Measurement-computing CIO-DAS08-AOH Manual de usuario descargar pdf (Pagina 25)

Counter section

Counter type 82C54

Configuration 3 down counters, 16 bits each

Counter 0 - independent, user configurable

Source: user connector (Counter 0 In)

Gate: tied high through 10k (enabled)

Output: user connector (Counter 0 Out)

Counter 1 - independent, user configurable

Source: user connector (Counter 1 In)

Gate: user connector (Gate 1)

Output: user connector (Counter 1 Out)

Counter 2 - independent, user configurable

Source: 1MHz (from 10MHz Xtal via divide-by-ten) or PC SysClk (via divide by 2 circuit)

selectable by jumper

Gate: user connector (Gate 2)

Output: user connector (Counter 2 Out)

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 0.8V max

Input high voltage 2.0V min

Output low voltage 0.4V max

Output high voltage 3.0V min

Environmental

Operating temperature range 0 to 50°C

Storage temperature range −20 to 70°C

Humidity 0 to 95% non-condensing

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Measurement-computing CIO-DAS08-AOH Manual de usuario Pagina 25