Datasheet

Power-Down Clarifications
When CKE is registered low for power-down entry, t
PD (MIN)
must be satisfied before CKE can be registered
high for power-down exit. The minimum value of parameter t
PD (MIN)
is equal to the minimum value of parameter
t
CKE (MIN)
as shown in the timing parameters table. A detailed example of Case 1 is shown below.
CK#
T1 Ta0 Tb0 Tb1 Tc0T0
CK
CKE
DESVALID DES
DES
t
IH
t
PD
t
CPDED
DON'T CARETIME BREAK
DES
VALID
ADDR
CMD
Tc1 Tb0
DES DES
t
IS
t
IH
t
IS
t
CPDED
t
IS
t
PD
t
CKE
Enter
Power-Down
Mode
Exit
Power-Down
Mode
Enter
Power-Down
Mode
Figure 37. Power-Down Entry/Exit Clarification
AS4C256M16D4
Confidential
- 53 of 201 -
Rev.1.0 Aug.2019