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MK2042-01

Communications Clock Monitor

Integrated Circuit Systems 

ADVANCE INFORMATION

MK2042-01

I CR O C LOC K

Communications Clock Monitor

Description

The MK2042-01 is designed to switch between

two clock sources. The switching can be externally

controlled by an input pin or configured to switch

automatically if the primary input clock stops.

The part also provides clock detection by reporting

when the primary input clock has stopped.

The MK2042-01 is optimized for use with our

MK2049 family of Communication Clock

Synthesizers. When used together, the

MK2042-01 and MK2049 provide a complete

system for switching to an alternate source when

the primary clock is lost, or for maintaining a

stable frequency on the MK2049 output.

For switching between clock sources with no

output glitches or short pulses, use the ICS580 or

ICS581 multiplexers.

Features

• Packaged in 16 pin SOIC

• User controlled or automatic switching

• Clock detect feature

• Does not add jitter or phase noise to the clock

• Ideal for systems with backup or redundant clocks

• Selectable timeouts for clock loss detection

• Accepts input frequencies from 0 Hz to 160 MHz

• Works with all MK2049-xx to provide enhanced

operation

• 3.3 V or 5 V operation

Block Diagram

VDD GND

SELB

OE

INB

INA

REFIN

S2:S0

3

CENTER

Clock Loss

Detector

VDD

CLKOUT

NO_INA

HIGH

GND

LOW

MDS 2042-01

1

Revision 102600

Printed 11/15/00

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

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