SIIWI x ORE ii * = IMISG504 January 1996 PRODUCT FEATURES @ Generates CPU Clock Signals for Microprocessor Systems M@ Reduces Measured EMI by 10 dB Nominal 4V to 7V Operating Supply Range @ supports 80286-, 80386-, 80486-, Pentium- and 29000-Based Designs HW Wide Range of Selectable Output Frequencies Including 50, 60, 100 and 120 Mhz @ Single, Low Cost Crystal Used as Reference Frequency M@ = Glitch-FreeSwitching M@ Power Down Mode for Low Power Consumption MH TTL or CMOS Compatible Outputs with 6 mA Drive Capability @ Pin Compatible with {MISC501 and IMISG502 M 16 PDIP and 16 PIN SOIC (300 Mil Body) Package Options 4 44.2 Ce, | REF a dor atts vec MHz 2 4 K MPSEL= So 23| SPECTRUM b si_8J SPREAD |___os prc Ts 16,| CLOCK K "| GEN sson 21 IMISG504 BLOCK DIAGRAM INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 SYSTEM CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PRODUCT DESCRIPTION The IMISC\G504 is a spectrum spread clock generator specially designed for personal computers, laser printers and other digital systems. IMISG504 uses a patent pending concept to generate popular clock frequencies that are intentionally broadbanded to reduce electromagnetic interference. IMISG\504 attenuates the radiated emission amplitudes from products associated with either the clock harmonics or any. signals derived from the clock signals nominally 10 dB and could significantly reduce the cost of complying with the regulatory requirements. PRCLK is the broadbanded output and can be programmed to generate 50, 60, 100 and 120 Mhz with the SO and $1 pins. A single, low cost external crystal is required as reference frequency for the synthesizer. Output modulation function can be turned off with the SSON pin. Power down mode adds the flexibility to operate the device in a completely static mode to reduce standby currents and simplify system board tests. PRCLK output is modulated 3.75%. P-DIP/SOIC CONNECTION DIAGRAM VDD 1 16 TS OSCing] 2 15 VDD OSCout 3 147] MPCLK vVSsS[] 4 139 VSS MPSEL[(] 5 127] PRCLK AVDD[]6 11 AVSS sod]? 10 LF1 siqg3 91 SSON APPLICATIONS IMISG504 eliminates the need for multiple oscillators and generates the CPU clock signals for personal computers, laser printers and other digital systems. Supports 8086-, 80286-, 80386-, 80486-, Pentium- and 29000-based designs. IMISG504 can be used with laptop or notebook comuters to save power by running the system slower than normal CPU speeds or completely disabling the clocks in standby mode. Page 1 of 8IMISG504 SYSTEM CLOCK CHIP January 1996 CMOS LS! SPECTRUM SPREAD CLOCK GENERATOR PIN DESCRIPTION OSCin, OSCout - These pins form an_ on-chip SSON - This pin controls the sprectrum spread reference oscillator when connected to terminals of an function. When low, PRCLK is modulated. When high, external 44.2 Mhz third overtone parallel resonant spreading is turned off. This pin has an internal pull-up. crystal. OSCin may also serve as an input for an externally generated CMOS level or AC coupled MPSEL - Controls MPCLK output frequency selections. reference signal. Table 2 shows the selected frequencies for MPCLK. This input has an internal pull-up. SO, and S1 - Frequency select inputs. These inputs contro! the PRCLK frequency selection. SO-S1 inputs MPCLK - This is a nonmodulated output. This output control the CPU clock frequencies. All