Measurement Computing CIO-DIO24 - Manual (Page 17)

Chapter 5
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Digital Input / Output
Table 1. Digital input/output specifications
Digital type 82C55
Configuration 2 banks of 8, 2 banks of 4, programmable by bank as input or output
Number of channels 24 I/O
Output high 3.0 volts min @ -2.5 mA
Output low 0.4 volts max @ 2.5 mA
Input high 2.0 volts min, 5.5 volts absolute max
Input low 0.8 volts max, -0.5 volts absolute min
Power-up / reset state Input mode (high impedance)
Interrupts 2 through 7, jumper selectable
Interrupt enable External (IR Enable), logic low enabled (disabled by default via internal
10k resistor to +5V)
Interrupt sources External (IR Input), rising edge
Miscellaneous Locations provided for installation of pull-up or pull-down resistors.
Power consumption
Table 2. Power consumption specifications
Parameter Specification
+5V
170 mA typical, 270 mA max
Environmental
Table 3. Environmental specifications
Operating temperature range 0 to 70 °C
Storage temperature range -40 to +100 °C
Humidity 0 to 90% non-condensing
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