Measurement Computing PCI-DIO24H - Manual (Page 14)

14
Chapter 4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Power consumption
Table 1. Power consumption specifications
+5V operating 625 mA typical, 960 mA max
Digital input / output
Table 2. Digital input / output specifications
Digital type 8255 mode 0 emulation
Output: 74S244
Input: 74LS373
Configuration 2 banks of 8, 2 banks of 4, programmable by bank as input or output
Number of channels 24 I/O
Output high 2.4 volts min @ -15 mA
Output low 0.5 volts max @ 64 mA
Input high 2.0 volts min, 7 volts absolute max
Input low 0.8 volts max, -0.5 volts absolute min
Power-up / reset state Input mode (high impedance)
Interrupts INTA# - mapped to IRQn via PCI BIOS at boot-time
Interrupt enable External (IR ENABLE, active low, disabled by default through internal resistor to
TTL high) and programmable through PCI9052:
0 = disabled
1 = enabled (default)
Interrupt sources External source (IR INPUT), polarity programmable through PCI9052;
1 = active high
0 = active low (default)
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