Hi all,
I need to trigger some hardware with 3.3V TTL / 3.3V LVCMOS input using the NI 9401 module which is 5V TTL. Since there's no room for an extra power supply I'd rather use passive components to realise the transition from 5V to 3.3V instead of a voltage level shifter. I was thinking about using a 3.3V zener diode in series with a resistor to create a simple voltage regulator as shown in the image. On the datasheet of the 9401 module I couldn't find the maximum output current so I was wondering if the 9401 module can produce 20mA which is the testcurrent (Iz,t) mentioned in the diode datasheet. Anyone who has done something simular? I could also build a voltage devider with less current in the network but ofcourse that's less stable. The output is to be used as a positive edge trigger.
Thanks in advance
Cedric
