Spread-spectrum PLL clock generator for EMI-sensitive designs
The Cypress CY27020SC is a spread-spectrum clock generator with an integrated PLL, designed to reduce electromagnetic interference (EMI) in digital systems by modulating the output clock frequency over a controlled bandwidth. It accepts a crystal input and delivers up to two clock outputs at a maximum frequency of 48 MHz. The device operates from a 2.97 V to 3.63 V supply and is specified over the commercial temperature range of 0°C to 70°C. Packaged in an 8-pin SOIC, it is a surface-mount component suited for low-noise clock generation in consumer electronics, office equipment, and other indoor digital appliances where conducted or radiated EMI must be kept within regulatory limits.
The 48 MHz maximum output frequency covers common microcontroller, FPGA, and memory bus clock domains up to that speed. The 1:2 input-to-output ratio means a single crystal input drives two clock outputs — enough for a small clock tree without an external fanout buffer. The PLL is enabled, so the output is synthesized from the crystal reference; the divider/multiplier is listed as No/No, indicating the PLL operates in a fixed multiplication mode rather than a programmable divider chain. For designs requiring a spread-spectrum profile to pass FCC or CISPR Class B emissions, this part modulates the output frequency to spread the peak energy.
The part is RoHS non-compliant, so verify the lead-free exemption or alternative if your assembly process requires RoHS compliance.
Package and marking authenticity check
The device comes in an 8-pin SOIC package with a body width of 3.90 mm (0.154-inch) and a surface-mount footprint. The supplier device package is designated 8-SOIC. For counterfeit-detection purposes, the laser-etched top marking should be clean, consistent with Cypress's font and layout for this date-code range. The 8-SOIC package is common enough that re-marked or sanded parts from other 8-pin clock generators could be swapped in. Verify the date-code lot traceability back to an authorized Cypress distributor if the supply chain is suspect.