Measurement-computing USB-DIO24/37 Instrukcja Użytkownika Pobierz pdf (Strona 15)

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 A Bit 0 through Port C Bit7)

Configuration

2 banks of 8 and 2 banks of 4, or

3 banks of 8

Pull up/pull-down configuration

All pins pulled up to Vs via 47K resistors (default). Selection available for

pull down to ground. Hardware selectable via zero ohm resistor.

Input high voltage

2.0 V min, 5.5 V absolute max

Input low voltage

0.8 V max, –0.5 V absolute min

Output high voltage (IOH = -2.5 mA)

3.0 V min

Output low voltage (IOH = -2.5 mA)

0.4V max

Power up / reset state

Input mode

Counter

Table 2. Counter specifications

Pin name (Note 1)

CTR

Counter type

Event counter

Number of channels

Input type

TTL, rising edge triggered

Input source

CTR screw terminal

Resolution

32 bits

Schmidt trigger hysteresis

20 mV to 100 mV

Input leakage current

±1 µA

Maximum input frequency

1 MHz

High pulse width

500 ns min

Low pulse width

500 ns min

Input low voltage

0 V min, 1.0 V max

Input high voltage

4.0 V min, 15.0 V max

Note 1: CTR is a Schmitt trigger input

1 2 ... 10 11 12 13 14 15 16 17 18 19

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