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DNR-CT-601
DNR-CT-601
8-channel, 32-bit counter/timer board for the PowerDNR RACKtangle®
 
The DNR-CT-601 is a general-purpose counter/timer layer that provides eight independent 32-bit channels, each one having overvoltage protection and optoisolation. They perform up/down counting in a number of flexible modes using values from a Load Register and two Compare Registers. They can act as an event counter, perform width/period measurements and run in quadrature-encode mode where the user sets the direction of the counting.
 
Characteristics:
  • 8 independent counter/timer units
  • Start/pause/stop all channels simultaneously
  • 32-bit prescaler per channel; quadrature encoder support
  • Multiple period counter with accumulated results
  • Works with either internal (66 MHz) or external (max 16.5 MHz) timebases
  • 256 x 32-bit Input FIFO and 256 x 32-bit Output FIFO on each counter
  • Debouncing/glitch removal on external clock and gate inputs
  • 16 interrupt sources on every counter
  • 8 Counting modes
 
Technical Specifications
General
Number of counter/timer units 8
Resolution 32 bits
Prescaler (per channel) 1 (32 bits)
Maximum frequency 16.5 MHz for external input clock; 
66 MHz for internal input clock; 
33 MHz for outputs
Minimum frequency no low limits
Internal 66 MHz time base (from backplane clock signal) Initial accuracy: ±10 ppm
Temp drift: ±15 ppm over full temp range
Time drift: ±5 ppm year one, then lower
On-board FIFOs, per counter Input: 256 x 32; Output: 256 x 32
Minimum pulse width 15.15 nsec
Minimum period 30.30 nsec
Pulse-width/period accuracy 2 internal clock cycles (30 nsec) on one or multiple periods
Debouncer circuit size 32 bits (on GATE and CLKIN)
Compare registers per counter 2
External gates per counter 1, programmable polarity
External triggers per counter 1 (shared with Gate), edge sensitive, programmable polarity
Protection 7 kV ESD, 350V isolation
Input High / Low voltage 2.0-5.0V / 0.0-0.8V
Output High / Low voltage >2.0 V / <0.8V @ ±12 mA
Power consumption 2W
Operating range Tested -40 to +85 °C
Humidity range 0 - 95%, noncondensing
Vibration IEC 60068-2-6 5 g, 10-500 Hz, sinusoidal
IEC 60068-2-64 5 g (rms), 10-500 Hz, broad-band random
Shock IEC 60068-2-27 50 g, 3 ms half sine, 18 shocks @ 6 orientations
30 g, 11 ms half sine, 18 shocks @ 6 orientations