OSIDWI wu AT SYSTEM CLOCK CHIP CMOS LSI MaY 1993 PLL FREQUENCY SYNTHESIZER PRODUCT FEATURES PRODUCT DESCRIPTION w Generates All Essential Clock Signats for the The IMISC406 is a clock chip for Motherboards. The Motherboards. ae cm8 metus. two moependent yco's and uses . a single 14. z external crystal to generate a m 4V to 7V Operating Supply Range. essential clock signals. The IMISC406 is designed to m Supports 80286, 80386 and 80486 Based Designs. generate CPU clock options of 88 MHz, 80 MHz, m Integrates TURBO, CPU Clocks and Buffered 66.6 MHz, 50 MHz, 40 MHz, 32 MHz, 24 MHz, 14.318 MHz Output. he MHz and 8 MHz, giving Cou ae r the user. The ; , lection on the CPU clock outputs is @ Wide Range of Selectable Output Frequencies requency se . - Turbo . The user Including 88, 80, 66.6, 50, 40, 32, 24, 16 and 8 MHz. determined by the S0-S3 and Tu ms 0 can use the 32 MHz and 16 MHz as fixed frequencies @ Single, Low Cost Crystal (14.318 MHz) Used as and select the variable frequencies using SO-S3 pins Reference Frequency. for the CPU clock. S3 pin selects single or double m Two independent Clock Generators. eee on the MCLK2 output determined by ah. ahi -S2. Turbo pins allow the user to easily switch a eiten Free Switching for Both Clock Generators. CPU clock frequencies. When TURBO1 pin goes low, @ 50% Duty Cycle. the MCLK2 output goes to 16 or 8 MHz depending on m@ Power Down Mode for Low Power Consumption. the status of S3 pin. When TURBO2 pin goes low, the @ Two Turbo Modes with Turbo Output. output frequency stepped down to the next lower @ TTL or CMOS Compatible Outputs with 12 mA Drive frequency selected by S0-S2. Capability. Both VCOs can be turned off in the standby mode, w On-Chip Buffers Can Be Used to Replace External reducing the current consumption to a few FOT244 Devices. a eereS the tout are mode, rere ; except 14. ZOU are low and both phase @ Low, Short and Long Term Jitter. detectors are tri-stated. @ 24 PDIP and 24 Pin SSOP (209 Mil Body) Package Options. B1 and B2 pins provide additional buffers needed for signal buffering on a typical board design. These buffers can be used to replace FCT244 buffers and CLRt4 reduce component cost and board space. Each MHz output provides 12mA sink and source capability and can be used for TTL or CMOS signal buffering. CLOCK GEN : = YAU IMISC406 eliminates the need for multiple oscillators CLOCK GEN toner and generates all the essential clock signals for the 2 Personal Computer Motherboards. Supports 8086, BIoUT 80286, 80386SX, 80386DX and 80486 based B20uT2 designs. IMISC406 can be used with laptop or notebook computers to save power by running the system slower then normal CPU speeds or completely disabling the clocks in standby mode. IMISC406 BLOCK DIAGRAM INTERNATIONAL MICROCIRCUITS INC. 525 LOS COCHES ST. Page 1 MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571IMISC406 SYSTEM CLOCK CHIP PIN DESCRIPTION Xin, Xout - These pins form an on-chip reference oscillator when connected to terminals of an external parallel resonant crystal (nominally 14.31818 MHz). Xin may also serve as input for an externally generated reference signal. SO, $1, S2, and S3 - Frequency select inputs. These inputs control the MCLK2 frequency selection. S0-S2 inputs control the CPU clock frequencies. S3 selects single or double frequency determined by SO-S2. All these inputs have internal pull-ups. Table 1 shows the output frequency selection conditions. MCLK2 FREQUENCY