Answers Database

XC4000: capacitance of XC4000 inputs


Record #228

Problem Title:
XC4000: capacitance of XC4000 inputs


Problem Description:
Urgency: Standard

Keywords: XC4000, Capacitance, Pins

Description

The capacitive loading of XC4000 pins ranges from 10pf to 15pf.
The pins near the center of the device are around 10pf.  The
pins on the corners are around 15pf.Thus, the spec reads 15pf.
5pf is due to the IOB and the other 5pf-10pf is from the package and arrangement
.  The PLCC is actually one of the better packages (less pf loading)  The PGA is
 one of the worst (more pf loading.)



Solution 1:





End of Record #228