Overview

The 842S104E is a PLL-based clock generator specifically designed for PCI Express™ Clock Generation 2 applications. This device generates either a 200MHz or 100MHz differential HSTL clock from an input reference of 25MHz. The input reference may be derived from an external source or by the addition of a 25MHz crystal to the on-chip crystal oscillator. An external reference is applied to the XTAL_IN pin with the XTAL_OUT pin left floating.The device offers spread spectrum clock output for reduced EMI applications. An I2C bus interface is used to enable or disable spread spectrum operation as well as select either a down spread value of -0.35% or -0.5%.The 842S104E is available in a lead-free 24-Lead package.

842S104E - Block Diagram
842S104E - Pinout
842S104E - Block Diagram
842S104E - Pinout
  • Four differential HSTL output pairs
  • Crystal oscillator interface: 25MHz
  • Output frequency: 100MHz or 200MHz
  • RMS phase jitter @ 200MHz (12kHz - 20MHz): 1.229ps (typical)
  • Cycle-to-cycle jitter: 25ps (maximum)
  • I2C support with readback capabilities up to 400kHz
  • Spread Spectrum for electromagnetic interference (EMI) reduction
  • 3.3V core/1.5V to 2.0V output operating supply
  • 0°C to 70°C ambient operating temperature
  • Available lead-free (RoHS 6) package
  • PCI Express Gen2 Jitter Compliant

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.

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Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    842S104EGLF
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Tube
    842S104EGLFT
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Reel
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