MK2014A ICST | Alldatasheet

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Technical content

Fast Ethernet Clock Source MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax ICR OCLOC K The MK2014A is the ideal way to generate clocks for Fast Ethernet cards or systems. It provides 20MHz and 25MHz clocks from an inexpensive 14.31818 MHz crystal or clock. In an 8 pin SOIC, the MK2014A can save component count, board space, and cost over surface mount crystals and oscillators, and increase reliability by eliminating mechanical devices from the board. The MK2014A is a functionally identical update of the MK2014 and should be used in all designs. The only change is in crystal load capacitance as stated on page 2. MicroClock offers many other clocks for computers and computer peripherals. Consult your MicroClock representative when you need to remove crystals and oscillators from your board. Block Diagram Description Features

  • Packaged in 8 pin SOIC
  • Input crystal or clock frequency of 14.318 MHz
  • Lowest jitter in the industry reliably clocks sensitive Ethernet devices.
  • Output clock frequencies of 20.00 MHz and

25.00 MHz

  • Zero ppm synthesis error in the output clocks
  • Full CMOS outputs with 25mA drive capability at TTL levels
  • 3.3V or 5V±10% supply voltage
  • Advanced, low power CMOS process
  • Insensitive to input clock duty cycle Crystal Oscillator VDD GND Clock Synthesis and Control Circuitry Output Buffer Output Buffer

20 MHz

14.318 MHz

14.31818 MHz

Fast Ethernet Clock Source MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax ICR OCLOC K Number Name Type Description 1 X1/ICLK XI Crystal Connection. Connect to a 14.31818 MHz crystal or clock. 2 VDD P Connect to +5V. 3 GND P Connect to ground. 4 25M O 25.000 MHz clock output. 5 GND P Connect to ground. 6 20M O 20.000 MHz clock output. 7 14M O 14.31818 MHz buffered crystal clock output. 8 X2 XO Crystal Connection to a 14.31818 MHz crystal, or leave unconnected for clock input. Pin Descriptions Key: I = Input, O = output, P = power supply connection Pin Assignment 14.3 MHz in (crystal caps not shown) Pin 1 0.1µF 25MHz out G V 33Ω (optional) Suggested Layout External Components/Crystal Selection A minimum number of external components are required for proper oscillation. A decoupling capacitor of 0.1 µF should be connected between VDD and GND on pins 2 and 3, and 33 Ω terminating resistors should be used on clock outputs with traces longer than 1 inch. For a clock input, connect to X1 and leave X2 unconnected. For a crystal input, a parallel resonant 14.31818 MHz crystal is recommended. The frequency accuracy of the crystal should be 30 ppm or better. External capacitors from each of the X1 and X2 pins to ground should be added with a value in pF equal to (C L-13)*2, where C L is the crystal load capacitance in pF. So for a crystal with load capacitance of 16 pF, 6 pF capacitors should be used. [Note that the MK2014S required crystal load capacitors of (C L-4)*2.] 33Ω (optional) 14.3MHz out1 8 X1/ICLK 14M GND VDD 20M GND 8 pin SOIC 25M 33Ω (optional) 20MHz out

Fast Ethernet Clock Source MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax ICR OCLOC K 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. 3. Provided an exact clock input or a properly tuned crystal is used as the reference. Electrical Specifications Parameter Conditions Minimum Typical Maximum Units ABSOLUTE MAXIMUM RATINGS (note 1) 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 20 seconds 260 °C Storage temperature -65 150 °C DC CHARACTERISTICS (at 5.0V unless otherwise noted)DC CHARACTERISTICS (at 5.0V unless otherwise noted)DC CHARACTERISTICS (at 5.0V unless otherwise noted) Operating Voltage, VDD 4.5 5.5 V Input High Voltage, VIH, input clock only Clock input 3.5 2.5 V Input Low Voltage, VIL, input clock only Clock input 2.5 1.5 V Output High Voltage, VOH 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 19 mA Operating Supply Current, IDD, 3.3V No Load 10 mA Input Capacitance 7 pF Actual Mean Frequency versus Target, note 3 With exact crystal 0 ppm AC CHARACTERISTICS Input Clock or Crystal Frequency 14.31818 MHz Input Crystal Accuracy 30 ppm Input Clock Duty Cycle, 14.31818MHz Time above 2.5V 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 45 50 55 % Absolute Clock Period Jitter, 14.318 MHz output -400 250 400 ps Absolute Clock Period Jitter, 20, 25 MHz outputs -300 150 300 ps One Sigma Clock Period Jitter All outputs 70 ps

Fast Ethernet Clock Source MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax ICR OCLOC K While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) 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. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments. Package Outline and Package Dimensions Inches Inches Millimeters Millimeters Symbol Min Max Min Max A 0.055 0.070 1.397 1.778 b 0.013 0.019 0.330 0.483 D 0.185 0.200 4.699 5.080 E 0.150 0.160 3.810 4.064 H 0.225 0.245 5.715 6.223 e .050 BSC .050 BSC 1.27 BSC 1.27 BSC h 0.015 0.381 Q 0.004 0.01 0.102 0.254 8 pin SOIC

Ordering Information

Part/Order Number Marking Package Temperature MK2014A MK2014A 8 pin SOIC 0 to 70 C MK2014ATR MK2014A Add tape and reel 0 to 70 C c A b D E H e h x 45° Q Pin 1