National Instruments PC-DIO-96 用户手册

Pins 1 through 48 and pins 51 through 98 of the I/O connector are digital I/O signal pins.  The
following specifications and ratings apply to the digital I/O lines.

Absolute maximum voltage rating

-0.5 to +5.5 V with respect to GND

Digital input specifications (referenced to GND):

Input logic high voltage

2.2 V minimum

5.3 V maximum

Input logic low voltage

-0.3 V minimum

0.8 V maximum

Maximum input current (0 < Vin < 5 V)

-1.0 

µ

A minimum

1.0 

µ

A maximum

Digital output specifications (referenced to GND):

Output logic high voltage

3.7 V minimum

5.0 V maximum

at Iout = -2.5 mA

Output logic low voltage

0.0 V minimum

0.4 V maximum

at Iout = 2.5 mA

Output current

4.0 mA minimum

—

at V

OL

 = 0.5 V

Output current

4.0 mA minimum

—

at V

OH

 = 2.7 V

Figure 2-7 depicts signal connections for three typical digital I/O applications.