Measurement Computing CIO-DAS16 - Manual (Page 34)

Counter section
Counter type 82C54
Configuration 82C54 device. 3 down-counters, 16 bits each
Counter 0 - Independent user counter
Source: Internal 100 kHz or external (CTR 0 Clock In), software selectable
Gate: External (Dig In 2 / CTR 0 Gate), software enabled
Output: Available at user connector (CTR 0 Out)
Counter 1 - ADC Pacer Lower Divider
Source: 1 or 10 MHz oscillator, jumper selectable
Gate: Tied to Counter 2 gate, programmable source: external (Dig In 0 /
Trigger) or internal
Output: Chained to Counter 2 Clock.
Counter 2 - ADC Pacer Upper Divider
Source: Counter 1 Output.
Gate: Tied to Counter 1 gate, programmable source (external or internal).
Output: ADC start convert, available at user connector (CTR 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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