© National Instruments Corporation A-1 NI 781xR User Manual
A

Specifications

This appendix lists the specifications of the NI781xR. These specifications
are typical at 25 °C unless otherwise noted.

Digital I/O

Number of channels............................... 160 input/output
Compatibility......................................... TTL
Digital logic levels
Maximum output current
Imax (sink)........................................5.0 mA
Imax (source).................................... 5.0 mA
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
can be shorted at a time)
Level Min Max
Input low voltage (VIL)
Input high voltage (VIH)
0.0 V
2.0 V
0.8 V
5.5 V
Output low voltage (VOL),
where IOUT = –Imax (sink)
Output high voltage (VOH),
where IOUT = Imax (source)
—
2.4 V
0.4 V
—