Measurement-computing USB-231 Manuel d'utilisateur télécharger pdf (Page 24)

USB-231 User's Guide Specifications

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 or falling

Counter direction Count up

Counter source CTR

Input frequency 5 MHz max

High pulse width 100 ns min

Low pulse width 100 ns min

1 2 ... 19 20 21 22 23 24 25 26 27 28 29

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Measurement-computing USB-231 Manuel d'utilisateur Page 24

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