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EDE2508ACSE-8E-E Datasheet(PDF) 71 Page - Elpida Memory |
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EDE2508ACSE-8E-E Datasheet(HTML) 71 Page - Elpida Memory |
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71 / 81 page  EDE2508ACSE, EDE2516ACSE Preliminary Data Sheet E0948E30 (Ver. 3.0) 71 Power-Down [PDEN] Power-down is synchronously entered when CKE is registered low (along with NOP or deselect command). CKE is not allowed to go low while mode register or extended mode register command time, or read or write operation is in progress. CKE is allowed to go low while any of other operations such as row activation, precharge or auto precharge, or auto-refresh is in progress, but power-down IDD spec will not be applied until finishing those operations. Timing diagrams are shown in the following pages with details for entry into power-down. The DLL should be in a locked state when power-down is entered. Otherwise DLL should be reset after exiting power-down mode for proper read operation. If power-down occurs when all banks are idle, this mode is referred to as precharge power-down; if power-down occurs when there is a row active in any bank, this mode is referred to as active power-down. Entering power-down deactivates the input and output buffers, excluding CK, /CK, ODT and CKE. Also the DLL is disabled upon entering precharge power-down or slow exit active power-down, but the DLL is kept enabled during fast exit active power- down. In power-down mode, CKE low and a stable clock signal must be maintained at the inputs of the DDR2 SDRAM, and ODT should be in a valid state but all other input signals are “Don’t Care”. CKE low must be maintained until tCKE has been satisfied. Power-down duration is limited by 9 times tREFI of the device. The power-down state is synchronously exited when CKE is registered high (along with a NOP or deselect command). CKE high must be maintained until tCKE has been satisfied. A valid, executable command can be applied with power-down exit latency, tXP, tXARD, or tXARDS, after CKE goes high. Power-down exit latency is defined at AC Characteristics table of this data sheet. CK /CK CKE Command VIH or VIL tXP, tXARD, tXARDS Enter power-down mode tCKE min Exit power-down mode tCKE min tIH tIS tIH tIS tIH tIS tIH tIH tIS VALID VALID VALID NOP NOP VALID Power-Down Read to Power-Down Entry CK Command CKE DQ DQS Command CKE DQ DQS /CK AL + CL AL + CL BL=4 BL=8 T0 Tx Tx+2 Tx+3 Tx+4 Tx+5 Tx+6 T1 T2 Tx+1 Tx+7 Tx+8 Tx+9 /DQS /DQS READ out 0 out 1 out 2 out 3 out 0 out 1 out 2 out 3 out 4 out 5 out 6 out 7 VIH VIH CKE should be kept high until the end of burst operation. CKE should be kept high until the end of burst operation. Read operation starts with a read command and T0 Tx Tx+2 Tx+3 Tx+4 Tx+5 Tx+6 T1 T2 Tx+1 Tx+7 Tx+8 Tx+9 READ |
Similar Part No. - EDE2508ACSE-8E-E |
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Similar Description - EDE2508ACSE-8E-E |
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