W9425G8EH Datasheet, PDF (30/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
10. SYSTEM CHARACTERISTICS FOR DDR SDRAM
The following specification parameters are required in systems using DDR400, DDR333 & DDR266
devices to ensure proper system performance. These characteristics are for system simulation
purposes and are guaranteed by design.
10.1 Table 1: Input Slew Rate for DQ, DQS, and DM
AC CHARACTERISTICS
PARAMETER
DQ/DM/DQS input slew rate
measured between VIH(DC),
VIL(DC) and VIL(DC), VIH(DC)
DDR400
DDR333
DDR266
SYMBOL MIN. MAX. MIN. MAX. MIN. MAX. UNIT NOTES
DCSLEW 0.5 4.0 0.5 4.0 0.5 4.0 V/nS a, m
10.2 Table 2: Input Setup & Hold Time Derating for Slew Rate
INPUT SLEW RATE
ΔtIS
ΔtIH
UNIT
0.5 V/nS
0
0
pS
0.4 V/nS
+50
0
pS
0.3 V/nS
+100
0
pS
NOTES
i
i
i
10.3 Table 3: Input/Output Setup & Hold Time Derating for Slew Rate
INPUT SLEW RATE
0.5 V/nS
0.4 V/nS
0.3 V/nS
ΔtDS
0
+75
+150
ΔtDH
0
0
0
UNIT
pS
pS
pS
NOTES
k
k
k
10.4 Table 4: Input/Output Setup & Hold Derating for Rise/Fall Delta Slew Rate
INPUT SLEW RATE
±0.0 nS/V
±0.25 nS/V
±0.5 nS/V
ΔtDS
0
+50
+100
ΔtDH
0
0
0
UNIT
pS
pS
pS
NOTES
j
j
j
10.5 Table 5: Output Slew Rate Characteristics (X8 Devices only)
SLEW RATE
CHARACTERISTIC
Pullup Slew Rate
Pulldown Slew Rate
TYPICAL
RANGE (V/NS)
1.2 ~ 2.5
1.2 ~ 2.5
MINIMUM
(V/NS)
1.0
1.0
MAXIMUM
(V/NS)
4.5
4.5
NOTES
a, c, d, f, g, h
b, c, d, f, g, h
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Publication Release Date: Jul. 04, 2008
Revision A01