w3e16m64s-xbx White Electronic Designs Corporation, w3e16m64s-xbx Datasheet - Page 12

• Manufacturer Part Number: w3e16m64s-xbx
• Description: 16mx64 Sdram
• Manufacturer: White Electronic Designs Corporation

February 2005
Rev. 4
Parameter
Access window of DQs from CLK/CLK#
CLK high-level width (30)
CLK low-level width (30)
Clock cycle time
DQ and DM input hold time relative to DQS (26, 31)
DQ and DM input setup time relative to DQS (26, 31)
DQ and DM input pulse width (for each input) (31)
Access window of DQS from CLK/CLK
DQS input high pulse width
DQS input low pulse width
DQS-DQ skew, DQS to last DQ valid, per group, per access (25, 26)
Write command to fi rst DQS latching transition
DQS falling edge to CLK rising - setup time
DQS falling edge from CLK rising - hold time
Half clock period (34)
Data-out high-impedance window from CLK/CLK (18, 42)
Data-out low-impedance window from CLK/CLK (18, 43)
Address and control input hold time (fast slew rate) (14)
Address and control input setup time (fast slew rate) (14)
Address and control input hold time (slow slew rate) (14)
Address and control input setup time (slow slew rate) (14)
LOAD MODE REGISTER command cycle time
DQ-DQS hold, DQS to fi rst DQ to go non-valid, per access (25, 26)
Data hold skew factor
ACTIVE to PRECHARGE command (35)
ACTIVE to READ with Auto precharge command (46)
ACTIVE to ACTIVE/AUTO REFRESH command period
AUTO REFRESH command period (50)
ACTIVE to READ or WRITE delay
PRECHARGE command period
DQS read preamble (42)
DQS read postamble
ACTIVE bank a to ACTIVE bank b command
DQS write preamble
DQS write preamble setup time (20, 21)
DQS write postamble (19)
Write recovery time
Internal WRITE to READ command delay
Data valid output window (25)
REFRESH to REFRESH command interval (23)
Average periodic refresh interval (23)
Terminating voltage delay to VDD
Exit SELF REFRESH to non-READ command
Exit SELF REFRESH to READ command
ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CHARACTERISTICS
White Electronic Designs
CL = 2.5 (45, 52)
CL = 2 (45, 52)
(Notes 1-5, 14-17, 33)
Symbol
t
12
CK
t
t
t
t
CK
DQSCK
t
t
t
t
WPRES
t
t
t
t
t
t
t
t
t
WPRE
t
t
DQSH
DQSQ
DQSS
t
t
t
t
t
t
RPRE
t
WPST
REFC
t
XSNR
XSRD
DIPW
DQSL
t
t
RPST
t
t
t
t
t
t
t
t
MRD
t
QHS
t
RCD
t
RRD
WTR
REFI
t
DSS
DSH
t
t
RAS
RAP
RFC
na
VTD
IH F
IH S
IS S
WR
AC
CH
DH
DS
HP
HZ
IS F
QH
RC
RP
CL
(2.5)
LZ
(2)
t
t
HP
266 Mbps CL 2.5
-0.75
-0.75
CH
-0.75
0.45
0.45
1.75
0.35
0.35
0.75
0.90
0.90
0.25
200 Mbps CL 2
Min
200
7.5
0.5
0.5
0.2
0.2
0.9
0.4
0.4
10
15
40
20
65
75
20
20
15
15
75
-t
1
1
0
1
0
,t
QHS
t
CL
QH
White Electronic Designs Corporation • [phone] • www.wedc.com
- t
DQSQ
120,000
+0.75
+0.75
+0.75
Max
0.55
0.55
1.25
0.75
70.3
0.5
1.1
0.6
0.6
7.8
13
13
t
t
HP
250 Mbps CL2.5
CH
0.45
0.45
0.35
0.35
0.75
0.25
Min
-0.8
-0.8
-0.8
200
200 Mbps CL2
0.6
0.6
0.2
0.2
1.1
1.1
1.1
1.1
0.9
0.4
0.4
10
16
40
20
70
80
20
20
15
15
80
-t
8
2
0
1
0
,t
QHS
t
CL
QH
- t
W3E16M64S-XBX
DQSQ
120,000
Max
+0.8
0.55
0.55
+0.8
1.25
+0.8
70.3
0.6
1.1
0.6
0.6
7.8
13
13
1
t
HP
t
200 Mbps CL2.5
CH
0.45
0.45
0.35
0.35
0.75
0.25
Min
-0.8
-0.8
-0.8
200
150 Mbps CL2
0.6
0.6
0.2
0.2
1.1
1.1
1.1
1.1
0.9
0.4
0.4
10
13
16
40
20
70
80
20
20
15
15
80
-t
2
0
1
0
,t
QHS
t
CL
QH
- t
DQSQ
120,000
Max
+0.8
0.55
0.55
+0.8
1.25
+0.8
70.3
0.6
1.1
0.6
0.6
7.8
13
15
1
Units
t
t
t
t
t
t
t
t
t
t
t
t
µs
µs
t
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK