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參數(shù)資料
| 型號： | M381L5623MTM-CB3 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | DDR SDRAM Unbuffered Module |
| 中文描述： | DDR SDRAM的緩沖模塊 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 250K |
| 代理商： | M381L5623MTM-CB3 |
Preliminary
DDR SDRAM
2GB Unbuffered DIMM
Rev. 0.0 April 2004
Parameter
Symbol
B3
(DDR333@CL=2.5))
Min
A2
(DDR266@CL=2.0)
Min
B0
(DDR266@CL=2.5))
Min
Unit
Note
Max
Max
Max
Mode register set cycle time
tMRD
12
15
15
ns
DQ & DM setup time to DQS
tDS
0.45
0.5
0.5
ns
j, k
DQ & DM hold time to DQS
tDH
0.45
0.5
0.5
ns
j, k
Control & Address input pulse width
tIPW
2.2
2.2
2.2
ns
8
DQ & DM input pulse width
tDIPW
1.75
1.75
1.75
ns
8
Power down exit time
tPDEX
6
7.5
7.5
ns
Exit self refresh to non-Read command
tXSNR
75
75
75
ns
Exit self refresh to read command
tXSRD
200
200
200
tCK
Refresh interval time
tREFI
7.8
7.8
7.8
us
4
Output DQS valid window
tQH
tHP
-tQHS
-
tHP
-tQHS
-
tHP
-tQHS
-
ns
11
Clock half period
tHP
tCLmin
or tCHmin
-
tCLmin
or tCHmin
-
tCLmin
or tCHmin
-
ns
10, 11
Data hold skew factor
tQHS
0.55
0.75
0.75
ns
11
DQS write postamble time
tWPST
0.4
0.6
0.4
0.6
0.4
0.6
tCK
2
Active to Read with Auto precharge
command
tRAP
18
20
20
Autoprecharge write recovery +
Precharge time
tDAL
(tWR/tCK)
+(tRP/tCK)
(tWR/tCK)
+(tRP/tCK)
(tWR/tCK)
+(tRP/tCK)
tCK
13
System Characteristics for DDR SDRAM
The following specification parameters are required in systems using DDR333 & DDR266 devices to ensure proper sys-
tem performance. these characteristics are for system simulation purposes and are guaranteed by design.
Table 1 :
Input Slew Rate for DQ, DQS, and DM
Table 2
:
Input Setup & Hold Time Derating for Slew Rate
Table 3 : Input/Output Setup & Hold Time Derating for Slew Rate
AC CHARACTERISTICS
DDR333
DDR266
PARAMETER
SYMBOL
MIN
MAX
MIN
MAX
Units
Notes
DQ/DM/DQS input slew rate measured between
VIH(DC), VIL(DC) and VIL(DC), VIH(DC)
DCSLEW
TBD
TBD
TBD
TBD
V/ns
a, m
Input Slew Rate
tIS
tIH
Units
Notes
0.5 V/ns
0
0
ps
i
0.4 V/ns
+50
0
ps
i
0.3 V/ns
+100
0
ps
i
Input Slew Rate
tDS
tDH
Units
Notes
0.5 V/ns
0
0
ps
k
0.4 V/ns
+75
+75
ps
k
0.3 V/ns
+150
+150
ps
k
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