UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 13428

Virtex-6/-5/-4/-II Pro/-II - Will driving the I/Os of an unpowered bank cause damage to the part?

Description

Will driving the I/Os of an unpowered bank cause damage to the part? How much current can the clamp diodes sink?

Solution

Driving Virtex-II/-II Pro and Virtex-4/-5/-6 FPGA I/Os while VCCO is not present does not cause any damage. The outside High driver pulls the pin High, and VCCO is pulled to a level one diode drop below the driving voltage. It is important to keep I/Os from reverse powering the VCCO to levels outside the FPGA's valid voltage range (see data sheet).

However, if VCCO is grounded or there is a strong path to GND, the per-pin current must remain below 10 mA to prevent damage to the device. In this case, numerous pins sinking >100 mA for long periods of time could lead to device failure.

The Iin parameter was added to the Virtex-4 FPGA and newer data sheets.

For more information on hot-swapping issues, please see (Xilinx XAPP251): "Hot-Swapping Virtex-II Devices".

For relatedinformation regarding7 series FPGAs, pleasesee (Xilinx Answer 37347).

Linked Answer Records

Associated Answer Records

AR# 13428
Date Created 08/29/2007
Last Updated 12/15/2012
Status Active
Type General Article
Devices
  • Virtex-4 FX
  • Virtex-4 LX
  • Virtex-4 QPro/R
  • More
  • Virtex-4 SX
  • Virtex-4Q
  • Virtex-4QV
  • Virtex-5 FXT
  • Virtex-5 LX
  • Virtex-5 LXT
  • Virtex-5 SXT
  • Virtex-5 TXT
  • Virtex-5Q
  • Virtex-5QV
  • Virtex-6 CXT
  • Virtex-6 HXT
  • Virtex-6 LX
  • Virtex-6 LXT
  • Virtex-6 SXT
  • Virtex-6Q
  • Virtex-II
  • Virtex-II Pro
  • Virtex-II Pro X
  • Virtex-II QPro/R
  • Less