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843S304I-100 - Block Diagram
843S304I-100 - Pinout


Crystal-to-LVPECL 100MHz Clock Synthesizer

The 843S304I-100 is a PLL-based clock generator specifically designed for low phase noise applications. This device generates a 100MHz differential LVPECL clock from a 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 PCLK pins. The nominal output frequency of 100MHz may be margined by approximately ±5% by changing the M divider value via the I2C interface. 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 set the amount of spread. The 843S304I-100 is available in a lead-free 32-Lead VFQFN package.


  • Four LVPECL output pairs
  • Crystal oscillator interface: 25MHz
  • Output frequency: 100MHz
  • PCI Express Gen 2 (5 Gb/s) Jitter compliant
  • RMS phase jitter @ 100MHz (12kHz - 20MHz): 1.01ps (typical)
  • I2C support with readback capabilities up to 400kHz
  • Spread Spectrum for electromagnetic interference (EMI) reduction
  • 3.3V operating supply mode
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Specification

Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
LVPECL94.792000 - 105.20800025.0000002LVPECL, Crystal13.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
843S304BKI-100LFActiveNLG32P3VFQFPN32IYesTrayCheck Availability
843S304BKI-100LFTActiveNLG32P3VFQFPN32IYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
ICS843S304I-100 Datasheet Datasheet PDF 461 KB Jan 6, 2016
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 28, 2016
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015

Software & Tools

Title Type Format File Size Datesort icon
ICS843S304I-100 IBIS Model Model - IBIS ZIP 41 KB Oct 30, 2009