ys wa i i IMISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 Preliminary PRODUCT FEATURES @ Reduces Clock-related EMI up to 20 dB M@ Replicates and modulates externally applied signals @ 3.0V to 5.5V operating supply range @ Wide range of selectable output frequencies between 14 and 120 Mhz m@ Output may be equal to a fraction of, or multiple of, input frequency mM Will accept input frequencies between 14 and 120 Mhz @ TTL or CMOS compatible outputs with 6mA drive capability M 20 pin SSOP or Skinny Dip packages M@ Frequency spreading with Fout center frequency or with Fout maximum frequency of spread m Compliant with all major CISC, RISC, and DSP processors Low, short-term jitter Synchronous output enable Power-down mode for lower power consumption Locks to externally applied signal BLOCK DIAGRAM | ~ - 20 REFout Xin 1 Xout osc Fin PLL Dc FREQUENCY 4a GENERATOR 15 Fout STOP 5 |INPUT TEST _To | FREQUENCY EMI 10 |RANGE MULTIPLIER CONTROL SELECT WP FT EP Ri RO so S81 S2 S83 INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 CMOS LSI! SPECTRUM SPREAD CLOCK GENERATOR PRODUCT DESCRIPTION The IMISM530 is a sprectrum spread modulator designed for personal computers, laser printers and other digital systems. The IMISM530 uses a patent pending concept to broadband clock frequencies to reduce measured electromagnetic emissions from system clocks and their associated harmonics. The reduction can significantly reduce the cost of complying with regulatory requirements without degrading digital wave forms. The IMISM530 is extremely flexible in that it can be programmed to broadband frequencies using the output as a center frequency or as the upper frequency limit of the band. It can be used to multiply or divide the input frequency, as well as provide a beffered unmodulated output of the input frequency. The IMISM530 can synchronously stop the modulated output at the low logic level. Power-down mode adds the flexibility to operate the device in a completely static mode to reduce standby currents and simplify system board tests. PDIP/SSOP CONNECTION DIAGRAM oscin| 1 20 [- REFout OSCout_] 2 19 [,.OVDD AVDDL] 3 18 | OVSS D.ci]4 17 [JRO STOP =| 5 16|R1 | SOr] 6 15 (i Fout LFCI 7 141082 AVSS<] 8 13 [DVSS siq,9 12 [JDVDD SSONL] 10 1183 | APPLICATIONS The IMISM530 applied to existing clock frequencies will modulate that frequency centering on the input frequency, orupt to that frequency and can be used to generate multiples or fractions of that frequency. It can be used with any input frequency between 14 Mhz and 120 Mhz. See page 3 for 3-volt supply information. Page 1 of 9IM!ISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 Preliminary CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR PIN DESCRIPTION Xin, Xout - 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. Fout - Modulated output. $1, SO - Frequency input multiplier settings. See chart to determine multiplication or devision desired. S1 has internall pull-up; SO has internal pull-down. LF - This is a phase detector output for the clock signal. It is a single-ended, tri-state output for use as loope rror signal. See Figure 1. REFout - Buffered output of the crysta! or frequency in (unmodulated). $2-, $3 - Control pins for setting amount of modulation. See chart for settings. S2 has internal pull-up; S3 has internal pull-down. R1, RO - Control pins for frequency input ranges. M Frequency 14.318 Mhz to 30 Mhz; R1 - 0, RO = 1. M Frequency 30 Mhz to 60 Mhz: R1 = 1, RO=0. @ Frequency 60 Mhz to 120 Mhz: R1 = 1, RO= 1. @ Have