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| www..com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PRODUCT FEATURES Generates CPU clock signals for microprocessor systems Reduces measured EMI by 10 dB nominal 4V to 6V operating supply range Supports CPUs from all major manufacturers. Wide range of selectable output frequencies including 60, 50, 48, 40, 33.3, 16.7 Single, low-cost frequency crystal used as reference 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. Glitch-free switching 50% duty cycle TTL or CMOS compatible outputs with 6 mA drive capability Low, short and long-term jitter 16 pin P-DIP and 16 Pin SOIC (300 mil body) package options CONNECTION DIAGRAM VDD OSCin OSCout VSS MPSEL AVDD S0 S1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 S3 VDD MPCLK VSS PRCLK AVSS LF1 SSON BLOCK DIAGRAM 3 44.2 MHz 2 REF /4 OR /12 14 MPCLK MPSEL 5 10 7 8 16 9 SPECTRUM SPREAD CLOCK GEN LF S0 S1 S3 SSON /2 12 PRCLK 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 www..com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PIN DESCRIPTION OSCin, OSCout - These pins form an on-chip reference oscillator when connected to terminals of an external 44.2 MHz third overtone parallel resonant crystal. OSCin may also serve as an input for an externally generated CMOS level or AC coupled reference signal. S0, S1, and S3 - Frequency select inputs. These inputs control the PRCLK frequency selection. S0, S1, and S3 inputs control the CPU clock frequencies. All these inputs have internal pull-downs. Table 1 shows conditions. the output frequency selection PRCLK - Output from the spectrum spread clock generator. Frequency selection is shown on Table 1. When the SSON pin is high, outputs are not modulated. When SSON is low, spectrum spread function is enabled. VSS - Circuit ground. VDD - Positive power supply. AVSS - Analog circuit ground. AVDD - Analog positive power supply. MPSEL - Controls MPCLK output frequency selections. Table 2 shows the selected frequencies for MPCLK. This input has an internal pull-up. SSON - This pin controls the spectrum spread function. When low, PRCLK is modulated. When high, spreading is turned off. This pin has an internal pull-up. LF1 - This is the control output for the clock generator. It is a single-ended, tri-state output. Component connections are shown in Figure 1A when SSON is low and in Figure 1B when SSON is high MPCLK - This is a non modulated output. This output can be programmed to be 3.7 MHz or 11.06 MHz. The selection of these frequencies are controlled by the MPSEL pin shown in Table 2. MPCLK FREQUENCY SELECTION INPUTS OUTPUT MPSEL S1 S0 MPCLK 0 1 X X X X TABLE 2 LF 3.7 MHz 11.06 MHz 2k 2200 pf R2 C2 330 pf C1 FIGURE 1A PCLK FREQUENCY SELECTION INPUTS OUTPUT S3 S1 S0 MPCLK 0 0 0 0 1 1 1 1 0 0 1 1 0 1 1 0 1 0 1 0 1 0 1 TABLE 1 N/A 16.7 MHz 33.3 MHz 40.0 MHz 48 MHz 50 MHz 50 MHz 60 MHz LF 22 22 ufd FIGURE 1B INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 2 of 7 www..com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR MAXIMUM RATINGS This device contains circuitry to protect the inputs against damage due to high static voltages or electric field; however, precautions should be taken to avoid application of any voltage higher than the maximum rated voltages to this circuit. For proper operation, Vin and Vout should be constrained to the range: VSS<(Vin or Vout)< VDD Unused inputs must always be tied to an appropriate logic voltage level (either VSS or VDD). Voltage Relative to VSS Voltage Relative to VDD Storage Temperature: Ambient Temperature: Maximum supply voltage: -0.3 0.3V -65 to +150C -0C to + 70C 7.0V ELECTRICAL CHARACTERISTICS Characteristic Input Low Voltage Input High Voltage Symbol VIL VIH Min 2.0 Typ - Max 0.8 - Units Vdc Vdc Input Low Current with Pull-up/ Pull-down Output Low Voltage IOL = 6mA Output High Voltage