Datasheet

Rev. 1.0 July 2008
DDR2 SDRAM
RDIMM
22 of 26
Parameter Symbol
DDR2-533 DDR2-400
Units Notes
min max min max
Four Activate Window for 1KB page size products tFAW 37.5 x 37.5 x ns
Four Activate Window for 2KB page size products tFAW 50 x 50 x ns
CAS to CAS command delay tCCD 2 x 2 x tCK
Write recovery time tWR 15 x 15 x ns
Auto precharge write recovery + precharge time tDAL WR+tRP x WR+tRP x tCK 14
Internal write to read command delay tWTR 7.5 x10x ns 24
Internal read to precharge command delay tRTP 7.5 x7.5 x ns 3
Exit self refresh to a non-read command tXSNR tRFC + 10 x tRFC + 10 x ns
Exit self refresh to a read command tXSRD 200 x200 x tCK
Exit precharge power down to any non-read command tXP 2 x 2 x tCK
Exit active power down to read command tXARD 2 x 2 x tCK 1
Exit active power down to read command
(slow exit, lower power)
tXARDS 6 - AL x 6 - AL x tCK 1,2
CKE minimum pulse width (HIGH and LOW pulse width) tCKE 3
x3 xtCK 27
ODT turn-on delay tAOND 2 2 2 2 tCK 16
ODT turn-on tAON tAC(min) tAC(max)+1 tAC(min) tAC(max)+1 ns 16
ODT turn-on (Power-Down mode) tAONPD tAC(min)+2
2tCK+
tAC(max)+1
tAC(min)+2
2tCK+
tAC(max)+1
ns
ODT turn-off delay tAOFD 2.5 2.5 2.5 2.5 tCK 17,44
ODT turn-off tAOF tAC(min)
tAC(max)
+ 0.6
tAC(min)
tAC(max)
+ 0.6
ns 17,44
ODT turn-off (Power-Down mode) tAOFPD 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
x3 xtCK
ODT power down exit latency tAXPD 8
x8 xtCK
OCD drive mode output delay tOIT 0 12 0 12 ns 32
Minimum time clocks remains ON after CKE asynchronously
drops LOW
tDelay tIS+tCK+tIH
x tIS+tCK+tIH xns 15