W3HG2128M72ACER-AD6 Datasheet, PDF (7/13 Pages) White Electronic Designs Corporation – 2GB - 2x128Mx72 DDR2 SDRAM REGISTERED, w/PLL, VLP

White Electronic Designs ^{W3HG2128M72ACER-AD6}
PRELIMINARY
AC TIMING PARAMETERS (Continued)
0°C ≤ TCASE < +85°C; VCCQ = + 1.8V ± 0.1V, VCC = +1.8V ± 0.1V
AC CHARACTERISTICS
806
665
534
PARAMETER
SYMBOL MIN MAX MIN MAX MIN MAX
DQS read preamble
tRPST
TBD
TBD
0.4
0.6
0.4
0.6
DQS write preamble setup time ^tWPRES
TBD
TBD
0
0
403
MIN MAX
0.4
0.6
0
DQS write preamble
tWPRE
TBD
TBD
0.35
0.25
DQS write postamble
tWPST
TBD
TBD
0.4
0.6
0.4
0.6
Write command to first DQS
latching transition
tDQSS
TBD
WL-
TBD
0.25
WL-
0.25
Address and control input
pulse width for each input
tIPW
TBD
TBD
0.6
0.6
Address and control input
setup time
tISa
TBD
TBD
400
500
Address and control input
hold time
tIHa
TBD
TBD
400
500
Address and control input
setup time
tISb
TBD
TBD
200
250
Address and control input
hold time
tIHb
TBD
TBD
275
375
CAS# to CAS# command
delay
tCCD
TBD
TBD
2
2
Active to Active (same bank)
command
tRC
TBD
TBD
55
55
Active bank a to Active b bank
command
tRRD
TBD
TBD
7.5
7.5
Active to Read or Write delay
tRCD
TBD
TBD
15
15
Four Bank Activate period
tFAW
TBD
TBD
37.5
37.5
Active to precharge command
tRAS
TBD
TBD
40 70,000 40 70,000
Internal Read to precharge
command delay
tRTP
TBD
TBD
7.5
7.5
Write recovery time
tWR
TBD
TBD
15
15
Auto precharge write recovery
and precharge time
tDAL
TBD
TBD
tWR+tRP
tWR+tRP
Interval Write to Read
command delay
tWTR
TBD
TBD
10
7.5
Precharge command period
tRP
TBD
TBD
15
15
Precharge All command period tRPA
TBD
TBD
tRP+tCK
tRP+tCK
Load Mode command cycle
time
tMRD
TBD
TBD
2
2
CKE low to CK,CK#
uncertainty
tDELAY
TBD
TBD
tIS+tCK+tIH
tIS+tCK+tIH
NOTE:
• AC specification is based on MICRON components. Other DRAM manufactures specification may be different.
0.25
0.4
0.6
WL-
0.25
0.6
600
600
350
475
2
55
7.5
15
37.5
40 70,000
7.5
15
tWR+tRP
10
15
tRP+tCK
2
tIS+tCK+tIH
UNIT
tCK
ps
tCK
tCK
tCK
tCK
ps
ps
ps
ps
tCK
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tCK
ns
Notes
35
12, 13,
36
11
6, 21
6, 21
6, 21
6, 21
33
27
30
20, 33
23, 27
27
22
27
31
31
28
May 2006
Rev. 5
7
White Electronic Designs Corporation • [phone] • www.wedc.com