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SG522

INTERNATIONAL MICROCIRCUITS
Part Number SG522
Manufacturer INTERNATIONAL MICROCIRCUITS
Description Spread Spectrum Clock Generator
Published Oct 26, 2015
Detailed Description Approved Product Features • Generates Spread Spectrum Clock (SSC) • Programmable Frequencies from 10 to 120 MHz • 1.25% ...
Datasheet PDF File SG522 PDF File

SG522
SG522

Overview
Approved Product Features • Generates Spread Spectrum Clock (SSC) • Programmable Frequencies from 10 to 120 MHz • 1.
25% and 3.
25% Down-Spread Options • Separate Non-Modulated Clock • Pin-Programmable Spread on/off Function • 50% Output Clock Duty Cycle • Power-Down Mode for Low Power Dissipation • TTL or CMOS Compatible Outputs • Low Cycle-to-Cycle Jitter of 250 ps-max • External Clock or Crystal Oscillator Operation • Glitch-Free Switching • 3 to 5V Operation Supply Range • 16-Pin Plastic SOIC Package SG521/22/24/28 Spread Spectrum Clock Generator Applications • CPU and µC Based Digital Systems • Laser and Inkjet Printers • Digital Copiers • Multifunction Products (MFPs) • Disk Drives • CD-ROM • Automotive • Video and Imaging Applications Benefits • 12 to 20dB EMI Reduction • Fast Time to Market • Low System and Development Cost General Description IMI SG521/22/24/28 products are Spread Spectrum Clock Generators designed to reduce the high levels of Electromagnetic Interference (EMI) found in high-speed digital systems.
By using a modulated clock as the source for all system clocks and timing signals, the amount of radiated energy (EMI) throughout the system is greatly reduced.
Energy reduction is related to the harmonic frequency, such that the higher the frequency the greater the energy reduction.
The 5th harmonic has greater energy reduction than the fundamental frequency.
The SG521/2/4/8 products produce a wide range of clock frequencies from 10 to 120 MHz, which are frequency modulated (PRCLK) by using a Spread Spectrum Clock (SSC) technique to reduce electromagnetic interference (EMI).
In addition, a non-modulated clock output (MPCLK) with various standard clock frequencies is also provided for the part of the system that could be sensitive to a modulated clock.
Refer to the Product Selection and Frequency Selection Truth Tables for the available modulated and non-modulated clock frequencies.
The spread function can be turned on or off using the SSON contro...


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