K4T1G044QA Datasheet, PDF (19/28 Pages) Samsung semiconductor – 1Gb A-die DDR2 SDRAM Specification

1G A-die DDR2 SDRAM
DDR2 SDRAM
Timing Parameters by Speed Grade
(Refer to notes for informations related to this table at the bottom)
Parameter
Symbol
DDR2-667
min
max
DQ output access time from CK/CK
DQS output access time from CK/CK
CK high-level width
CK low-level width
CK half period
Clock cycle time, CL=x
tAC
tDQSCK
tCH
tCL
tHP
tCK
-450
-400
0.45
0.45
min(tCL, tCH)
3000
+450
+400
0.55
0.55
x
8000
DQ and DM input hold time
tDH(base)
175
x
DDR2-533
min
max
-500
+500
-450
+450
0.45
0.55
0.45
0.55
min(tCL, tCH)
x
3750
8000
225
x
DDR2-400
min
max
-600
+600
-500
+500
0.45
0.55
0.45
0.55
min(tCL, tCH)
x
5000
8000
275
x
DQ and DM input setup time
tDS(base)
100
Control & Address input pulse width for each input tIPW
DQ and DM input pulse width for each input
tDIPW
Data-out high-impedance time from CK/CK
tHZ
DQS low-impedance time from CK/CK
tLZ(DQS)
DQ low-impedance time from CK/CK
tLZ(DQ)
DQS-DQ skew for DQS and associated DQ signals tDQSQ
DQ hold skew factor
tQHS
DQ/DQS output hold time from DQS
tQH
First DQS latching transition to associated clock
edge
tDQSS
DQS input high pulse width
tDQSH
DQS input low pulse width
tDQSL
DQS falling edge to CK setup time
tDSS
DQS falling edge hold time from CK
tDSH
Mode register set command cycle time
tMRD
Write postamble
tWPST
Write preamble
tWPRE
0.6
0.35
x
tAC min
2*tAC min
x
x
tHP - tQHS
-0.25
0.35
0.35
0.2
0.2
2
0.4
0.35
Address and control input hold time
tIH(base)
275
x
x
x
tAC max
tAC max
tAC max
240
340
x
0.25
x
x
x
x
x
0.6
x
x
100
0.6
0.35
x
tAC min
2* tACmin
x
x
tHP - tQHS
-0.25
0.35
0.35
0.2
0.2
2
0.4
0.35
375
x
150
x
x
tAC max
tAC max
tAC max
300
400
x
0.6
0.35
x
tAC min
2* tACmin
x
x
tHP - tQHS
0.25
-0.25
x
0.35
x
0.35
x
0.2
x
0.2
x
2
0.6
0.4
x
0.35
x
475
x
x
x
tAC max
tAC max
tAC max
350
450
x
0.25
x
x
x
x
x
0.6
x
x
Address and control input setup time
tIS(base)
200
x
250
x
350
x
Read preamble
tRPRE
0.9
1.1
0.9
1.1
0.9
1.1
Read postamble
tRPST
0.4
0.6
0.4
0.6
0.4
0.6
Active to active command period for 1KB page size
tRRD
7.5
x
7.5
x
7.5
x
products
Active to active command period for 2KB page size
tRRD
10
x
10
x
10
x
products
Four Activate Window for 1KB page size products tFAW
37.5
37.5
37.5
Four Activate Window for 2KB page size products tFAW
50
50
50
Units Notes
ps
ps
tCK
tCK
ps 20,21
ps
24
15,16,
ps
17,20
15,16,
ps
17,21
tCK
tCK
ps
ps
27
ps
27
ps
22
ps
21
ps
tCK
tCK
tCK
tCK
tCK
tCK
tCK
19
tCK
14,16,
ps
18,23
14,16,
ps
18,22
tCK
28
tCK
28
ns
12
ns
12
ns
ns
Page 19 of 28
Rev. 1.1 Aug. 2005