© National Instruments Corporation A-1 PC-DIO-24 User Manual
Appendix ASpecifications
This appendix lists the specifications for the PC-DIO-24 board. These specifications are typical at 25° C, unless
otherwise stated. The operating temperature range is 0° to 70° C.

Digital I/O

Number of channels .................................................... 24 I/O
Compatibility .............................................................. TTL
Absolute max voltage input rating.............................. -0.5 to +5.5 V with respect to GND
Handshaking................................................................ Requires 1 port
Power-on state............................................................. Configured as inputs
Data transfers .............................................................. Interrupts, programmed I/O

Digital Logic Levels

Input Signals

Odd-numbered pins 1–47......................................... Level Min Max
Input logic high voltage 2.2 V 5.3 V
Input logic low voltage -0.3 V 0.8 V
Input current
(0 < Vin < 5 V) -1.0 µA 1.0 µA

Output Signals

Pin 49 (at +5 V)........................................................... 0.25 A max
Odd-numbered pins 1–47......................................... Level Min Max
Output high voltage
(Iout = -2.5 mA) 3.7 V 5.0 V
Output low voltage
(Iout = 2.5 mA) 0.0 V 0.4 V
Output current
(VOL = 0.5 V) 4 mA —
Output current
(VOH = 2.7 V) 4 mA —

Environment

Operating Temperature............................................... 0° to 70° C
Storage Temperature................................................... -55° to 150° C
Relative humidity........................................................ 5% to 90% noncondensing