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845264I - Block Diagram
845264I - Pinout

845264I

FemtoClock® Crystal-to-CML Clock Generator

The ICS845264I is a 3.3V, 2.5V CML clock generator designed for Ethernet applications. The device synthesizes four clock frequencies on two separately selectable output banks. Each bank has either a 62.5MHz, 125MHz, 156.25MHz or 312.5MHz clock signal with excellent phase jitter performance. Each clock frequency is distributed to two low-skew differential CML output banks with a total of four outputs. The device is suitable for driving the reference clocks of Ethernet PHYs. The device supports 3.3V and 2.5V voltage supply and is packaged in a small, lead-free (RoHS 6) 32-lead VFQFN package. The extended temperature range supports telecommunication, wireless infrastructure and networking end equipment requirements.

Features

  • Clock generation of: 62.5MHz, 125MHz, 156.25MHz and 312.5MHz
  • Two banks of two differential CML clock outputs
  • Crystal interface designed for 25MHz, 12pF parallel resonant crystal such as the IDT 603-25-173 (25 MHz)
  • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz – 20MHz): 0.486ps (typical)
  • Offset Single-side Band Phase Noise
100Hz ……………………….-97 dBc/Hz
1kHz………………………….-118 dBc/Hz
10kHz………………………..-125 dBc/Hz
100kHz………………………-123 dBc/Hz
  • LVCMOS interface levels for the control inputs
  • Full 3.3V and 2.5V supply voltage
  • Lead-free (RoHS 6) 32 VFQFN packaging
  • -40°C to 85°C ambient operating temperature

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
845264AKILFActiveNLG32P3VFQFPN32IYesTrayCheck Availability
845264AKILFTActiveNLG32P3VFQFPN32IYesReelCheck Availability

Documents

Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
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ICS845264I Datasheet Datasheet PDF 288 KB Jul 24, 2015