EDD2508AKTA-5 datasheet(19/48 Pages) ELPIDA

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EDD2508AKTA-5 Datasheet(PDF) 19 Page - Elpida Memory

Part #	EDD2508AKTA-5

Description	256M bits DDR SDRAM (32M words x 8 bits, DDR400)

Download	48 Pages

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Manufacturer	ELPIDA [Elpida Memory]

Direct Link	http://www.elpida.com/en

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19 / 48 page

EDD2508AKTA-5

Preliminary Data Sheet E0349E60 (Ver. 6.0)

Auto-refresh command [REF]

This command executes auto-refresh. The banks and the ROW addresses to be refreshed are internally determined

by the internal refresh controller. The average refresh cycle is 7.8

µs. The output buffer becomes High-Z after auto-

refresh start. Precharge has been completed automatically after the auto-refresh. The ACT or MRS command can

be issued tRFC after the last auto-refresh command.

Self-refresh entry [SELF]

This command starts self-refresh. The self-refresh operation continues as long as CKE is held Low. During the self-

refresh operation, all ROW addresses are repeated refreshing by the internal refresh controller. A self-refresh is

terminated by a self-refresh exit command.

Power down mode entry [PDEN]

tPDEN (= 1 cycle) after the cycle when [PDEN] is issued. The DDR SDRAM enters into power-down mode. In

power down mode, power consumption is suppressed by deactivating the input initial circuit. Power down mode

continues while CKE is held Low. No internal refresh operation occurs during the power down mode. [PDEN] do not

disable DLL.

Self-refresh exit [SELFX]

This command is executed to exit from self-refresh mode. To issue non-read commands, tSNR has to be satisfied.

((tSNR =)15 cycles for tCK = 5.0 ns after [SELFX]) To issue read command, tSRD has to be satisfied to adjust

DOUT timing by DLL. (200 cycles after [SELFX]) After the exit, input auto-refresh command within 7.8

µs.

Power down exit [PDEX]

The DDR SDRAM can exit from power down mode tPDEX (1 cycle min.) after the cycle when [PDEX] is issued.

Manufacturer	Part #	Datasheet	Description
Elpida Memory	EDD2508AKTA-5-E	551Kb / 48P	256M bits DDR SDRAM (32M words x 8 bits, DDR400)
	EDD2508AKTA-5B-E	551Kb / 48P	256M bits DDR SDRAM (32M words x 8 bits, DDR400)
	EDD2508AKTA-5C-E	551Kb / 48P	256M bits DDR SDRAM (32M words x 8 bits, DDR400)

Manufacturer	Part #	Datasheet	Description
Elpida Memory	EDD2508AKTA-5-E	551Kb / 48P	256M bits DDR SDRAM (32M words x 8 bits, DDR400)
	EDD2516AKTA-5-E	558Kb / 48P	256M bits DDR SDRAM (16M words x16 bits, DDR400)
	EDD2516AKTA-E	564Kb / 49P	256M bits DDR SDRAM (16M words x 16 bits)
	EDD2504AKTA-E	555Kb / 49P	256M bits DDR SDRAM (64M words x 4 bits)
	EDD1216AATA-5	556Kb / 48P	128M bits DDR SDRAM (8M words x 16 bits, DDR400)
	EDD2504AKTA	441Kb / 49P	256M bits DDR SDRAM (64M words x 4 bits)
	EDD2516KCTA-SI	579Kb / 52P	256M bits DDR SDRAM 256M bits DDR SDRAM
	EDS2516ADTA-75	702Kb / 50P	256M bits SDRAM (16M words x 16 bits)
	EDS2516CDTA	703Kb / 50P	256M bits SDRAM (16M words x 16 bits)
	EDS2532AABH-75	577Kb / 48P	256M bits SDRAM (8M words x 32 bits)

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