CY2309ZXC-1HT

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2309ZXC-1H is a low-cost, 3.3 V zero delay buffer designed for distributing high-speed clocks in Pentium-based systems. It accepts one reference input and drives nine buffered clock outputs grouped as four plus four plus one. The device features an on-chip phase-locked loop (PLL) that locks to the input clock on the REF pin, ensuring zero input-to-output propagation delay when outputs are uniformly loaded. It operates within a frequency range of 10 MHz to 133.33 MHz with a supply voltage between 3.0 V and 3.6 V. The component is housed in a 16-pin TSSOP package and supports commercial temperature operation from 0°C to 70°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero input-output propagation delay achieved through internal PLL feedback
• Nine low-skew buffered clock outputs organized into two banks
• Test mode capability to bypass the phase-locked loop via select inputs
• Power-down mode reduces current consumption when no rising edges are detected on the reference input

Clock Generators, PLLs, Frequency Synthesizers Applications

• Distribution of CPU bus frequencies
• PCI bus clock distribution
• Pentium-based system clocking

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature range. The ZXC suffix indicates a lead-free 16-pin TSSOP package in the commercial temperature grade. Confirm RoHS compliance status and check for any discontinuance notifications or alternative part recommendations from the manufacturer before finalizing procurement plans.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a single reference clock must be distributed to multiple loads with minimal skew and zero delay relative to the source. Ensure the load capacitance requirements match the operating frequency, specifically limiting loading to 10 pF for frequencies above 100 MHz. Verify that the power-up sequence provides the reference clock before or simultaneously with the supply voltage to ensure proper initialization.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This device belongs to the CY2305/CY2309 family of low-cost zero delay buffers originally developed by Cypress Semiconductor. Following Infineon Technologies' acquisition of Cypress, these parts are maintained within the Infineon portfolio. The CY2309 variant specifically provides nine outputs compared to the five outputs found in the CY2305 counterpart.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The CY2309SXC-1H serves as a direct functional replacement offering identical specifications but utilizes a 16-pin SOIC package instead of the TSSOP form factor.