W3EG72256S-JD3 Datasheet, PDF (8/14 Pages) White Electronic Designs Corporation – 2GB-256Mx72 DDR SDRAM REGISTERED ECC w/PLL

White Electronic Designs
W3EG72256S-JD3
-AJD3
PRELIMINARY
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND
RECOMMENDED AC OPERATING CONDITIONS
0°C ≤ TA ≤ +70°C; VCC = +2.5V ±0.2V, VCCQ = +2.5V ±0.2V
AC Characteristics
Parameter
Access window of DQs from CK, CK#
CK high-level width
CK low-level width
Clock cycle time
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 set-up time (fast slew rate)
Address and control input hold time (slow slew rate)
Address and control input setup time (slow slew rate)
Address and control input pulse width (for each input)
LOAD MODE REGISTER command cycle time
DQ-DQS hold, DQS to first DQ to go non-valid, per access
Data hold skew factor
ACTIVE to PRECHARGE command
ACTIVE to READ with Auto precharge command
ACTIVE to ACTIVE/AUTO REFRESH command period
AUTO REFRESH command period
Symbol
tAC
tCH
tCL
tCK (2.5)
tCK (2)
tDH
tDS
tDIPW
tDQSCK
tDQSH
tDQSL
tDQSQ
tDQSS
tDSS
tDSH
tHP
tHZ
tLZ
tIHf
tISf
tIHs
tISs
tIPW
tMRD
tQH
tQHS
tRAS
tRAP
tRC
tRFC
335
Min Max
-0.7 +0.7
0.45 0.55
0.45 0.55
6
13
7.5
13
0.45
0.45
1.75
-0.60 +0.60
0.35
0.35
0.45
0.75 1.25
0.2
0.2
tCH, tCL
+0.70
-0.70
0.75
0.75
0.80
0.80
2.2
12
tHP-tQHS
0.55
42 70,000
15
60
75
262/263/265
Min Max
-0.75 +0.75
0.45 0.55
0.45 0.55
7.5
13
7.5
13
0.5
0.5
1.75
-0.75 +0.75
0.35
0.35
0.5
0.75 1.25
0.2
0.2
tCH, tCL
+0.75
-0.75
0.90
0.90
1
1
2.2
15
tHP-tQHS
0.75
40 120,000
15
65
75
202
Min Max
-0.8 +0.8
0.45 0.55
0.45 0.55
8
13
10
13
0.6
0.6
2
-0.8 +0.8
0.35
0.35
0.5
0.75 1.25
0.2
0.2
tCH, tCL
+0.8
-0.8
1.1
1.1
1.1
1.1
2.2
16
tHP-tQHS
0.75
40 120,000
15
70
75
Units
ns
tCK
tCK
ns
ns
ns
ns
ns
ns
tCK
tCK
ns
tCK
tCK
tCK
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes
16
16
22
22
14,17
14,17
17
13,14
18
8,19
8,20
6
6
6
6
13,14
15
21
December 2004
Rev. 2
8
White Electronic Designs Corporation • [phone] • www.wedc.com