The MK2059-01 is a VCXO (Voltage Controlled Crystal Oscillator) based clock generator that produces common telecommunications reference frequencies. The output clock is phase locked to an 8kHz (frame rate) input reference clock. The MK2059-01 also provides jitter attenuation. Included in the selection of output frequencies are these common system clocks: 1.544 MHz (T1) 2.048 (E1) 19.44 MHz (OC-3) 16.384 MHz (8x E1) This monolithic IC, combined with an external inexpensive quartz crystal, can be used to replace a more costly hybrid VCXO retiming module. Through selection of external loop filter components, the PLL loop bandwidth and damping factor can be tailored to meet input clock jitter attenuation requirements. A loop bandwidth down to the Hz range is possible


  • Generates T1, E1, OC-3 and other common telecom clock frequencies from an 8kHz frame clock
  • Configurable jitter attenuation characteristics, excellent for use as a Stratum source de-jitter circuit
  • 2:1 Input MUX for input reference clocks
  • VCXO-based clock generation offers very low jitter and phase noise generation
  • Output clock is phase and frequency locked to the selected input reference clock
  • Fixed input to output phase relationship (except for 1.544 MHz and 2.048 MHz output selections)
  • +115ppm minimum crystal frequency pullability range, using recommended crystal
  • Industrial temperature range
  • Low power CMOS technology
  • 20 pin SOIC package
  • Single 3.3V power supply
  • Pb (lead) free package

Product Options

Orderable Part ID Part Status Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete 20 I Yes Tube
Obsolete 20 I Yes Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
MK2059-01 Datasheet Datasheet PDF 357 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-841 Pullable Crystal Selection and VCXO Tuning Application Note PDF 334 KB
AN-831 The Crystal Load curve Application Note PDF 395 KB
AN-848 VCXO - Crystal Selection Application Note PDF 222 KB
AN-849 Loop Filter Component Selection for VCXO Based PLLs Application Note PDF 218 KB
AN-847 VCXO - Absolute Pull Range Application Note PDF 155 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 115 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 143 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-800 Approved VCXO Crystals Application Note PDF 150 KB
AN-801 Crystal-High Drive Level Application Note PDF 202 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
Using IDT's Integrated VCXO Products MAN05 Application Note PDF 231 KB
PDN# : MM-15-05 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 531 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB
Clock Distribution Overview 日本語 Overview PDF 217 KB
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB