Question: What are the source and sink resistances of PSoC 1 GPIO configured in strong drive mode?
The source and sink resistances of a GPIO configured in strong drive mode are 100 Ω and 30 Ω respectively. The VOH and VOL specifications by accounting these source/sink resistances are given below.
VOH = Vdd-1 V at 10 mA: 100 Ω sourcing
VOL = 0.75 V at 25 mA: 30 Ω sinking