SELECTION MCLK2 INPUTS (MHz) TURBO1| $2 | S1 TURBO2=1 | TURBO2=0 o $3=0 | S3=1 | $3=0 | S3=1 8 16 8 16 12 24 8 16 16 32 12 24 20 40 16 32 25 50 20 40 33.3 | 66.6 25 50 ~j-)J/O/oO;/oO/oO]x 40 80 33.3 | 66.6 /|/o] |] a] sw] | 1 OO -=|O/O0O/;/-/+/]/O/;/O] x o;/])/ola/o;/4-/oO]*K 44 88 40 80 _ Power TEST Down 44 88 _ a _ _ TABLE 1: When Power Down address is selected, all VCOs are turned off and the device goes to standby mode. Ail outputs are set to low. Phase detectors are in tri-state mode. TURBO1 and TURBO2 - Turbo function select inputs. These inputs are used to slow down the System Clock. When TURBO1 goes low, MCLK2 output is set to 16 MHz or 8 MHz depending on the state of S3 pin. When TURBO2 goes low, MCLK2 output is stepped down to Page 2 next lower frequency selected by SO-S2. Both of these inputs have internal pull-ups. Btin and B2in - Buffer input pins. These are on-chip, two independent buffers that can be used for additional signal buffering. Each input has a pull-up and can be used to buffer TTL or CMOS signals. B1 is a single buffer, and its output is B1OUT. B2 is a triple buffer with three parallel outputs. Each output is capable to sink or source 12 mA. MCLK2 - Master clock output. Programmable output frequencies can be selected using SO-S3 and TURBO1 and TURBO2 inputs shown in Table 1. 16 MHz - 16 MHz AT Bus Clock output. 14.318 MHz - 14.31818 MHz output. Buffered output of on-chip reference oscillator or externally provided reference. TURBO - Turbo output pin. This is an open drain output. if either TURBO1 or TURBOZ2 is low, the output will be in tri-state. When both TURBO1 and TURBO2 are high, output goes low as shown in Table 2. This pin can be used to drive the TURBO LED. It can sink 12 mA. PD1 and PD2 - These are the phase detector outputs for the clock generators. They are single-ended, tri-state outputs for use as loop error signal. A 0.1uF capacitor to ground should be connected from each pin to form the loop filter. VSS - Circuit ground. VDD - Positive power supply. TURBO INPUT TURBO1 TURBO2 0 1 0 1 TABLE 2 INTERNATIONAL MICROCIRCUITS ING. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571IMISC406 SYSTEM CLOCK CHIP BLOCK DIAGRAM 14.318 MHz TURBO POI MCLK2 PD2 16 MHz 126% IMI SC406 BLOCK DIAGRAM INTERNATIONAL MICROCIRCUITS INC. 525 LOS COCHES ST. Page 3 MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571IMISC 406 MAXIMUM RATINGS Voltage Relative to VSS : Voltage Relative to VDD: Storage Temperature : Ambient Temperature : -0.3V to 7V 0.3V -65C to 150C -55C to 125C Recommended Operating Range: 4V - 7V 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) < VoD Unused inputs must always be tied to an appropriate logic voltage level (either Vss or VoD). ELECTRICAL CHARACTERISTICS Characteristic Min Typ Max Units input Low Voltage VIL - - 0.8 Vde Input High Voltage VIH 2.0 - - Vde Input Low Current lit ; 9 A With Pull-up or Pull-down - +50 H Input High Current 14 ; 9 A With Pull-up or Pull-down +50 H Output Low Voltage OLD 12mA VOL - - 0.4 vde Output High Voltage loH= 12MA VOH 2.4 - - Vde Tri-State Leakage Current loz - - 10 WA Static Supply Current IDp - - 10 uA Dynamic Supply Current lec - - 0.3 mA/MH2/VCO mA Short Circuit Current Isc 25 - - mA VDD = 5V +10%, TA = 0C to +70C SWITCHING CHARACTERISTICS | Characteristic Symbol Min Typ Max Units Output Rise and Fall Time TTLH, tTHL - - 2 ns TS teal Outputs z - - 35 ns Duty Cycle - 45/55 50/50 45/55 % utputs Jitter One Sigma - - - 100 ps input Rise and Fal! Times OSCIN tTLH, tTHL - 3 1 us VDD = 5V +10%, TA = 0C to +70C Page 4 INTERNATIONAL MICROCIRCUITS INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571$0-S3 OR 4 TURBO INPUTS x h F lL | MCLK OUTPUTS t : Current cycle time t2: Output high time. t3 = 4t t3: Lock time. 7ms max ed qT Changing Outputs t1: time to first positive edge after address change TURBO INPUTS CU tz TURBO OUTPUT " Hi-Z INTERNATIONAL MICROCIRCUITS INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571 Page 5IMISC406 SYSTEM CLOCK CHIP CONNECTION DIAGRAMS PLASTIC DIP PACKAGE SSOP PACKAGE oO / es Xin <1 24> 14.318 MHz Xin 10 24> 14.318 MHz Xout qj2 23> Btout Xout a2 23> Btout Btin q3 22> VOD Blin q3 22P VDD vss 4 21D PD2 vss <14 21> PD2 B2out 3 as 20> 16 MHz B2out 3 rar 20> 16 MHz TURBO2 6 19 [> TURBO1 TURBO2 16 19 TURBO! so a7 18> B2out2 S0 a7 18 B2out2 B2in je 17 B2out1 B2in <3 17 [> B2out1 PD1 a9 16 vss PD1 qj9 16> VSS voD <J10 15 [> MCLK 2 vpD <0 15[> MCLK2 $3 12 13 TURBO $3 <J12 13[> TURBO EXTERNAL CONNECTIONS Cit 4.7 uF Cil2 Ch .033uF 10 pf XTALIN 14.318 MHz XTALOUT = Blout 14.318 MHz Btin VOD c2 vss PD2 10 pt B2out3 16 MHz TURBO2 TURBO! 1 so B2out2 B2in B2out1 PDI VSS 0 w VDD MCLK2 $1 82 $3 TURBO 12/31/91 DIP-6 IMISC406 Page 6 INTERNATIONAL MICROCIRCUITS INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571IMISC406 SYSTEM CLOCK CHIP PACKAGE DRAWINGS AND DIMENSIONS 24 PIN SKINNY PLASTIC DIP DIMENSIONS INCHES MILLIMETERS SYMBOL MIN | NOM | MAX | MIN | NOM | MAX / -_a2~- A - - | 180] - - | 4.57 w/e A1 |oo20| - - | 051 - - B 0.015 | 0.018 | 0.020 | 0.38 | 0.46 | 0.51 LODBODADADAD Bt 0.045 | 0.050 | 0.055 | 1.14 | 1.27 | 1.40 ie B2 0.035 | 0.040 | 0.045 | 0.89 | 1.02 | 1.14 eE D E1 C 0.008 | 0.010 | 0.012 | 0.20 | 0.25 | 0.30 _{ le 12 D 1.159 | 1.163 | 1.167 | 29.438 | 29.462 | 29.489 VVV VV VV VV VV V D E 0.300} - | 0325] 7.62 - | 8.255 7 Bua {a2 ar rarer E1 0.258 | 0.260 | 0.262 | 6.55 | 6.60 | 6.65 E2 | 0.260 | 0.262 | 0.264] 6.60 | 6.65 | 6.70 | ll. L e1 0.100 BSC 2.54 BSC S oa Jj 8 L 0.125 | 0.130 | 0.135] 3.18 | 3.30 | 3.43 B a oe o ce 24 PLASTIC SKINNY DIP a 0 ? 15 0 7 15 (300 mil narrow body) Q1 0.055 | 0.060 | 0.065 | 1.40 | 1.52 | 1.65 Q2 - 130 - - 3.30 - S 0.028 | 0.033 | 0.038 | 0.71 0.84 | 0.97 24 PIN SOIC OUTLINE DIMENSIONS . INCHES MILLIMETERS a SYMBOL AARAG AA = MIN | NOM | MAX | MIN | NOM | MAX f | A | 0.068 | 0.073 | 0.078 | 1.73 | 1.86 | 1.99 tid At | 0.002 | 0.005 | 0.008 | 0.05 | 0.13 | 0.21 | A2 | 0.066 | 0.068 | 0.070 | 1.68 | 1.73 | 1.78 | 0.010 | 0.012 | 0.015 | 0.25 | 0.30 | 0.38 wie 0.005 | 0.006 | 0.009 | 0.13 | 0.15 | 0.22 |< p ____| _ a CRRAF Spap vet 0.318 | 0.323 | 0.328 | 8.07 | 8.20 | 8.33 0.205 | 0.209 | 0.212 | 5.20 | 5.30 | 5.38 ria }/rlyel|miyolo!l]omw >| Kk > K re 0.0256 BSC 0.65 BSC 6 0.301 | 0.307 | 0.311 | 7.65 | 7.80 | 7.90 SSOP PACKAGE 0 4 o 8 a Q o 4 eo 8 ao 0.022 | 0.030 | 0.037 | 0.55 | 0.75 | 0.95 INTERNATIONAL MICROCIRCUITS INC. 525 LOS COCHES ST. Page? MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571IMISC406 SYSTEM CLOCK CHIP Oye ea Cm Oe WE el Part Number Package Type Production Fiow iMISC406xPB Plastic Dip Commercial, 0C to +70C IMISC406xXB 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 SC406xPB Date Code, Lot # IMISC406xPB Page 8 B = Commercial, 0C to +70C Package P = Plastic Dip X = SSOP Revision IMI Device Number INTERNATIONAL MICROCIRCUITS INC. 525 LOS COCHES ST. MILPITAS, CA 95035 TEL :408-263-6300 FAX : 408-263-6571