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5T9955 - Block Diagram

5T9955

2.5V Programmable Skew Dual PLL Clock Driver

The 5T9955 is a high fanout 2.5V 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 5T9955 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 output 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 outputs are synchronized with the negative edge of REF. The 5T9955 has LVTTL outputs with 12mA balanced drive outputs.

Features

  • Ref input is 3.3V tolerant
  • 8 pairs of programmable skew outputs
  • 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 160MHz
  • Output frequency: 6MHz to 160MHz
  • 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: <100ps 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

Additive Phase Jitter Typ RMS (ps)Output Skew (ps)Core Voltage (V)Inputs (#)Input TypeInput Freq (MHz)Output Voltage (V)Outputs (#)Output TypeOutput Freq Range (MHz)

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
5T9955BFGIObsoleteBFG96CABGA96IYesTrayCheck Availability
5T9955BFGI8ObsoleteBFG96CABGA96IYesReelCheck Availability
5T9955BFIObsoleteBF96CABGA96INoTrayCheck Availability
5T9955BFI8ObsoleteBF96CABGA96INoReelCheck Availability

Documents

Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Apps Notes & White Papers
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AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
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AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
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AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
show all (8)
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AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
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AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
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AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
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AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
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AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCNs & PDNs
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PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
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PCN# : A0610-01R1 TRANSFER OF IDT PENANG ASSEMBLY TO AIT Product Change Notice PDF 173 KB Mar 12, 2007
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PCN# : A-0610-02 ASAT China as Alternate Facility for CABGA/CVBGA/FPBGA/TQFP/PQFP Product Change Notice PDF 252 KB Oct 19, 2006
show all (10)
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PCN# A-0607-05 Green Mold Compound KMC3580 for BGA Product Change Notice PDF 194 KB Aug 30, 2006
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PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB Dec 16, 2005
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PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
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PCN#: A-0403-03, BGA package family Product Change Notice PDF 38 KB Dec 9, 2004
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PCN # L-0412-02 Tape-&-Reel Quantity Change Product Change Notice PDF 80 KB Dec 8, 2004
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PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 10, 2003
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PCN#:A-0305-02, new m/c G770 & 2300 d/a material Product Change Notice PDF 197 KB Jun 4, 2003
Other
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IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016