K4S643232C
CMOS SDRAM
Version
-70
7
Parameter
Symbol
Unit
-55
5.5
-60
6
-80
8
-10
10
CLK cycle time
tCC(min)
ns
ns
ns
ns
ns
us
ns
ns
Row active to row active delay
RAS to CAS delay
tRRD(min)
tRCD(min)
tRP(min)
11
12
18
18
42
14
16
20
20
48
20
20
20
48
16.5
16.5
38.5
21
Row precharge time
21
tRAS(min)
tRAS(max)
tRC(min)
tRFC(min)
49
Row active time
100
70
Row cycle time
55
66
60
72
70
70
70
70
Row cycle time in Auto refresh
70
2. Minimum delay is required to complete write.
3. All parts allow every cycle column address change.
4. In case of row precharge interrupt, auto precharge and read burst stop.
5. For -55/60/70/80/10, tRDL=1CLK product can be supported within restricted amounts and it will be distinguished by bucket
code "NV". From the next generation, tRDL will be only 2CLK for every clock frequency.
6. A new command should be issued after self refersh exit followed by tRFC.
AC CHARACTERISTICS (AC operating conditions unless otherwise noted)
-55
-60
-70
-80
-10
Parameter
Symbol
tCC
Unit Note
Min Max Min Max Min Max Min Max Min Max
CAS Latency=3
5.5
-
6
7
8
10
-
10
12
-
CLK cycle time
1000
1000
1000
1000
1000 ns
1
CAS Latency=2
CAS Latency=3
CAS Latency=2
-
-
-
-
-
5
-
5.5
5.5
6
6
-
6
8
-
CLK to valid
output delay
tSAC
ns
1, 2
-
-
-
-
-
-
-
-
-
Output data
tOH
tCH
2
2
-
-
2.5
2.5
-
2.5
2.5
2.5
ns
ns
2
3
CAS Latency=3
CAS Latency=2
CAS Latency=3
CAS Latency=2
CAS Latency=3
CAS Latency=2
-
CLK high pulse width
-
-
-
3
3
-
-
-
3
3
2
-
-
-
3.5
3.5
2.5
-
-
-
-
2
-
-
2.5
-
CLK low pulse width
Input setup time
tCL
tSS
ns
ns
3
3
-
1.5
-
-
1.5
-
1.75
-
-
1
1
-
Input hold time
tSH
1
1
-
-
1
1
-
-
-
-
-
1
1
-
-
-
1
1
-
-
-
ns
ns
3
2
CLK to output in Low-Z
tSLZ
-
CAS Latency=3
CAS Latency=2
5
-
5.5
-
5.5
-
6
6
6
8
CLK to output
in Hi-Z
tSHZ
ns
-
-
-
-
-
Note :
1. Parameters depend on programmed CAS latency.
2. If clock rising time is longer than 1ns, (tr/2-0.5)ns should be added to the parameter.
3. Assumed input rise and fall time (tr & tf)=1ns.
If tr & tf is longer than 1ns, transient time compensation should be considered,
i.e., [(tr + tf)/2-1]ns should be added to the parameter.
REV. 1.1 Nov. '99
- 8 -
SAMSUNG [ SAMSUNG ]
