W9864G2GH Datasheet, PDF (18/46 Pages) Winbond – 512K X 4 BANKS X 32BITS SDRAM

W9864G2GH
AC Characteristics and Operating Condition, continued
PARAMETER
Refresh Time
SYM
tREF
-5
MIN. MAX.
64
-6/-6I
MIN. MAX.
64
Mode Register Set
Cycle Time
tRSC 10
12
Exit self refresh to
tXSR 70
72
Active command
-6C
MIN. MAX.
64
12
72
-7
MIN. MAX.
64
14
75
UNIT
mS
nS
nS
NOTES
Notes:
1.Operation exceeds “Absolute Maximum Ratings” may cause permanent damage to the devices.
2. All voltages are referenced to VSS
3. These parameters depend on the cycle rate and listed values are measured at a cycle rate with the
minimum values of tCK and tRC.
4. These parameters depend on the output loading conditions. Specified values are obtained with
output open.
5. Power up sequence please refer to "Functional Description" section described before.
6. AC Testing Conditions
PARAMETER
Output Reference Level
Output Load
Input Signal Levels (VIH/VIL)
Transition Time (t_T: tr/tf) of Input Signal
Input Reference Level
CONDITIONS
1.4V
See diagram below
2.4V/0.4V
1/1 nS
1.4V
output
Z = 50 ohms
1.4 V
50 ohms
30pF
AC TEST LOAD
- 18 -
Publication Release Date:Aug. 13, 2007
Revision A09