National Instruments E Series Digital I/O , Timing I/O

Appendix A Specifications for DAQCard-AI-16XE-50
 National Instruments Corporation A-11 DAQCard E Series User Manual
Digital I/O Number of channels .......................... 8 input/output
Compatibility.................................... TTL/CMOS
Power-on state................................... Input (High-Z) pulled up via
100 kΩ
Data transfers.................................... Programmed I/O
Timing I/O Number of channels.......................... 2 up/down counter/timers,
1 frequency scaler
Resolution
Counter/timers............................ 24 bits
Frequency scaler......................... 4 bits
Compatibility.................................... TTL/CMOS
Base clocks available
Counter/timers............................ 20 MHz, 100 kHz
Frequency scaler......................... 10 MHz, 100 kHz
Base clock accuracy.......................... ±0.01%
Max source frequency....................... 20 MHz
Min source pulse duration ................ 10 ns, edge-detection mode
Min gate pulse duration .................... 10 ns, edge-detection mode
Data transfers.................................... DMA, interrupts,
programmed I/O
Digital logic levels .......... Level Min Max
Input low voltage 0 V 0.8 V
Input high voltage 2 V 5 V
Input low current — -320 µA
Input high current — 10 µA
Output low voltage
(IOL = 24 mA) — 0.4 V
Output high voltage
(IOH = 13 mA) 4.35 V —