SG536 Low EMI Clock Generator for Multi-Function Products Approved Product CONNECTION DIAGRAM PRODUCT FEATURES Supports clocking requirements for Multi- VDD XIN XOUT Function Products supporting Printers, Copiers, Scanners, Fax/modem integration. Programmable CPU clock output. Operates from 3.3V or 5V supply 60 mA buffer switching current 16 Pin SOIC for minimum board space Integrates a Spectrum Spread VSS CPUsel1 CPUsel0 VSS VDD technology for EMI attenuation of up to 15dB at harmonic frequencies. The IMISG536 is a clock generator that integrates clocking requirements for Multi-Function Products or stand alone products such as Printers, Copiers, and Scanners. In addition, it integrates a Spectrum Spread technology , a modulation technique designed specifically for reducing EMI at the fundamental frequency and at its harmonics. The EMI attenuation is proportional to the frequency, therefore achieving greater reduction at the harmonics where it is more difficult to pass federal regulations for radiated emissions (such as FCC, CSPIR, etc.). The IMISG536 operates from a 20 MHz crystal oscillator across pins 2 and 3, or from an external clock source. The REF output is a buffered output of the input signal at XIN. CPUclk is the modulated output for EMI attenuation. This clock has optional frequency outputs which can be selected with CPUsel(0:1). VIDclk (60 MHz) and SCNclk(40 MHz) are highly accurate fixed frequencies and therefore are not modulated. This device is packaged in a 16 pin SOIC package for minimum occupation of board space. 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 REF CPUclk VSS VDD SCNclk VIDclk VSS MODsel CPUclk SELECTION TABLE CPUsel1 CPUsel0 CPUclk (MHz) 0 0 16 0 1 33 1 0 25 1 1 50 BLOCK DIAGRAM XIN 20 MHz REF B REF PLL1 SSCG Control B CPUclk PLL2 B VIDclk B SCNclk XOUT CPUsel1 CPUsel0 MODsel INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.1 6/26/97 Page 1 of 6 SG536 Low EMI Clock Generator for Multi-Function Products Approved Product PIN DESCRIPTION OSCin, OSCout - These pins form an on-chip reference oscillator when connected to terminals of an external parallel resonant crystal. OSCin may also serve as an input for an externally generated CMOS level or AC coupled reference signal. CPUsel(0:1) - Input controls pins used to select the clock frequency of the CPUclk output. See table page 1. These pins have internal pull-ups. MODsel - This pin is used to control the Spectrum Spread enable/disable. When Low, Spectrum Spread is not applied to the CPUclk output. When High (default), this pin enables the CPUclk to be modulated at +/-1.25 % of its center frequency as described in figure 2, Page 4 and reduces EMI as described in figure 1. It has an internal pull-up. CPUclk - SSCG modulated clock output for system CPU. Frequency may be selected based on the table on page 1. SCNclk - Non-modulated clock output for system scanner processing. It is centered exactly at 40.00000 MHz. VIDclk - Non-modulated clock output for system engine logic. It is centered exactly at 60.00000 MHz. VDD - Circuit positive power supply. VSS - Circuit ground. A bypass capacitor (0.1µF) should be placed as close as possible to each VDD pin. If these bypass capacitors are not close to the pins their high frequency filtering characteristic will be canceled by the lead inductances of the traces. MAXIMUM RATINGS This device contains circuitry to protect the inputs Voltage Relative to VSS: -0.3V against damage due to high static voltages or electric