Measurement Computing PCI-DAS1200 - Manual (Page 19)

PCI-DAS1200 User's Guide Specifications
18
Counter
Table 4. Counter specifications
Parameter Specification
Counter type 82C54
Configuration Two 82C54 devices. 3 down counters per 82C54, 16 bits each
82C54A:
Counter 0 - ADC residual sample
counter.
 Source: ADC Clock.
 Gate: Internal programmable source.
 Output: End-of-Acquisition interrupt.
Counter 1 - ADC pacer lower
divider
 Source: 10 MHz oscillator
 Gate: tied to counter 2 gate, programmable source.
 Output: chained to counter 2 clock.
Counter 2 - ADC pacer upper
divider
 Source: counter 1 output.
 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 (when
in non-pretrigger mode)
 Source: User input at 100-pin connector (CLK4) or internal 10 MHz (software
selectable)
 Gate: user input at 100-pin connector (GATE4)
 Output: available at 100-pin connector (OUT4)
Counter 1 - user counter 5  Source: user input at 100-pin connector (CLK5)
 Gate: user input at 100-pin connector (GATE5)
 Output: available at 100-pin connector (OUT5)
Counter 2 - user counter 6  Source: user input at 100-pin connector (CLK6)
 Gate: user input at 100-pin connector (GATE6)
 Output: available at 100-pin connector (OUT6)
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
Power consumption
Table 5. Power consumption specifications
Parameter Specification
+5 V operating
(A/D converting to FIFO)
0.8 A typical, 1.0 A max