GF L55LPE 55nm Spread Spectrum PLL - 60MHz-300MHz

Overview

The Spread Spectrum PLL is designed to multiply an input clock by a fixed-point number between 92 and 184 with frequency spreading capability suitable for PC and consumer electronics applications that require low EMI. It does not provide any deskew functionality. It contains a 1-64 divider at the reference clock input, a 1-256 or larger integer divider and a 1-256 or larger fractional divider in the internal feedback path, with as many as 4 bits of precise fractional-N control, and a 1-8 divider at the output. It can generate precise and adjustable frequency spreading depths (1.5% typical and up to around 10%) and rates (30KHz typical). The outputs are 50% duty cycle for all output divider values.

Key Features

  • Designed for PC, networking, and consumer-electronics applications where spread-spectrum clock sources are required to satisfy FCC requirements for peak RF spectral emissions.
  • Spreading rate and spreading depth are precisely adjustable to allow the designer to dial-in the desired characteristics.
  • 15-bit fractional-N feedback divider with 4 bits of precise control.
  • Available with multi-phase outputs.

Deliverables

  • GDSII (100% DRC and LVS clean)
  • LVS Spice netlist
  • Verilog model
  • Synopsys synthesis model
  • LEF for clock generator PLL
  • User Guidelines including:
    • integration guidelines,
    • layout guidelines,
    • testability guidelines,
    • packaging guidelines,
    • board-level guidelines

Technical Specifications

Foundry, Node
GF L55LPE
GLOBALFOUNDRIES
Pre-Silicon: 55nm
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Semiconductor IP