W9425G8EH Datasheet, PDF (27/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
AC Characteristics and Operating Condition, continued
SYM.
PARAMETER
-5
-6
-75
MIN. MAX. MIN. MAX. MIN. MAX.
tWPRE DQS Write Preamble Time
0.25
0.25
0.25
tWPST DQS Write Postamble Time
0.4 0.6 0.4 0.6 0.4 0.6
tDQSS
Write Command
Transition
to
First
DQS
Latching
0.72
1.25
0.75
1.25
0.75
1.25
tIS
Input Setup Time (fast slew rate)
tIH
Input Hold Time (fast slew rate)
0.6
0.75
0.9
0.6
0.75
0.9
tIS
Input Setup Time (slow slew rate)
tIH
Input Hold Time (slow slew rate)
0.7
0.8
1.0
0.7
0.8
1.0
tIPW
Control & Address Input Pulse Width (for each
input)
2.2
2.2
2.2
Data-out High-impedance Time from
tHZ
-0.7 0.7 -0.7 0.7 -0.75 0.75
CLK, CLK
Data-out Low-impedance Time from
tLZ
-0.7 0.7 -0.7 0.7 -0.75 0.75
CLK, CLK
tT(SS)
tWTR
SSTL Input Transition
Internal Write to Read Command Delay
0.5 1.5 0.5 1.5 0.5 1.5
2
1
1
tXSNR
tXSRD
tREFi
Exit Self Refresh to non-Read Command
Exit Self Refresh to Read Command
Refresh Interval Time (8k/ 64mS)
75
75
75
200
200
200
7.8
7.8
7.8
tMRD Mode Register Set Cycle Time
10
12
15
UNIT NOTES
tCK
11
19, 21-23
19, 21-23
20-23
20-23
nS
tCK
nS
tCK
µS
17
nS
9.7 AC Test Conditions
PARAMETER
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
SYMBOL
VIH
VIL
VREF
VTT
VR
VID (AC)
VOTR
VALUE
VREF + 0.31
VREF - 0.31
0.5 x VDDQ
0.5 x VDDQ
Vx (AC)
1.5
0.5 x VDDQ
UNIT
V
V
V
V
V
V
V
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Publication Release Date: Jul. 04, 2008
Revision A01