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87158 - Block Diagram
87158 - Pinout


1-to-6,LVPECL-to-HCSL/LVCMOS÷1,÷2,÷4 Clock Generator

The 87158 is a high performance 1-to-6 LVPECL-to- HCSL/LVCMOS ClockGenerator. The 87158 has one differential input (which can accept LVDS, LVPECL, LVHSTL, SSTL, HCSL), six differential HCSL output pairs and two complementary LVCMOS/LVTTLoutputs. The six HCSL output pairs can be individually configured for divide-by-1, 2, and 4 or high impedance by use of select pins. The two complementary LVCMOS/LVTTL outputs can be configured for divide by 2, divide by 4, high impedance, or driven low for low power operation. The primary use of the 87158 is in Intel® E8870 chipsets that use Intel® Pentium 4 processors. The 87158 converts the differential clock from the main system clock into HCSL clocks used by Intel® Pentium 4 processors. However, the 87158 is a highly flexible, general purpose device that operates up to 600MHz and can be used in any situation where Differential-to-HCSL translation is required.


  • Six HCSL outputs
  • Two LVCMOS/LVTTL outputs
  • One Differential LVPECL clock input pair
  • PCLK, nPCLK supports the following input types: LVDS, LVPECL, LVHSTL, SSTLHCSL
  • Maximum output frequency: 600MHz (maximum)
  • Output skew: 100ps (maximum)
  • Propagation delay: 4ns (maximum)
  • 3.3V operating supply
  • 0°C to 85°C ambient operating temperature
  • Available in both standard and lead-free RoHS compliant packages
  • Industrial temperature information available upon request

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)
7LVCMOS, HCSL0.000000 - 600.0000000.000000 - 600.0000001HCSL, SSTL, LVHSTL, LVDS, LVPECL33.33.31, 2, 4100

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
87158AFLFObsoletePVG48SSOP48CYesTubeCheck Availability
87158AFLFTObsoletePVG48SSOP48CYesReelCheck Availability
87158AGLFObsoletePAG48TSSOP48CYesTubeCheck Availability
87158AGLFTObsoletePAG48TSSOP48CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 13, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
show all (12)
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-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 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-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
PCN# : A1506-02 Gold wire to Copper wire Product Change Notice PDF 35 KB Oct 8, 2015
PCN#: A1309-03 Additional Assembly Sources Product Change Notice PDF 398 KB Oct 21, 2013
PCN# : A1309-01 Changed of Traceability Mark Format Product Change Notice PDF 439 KB Oct 11, 2013
show all (4)
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016

Software & Tools

Title Type Format File Size Datesort icon
87158 IBIS Model - IBIS ZIP 171 KB Nov 20, 2009