CY2077FSXCT

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2077FSXCT is a high-accuracy, EPROM-programmable single-PLL clock generator manufactured by Infineon Technologies (formerly Cypress Semiconductor). It operates on a 3.3V or 5V supply and generates output frequencies ranging from 390 kHz to 133 MHz at 5V, or up to 100 MHz at 3.3V. The device features a 12-bit feedback multiplier and a 10-bit reference divider for precise frequency synthesis with zero PPM error. It supports reference inputs from 10–30 MHz crystals or 1–75 MHz external clocks. The component provides sixteen selectable post-divide options, low jitter outputs typically around 80 ps, and configurable TTL or CMOS duty cycles. It is housed in an 8-pin SOIC package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• High-accuracy PLL with 12-bit multiplier and 10-bit divider for zero PPM frequency synthesis
• EPROM programmability allowing custom frequency generation and configuration
• Low jitter outputs typically 80 ps with controlled rise and fall times
• Flexible power management with asynchronous or synchronous PWR_DWN/OE modes

Clock Generators, PLLs, Frequency Synthesizers Applications

• Modems
• Disk drives
• CD-ROM and DVD players
• Set-top boxes
• Data/telecommunications equipment

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix 'T' indicates tape and reel packaging when sourcing this component. Confirm that the device requires field programming using compatible tools such as the CY3670 programmer or third-party alternatives. Ensure the design utilizes the CyClocks software to generate the necessary JEDEC format programming file before deployment.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the CY2077FSXCT when a highly accurate, stable clock source with zero PPM error is required for system synchronization. This component is suitable for designs needing flexible output configurations and low jitter performance. Consider its EPROM programmability for custom frequency requirements without relying on fixed-frequency oscillators. Verify compatibility with standard PC, networking, and consumer application platforms.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY2077 series belongs to the CyberClocks family of programmable clock generators. Originally developed by Cypress Semiconductor, the product line was acquired by Infineon Technologies. The CY2077FSXCT represents the commercial temperature range variant packaged in tape and reel format. It serves as a cost-effective alternative to traditional crystal oscillators by allowing frequency synthesis via a low-cost reference crystal.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Factory programming is no longer offered for new designs using the CY2077. For high-volume applications requiring factory programming, consider replacement devices such as the CY22180, CY22801, or CY22381. Field-programmable variants like the CY2077FZZ or CY2077FZXI may be used if different packaging or industrial temperature ranges are needed.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is the output frequency determined for the CY2077?

The output frequency is determined by the EPROM-programmable 12-bit feedback counter value (P) and the 10-bit reference counter value (Q), calculated using the formula FPLL = FREF * (2P + 5) / (2Q + 5).

What is the difference between PWR_DWN and OE modes?

In PWR_DWN mode, all active circuits are powered down when the control pin is LOW, requiring the PLL to relock upon activation. In OE mode, the output is three-stated while the oscillator and PLL remain active, allowing for quicker clock output return.

Can the CY2077 accept an external clock reference?

Yes, the device accepts an external clock reference ranging from 1 to 75 MHz. When using an external clock, the XTALOUT pin should be left floating.