MK2014A

Fast Ethernet Clock Source

MDS 2014A B

1

Revision 121598

Printed 11/15/00

MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel•(408)295-9818fax

I C R O

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

X1

X2

14.31818 MHz

crystal or clock

Output

Buffer

25 MHz

2