Crystal-to-LVDS/LVCMOS Frequency Synthesizer

The 844S012I-01 is an optimized PCIe, sRIO and Gigabit Ethernet Frequency Synthesizer. The 844S012I-01 uses a 25MHz parallel resonant crystal to generate 33.33MHz - 200MHz clock signals, replacing solutions requiring multiple oscillator and fanout buffer solution. The device supports ±0.25% center-spread, and -0.6% down-spread clocking with two spread select pins (SSC[1:0]). The VCO operates at frequency of 2GHz. The device has three output banks: Bank A with two LVDS outputs, 100MHz – 250MHz; Bank B with seven 33.33MHz – 200MHz LVCMOS/ LVTTL outputs; and Bank C with one 33.33MHz – 200MHz LVCMOS/LVTTL output.

All Banks A, B and C have their own dedicated frequency select pins and can be independently set for the frequencies mentioned above. The low jitter characteristic of the 844S012I-01 makes it an ideal clock source for PCIe, sRIO and Gigabit Ethernet applications. Designed for networking and industrial applications, the 844S012I-01 can also drive the high-speed clock inputs of communication processors, DSPs, switches and bridges. The 843241I-04 is a Serial ATA (SATA)/Serial Attached SCSI (SAS) Clock Generator and a member of the HiPerClocksTM family of high performance devices from IDT. For SATA/SAS applications, a 25MHz crystal is used to produce 150MHz. The 843241I-04 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.

Features

  • Two differential LVDS outputs (Bank A), configurable for PCIe (100MHz or 250MHz) and sRIO (100MHz or 125MHz) clock signals
  • Eight LVCMOS/LVTTL outputs (Bank B/C), 18Ω typical output impedance
  • Two REF_OUT LVCMOS/LVTTL clock outputs 23Ω typical output impedance
  • Selectable crystal oscillator interface, 25MHz, 18pF parallel resonant crystal or one LVCMOS/LVTTL single-ended reference clock input
  • Supports the following output frequencies: LVDS Bank A: 100MHz, 125MHz, 200MHz and 250MHz LVCMOS/LVTTL Bank B/C: 33.33MHz, 50MHz, 66.67MHz, 100MHz, 125MHz, 133.33MHz, 166.67MHz and 200MHz
  • VCO: 2GHz
  • Spread spectrum clock: ±0.25% center-spread, and -0.6% down-spread
  • PLL bypass and output enable
  • RMS period jitter: 23ps (maximum), QB outputs
  • Full 3.3V supply voltage
  • -40°C to 85°C ambient operating temperature
  • Available in a lead-free (RoHS 6) compliant package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
844S012BKI-01LF Active NLG56P3 VFQFPN 56 I Yes Tray Availability
844S012BKI-01LFT Active NLG56P3 VFQFPN 56 I Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
844S012i-01 Final Data Sheet Datasheet PDF 374 KB Jan 4, 2016
Application 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-846 Termination - LVDS Application Note PDF 50 KB May 12, 2014
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 12, 2014
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-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 10, 2014
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 7, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 6, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 6, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 5, 2014
AN-837 Overdriving the Crystal Interface Application Note PDF 50 KB May 5, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 5, 2014
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 5, 2014
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 4, 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-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 11, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 14, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 14, 2014
PCNs & PDNs
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 21, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 20, 2015