these inputs can be programmed to be 3.7 Mhz or 11.06 Mhz. The have internal! pull-downs. selection of these frequencies are controlled by the MPSEL pin shown in Table 1. PRCLK - Output from the spectrum spread clock generator. Frequency selection is shown in Table 1. VSS - Circuit ground. Table 1 shows the output frequency selection VDD - Positive power supply. conditions. AVSS - Analog circuit ground. AVDD - Analog positive power supply. TS - Controls power down andTri-State Mode selection. When high, $1 input controls the mode selection as shown in Table 1 and Table 2. When low, device LF operates in normal mode. This pin has an internal pull- down. LF1 - This is the control output for the clock generator, It is a single-ended, tri-state output. Component connnections are shown in Figure 1. @ PRCLK TS $1 MPCLK 50 MHz xX 3.7 Mhz 100 MHz Xx 11.06 MHz 60 MHz 0 0; Power Down 420 Mhz 0 1; Power Down 0; Power Down 4 TEST 1: Power Down 4 4 Hi-Z TEST TABLE 2: When Power down address is selected, the rr Hi-Z VCO is tured off and the device goes to standby TABLE 1: When Power Down address is selected, the mode. Phase detector is in tri-state mode. VCO is turned off and the device goes to standby mode. Phase detector is in tri-state mode. The Table is based on using 44.2 Mhz crystal. Output can be scaled down using lower frequency crystals, see page 6. INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 406-263-6571 Page 2 of 8IMISG504 AY a Reel GO| January 1996 CMOS | S'! SPECTRUM SPREAD CLOCK GENERATOR MAXIMUM RATINGS This device contains circuitry to protect tie inputs against damage due to high static vohages o. electric field; however, precautions should be taker Voltage Relative to VSS: -0.3V to 7V Voltage Relative to VD: 0.3V Storage Temperature -65C to 150C Ambient Temperature: 0C to 70C Recommended Operating Range: 4.5-5.5V 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: All inputs are tiged high or low internally. ELECTRICAL CHARACTERISTICS Vss < (Vin or Vout) < Voo | Characteristic | Symbol | Min | Typ | "Max Units Input Low Voltage Vit - - 0.8 Vdc Input High Voltage Vin 2.0 - - Vde Input Low Current with Pull-up or Pull-down Mi - - 10/100 uA Output Low Voltage VoL 0.4 Vae IOL = 6mA Output High Voltage Vou 2.5 Vde IOH = 6MA Tri-State leakage Current loz - - 10 uA Static Supply Current {pb - - 250 uA Dynamic Supply Current icc - 25 30 mA Short Circuit Current Isc 25 - - 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 8ERS eEeT Ol! SYSTEM CLOCK CHIP January 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR SPECTRUM SPREAD CLOCK. MODULATION SELECTION TABLE Bandwidth Limit Frequencies as a % Value of PRCLK Low High Clock Spread 96.25% 100% SWITCHING CHARACTERISTICS [Characteristic = | symbol | Min | Typ Output Rise and Fall Time Measured at 10% - 90% of tron, trae - - 5 ns VDD Output Rise and Fall Time Measured at 0.8V - 2.0V troustrat - - TBD ns Output Duty Cycles TsymF1 - - 45/55 % Jitter One Sigma tjis - - 2 % of Fout VDD = 5V + 10%, TA = 0C, CL = 15pF OSCILLATOR CHARACTERISTICS Characteristic Symbol | Min Typ Max Units Conditions Transconductance gm 20 80 180 millimhos @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 VDD = +3.1V to +5.5V, TA = 0C to 70C VCO Gain Ky 35 55 65 Mhz/volt | AF/AV Measured with VCO Control at 2V - 3V Phase