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5V9955 - Block Diagram
5V9955 - Pinout


3.3V Programmable Skew Dual PLL Clock Driver TurboClock™ W

The IDT5V9955 is a high fanout 3.3V PLL based clock driver intended for high performance computing and data-communications applications. A key feature of the programmable skew is the ability of outputs to lead or lag the REF input signal. The IDT5V9955 has sixteen programmable skew outputs in eight banks of 2. The two separate PLLs allow the user to independently control A and B banks. Skew is controlled by 3-level input signals that may be hard-wired to appropriate HIGH-MID-LOW levels. The feedback input allows divide-by-functionality from 1 to 12 through the use of the xDS[1:0] inputs. This provides the user with frequency multiplication from 1 to 12 without using divided outputs for feedback. When the xsOE pin is held low, all the xbank outputs are synchronously enabled. However, if xsOE is held high, all the xbank outputs except x2Q0 and x2Q1 are synchronously disabled. The xLOCK is high when the xbank PLL has achieved phase lock. Furthermore, when xPE is held high, all the outputs are synchronized with the positive edge of the REF clock input. When xPE is held low, all the xbank outputs are synchronized with the negative edge of REF. The IDT5V9955 has LVTTL outputs with 12mA balanced drive outputs.


  • Ref input is 5V tolerant
  • 8 pairs of programmable skew outputs
  • Two separate A and B banks for individual control
  • Low skew: 185ps same pair, 250ps same bank, 350ps both banks
  • Selectable positive or negative edge synchronization on each bank: excellent for DSP applications
  • Synchronous output enable on each bank
  • Input frequency: 2MHz to 200MHz
  • Output frequency: 6MHz to 200MHz
  • 3-level inputs for skew and PLL range control
  • 3-level inputs for feedback divide selection multiply / divide ratios of (1-6, 8, 10, 12) / (2, 4)
  • PLL bypass for DC testing
  • External feedback, internal loop filter
  • 12mA balanced drive outputs
  • Low Jitter: <125ps cycle-to-cycle
  • Power-down mode on each bank
  • Lock indicator on each bank
  • Available in BGA package
  • Not Recommended for New Design

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
16LVCMOS6.000000 - 200.0000002.000000 - 200.0000001LVCMOS83.33.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
5V9955BFGIObsoleteBFG96CABGA96IYesTrayCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Apps 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 13, 2014
show all (18)
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 13, 2014
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-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 8, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 6, 2014
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 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-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 15, 2014
AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PDN# : CQ-13-02 (R1) PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 601 KB Dec 22, 2013
PDN# : CQ-13-02 Q2FY14 Quarter PDN for Manufacturing Discontinuance Product Discontinuation Notice PDF 327 KB Oct 27, 2013