K4T1G044QE Datasheet, PDF (21/46 Pages) Samsung semiconductor – 1Gb E-die DDR2 SDRAM

K4T1G044QE
K4T1G084QE
K4T1G164QE
datasheet
Rev. 1.11
DDR2 SDRAM
13.3 Timing Parameters by Speed Grade
(For information related to the entries in this table, refer to both the general notes and the specific notes following this table.)
Parameter
Symbol
DDR2-800
min
max
DDR2-667
min
max
DQ output access time from CK/CK
DQS output access time from CK/CK
Average clock HIGH pulse width
Average clock LOW pulse width
CK half pulse period
Average clock period
DQ and DM input hold time
DQ and DM input setup time
tAC
tDQSCK
tCH(avg)
tCL(avg)
tHP
tCK(avg)
tDH(base)
tDS(base)
-400
-350
0.48
0.48
Min(tCL(abs),
tCH(abs))
2500
125
50
400
350
0.52
0.52
x
8000
x
x
-450
-400
0.48
0.48
Min(tCL(abs),
tCH(abs))
3000
175
100
450
400
0.52
0.52
x
8000
x
x
Control & Address input pulse width for each input
DQ and DM input pulse width for each input
Data-out high-impedance time from CK/CK
tIPW
tDIPW
tHZ
0.6
x
0.6
x
0.35
x
0.35
x
x
tAC(max)
x
tAC(max)
DQS/DQS low-impedance time from CK/CK
DQ low-impedance time from CK/CK
DQS-DQ skew for DQS and associated DQ signals
tLZ(DQS)
tLZ(DQ)
tDQSQ
tAC(min)
2* tAC(min)
x
tAC(max)
tAC(max)
200
tAC(min)
2* tAC(min)
x
tAC(max)
tAC(max)
240
DQ hold skew factor
DQ/DQS output hold time from DQS
DQS latching rising transitions to associated clock edges
tQHS
tQH
tDQSS
x
300
x
340
tHP - tQHS
x
tHP - tQHS
x
- 0.25
0.25
-0.25
0.25
DQS input HIGH pulse width
DQS input LOW pulse width
DQS falling edge to CK setup time
tDQSH
0.35
x
0.35
x
tDQSL
0.35
x
0.35
x
tDSS
0.2
x
0.2
x
DQS falling edge hold time from CK
Mode register set command cycle time
MRS command to ODT update delay
Write postamble
Write preamble
tDSH
tMRD
tMOD
tWPST
tWPRE
0.2
x
0.2
x
2
x
2
x
0
12
0
12
0.4
0.6
0.4
0.6
0.35
x
0.35
x
Address and control input hold time
Address and control input setup time
Read preamble
tIH(base)
250
x
275
x
tIS(base)
175
x
200
x
tRPRE
0.9
1.1
0.9
1.1
Read postamble
tRPST
Activate to activate command period for 1KB page size products tRRD
Activate to activate command period for 2KB page size products tRRD
0.4
0.6
0.4
0.6
7.5
x
7.5
x
10
x
10
x
Units
NOTE
ps
ps
tCK(avg)
tCK(avg)
40
40
35,36
35,36
ps
37
ps
ps
ps
tCK(avg)
tCK(avg)
ps
ps
ps
ps
ps
ps
tCK(avg)
tCK(avg)
tCK(avg)
tCK(avg)
tCK(avg)
nCK
ns
tCK(avg)
tCK(avg)
ps
ps
tCK(avg)
tCK(avg)
ns
ns
35,36
6,7,8,21,28,31
6,7,8,20,28,31
18,40
18,40
18,40
13
38
39
30
30
30
32
10
5,7,9,23,29
5,7,9,22,29
19,41
19,42
4,32
4,32
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