CY2309CZXC-1T

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2309CZXC-1T is a low-cost, 3.3V zero-delay buffer designed for high-speed clock distribution. It accepts one reference input and drives nine low-skew outputs grouped as 4 + 4 + 1. The device features an on-chip phase-locked loop (PLL) that locks to the REF pin, with internal feedback obtained from the CLKOUT pad. Operating frequencies range from 10 MHz to 133 MHz. It supports Pentium-based systems and includes a test mode to bypass the PLL. The part is housed in a 16-pin TSSOP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero input-output propagation delay achieved through uniform loading of all outputs including CLKOUT.
• On-chip PLL provides cycle-to-cycle jitter of 60 ps typical at high drive.
• Multiple low-skew outputs with 85 ps typical output-to-output skew.
• Test Mode allows direct application of the input clock to outputs by setting Select inputs S1 and S2.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Distribution of high-speed clocks in Pentium-based systems.
• PCI bus frequency buffering.
• SDRAM buffer applications.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity and datasheet revision status prior to integration. Confirm lead-free compliance and moisture sensitivity level handling requirements during assembly. Ensure design accounts for the specific 16-pin TSSOP footprint dimensions provided in the package drawing section.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model for designs requiring nine buffered outputs from a single reference clock. Ensure all outputs, including the CLKOUT feedback pin, are loaded equally to maintain zero input-output delay. Verify that the operating temperature range meets system requirements, as commercial variants operate from 0°C to 70°C.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the CY2309 family of zero-delay buffers. It serves as the 16-pin version within the series, contrasting with the CY2305 which offers five outputs in an 8-pin package. The -1 suffix denotes the standard drive strength variant, distinct from the -1H high-drive versions.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

CY2309SXC-1T

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is zero input-output delay maintained?

All outputs must be uniformly loaded. Even if the CLKOUT pin is not used externally, it requires a capacitive load equal to that on other outputs to achieve zero input-output delay.

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

These inputs control the output state and source. Setting both S1 and S2 to logic high enables Test Mode, applying the input clock directly to the outputs while shutting down the PLL.

How does the device handle power consumption when no clock is present?

When there are no rising edges on the REF input, the PLL enters a power-down mode. The outputs become three-stated, resulting in a supply current draw of less than 25.0 μA.