K4T51043QE Datasheet, PDF (21/45 Pages) Samsung semiconductor – 512Mb E-die DDR2 SDRAM Specification

K4T51043QE
K4T51083QE
K4T51163QE
DDR2 SDRAM
Parameter
Symbol
DDR2-800
min
max
DDR2-667
min
max
DDR2-533
min
max
DDR2-400
min
max
Units Notes
Active to active
size products
command
period
for
2KB
page
tRRD
10
x
10
x
10
x
10
x
ns
12
Four Activate Window for 1KB page size products tFAW
35
37.5
37.5
37.5
ns
Four Activate Window for 2KB page size products tFAW
45
50
50
50
ns
CAS to CAS command delay
tCCD
2
x
2
2
2
tCK
Write recovery time
tWR
15
x
15
x
15
x
15
x
ns
Auto precharge write recovery + precharge time tDAL
WR+tRP
x
WR+tRP
x
WR+tRP
x
WR+tRP
x
tCK 23
Internal write to read command delay
tWTR
7.5
7.5
x
7.5
x
10
x
ns
33
Internal read to precharge command delay
tRTP
7.5
7.5
7.5
7.5
ns
11
Exit self refresh to a non-read command
tXSNR tRFC + 10
tRFC + 10
tRFC + 10
tRFC + 10
ns
Exit self refresh to a read command
tXSRD
200
x
200
200
200
tCK
Exit precharge power down to any non-read com-
mand
tXP
2
x
2
x
2
x
2
x
tCK
Exit active power down to read command
tXARD
2
x
2
x
2
x
2
x
tCK
9
Exit active power down to read command
(slow exit, lower power)
tXARDS
8 - AL
7 - AL
6 - AL
6 - AL
tCK 9, 10
CKE minimum pulse width
(high and low pulse width)
ODT turn-on delay
t_CKE
3
3
3
3
tCK 36
t_AOND
2
2
2
2
2
2
2
2
tCK
ODT turn-on
t_AON
tAC(min)
tAC(max)
+ 0.7
tAC(min)
tAC(max)
+0.7
tAC(min)
tAC(max)
+1
tAC(min)
tAC(max)
+1
ns
13, 25
ODT turn-on(Power-Down mode)
ODT turn-off delay
t_AONPD
t_AOFD
tAC(min)+
2
2tCK +
tAC(max)
+1
tAC(min)+
2
2tCK+tAC tAC(min)+
(max)+1
2
2tCK+tA
C(max)+
1
tAC(min)+
2
2tCK+tAC
(max)+1
ns
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
tCK
ODT turn-off
t_AOF
tAC(min)
tAC(max)
+ 0.6
tAC(min)
tAC(max)
+ 0.6
tAC(min)
tAC(max)
+ 0.6
tAC(min)
tAC(max)
+ 0.6
ns
26
ODT turn-off (Power-Down mode)
t_AOFPD
tAC(min)+
2
2.5tCK +
tAC(max)
+1
tAC(min)+
2
2.5tCK+t
AC(max)
+1
tAC(min)+
2
2.5tCK+
tAC(max)
+1
tAC(min)+
2
2.5tCK+
tAC(max)
+1
ns
ODT to power down entry latency
tANPD
3
3
3
3
tCK
ODT power down exit latency
tAXPD
8
8
8
8
tCK
OCD drive mode output delay
tOIT
0
12
0
12
0
12
0
12
ns
Minimum time clocks remains ON after CKE asyn-
chronously drops LOW
tDelay
tIS+tCK
+tIH
tIS+tCK
+tIH
tIS+tCK
+tIH
tIS+tCK
+tIH
ns
24
21 of 45
Rev. 1.8 July 2007