CY2309ZXI-1HT

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2309ZXI-1HT is a low-cost, 3.3 V zero delay buffer manufactured by Infineon Technologies (formerly Cypress). It operates within an industrial temperature range of -40 °C to +85 °C and accepts a single reference input frequency between 10 MHz and 133 MHz. The device provides nine LVCMOS outputs with high drive capability, organized into two banks of four outputs plus one dedicated output. It features an on-chip PLL that locks to the REF pin, ensuring zero input-to-output propagation delay when outputs are uniformly loaded. The part is housed in a 16-pin TSSOP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero input-output propagation delay achieved through internal PLL feedback loop
• High drive capability for faster rise and fall times compared to standard versions
• Test mode functionality allows bypassing the PLL via select inputs
• Power-down mode reduces supply current significantly when no reference clock is present

Clock Generators, PLLs, Frequency Synthesizers Applications

• Distribution of high-speed clocks in Pentium-based systems
• PCI bus frequency synchronization
• CPU clock distribution networks
• System testing and validation using PLL bypass modes

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity through authorized Infineon distributors or certified partners. Confirm the specific ordering suffix matches the required package type and temperature grade. Check for recent Product Change Notifications (PCNs) regarding packaging or material changes. Ensure compliance with RoHS directives as specified in the datasheet. Validate lead-free status if required by assembly processes.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this variant for industrial temperature applications requiring high drive strength. The 'H' suffix denotes higher drive current suitable for heavier capacitive loads. Ensure the design maintains uniform loading across all outputs, including CLKOUT, to achieve specified zero delay performance. Verify that the reference input frequency falls within the 10 MHz to 133 MHz operational range for optimal jitter specifications.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the CY2305/CY2309 family of low-cost zero delay buffers. The CY2309 variant specifically offers nine outputs compared to the five outputs of the CY2305. It is designed as a cost-effective solution for clock distribution in legacy and modern digital systems requiring precise timing alignment without external components.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

CY2309ZXI-1H is the non-tape-and-reel equivalent in the same package and electrical specification. CY2309SXI-1HT serves as a functional substitute in the SOIC package format. Direct replacements must maintain the 3.3 V operation and industrial temperature rating.