NI 9401 Operating Instructions and Specifications 14 ni.com
Maximum input signal switching frequency by number of input
channels, per channel
8 input channels..........................9 MHz
4 input channels..........................16 MHz
2 input channels..........................30 MHz
Maximum output signal switching frequency by number of output
channels with an output load of 1 mA, 50 pF, per channel
8 output channels........................5 MHz
4 output channels........................10 MHz
2 output channels........................20 MHz
I/O propagation delay....................... 100 ns max
I/O pulse width distortion................. 10 ns typ
Input current (0 V ≤ Vin ≤ 4.5 V)......±250 μA typ
Input capacitance.............................. 30 pF typ
Input rise/fall time.............................500 ns max
Overvoltage protection,
channel-to-COM............................... ±30 V max on one channel at
a time; however, continued
use at this level will degrade
the life of the module.