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 Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
5T9955BFGI Obsolete BFG96 CABGA 96 I Yes Tray Availability
5T9955BFGI8 Obsolete BFG96 CABGA 96 I Yes Reel Availability
5T9955BFI Obsolete BF96 CABGA 96 I No Tray Availability
5T9955BFI8 Obsolete BF96 CABGA 96 I No 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-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-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 5, 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-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
PCNs & PDNs
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 13, 2012
PCN# : A0610-01R1 TRANSFER OF IDT PENANG ASSEMBLY TO AIT Product Change Notice PDF 173 KB Mar 11, 2007
PCN# : A-0610-02 ASAT China as Alternate Facility for CABGA/CVBGA/FPBGA/TQFP/PQFP Product Change Notice PDF 252 KB Oct 18, 2006
PCN# A-0607-05 Green Mold Compound KMC3580 for BGA Product Change Notice PDF 194 KB Aug 29, 2006
PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB Dec 15, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 13, 2004
PCN#: A-0403-03, BGA package family Product Change Notice PDF 38 KB Dec 8, 2004
PCN # L-0412-02 Tape-&-Reel Quantity Change Product Change Notice PDF 80 KB Dec 7, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 9, 2003
PCN#:A-0305-02, new m/c G770 & 2300 d/a material Product Change Notice PDF 197 KB Jun 3, 2003
Other
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 24, 2016