National Instruments 3.21E+04 用户手册
Appendix A Specifications for AT-MIO-16XE-50
AT-MIO/AI E Series User Manual
A-30
National Instruments Corporation
Digital I/O
Number of channels ...........................8 input/output
Compatibility .....................................TTL/CMOS
Power-on state ...................................Input (High-Z)
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-detect mode
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
voltage
(IOL = 24 mA)
—
0.4 V
Output high
voltage
voltage
(IOH = 13 mA)
4.35 V
—