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AR# 38820

What does the drive strength of an I/O mean?

Description

What does the drive strength of an I/O really mean?

Solution

The drive strength of an I/O specifies how much current we can drive and sink while maintaining the minimum Voh and Vol levels.

For example:

A LVCMOS25_8mA driver can drive and sink a current of 8 mA and still produce output levels (taken from Spartan-6 data sheet)

Voh = Vcco - 0.4V

Vol = 0.45V

This means we can drive a 262 Ohm resistor to GND (2.1V/8mA = 262.5) and still get the guaranteed output level.
AR# 38820
Date Created 10/29/2010
Last Updated 09/03/2013
Status Active
Type General Article
Devices
  • Virtex-II QPro/R
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