CY2305ESXI-1

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2305ESXI-1 is a low-cost 3.3V zero delay buffer manufactured by Cypress Semiconductor Corp, designed for distributing high-speed clocks in PCI and SDRAM applications. It accepts one reference input and drives five low-skew outputs with an input-to-output ratio of 1:5. The device features an on-chip phase-locked loop (PLL) that locks to the input clock on the REF pin, ensuring zero input-output propagation delay. Operating frequencies range from 10 MHz up to 133 MHz, compatible with CPU and PCI bus standards. It utilizes LVCMOS/LVTTL inputs and LVCMOS outputs within a supply voltage range of 3V to 3.6V.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero Delay Buffer architecture providing zero input-output propagation delay
• On-chip PLL feedback obtained from the CLKOUT pad for precise clock distribution
• Low output-to-output skew of approximately 85 ps typical
• Supports operating frequencies up to 133 MHz with 10 MHz to 133 MHz range

Clock Generators, PLLs, Frequency Synthesizers Applications

• PCI bus clock buffering and distribution
• SDRAM controller clock generation
• Pentium-based system clock synchronization

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY2305 series serves as the 8-pin variant of the CY2309 family, which offers nine outputs in a 16-pin package. Both are engineered as cost-effective solutions for 3.3V systems requiring high-speed clock fanout. The -1 suffix typically denotes standard drive strength compared to the -1H variants which offer higher drive capabilities.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

For designs requiring higher drive strength or specific lead-free compliance variations, consider the CY2305SC-1T or CY2305CSXA-1H. Verify package compatibility (8-SOIC) and electrical specifications against the original design requirements before substitution.