White Electronic Designs
V
CC
= 3.3V ±0.3V, 0°C ≤ T
A
≤ +70°C
AC CHARACTERISTICS
PARAMETER
Access time from CLK (pos. edge)
CL = 3
CL = 2
Address hold time
Address setup time
CLK high-level width
CLK low-level width
Clock cycle time
CL = 3
CL = 2
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
CL = 2
Data-out low-impedance time
Data-out hold time (load)
Data-out hold time (no load)
ACTIVE to PRECHARGE command
ACTIVE to ACTIVE command period
ACTIVE to READ or WRITE delay
Refresh period (8,192 rows)
AUTO REFRESH period
PRECHARGE command period
ACTIVE bank a to ACTIVE bank b command
Transition time
WRITE recovery time
SYMBOL
t
AC(3)
t
AC(2)
t
AH
t
AS
t
CH
t
CL
t
CK(3)
t
CK(2)
t
CKH
t
CKS
t
CMH
t
CMS
t
DH
t
DS
t
HZ(3)
t
HZ(2)
t
LZ
t
OH
t
OHN
t
RAS
t
RC
t
RCD
t
REF
t
RFC
t
RP
t
RRD
t
T
t
WR
66
15
14
0.3
1 CLK +
7ns
14
Exit SELF REFRESH to ACTIVE command
t
XSR
67
1.2
1
2.7
1.8
37
60
15
64
120K
0.8
1.5
2.5
2.5
7
7.5
0.8
1.5
0.8
1.5
0.8
1.5
5.4
5.4
MIN
7
MAX
5.4
5.4
WED3DG7264V-D1
PRELIMINARY
ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS
75/10
MIN
MAX
5.4
6
0.8
1.5
2.5
2.5
7.5
10
0.8
1.5
0.8
1.5
0.8
1.5
5.4
6
1
2.7
1.8
44
66
20
64
66
20
15
0.3
1 CLK +
7ns
15
75
1.2
120K
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ns
-
ns
ns
7
24
14, 25
20
28
10
10
23
23
NOTES
27
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
July 2005
Rev. 4
5
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
