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 k
Ω
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
µ
A
Input high current
—
10
µ
A
Output low voltage
(I
OL
= 24 mA)
—
0.4 V
Output high voltage
(I
OH
= 13 mA)
4.35 V
—
