The 8P791208 is a low additive jitter 2:8 buffer with CMOS / differential outputs. The device takes 1 or 2 reference clocks, selects between them, using a pin selection and generates up to 8 outputs that are the same as the reference frequency. The 8P791208 supports two output banks, each with its own power supply. All outputs in one bank generate the same output frequency, but each output can be individually controlled for output type or output enable. The device can operate over the -40°C to 85°C temperature range.


  • Accepts input frequencies ranging from 1PPS (1Hz) to 700MHz
  • Two differential inputs support LVPECL, LVDS, LVHSTL, HCSL or LVCMOS reference clocks
  • Generates 8 differential or 16 LVCMOS outputs
  • Outputs arranged in two banks of four outputs each
  • Select pins control which input drives which of two output banks
  • Controlled by 3-level input pins that are 3.3V-tolerant for all core voltages
  • Output type may be selected from LVPECL, LVDS or 2xLVCMOS
  • Each bank supports a separate power supply of 3.3V, 2.5V or
  • LVCMOS outputs are limited to 125MHz maximum and support swings of 3.3V, 2.5V, 1.8V and 1.5V
  • Individual output enables and output type selection supported
  • Output noise floor of –158dBc/Hz @ 156.25MHz
  • Core voltage supply of 3.3V, 2.5V or 1.8V
  • -40°C to +85°C ambient operating temperature
  • Lead-free (RoHS 6) QFN-32 (5 × 5 mm) packaging

Product Options

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

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
8P791208 Datasheet Datasheet PDF 625 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 170 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-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility Product Change Notice PDF 983 KB
Clock Distribution Overview 日本語 Overview PDF 217 KB
RF Timing Family Product Overview Overview PDF 464 KB
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