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87946I-01 - Block Diagram
87946I-01 - Pinout


1-to-10 Low Skew, ÷1,÷2 LVCMOS/LVTTL 2.5V, 3.3V Fanout Buffer

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

The 87946I-01 is a low skew, ÷1, ÷2 Fanout Buffer. The 87946I-01 has one LVPECL clock input pair. The PCLK/nPCLK pair can accept LVPECL, CML, or SSTL input levels. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased from 10 to 20 by utilizing the ability of the outputs to drive two series terminated lines. The divide select inputs, DIV_SELx, control the output frequency of each bank. The outputs can be utilized in the ÷1, ÷2 or a combination of ÷1 and ÷2 modes. The master reset input, MR/nOE, resets the internal frequency dividers and also controls the active and high impedance states of all outputs. The 87946I-01 is characterized at 3.3V core/3.3V output and 3.3V core/2.5V output. Guaranteed bank, output and part-to-part skew characteristics make the 87946I-01 ideal for those clock distribution applications demanding well defined performance and repeatability.


  • Ten single ended LVCMOS/LVTTL outputs, 7Ω typical output impedance
  • LVPECL clock input pair
  • PCLK/nPCLK supports the following input levels: LVPECL, CMLSSTL
  • Maximum input frequency: 250MHz
  • Output skew: 120ps (maximum)
  • Part-to-part skew: 700ps (maximum)
  • Multiple frequency skew: 320ps (maximum)
  • Additive phase jitter, RMS: 0.19ps (typical)
  • 3.3V core, 3.3V or 2.5V output supply modes-40°C to 85°C ambient operating temperature
  • Available in both standard (RoHS 5) and lead-free (RoHS 6) packages

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)Divider ValueOutput Skew (ps)Additive Phase Jitter Typ RMS (ps)
10LVCMOS0.000000 - 250.0000000.000000 - 250.0000001LVPECL, SSTL, CML33.32.5, 3.31, 21200.19

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
87946AYI-01LFLast Time BuyPRG32TQFP32IYesTrayCheck Availability
87946AYI-01LFTLast Time BuyPRG32TQFP32IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
87946I-01 Datasheet Datasheet PDF 240 KB Sep 20, 2016
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 13, 2014
show all (14)
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 6, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
Netcom LVCMOS Power Dissipation Application Note PDF 310 KB Mar 16, 2006
Netcom LVCMOS Driver Termination Application Note PDF 147 KB Mar 16, 2006
PDN# : CQ-16-01 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 552 KB May 4, 2016
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 14, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 15, 2016
show all (7)
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
PCN# : A1401-02 Alternate Copper Wire Assembly Site Product Change Notice PDF 36 KB Feb 16, 2014
PCN# : TB1303-01 Change of Carrier Tape for TQFP-32, TQFP-48 Product Change Notice PDF 472 KB Mar 31, 2013
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016

Software & Tools

Title Type Format File Size Datesort icon
87946I-01 IBIS Model - IBIS ZIP 74 KB Nov 5, 2009