W9425G8EH Datasheet, PDF (32/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
10.8 Table 8: Overshoot/Undershoot Specification for Data, Strobe, and Mask Pins
PARAMETER
Maximum peak amplitude allowed for overshoot
DDR400
1.2 V
SPECIFICATION
DDR333
1.2 V
DDR266
1.2 V
Maximum peak amplitude allowed for undershoot
1.2 V
1.2 V
1.2 V
The area between the overshoot signal and VDD
must be less than or equal to Max. area in Figure 4
1.44 V-nS
2.25 V-nS
2.4 V-nS
The area between the undershoot signal and GND
must be less than or equal to Max. area in Figure 4
1.44 V-nS
2.25 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 4: DQ/DM/DQS AC Overshoot and Undershoot Definition
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Publication Release Date: Jul. 04, 2008
Revision A01