field; however, precautions should be taken to avoid Voltage Relative to VDD: Storage Temperature: 0.3V -65ºC to + 150ºC application of any voltage higher than the maximum rated voltages to this circuit. For proper operation, Vin Ambient Temperature: Maximum Power Supply: -55ºC to +125ºC 7V 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). INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.1 6/26/97 Page 2 of 6 SG536 Low EMI Clock Generator for Multi-Function Products Approved Product ELECTRICAL CHARACTERISTICS Characteristic Input Low Voltage Input High Voltage Input Low, or High Current with Pull- up or Pull-down Output Low Voltage IOL = 12mA Output High Voltage IOH = 12mA Dynamic Supply Current Static Supply Current Short Circuit Current Symbol Min Typ Max Units Conditions VIL VIH IIL, IIH 2.0 - - 0.8 66 Vdc Vdc µA CPUsel (0:1), MODsel CPUsel (0:1), MODsel CPUsel (0:1), MODsel VOL - - 0.4 Vdc All Outputs VOH 2.4 - - Vdc All Outputs Icc Icc (PD) ISC 25 200 - 40 - mA µA mA CPUclk = 50 MHz 1 output at a time - 30 seconds VDD = 5 V, TA = 0ºC to +70ºC SWITCHING CHARACTERISTICS Characteristic Output Rise (0.4V - 2.0V) and Fall (2.0V-0.4V) time Output Duty Cycle ∆Period Adjacent Cycles CPU Jitter Absolute CPU Switching Current Low* Switching Current High* Symbol Min Typ Max Units Conditions 2 ns 15 pf Load tTLH, tTHL - - - 45 50 55 ∆P - - +250 % ps Measured at 1.5V - tjab - 500 ps MODsel = 0 IOL(AC) IOH(AC) - - mA mA VOL = 1.5V VOL = 1.5V 60 60 VDD = 5 V, TA = 0ºC to +70ºC INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.1 6/26/97 Page 3 of 6 SG536 Low EMI Clock Generator for Multi-Function Products Approved Product SPECTRUM SPREAD Amplitude (dB) Without Spectrum Spread With Spectrum Spread Spectrum Analysis Center Frequency(MHz) Modulation Domain Analysis Modulation Profile Modulated Fout freq. (MHz) Time Note : The modulation rate, fr, is dependent on the Input frequency (Xin). INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.1 6/26/97 Page 4 of 6 SG536 Low EMI Clock Generator for Multi-Function Products Approved Product PCB LAYOUT SUGGESTION Via to Ground Plane IMISG536 1 C3 2 16 15 3 14 4 13 5 12 6 11 7 10 8 9 C5 C4 C8 22µf FB1 Via to VCC Note: Bypass capacitors C3, C4, and C5, (0.1µf) should be placed as close as possible to each VDD pin. If these bypass capacitors are not close to the pins their high frequency filtering characteristic will be canceled by the lead inductances of the traces. NOTES 1. POWER SUPPLY BYPASS CAPS (O.1UF) MUST BE POSITIONED CLOSE TO VDD PINS TO BE EFFECTIVE. 2. C3, C4, C5, C and C8 CAPS MUST BE LOW LEAKAGE SUCH AS MULTILAYER CERAMIC Z5U OR X7R MATERIAL. INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.1 6/26/97 Page 5 of 6 SG536 Low EMI Clock Generator for Multi-Function Products Approved Product PACKAGE DRAWING AND DIMENSIONS 16 PIN SOIC OUTLINE DIMENSIONS INCHES C SYMBOL L H E D MAX MIN NOM MAX A 0.097 0.101 0.104 2.46 2.56 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 e 2.64 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 e A A1 B MILLIMETERS NOM A1 a A2 MIN 0.050 BSC 1.27 BSC H 0.400 0.406 0.40 10.16 10.31 a 0° 5° 10° 0° 5° 10.41 10° L 0.24 0.032 0.040 0.61 0.81 1.02 ORDERING INFORMATION Part Number Package Type IMISG536AXB 16 PIN SOIC Production Flow Commercial, 0ºC to + 70ºC Marking: Example: IMI SM536AXB Date Code, Lot# IMISM536AXB Flow B = Commercial, 0°C to + 70°C Package X = SOIC Revisions IMI Device Number INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.1 6/26/97 Page 6 of 6