W3DG7232V-D2 Datasheet, PDF (6/9 Pages) White Electronic Designs Corporation – 256MB - 32Mx72 SDRAM, REGISTER and SPD, w/PLL

White Electronic Designs
W3DG7232V-D2
PRELIMINARY
AC FUNCTIONAL CHARACTERISTICS
VCC, VCCQ = +3.3V ±0.3V
PARAMETER
SYMBOL
7
7.5
READ/WRITE command to READ/WRITE command
tCCD
1
1
CKE to clock disable or power-down entry mode
tCKED
1
1
CKE to clock enable or power-down exit setup mode
tPED
1
1
DQM to input data delay
tDQD
0
0
DQM to data mask during WRITEs
tDQM
0
0
DQMto data high-impedance during READs
tDQZ
2
2
WRITE command to input data delay
tDWD
0
0
Data-into ACTIVE command
tDAL
4
5
Data-into PRECHARGE command
tDPL
2
2
Last data-in to burst STOP command
tBDL
1
1
Last data-in to new READ/WRITE command
tCDL
1
1
Lastdata-into PRECHARGE command
tRDL
2
2
LOADMODEREGISTER command to ACTIVE or REFRESH command
tMRD
2
2
Data-out to high-impedance from PRECHARGE command
CL = 3
tROH(3)
3
3
CL = 2
tROH(2)
2
2
10
UNITS NOTES
1
tCK
17
1
tCK
14
1
tCK
14
0
tCK
17
0
tCK
17
2
tCK
17
0
tCK
17
5
tCK
15, 21
2
tCK
16, 21
1
tCK
17
1
tCK
17
2
tCK
16, 21
2
tCK
26
3
tCK
17
2
tCK
17
February 2005
Rev. 1
6
White Electronic Designs Corporation • [phone] • www.wedc.com