W3HG64M72EER-AD7 Datasheet, PDF (9/14 Pages) White Electronic Designs Corporation – 512MB - 64Mx72 DDR2 SDRAM REGISTERED, w/PLL, VLP Mini-DIMM

White Electronic Designs
W3HG64M72EER-AD7
ADVANCED
AC TIMING PARAMETERS (Continued)
0°C ≤ TCASE < +85°C; VCCQ = + 1.8V ± 0.1V, VCC = +1.8V ± 0.1V
AC CHARACTERISTICS
806
665
534
403
PARAMETER
SYMBOL MIN MAX MIN MAX MIN
Refresh to Active or Refresh to
Refresh command interval
tRFC
TBD
TBD
105 70,000 105
Average periodic refresh
interval
tREFI
TBD
TBD
200
7.8
Exit self refresh to non-read
command
tXSNR
TBD
tRFC
TBD
(MIN)+10
tRFC
(MIN)+10
Exit self refresh to read
command
tXSRD
TBD
TBD
200
200
Exit self refresh timing
reference
tISXR
TBD
TBD
tIS
tIS
ODT turn-on delay
tAOND
TBD
TBD
2
2
2
ODT turn-on
tAON
TBD
TBD
tAC(MIN) ^tAC(MAX) tAC(MIN)
+700
ODT turn-off delay
tAOFD
TBD
TBD
2.5
2.5
2.5
ODT turn-off
tAOF
TBD
TBD
tAC(MIN) ^tAC(MAX) tAC(MIN)
+600
ODT turn-on (power-down
mode)
tAONPD
TBD
tAC(MIN) ^{2x tCK +} tAC(MIN)
TBD
tAC (MAX)
+2,000 _{+ 1,000} +2,000
ODT turn-off (power-down
mode)
tAOFPD
TBD
tAC(MIN) ^{2x tCK +} tAC(MIN)
TBD
tAC (MAX)
+2,000 _{+ 1,000} +2,000
ODT to power-down entry
latency
tANPD
TBD
TBD
3
3
ODT power-down exit latency
tAXPD
TBD
TBD
8
8
Exit active power-down to
READ command, MR[bit12=0]
tXARD
TBD
TBD
2
2
Exit active power-down to
READ command, MR[bit12=1]
tXARDS
TBD
TBD
7-AL
6-AL
Exit precharge power-down to
any non-READ command.
tXP
TBD
TBD
2
2
CKE minimum high/low time
tCKE
TBD
TBD
3
3
NOTE:
• AC specification is based on MICRON components. Other DRAM manufactures specification may be different.
MAX
70,000
7.8
2
tAC(MAX)
+1,000
2.5
tAC(MAX)
+600
2x tCK +
tAC (MAX)
+ 1,000
2x tCK +
tAC (MAX)
+ 1,000
MIN
105
tRFC
(MIN)+10
200
tIS
2
tAC(MIN)
2.5
tAC(MIN)
tAC(MIN)
+2,000
tAC(MIN)
+2,000
3
8
2
6-AL
2
3
MAX
70,000
7.8
2
tAC(MAX)
+1,000
2.5
tAC(MAX)
+600
2x tCK +
tAC (MAX)
+ 1,000
2x tCK +
tAC (MAX)
+ 1,000
UNIT
ns
µs
ns
tCK
ps
tCK
ps
tCK
ps
ps
tCK
tCK
tCK
tCK
tCK
tCK
tCK
Notes
14
14
6, 29
25
26
34
December 2005
Rev. 1
9
White Electronic Designs Corporation • [phone] • www.wedc.com