The 8P391208 is intended to take 1 or 2 reference clocks, select between them using a pin selection, and generate up to 8 outputs that are the same as the reference frequency. The 8P391208 supports two output banks, each with its own power supply. All outputs in one bank would generate the same output frequency, and each bank can be individually controlled for output type or output enable. The device can operate over the -40 to +85°C temperature range.


  • Accepts input frequencies ranging from 1PPS (1Hz) to 700MHz (1GHz in 3.3V HCSL mode)
  • 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, HCSL or CML
  • Each bank supports a separate power supply of 3.3V, 2.5V or 1.8V
  • CML outputs support two different voltage swings
  • Individual output enables and output type selection supported
  • Output noise floor of –153dBc/Hz @ 156.25MHz
  • Core voltage supply of 3.3V, 2.5V or 1.8V
  • -40 to +85°C ambient operating temperature
  • Lead-free (RoHS 6) QFN-32 (5mm x 5mm) packaging

tuneProduct Options

Part Number 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


Title language Type Format File Size Date
Datasheets & Errata
star 8P391208 Datasheet Datasheet PDF 762 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-815 Understanding Jitter Units Application Note PDF 565 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
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
RF Timing Family Product Overview Overview PDF 331 KB
Clock Distribution Overview 日本語 Overview PDF 217 KB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB