AR# 54004


Zynq-7000 SoC ZC702 Evaluation Kit - PMOD Header rise / fall time


When using the PMOD headers on the Zynq-7000 SoC ZC702 Evaluation kit, while the voltage level output might appear normal at steady state, the rise / fall times on the other side of the level shifter might not be as expected.


The maximum voltage output of the level shifter is 1.5V and the rise time can be several microseconds. The NDS331N FET used has a gate capacitance ~200 pF in this application.

The 200 pF load will affect maximum toggle rate, which would be ~100 kHz.

There are no speed requirements for PMOD or GPIOs. The recommendation for users looking for a specific high speed access with GPIO is to use the FMC interface instead.

AR# 54004
Date 05/28/2018
Status Active
Type General Article
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