From: John@quantatw.com [mailto:John@quantatw.com]
Sent: Tuesday, October 12, 1999 1:35 AM
Subject: [SI-LIST] : The overshoot and undershoot criteria in PCI spec.
Dear all SI Experts,
What are the overshoot and undershoot criteria for PCI 5V and 3.3V
Based on PCI spec. rev. 2.2, 188.8.131.52 Section, Maximum AC Ratings and Device
for 3.3V PCI, the criteria seems to be 7.1V for overshoot and -3.5V for
For 5V PCI, 11V is for overshoot and -5.5V is for undershoot.
I wonder that such big overshoot and undershoot voltages will affect the
reliability of chips even the voltages are within the spec.
Your comments are appreciated.
Quanta Computer Inc.
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