KM44L4341B-GZ 데이터 시트보기 (PDF) - Samsung

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KM44L4341B-GZ

DDR SDRAM Specification Version 0.61

Samsung 

128Mb DDR SDRAM

Target

3.3.14 Power down

The power down mode is entered when CKE is low and exited when CKE is high. Once the power down

mode is initiated, all of the receiver circuits except clock, CKE and DLL circuit tree are gated off to reduce

power consumption. The all banks should be in idle state prior to entering the precharge power down mode

and CKE should be set high at least 1tck+tIS prior to row active command . During power down mode, refresh

operations cannot be performed, therefore the device cannot remain in power down mode longer than the

refresh period(tREF) of the device.

CK

CK

Command

CKE

Precharge

Precharge

power

down

Entry

Active

Active

power

down

Entry

Active

power

down

Exit

Read

Figure 23. Power down entry and exit timing

- 32 of 63 -

REV. 0.61 August 9. '99

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