AR# 16851

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

Description

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

Solution

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 12/15/2012
Status Active
Type General Article
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