User`s guide

15
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Digital input / output
Table 1. Digital I/O specifications
Digital type
82C55 Emulation
Configuration
2 banks of 8, 2 banks of 4, programmable by bank as input or output
Output
Ports A and B: 74HC245A Port C: 74HC126
Input
Ports A and B: 74HC245A Port C: 74HC125
Number of channels
24 I/O
Switch State
Board Silk Screen Reference: S1 - Default +5V
3.3 V
Output high
2.8 volts min @ -2.5 mA
Output low
0.3 volts max @ 2.5 mA
Input high
2.6 volts min, 3.6 volts absolute max
Input low
1.3 volts max, -0.5 volts absolute min
5 V
Output high
4.5 volts min @ -2.5 mA
Output low
0.3 volts max @ 2.5 mA
Input high
2.6 volts min, 5.5 volts absolute max
Input low
1.3 volts max, -0.5 volts absolute min
Power-up / reset state
Input mode (10 k impedance from pull-up or pull-down)
Pull-up/pull-down resistors
EEPROM stored - Software Programmable driven by 74ACT244 through 10 k bussed
resistor networks (shipped in the pull-up state)
Interrupt enable
External (IRQ ENABLE, active low, disabled by default through internal resistor to TTL
high) and programmable through PCI9030; 0 = disabled, 1 = enabled (default)
Interrupt sources
External source (IRQ INPUT), polarity programmable through PCI9030;
1 = active high, 0 = active low (default)
Power Consumption
Table 2. Power consumption specifications
+3.3 V operating
515 mA typical
+3.3 V with 5 V I/O
520 mA typical
+V
DIO
User Output
125 mA max. @ +5V; 375 mA max. @ +3.3 V
Fuses: +V
DIO
User Output
+12 V
0452.375 - Littelfuse 0.375A NANO
2®
Slo-Blo
®
Subminiature Surface Mount Fuse
Environmental
Table 3. Environmental specifications
Operating temperature range
0 to 50 °C
Storage temperature range
-20 to 70 °C
Humidity
0 to 90% non-condensing
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