K4D623238B-GC Datasheet, PDF (15/17 Pages) Samsung semiconductor – 64Mbit DDR SDRAM

K4D623238B-GC
64M DDR 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
@Normal 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
+ Precharge
tD A L
Exit self refresh to read com- _tXSR
-33
Min Max
17
-
19
-
12 100K
6
-
4
5
-
3
-
3
-
3
-
2
-
1
-
2
-
8
-
200
-
-40
Min Max
15
-
17
-
10 100K
5
-
3
5
-
3
-
3
-
3
-
2
-
1
-
2
-
8
-
200
-
-45
Min Max
13
-
15
-
9 100K
4
-
2
4
-
2
-
3
-
3
-
2
-
1
-
2
-
7
-
200
-
-50
Min Max
12
-
14
-
8 100K
4
-
2
-
4
-
2
-
2
-
3
-
2
-
1
-
2
-
7
-
200 -
-55
Min Max
12
-
14
-
8 100K
4
-
2
-
4
-
2
-
2
-
3
-
2
-
1
-
2
-
7
-
200 -
-60
Unit Note
Min Max
10
- tCK
12
- tCK
7 100K tCK
3
- tCK
2
- tCK
3
- tCK
2
- tCK
2
- tCK 1
3
- tCK 1
2
- tCK 1
1
- tCK
2
- tCK
6
- tCK
200 - tCK
Power down exit time
Refresh interval time
tPDEX 1tCK+tIS - 1tCK+tIS - 1tCK+tIS - 1tCK+tIS - 1tCK+tIS - 1tCK+tIS - ns
tR E F
7.8
-
7.8
-
7.8
-
7.8
-
7.8
-
7.8
- us
Note : 1. For normal write operation, even numbers of Din are to be written inside DRAM
AC CHARACTERISTICS (II)
K4D623238B-GC33
Frequency
Cas Latency tRC
333MHz ( 3.3ns )
5
17
tRFC
19
tRAS tRCDRD tRCDWR tRP
12
6
4
5
(Unit : Number of Clock)
tRRD
3
tDAL Unit
8
tCK
K4D623238B-GC40
Frequency
Cas Latency tRC
250MHz ( 4.0ns )
4
15
222MHz ( 4.5ns )
4
13
200MHz ( 5.0ns )
3
12
183MHz ( 5.5ns )
3
12
166MHz ( 6.0ns )
3
10
tRFC
17
15
14
14
12
tRAS tRCDRD tRCDWR tRP
10
5
3
5
9
4
2
4
8
4
2
4
8
4
2
4
7
3
2
3
tRRD
3
2
2
2
2
tDAL Unit
8
tCK
7
tCK
7
tCK
7
tCK
6
tCK
K4D623238B-GC45
Frequency
Cas Latency tRC
222MHz ( 4.5ns )
4
13
200MHz ( 5.0ns )
3
12
183MHz ( 5.5ns )
3
12
166MHz ( 6.0ns )
3
10
tRFC
15
14
14
12
tRAS tRCDRD tRCDWR tRP
9
4
2
4
8
4
2
4
8
4
2
4
7
3
2
3
tRRD
2
2
2
2
tDAL Unit
7
tCK
7
tCK
7
tCK
6
tCK
- 15 -
Rev. 1.4 (Sep. 2002)