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Chapter 3

Signal Connections

PCI-DIO-96 User Manual

3-6

 National Instruments Corporation

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):

•

Digital output specifications (referenced to GND):

Mode 1
(Strobed 
Output)

Handshaking

OBFA*

ACKA*

I/O

I/O

INTRA

ACKB*

OBFB*

INTRB

Mode 2 
(Bidirectional 
Bus)

Handshaking

OBFA*

ACKA*

IBFA

STBA*

INTRA

I/O

I/O

I/O

*Indicates that the signal is active low.

 Subscripts A and B denote port A or port B handshaking signals.

–

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 

µ

A minimum

1 

µ

A maximum

–

Output logic high 
voltage at 

3.7 V minimum
Iout = -2.5 mA

—

–

Output logic low 
voltage

—

0.4 V maximum at 
Iout = 2.5 mA

Table 3-2.  Port C Signal Assignments  (Continued)