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
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB
AN-815 Understanding Jitter Units Application Note PDF 476 KB
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB
PCNs & PDNs
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB
PCN# : A0610-01R1 TRANSFER OF IDT PENANG ASSEMBLY TO AIT Product Change Notice PDF 173 KB
PCN# : A-0610-02 ASAT China as Alternate Facility for CABGA/CVBGA/FPBGA/TQFP/PQFP Product Change Notice PDF 252 KB
PCN# A-0607-05 Green Mold Compound KMC3580 for BGA Product Change Notice PDF 194 KB
PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB
PCN#: A-0403-03, BGA package family Product Change Notice PDF 38 KB
PCN # L-0412-02 Tape-&-Reel Quantity Change Product Change Notice PDF 80 KB
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB
PCN#:A-0305-02, new m/c G770 & 2300 d/a material Product Change Notice PDF 197 KB
Other
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB