CY23S05SXC-1

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY23S05SXC-1 is a low-cost, 3.3 V spread-aware zero delay buffer manufactured by Cypress Semiconductor. It accepts one reference input and drives five low-skew outputs using an on-chip phase-locked loop (PLL). The device operates within a frequency range of 10 MHz to 100 MHz and supports up to 133.33 MHz. Key electrical parameters include an output-to-output skew of less than 250 ps, a cycle-to-cycle jitter of under 200 ps, and an input-to-output propagation delay of 0 ± 350 ps. It utilizes advanced 0.65 µm CMOS technology and is housed in an 8-pin, 150-mil SOIC package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero input-output propagation delay achieved through uniform capacitive loading on all outputs, including the CLKOUT feedback pin.
• Spread Aware functionality that passes Spread Spectrum Frequency Timing Generation (SSFTG) signals without filtering.
• Low skew performance with guaranteed output-to-output skew less than 250 ps and device-to-device skew less than 700 ps.
• Power-down mode reduces supply current to less than 12.0 µA when no rising edges are detected on the REF input.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Distribution of high-speed clocks compatible with CPU and PCI bus frequencies.
• Systems requiring synchronization where Spread Spectrum EMI reduction techniques are employed.
• Multi-device clock distribution networks requiring tight inter-device skew specifications.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix for package type and temperature range. The 'C' suffix indicates Commercial temperature (0°C to 70°C), while 'I' denotes Industrial (-40°C to 85°C). The 'X' indicates a lead-free SOIC package. Confirm whether standard drive ('1') or high drive ('1H') is required, as rise/fall times differ significantly between these variants. Check for tape and reel availability if automated assembly is needed.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the CY23S05SXC-1 for applications requiring exactly five buffered clock outputs from a single reference source. Ensure all outputs, including CLKOUT, are loaded equally to achieve zero input-output delay; use the datasheet graph to calculate loading differences if delay adjustment is necessary. For frequencies above 100 MHz, limit load capacitance to 10 pF, whereas 30 pF is permissible below 100 MHz. Choose the -1H variant if faster rise and fall times are critical for signal integrity.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY23S05SXC-1 is the 5-output version of the CY23S09 series. While the CY23S09 provides nine outputs grouped into two banks of four plus one, the CY23S05 simplifies the design for lower fan-out requirements. Both devices share identical PLL architecture, operating voltages, and package options, allowing for design flexibility based on output count needs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include the CY23S09SXC-1 for higher output counts. For legacy leaded packages, the CY23S05SC-1 was the equivalent part before the transition to lead-free SX suffixes. Verify that any substitute maintains the 3.3 V supply requirement and 0.65 µm CMOS process characteristics to ensure compatibility with existing PCB layouts and power supplies.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is zero input-output propagation delay achieved?

Zero delay is obtained by ensuring all outputs, including the CLKOUT pin used for internal PLL feedback, have equal capacitive loads. Adjusting the load difference between CLKOUT and other outputs allows for precise delay tuning.

What is the maximum load capacitance allowed?

The maximum load capacitance is 30 pF for operating frequencies below 100 MHz. For frequencies ranging from 100 MHz to 133.33 MHz, the load capacitance must be limited to 10 pF.

Does the device support Spread Spectrum Frequency Timing Generation?

Yes, the CY23S05SXC-1 is Spread Aware and does not filter out Spread Spectrum features from the reference input, preventing tracking skew issues in synchronized systems.