K4H510438A-TCA0 SAMSUNG [Samsung semiconductor], K4H510438A-TCA0 Datasheet - Page 45

• Manufacturer Part Number: K4H510438A-TCA0
• Description: 128Mb DDR SDRAM
• Manufacturer: SAMSUNG [Samsung semiconductor]

128Mb DDR SDRAM
1. Maximum burst refresh of 8
2. tHZQ transitions occurs in the same access time windows as valid data transitions. These parameters are not referenced
3. The specific requirement is that DQS be valid(High or Low) on or before this CK edge. The case shown(DQS going from
4. The maximum limit for this parameter is not a device limit. The device will operate with a great value for this parameter,
5. The value of tQCSW min. is 1.25ns from the last low going data strobe edge to QFC high. And the value of
6. the value of tQCSWI max. is 1.5tcK from the first high going clock edge after the last low going data strobe
7. A write command can be applied with tRCD satisfied after this command.
Exit self refresh to bank active command tXSA
Exit self refresh to read command
Refresh interval time
Output DQS valid window
Clock half period
DQS write postamble time
QFC setup to first DQS edge on reads
QFC hold after last DQS edge on reads
Write command to QFC delay on write
Write burst end to QFC delay on write
Write burst end to QFC delay on write
interrupted by Precharge
to a specific voltage level, but specify when the device output is no longer driving.
but system performance (bus turnaround) will degrade accordingly.
high.
tQCSW max. is 0.5tcK from the first high going clock edge after the last low going data strobe edge to QFC
edge to QFC high.
High_Z to logic Low) applies when no writes were previously in progress on the bus. If a previous write was in progress,
DQS could be High at this time, depending on tDQSS.
Parameter
64Mb, 128Mb
256Mb
Table 14. AC timing parameters and specifications
tXSR
tREF
tQH
tHP
tWPST
tQCS
tQCH
tQCSW
tQCHW
tQCHWI
Symbol
or tCHmin
-A2(PC266@CL=2) -B0(PC266@CL=2.5) -A0(PC200@CL=2)
-0.75ns
tHPmin
tCLmin
1.25ns
15.6
0.25
Min
200
7.8
0.9
0.4
75
-
- 45 -
0.5tCK
1.5tCK
Max
1.1
0.6
4.0
-
-
or tCHmin
-0.75ns
tHPmin
tCLmin
1.25ns
15.6
0.25
Min
200
7.8
0.9
0.4
75
-
REV. 1.0 November. 2. 2000
0.5tCK
1.5tCK
Max
1.1
0.6
4.0
-
-
or tCHmin
tHPmin
tCLmin
1.25ns
-1.0ns
15.6
0.25
Min
200
7.8
0.9
0.4
80
-
0.5tCK
1.5tCK
Max
1.1
0.6
4.0
-
-
Cycle
Unit
tCK
tCK
tCK
ns
us
us
ns
ns
ns
Note
7
1
1
4
5
6