Measurement Computing PCI-DIO24/LP - Manual (Page 14)

14
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
Number of I/O 24 (Port A0 through Port C7)
Configuration 2 banks of 8 and 2 banks of 4 or
3 banks of 8 or
2 banks of 8 with handshake
Input low voltage 0.8 V max
Input high voltage 2.2 V min
Output low voltage (IOL = 2.5 mA) 0.5 V max
Output high voltage (IOH = -2.5 mA) 2.4 V min
Absolute maximum input voltage -0.5 V, +7 V
Power-up/reset state Input mode (high impedance)
Pull-up/pull-down resistors Dual footprint allows pull-up or pull-down configuration.
Interrupts
Table 2. Interrupt specifications
Interrupts INTA# - mapped to IRQn via PCI BIOS at boot-time
Interrupt enable External (IRQ_ENABLE) active low, disabled by default through internal
resistor to TTL high and programmable through PLX9030
Interrupt sources
 External source (IRQ_INPUT)
 Polarity programmable through PLX9030
 Edge or level triggered programmable through PLX9030
 Assertion Time: 40 ns min
Power consumption
Table 3. Power consumption specifications
+5 V operating 240 mA typical, 350 mA max. Does not include power consumed through the
I/O connector.
+5 V available at I/O connector 300 mA max, protected with a resettable fuse
Resettable fuse Raychem type miniSMDC110.
Hold current: 1.1 A max
Series resistance: 0.21 Ohms max.
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