White Electronic Designs
WED3EG7233S-D3
-JD3
ADVANCED
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND
RECOMMENDED AC OPERATING CONDITIONS
0°C ≤ T
A
≤ +70°C; V
CC
= +2.5V ± 0.2V, V
CCQ
= +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
t
AC
t
CH
t
CL
t
CK
(2.5)
t
CK
(2)
t
DH
t
DS
t
DIPW
t
DQSCK
t
DQSH
t
DQSL
t
DQSQ
t
DQSS
t
DSS
t
DSH
t
HP
t
HZ
t
LZ
t
IHf
t
ISf
t
IHs
t
ISs
t
IPW
t
MRD
t
QH
t
QHS
t
RAS
t
RAP
t
RC
t
RFC
45
20
65
75
-0.75
0.90
0.90
1
1
2.2
15
t
HP
-t
QHS
0.75
120,000
45
20
65
75
0.75
0.2
0.2
t
CH
, t
CL
+0.75
-0.75
0.90
0.90
1
1
2.2
15
t
HP
-t
QHS
0.75
120,000
Min
-0.75
0.45
0.45
7.5
7.5
0.5
0.5
1.75
-0.75
0.35
0.35
0.5
1.25
0.75
0.2
0.2
t
CH
, t
CL
+0.75
+0.75
262
Max
+0.75
0.55
0.55
13
13
Min
-0.75
0.45
0.45
7.5
10
0.5
0.5
1.75
-0.75
0.35
0.35
0.5
1.25
+0.75
265, 202
Max
+0.75
0.55
0.55
13
13
Units
ns
t
CK
t
CK
ns
ns
ns
ns
ns
ns
t
CK
t
CK
ns
t
CK
t
CK
t
CK
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
21
15
13,14
18
8,19
8,20
6
6
6
6
13,14
16
16
22
22
14,17
14,17
17
Notes
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May, 2005
Rev. 0
7
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
