Datasheet

Figure 57. Precharge/precharge-all command to power-down entry
CMD
T0 T2 T3 T4 T5 T6 T7 T8 T9 T10T1
PR or PRA
CKE
t
IS
T11
CKE can go to LOW one clock after a Precharge or Precharge all command
Figure 58. MRS/EMRS command to power-down entry
CMD
T0 T2 T3 T4 T5 T6 T7 T8
T9 T10T1
MRS or
EMRS
CKE
t
IS
T11
t
MRD
Figure 59. Asynchronous CKE LOW event
CK#
CK
CKE
t
CK
t
Delay
CKE asynchronously drops LOW
Clocks can be turned off after this point
t
IS
Stable clocks
Figure 60. Clock frequency change in precharge power down mode
CK#
CMD
T0 T2 T4 Tx Tx+1 Ty Ty+1 Ty+2 Ty+3 Ty+4T1 Tz
Frequency Change Occurs here
t
RP
CKE
ODT
CK
NOP NOP NOP NOP
DLL
RESET
NOP Valid
200 Clocks
t
AOFD
Minimum 2 clocks required before
changing frequency
Stable new clock before power
down exit
t
XP
t
IS
t
IS
t
IH
ODT is off during DLL RESET
AS4C64M16D2A-25BIN
AS4C64M16D2A-25BCN
Confidential
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Rev.1.1 October 2017