CY2309ZXC-1H

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2309ZXC-1H is a low-cost, 3.3 V zero delay buffer clock distribution device manufactured by Infineon Technologies (formerly Cypress). It features an on-chip phase-locked loop that locks to a reference input on the REF pin, providing nine buffered outputs grouped into two banks of four and one dedicated output. The -1H suffix indicates a high-drive version with faster rise and fall times compared to standard drive variants. It operates within a frequency range of 10 MHz to 133.33 MHz and supports commercial temperature ranges from 0°C to +70°C. The device is housed in a 16-pin TSSOP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero input-to-output propagation delay achieved through internal PLL feedback
• High-drive capability for improved signal integrity at higher frequencies
• Configurable output banks allowing selective driving or three-stating
• Test mode bypassing the PLL for direct reference input routing

Clock Generators, PLLs, Frequency Synthesizers Applications

• Distribution of CPU and PCI bus clock frequencies
• Clock buffering in Pentium-based system architectures
• Multi-device clock synchronization requiring low skew

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature rating. The 'Z' suffix denotes the 16-pin TSSOP package, while 'C' indicates commercial temperature range. Ensure compatibility with existing PCB footprints for the TSSOP-16 form factor during procurement planning.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a zero delay buffer with nine outputs is required for 3.3 V systems. The -1H variant is necessary for applications demanding higher drive strength and faster edge rates. Verify that the load capacitance requirements align with the specified limits for the target operating frequency to maintain jitter specifications.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the CY2305/CY2309 family of low-cost zero delay buffers. The CY2309 provides nine outputs, whereas the CY2305 offers five. Both families share similar electrical characteristics and functional descriptions, differing primarily in output count and package options.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other CY2309 variants such as CY2309SXC-1H for SOIC packaging. Cross-family alternatives may require verification of pinout compatibility and drive strength differences.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is zero delay between input and output achieved?

Zero delay is achieved by ensuring all outputs, including the CLKOUT feedback pin, are uniformly loaded. The relative loading on the CLKOUT pin adjusts the input-output delay via the internal PLL.

What is the function of the S1 and S2 select inputs?

The S1 and S2 inputs control the output state. They can enable both output banks, disable Bank B, or bypass the PLL to route the reference input directly to the outputs for testing purposes.

Does the device enter power-down mode automatically?

Yes, the PLL enters a power-down mode when no rising edges are detected on the REF input. In this state, outputs are three-stated, and current draw drops below 25.0 μA.