Measurement-computing USB-CTR04 Manuel d'utilisateur télécharger pdf (Page 19)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25°C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Counter

Table 1. Counter specifications

Parameter Specification

Counter type

FPGA

Counters

4 (each with a corresponding Input, Gate, and Output)

Counter input modes

Totalize, Pulse width, Period, Timing

Mode options Non-Recycle, Range Limit, Clear on Read, Up/Down,

Gate options

Clear|Reload, Direction Control, Gate, Count trigger; mode dependent

Resolution

Up to 64-bits (software-selectable)

Maximum input frequency

48 MHz

Debounce times

16 steps from 500 ns to 25.5 ms; positive or negative edge sensitive; glitch detect

mode or debounce mode; software-selectable.

Timebase and accuracy

96 MHz (24 MHz – 30 ppm with a 4x DLL (delay-locked loop))

Counter read pacer

Internal or external scan pacer up to 4 MHz

Period/pulse width resolution

20.83 ns; 208.3 ns; 2.083 µs; or 20.83 µs

Input type (C0IN to C3IN and

C0GT to C3GT)

Schmitt trigger, 47 kΩ pull-down to ground with 33 Ω in series

Schmitt trigger hysteresis (C0IN to

C3IN and C0GT to C3GT)

0.76 V typ

0.4 V min

1.2 V max

Input high voltage threshold (C0IN

to C3IN and C0GT to C3GT)

1.74 V typ

1.3 V min

2.2 V max

Input high voltage limit (C0IN to

C3IN and C0GT to C3GT)

5.5 V absolute max

Input low voltage threshold (C0IN

to C3IN and C0GT to C3GT)

0.98 V typ

0.6 V min

1.5 V max

Input low voltage limit (C0IN to

C3IN and C0GT to C3GT)

–0.5 V absolute min

0 V recommended min

Output high voltage

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –24 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Output current

24 mA max per pin, constrained to 240 mA across all output pins (counter outputs,

timer outputs, digital outputs, pacer clock output, and +VO)

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 25

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Measurement-computing USB-CTR04 Manuel d'utilisateur Page 19

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