Answers Database
Virtex: Can Virtex Inputs be driven by input voltages lower that -500mV?
Record #8383
Problem Title:
Virtex: Can Virtex Inputs be driven by input voltages lower that -500mV?
Problem Description:
Urgency: Standard
Problem Description:
Can Virtex Inputs be driven by voltages under the minimum spec of -500mV?
For example, If one drives them with -750mV, what would happen to the device.
Solution 1:
The Virtex IO buffers have a clamp diode to GND that will turn on at ~-500mV.
Exceeding -500mV will cause excess current to to be sunk to ground.
The reliability of the buffer will not be affected by a short spurt of the undershoot
transient. However, If the buffer is held at below -500mV, such as -750mV, for a
extended periods of time, reliabilty could become a concern.
End of Record #8383 - Last Modified: 01/07/00 11:21 |
