The I-V curve of the UP5k LVCMOS driver (running at 3v3) were measured by @smunaut for both sink and source.

Measurement setup

The FPGA was connected to a Keithley 2400 SMU that was configured to either sink/source current and measure the resulting voltage.

• For sink measurement, the FPGA was actively driving the output low and the SMU was setup to source sweep from 0 to 44 mA.
• For source measurement, the FPGA was actively driving the output high and the SMU was setup to sink sweep from 0 to -50 mA.

Measurements were done on 4 different pins, twice each. All measurements were done on the same FPGA, but just checking the short circuit current on multiple FPGAs showed little variations, so data should be fairly typical.

Results

Graphs

RAW data

RAW CSV files are available for :

• Sink
• Source