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| PI6C4512 PLL Clock Multiplier Features * Zero ppm multiplication error * Input crystal frequency of 5 - 30MHz * Input clock frequency of 4 - 50MHz * Output clock frequencies up to 200MHz * Low period jitter 80ps (100~200MHz) * Duty cycle 45/55% of output clock * 9 Selectable frequencies controlled by S0 and S1 pins * Operating voltages of 3.0 to 5.5V * Packaging: - 8-pin SOIC (W) - Pb-Free and Green 8-pin SOIC (WE) Description Pericom Semiconductor's PI6C4512 is a precision generalpurpose clock synthesizer that reaches maximum 200MHz. This device uses an external low-cost crystal to generate very accurate rate and stable system clocks. This is the most cost effective way to reduce high-price, high frequency crystals. Using PLL techniques, the device uses a standard fundamental mode, inexpensive crystal to produce output clocks up to 200 MHz. The internal Logic divider is to generate nine different popular multiplication factors, allowing one chip to output many common frequencies. Block Diagram Pin Configuration S0 S1 X1 / ICLK X2 PLL Clock Synthesis and Control Circuit Output Buffer CLK X1 / ICLK VCC 1 2 3 4 8 7 6 5 X2 Crystal Oscillator Output Buffer REF GND REF S0 CLK VCC GND Clock Output Table S1 0 0 0 M M M 1 1 1 S0 0 M 1 0 M 1 0 M 1 CLK x4 x (16/3) x5 x 2.5 x2 x (10/3) x6 x3 x8 Notes: 1. M = leave unconnected (self-biases to VCC/2). w w w .d ee sh ta a u. t4 om c 1 PS8763 05/23/05 www..com S1 PI6C4512 PLL Clock Multiplier Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested) Storage temperature ............................................................ -65 to 150C Ambient Operating Temperature ..............................................0 to 70C Supply Voltage to Ground Potential (VCC)........................ -0.3 to +7.0V Inputs (Referenced to GND)...................................... -0.5 to VCC +0.5V Clock Output (Referenced to GND) .......................... -0.5 to VCC +0.5V Soldering Temperature (Max of 10 seconds)............... 260C (Max.10s) Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Pin Description Name X1/ICLK VCC GND REF CLK S0 S1 X2 Pin 1 2 3 4 5 6 7 8 Description Crystal connection or clock input. Connect to +3.3V or +5V. Ground Buffered crystal oscillator output clock Clock output Multiplier select pin 0. Connect to GND or VCC or float (no connection) Multiplier select pin 1. Connect to GND or VCC or float (no connection) Crystal connection. Leave unconnected for clock input. External Components The PI6C4512 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.01F should be connected between each VDD and GND as close to the chip as possible. A series termination resistor of 33 may be used for each clock output. The crystal should be a fundamental mode, parallel resonant. Crystal capacitors should be connected from X1 to ground and X2 to ground to optimize the inital accuracy. The value of these capacitors igiven by the following equation, where CL is the crystal load capacitance: Crystal caps (pF) = (CL -15) x2. So for a crystal with 18pF load capacitance, two 6pF caps should be used. 2 PS8763 05/23/05 PI6C4512 PLL Clock Multiplier Recommended Operation Conditions Symbol VCC TA Description Supply Voltage Operating Temperature Test Condition Min. 3 0 Typ. Max. 5.5 70 Units V C DC Electrical Characteristics (VCC = 3.3V 0.3V, TA = 0~70C, unless otherwise noted) Symbol VCC ICC VIH VIL VIH VIM VIL VOH VOL IS Description Supply voltage Supply current Input logic high Input logic low Input logic high Input mid-level Input logic low High-level output voltage Low-level output voltage Short circuit current IOH = -12mA IOL = 12mA no load, 20MHz Crystal Test Condition Pin VCC VCC ICLK ICLK S0, S1 S0, S1 S0, S1 CLK, REF CLK, REF CLK 70 2.4 0.4 mA VCC-0.5 VCC/2 0.5 V Min. 3 (VCC/2) +1 12 VCC/2 VCC/2 (VCC/2)-1 Typ. Max. 5.5 20 Units V mA AC Electrical Characteristics (VCC = 3.3V 0.3V, TA = 0 ~ 70C, unless noted) Symbol fIN fOUT tr tf Duty Parameter Input Frequency Output frequency(2) Crystal Clock VCC: 4.5 to 5.5V VCC: 3.0 to 3.6V 0.8 to 2.0V, with 15pF load 2.0 to 0.8V, with 15pF load At VCC/2 100MHz~200MHz Test Condition Pin ICLK ICLK CLK CLK CLK CLK CLK CLK 45 10 80 100 Min. 5 4 20 20 1 ns 1 50 55 ps % kHz Typ. Max. 30 50 200 180 MHz Unit Output clock rise time Output clock fall time Output clock duty ycle PLL bandwidth(1) Period Jitter Notes: 1. Only reference for design 2. The phase relationship between input and output clocks can change at power up. 3 PS8763 05/23/05 PI6C4512 PLL Clock Multiplier Packaging Mechanical: 8-Pin SOIC (W) Ordering Information Ordering Code PI6C4512W PI6C4512WE Package Code W WE Package Description 8-pin SOIC Pb-Free and Green 8-pin SOIC Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com 4 PS8763 05/23/05 |
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