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Appendix A
Specifications
Digital I/O
NI 951x User Manual
Position capture input
Digital logic levels
Voltage .....................................–0.25 to 5.25 V
High, V
..................................2.0 V min
IH
Low, V
...................................0.8 V max
IL
Input current
(0 V ≤ V
≤ 4.5 V) ........................±2 mA max
in
2
Min pulse width
Max capture latency ........................200 ns
Capture accuracy .............................±1 count
Active edge......................................Programmable: rising edge or
Position compare outputs
High, V
........................................5.25 V max
OH
Sourcing 12 mA .......................3.7 V min
Sourcing 4 mA .........................3.9 V min
Low, V
OL
Sinking 12 mA .........................0.7 V max
Sinking 4 mA ...........................0.5 V max
Compare mode.................................Programmable: single or periodic
Compare action................................Programmable: set, toggle, or
Max compare rate (periodic) ...........5 MHz
Pulse width (programmable)
Min ...........................................100 ns
Max...........................................1.6 ms
Active state...............................Programmable: high or low
Inputs
Number of inputs
NI 9512.....................................4
NI 9514 and NI 9516................2
Input type.........................................Programmable: sinking or
.............................100 ns
falling edge
pulse
sourcing
A-4
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