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Configuration and Installation
Digital I/O Signal Connections
Pins 1 through 48 and pins 51 through 98 of the I/O connector are digital I/O signal pins. The
following specifications and ratings apply to the digital I/O lines.
Absolute maximum voltage rating
Digital input specifications (referenced to GND):
Input logic high voltage
Input logic low voltage
Maximum input current (0 < V in < 5 V)
Digital output specifications (referenced to GND):
Output logic high voltage
at I out = -2.5 mA
Output logic low voltage
at I out = 2.5 mA
Output current
at V
= 0.5 V
OL
Output current
at V
= 2.7 V
OH
Figure 2-7 depicts signal connections for three typical digital I/O applications.
PC-DIO-96 User Manual
-0.5 to +5.5 V with respect to GND
2.2 V minimum
-0.3 V minimum
-1.0 A minimum
3.7 V minimum
0.0 V minimum
4.0 mA minimum
4.0 mA minimum
2-12
5.3 V maximum
0.8 V maximum
1.0 A maximum
5.0 V maximum
0.4 V maximum
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© National Instruments Corporation
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