CY22381SI-146

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY22381SI-146 is a FLASH programmable clock generator manufactured by Cypress Semiconductor Corp. It operates on a single 3.3 V power supply and features three integrated phase-locked loops (PLLs) to drive up to three configurable output clocks. The device accepts an external reference input, typically an 8–30 MHz crystal or a 1–166 MHz clock signal, which is processed through ultra-wide divide counters including eight-bit Q, eleven-bit P, and seven-bit post-divide stages. Designed for low-jitter performance, it supports field programmability and includes power-management options such as shutdown and output enable functions.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Three integrated PLLs driving three programmable CMOS outputs
• FLASH programmability with support for CyClocks RT configuration tools
• Ultra-wide divide counters: 8-bit Q, 11-bit P, and 7-bit post-divide
• Low-jitter, high-accuracy clock generation with configurable crystal drive strength

Clock Generators, PLLs, Frequency Synthesizers Applications

• Networking equipment clock distribution
• Telecommunication system timing
• Datacom interface synchronization

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix '146' against official Cypress documentation to confirm the exact output frequency configuration, as this code typically defines the factory-programmed frequency values. Confirm RoHS compliance status, as earlier revisions of the CY22381 family may not meet current environmental standards. Check for end-of-life status and lead finish variations (standard vs. NiPdAu) when sourcing replacements.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the CY22381SI-146 when a general-purpose, FLASH-programmable clock solution is required for networking or telecom applications. Ensure the design accommodates the 8-pin SOIC package dimensions. Verify that the required output frequencies fall within the supported range derived from the 1–166 MHz reference input and the available divider ratios. Consider the operating temperature range of 0°C to 70°C for commercial applications.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY22381 series represents a next-generation universal programmable clock generator designed to replace fixed-frequency oscillators in complex digital systems. The SI variant denotes the industrial or standard temperature grade packaging. This component belongs to a family that includes variants like the CY22381FC and CY22381SC, distinguished primarily by their programming methods, lead finishes, and specific frequency configurations.