CY28405OXCT

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CY28405OXCT is a programmable, low power programmable clock generator which can replace multiple low end clock oscillator or IC clock generator. It has 154 selectable outputs, with multiple output frequencies from 156.25MHz to 250MHz. It is widely used in current timing and system clocking applications.

The application fields of CY28405OXCT mainly include but not limited to network switching and router, system timing, medical equipment, high-definition audio, and image, industrial control system, etc. There are various industrial grade packages for CY28405OXCT, such as 6-pad MLP, 8-pad MLP and 8-pad SIP. It can provide a wide operating range of temperature, and it has integrated EMI reduction, low noise and low power.

As the most common clock generator on the market, the working principle of CY28405OXCT is simple and reliable. In terms of its core circuitry, it contains an input PLL, a voltage-controlled oscillator, and several output PLLs that generate output clocks with higher frequency. It receives its clock input from a single reference frequency and distributes it to the internal oscillator and other output PLLs, which are then divided to get the appropriate output frequency. Its output configuration consists of an output setup register, an output mask register, and an output power register. Its power management is done through an external rail or through an internal regulator.

The input phase-lock loop (PLL) of CY28405OXCT uses an external source as a reference frequency, and a phase comparator for comparison. It then adjusts the voltage-controlled oscillator (VCO) frequency to ensure the input frequency is correct, and the output locks at the given reference frequency. This can be done to multiple PLLs, which allows multiple frequencies to be generated from the same reference frequency.

After the core internal PLL is locked, the output PLLs are enabled and the output frequencies are set according to the assigned clock frequencies. The output PLLs use a divide by N counter to calculate the output frequency. The N value is an adjustable register and can vary from 0 to 255 to generate any desired compatible frequency. The power management in CY28405OXCT also integrates with an external rail and internal voltage regulator, so it can provide an added power saving shield.

Finally, the masks register and output configuration of CY28405OXCT assign the specific output frequencies for each output. The mask register disables any output port not used for a given application. This ensure that the power is redistributed to the necessary functional ports, and that external components can be reduced and save design space. The output clock setup register allows each of the 154 outputs to be individually programmed to one of the higher frequency clocks. The output power register can power up, power down, or hold specific output ports.

In conclusion, CY28405OXCT is a versatile and reliable programmable clock generator for a wide range of industrial timing and system clocking applications. Its core consists of an input PLL, a voltage-controlled oscillator, and several output PLLs that generate the desired frequencies. Its power management features, mask register, and output configuration further simplify its integration and application. Thus, it is widely used in network switching and router, system timing, medical equipment, high-definition audio and image, industrial control system, and other applications.

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