Detector Gain Kg 100 145 200 uA - INTERNATIONAL MICROCIRCUITS, INC. 525 LOS CO\CHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 4 of 8SYSTEM CLOCK CHIP PEST erey OE CMOS LSI January 1996 SPECTRUM SPREAD CLOCK GENERATOR EXTERNAL CONNECTIONS vec uo VV_ DIGITAL GND PLANE DIGITAL POWER PLANE_DVDD C11 1.5uH 10uF = ANALOG GND PLANE ANALOG POWER PLANE DVDD Ri C10 10 Ohms C3 | co . Zz 1 L c6 TLe VDD Test HS = DVDD] ps C5 tug /24XiN VoD 13 ee XOUT MPCLK 1 = 1 C4 033uF Al vss vss [3 | 10pFL 2 MPSEL PRCLK [4 2 L2]1.2uH 7 AVDD AVSS 7 1 HEADER C7| 10pF 3 SO LFI PG Lw si SSON R2 L c8 | 2K } JP1 tf Fc = MPSELS o cp OF SO JP2 : 56- | 2200pF JP3 st Test jh4 | DVDD NOTE1: KEEP C3, C4, C5, C6 CLOSE TO THEIR PINS (4, 11, 13, 10, 9 RESPECTIVELY. IMISG504 INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 5 of 8TESS ery 07.) SYSTEM CLOCK CHIP January 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR REFERENCE FREQUENCY VS OUTPUT FREQUENCIES PRCLK VS XTAL 120 100 4 Sl=1,S0=1 $1 =0, SO=1 80 60 4 $1 =1, S0=0 40 51 =0, SO0=0 20 4 0 LLELEELIEL Li PLETE EI TE ttt w ~~ ~ ws + ~w. as wv ar wT Tv wv ~~ ~~ ; 5 j re) + w co nN o oa Oo - ai oD Qi o py S o roe) 8 <9 on oO o + + tr + XTAL (MHz) INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 6 of 8IMISG504 SYSTEM CLOCK CHIP CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PACKAGE DRAWING AND DIMENSIONS | 16 PIN SOIC OUTLINE DIMENSIONS January 1996 INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 fe SYMBOL | AAARRA AA * c aa A 0.068 | 0.073 | 0078 | 1.73 | 1.86 1.99 FO PL Ay 0.002 | 0.005 | 0.008 f 005 | 013 | 021 E A2 0.066 | 0.068 | 0070 9 168 | 1.73 | 1.78 | B 0.010 | 0012 | 0015 | 0.25 | 030 | o38 Uuouu c 0.005 | 006 | 0.009 |} 013 | 015 | 0.22 Sle D 0.239 | 0.244 | 0.249 | 607 | 620 | 633 | p a E 0.205 | 0.209 | 0.212 9 520 | 530 | 538 Coon Anoop i Ae i} A e 0.0256 BSC 0.65 BSC t H 0.301 | 0307 | 0311 | 765 | 780 | 790 sti- al fe a o 4 8 a 4 8 L 0.022 | 0030 | 0037 | os5 | 075 | 095 et a eae eA a INCHES) MILLIMETERS | Cc SYMBOL | MIN | NOM |.MAX | MIN | NOM | MAX | . eo . A 0.150 | 0.160 | 0170 | 3.81 | 406 | 4.318 2 \a Ay 0.015 - - 0.381 - - B 0.016 | 0.018 | 0.020 | 040 | 045 | 050 oe tT y B, 0.056 | 0.059 | oo62 | 1.47 | 152 | 157 E p E1 By 0.046 | o049 | oosz | 1.17 | 1.24 | 1.22 | WA se . 0.008 | 0010 | 0.012 | 020 | 025 | 0.30 D 0.748 | 0.750 | 0.752 | 19.00 | 19.05 | 19.10 E 0.300 | 0312 | 0325 | 7.62 | 7924 | 8.255 E, 0.240 | 0.252 | 0.260 | 6096 | 649 | 6.604 E, 0.335 | 0345 | 0355 [| 351 | 876 | 901 e 0.100 BSC 2.54 BSC L 0.25 | 0230 | 0.135 [3.175 | 330 | 3.429 a a 7 18 o 7 15 Q, 0.059 | 0060 | 0061 J 150 | 153 | 1.55 Q 0.128 | 0130 | 0.132 [| 325 | 330 | 3.35 S 0.073 | 0075 | 0077 | 185 | 190 | 1.95 Page 7 of 8IMISG504 SYSTEM CLOCK CHIP January 1996 CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR ORDERING INFORMATION umber [Package Type = || = _~Production Flow IMISG504xP8 16 Pin Plastic Dip Commercial, 0C to + 70C IMISG504xXB 16 Pin SOIC Commercial, 0C to +70C Note: The x following the IMI Device Number denotes the device revsion. The ordering part number is formed by a combination of device number, device revision, package style, and screening as shown below. Marking: Example: IMI SG504xPB Date Code, Lot # IMISG504xPB | Flow B = Commercial, 0C 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 8 of 8