Overview

The 840N021 is a LVCMOS/LVTTL clock synthesizer designed for Ethernet applications. The device generates a 125MHz clock signal from a 25MHz crystal with excellent phase jitter performance. The device uses Renesas' fourth generation FemtoClock® NG technology for an optimum of high clock frequency, low phase noise performance and low power consumption. It supports 2.5V or 3.3V voltage supply and is packaged in a small, lead-free (RoHS 6) 8-lead TSSOP package. The extended temperature range supports wireless infrastructure, telecommunication, and networking end equipment requirements.

840N021I - Block Diagram
840N021I - Pinout
840N021I - Block Diagram
840N021I - Pinout
  • Fourth generation FemtoClock NG technology
  • 125MHz output clock synthesized from a 25MHz fundamental mode crystal
  • One 2.5V or 3.3V LVCMOS/LVTTL clock output
  • Crystal interface designed for a 12pF parallel resonant crystal
  • RMS phase jitter at 125MHz, using a 25MHz crystal (1.875MHz to 20MHz): 0.156ps (maximum)
  • RMS phase jitter at 100MHz, using a 20MHz crystal (12kHz to 20MHz): 0.451ps (maximum)
  • LVCMOS interface level for the output enable input
  • Full 2.5V or 3.3V supply voltage
  • Lead-free (RoHS 6) packaging
  • -40 °C to 85 °C ambient operating temperature​

Documentation

Design & Development

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
    840N021BGILF
    circleObsolete
    memory
    view_in_ar
    		TSSOP 8 I Yes Tube
    840N021BGILFT
    circleObsolete
    memory
    view_in_ar
    		TSSOP 8 I Yes Reel
    Parametric Table tips

    Tips for Using This Parametric Table:

    • Hide Filters button in header: Collapse or expands filters
    • Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
    • Reset button in header: Reset all filters to the page default
    • Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
    • Export button in header: Export the filtered results of the table to an Excel document
    • Filter parts search bar in header: Type to filter table results by part number
    • Hide column button in column headers: Select to hide columns in table
    • AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
    • Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
    • Document icon next to product name in row: View the featured document for this product
    • Chip icon next to the right of the document icon in row: View the block diagram for this product
    • Cart icon to the right of the chip icon: Indicates that samples are available for this product