MK2042-01 Datasheet, PDF (1/6 Pages) Integrated Circuit Systems – Communications Clock Monitor

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 • [phone]tel• www.icst.com