Chapter 4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Digital input/output
Table 1. Digital I/O specifications
Digital type 82C55
Configuration 4 banks of 8, 4 banks of 4, programmable by bank as input or output
Number of channels 48 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)
Power consumption
Table 2. Power consumption specifications
+5V operating 37 mA typical, 55 mA max
Miscellaneous
Table 3. Miscellaneous specifications
Available at I/O connector (+5V Power)
+5 Volts DC
Protected by resettable fuse:
Hold current: 350 mA
Trip current: 700 mA
Trip and recovery time: 100 m
Environmental
Table 4. Environmental specifications
Operating temperature range 0 to 70 °C
Storage temperature range -40 to 100 °C
Humidity 0 to 95% non-condensing
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