PDF IMISG509 Data sheet ( Hoja de datos )

Número de pieza	IMISG509
Descripción	Reduced EMI Clock Chip
Fabricantes	International Microcircuits
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No Preview Available ! www.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 PRODUCT FEATURES þ Generates CPU clock signals for microprocessor systems þ Reduces measured EMI by 10 dB nominal þ 4V to 6V operating supply range þ Supports CPUs from all major manufacturers. þ Wide range of selectable output frequencies including 60, 50, 48, 40, 33.3, 16.7 þ Single, low-cost crystal used as reference frequency þ Glitch-free switching þ 50% duty cycle þ TTL or CMOS compatible outputs with 6 mA drive capability þ Low, short and long-term jitter þ 16 pin P-DIP and 16 Pin SOIC (300 mil body) package options BLOCK DIAGRAM 44.2 MHz 3 2 REF MPSEL 5 LF S0 S1 S3 SSON 10 7 8 16 9 SPECTRUM SPREAD CLOCK GEN /4 OR /12 14 MPCLK /2 12 PRCLK CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PRODUCT DESCRIPTION The IMISG509 is a spectrum spread clock generator specially designed for personal computers, laser printers and other digital systems. IMISG509 uses a patented concept to generate popular clock frequencies that are intentionally broadbanded to reduce electromagnetic interference. The radiated emissions, associated with either the clock, harmonics or any signals derived from the clock, nominally reduced by 10 dB and could significantly reduce the cost of complying with the regulatory requirements. PRCLK is the broadbanded output and can be programmed by the PRCLK Frequency Selection Table on Page 2. A single, low cost external crystal is required as reference frequency for the synthesizer. The output modulation function can be disabled when the SSON pin is high. CONNECTION DIAGRAM VDD OSCin OSCout VSS MPSEL AVDD S0 S1 1 2 3 4 5 6 7 8 16 S3 15 VDD 14 MPCLK 13 VSS 12 PRCLK 11 AVSS 10 LF1 9 SSON APPLICATIONS IMISG509 eliminates the need for multiple oscillators and generates the CPU clock signals for personal computers, laser printers and other digital systems. Supports CPUs from all major manufacturers. INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 1 of 7 1 page www.DataSheet4U.com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR EXTERNAL CONNECTIONS DIGITAL GND PLANE ANALOG GND PLANE C3 10pF C4 10pF XTAL 44.2 MHz C5 .033uF C6 .1uF L2 1.2uH C7 10pF DVDD DVDD AVDD VCC L1 C11 1.5 uH 10uF R1 C10 10 Ohms 22uF SG509 1 VDD 2 XIN 3 XOUT 4 VSS 5 MPSEL 6 AVDD 7 S0 8 S1 S3 VDD MPCLK VSS PRCLK AVSS LF1 SSON 16 15 14 13 12 11 10 9 MPSEL JP1 S0 JP2 C9 DVDD JP5 .1uF 1 2 HEADER C8 .1uF C2 2200pF C1 330 pf AVDD S1 JP3 S3 JP4 DVDD NOTE: KEEP C3, C4, C5, C6 CLOSE TO THEIR PINS (4, 11, 13, 10, 9 RESPECTIVELY). INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 5 of 7 5 Page

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Número de pieza	Descripción	Fabricantes
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