PCI-DAS1002 User's ManualSpecifications

Counters

Table 9. Counter specifications

Parameter

 

Specification

 

 

 

 

 

 

Counter type

 

82C54

 

Configuration

Two 82C54 devices. 3 down counters per 82C54, 16 bits each

82C54A:

 

Counter 0 - ADC residual

Source:

ADC Clock

 

 

sample counter

Gate:

Internal programmable source

 

 

 

Output:

End-of-Acquisition interrupt

 

 

Counter 1 - ADC pacer lower

Source:

10 MHz oscillator

 

 

divider

Gate:

Tied to counter 2 gate, programmable source

 

 

 

Output:

Chained to counter 2 clock

 

 

Counter 2 - ADC pacer upper

Source:

Counter 1 output

 

 

divider

Gate:

Tied to counter 1 gate, programmable source

 

 

 

Output:

ADC pacer clock (if software selected). Available at

 

 

 

 

user connector.

82C54B:

 

Counter 0 - pretrigger mode

Source:

ADC clock

 

 

 

Gate:

External trigger

 

 

 

Output:

End-of-Acquisition interrupt

 

 

Counter 0 - user counter 4

Source:

User input at 100-pin connector (CTR4 CLK)

 

 

(when in non-pretrigger mode)

 

or internal 10 MHz (software selectable)

 

 

 

Gate:

User input at 100-pin connector (CTR4 GATE)

 

 

 

Output:

Available at 100-pin connector (CTR4 OUT)

 

 

Counter 1 - user counter 5

Source:

User input at 100-pin connector (CTR5 CLK)

 

 

 

Gate:

User input at 100-pin connector (CTR5 GATE)

 

 

 

Output:

Available at 100-pin connector (CTR5 OUT)

 

 

Counter 2 - user counter 6

Source:

User input at 100-pin connector (CTR6 CLK)

 

 

 

Gate:

User input at 100-pin connector (CTR6 GATE)

 

 

 

Output:

Available at 100-pin connector (CTR6 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

0.8 V max

 

Input high voltage

2.0 V min

 

Output low voltage

0.4 V max

 

Output high voltage

3.0 V min

 

Crystal oscillator frequency

10 MHz

 

Frequency accuracy

50 ppm

 

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Measurement Specialties PCI-DAS1002 manual Counters, Counter specifications