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| ABE0101/02/04/06 Low EMI Spread Spectrum Multiplier Clock FEATURES * * * * * * * * * Spread Spectrum Clock Generator with selectable multiplier from 1x to 6x outputs. Output frequency ranges: 10MHz to 180MHz. Accepts input from crystal or reference clock. Selectable Center, Down or Asymmetric Spread Modulation. Selectable Modulation rate. TTL/CMOS compatible outputs. 3.3V Operating Voltage. Low short term jitter. Available in 8-Pin 150mil SOIC. PIN CONFIGURATION XIN/FIN XOUT/SD*^ SC0^ SC1^ 1 8 VDD SC2^ FOUT GND ABE010x 2 3 4 7 6 5 XIN/FIN = 10 ~ 30 MHz Note: ^: Internal pull-up resistor (120k for SD, 30 k for SC0-SC2). *: The value of SD is latched upon power-up. The internal pull-up resistor results in a default high value when no pull-down resistor is connected to this pin (recommended external pull-down resistor of 27 k). DESCRIPTION The ABE0101/02/04/06 are Spread Spectrum Clock Generators designed for the purpose of reducing EMI in high-speed digital systems. Any output frequency from 10 to 180MHz can be selected by programming 6 multiplier modes. The device is designed to operate from a crystal or reference clock input and provides 1x to 6x modulated clock outputs. OUTPUT CLOCK (FOUT) SELECTION SD 1 1 0 1 0 1 0 1 0 1 0 1 0 1 SC2 0 0 0 0 0 0 0 1 1 1 1 1 1 1 SC1 0 0 0 1 1 1 1 0 0 0 0 1 1 1 SC0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 FOUT (01) X1 X1 X1 X1 X1 X1 X1 X1 X1 X1 X1 X1 X1 X1 FOUT (02) X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 FOUT (04) X4 X4 X4 X4 X4 X4 X4 X4 X4 X4 X4 X4 X4 X4 FOUT (06) X6 X6 X6 X6 X6 X6 X6 X6 X6 X6 X6 X6 X6 X6 SST Modulation Magnitude 0.50% 1.00% 1.50% 2.00% Fin / 512 2.50% 3.00% 3.50% OFF Freq. C C D C A C A C A C A C A Type 0.25% 0.5% -1.0% 0.75% +0.25% ~ -1.25% 1.0% +0.5% ~ -1.5% 1.25% +0.75% ~ -1.75% 1.5% +1.0% ~ -2.0% 1.75% +1.25% ~ -2.25% Notes: C: Center Spread. A: Asymmetric Spread. D: Down Spread. 30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 1 ABE0101/02/04/06 Low EMI Spread Spectrum Multiplier Clock BLOCK DIAGRAM XIN/FIN XOUT XTAL OSC PLL SST FOUT SC(0:2) Control Logic PIN DESCRIPTIONS Name XIN/FIN XOUT/SD SC0 SC1 GND FOUT SC2 VDD Number 1 2 3 4 5 6 7 8 Type I B I I P O I P Description Crystal input to be connected to fundamental parallel mode crystal.(CL=18pF) or clock input. At power-up, this pin is an input pin to select modulation type. After input sampling, this pin is crystal output. Has internal pull up resistor. Digital control input to select modulation magnitude. Has internal pull-up. Digital control input to select modulation magnitude. Has internal pull-up. Ground. Modulated Clock Frequency Output. The frequency before modulation is synthesized by multiplying the input frequency by 1X, 2X, 4X, 6X depending on the part number (ABE0101, 02, 04, 06). Digital control input to select modulation magnitude. Has internal pull-up. Power Supply. FUNCTIONAL DESCRIPTION Selectable spread spectrum and modulation magnitudes The ABE0101/02/04/06 provides selectable spread spectrum modulation type, as well as selectable modulation magnitude. Selection is made by connecting specific pins to a logical "zero" or "one" according to the output clock selection table on page 1. In order to reduce the number of pins on the chip, the ABE0101/02/04/06 uses pin 2 (XOUT/SD) as a bi-directional pin. The pin serves as modulation type selector input (SD) upon power-up (see output clock selection table on page 1), and as XOUT crystal connection as soon as the input has been latched. Pins 3 (SC0), 4 (SC1), and 7 (SC2) are used as inputs to select the spread spectrum modulation magnitude as shown on the output clock selection table (page 1). 