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Electronics Explorer - Low Level of Static I/O when Vcc is 5V


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Question

I am trying to use older PAL devices with a Vcc requirement of 5 V on the EE .

 

When using a Switch or Push Button in the Static I/O Module, the output levels are:

 

HIGH: 3.3 V 

LOW: 1.6 V

 

The low level is obviously too high.

 

Is EE's Static I/O not intended for 5 V?

Edited by Josh
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  • Solution

The digital IO pins use LVCMOS3V3 standard. These are supplied at 3.3V and have protection: 200 Ohm thermistor and clamping diodes to GND and to 3.3V

The low level in your experiment is probably pulled up to 1.6V by the device you are testing. 

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