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

The QS5917T Clock Driver uses an internal phase locked loop (PLL) to lock low skew outputs to one of two reference clock inputs. Eight outputs are available: Q0-Q4, 2xQ, Q/2, Q5. Careful layout and design insures < 500ps skew between the Q0-Q4, and Q/2 outputs. The QS5917T includes an internal RC filter which provides excellent jitter characteristics and eliminates the need for external components. In addition, TTL level outputs reduce clock signal noise. Various combinations of feedback and a divide-by-2 in the VCO path allow applications to be customized for linear VCO operation over a wide range of input SYNC frequencies. The VCO can also be disabled by the PLL_EN signal to allow low frequency or DC testing. The LOCK output asserts to indicate when phase lock has been achieved. The QS5917T is designed for use in high-performance workstations, multi-board computers, networking hardware, and mainframe systems. Several can be used in parallel or scattered throughout a system for guaranteed low skew, system-wide clock distribution networks. For more information on PLL clock driver products, see Application Note AN-227.


  • 5V operation
  • 2xQ output, Q/2 output, Q output
  • Outputs tri-state while RST low
  • Internal loop filter RC network
  • Low noise TTL level outputs
  • < 500ps output skew, Q0-Q4
  • PLL disable feature for low frequency testing
  • Balanced Drive Outputs ± 24mA
  • 132MHz maximum frequency (2xQ output)
  • Functional equivalent to Motorola MC88915
  • ESD > 2000V
  • Latch-up > –300mA
  • Available in QSOP and PLCC packages
  • Not Recommended for New Design

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
QS5917T-100TQG Obsolete PCG28 QSOP 28 C Yes Tube
QS5917T-132TQG Obsolete PCG28 QSOP 28 C Yes Tube
QS5917T-70TJG Obsolete PLG28 PLCC 28 C Yes Tube

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
QS5917T Data Sheet Datasheet PDF 64 KB Jan 16, 2014
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 7, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 6, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 6, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 5, 2014
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 5, 2014
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 4, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 23, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 11, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 14, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 14, 2014
AN-01: Ground Bounce Noise in TTL Logics Application Note PDF 135 KB Oct 31, 1997
AN-43: High-Speed Clocking Device Power Supply Application Note PDF 41 KB May 31, 1997
AN-82 Clock Distribution with Guaranteed Skew Application Note PDF 146 KB May 31, 1996
AN-82 Clock Distribution with Guaranteed Skew Application Note PDF 146 KB May 31, 1996
PDN# : CQ-13-02 (R1) PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 601 KB Dec 21, 2013
PDN# : CQ-13-02 Q2FY14 Quarter PDN for Manufacturing Discontinuance Product Discontinuation Notice PDF 327 KB Oct 26, 2013
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 13, 2012
PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB Dec 15, 2005
PCN# A-0508-02: OSET Alternate Assembly Location for Green Product Change Notice PDF 18 KB Sep 1, 2005
PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB Apr 28, 2005
PCN # A-0406-07Rev.1, Qualify OSE-Taiwan for SSOP & TSSOP Product Change Notice PDF 21 KB Oct 21, 2004
PCN#:A-0312-02, new die attach material - 8290 Product Change Notice PDF 116 KB Dec 2, 2003
PCN#:A-0312-01, new mold compound material - G600 Product Change Notice PDF 109 KB Dec 2, 2003
PCN#: A-0309-04, new mold compound G600 material Product Change Notice PDF 134 KB Oct 6, 2003
PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 15, 2002
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 10, 2001
PCN# L0011-02: Data Sheet Change Product Change Notice PDF 88 KB Nov 12, 2000
PCN# G0005-01, Laser Top Mark Product Change Notice PDF 24 KB May 9, 2000
PCN# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 17, 1999