w9425g8eh Winbond Electronics Corp America, w9425g8eh Datasheet - Page 27

• Manufacturer Part Number: w9425g8eh
• Description: 8m ? 4 Banks ? 8 Bits Ddr Sdram
• Manufacturer: Winbond Electronics Corp America

AC Characteristics and Operating Condition, continued
9.7
Input High Voltage (AC)
Input Low Voltage (AC)
Input Reference Voltage
Termination Voltage
Differential Clock Input Reference Voltage
Input Difference Voltage. CLK and CLK Inputs (AC)
Output Timing Measurement Reference Voltage
t
t
t
t
t
SYM.
t
WPRE
WPST
t
t
t
DQSS
XSNR
XSRD
t
T(SS)
WTR
REFi
MRD
t
IPW
t
t
t
t
t
HZ
LZ
IS
IH
IS
IH
AC Test Conditions
DQS Write Preamble Time
DQS Write Postamble Time
Write Command to First DQS Latching
Transition
Input Setup Time (fast slew rate)
Input Hold Time (fast slew rate)
Input Setup Time (slow slew rate)
Input Hold Time (slow slew rate)
Control & Address Input Pulse Width (for each
input)
Data-out
CLK, CLK
Data-out
CLK, CLK
SSTL Input Transition
Internal Write to Read Command Delay
Exit Self Refresh to non-Read Command
Exit Self Refresh to Read Command
Refresh Interval Time (8k/ 64mS)
Mode Register Set Cycle Time
High-impedance
Low-impedance
PARAMETER
PARAMETER
Time
Time
from
from
- 27 -
0.25
0.72
MIN.
-0.7
-0.7
200
0.4
0.6
0.6
0.7
0.7
2.2
0.5
75
10
2
-5
MAX.
1.25
0.6
0.7
0.7
1.5
7.8
SYMBOL
V
0.25
0.75
0.75
0.75
MIN.
-0.7
-0.7
200
0.4
0.8
0.8
2.2
0.5
75
12
V
V
1
ID (AC)
V
V
V
V
OTR
REF
TT
IH
IL
R
-6
Publication Release Date: Jul. 04
MAX.
1.25
0.6
0.7
0.7
1.5
7.8
-0.75
-0.75
0.25
0.75
MIN.
200
V
0.4
0.9
0.9
1.0
1.0
2.2
0.5
V
75
15
0.5 x V
0.5 x V
0.5 x V
1
REF
REF
VALUE
V
-75
x (AC)
1.5
+ 0.31
- 0.31
MAX.
1.25
0.75
0.75
0.6
1.5
7.8
DDQ
DDQ
DDQ
UNIT
t
nS
t
nS
t
µS
nS
CK
CK
CK
Revision A01
UNIT
19, 21-23
19, 21-23
V
V
V
V
V
V
V
20-23
20-23
NOTES
,
11
17
2008