512MB, 1GB, 2GB Registered DIMMs
DDR2 SDRAM
DDR2-800
DDR2-667
DDR2-533
DDR2-400
Symbol
Units
Notes
Parameter
min
max
min
0.35
0.35
0.2
max
min
max
min
max
DQS input high pulse width
DQS input low pulse width
DQS falling edge to CK setup time
DQS falling edge hold time from CK
Mode register set command cycle time
Write postamble
tDQSH
tDQSL
tDSS
0.35
0.35
0.2
0.2
2
x
x
0.35
0.35
0.2
0.2
2
x
0.35
0.35
0.2
0.2
2
x
tCK
tCK
tCK
tCK
tCK
tCK
tCK
ps
x
x
x
x
x
x
x
x
tDSH
x
0.2
x
x
x
tMRD
x
2
x
x
x
tWPST
tWPRE
tIH(base)
tIS(base)
tRPRE
tRPST
0.4
0.35
250
175
0.9
0.4
0.6
x
0.4
0.6
x
0.4
0.35
375
250
0.9
0.4
0.6
x
0.4
0.35
475
350
0.9
0.4
0.6
x
Write preamble
0.35
275
200
0.9
Address and control input hold time
Address and control input setup time
Read preamble
x
x
x
x
x
x
x
x
ps
1.1
0.6
1.1
0.6
1.1
0.6
1.1
0.6
tCK
tCK
Read postamble
0.4
Active to active command period for 1KB
page size products
tRRD
7.5
10
35
45
x
x
7.5
10
x
x
7.5
10
x
x
7.5
10
x
x
ns
ns
ns
ns
Active to active command period for 2KB
page size products
tRRD
tFAW
Four Activate Window for 1KB page size
products
37.5
50
37.5
50
37.5
50
Four Activate Window for 2KB page size
products
tFAW
CAS to CAS command delay
Write recovery time
tCCD
tWR
2
x
x
2
2
2
tCK
ns
15
15
x
x
x
15
x
x
x
15
x
x
x
Auto precharge write recovery + precharge
time
tDAL
WR+tRP
x
WR+tRP
WR+tRP
WR+tRP
tCK
Internal write to read command delay
tWTR
7.5
7.5
7.5
7.5
7.5
7.5
10
7.5
ns
ns
Internal read to precharge command delay tRTP
Exit self refresh to a non-read command
Exit self refresh to a read command
tXSNR
tRFC + 10
200
tRFC + 10
200
tRFC + 10
200
tRFC + 10
200
ns
tXSRD
x
x
x
tCK
Exit precharge power down to any non-
read command
tXP
2
2
2
2
x
x
2
2
x
x
2
2
x
x
tCK
tCK
tCK
Exit active power down to read command tXARD
Exit active power down to read command
tXARDS
8 - AL
7 - AL
6 - AL
6 - AL
(slow exit, lower power)
CKE minimum pulse width
tCKE
tCK
3
2
3
2
3
2
3
2
(high and low pulse width)
ODT turn-on delay
tAOND
tAON
2
2
2
2
tCK
ns
tAC(max)
+ 0.7
tAC(max)
+0.7
tAC(max)
+1
tAC(max)
+1
ODT turn-on
tAC(min)
tAC(min)
tAC(min)
tAC(min)
2tCK +
tAC(max)
+1
tAC(min)+
2
tAC(min)+ 2tCK+tAC tAC(min)+ 2tCK+tAC tAC(min)+ 2tCK+tAC
ODT turn-on(Power-Down mode)
tAONPD
ns
2
(max)+1
2
(max)+1
2
(max)+1
ODT turn-off delay
ODT turn-off
tAOFD
tAOF
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
tCK
ns
tAC(max)
+ 0.6
tAC(max)
+ 0.6
tAC(max)+
0.6
tAC(max)+
0.6
tAC(min)
tAC(min)
tAC(min)
tAC(min)
2.5tCK +
tAC(max)
+1
2.5tCK+
tAC(max)
+1
2.5tCK+
tAC(max)
+1
tAC(min)+
2
tAC(min)+ 2.5tCK+tA tAC(min)+
tAC(min)+
2
ODT turn-off (Power-Down mode)
tAOFPD
ns
2
C(max)+1
2
ODT to power down entry latency
ODT power down exit latency
OCD drive mode output delay
tANPD
tAXPD
tOIT
3
8
0
3
8
0
3
8
0
3
8
0
tCK
tCK
ns
12
12
12
12
Minimum time clocks remains ON after
CKE asynchronously drops LOW
tIS+tCK
+tIH
tIS+tCK
+tIH
tIS+tCK
+tIH
tIS+tCK
+tIH
tDelay
ns
Rev. 1.2 Aug. 2005
SAMSUNG [ SAMSUNG ]
