Answers Database

XC9500: Pull-ups in IOB should pull up to VccIO, not VccINT as Data Book shows


Record #1282

Product Family:  Hardware

Product Line:  9500

Problem Title:
XC9500:	Pull-ups in IOB should pull up to VccIO, not VccINT as Data
Book shows



Problem Description:
Keywords: VccIO, VccINT, IOB, pull-up

Urgency: standard

General Description:

All the Data Books (1996 and after) show the pull-ups in the IOB of a 9500
device pulling upto VccINT.


Solution 1:

This is incorrect.  It actually pulls up to VccIO.

This assures that during programming and power-up, when this pull-up is active,

the pin will only be at VccIO, and will not damage any 3.3V parts which it is
interfacing to.



End of Record #1282