www.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PRODUCT FEATURES þ PRODUCT DESCRIPTION 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 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 crystal used as reference BLOCK DIAGRAM 3 44.2 MHz MPSEL LF S0 S1 S3 SSON 2 REF /4 OR /12 14 MPCLK /2 12 PRCLK 5 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 15 14 13 12 11 10 9 S3 VDD MPCLK VSS PRCLK AVSS LF1 SSON 10 7 8 16 SPECTRUM SPREAD CLOCK GEN 9 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.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 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 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. 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. MPCLK FREQUENCY SELECTION INPUTS OUTPUT MPSEL S1 S0 MPCLK 0 1 X X X X 3.7 MHz 11.06 MHz TABLE 2 LF 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 2k R2 2200 pf 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. 330 pf C1 C2 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 22Ω 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.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR MAXIMUM RATINGS Voltage Relative to VSS Voltage Relative to VDD Storage Temperature: Ambient Temperature: Maximum supply voltage: -0.3 0.3V -65° to +150°C -0°C to + 70°C 7.0V 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). ELECTRICAL CHARACTERISTICS Characteristic Symbol Min Typ Max Units Input Low Voltage VIL - - 0.8 Vdc Input High Voltage VIH 2.0 - - Vdc IIH/IIL - - 10/100 µA Input Low Current with Pull-up/ Pull-down Output Low Voltage IOL = 6mA VOL - - 0.4 Vdc Output High Voltage IOH=6mA VOH 2.5 - - Vdc Tri-State Leakage Current IOZ - - 10 µA Static Supply Current IDD - - 250 µA Dynamic Supply Current ICC - 25 30 mA Short Circuit Current ISC 25 - - mA VDD = 5V + 10%, TA = 0°C to +70°C INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 3 of 7 www.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR SWITCHING CHARACTERISTICS Characteristic Symbol Min Typ Max Units Output Rise and Fall Time Measured at 10% - 90% of VDD tTLH, tTHL - - 5 ns Output Rise and Fall Time Measured at 0.8V - 2.0V tTLH, tTHL - - 3 ns TsymF1 - - 45/55 % Tj1s - - 2 % of Fout Output Duty Cycles Peak-to-Peak Jitter One Sigma VDD = 5V + 10%, TA = 0°°C to 70°°C, CL = 15 pF OSCILLATOR CHARACTERISTICS Characteristic Symbol Min Typ Max Units Conditions Transconductance gm 20 80 180 millimho s @ 44.2 MHz Output Impedance Zo - 200 800 ohms @ 44.2 MHz Input Capacitance Ci 8 13 18 pf - Output Capacitance Co 3 6 9 pf - DC Bias Voltage VB 1.5 VDD/2 3.5 Volt - Start-up Time Ts - - 2 ms @ VDD = 4.5V Duty Cycle TsymF1 - - 45/55 % - Input Rise Time OSCin ICLKr - - 20 ns - Input Fall Time OSCout ICLKf - - 20 ns - VCO CHARACTERISTICS Characteristic Symbol Min Typ Max Units Conditions VCO Gain Ko 35 55 65 MHz/volt ∆F/∆V Measured with VCO Control at 2V - 3V Phase Detector Gain Kd 100 145 200 µA INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 4 of 7 www.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR EXTERNAL CONNECTIONS VCC DIGITAL GND PLANE L1 DVDD 1.5 uH C11 10uF ANALOG GND PLANE R1 AVDD C10 10 Ohms 22uF DVDD C3 10pF XTAL 44.2 MHz C5 C4 10pF SG509 C6 .1uF .033uF L2 1.2uH C7 10pF 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 DVDD C9 .1uF JP5 1 2 HEADER C8 .1uF AVDD MPSEL JP1 S0 JP2 C2 2200pF C1 330 pf 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 www.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PACKAGE DRAWING AND DIMENSIONS 16 PIN SOIC OUTLINE DIMENSIONS INCHES SYMBOL C L H E D a A2 A A1 MIN NOM MILLIMETERS MAX MIN NOM MAX 2.64 A 0.097 0.101 0.104 2.46 2.56 A1 0.0020 0.009 0.0015 0.060 0.22 0.38 A2 0.090 0.092 0.111 2.29 2.34 2.39 0.48 B 0.014 0.016 0.019 0.35 0.41 C 0.0091 0.010 0.0125 0.23 0.25 0.32 D .399 .407 .412 10.13 10.34 10.46 E 0.285 0.296 0.299 7.24 7.52 7.59 0.050 BSC e 1.27 BSC H 0.400 0.406 0.410 10.16 10.31 a 0° 5° 10° 0° 5° 10° L 0.024 0.032 0.040 0.61 0.81 1.02 e B 16-PIN PLASTIC DIP DIMENSIONS SOIC package (300 mil) INCHES C E2 a E E1 D B2 Q2 Q A1 B1 S 10.41 e1 B A L MILLIMETERS SYMBOL MIN NOM MAX MIN NOM MAX 0.160 0.170 3.81 4.06 4.318 A 0.150 A1 0.015 - - 0.381 - - B 0.016 0.018 0.020 0.40 0.45 0.50 B1 0.056 0.059 0.062 1.47 1.52 1.57 B2 0.046 0.049 0.052 1.17 1.24 1.32 C 0.008 0.010 0.012 0.20 0.25 0.30 D 0.748 0.750 0.752 19.00 19.05 19.10 E 0.300 0.312 0.325 7.62 7.924 8.255 E1 0.240 0.252 0.260 6.096 6.49 6.604 E2 0.335 0.345 0.355 8.51 8.76 9.01 0.100 BSC e1 2.54 BSC L 0.25 0.230 0.135 3.175 3.30 3.429 a 0° 7° 15° 0° 7° 15° Q1 0.059 0.060 0.061 1.50 1.53 1.55 Q2 0.128 0.130 0.132 3.25 3.30 3.35 S 0.073 0.075 0.077 1.85 1.90 1.95 INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 6 of 7 www.DataSheet4U.com IMISG509 REDUCED EMI CLOCK CHIP April 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR ORDERING INFORMATION Part Number Package Type IMISG509xPB 16 Pin Plastic Dip Commercial, 0°C to + 70°C IMISG509xXB 16 Pin SOIC Commercial, 0°C to + 70°C Note: Production Flow 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. Marking: Example: IMI SG509xPB Date Code, Lot # IMISG509xPB Flow B = Commercial, o°C to + 70°C 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