k4d553238f-gc Samsung Semiconductor, Inc., k4d553238f-gc Datasheet - Page 15

• Manufacturer Part Number: k4d553238f-gc
• Description: 256mbit Gddr Sdram
• Manufacturer: Samsung Semiconductor, Inc.

AC CHARACTERISTICS (I)
Note : 1. For normal write operation, even numbers of Din are to be written inside DRAM
AC CHARACTERISTICS (II)
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
Last data in to Row precharge
@Auto Precharge
Auto precharge write recovery +
Precharge
Last data in to Read command
Col. address to Col. address
Mode register set cycle time
Exit self refresh to read command
Power down exit time
Refresh interval time
K4D553238F-GC2A
K4D553238F-GC33
K4D553238F-GC36
K4D553238F-GC
350MHz ( 2.86ns )
300MHz ( 3.3ns )
275MHz ( 3.6ns )
300MHz ( 3.3ns )
275MHz ( 3.6ns )
275MHz ( 3.6ns )
Frequency
Frequency
Frequency
2. The number of clock of tRP is restricted by the number of clock of tRAS and tRP
3. The number of clock of tWR_A is fixed. It can’t be changed by tCK
4. tRCDWR is equal to tRCDRD-2tCK and the number of clock can not be lower than 2tCK.
5. The minimum number of clock cycles is determined by dividing the minimum time required with clock cycle time and then
rounding off to the next higher integer unconditionally.
Parameter
Cas Latency
Cas Latency
Cas Latency
4
4
4
4
4
4
tRC
tRFC
tRAS
tRCDRD
tRCDWR
tRP
tRRD
tWR
tWR_A
tDAL
tCDLR
tCCD
tMRD
tXSR
tPDEX
tREF
Symbol
tRC
tRC
tRC
15
13
13
13
13
13
3tCK+
42.9
48.6
28.6
13.2
13.2
14.3
Min
200
6.6
9.9
7.8
tIS
10
5
2
1
2
tRFC
tRFC
tRFC
17
15
15
15
15
15
-2A
100K
Max
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
tRAS
tRAS
tRAS
10
9
9
9
9
9
- 15 -
tRCDRD tRCDWR
tRCDRD tRCDWR
tRCDRD tRCDWR
3tCK+
42.9
49.5
29.7
13.2
13.2
16.5
Min
200
6.6
9.9
7.8
tIS
5
9
2
1
2
5
4
4
4
4
4
-33
100K
Max
3
2
2
2
2
2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
256M GDDR SDRAM
tRP
tRP
tRP
5
4
4
4
4
4
3tCK+
46.8
14.4
14.4
32.4
10.8
Min
200
7.2
7.8
tIS
54
18
5
9
2
1
2
-36
tRRD
tRRD
tRRD
Rev 1.3 (Mar. 2005)
4
3
3
3
3
3
100K
Max
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
tDAL
tDAL
tDAL
10
9
9
9
9
9
Unit
tCK
tCK
tCK
tCK
tCK
tCK
ns
ns
ns
ns
ns
ns
ns
ns
ns
us
Note
Unit
tCK
tCK
tCK
Unit
tCK
tCK
Unit
tCK
2,5
3,5
5
5
5
4
5
5
5
3
1