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W9425G6EH
10. SYSTEM CHARACTERISTICS FOR DDR SDRAM
The following specification parameters are required in systems using DDR500, DDR400 & DDR333
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 D M
AC CHARACTERISTICS
PARAMETER
SYMBOL
DDR500
MIN. MAX.
DDR400
MIN. MAX.
DDR333
MIN. MAX.
UNIT NOTES
DQ/DM/DQS input slew rate
measured between V IH(DC) ,
DCSLEW
0.5
4.0
0.5
4.0
0.5
4.0
V/nS
a, m
V IL(DC) and V IL(DC) , V IH(DC)
10.2 Table 2: Input Setup & Hold Time Derating for Slew Rate
INPUT SLEW RATE
0.5 V/nS
0.4 V/nS
0.3 V/nS
Δ t IS
0
+50
+100
Δ t IH
0
0
0
UNIT
pS
pS
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
Δ t DS
0
+75
+150
Δ t DH
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
Δ t DS
0
+50
+100
Δ t DH
0
0
0
UNIT
pS
pS
pS
NOTES
j
j
j
10.5 Table 5: Output Sle w Rate Characteristics (X16 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)
0.7
0.7
MAXIMUM
(V/NS)
5.0
5.0
NOTES
a, c, d, f, g, h
b, c, d, f, g, h
Publication Release Date:Dec. 03, 2008
- 31 -
Revision A08
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