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Specifications, Digital input / output, Counters – Measurement Computing CIO-DIO24/CTR3 User Manual

Page 18: Chapter 5

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Chapter 5

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Digital Input / Output

Table 1. Digital input/output specifications

Digital type

82C55

Configuration

2 banks of 8, 2 banks of 4, programmable by bank as input or output

Number of channels

24 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)

Interrupts

2 through 7, jumper selectable

Interrupt enable

External (IR Enable), logic low enabled (disabled by default via internal

10k resistor to +5V)

Interrupt sources

External (IR Input), rising edge

Miscellaneous

Locations provided for installation of pull-up or pull-down resistors.

Counters

Table 2. Power consumption specifications

Counter type

82C54

Configuration

3 down counters, 16-bits each

Counter 0 - independent, user configurable

Source:

User connector (CLK0) and optionally, 10MHz

on-board xtal oscillator, selectable by jumper

Gate:

User connector (GATE0)

Output:

User connector (OUT0) and optionally, counter 1 clock

input, selectable by jumper

Counter 1 - independent, user configurable

Source:

User connector (CLK1) and optionally, counter 0

output, selectable by jumper

Gate:

User connector (GATE1)

Output:

User connector (OUT1) and optionally, counter 2 clock

input, selectable by jumper

Counter 2 - independent, user configurable

Source:

User connector (CLK2) and optionally, counter 1

output, selectable by jumper

Gate:

User connector (GATE2)

Output:

User connector (OUT2)

Clock input frequency

10 MHz max

High pulse width (clock input)

30 ns min

Low pulse width (clock input)

50 ns min

Gate width high

50 ns min

Gate width low

50 ns min

Input low voltage

0.8 V max

Input high voltage

2.0 V min

Output low voltage

0.4 V max

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