K4D263238E Datasheet, PDF (15/17 Pages) Samsung semiconductor – 1M x 32Bit x 4 Banks Graphic Double Data Rate Synchronous DRAM with Bi-directional Data Strobe and DLL

K4D263238E-GC
128M GDDR SDRAM
AC CHARACTERISTICS (I)
Parameter
Symbol
Row cycle time
tRC
Refresh row cycle time
tRFC
Row active time
tRAS
RAS to CAS delay for Read
tRCDRD
RAS to CAS delay for Write
tRCDWR
Row precharge time
tRP
Row active to Row active
tRRD
Last data in to Row precharge @Nor-
mal Precharge
tWR
Last data in to Row precharge @Auto
Precharge
tWR_A
Last data in to Read command
tCDLR
Col. address to Col. address
tCCD
Mode register set cycle time
tMRD
Auto precharge write recovery + Pre-
charge
tDAL
Exit self refresh to read command tXSR
Power down exit time
tPDEX
Refresh interval time
tREF
-25
Min Max
17
-
19
-
12 100K
6
-
4
-
5
-
4
-
3
-
3
-
2
-
1
-
2
-
8
-
200
-
3tCK+
tIS
-
7.8
-
-2A
Min Max
15
-
17
-
10 100K
5
-
3
-
5
-
4
-
3
-
3
-
2
-
1
-
2
-
8
-
200
-
3tCK+
tIS
-
7.8
-
-33
Min Max
13
-
15
-
9
100K
4
-
2
-
4
-
3
-
3
-
3
-
2
-
1
-
2
-
7
-
200
-
3tCK+
tIS
-
7.8
-
-36
Min Max
13
-
15
-
9
100K
4
-
2
-
4
-
3
-
3
-
3
-
2
-
1
-
2
-
7
-
200
-
3tCK+
tIS
-
7.8
-
-40
Min Max
13
-
15
-
9
100K
4
-
2
-
4
-
3
-
3
-
3
-
2
-
1
-
2
-
7
-
200
-
3tCK+
tIS
-
7.8
-
-45
Unit Note
Min Max
12
- tCK
14
- tCK
8
100K tCK
4
- tCK
2
- tCK
4
- tCK
3
- tCK
3
- tCK 1
3
- tCK 1
2
- tCK 1
1
- tCK
2
- tCK
7
- tCK
200
3tCK+
tIS
7.8
- tCK
-
ns
-
us
Note : 1. For normal write operation, even numbers of Din are to be written inside DRAM
(Unit : Number of Clock)
AC CHARACTERISTICS (II)
K4D263238E-GC25
Frequency
Cas Latency tRC
400MHz ( 2.5ns )
5
17
tRFC
19
tRAS tRCDRD tRCDWR tRP
12
6
4
5
tRRD
4
tDAL Unit
8
tCK
K4D263238E-GC2A
Frequency
Cas Latency tRC
350MHz ( 2.86ns )
4
15
300MHz ( 3.3ns )
4
13
275MHz ( 3.6ns )
4
13
250MHz ( 4.0ns )
4
13
222MHz ( 4.5ns )
3
12
tRFC
17
15
15
15
14
tRAS tRCDRD tRCDWR tRP
10
5
3
5
9
4
2
4
9
4
2
4
9
4
2
4
8
4
2
4
tRRD
4
3
3
3
3
tDAL Unit
8
tCK
7
tCK
7
tCK
7
tCK
7
tCK
K4D263238E-GC33
Frequency
Cas Latency tRC
300MHz ( 3.3ns )
4
13
275MHz ( 3.6ns )
4
13
250MHz ( 4.0ns )
4
13
222MHz ( 4.5ns )
3
12
tRFC
15
15
15
14
tRAS tRCDRD tRCDWR tRP
9
4
2
4
9
4
2
4
9
4
2
4
8
4
2
4
tRRD
3
3
3
3
tDAL Unit
7
tCK
7
tCK
7
tCK
7
tCK
- 15 -
Rev 1.7 (Nov. 2003)