64M DDR SDRAM
K4D623238B-GC
AC CHARACTERISTICS (I)
-33
Min
-40
Max Min
-45
Max Min
-50
Max Min
-55
Max Min
-60
Max Min
Parameter
Row cycle time
Symbol
Unit Note
Max
17
19
12
6
15
17
10
5
13
15
9
tRC
-
-
-
12
14
8
-
12
14
8
-
10
12
7
-
-
tCK
tCK
Refresh row cycle time
Row active time
tRFC
-
100K
-
-
100K
-
-
100K
-
-
-
tRAS
100K
100K
100K tCK
RAS to CAS delay for Read
RAS to CAS delay for Write
Row precharge time
4
4
-
-
-
-
4
-
-
-
-
3
-
-
-
-
tCK
tCK
tCK
tCK
tRCDRD
tRCDWR
tRP
4
3
2
2
2
2
5
5
4
-
-
-
-
-
-
4
4
3
Row active to Row active
tRRD
3
3
2
2
2
2
Last data in to Row precharge
@Normal Precharge
3
3
3
3
3
3
tWR
-
-
-
-
-
-
2
3
-
-
2
3
-
-
2
3
-
-
tCK
tCK
1
Last data in to Row precharge
@Auto Precharge
tWR_A
1
1
Last data in to Read command tCDLR
2
1
2
-
-
-
2
1
2
-
-
-
2
1
2
-
-
-
2
1
2
-
-
-
2
1
2
-
-
-
2
1
2
-
-
-
tCK
tCK
tCK
Col. address to Col. address
Mode register set cycle time
tCCD
tMRD
Auto precharge write recovery
+ Precharge
tDAL
tXSR
8
-
-
8
-
-
7
-
-
7
-
-
7
-
-
6
-
-
tCK
tCK
Exit self refresh to read com-
200
200
200
200
1tCK+tIS
7.8
200
1tCK+tIS
7.8
200
1tCK+tIS
7.8
Power down exit time
Refresh interval time
1tCK+tIS
7.8
1tCK+tIS
7.8
1tCK+tIS
7.8
tPDEX
tREF
-
-
-
-
-
-
-
-
-
-
-
-
ns
us
Note : 1. For normal write operation, even numbers of Din are to be written inside DRAM
AC CHARACTERISTICS (II)
(Unit : Number of Clock)
K4D623238B-GC33
Frequency
Cas Latency
tRC
tRFC
tRAS
tRCDRD tRCDWR
tRP
tRRD
tDAL
Unit
333MHz ( 3.3ns )
5
17
19
12
6
4
5
3
8
tCK
K4D623238B-GC40
Frequency
Cas Latency
tRC
15
13
12
12
10
tRFC
17
tRAS
tRCDRD tRCDWR
tRP
5
tRRD
tDAL
Unit
tCK
tCK
tCK
tCK
tCK
250MHz ( 4.0ns )
222MHz ( 4.5ns )
200MHz ( 5.0ns )
183MHz ( 5.5ns )
166MHz ( 6.0ns )
4
4
3
3
3
10
9
5
4
4
4
3
3
2
2
2
2
3
2
2
2
2
8
7
7
7
6
15
4
14
8
4
14
8
4
12
7
3
K4D623238B-GC45
Frequency
Cas Latency
tRC
13
tRFC
15
tRAS
tRCDRD tRCDWR
tRP
4
tRRD
tDAL
Unit
tCK
tCK
tCK
tCK
222MHz ( 4.5ns )
200MHz ( 5.0ns )
183MHz ( 5.5ns )
166MHz ( 6.0ns )
4
3
3
3
9
8
8
7
4
4
4
3
2
2
2
2
2
2
2
2
7
7
7
6
12
14
4
12
14
4
10
12
3
- 15 -
Rev. 1.4 (Sep. 2002)
SAMSUNG [ SAMSUNG ]