IOH=6mA Tri-State Leakage Current Static Supply Current Dynamic Supply Current Short Circuit Current IIH/IIL VOL VOH IOZ IDD ICC ISC 2.5 25 25 - 10/100 0.4 10 250 30 - A Vdc Vdc A A mA mA VDD = 5V + 10%, TA = 0C to +70C INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 3 of 7 www..com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR SWITCHING CHARACTERISTICS Characteristic Output Rise and Fall Time Measured at 10% - 90% of VDD Output Rise and Fall Time Measured at 0.8V - 2.0V Output Duty Cycles Peak-to-Peak Jitter One Sigma Symbol tTLH, tTHL Min Typ Max 5 Units ns tTLH, tTHL - - 3 ns TsymF1 Tj1s - - 45/55 2 % % of Fout VDD = 5V + 10%, TA = 0C to 70C, CL = 15 pF OSCILLATOR CHARACTERISTICS Characteristic Transconductance Output Impedance Input Capacitance Output Capacitance DC Bias Voltage Start-up Time Duty Cycle Input Rise Time OSCin Input Fall Time OSCout Symbol gm Zo Ci Co VB Ts TsymF1 ICLKr ICLKf Min 20 8 3 1.5 Typ 80 200 13 6 VDD/2 Max 180 800 18 9 3.5 2 45/55 20 20 Units millimho s ohms pf pf Volt ms % ns ns Conditions @ 44.2 MHz @ 44.2 MHz @ VDD = 4.5V - VCO CHARACTERISTICS Characteristic VCO Gain Phase Detector Gain Symbol Ko Kd Min 35 100 Typ 55 145 Max 65 200 Units MHz/volt A Conditions F/V Measured with VCO Control at 2V - 3V INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 4 of 7 www..com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR EXTERNAL CONNECTIONS VCC DIGITAL GND PLANE DVDD C11 10uF ANALOG GND PLANE AVDD R1 C10 10 Ohms 22uF L1 1.5 uH DVDD C3 10pF XTAL 44.2 MHz C5 SG509 C6 .1uF 1 2 3 4 5 6 7 8 VDD XIN XOUT VSS MPSEL AVDD S0 S1 S3 VDD MPCLK VSS PRCLK AVSS LF1 SSON 16 15 14 13 12 11 10 9 C9 .1uF DVDD JP5 1 2 HEADER C8 .1uF AVDD MPSEL JP1 S0 JP2 S1 JP3 S3 JP4 DVDD C2 2200pF C1 330 pf C4 10pF .033uF L2 1.2uH C7 10pF 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 www..com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PACKAGE DRAWING AND DIMENSIONS 16 PIN SOIC OUTLINE DIMENSIONS INCHES C L E H SYMBOL A A1 A2 B C D D A2 A1 B e A E a MILLIMETERS MAX 0.104 0.0015 0.111 0.019 0.0125 .412 0.299 MIN 0.097 0.0020 0.090 0.014 0.0091 .399 0.285 NOM 0.101 0.009 0.092 0.016 0.010 .407 0.296 0.050 BSC MIN 2.46 0.060 2.29 0.35 0.23 10.13 7.24 NOM 2.56 0.22 2.34 0.41 0.25 10.34 7.52 1.27 BSC MAX 2.64 0.38 2.39 0.48 0.32 10.46 7.59 e H a L 0.400 0 0.024 0.406 5 0.032 0.410 10 0.040 10.16 0 0.61 10.31 5 0.81 10.41 10 1.02 SOIC package (300 mil) 16-PIN PLASTIC DIP DIMENSIONS INCHES MILLIMETERS MAX 0.170 0.020 0.062 0.052 0.012 0.752 0.325 0.260 0.355 C E2 SYMBOL A A1 B B1 B2 MIN 0.150 0.015 0.016 0.056 0.046 0.008 0.748 0.300 0.240 0.335 NOM 0.160 0.018 0.059 0.049 0.010 0.750 0.312 0.252 0.345 0.100 BSC MIN 3.81 0.381 0.40 1.47 1.17 0.20 19.00 7.62 6.096 8.51 NOM 4.06 0.45 1.52 1.24 0.25 19.05 7.924 6.49 8.76 2.54 BSC MAX 4.318 0.50 1.57 1.32 0.30 19.10 8.255 6.604 9.01 a E E1 C D E D Q2 Q B2 A1 E1 E2 A e1 L a B1 L Q1 Q2 S 0.25 0 0.059 0.128 0.073 0.230 7 0.060 0.130 0.075 0.135 15 0.061 0.132 0.077 3.175 0 1.50 3.25 1.85 3.30 7 1.53 3.30 1.90 3.429 15 1.55 3.35 1.95 S e1 B INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 6 of 7 www..com IMISG509 April 1996 REDUCED EMI CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR ORDERING INFORMATION Part Number IMISG509xPB IMISG509xXB Note: Package Type 16 Pin Plastic Dip 16 Pin SOIC Production Flow Commercial, 0C to + 70C Commercial, 0C to + 70C The "x" following the IMI Device Number denotes the device revision. The ordering part number is formed by a combination of device number, device revision, package style, and screening as shown below. IMI SG509xPB Date Code, Lot # Marking: Example: IMISG509xPB Flow B = Commercial, oC to + 70C Package P = Plastic Dip X = Small Outline Revision IMI Device Number INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 7 of 7 |
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