IS43LR32800G Datasheet, PDF (42/47 Pages) Integrated Silicon Solution, Inc – 2M x 32Bits x 4Banks Mobile DDR SDRAM

IS43LR32800G, IS46LR32800G
Power down
Power down occurs if CKE is set low coincident with Device Deselect or NOP command and when no accesses are in progress. If power
down occurs when all banks are idle, it is Precharge Power Down. If Power down occurs when one or more banks are Active, it is referred to
as Active power down. The device cannot stay in this mode for longer than the refresh requirements of the device, without losing data. The
power down state is exited by setting CKE high while issuing a Device Deselect or NOP command. A valid command can be issued after tXP.
Figure 36 : Power down (Active or Precharge)
/CLK
CLK
CKE
C ommand
Address
T0
T1
T2
tC K
tCH
tCL
tIS tIH
tIS
tIS tIH
VALID
tIS tIH
VALID
NOP
Ta0
Ta1
Tb0
t XP
NOP
VALID
VALID
DQS, DQ, DM
Must not exceed refresh device limits
Power-down mode entry
Power-down mode exit
Don’t care
Deep Power down
The Deep Power-Down (DPD) mode enables very low standby currents. All internal voltage generators inside the Mobile DDR are stopped
and all memory data is lost in this mode. All the information in the Mode Register and the Extended Mode Register is lost. Next Figure, DEEP
POWER-DOWN COMMAND shows the DEEP POWER-DOWN command All banks must be in idle state with no activity on the data bus prior to
entering the DPD mode. While in this state, CKE must be held in a constant low state. To exit the DPD mode, CKE is taken high after the
clock is stable and NOP command must be maintained for at least 200 us.
Figure 37 : Deep Power down
T0
/CLK
CLK
T1
tIS
T2
Ta 0
tC KE
Ta 1
Ta 2
Tb 0
T=200us
CKE
C ommand
NOP
DPD
NOP
NOP
VALID
Address
VALID
DQS, DQ, DM
Deep Power -down mode
entry
Deep Power-down mode
exit
Don’t care
Rev. A | November 2013
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