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AR# 13428

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


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


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
  • 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