3.3V Programmable Skew PLL Clock Driver TurboClock

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

The 5V991A is a high fanout 3.3V PLL based clock driver intendedfor high performance computing and data-communications applications. Akey feature of the programmable skew is the ability of outputs to lead or lagthe REF input signal. The 5V991A has eight programmable skewoutputs in four banks of 2. Skew is controlled by 3-level input signals thatmay be hard-wired to appropriate HIGH-MID-LOW levels.When the GND/sOE pin is held low, all the outputs are synchronouslyenabled. However, if GND/sOE is held high, all the outputs except 3Q0 and3Q1 are synchronously disabled.Furthermore, when the VCCQ/PE is held high, all the outputs aresynchronized with the positive edge of the REF clock input. When VCCQ/PE is held low, all the outputs are synchronized with the negative edge ofREF. Both devices have LVTTL outputs with 12mA balanced drive outputs.


  • REF is 5V tolerant
  • 4 pairs of programmable skew outputs
  • Low skew: 200ps same pair, 250ps all outputs
  • Selectable positive or negative edge synchronization:Excellent for DSP applications
  • Synchronous output enable
  • Output frequency: 3.75MHz to 85MHz
  • 2x, 4x, 1/2, and 1/4 outputs
  • 3 skew grades:IDT5V991A-2: tSKEW0<250psIDT5V991A-5: tSKEW0<500psIDT5V991A-7: tSKEW0<750ps
  • 3-level inputs for skew and PLL range control
  • PLL bypass for DC testing
  • External feedback, internal loop filter
  • 12mA balanced drive outputs
  • Low Jitter: <200ps peak-to-peak
  • Available in 32-pin PLCC Package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
5V991A-2JG Obsolete PLG32 PLCC 32 C Yes Tube Availability
5V991A-2JG8 Obsolete PLG32 PLCC 32 C Yes Reel Availability
5V991A-2JGI Obsolete PLG32 PLCC 32 I Yes Tube Availability
5V991A-5JGI Obsolete PLG32 PLCC 32 I Yes Tube Availability
5V991A-5JGI8 Obsolete PLG32 PLCC 32 I Yes Reel Availability
5V991A-7JGI Obsolete PLG32 PLCC 32 I Yes Tube Availability
5V991A-7JGI8 Obsolete PLG32 PLCC 32 I Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
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-845 Termination - LVCMOS Application Note PDF 62 KB May 12, 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
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-0504-02R2: Assembly Transfer IDT-Manila to OSE-Ph Product Change Notice PDF 38 KB Aug 3, 2005
PCN#A-0504-02R1: Assembly Transfer IDT-Manila to OSE-Ph Product Change Notice PDF 16 KB Jul 21, 2005
PCN#: A-0504-02, Transfer assembly facility IDT-Manila to OSE-Ph Product Change Notice PDF 47 KB Apr 28, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 13, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 9, 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# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 17, 1999