internal pull-up. TEST - Internal pull-down to VSS, defaults to 0 state for operating mode. Used by factory for testing. Consult IMI if required. Page 2 of 9 D_C - Down/center pin, which controls the center frequency of the output modulation. When D_C = 1, the modulation is centered on the Fout. When d_C = 0, the maximum frequency of the modulation is equal to the Fout. The minimum is determined by the modulation range selection pins, S3 and S2. Has internal pull-down STOP - When equal to 1, the clock is stopped. TTL input synchronously stops output at low logic level. Has internall pull-down. OVDD - Oscillator positive power supply. Can be common to DVDD. OVSS - Oscilaltor circuit ground. Can be common to DVSS AVDD - Analog icrcuit positive power supply. AVSS - Analog circuit gorund. DVDD - Digital positive power supply. DVSS - Digital circuit ground. LF CO ee ee ee 4K R2 ~~ 160 pf C1 1000 pf C2 FIGURE 1 INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571IMISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 CMOS LSI Preliminary SPECTRUM SPREAD CLOCK GENERATOR a m PREAD O OD ATOR FREQ = e f = *Range of Fin Multiplier Settings | Output | Range of Fout | Required R Settings Modulation and Power F fin Down Min Max So Min Max R41 RO $3 $2 14 30 1 14 30 See Table 2 14 30 2 28 60 See Table 2 14 30 4 56 120 See Table 2 25 60 0.5 13 30 See Table 2 25 60 1 25 60 See Table 2 25 60 2 50 120 See Table 2 50 120 0.25 13 30 See Table 2 50 120 0.5 25 60 See Table 2 50 120 1 50 120 See Table 2 Reserved N/A N/A N/A As Set As Set Power Down Hi-Z N/A N/A N/A As Set As Set Power Down 0 N/A N/A N/A As Set As Set Power Down 1 N/A N/A N/A As Set As Set Table 1 When Power-down address is selected, the VCO is turned off and the modulation is in the standby mode. The phase detector is in the tri-state mode. af} ofa] os | OLOl]O |] [| 2 /O/OlO]- |] [> Blololo}=|slolalalo}s|alo]@ Clololo}alolajafo}alalo}a * Note: When operating in 3-voit applications, the input frequency is restricted to no more than 66% of the maximum frequency of the applicable Fin range. = pi] ap ord f eo EMI Reductuion Modulation Settings Bandwidth Limit Frequencies as a % Value of Fout Down/Center = 0 Down/Center = 1 Low High Low High Minimum EMI Control 98.75% 100% 99.375% 100.625% Se 97.5% 100% 98.75% 101.25% Alternate Setti 95.0% 100% 97.5% 102.5% Maximum EMI Reduction 90.0% 100% 95% 105% Table 2 In systems less tolerant of clock freqency changes, the S2 and S3 set to 0 is recommended. When down/center is set to 0, the center frequency is shifted down by one-half the modulation range. See illustrations 1 and 2. INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 3 of 9IMISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 Preliminary 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 fields; 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: Voltage Relative to VSS: -0.3V to 6V Voltage Relative to VD: 0.3V -66C to + 150C OC to + 70C 3.0V - 5.5V Storage Temperature: Operating Temperature: Recommended Operating Range: VSS < (Vin or Vout ) < VDD All inputs are tied high or low internally. Characteristic Symbol Min Typ / Max 7 Units Input Low Voltage VIL - - 0.8 Vde Input High Voltage VIH 2.0 - - Vde Input Low Current il - - 100 pA Input High Current HH . . 