Shivaki STV-24LEDGR7, Руководство по обслуживанию

Страница: 78 / 175

K4T51163QI
datasheet
DDR2 SDRAM
Rev. 1.0
K4T51083QI
K4T51043QI
Parameter Symbol
DDR2-1066 DDR2-800 DDR2-667
Units
NOTE
min max min max min max
Four Activate Window for 1KB page size products tFAW 35 x 35 x 37.5 x ns 32
Four Activate Window for 2KB page size products tFAW 45 x 45 x 50 x ns 32
CAS to CAS command delay tCCD 2 x 2 x 2 x nCK
Write recovery time tWR 15 x 15 x 15 x ns 32
Auto precharge write re precharge time tDAL WR+tRP x WR + tnRP x WR + tnRP x nCK 33
Internal write to read command delay tWTR 7.5 x 7.5 x 7.5 x ns 24,32
Internal read to precharge command delay tRTP 7.5 x 7.5 x 7.5 x ns 3,32
Exit self refresh to a non-read command tXSNR tRFC + 10 x tRFC + 10 x tRFC + 10 x ns 32
Exit self refresh to a read command tXSRD 200 x 200 x 200 x nCK
Exit precharge power down to any command tXP 3 x 2 x 2 x nCK
Exit active power down to read command tXARD 3 x 2 x 2 x nCK 1
Exit active power down to read command
(slow exit, lower power)
tXARDS 10 - AL x 8 - AL x 7 - AL x nCK 1,2
CKE minimum pulse width (HIGH and LOW pulse width) tCKE 3 x 3 x 3 x nCK 27
ODT turn-on delay tAOND 2 2 2 2 2 2 nCK 16
ODT turn-on tAON tAC(min)
tAC(max) +
2.575
tAC(min)
tAC(max)+
0.7
tAC(min)
tAC(max)+
0.7
ns 6,16,40
ODT turn-on (Power-Down mode) tAONPD tAC(min)+2
3*tCK +
tAC(max)+
1
tAC(min)+2
2*tCK(avg)
+tAC(max)
+1
tAC(min)+2
2*tCK(avg)
+tAC(max)
+1
ns
ODT turn-off delay tAOFD 2.5 2.5 2.5 2.5 2.5 2.5 nCK 17,45
ODT turn-off tAOF tAC(min)
tAC(max)+
0.6
tAC(min)
tAC(max)+
0.6
tAC(min)
tAC(max)+
0.6
ns
17,43,4
5
ODT turn-off (Power-Down mode) tAOFPD tAC(min)+2
2.5*tCK +
tAC(max)+
1
tAC(min)+2
2.5*tCK(av
g)+tAC(ma
x)+1
tAC(min)+2
2.5*tCK(av
g)+tAC(ma
x)+1
ns
ODT to power down entry latency tANPD 4 x 3 x 3 x nCK
ODT power down exit latency tAXPD 11 x 8 x 8 x nCK
OCD drive mode output delay tOIT 0 12 0 12 0 12 ns 32
Minimum time clocks remains ON after CKE asynchronously
drops LOW
tDelay
tIS+tCK
+tIH
x
tIS+tCK(av
g)
+tIH
x
tIS+tCK(av
g)
+tIH
x ns 15
Page 62 of 152