MK2011

Fast Ethernet Clock Source

MDS 2011 B

1

Revision 120597

Printed 11/15/00

MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax

I C R O

The MK2011 is the ideal way to generate clocks

for Fast Ethernet cards or systems. It provides

20MHz, 25MHz, and 50MHz clocks. In an 8 pin

SOIC, the MK2011 can save component count,

board space, and cost over surface mount crystals

and oscillators, and increase reliability by

eliminating two or three mechanical devices from

the board.

MicroClock offers many other clocks for

computers and computer peripherals. Consult

MicroClock 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 20.00 MHz

• Lowest jitter in the industry reliably clocks

sensitive Ethernet devices.

• Output clock frequencies of 20.00 MHz,

25.00 MHz, and 50.00 MHz

• 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

PLL

Clock Synthesis

Circuitry

Output

Buffer

Output

Buffer

50 MHz

20 MHz

X1

X2

20.00 MHz

xtal or clock

Output

Buffer

25 MHz