100 HA Output Low Voltage IOL= 6mA VOL - - 0.4 vde Output High Voltage IOH = 6MA VOH 2.5* - - Vde Tri-State Leakage Current loz - - 10 pA Static Supply Current IDD - - 250 nA 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 4 of 9CMOS LSI SPECTRUM SPREAD CLOCK GENERATOR SWITCHING CHARACTERISTICS Characteristic Symbol Min Typ Max Units Output Rise and Fall Time Measured at 10% - tTLH, tTHL - - 5 ns 90% of VDD Output Rise and Fall Time Measured at 0.8V - tTLH, tTHL - - 3 ns 2.0V Output Duty Cycles TsymF 1 - - 45/55 % Peak-to Peak Jitter One Sigma tjis - 2 % of F out VDD = 5V + 10%, TA = 0C to 70C, CL = 15pF OSCILLATOR CHARACTERISTICS | Characteristic Symbol | Min Typ Max Units Conditions Transconductance gm 20 80 180 millimhos - Output Impedance Zo - 200 800 ohms - Input Capacitance Ci 8 13 18 pf - Output Capacitance Co 3 6 9 pf - DC Bias Voltage VB 15 | VDD/2 3.5 Volt - Start-up Time ts - - 2 ms @ VDD = 4.5V Duty Cycle TsymF 1 - - 45/55 % - o vee! a Characteristic Symbol Min Typ Max Untis Conditions VCO Gain Ko 35 55 65 MHz/volt AF/AV Measured with VCO Control at 2V - 3V Phase Detector Gain Kd 100 145 200 HA - INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 5 of 9IMISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 CMOS LSI! Preliminary SPECTRUM SPREAD CLOCK GENERATOR SPECTRUM SPREAD CLOCKING DOWN-SPREAD NON-SPREAD ~__ CLOCK SPREAD CLOCK CENTER FREQUENCY SPREAD-CENTER NON-SPREAD CLOCK SPREAD CLOCK DOWN-CENTER SPREAD ( ' ( PERIOD + SPREAD MAX. PERIOD eT | a. SPREAD MAX ______ L Z|. PERIOD CENTER-SPREAD SPREAD CLOCK MAX. PERIOD MIN. PERIOD INTERNATIONAL MICROCIRCUITS, INC. 525 LOS C-DCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 4(18-263-6571 Page 6 of 9IMISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 CMOS LSI Preliminary SPECTRUM SPREAD CLOCK GENERATOR APPLICATION SUGGESTION a T. gy irr Ge XTAL t]oscin _REFout |20 LOAD 4 2| OSCout ovoD [19 Lt 40 oh 3; AVDD OVSS [18 ons lone RO [17 L rot | |_5| STOP R1 [16 C1 6 15 C2 | SO Fout Otuf | Te 7) LF s2 [14 LOAD 8] AVSS Dvss [13 i 9) s1 Dvop [12 ae vee) _10] TEST $3 |11 = 1 | 10pf 4K ohms \] _ Ew DVDD| ca T C7 L = soot 160pf INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 7 of 9IMISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 CMOS LSI Preliminary SPECTRUM SPREAD CLOCK GENERATOR PACKAGE DRAWING AND DIMENSIONS Cc _ ae INCHES MILLIMETERS +> \e-a SYMBOL | MIN | NOM | MAX NOM | MAX A 0.145 | - - 3.93 TO ee. al 0.020 | - - - t h B 0.016 | 0.018 045 | 050 E Db E1 By 0.056 | 0.059 1.52 | 1.57 J oe eer! Bo 0.046 | 0.049 127 | 1.32 mes C 0.008 | 0.010 0.25 | 030 , D > D 1.028 | 1.030 26.16 | 26.21 v {oz >| |< 82 a E 0.298 | - - 7.67 i Pw) tA E, | 0.248 [| 0250 6.36 | 6.40 t | | fT E, 0.335 | 0.345 8.76 | 9.01 | | | Ff ~ e) 0.100 BSC 2.54 BSC | le > < lle Bi L L 0.128 | 0.130 3.30 | 335 s el > <B a 0 7 7 15 Qy 0.059 0.060 1.53 1.55 Q2 0.128 0.130 3.30 3.35 S 0.063 0.065 1.65 1.70 INCHES MILLIMETERS MIN NOM NOM | MAX 0.068 | 0.073 186 | 1.99 0.002 | 0.005 0.13 | 0.21 0.066 | 0.068 173 1.78 0.010 | 0.012 0.30 038 > a ans 0.005 0.006 0.15 0.22 CooL CHAP A. * ! . 0.278 | 0.284 7.20 | 7.33 | J | A; 0.205 | 0.209 5.30 | 5.38 0.0256 BSC 0.65 BSC 0.307 | 0.311 7.80 7.90 0 4 g 4 ae 0.022 0.030 0.037 INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 8 of 9IMISM530 REDUCED EMI CLOCK MODULATOR CHIP February 1996 CMOS LSI! Preliminary SPECTRUM SPREAD CLOCK GENERATOR Part Number Package Type Production Flow IMISM530XPB 20 Pin Plastic Dip Commercial, 0C to + 70C IMISM530XYB 20 Pin SSOP Commercial, 0C to + 70C Note: 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 SM530XPB Date Code, Lot# IMISM530XPB | Flow B = Commercial, 0C to + 70C | a Package P = Plastic Dip / Y = SSOP Revisions IMI Device Number INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571 Page 9 of 9