Data Rate

Apr. '02

MITSUBISHI LSIs

M2V56S20/ 30/ 40 ATP

M2V56S20/ 30/ 40 AKT

256M Synchronous DRAM

SELF REFRESH

Self-refresh mode is entered by issuing a REFS command (/CS= /RAS= /CAS= L, /WE= H, CKE= L).

Once the self-refresh is initiated, it is maintained as long as CKE is kept low. During the self-refresh mode,

CKE is asynchronous and the only enabled input. All other inputs including CLK are disabled and

ignored, so that power consumption due to synchronous inputs is saved. To exit the self-refresh,

supplying stable CLK inputs, asserting DESEL or NOP command and then asserting CKE=H. After

tRFC from the 1st CLK edge following CKE=H, all banks are in idle state and a new command can be

issued, but DESEL or NOP commands must be asserted till then.

CLK

/CS

/RAS

/CAS

/WE

CKE

A0-12

BA0-1

Self Refresh Entry

Self-Refresh

Stable CLK

NOP

new command

X

00

Self Refresh Exit minimum tRFC

for recovery

MITSUBISHI ELECTRIC

28

Share Link: