SDRAM
AS4SD4M16
Austin Semiconductor, Inc.
SELF REFRESH MODE1
T
T
T
t
T
T
T
t
CK
CL
t
CLK
CKE
t
CH
t
CKS
RAS
t
t
t
CKS
CKH
CKS
t
t
CMS
CMH
AUTO
REFRESH
AUTO
REFRESH
NOP
NOP
COMMAND PRECHARGE
DQM /
DQML,
DQMH
A0-A9, A11
ALL BANKS
A10
SINGLE BANK
t
t
AS
AH
BANK(S)
BA0, BA1
High-Z
DQ
t
t
RP
XSR
Exit self refresh mode
(Restart refresh time base)
Precharge all
active banks
Enter self refresh mode
Don’t Care
Undefined
CLK stable prior to exiting
self refresh mode
TIMING PARAMETERS
-8
-10
-8
-10
MIN
1
MAX
MIN
1
MAX
SYMBOL*
tAH
UNITS
ns
MIN
2
MAX
MIN
3
MAX
SYMBOL*
tCKS
UNITS
ns
tAS
2
3
3
4
ns
ns
ns
ns
ns
ns
tCMH
tCMS
tRAS
tRP
1
1
ns
ns
ns
ns
ns
tCH
2
3
tCL
3
4
50
24
80
80,000
60
30
90
80,000
tCK(3)
tCK(2)
tCKH
8
10
15
1
12
1
tXSR
* CAS latency indicated in parentheseses.
NOTE: 1. Self Refresh Mode available on Industrial Temperature Range option only.
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS4SD4M16
Rev. 1.5 10/01
38
AUSTIN [ AUSTIN SEMICONDUCTOR ]
