External Pullup on CPLD

soumen21 · Feb 1, 2013

Hi, I have a cpld XC9536XL (3.3V operated). One pin is configured as output. Before loading the code configuring the pin as output, a 1K pull up resistor is used and the resistor is tied to 5V. Will it damage the CPLD due to backdriving i.e. from 5V to 3.3V ?

Inti Innovations · Feb 1, 2013

soumen21 said:
Hi, I have a cpld XC9536XL (3.3V operated). One pin is configured as output. Before loading the code configuring the pin as output, a 1K pull up resistor is used and the resistor is tied to 5V. Will it damage the CPLD due to backdriving i.e. from 5V to 3.3V ?

The I/O pins of this chip are 5V tolerant so it should be fine.

soumen21 · Feb 20, 2013

Can I configure this pin as 'inout' and can have a pullup resistor to 5V ?

Inti Innovations · Feb 22, 2013

That should work. Make sure that a pullup resistor is at least 10k.

External Pullup on CPLD

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External Pullup on CPLD

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