©
National Instruments Corporation
A-1
PC-DIO-24/PnP User Manual
Appendix
A
Specifications
This appendix lists the specifications for the PC-DIO-24/PnP 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
(Vcc = 5.0 V) ......................................–0.5 to +5.5 V with
respect to GND
Handshaking .......................................Requires one port
Power-on state ....................................Configured as inputs, pulled
high or low (jumper-selectable)
Data transfers ......................................Interrupts, programmed I/O
Digital Logic Levels
Input Signals
The maximum input logic high and output logic high voltages assume a
Vcc supply voltage of 5.0 V.
Level
Min
Max
Input logic high voltage
2.2 V
5.3 V
Input logic low voltage
–0.3 V
0.8 V
Input high current
(V
in
= 5 V, W1 set to pullup)
—
11.0
µ
A
