TTL Digital Input/Output Module Operating Instructions And Specifications

© National Instruments Corp. 13 NI 9401 Operating Instructions and Specifications
Digital logic levels
Input
Voltage ................................. 5.25 V max
High, V
IH
.............................. 2 V min
Low, V
IL
............................... 0.8 V max
Output
High, V
OH
............................. 5.25 V max
Sourcing 100 μA ........... 4.7 V min
Sourcing 2 mA............... 4.3 V min
Low, V
OL
Sinking 100 μA ............. 0.1 V max
Sinking 2 mA................. 0.4 V max