MK1705A ICST | Alldatasheet

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Technical content

ATI Low EMI Clock Generator Integrated Circuit Systems, Inc. •525 Race Street•San Jose•CA • 95126 • (408)295-9800tel • www.icst.com ICROCLOCK 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. Block Diagram Description 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 3rd- 19th odd harmonics
  • Low EMI feature can be disabled
  • 3.3 V or 5 V ±10% supply voltage
  • Advanced, low power CMOS process Input Buffer VDD GND Output Buffer Clock Out Input Clock Low EMI Enable Power Down

ATI Low EMI Clock Generator Integrated Circuit Systems, Inc. •525 Race Street•San Jose•CA • 95126 • (408)295-9800tel • www.icst.com ICROCLOCK Pin Assignment 1 8 ICLK GND PD VDD LEE 8 pin SOIC CLK External Components A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01µF should be connected between VDD and GND on pins 2 and 3 as close to the chip as possible, and a 33Ω series terminating resistor may be used on the clock output if the trace is longer than 1 inch. Pin # Name Type Description

1 ICLK I Connect to graphics input clock

2 VDD P Connect to +3.3V or +5V. 3 GND P Connect to ground. 4 CLK O Spread spectrum Clock Output per table above. 5 LEE I Low EMI Enable. Turns on the spread spectrum when high. Internal pull-up. 6 S1 I Frequency Select 1 Input. Selects spread amount and CLK range per table above. Internal pull-up. 7 S0 I Frequency Select 0 Input. Selects spread amount and CLK range per table above. Internal pull-up. 8 PD I Power Down. Stops output low when this pin is low. Internal pull-up. Pin Descriptions Key: I = Input, O = output, P = power supply connection S1 S0 Input/Output Range Frequency spread pin 6 pin 7 pin 1/pin 4 vs. CLK 0 0 40 to 167 MHz Center ±1.25% 0 1 60 to 167 MHz Center ±0.5% 1 0 Test Test 1 1 40 to 100 MHz Center ±1% Clock Output Select Table

ATI Low EMI Clock Generator Integrated Circuit Systems, Inc. •525 Race Street•San Jose•CA • 95126 • (408)295-9800tel • www.icst.com ICROCLOCK 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 25°C. Electrical Specifications Parameter Conditions Minimum Typical Maximum Units ABSOLUTE MAXIMUM RATINGS (note 1) Supply Voltage, VDD Referenced to GND 7 V Inputs Referenced to GND -0.5 VDD+.5V V Clock Outputs Referenced to GND -0.5 VDD+.5V V Ambient Operating Temperature 0 70 °C Soldering Temperature Max of 10 seconds 260 °C Storage temperature -65 150 °C DC CHARACTERISTICS (at 5.0V unless otherwise noted)DC CHARACTERISTICS (at 5.0V unless otherwise noted) Operating Voltage, VDD 3 5.5 V Input High Voltage, VIH, ICLK (VDD/2)+1 VDD/2 V Input Low Voltage, VIL, ICLK VDD/2 (VDD/2)-1 V Output High Voltage, VOH, CMOS IOH=-4mA VDD-0.4 V Output High Voltage, VOH IOH=-25mA 2.4 V Output Low Voltage, VOL IOL=25mA 0.4 V Operating Supply Current, IDD, 5V No Load 20 mA Operating Supply Current, IDD, 3.3V No Load 15 mA Input Capacitance S0, S1, PD, LEE pins 7 pF AC CHARACTERISTICS (at 5.0V unless otherwise noted)AC CHARACTERISTICS (at 5.0V unless otherwise noted) Input Clock Frequency 40 - 167 MHz Input Clock Duty Cycle Time above VDD/2 20 80 % Output Clock Rise Time 0.8 to 2.0V 1.5 ns Output Clock Fall Time 2.0 to 0.8V 1.5 ns Output Clock Duty Cycle Time above 1.5V 40 50 60 % Output Clock Frequency Variation from Mean LEE high ±0.5 to ±1.25 % EMI Peak Frequency Reduction 3rd-19th odd harmonics 7 to 14 dB

ATI Low EMI Clock Generator Integrated Circuit Systems, Inc. •525 Race Street•San Jose•CA • 95126 • (408)295-9800tel • www.icst.com ICROCLOCK 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.

Ordering Information

Part/Order Number Marking Package Temperature MK1705A MK1705A 8 pin SOIC 0 to 70 °C MK1705ATR MK1705A Add tape and reel 0 to 70 °C Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.) B D E H e A1 C A h x 45° L INDEX AREA 8 pin SOIC Inches Inches Millimeters Millimeters Symbol Min Max Min Max A 0.0532 0.0688 1.35 1.75 A1 0.0040 0.0098 0.10 0.24 B 0.0130 0.0200 0.33 0.51 C 0.0075 0.0098 0.19 0.24 D 0.1890 0.1968 4.80 5.00 E 0.1497 0.1574 3.80 4.00 e .050 BSC .050 BSC 1.27 BSC 1.27 BSC H 0.2284 0.2440 5.80 6.20 h 0.0099 0.0195 0.25 0.50 L 0.0160 0.0500 0.41 1.27