Datasheet

CK#
T1 T3 T4 Ta0 Ta7 Ta8 Ta9 Ta10T0
CK
t
CKSRE
Tb0
t
XS_FAST
t
CAL
DES DES SRE DESDES
VALID
CS#
CKE
CMD
w/o CS#
ADDR
NOTES:
1. t
CAL
= 3nCK, t
CPDED
= 4nCK, t
CKSRE
= 8nCK, t
CKSRX
= 8nCK, t
XS_FAST
= t
RFC4(min)
+ 10ns
2. CS# = H, ACT# = Don't Care, RAS#/A16 = Don't Care, CAS#/A15 = Don't Care, WE#/A14 = Don't Care
3. Only MRS (limited to those described in the Self-Refresh Operation section). ZQCS or ZQCL command allowed.
t
CKSRX
t
CPDED
DES
t
CAL
T7 T8 T11 Tb1 Tb3
DES DES SRX
2
DES VALID
3
VALID
DON'T CARETIME BREAK
Figure 21. Self Refresh Entry/Exit Timing with CAL
T1 T2 T3 T4 T5 T6 T7 T8 T9T0 T10
t
CAL
Don't CareTIME BREAK
DESDES DES VALID DES DES DES DES DES DES
VALID
CK#
CK
CKE
CS#
NOTE 1. t
CAL
= 3nCK, t
CPDED
= 4nCK, t
PD
= 6nCK, t
XP
= 5nCK
T11 T12 T14 T15 T16 T17 T18
DES DES DES DES DES DES VALID
CMD
w/o CS#
ADDR
VALID
t
CPDED
t
PD
t
XP
t
CAL
Figure 22. Active Power Down Entry and Exit Timing with CAL
T1 T2 T3 T4 T5 T6 T7 T8 T9T0 T10
t
CAL
Don't CareTIME BREAK
DESDES DES REF DES DES DES DES DES DES
VALID
CK#
CK
CKE
CS#
NOTE 1. t
CAL
= 3nCK, t
REFPDEN
= 1nCK, t
CPDED
= 4nCK, t
PD
= 6nCK, t
XP
= 5nCK
T11 T12 T14 T15 T16 T17 T18
DES DES DES DES DES DES VALID
CMD
w/o CS#
ADDR
VALID
t
CPDED
t
PD
t
XP
t
CAL
t
REFPDEN
Figure 23. Refresh Command to Power Down Entry with CAL
AS4C256M16D4
Confidential
- 38 of 201 -
Rev.1.0 Aug.2019