CY2305SXI-1

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2305SXI-1 is an industrial temperature range, low-cost 3.3 V zero delay buffer manufactured by Infineon Technologies (formerly Cypress Semiconductor). It accepts one reference input and drives five low-skew clock outputs using an on-chip Phase Locked Loop (PLL) with internal feedback from the CLKOUT pin. The device operates within a frequency range of 10 MHz to 133.33 MHz and supports LVCMOS/LVTTL inputs. It features a power-down mode that reduces supply current to less than 25.0 μA when no rising edges are present on the REF input. The component is housed in an 8-pin SOIC package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero input-output propagation delay achieved through on-chip PLL feedback
• Typical output-to-output skew of 85 ps with uniformly loaded outputs
• Power-down mode draws less than 25.0 μA when REF input is inactive
• Industrial temperature operation from -40°C to +85°C

Clock Generators, PLLs, Frequency Synthesizers Applications

• Distribution of high-speed clocks for CPU and PCI bus frequencies
• Pentium-based system clock distribution
• Board-level testing via test mode bypassing the PLL

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature rating. The 'I' suffix indicates the industrial temperature range (-40°C to +85°C), while 'C' denotes commercial range. Ensure the lead-free status matches project requirements, as the datasheet lists Pb-free options under the 'SX' designation. Confirm availability status directly with Infineon or authorized distributors, as product lifecycles may change.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the CY2305SXI-1 for applications requiring five buffered outputs from a single reference clock with minimal skew. Ensure all outputs, including the CLKOUT feedback pin, have equal capacitive loading to maintain zero input-output delay. For higher drive strength and faster rise/fall times, consider the -1H variant. Verify that the load capacitance does not exceed 30 pF for frequencies below 100 MHz or 10 pF for frequencies between 100 MHz and 133.33 MHz.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY2305SXI-1 belongs to the CY2305/CY2309 family of low-cost 3.3 V zero delay buffers. The CY2305 is the 8-pin version providing five outputs, whereas the CY2309 is a 16-pin version offering nine outputs. Both devices share similar functional characteristics, including on-chip PLLs and low-skew output capabilities. The CY2305 series is designed for distributing high-speed clocks in systems compatible with CPU and PCI bus frequencies.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The CY2305SC-1 serves as the commercial temperature equivalent. The CY2305SXI-1H provides higher drive strength with faster rise and fall times compared to the standard -1 version. For applications requiring more outputs, the CY2309SXI-1 offers a 16-pin alternative with nine outputs.