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Appendix A Specifications
© National Instruments Corporation A-5 NI 7831R User Manual
Digital logic levels
Maximum output current
I
max
(source)..................................... 5.0 mA
I
max
(sink)........................................ 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
may be shorted at a time)
Reconfigurable FPGA
Number of logic slices ...........................5,120
Equivalent number of logic cells ....11,520
Available embedded RAM.....................81,920 bytes
Timebase................................................40, 80, 120, 160, or 200 MHz
Timebase reference sources
NI PCI-7831R.................................Onboard clock only
NI PXI-7831R.................................Onboard clock, phase-locked to
PXI 10 MHz clock
Timebase accuracy
Onboard clock.................................±100 ppm, 250 ps jitter
Level Min Max
Input low voltage (V
IL
)
Input high voltage (V
IH
)
0.0 V
2.0 V
0.8 V
5.5 V
Output low voltage (V
OL
),
where I
OUT
= –I
max
(sink)
Output high voltage (V
OH
),
where I
OUT
= I
max
(source)
—
2.4 V
0.4 V
—