The IDT663 is a low cost Phase-Locked Loop (PLL) designed for clock synthesis and synchronization. Included on the chip are the phase detector, charge pump, Voltage Controlled Oscillator (VCO) and an output buffer. Through the use of external reference and VCO dividers (implemented with the IDT674-01, for example), the user can easily configure the device to lock to a wide variety of input frequencies. The phase detector and VCO functions of the device can also be used independently. This enables the configuration of other PLL circuits. For example, the IDT663 phase detector can be used to control a VCXO circuit such as the MK3754. For applications requiring Power Down or Output Enable features, please refer to the IDT673-01.


  • Packaged in 8-pin SOIC (Pb free)
  • Output clock range 1 MHz to 100 MHz (3.3 V), 1 MHz to 120 MHz (5 V)
  • External PLL loop filter enables configuration for a wide range of input frequencies
  • Ability to accept an input clock in the kHz range (video HSYNCH, for example)
  • 25 mA output drive capability at TTL levels
  • Lower power CMOS process
  • +3.3 V ±5% or +5 V ±10% operating voltage
  • Used along with the IDT674-01, forms a complete PLL circuit
  • Phase detector and VCO blocks can be used
  • independently for other PLL configurationsIndustrial temperature version available
  • For better jitter performance, use the MK1575

Product Options

Orderable Part ID Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete SOIC 8 I Yes Tube
Obsolete SOIC 8 I Yes Reel
Obsolete SOIC 8 C Yes Tube
Obsolete SOIC 8 C Yes Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
663 Datasheet Datasheet PDF 277 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-831 The Crystal Load curve Application Note PDF 395 KB
AN-845 Termination - LVCMOS Application Note PDF 146 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 170 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 128 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-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-832 Timing Budget and Accuracy Application Note PDF 131 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-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
PDN# : U-13-05R2 PRODUCT DISCONTINUANCE NOTICE (REVISED) Product Discontinuation Notice PDF 161 KB
PCN# : A1309-01 Changed of Traceability Mark Format Product Change Notice PDF 439 KB
PCN# : A1305-01 Gold Wire to Copper Wire Product Change Notice PDF 148 KB
PDN# : U-13-05R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 161 KB
PDN# : U-13-05 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 159 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB