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AR# 44225

7 Series Power Sequencing - Hot-swap/-plug capability

Description

Are the 7 series devices capable ofhot-swap?

Solution

7 series High Range (HR) Select I/O banks have a VCCO power sequencing requirement. This requirement applies to Artix-7, Kintex-7, Virtex-7, and Zynq-7000 (both PS and SelectIO) devices. All devices have at least one High Range bank; the Configuration Bank 0 for all silicon revisions (ESLAB, Initial ES, General ES, Production).

According to the specification, "for VCCO voltages of 3.3V in HR I/O banks and configuration bank 0, the voltage difference between VCCO and VCCAUX must not exceed 2.625V for longer than TVCCO2VCCAUX for each power-on/off cycle to maintain device reliability levels."

If in a hot-swap situation, an unpowered device is subject to a Vin greater than 2.625V (assuming Vccaux is unpowered i.e.,0V), then the specification quoted above is violated.

It is also important to note that clamp diodes are always present on the I/O. So, when driving a potentially unpowered bank, there will be current forward biasing the clamp diodes. The Iin specification from the data sheet needs to be observed to ensure current on both an I/O and Bank basis are within specification.

The behavior of the I/O is not guaranteed until the device is powered up.

Linked Answer Records

Associated Answer Records

AR# 44225
Date Created 06/28/2012
Last Updated 03/03/2013
Status Active
Type General Article
Devices
  • Virtex-7
  • Kintex-7
  • Artix-7
  • More
  • Virtex-7 HT
  • Zynq-7000
  • Less