64M DDR SDRAM
K4D623238B-GC
AC CHARACTERISTICS
-33
-40
Min
-45
-50
-55
-60
Parameter
Symbol
Unit Note
Min
Max
Max
Min Max Min Max Min Max Min
Max
CL=3
CL=4
-
-
5.0
4.0
5.0
4.5
5.0
5.5
6.0
ns
ns
-
-
-
CK cycle time
7
10
10
10
10
10
tCK
CL=5
3.3
-
-
-
-
-
ns
CK high level width
CK low level width
0.45
0.45
-0.6
-0.6
-
0.55
0.55
0.6
0.6
0.35
1.1
0.6
1.15
-
0.45
0.45
-0.6
-0.6
-
0.55
0.55
0.6
0.6
0.4
1.1
0.6
1.15
-
0.45
0.45
-0.7
-0.7
-
0.55
0.55
0.7
0.7
0.45
1.1
0.6
1.2
-
0.45
0.45
-0.7
-0.7
-
0.55
0.55
0.7
0.7
0.45
1.1
0.6
1.2
-
0.45
0.55 0.45
0.55 tCK
0.55 tCK
tCH
tCL
0.45
0.55 0.45
DQS out access time from CK
Output access time from CK
-0.75 0.75 -0.75
-0.75 0.75 -0.75
0.75
0.75
0.5
ns
ns
tDQSCK
tAC
Data strobe edge to Dout edge tDQSQ
-
0.5
1.1
0.6
-
ns
1
Read preamble
tRPRE
0.9
0.4
0.85
0
0.9
0.4
0.85
0
0.9
0.4
0.8
0
0.9
0.4
0.8
0
0.9
0.4
0.75
0
0.9
0.4
1.1
tCK
tCK
Read postamble
tRPST
0.6
CK to valid DQS-in
DQS-In setup time
DQS-in hold time
1.25 0.75
1.25 tCK
tDQSS
tWPRES
tWPREH
tWPST
tDQSH
tDQSL
-
0
-
ns
tCK
tCK
tCK
tCK
ns
0.35
0.4
0.4
0.4
0.9
0.9
0.35
0.35
-
0.35
0.4
0.4
0.4
0.9
0.9
0.4
0.4
-
0.3
0.4
0.4
0.4
1.0
1.0
0.45
0.45
-
0.3
0.4
0.4
0.4
1.0
1.0
0.45
0.45
-
0.25
0.4
0.4
0.4
1.1
1.1
0.5
0.5
-
0.6
0.6
0.6
-
0.25
0.4
0.4
0.4
1.1
1.1
0.5
0.5
-
0.6
0.6
0.6
-
DQS write postamble
DQS-In high level width
DQS-In low level width
0.6
0.6
0.6
-
0.6
0.6
0.6
-
0.6
0.6
0.6
-
0.6
0.6
0.6
-
Address and Control input setup tIS
Address and Control input hold tIH
-
-
-
-
-
-
ns
DQ and DM setup time to DQS
tDS
-
-
-
-
-
-
ns
DQ and DM hold time to DQS
tDH
-
-
-
-
-
-
ns
tCLmin
or
tCHmin
tHP-
tCLmin
or
tCHmin
tCLmin
or
tCHmin
tHP-
tCLmin
or
tCHmin
tHP-
tCLmin
or
tCHmin
tCLmin
or
tCHmin
Clock half period
-
-
-
-
-
-
-
-
-
-
-
-
ns
ns
1
1
tHP
Data output hold time from DQS
tHP-0.4
tHP-0.5
tHP-0.5
tQH
0.35
0.45
0.45
Simplified Timing @ BL=2, CL=4
tCH
tCL
tCK
0
1
2
3
4
5
6
7
8
CK, CK
CS
tIS
tIH
tDQSCK
tDQSS
tWPREH
tDQSH
tDQSL
tRPRE
tRPST
DQS
tWPRES
tDQSQ
tDS tDH
tAC
DQ
DM
Qa1
Qa2
Db0
Db1
COMMAND
WRITEB
READA
- 13 -
Rev. 1.4 (Sep. 2002)
SAMSUNG [ SAMSUNG ]
