SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product FREQUENCY TABLE PRODUCT FEATURES • • • • • • • • • • • • • • • Supports Pentium Processors. 3 Hi Drive CPU clocks. Up to 8 SDRAM clocks for 2 DIMMs. Supports Power Management. 7 PCI synchronous clocks. Optional common or mixed supply mode: (Vdd = Vddq3 = Vddq2 = 3.3V) or (Vdd = Vddq3 = 3.3V, Vddq2 = 2.5V) < 250ps skew CPU and SDRAM clocks. < 250ps skew among PCI clocks. I2C 2-Wire serial interface Programmable registers featuring: - enable/disable each output pin - mode as tri-state, test, or normal - 24/48 MHz selections 1 IOAPIC clock for multiprocessor support. 48-pin SSOP and TSSOP package Spread Spectrum Technology for up to 13dB of EMI reduction Xin Xout REF OSC 3 CPU PCI 0 60.0 30.0 1 66.6* *Spread Spectrum mode capable 33.3* CONNECTION DIAGRAM IMISG571D BLOCK DIAGRAM Buffers SEL REF0,1,2 Vddq2 IOAPIC0 REF1 1 48 Vdd REF0 2 47 REF2 Vss 3 46 Vddq2 Xin 4 45 IOAPIC0 Xout 5 44 PWR_DWN# MODE 6 43 Vss Vddq3 7 42 CPUMCLK0 PCICLK_F 8 41 CPUCLK PCICLK0 9 40 Vddq2 Vss 10 39 CPUMCLK1 PCICLK1 11 38 PCICLK2 12 37 Vss PCICLK3 13 36 SDRAM0 PCICLK4 14 35 SDRAM1 Vddq3 15 34 Vddq3 PCICLK5 16 33 SDRAM2 Vss 17 32 SDRAM3 SEL 18 31 Vss SDATA 19 30 SDRAM4 SDCLK 20 29 SDRAM5 Vddq3 N/C Buffer Vddq2 SDATA SDCLK 3 Buffers Vddq3 SEL PLL1 dly 8 Buffers 6 CPUMCLK (0:1) CPUCLK SDRAM0~7 PCICLK0~5 Vddq3 21 28 48/24MHZ 22 27 SDRAM6/CPU_STOP# 48/24MHZ 23 26 SDRAM7/PCI_STOP# Vss 24 25 Vdd Buffers PCI_STOP# CPU_STOP# PWR_DWN# MODE PCICLK_F Buffer 2 Buffer 48/24MHZ PLL2 Buffer 48/24MHZ Purchase of I C components of International Microcircuits, Inc. or one of its sublicensed Associated Companies conveys a license under the 2 2 Philips I C Patent Rights to use these components in an I C system, 2 provided that the system conforms to the I C Standard Specification as defined by Philips. INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 1 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product PIN DESCRIPTION Xin, Xout - These pins form an on-chip reference oscillator when connected to terminals of an external parallel resonant crystal (nominally 14.318 MHz). Xin may also serve as input for an externally generated reference signal. PCICLK_F - A PCI clock output that does not stop until in power down mode. It is synchronous with other PCI clocks. SEL - Standard frequency select input. It has internal pull-up. IOAPIC0 - Buffered output of 14.3MHZ for multiprocessor support. It is powered by Vddq2. CPUCLK - Hose clock output primarily use to drive the SDRAM. CPUMCLK(0:1) - High drive host clock output primarily used to drive Mobil Pentium processor modules. SDRAM(0:5) - Synchronous DRAM DIMs clocks. They are powered by Vddq3. SDRAM6/CPU_STOP# - If MODE=1, this pin is a Synchronous DRAM DIMs clock output. If MODE=0, this pin is a CPU_STOP# input signal, where a low level stops the CPU however, the SDRAM clocks will stay active. It has an internal pull-up. SDRAM7/PCI_STOP# - If MODE=1, this pin is a Synchronous DRAM DIMs clock output. If MODE=0, this pin is a PCI_STOP# input signal, where a low level stops the PCI clocks. It has an internal pull-up. MODE - A low level on this pin causes pins 26, and 27 to be power management inputs PCI_STOP#, and CPU_STOP# respectly. A high level on this pin causes pins 26, and 27 to be clock output signals SDRAM7, and SDRAM6 respectively. It has an internal pull-up resistor. REF(0:2) - Buffered outputs of on-chip reference. PWR_DWN# - Power down pin. When this pin is asserted low, the IC is in shutdown mode where all circuitry is turned off including VCO, crystal buffer and PCICLK_F. It has an 2 internal pull-up. The I C interface is disabled with the PWR_DWN# pin is low. 48/24MHz(0:1) - Programmable 48 MHZ or 24 MHZ clock outputs. 