White Electronic Designs
WEDPN4M72V-XB2X
ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CHARACTERISTICS
(NOTES 5, 6, 8, 9, 11)
Parameter
Access time from CK (pos. edge)
Address hold time
Address setup time
CK high-level width
CK low-level width
Clock cycle time (22)
CKE hold time
CKE setup time
CS#, RAS#, CAS#, WE#, DQM hold time
CS#, RAS#, CAS#, WE#, DQM setup time
Data-in hold time
Data-in setup time
Data-out high-impedance time
CL = 3 (10)
CL = 2 (10)
CL = 3
CL = 2
CL = 3
CL = 2
Symbol
t
AC
t
AC
t
AH
t
AS
t
CH
t
CL
t
CK
t
CK
t
CKH
t
CKS
t
CMH
t
CMS
t
DH
t
DS
t
HZ
t
HZ
t
LZ
t
OH
t
OHN
t
RAS
t
RC
t
RCD
t
REF
t
REF
t
RFC
t
RP
t
RRD
t
T
t
WR
t
XSR
-100
Min
Max
7
7
Min
-125
Max
6
6
Min
-133
Max
5.5
6
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ms
ns
ns
ns
ns
—
ns
ns
1
2
3
3
10
13
1
2
1
2
1
2
7
7
1
3
1.8
50
70
20
1
2
3
3
8
10
1
2
1
2
1
2
6
6
1
3
1.8
45
68
20
0.8
1.5
2.5
2.5
7.5
10
0.8
1.5
0.8
1.5
0.8
1.5
5.5
6
1
3
1.8
50
68
20
Data-out low-impedance time
Data-out hold time (load)
Data-out hold time (no load) (26)
ACTIVE to PRECHARGE command
ACTIVE to ACTIVE command period
ACTIVE to READ or WRITE delay
Refresh period (4,096 rows) – Commercial, Industrial
Refresh period (4,096 rows) – Military
AUTO REFRESH period
PRECHARGE command period
ACTIVE bank A to ACTIVE bank B command
Transition time (7)
(23)
WRITE recovery time
(24)
Exit SELF REFRESH to ACTIVE command
120,000
120,000
120,000
64
16
70
20
20
0.3
1 CK +
7ns
15
80
70
20
20
0.3
1 CK +
7ns
15
80
64
16
70
20
15
0.3
1 CK +
7.5ns
15
75
64
16
1.2
1.2
1.2
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
January 2005
Rev. 2
11
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
