EMD12164P Emlsi Inc., EMD12164P Datasheet - Page 28

• Manufacturer Part Number: EMD12164P
• Description: 512m 32m X 16 Mobile Ddr Sdram
• Manufacturer: Emlsi Inc.

POWER-DOWN
Power-down is entered when CKE is registered LOW. 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, including CK and
CKB. Exiting power-down requires the device to be at the same voltage as when it entered power-down and a stable
clock.
Note: The power-down duration is limited by the refresh requirements of the device.
While in power-down, CKE LOW must be maintained at the inputs of the Mobile DDR SDRAM, while all other input sig-
nals are Don’t Care. The power-down state is synchronously exited when CKE is registered HIGH (in conjunction with
a NOP or DESELECT command). NOPs or DESELECT commands must be maintained on the command bus until t
is satisfied.
Command
CKE = High
Power down
CKB
CK
Precharge
Precharge
power
Entry
down
28
Active
512M: 32M x 16 Mobile DDR SDRAM
Active
power
down
Entry
EMD12164P
Preliminary
t
IS
Active
power
down
Exit
t
XP
Rev 0.0
Read
XP