2 SDATA - serial data of I C 2-wire control interface. Has internal pull-up resistor. 2 SDCLK - serial clock of I C 2-wire control interface. Has internal pull-up resistor. Vss - Ground pins for the chip. Vdd - 3.3 Volt power supply pins for analog circuit and core logic. Vddq3 - Power supply pins for 3.3V IO pins. Vddq2 - Power supply pins for 2.5V/3.3V IO pins. PCICLK(0:5) - Low skew (<250pS) clock outputs for PCI frequencies. These buffers voltage level is controlled by Vddq3 INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 2 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product POWER MANAGEMENT FUNCTIONS All clocks can be individually enabled or stopped via the 2-wire control interface. All clocks are stopped in the low state. All clocks maintain a valid high period on transitions from running to stopped and on transitions from stopped to running when the chip was not powered down. On power up, the VCOs will stabilize to the correct pulse widths within about 0.2 mS. The CPU, SDRAM, and PCI clocks transition between running and stopped by waiting for one positive edge on PCICLK_F followed by a negative edge on the clock of interest, after which high levels of the output are either enabled or disabled. When MODE=0, pins 26 and 27 are inputs PCI_STOP# and CPU_STOP# respectively (when MODE=1, these functions are not available). A particular output is enabled only when both the serial interface and these pins indicate that it should be enabled. The IMISG571D clocks may be disabled according to the following table in order to reduce power consumption. All clocks are stopped in the low state. All clocks maintain a valid high period on transitions from running to stopped. On low to high transitions of PWR_DWN#, external circuitry should allow 0.2 mS for the VCOs to stabilize prior to assuming the clock periods are correct. The CPU and PCI clocks transition between running and stopped by waiting for one positive edge on PCICLK_F followed by a negative edge on the clock of interest, after which high levels of the output are either enabled or disabled. CPU_STOP# X 0 0 1 1 PCI_STOP# X 0 1 0 1 PWR_DWN# 0 1 1 1 1 CPUCLK LOW LOW LOW 66/60 MHZ 66/60 MHZ PCICLK LOW LOW 33/30 MHZ LOW 33/30 MHZ OTHER CLKs LOW RUNNING RUNNING RUNNING RUNNING XTAL & VCOs OFF RUNNING RUNNING RUNNING RUNNING POWER MANAGEMENT TIMING PCICLK_F PCI_STOP# PCICLK(0:5) CPU_STOP# CPUCLK(0:2) INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 3 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product 2-WIRE I2C CONTROL INTERFACE The 2-wire control interface implements a write only slave interface. The IMISG571D cannot be read back. Subaddressing is not supported, thus all preceding bytes must be sent in order to change one of the control bytes. The 2wire control interface allows each clock output to be individually enabled or disabled. It also allows 24/48 MHZ frequency selection and test mode enable. During normal data transfer, the SDATA signal only changes when the SDCLK signal is low, and is stable when SDCLK is high. There are two exceptions to this. A high to low transition on SDATA while