TTL Digital Input/Output Module Operating Instructions And Specifications

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 ≤ V
in
≤ 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.