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| ICROCLOCK Description The MK1705A generates a low EMI output clock from a clock or crystal input. The part is designed to dither the LCD interface clock or other clocks for ATI's flat panel graphics controllers. The device uses ICS/MicroClock's proprietary mixture of analog and digital Phase-Locked Loop (PLL) technology to synthesize the frequency, and our patented technique to spread the frequency spectrum of the output, thereby reducing the frequency amplitude peaks by several dB. The MK1705A is designed to have the output spread centered around the input frequency. Refer to the MK1704A for spreading down from the input frequency, or the MK1714-0x for a crystal input and the widest selection of spread rates and multipliers. We offer many other clocks for computers and computer peripherals. Consult us when you need to remove crystals and oscillators from your board. MK1705A ATI Low EMI Clock Generator Features * Packaged in 8 pin SOIC * Provides a spread spectrum output clock * Supports ATI's flat panel controllers * Accepts a clock input, provides same frequency dithered output * Good for all VGA modes from 40 to 167 MHz * Peak reduction by 7dB - 14 dB typical on 3rd19th odd harmonics * Low EMI feature can be disabled * 3.3 V or 5 V 10% supply voltage * Advanced, low power CMOS process Block Diagram VDD GND S0 S1 Low EMI Enable Power Down Input Buffer PLL Clock Synthesis and Spread Spectrum Circuitry Output Buffer Clock Out Input Clock MDS 1705A B 1 Revision 8090 Printed 8/9/00 Integrated Circuit Systems, Inc. *525 Race Street*San Jose*CA * 95126 * (408)295-9800tel * www.icst.com ICROCLOCK Pin Assignment ICLK VDD GND CLK 1 2 3 4 8 7 6 5 PD S0 S1 LEE MK1705A ATI Low EMI Clock Generator Clock Output Select Table S1 S0 Input/Output Range pin 6 pin 7 pin 1/pin 4 0 0 40 to 167 MHz 0 1 60 to 167 MHz 1 0 Test 1 1 40 to 100 MHz Frequency spread vs. CLK Center 1.25% Center 0.5% Test Center 1% 8 pin SOIC Pin Descriptions Pin # 1 2 3 4 5 6 7 8 Name ICLK VDD GND CLK LEE S1 S0 PD Type I P P O I I I I Description Connect to graphics input clock Connect to +3.3V or +5V. Connect to ground. Spread spectrum Clock Output per table above. Low EMI Enable. Turns on the spread spectrum when high. Internal pull-up. Frequency Select 1 Input. Selects spread amount and CLK range per table above. Internal pull-up. Frequency Select 0 Input. Selects spread amount and CLK range per table above. Internal pull-up. Power Down. Stops output low when this pin is low. Internal pull-up. Key: I = Input, O = output, P = power supply connection External Components A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01F should be connected between VDD and GND on pins 2 and 3 as close to the chip as possible, and a 33 series terminating resistor may be used on the clock output if the trace is longer than 1 inch. MDS 1705A B 2 Revision 8090 Printed 8/9/00 Integrated Circuit Systems, Inc. *525 Race Street*San Jose*CA * 95126 * (408)295-9800tel * www.icst.com ICROCLOCK Electrical Specifications MK1705A ATI Low EMI Clock Generator Parameter Conditions Minimum Typical ABSOLUTE MAXIMUM RATINGS (note 1) Supply Voltage, VDD Referenced to GND Inputs Referenced to GND -0.5 Clock Outputs Referenced to GND -0.5 Ambient Operating Temperature 0 Soldering Temperature Max of 10 seconds Storage temperature -65 DC CHARACTERISTICS (at 5.0V unless otherwise noted) Operating Voltage, VDD 3 Input High Voltage, VIH, ICLK (VDD/2)+1 VDD/2 Input Low Voltage, VIL, ICLK VDD/2 Output High Voltage, VOH, CMOS IOH=-4mA VDD-0.4 Output High Voltage, VOH IOH=-25mA 2.4 Output Low Voltage, VOL IOL=25mA Operating Supply Current, IDD, 5V No Load 20 Operating Supply Current, IDD, 3.3V No Load 15 Input Capacitance S0, S1, PD, LEE pins 7 AC CHARACTERISTICS (at 5.0V unless otherwise noted) Input Clock Frequency 40 - 167 Input Clock Duty Cycle Time above VDD/2 20 Output Clock Rise Time 0.8 to 2.0V Output Clock Fall Time 2.0 to 0.8V Output Clock Duty Cycle Time above 1.5V 40 50 Output Clock Frequency Variation from Mean LEE high 0.5 to 1.25 3rd-19th odd harmonics EMI Peak Frequency Reduction 7 to 14 Maximum 7 VDD+.5V VDD+.5V 70 260 150 5.5 (VDD/2)-1 Units V V V C C C V V V V V V mA mA pF MHz % ns ns % % dB 0.4 80 1.5 1.5 60 Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability. 2. Typical values are at 25C. MDS 1705A B 3 Revision 8090 Printed 8/9/00 Integrated Circuit Systems, Inc. *525 Race Street*San Jose*CA * 95126 * (408)295-9800tel * www.icst.com ICROCLOCK MK1705A ATI Low EMI Clock Generator Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.) 8 pin SOIC Symbol A A1 B E INDEX AREA H C D E e H h L Inches Min Max 0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.0075 0.0098 0.1890 0.1968 0.1497 0.1574 .050 BSC 0.2284 0.2440 0.0099 0.0195 0.0160 0.0500 Millimeters Min Max 1.35 1.75 0.10 0.24 0.33 0.51 0.19 0.24 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.41 1.27 D A1 e Ordering Information Part/Order Number MK1705A MK1705ATR h x 45 A L B C Marking MK1705A MK1705A Package 8 pin SOIC Add tape and reel Temperature 0 to 70 C 0 to 70 C While the information presented herein has been checked for both accuracy and reliability, ICS MicroClock assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS MicroClock. ICS MicroClock reserves the right to change any circuitry or specifications without notice. ICS MicroClock does not authorize or warrant any ICS MicroClock product for use in life support devices or critical medical instruments. MDS 1705A B 4 Revision 8090 Printed 8/9/00 Integrated Circuit Systems, Inc. *525 Race Street*San Jose*CA * 95126 * (408)295-9800tel * www.icst.com |
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