Appendix A Specifications - National Instruments NI 781xR User Manual

Specifications
Digital I/O
© National Instruments Corporation
This appendix lists the specifications of the NI 781xR. These specifications
are typical at 25 °C unless otherwise noted.
Number of channels ............................... 160 input/output
Compatibility ......................................... TTL
Digital logic levels
Level
Input low voltage (V
Input high voltage (V
Output low voltage (V
where I = –I (sink)
OUT max
Output high voltage (V
where I = I (source)
OUT max
Maximum output current
I (sink) ........................................ 5.0 mA
max
I (source) .................................... 5.0 mA
max
Input leakage current.............................. ±10 µA
Power-on state........................................ Programmable by line
Data transfers ......................................... Interrupts, programmed I/O
Protection
Input ................................................ –0.5 to 7.0 V
Output ............................................. Short-circuit (up to eight lines
)
IL
)
IH
),
OL
),
OH
can be shorted at a time)
A-1
A
Min Max
0.0 V 0.8 V
2.0 V 5.5 V
— 0.4 V
2.4 V —
NI 781xR User Manual