SDCLK is high is used to indicate the start of a data transfer cycle. A low to high transition on SDATA while SDCLK is high indicates the end of a data transfer cycle. Data is always sent as complete 8-bit bytes, after which an acknowledge is generated. The first byte of a transfer cycle is a 7-bit address with a Read/Write bit as the LSB. Data is transferred MSB first. The device will respond to writes to 10 bytes (max) of data to address D2 by generating the acknowledge (low) signal on the SDATA wire following reception of each byte. The device will not respond to any other control interface 2 conditions. The I C interface is disabled when the PWR_DWN# pin is low. Previously set control registers are retained. SERIAL CONTROL REGISTERS NOTE: The Pin# column lists the affected pin number where applicable. The @Pup column gives the state at true power up. Bytes are set to the values shown only on true power up, and not when the PWR_DWN# pin is activated. Following the acknowledge of the Address Byte (D2), two additional bytes must be sent: 1) “Command Code “ byte, and 2) “Byte Count” byte. Although the data (bits) in these two bytes are considered “don’t care”, they must be sent and will be acknowledged. Byte 0: Function Select Register Bit 7 6 5 4 3 2 1 0 @Pup 0 0 0 0 1 1 0 0 Pin# * * * * 23 22 Description Reserved Reserved Reserved Reserved 48/24 Mhz (a”1” sets the output to 48MHz, a “0” sets the output to 24MHz) 48/24 Mhz (a”1” sets the output to 48MHz, a “0” sets the output to 24MHz) Bit1 Bit0 1 1 Tri-State 1 0 Spread Spectrum operating mode 0 1 Test Mode 0 0 Normal operating mode INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 4 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product SERIAL CONTROL REGISTERS (Cont.) Function Table Function Description Tri-State Test Mode Normal SEL=1 Normal SEL=0 CPU Hi-Z Tclk/2 66 60 PCI Hi-Z Tclk/4 CPU/2 CPU/2 SDRAM Hi-Z Tclk/2 CPU CPU Outputs Ref Hi-Z Tclk 14.318 14.318 IOAPIC Hi-Z Tclk 14.318 14.318 24MHZ Hi-Z Tclk/4 24 24 48MHZ Hi-Z Tclk/2 48 48 Notes: 1. Tclk is a test clock over driven on the Xin input during test mode. 2. The frequency ratio Fout/Fin for the USB output is 3.35294. Byte 1: CPU, 48/24 MHz Clock Register (1 = enable, 0 = Stopped) Bit @Pup Pin# 7 6 5 4 3,2 1 1 x x 1 23 22 39 1 0 1 1 41 42 Description 48/24 MHz enable/Stopped 48/24 MHz enable/Stopped Reserved Reserved Power Control for CPUMCLK1 Bit 2 Bit 3 0 0 = Disabled 1 0 = Not Allowed 0 1 = Not Allowed 1 1 = High Drive CPUCLK enable/Stopped CPUMCLK0 enable/Stopped Byte 2: PCI Clock Register (1 = enable, 0 = Stopped) Bit 7 6 5 4 3 2 1 0 @Pup x 1 1 1 1 1 1 1 Pin# 8 16 14 13 12 11 9 Description Reserved PCICLK_F enable/Stopped PCICLK5 enable/Stopped PCICLK4 enable/Stopped PCICLK3 enable/Stopped PCICLK2 enable/Stopped PCICLK1 enable/Stopped PCICLK0 enable/Stopped INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 5 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product SERIAL CONTROL REGISTERS(Continued) Byte 3: SDRAM Clock Register ( 1 = enable, 0 = Stopped ) Bit 7 6 5 4 3 2 1 0 @Pup 1 1 1 1 1 1 1 1 Pin# 26 27 29 30 32 33 35 36 Description SDRAM7 enable/Stopped SDRAM6 enable/Stopped SDRAM5 enable/Stopped SDRAM4 enable/Stopped SDRAM3 enable/Stopped SDRAM2 enable/Stopped SDRAM1 enable/Stopped SDRAM0 enable/Stopped Byte 4: Additional SDRAM Clock Register (1 = enable, 0 = Stopped) Bit 7 6 5 4 3 2 1 0 @Pup x x x x x x x x