W9425G6EH Datasheet, PDF (31/50 Pages) Winbond – 4 M × 4 BANKS × 16 BITS DDR SDRAM

W9425G6EH
9.9 Overshoot/Undershoot Specification for Data, Strobe, and Mask Pins
PARAMETER
Maximum peak amplitude allowed for overshoot
Maximum peak amplitude allowed for undershoot
The area between the overshoot signal and VDD
must be less than or equal to Max. area in Figure 2
The area between the undershoot signal and GND
must be less than or equal to Max. area in Figure 2
DDR500
1.2 V
1.2 V
SPECIFICATION
DDR400 DDR333
1.2 V
1.2 V
1.2 V
1.2 V
1.44 V-nS 1.44 V-nS 2.25 V-nS
1.44 V-nS 1.44 V-nS 2.25 V-nS
DDR266
1.2 V
1.2 V
2.4 V-nS
2.4 V-nS
VDD
Overshoot
5
4
Max. amplitude = 1.2V
3
2
Max. area
1
0
-1
-2
Max. amplitude = 1.2V
-3
GND
-4
-5
0 0.5 1.0 1.42 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 5.68 6.0 6.5 7.0
Time (nS)
Undershoot
Figure 2: DQ/DM/DQS AC Overshoot and Undershoot Definition
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Publication Release Date:Apr. 11, 2008
Revision A04