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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

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) 0.4 V max

Power up / reset state Input mode

Counter

Table 2. Counter specifications

Counter type Event counter

Number of channels 1

Input source CTR screw terminal

Input type TTL, rising edge triggered

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

Power

Table 3. Power specifications

Parameter Conditions Specification

Supply current (Note 1) 20 mA typ, 40 mA max

Connected to Self-Powered Hub 4.5 V min, 5.25 V max +5V USB power available (Note 2)

Connected to Bus-Powered Hub 4.1 V min, 5.25 V max

Connected to Self-Powered Hub 460 mA max Output Current (Note 3)

Connected to Bus-Powered Hub 60 mA max

Note 1: This is the total current requirement for the USB-1024LS which includes up to 5mA for the

status LED.

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