Pin# - Description Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Byte 5: Peripheral Control (1 = enable, 0 = Stopped) Bit 7 6 5 4 3 2 1 0 @Pup x x 1 1 x 1 1 1 Pin# 45 47 1 2 Description Reserved Reserved Reserved IOAPIC0 enable/Stopped Reserved REF2 enable/Stopped REF1 enable/Stopped REF0 enable/Stopped INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 6 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product SPREAD SPECTRUM CLOCK GENERATION (SSCG) Spread Spectrum is a modulation technique applied here for maximum efficiency in minimizing Electro-Magnetic Interference radiation generated from repetitive digital signals mainly clocks. A clock accumulates EM energy at the center frequency it is generating. Spread Spectrum distributes this energy over a small frequency bandwidth therefore spreading the same amount of energy over a spectrum. This technique is achieved by modulating the clock down from its resting frequency by a certain percentage (which also determines the energy distribution bandwidth). In this product, the modulation is 1.0% down from the resting frequency. Amplitude (dB) Without Spectrum Spread With Spectrum Spread Modulated Center Frequency Frequency(MHz) Rested Center frequency Spectrum Analysis INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 7 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product MAXIMUM RATINGS This device contains circuitry to protect the inputs against damage due to high static voltages or electric Voltage Relative to VSS: -0.3V field; however, precautions should be taken to avoid Voltage Relative to VDD: 0.3V application of any voltage higher than the maximum Storage Temperature: rated voltages to this circuit. For proper operation, Vin -65ºC to + 150ºC Operating Temperature: and Vout should be constrained to the range: 0ºC to +70ºC Maximum Power Supply: VSS<(Vin or Vout)<VDD 7V Unused inputs must always be tied to an appropriate logic voltage level (either VSS or VDD). ELECTRICAL CHARACTERISTICS Characteristic Symbol Min Typ Max Units Conditions Input Low Voltage VIL - - 0.8 Vdc - Input High Voltage VIH 2.0 - - Vdc - Input Low Current IIL -66 µA Input High Current IIH 5 µA Output Low Voltage IOL = 4mA VOL - - 0.4 Vdc All Outputs (see buffer spec) Output High Voltage IOH = 4mA VOH 2.4 - - Vdc All Outputs Using 3.3V Power (see buffer spec) Tri-State leakage Current Ioz - - 10 µA Dynamic Supply Current Idd - - 100 mA CPU = 66.6 MHz, PCI = 33.3 MHz Static Supply Current Isdd - - 1 mA Powered Down = Active Short Circuit Current ISC 25 - - mA 1 output at a time - 30 seconds VDD = VDDQ3 =3.3V ±5%, VDDQ2 = 2.5V±5% , TA = 0ºC to +70ºC INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 8 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product SWITCHING CHARACTERISTICS Characteristic Symbol Min Typ Max Units Conditions Output Duty Cycle - 45 50 55 % Measured at 1.5V CPU to PCI Offset tOFF 1 - 4 ns 15 pf Load Measured at 1.5V tSKEW - - 250 ps 15 pf Load Measured at 1.5V ∆Period Adjacent Cycles ∆P - - +250 ps - Jitter Spectrum 20 dB Bandwidth from Center BWJ 500 KHz Overshoot/Undershoot Beyond Power Rails Vover - 1.5 V 22 ohms @ source of 8 inch PCB run to 15 pf load Ring Back Exclusion VRBE 0.7 2.1 V note1 Buffer out Skew All CPU and PCI Buffer Outputs - VDD = VDDQ3 =3.3V ±5%, VDDQ2 = 2.5V±5% , TA = 0ºC to +70ºC note 1: Ring Back must not enter this range. TB40_V TYPE BUFFER CHARACTERISTICS FOR IOAPIC AND CPUCLKs Characteristic Symbol Min Typ Max Units