11/19

www.ni.com

General-Purpose Counter/Timers

Number of counter/timers

4

Resolution

32 bits

Counter measurements

Edge counting, pulse, pulse width, semi-period, period, two-edge separation

Position measurements

X1, X2, X4 quadrature encoding with Channel Z reloading;

two-pulse encoding

Output applications

Pulse, pulse train with dynamic updates, frequency division, equivalent time

sampling

Internal base clocks

100 MHz, 20 MHz, 100 kHz

External base clock frequency

0 MHz to 25 MHz

Base clock accuracy

50 ppm

Inputs

Gate, Source, HW_Arm, Aux, A, B, Z, Up_Down, Sample Clock

Routing options for inputs

NI PCIe-6351/6353

Any PFI, RTSI, analog trigger, many internal signals

NI USB-6351/6353

Any PFI, analog trigger, many internal signals

FIFO

127 samples per counter

Data transfers

NI PCIe-6351/6353

Dedicated scatter-gather DMA controller for each counter/timer,

programmed I/O

NI USB-6351/6353

USB Signal Stream, programmed I/O

Frequency Generator

Number of channels

1

Base clocks

20 MHz, 10 MHz, 100 kHz

Divisors

1 to 16

Base clock accuracy

50 ppm

Output can be available on any PFI or RTSI terminal.

Phase-Locked Loop (PLL)

Number of PLLs

1

Reference clock locking frequencies

Reference Signal Locking Input Frequency (MHz)

PCIe

USB

RTSI <0..7>

10, 20

—

PFI <0..15>

10, 20

10

Output of PLL

100 MHz Timebase; other signals derived from 100 MHz Timebase

including 20 MHz and 100 kHz Timebases