Overview

The 309 is a versatile serially-programmable, triple PLL with spread spectrum clock source. The 309 can generate any frequency from 250kHz to 200 MHz, and up to 6 different output frequencies simultaneously. The outputs can be reprogrammed on-the-fly, and will lock to a new frequency in 10 ms or less. To reduce system EMI emissions, spread spectrum is available that supports modulation frequencies of 31 kHz and 120 kHz, as well as modulation amplitudes of +/-0.25% to +/-2.0%. Both center and down-spread options are available. The device includes a PDTS pin which tri-states the output clocks and powers down the entire chip. The 309 default for non-programmed start-up are buffered reference clock outputs on all clock output pins. IDT's VersaClockTM programming software allows the user to configure up to 9 outputs with target frequencies, spread spectrum capabilities or buffered reference clock outputs. The VersaClockTM software automatically configures the PLLs for optimal overall performance.

309 - Block Diagram
309 - Pinout
309 - Block Diagram
309 - Pinout
  • Packaged in 20-pin SSOP (QSOP) – Pb-free, RoHS compliant
  • Highly accurate frequency generation
  • M/N Multiplier PLL: M = 1..2048, N = 1..1024
  • Serially programmable: user determines the output frequency via a 3-wire interface
  • Spread Spectrum frequency modulation for reduced system EMI

Documentation

Design & Development

Software Downloads
Type Title Date
Software & Tools - Software
VersaClock II Desktop Software Setup
Log in to Download ZIP 6.24 MB
1 item

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    309RILF
    circleObsolete
    memory
    view_in_ar
    		QSOP 20 I Yes Tube
    309RILFT
    circleObsolete
    memory
    view_in_ar
    		QSOP 20 I Yes Reel
    309RLF
    circleObsolete
    memory
    view_in_ar
    		QSOP 20 C Yes Tube
    309RLFT
    circleObsolete
    memory
    view_in_ar
    		QSOP 20 C Yes Reel
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