Conditions Pull-Up Current IOH 22 - 31 mA Vout = VDD - .5V Pull-Up Current IOH 37 - 56 mA Vout = 1.25V Pull-Down Current IOL 30 - 41 mA Vout = 0.4V Pull-Down Current IOL 75 - 102 mA Vout = 1.2V Rise/Fall Time Min Between 0.4 V and 2.0 V TRFmin 0.4 - - nS 10 pF Load Rise/Fall Time Max Between 0.4 V and 2.0 V TRFmax - - 1.9 nS 20 pF Load VDD = VDDQ3 =3.3V ±5%, VDDQ2 = 2.5V±5% , TA = 0ºC to +70ºC TB5L TYPE BUFFER CHARACTERISTICS FOR REF(1:2) and 48/24 MHz Characteristic Symbol Min Typ Max Units Conditions Pull-Up Current IOH 13 - 17 mA Vout = VDD - .5V Pull-Up Current IOH 30 - 44 mA Vout = 1.5V Pull-Down Current IOL 13 - 19 mA Vout = 0.4V Pull-Down Current IOL 32 44 19 mA Vout = 1.5V Rise/Fall Time Min Between 0.4 V and 2.4 V TRFmin 1.0 - - nS 10 pF Load Rise/Fall Time Max Between 0.4 V and 2.4 V TRFmax - - 2.0 nS 20 pF Load VDD = VDDQ3 =3.3V ±5%, VDDQ2 = 2.5V±5% , TA = 0ºC to +70ºC INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 9 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product TB40AX TYPE BUFFER CHARACTERISTICS FOR REF0 and SDRAM(0:7) Characteristic Symbol Min Typ Max Units Conditions Pull-Up Current IOH 30 - 39 mA Vout = VDD - .5V Pull-Up Current IOH 75 - 109 mA Vout = 1.5V Pull-Down Current IOL 30 - 40 mA Vout = 0.4V Pull-Down Current IOL 75 - 103 mA Vout = 1.2V Rise/Fall Time Min Between 0.4 V and 2.4 V TRFmin 0.5 - - nS 20 pF Load Rise/Fall Time Max Between 0.4 V and 2.4 V TRFmax - - 2.0 nS 30 pF Load VDD = VDDQ3 =3.3V ±5%, VDDQ2 = 2.5V±5% , TA = 0ºC to +70ºC TB4L TYPE BUFFER CHARACTERISTICS FOR PCICLK(0:5,F) Characteristic Symbol Min Typ Max Units Conditions Pull-Up Current IOH 18 - 23 mA Vout = VDD -.5V Pull-Up Current IOH 44 - 64 mA Vout = 1.5V Pull-Down Current IOL 18 - 25 mA Vout = 0.4V Pull-Down Current IOL 50 - 70 mA Vout = 1.5V Rise/Fall Time Min Between 0.4 V and 2.4 V TRFmin 0.5 - - nS 15 pF Load Rise/Fall Time Max Between 0.4 V and 2.4 V TRFmax - - 2.0 nS 30 pF Load VDD = VDDQ3 =3.3V ±5%, VDDQ2 = 2.5V±5% , TA = 0ºC to +70ºC INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 10 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product TYPE 6 BUFFER CHARACTERISTICS FOR CPUMCLK IN HIGH DRIVE MODE Characteristic Symbol Min Typ Max Units Conditions Pull-Up Current IOH 130 180 250 mA Vout = 1.0 V Pull-Up Current IOH 65 90 120 mA Vout = 2.0 V Pull-Down Current IOL 125 170 220 mA Vout = 1.2 V Pull-Down Current IOL 40 60 80 mA Vout = 0.3 V Rise/Fall Time Min Between 0.4 V and 2.0 V TRFmin 0.4 - - nS 10 pF Load Rise/Fall Time Max Between 0.4 V and 2.0 V TRFmax - - 1.6 nS 20 pF Load VDD = VDDQ3 =3.3V ±5%, VDDQ2 = 2.5V±5% , TA = 0ºC to +70ºC CRYSTAL AND REFERENCE OSCILLATOR PARAMETERS Characteristic Symbol Min Typ Max Units Frequency Fo 12.00 14.31818 16.00 MHz Tolerence TC - - +/-100 PPM Calibration note 1 TS - - +/- 100 PPM Stability (Ta -10 to +60C) note 1 TA - - 5 PPM Aging (first year @ 25C) note 1 Mode OM - - - Pin Capacitance CP DC Bias Voltage VBIAS 0.3Vdd Vdd/2 0.7Vdd V Startup time Ts - - 30 µS Load Capacitance CL - 20 - pF Effective Series resonant resistance R1 - - 40 Ohms Power Dissipation DL - - 0.10 mW Shunt Capacitance CO - -- 8 pF 6 Conditions Parallell Resonant pF Capacitance of XIN and Xout pins to ground (each) the crystals rated load. note 1 note 1 crystals internal package capacitance (total) For maximum accuracy,the total circuit loading capacitance should be equal to CL. This loading capacitance is the effective capacitance across