k4d553238f-jc Samsung Semiconductor, Inc., k4d553238f-jc Datasheet - Page 13

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

AC CHARACTERISTICS
Simplified Timing @ BL=2, CL=4
CK cycle time
CK high level width
CK low level width
DQS out access time from CK
Output access time from CK
Data strobe edge to Dout edge
Read preamble
Read postamble
CK to valid DQS-in
DQS-In setup time
DQS-in hold time
DQS write postamble
DQS-In high level width
DQS-In low level width
Address and Control input setup
Address and Control input hold
DQ and DM setup time to DQS
DQ and DM hold time to DQS
Clock half period
Data output hold time from DQS
COMMAND
K4D553238F-JC
CK, CK
DQS
DM
DQ
CS
Parameter
READA
0
CL=3
CL=4
1
1
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
CK
CH
CL
DQSCK
AC
DQSQ
RPRE
RPST
DQSS
WPRES
WPREH
WPST
DQSH
DQSL
IS
IH
DS
DH
HP
QH
Sym-
bol
tCHmin
tCLmin
-0.35
2.86
0.45
0.45
0.85
0.35
0.35
0.35
Min
-0.6
-0.6
tHP
0.9
0.4
0.4
0.4
0.4
0.9
0.9
or
0
-
-
2
-2A
Max
0.55
0.55
0.35
1.15
0.6
0.6
1.1
0.6
0.6
0.6
0.6
10
-
-
-
-
-
-
-
-
tCH
tCK
tCHmin
tCLmin
-0.35
0.45
0.45
0.85
0.35
0.35
0.35
Min
-0.6
-0.6
tHP
3.3
0.9
0.4
0.4
0.4
0.4
0.9
0.9
3
or
0
-
-
tCL
tRPRE
-33
- 13 -
Max
0.55
0.55
0.35
1.15
0.6
0.6
1.1
0.6
0.6
0.6
0.6
10
tAC
-
-
-
-
-
-
-
-
4
tCHmin
tCLmin
0.45
0.45
0.85
0.35
0.40
0.40
tDQSCK
-0.6
-0.6
Min
tHP
-0.4
3.6
0.9
0.4
0.4
0.4
0.4
0.9
0.9
Qa1
or
0
-
-
tDQSQ
-36
Qa2
tRPST
Max
0.55
0.55
0.40
1.15
0.6
0.6
1.1
0.6
0.6
0.6
0.6
10
-
-
-
-
-
-
-
-
5
tCHmin
tCLmin
0.45
0.45
0.85
0.35
0.40
0.40
Min
-0.6
-0.6
-0.4
tHP
4.0
0.9
0.4
0.4
0.4
0.4
0.9
0.9
or
0
-
-
tIS
-40
tIH
WRITEB
256M GDDR SDRAM
Max
0.55
0.55
0.40
1.15
0.6
0.6
1.1
0.6
0.6
0.6
0.6
10
-
-
-
-
-
-
-
-
6
t
WPRES
tCHmin
tCLmin
tDQSS
0.45
0.45
0.45
0.45
tHP-
0.45
Min
-0.7
-0.7
5.0
0.9
0.4
0.8
0.3
0.4
0.4
0.4
1.0
1.0
or
0
Rev 1.0 (Mar. 2004)
-
-
t
WPREH
-50
7
tDS tDH
Max
0.55
0.55
0.45
Db0
0.7
0.7
1.1
0.6
1.2
0.6
0.6
0.6
10
-
-
-
-
-
-
-
-
tDQSH
Db1
Unit
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tDQSL
8
Note
1
1
1