MCC USB-230 Series: USB-234 16-bit, 100 kS/s Multifunction DAQ Device - User Guide

USB-234 User's Guide Specifications
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Digital input
Table 5. Digital input specifications
Parameter Condition Specification
Input voltage range
Power on
0 V to 5 V
Power off
0 V to 3.3 V (Note 1)
Input voltage protection
±20 V on two lines per port (maximum of five
lines for all ports) for up to 24 hours
Input high voltage 2.3 V min
Input low voltage
0.8 V max
Input leakage current
At 3.3 V
0.8 mA max
At 5 V
4.5 mA max
Note 1: Do not leave a voltage above 3.3 V connected on the DIO line when the device is not powered. This can cause
long-term reliability issues.
Digital output
Table 6. Digital output specifications
Parameter Condition Specification
Output low voltage
4 mA
0.7 V max
1 mA
0.2 V max
Output high voltage
4 mA
2.1 V min
1 mA
2.8 V min
3.6 V max
Maximum output current per
line
±4 mA
External digital trigger
Table 6. External digital trigger specifications
Parameter Specification
Trigger source
TRIG input
Trigger mode
Software configurable for rising or falling edge. Power on default is rising edge.
Input high voltage
2.3 V min
Input low voltage
0.8 V max
Counter
Table 7. Counter specifications
Parameter Specification
Pin name
CTR
Number of counters
1
Resolution
32 bits
Counter type
Edge counter (rising)
Counter direction
Count up
Counter source
CTR
Input frequency
5 MHz max
High pulse width
100 ns min
Low pulse width
100 ns min