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 Options

Orderable Part ID Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Active VFQFPN 32 I Yes Tray
Active VFQFPN 32 I Yes Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ICS843S304I-100 Datasheet Datasheet PDF 558 KB
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility Product Change Notice PDF 983 KB
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location Product Change Notice PDF 583 KB
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB
ICS843S304I-100 IBIS Model Model - IBIS ZIP 41 KB