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# 16851

CPLD CoolRunner-II - What is the resistance of the bus-hold/keeper or pull-up circuitry?


What is the resistance of the bus-hold/keeper or pull-up termination circuitry for the CoolRunner-II ?


The effective resistance of the termination circuitry varies with VCCIO and temperature.

At VCCIO = 1.8V, the effective resistance is typically 100kOhm.

As VCCIO increases, the effective resistance decreases. Typical for VCCIO = 3.3V is 42kOhm.

The minimum resistance value presented by the termination circuitry is 20kOhm.

The resistance is less with colder temperatures. For example, with VCCIO = 1.8V and temperature = -40C, the effective resistance is 50kOhm, and with a temperature of 125C the resistance is 111kOhm.

For information on enabling or disabling the termination circuitry, see (Xilinx Answer 14318).

AR# 16851
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article