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K4D261638E-TC40 Datasheet

  • K4D261638E-TC40

  • 2M x 16Bit x 4 Banks Double Data Rate Synchronous DRAM

  • 16頁

  • SAMSUNG   SAMSUNG

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K4D261638E
AC CHARACTERISTICS (I)
Parameter
Row cycle time
Refresh row cycle time
Row active time
RAS to CAS delay for Read
RAS to CAS delay for Write
Row precharge time
Row active to Row active
Last data in to Row precharge
@Normal Precharge
Last data in to Row precharge
@Auto Precharge
Last data in to Read command
Col. address to Col. address
Mode register set cycle time
Auto precharge write recovery +
Precharge
Exit self refresh to read command
Power down exit time
Refresh interval time
128M DDR SDRAM
-2A
Min
15
17
10
4
2
5
3
3
3
3
1
2
8
200
3tCK
+tIS
7.8
Symbol
tRC
tRFC
tRAS
tRCDRD
tRCDWR
tRP
tRRD
tWR
tWR_A
tCDLR
tCCD
tMRD
tDAL
tXSR
tPDEX
tREF
-33
Max
Min
15
17
10
4
2
5
3
3
3
3
1
2
8
200
3tCK
+tIS
7.8
-36
Max
-
-
100K
-
-
-
-
-
-
-
-
-
-
-
-
-
-40
Max
-
-
100K
-
-
-
-
-
-
-
-
-
-
-
-
-
-50
Max
-
-
100K
-
-
-
-
-
-
-
-
-
-
-
-
-
Min
15
17
10
4
2
5
3
3
3
2
1
2
8
200
3tCK
+tIS
7.8
Min
13
15
9
4
2
4
3
3
3
2
1
2
7
200
3tCK
+tIS
7.8
Min
12
14
8
4
2
4
3
3
3
2
1
2
7
200
3tCK
+tIS
7.8
Max
-
-
100K
-
-
-
-
-
-
-
-
-
-
-
-
-
Unit Note
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
ns
us
1
1
1
-
-
100K
-
-
-
-
-
-
-
-
-
-
-
-
-
Note : 1. For normal write operation, even numbers of Din are to be written inside DRAM
AC CHARACTERISTICS (II)
K4D261638E-TC2A
Frequency
Cas Latency
350MHz ( 2.86ns )
4
300MHz ( 3.3ns )
4
275MHz ( 3.6ns )
4
250MHz ( 4.0ns )
3
200MHz ( 5.0ns )
3
tRC
15
15
15
13
12
tRFC
17
17
17
15
14
tRAS
10
10
10
9
8
tRCDRD tRCDWR
4
2
4
2
4
2
4
2
4
2
tRP
5
5
5
4
4
tRRD
3
3
3
3
3
(Unit : Number of Clock)
tDAL
8
8
8
7
7
Unit
tCK
tCK
tCK
tCK
tCK
K4D261638E-TC33
Frequency
Cas Latency
300MHz ( 3.3ns )
4
275MHz ( 3.6ns )
4
250MHz ( 4.0ns )
3
200MHz ( 5.0ns )
3
tRC
15
15
13
12
tRFC
17
17
15
14
tRAS
10
10
9
8
tRCDRD tRCDWR
4
2
4
2
4
2
4
2
tRP
5
5
4
4
tRRD
3
3
3
3
tDAL
8
8
7
7
Unit
tCK
tCK
tCK
tCK
- 14 -
Rev. 1.2 (Jul. 2003)

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