The 87972I-147 is a low skew, LVCMOS/LVTTL Clock Generator and a member of the family of High Performance Clock Solutions from IDT. The 87972I-147 has three selectable inputs and provides 14 LVCMOS/LVTTL outputs. The 87972I-147 is a highly flexible device. Using the crystal oscillator input, it can be used to generate clocks for a system. All of these clocks can be the same frequency or the device can be configured to generate up to three different frequencies among the three output banks. Using one of the single ended inputs, the 87972I-147 can be used as a zero delay buffer/multiplier/ divider in clock distribution applications. The three output banks and feedback output each have their own output dividers which allows the device to generate a multitude of different bank frequency ratios and output-to-input frequency ratios. In addition, 2 outputs in Bank C (QC2, QC3) can be selected to be inverting or non-inverting. The output frequency range is 10MHz to 150MHz. Input frequency range is 6MHz to 150MHz. The 87972I-147 also has a QSYNC output which can be used or system synchronization purposes. It monitors Bank A and Bank C outputs and goes low one period of the faster clock prior to coincident rising edges of Bank A and Bank C clocks. QSYNC then goes high again when the coincident rising edges of Bank A and Bank C occur. This feature is used primarily in applications where Bank A and Bank C are running at different frequencies, and is particularly useful when they are running at non-integer multiples of one another.

Features

  • Fully integrated PLL
  • Fourteen LVCMOS/LVTTL outputs
  • (12)clocks, (1)feedback, (1)sync
  • Selectable crystal oscillator interface or LVCMOS/LVTTL reference clock inputs
  • CLK0, CLK1 can accept the following input levels: LVCMOS or LVTTL
  • Output frequency range: 10MHz to 150MHz
  • VCO range: 240MHz to 500MHz
  • Output skew: 200ps (maximum)
  • Cycle-to-cycle jitter, (all banks ÷4): 55ps (maximum)
  • Full 3.3V supply voltage
  • -40°C to 85°C ambient operating temperature
  • Compatible with PowerPC™ and Pentium™ Microprocessors
  • Available in lead-free (RoHS 6) package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
87972DYI-147LF Last Time Buy PPG52 TQFP 52 I Yes Tray
Availability
87972DYI-147LFT Last Time Buy PPG52 TQFP 52 I Yes Reel
Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
87972I-147 Datasheet Datasheet PDF 306 KB
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-845 Termination - LVCMOS Application Note PDF 62 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB
AN-815 Understanding Jitter Units Application Note PDF 476 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB
PCNs & PDNs
PDN# : CQ-19-01(R1) Quarterly Market Declined PDN Product Discontinuation Notice PDF 1014 KB
PDN# : CQ-19-01 Quarterly Market Declined PDN Product Discontinuation Notice PDF 537 KB
PCN# : A1401-02 Alternate Copper Wire Assembly Site Product Change Notice PDF 36 KB
PDN# : N-12-22R2 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 363 KB
Other
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB

Software & Tools

Title Other Languages Type Format File Size Date
87972I-147 IBIS Model Model - IBIS ZIP 6 KB