
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 @ |
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, |
Input mode (high impedance) |
Power consumption
Table 2. Power consumption specifications
+5V operating
37 mA typical, 55 mA max
Miscellaneous
Table 3. Miscellaneous specifications
+5 Volts DC | Available at I/O connector (+5V Power) | ||
| Protected by resettable fuse: |
| |
| | Hold current: | 350 mA |
| | Trip current: | 700 mA |
| | Trip and recovery time: | 100 mS |
Environmental
| Table 4. Environmental specifications |
|
|
Operating temperature range | 0 to 70 °C |
Storage temperature range | |
Humidity | 0 to 95% |
17