![](http://datasheet.mmic.net.cn/390000/MT46V64M8_datasheet_16823573/MT46V64M8_49.png)
49
512Mb: x4, x8, x16 DDR SDRAM
512Mx4x8x16DDR_A.p65
–
Rev. A; Pub 10/00
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2000, Micron Technology, Inc.
512Mb: x4, x8, x16
DDR SDRAM
ADVANCE
DQS write preamble
DQS write preamble setup time
DQS write postamble
Write recovery time
Internal WRITE to READ command delay
Data valid output window (DVW)
REFRESH to REFRESH command interval
Average periodic refresh interval
Terminating voltage delay to V
DD
Exit SELF REFRESH to non-READ command
Exit SELF REFRESH to READ command
t
WPRE
t
WPRES
t
WPST
t
WR
t
WTR
na
t
REFC
t
REFI
t
VTD
t
XSNR
t
XSRD
0.25
0
0.4
15
1
t
QH -
t
DQSQ
0.25
0
0.4
15
1
t
QH -
t
DQSQ
0.25
0
0.4
15
1
t
QH -
t
DQSQ
t
CK
ns
t
CK
ns
t
CK
ns
μs
μs
ns
ns
t
CK
20, 21
19
0.6
0.6
0.6
25
23
23
70.3
7.8
70.3
7.8
70.3
7.8
0
75
200
0
75
200
0
80
200
ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS
(Notes: 1
–
5, 14-17, 33; notes appear on pages 50
–
53) (0
°
C
≤
T
A
≤
+70
°
C; V
DD
Q = +2.5V ±0.2V, V
DD
= +2.5V ±0.2V)
AC CHARACTERISTICS - Continued
PARAMETER
-7
-75
-8
SYMBOL
MIN
MAX
MIN
MAX
MIN
MAX
UNITS NOTES
SLEW RATE DERATING VALUES
(Note: 14; notes appear on pages 50
–
53) (0
°
C
≤
T
A
≤
+70
°
C; V
DD
Q = +2.5V ±0.2V, V
DD
= +2.5V ±0.2V)
ADDRESS / COMMAND
t
IS
1
1.05
1.10
1.15
1.1
1.15
1.20
1.25
SPEED
-7, -75
-7, -75
-7, -75
-7, -75
-8
-8
-8
-8
SLEW RATE
0.500V / ns
0.400V / ns
0.300V / ns
0.200V / ns
0.500V / ns
0.400V / ns
0.300V / ns
0.200V / ns
t
IH
1
1
1
1
1.1
1.1
1.1
1.1
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
SLEW RATE DERATING VALUES
(Note: 31; notes appear on pages 50
–
53) (0
°
C
≤
T
A
≤
+70
°
C; V
DD
Q = +2.5V ±0.2V, V
DD
= +2.5V ±0.2V)
Data, DM, DQS
t
DS
0.50
0.55
0.60
0.65
0.60
0.65
0.70
0.75
SPEED
-7, -75
-7, -75
-7, -75
-7, -75
-8
-8
-8
-8
SLEW RATE
0.500V / ns
0.400V / ns
0.300V / ns
0.200V / ns
0.500V / ns
0.400V / ns
0.300V / ns
0.200V / ns
t
DH
0.50
0.55
0.60
0.65
0.60
0.65
0.70
0.75
UNITS
ns
ns
ns
ns
ns
ns
ns
ns