IMIFS791

92/94 www.DataSheet4U.com FS791/92/94 Low EMI Spectrum Spread Clock Features Spread Spectrum Clock Generator (SSCG) with 1x, 2x and 4x outputs 80- to 140-MHz operating frequency range Modulates external clocks including crystals, crystal oscillators, and ceramic resonators Programmable modulation with simple R-C external loop filter (LF) Center spread modulation 3–5 Volt power supply TTL/CMOS compatible outputs Low short-term jitter Low Power Dissipation; — 3.3 VDC = 73 mW—typical — 5.0 VDC = 225 mW—typical Available in 8-pin SOIC package . Applications Desktop/Notebook computers VGA, XGA, and SXGA LCD displays High-speed printers and copiers CD-ROM, VCD, and DVD Embedded systems Networking, LAN/WAN Modems Benefits Programmable EMI reduction Fast time-to-market Lower cost of compliance No degradation in Rise/Fall time Lower component and PCB layer count Block Diagram Loop Filter Pin Configuration 4 Xin 1 10 pF. Reference Divider Xin Phase Detector 10 pF. 1 2 3 4 8 FS79x 7 6 5 VDD S0 FSOUT VSS VCO Xout S1 LF Xout 2 10 pF. Modulation Control VCO / N VDD 8 Power Contol Logic Input Control Counter and Mux FSOUT 6 5 3 7 VSS S1 S0 www.DataSheet4U.com Cypress Semiconductor Corporation Document #: 38-07343 Rev *A 3901 North First Street San Jose CA 95134 408-943-2600 Revised December 28, 2002 www.DataSheet4U.com FS791/92/94 . Pin Description Pin 1,2 Name Xin/Xout I/O I/O Type analog Description ...