the crystal pins and includes the device pin capacitance (CP) in parallel with any circuit traces, the clock generator and any onboard discrete load capacitors. Budgeting Calculations Typical trace capacitance, (< half inch) is 4 pF, Load to the crystal is therefore 2.0 pF Clock generator internal pin capacitance of 36 pF, Load to the crystal is therefore 3.0 pF External crystal loading capacitors (connect to ground) 15.0 pF the total parasitic capacitance would therefore be = 20.0.0 pF. Note 1: It is recommended but not mandatory that a crystal meets these specifications. INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 11 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product PCB LAYOUT SUGGESTION Via to VDD Island Via to GND plane IMISG571D 3.3V VCC FB1 48 1 2 3 C3 4 22µF 5 C4 6 7 47 46 C11 45 44 FB2 43 VCC2.5V 42 41 8 C12 40 C10 9 10 11 12 13 C5 14 15 16 17 18 19 C6 20 21 22 23 24 39 22µF 38 C14 37 36 35 34 C9 33 32 31 30 29 28 C8 27 26 25 C7 This is only a layout recommendation for best performance and lower EMI. The designer may choose a different approach but C4, C5, C6, C7, C8, C9, C10, C11and C12 (all are 0.1µf) should always be used and placed close to their VDD pins. INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 12 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product PACKAGE DRAWING AND DIMENSIONS 48 PIN SSOP OUTLINE DIMENSIONS INCHES SYMBOL C L MIN NOM MAX MIN NOM MAX A 0.095 0.102 0.110 2.41 2.59 2.79 A1 0.008 0.012 0.016 0.20 0.31 0.41 A2 0.085 0.090 0.095 2.16 2.29 2.41 b 0.008 0.010 0.0135 0.203 0.254 0.343 c 0.005 .008 0.010 0.127 0.20 0.254 D 0.620 0.625 0.637 15.75 15.88 16.18 E 0.291 0.295 0.299 7.39 7.49 7.59 H E D a A2 e 0.0256 BSC 0.640 BSC H 0.395 0.408 0.420 10.03 10.36 10.67 L 0.024 0.030 0.040 0.61 0.76 1.02 a 0º 4º 8º 0º 4º 8º A A1 B MILLIMETERS e INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 13 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product PACKAGE DRAWING AND DIMENSIONS (Cont.) 48 PIN TSSOP DIMENSIONS D R0.1 INCHES SYMBOL NOM MAX MIN NOM MAX E E1 BO L20 -B385 MIN MILLIMETERS A - - 0.0433 - - 1.10 A1 0.002 0.004 0.006 0.05 0.10 0.15 A2 0.033 0.035 0.037 0.85 0.90 0.95 L 0.019 0.023 0.029 0.50 0.60 0.75 R 0.043 - - 0.10 - - b 0.006 - 0.010 0.170 - 0.27 b1 0.006 0.008 0.009 0.170 0.20 0.225 c 0.004 - 0.007 0.105 - 0.175 c1 0.004 0.005 0.006 0.105 0.125 0.145 θ 0° - 8° 0° - 8° SURFACES ROUGHNESS: 6+ 27n(RZ) 4 RD [10° TYP -C- 0.07 C B e R1.30 0.10~0.15 1.0 0.00 ~ 0.05 e SECTION V-V [2? 0.50 BSC D 0.488 0.492 0.496 12.40 12.50 12.60 E 0.313 0.319 0.325 7.95 8.1 8.25 E1 0.236 0.240 0.244 6.00 6.1 6.20 0.05 MAX. R0.15 4 0.020 BSC 1.0 0.05 MAX. 1.0 A E b .08 C B A (8?) c1 0.25 c A A2 R A1 L b1 L1 DET DET INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 14 of 15 SG571D I2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology for Pentium Processor Based Designs. Approved Product ORDERING INFORMATION Part Number Package Type Production Flow IMISG571DYB 48 PIN SSOP Commercial, 0ºC to +70ºC IMISG571DTB 48 PIN TSSOP Commercial, 0ºC to +70ºC Note: The ordering part number is formed by a combination of device number, device revision, package style, and screening as shown below. Marking: Example: IMI SG571DYB Date Code, Lot # IMISG571DYB Flow B = Commercial, 0ºC to + 70ºC Package Y = SSOP T = TSSOP Revision IMI Device Number INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Rev.1.4 8/10/98 Page 15 of 15