4 Replies Latest reply on Oct 19, 2012 2:08 AM by content.librarian

    Advantages of Programmable PLL based device over pin programmable PLL based devices


      In a ‘customized’ PLL, the Q, P, and the Post-Divider are mask-programmed in a ROM. They have Fixed values and fixed frequencies.


      The Drawbacks of non-programmable PLL based devices are:


      1.       Design (i.e. frequency) changes can be costly and time-consuming.


      2.       Long lead times for new custom solutions.


      3.       Searching for a new fixed-function part.


      With Cypress programmable clock chips, the Q, P, and the Post-Divider are programmable in EPROM or EEPROM. Design changes are fast, easy and flexible. Programming a new set of P, Q, and Post-Divider values allows for design changes throughout project development.


      To summarize, Cypress has Programmable synthesizers, EMI Reducing clock generators, VCXO based devices and programmable crystal oscillators that have following key advantages:


                Programmable technology allows fast prototype builds


                Generates a wide range of frequencies using low cost crystals (Xtals)


                Multi-PLL devices integrates multiple Xtals/ XOs reducing cost


                VCXO option for tuning frequency


                Spread Spectrum option for reducing EMI at its source


                Low Jitter for maximizing system reliability


                Specialty Clocks for applications in Handsets, PCI, XDR Rambus


                Low Power for portable applications