30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 2 ABE0101/02/04/06 Low EMI Spread Spectrum Multiplier Clock Connecting a selection pin to a logical "one" All selection pins have an internal pull-up resistor (30k for pins 3, 4, 7, and 120k for pin 2). This internal pull-up resistor will pull the input value to a logical "one" (pull-up) by default, i.e. when no resistive load is connected between the pin and GND. No external pull-up resistor is therefore required for connecting a logical "one" upon power-up. Connecting a selection pin to a logical "zero" For an input only pin, i.e. pins 3 (SC0), 4 (SC1), and 7 (SC2), the pin simply needs to be grounded to pull the input down to a logical "zero". Connecting the bi-directional pin (SD) to a logical "zero" will however require the use of a 27k loading resistor between the pin and GND. ELECTRICAL SPECIFICATIONS 1. Absolute Maximum Ratings PARAMETERS Supply Voltage Input Voltage, dc Output Voltage, dc Storage Temperature Ambient Operating Temperature* Junction Temperature Lead Temperature (soldering, 10s) ESD Protection, Human Body Model SYMBOL VDD VI VO TS TA TJ MIN. -0.5 -0.5 -65 -40 MAX. 4.6 VDD+0.5 VDD+0.5 150 85 125 260 2 UNITS V V V C C C C kV Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other conditions above the operational limits noted in this specification is not implied. * Note: Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only. 2. Timing Characteristics PARAMETERS Rise Time Fall Time Output Duty Cycle Cycle to Cycle Jitter Cycle to Cycle Jitter SYMBOL Tr Tf DT Tcyc-cyc Tcyc-cyc CONDITIONS Measured at 0.8V ~ 2.0V @ 3.3V Measured at 2.0V ~ 0.8V @ 3.3V FOUT=48MHz @ 3.3V FOUT=72MHz @ 3.3V MIN. 0.8 0.78 45 TYP. 0.95 0.85 50 MAX. 1.1 0.9 55 100 100 UNITS ns ns % ps ps 30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 3 ABE0101/02/04/06 Low EMI Spread Spectrum Multiplier Clock 3. DC/AC Specifications PARAMETERS Supply Voltage Input High Voltage Input Low Voltage Input High Current Input Low Current Output High Voltage Output Low Voltage Input Frequency Maximum interruption of FIN Load Capacitance Pull-up Resistor Pull-up Resistor Short Circuit Current 3.3V Dynamic Supply Current CL Rup Rup Isc ICC SYMBOL VDD VIH VIL IIH IIL VOH VOL FXIN FIN CONDITIONS MIN. 2.97 0.7*VDD TYP. MAX. 3.63 0.3*VDD 100 100 UNITS V V V A A IOH=5mA, VDD=3.3V IOL=6mA, VDD=3.3V When using a crystal When using reference clock When using reference clock Between Pin XIN and XOUT* PIN 2 PIN 3, 4, 7 No Load 2.4 10 10 18 120 30 50 20 0.4 30 30 100 MHz MHz s pF k k mA mA *Note: Pin XIN and XOUT each has a 36pF capacitance. When used with a XTAL, the two capacitors combined load the crystal with 18pF. If driving XIN with a reference clock signal, the load capacitance will be 36pF (typical). 30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 4 ABE0101/02/04/06 Low EMI Spread Spectrum Multiplier Clock PACKAGE INFORMATION 8 PIN Narrow SOIC ( mm ) SOI C Symbol A A1 B C D E H L e Min. 1.47 0.10 0.33 0.19 4.80 3.80 5.80 0.38 1.27 BSC Max . 1.73 0.25 0.51 0.25 4.95 4.00 6.20 1.27 A1 B C L e A D E H ORDERING INFORMATION For part ordering, please contact our Sales Department: 30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 PART NUMBER The order number for this device is a combination of Device number, Package type and Operating temperature range ABE010x x C PART NUMBER TEMPERATURE C=COMMERCIAL I=INDUSTRIAL PACKAGE TYPE S=SOIC Order Number ABE0101SC-T ABE0101SC ABE0102SC-T ABE0102SC ABE0104SC-T ABE0104SC ABE0106SC-T ABE0106SC Marking ABE0101SC ABE0101SC ABE0102SC ABE0102SC ABE0104SC ABE0104SC ABE0106SC ABE0106SC Package Option SOIC -Tape SOIC -Tube SOIC -Tape SOIC -Tube SOIC -Tape SOIC -Tube SOIC -Tape SOIC -Tube and Reel and Reel and Reel and Reel Abracon Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information furnished by Abracon is believed to be accurate and reliable. However, Abracon makes no guarantee or warranty concerning the accuracy of said information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product. LIFE SUPPORT POLICY: Abracon's products are not authorized for use as critical components in life support devices or systems without the express written approval of the President of Abracon Corporation. 30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 5 |
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