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# 23310

Spartan-6/-3/-3E/-IIE/-II - Is there hysteresis on the clocks/data inputs? What is the value?


Is there hysteresis on Spartan-II, Spartan-2E, Spartan-3, Spartan-3E and Spartan-6 device inputs?

Hysteresis refers to the required change in the input voltage level that is needed to produce a change in the logic.


For Spartan-3/-3E/-6 FPGA, LVCMOS25, LVCMOS33 and LVTTL inputs have ~100 mV of hysteresis. LVCMOS12/15/18 inputs have ~10 mV of hysteresis.

For Spartan-II/-IIE FPGA, LVCMOS and LVTTL inputs have ~50 mV of hysteresis.

HSTL/SSTL and differential inputs use comparators with zero hysteresis.
AR# 23310
Date 02/21/2013
Status Active
Type General Article
  • Spartan-3
  • Spartan-3 XA
  • Spartan-3A
  • More
  • Spartan-3A DSP
  • Spartan-3AN
  • Spartan-3E
  • Spartan-6 LX
  • Spartan-6 LXT
  • Spartan-6Q
  • Spartan-II
  • Spartan-IIE
  • Less
Page Bookmarked