MK2014A

I C R O C LOC K Description 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. MK2014A Fast Ethernet Clock Source 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 Block Diagram VDD GND 2 Clock Synthesis and Control Circuitry Output Buffer Output Buffer Output Buffer 20 MHz 25 MHz 14.31818 MHz crystal or clock X1 Crystal Oscillator X2 14.318 MHz 1 Revision 121598 Printed 11/15/00 MicroClock Division of ICS 525 Race Street San Jose CA 95126(...