W3EG6432S-D3 Datasheet, PDF (7/13 Pages) White Electronic Designs Corporation – 256MB - 32Mx64 DDR SDRAM UNBUFFERED

White Electronic Designs
W3EG6432S-D3
-JD3
PRELIMINARY
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND
RECOMMENDED AC OPERATING CONDITIONS
AC CHARACTERISTICS
PARAMETER
Access window of DQs from CK/CK#
CK high-level width
CK low-level width
Clock cycle time
CL = 3
CL = 2.5
CL = 2
DQ and DM input hold time relative to DQS
DQ and DM input setup time relative to DQS
DQ and DM input pulse width (for each input)
Access window of DQS from CK/CK#
DQS input high pulse width
DQS input low pulse width
DQS-DQ skew, DQS to last DQ valid, per group, per
access
Write command to first DQS latching transition
DQS falling edge to CK rising - setup time
DQS falling edge from CK rising - hold time
Half clock period
Data-out high-impedance window from CK/CK#
Data-out low-impedance window from CK/CK#
Address and control input hold time (fast slew rate)
Address and control input setup time (fast slew rate)
Address and control input hold time (slow slew rate)
403
335
262
263/265
202
SYMBOL MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX UNITS NOTES
tAC -0.7 +0.7 -0.7 +0.7 -0.75 +0.75 -0.75 +0.75 -0.75 +0.75 ns
tCH 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 tCK 26
tCL 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 tCK 26
tCK (3)
5 7.5
ns 40, 45
tCK (2.5) 6 13 6 13 7.5 13 7.5 13 7.5 13 ns 40, 45
tCK (2) 7.5 13 7.5 13 7.5/10 13 7.5/10 13 7.5/10 13 ns 40, 45
tDH
0.4
0.45
0.5
0.5
0.5
ns 23, 27
tDS
0.4
0.45
0.5
0.5
0.5
ns 23, 27
tDIPW 1.75
1.75
1.75
1.75
1.75
ns 27
tDQSCK -0.60 +0.60 -0.60 +0.60 -0.75 +0.75 -0.75 +0.75 -0.75 +0.75 ns
tDQSH 0.35
0.35
0.35
0.35
0.35
tCK
tDQSL 0.35
0.35
0.35
0.35
0.35
tCK
tDQSQ
0.40
0.45
0.5
0.5
0.5 ns 22, 23
tDQSS 0.72 1.28 0.75 1.25 0.75 1.25 0.75 1.25 0.75 1.25 tCK
tDSS
0.2
0.2
0.2
0.2
0.2
tCK
tDSH
0.2
0.2
0.2
0.2
0.2
tCK
tHP
tCH,tCL
tCH,tCL
tCH,tCL
tCH,tCL
tCH,tCL
ns 30
tHZ
+0.70
+0.70
+0.75
+0.75
+0.75 ns 16, 36
tLZ -0.70
-0.70
-0.75
-0.75
-0.75
ns 16, 36
tIHF
0.6
0.75
0.90
.90
.90
ns 12
tISF
0.6
0.75
0.90
.90
.90
ns 12
tIHS
0.6
0.80
1
1
1
ns 12
May 2005
Rev. 6
7
White Electronic Designs Corporation • [phone] • www.wedc.com