K4D623238B-GC Datasheet, PDF (13/17 Pages) Samsung semiconductor – 64Mbit DDR SDRAM

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