Measurement Computing PCIe-DAS1602/16 - Manual (Page 20)

PCIe-DAS1602/16 User's Guide Specifications
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Counter
Counter type 82C54
Configuration 3 down counters, 16 bits each
Counter 1 source (software-selectable)
 External source from main connector: pin 21 (Note3)
 100 kHz internal source
Counter 1 gate External gate from main connector: pin 24 (Note3)
Counter 1 output Available at main connector: pin 2
Counter 2 source (jumper-selectable)
 Internal 1 MHz
 Internal 10 MHz
Counter 2 gate (software-selectable) External source from main connector: pin 25 (Note3)
Counter 2 output Internal only, chained to counter 3 source
Counter 3 source Counter 2 output
Counter 3 gate (software-selectable) External source from main connector: pin 25 (Note3)
Counter 3 output Available at main connector: pin 20
Programmable as ADC pacer clock.
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 high 2.0 V min, 5.5 V absolute max
Input low 0.8 V max, –0.5 V absolute min
Output high 3.0 V min @ –2.5 mA
Output low 0.4 V max @ 2.5 mA
Crystal oscillator frequency 10 MHz
Frequency accuracy 50 ppm
Note 3: Pins 21, 24, and 25 are pulled to logic high via 47 K resistors.
Environmental
Operating temperature range 0 °C to 70 °C
Storage temperature range –40 °C to 100°C
Humidity 0% to 95% non-condensing
Mechanical
Card dimensions (L × W × H) 168 × 111 × 19 mm (6.6 × 4.4 × 0.7 in.)