NOTICE - The following device(s) are recommended alternatives:

The 844625I is a high frequency clock generator. The 844625I uses an external 25MHz crystal to synthesize 312.5MHz, 156.25MHz and 125MHz clocks. The 844625I has excellent cycle-to-cycle and RMS period jitter performance. The 844625I operates at full 3.3V, 2.5V or mixed 3.3V, 2.5V supply modes and is available in a fully RoHS compliant 48-lead TQFP, E-Pad package.

Features

  • Ten selectable differential LVDS outputs
  • Output frequencies of 312.5MHz, 156.25MHz or 125MHz using a 25MHz crystal.
  • Crystal oscillator interface designed for 18pF, 25MHz parallel resonant crystal
  • Cycle-to-cycle jitter: 18ps (typical)
  • RMS phase jitter at 125MHz (1.875MHz - 20MHz): 0.379ps (typical), VDD = 3.3V
  • RMS phase jitter at 156.25MHz (1.875MHz - 20MHz): 0.376ps (typical), VDD = 3.3V
  • Output duty cycle: 50%, (typical)
  • Supply modes: VDD / VDDA / VDDO 3.3V / 3.3V / 3.3V 2.5V / 2.5V / 2.5V 3.3V / 3.3V / 2.5V
  • -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 Package Buy Sample
844625BYILF Obsolete PTQFP 48 I Yes Tray Package Info
Availability
844625BYILFT Obsolete PTQFP 48 I Yes Reel Package Info
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ICS844625I Datasheet Datasheet PDF 415 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-831 The Crystal Load curve Application Note PDF 395 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 170 KB
AN-846 Termination - LVDS Application Note PDF 133 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 128 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 115 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 160 KB
AN-832 Timing Budget and Accuracy Application Note PDF 131 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 120 KB
AN-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-837 Overdriving the Crystal Interface Application Note PDF 133 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 143 KB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-801 Crystal-High Drive Level Application Note PDF 202 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
PCNs & PDNs
PDN# : CQ-16-01 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 552 KB
Other
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Products for Radio Applications 日本語 Product Brief PDF 2.34 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB