[International Microcircuits, Inc.]

PRODUCT DESCRIPTION
The IMI FS741 is a Frequency Spreading EMI Attenuator designed for the purpose of reducing Electro Magnetic Interference (EMI) found in today’s high speed digital systems. The FS741 uses a proprietary technique to modulate the output clock frequency, Modout. By modulating the frequency of the digital clock, measured EMI at the fundamental and harmonic frequencies is greatly reduced. This reduction in radiated energy can significantly reduce the cost of complying with regulatory requirements without degrading digital waveforms.

FEATURES
• Reduces Systemic EMI.
• Modulates external clocks including crystals,
   crystal oscillators and ceramic resonators.
• 3 - 5 Volt power supply.
• Modulation programmable with simple
   external loop filter (LF).
• 4 to 68 MHz operating frequency range.
• Digitally controlled modulation.
• TTL/CMOS compatible outputs.
• Center Spread Modulation.
• Low short term jitter.
• Bi-Directional buffers for reduced pin count.
• Unmodulated Reference Clock Output.
• Low Power Dissipation;
   3.3 VDC = 30 mw - typical
   5.0 VDC = 100 mw - typical
• Available in 8 pin SOIC package.

APPLICATIONS
• Desktop/Laptop Computer
• Modems
• Scanners, Printers, Copiers, Fax Machines, MFP’s
• Disk and CD-ROM Drives
• Automotive and Embedded Systems
• Networking, LAN/WAN
• Digital Cameras, Games
• LCD displays

BenefitS
• Reduction of radiated EMI
• Fast Time to Market
• Lower cost of compliance
• Programmable EMI reduction
• No degradation in Rise/Fall times
• Lower component and PCB layer count