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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 µA