ICS580-01
Glitch-Free Clock Multiplexer
Description
The ICS580-01 is a clock multiplexer (mux)
designed to switch between 2 clock sources with no
glitches or short pulses. The operation of the mux is
controlled by an input pin but the part can also be
configured to switch automatically if one of the
input clocks stops. The part also provides clock
detection by reporting when an input clock has
stopped.
For a clock mux with zero delay and smooth
switching, see either the ICS581-01 or ICS581-02.
Features
鈥?Packaged in 16 pin narrow (150 mil) SOIC
鈥?No short pulses or glitches on output
鈥?Operates to 200 MHz
鈥?Does not add jitter or phase noise to the clock
鈥?User controlled or automatic switching
鈥?Low skew outputs
鈥?Clock detect feature
鈥?Ideal for systems with backup or redundant clocks
鈥?Selectable timeouts for clock detection
鈥?Separate supply voltages allow power supply voltage
translation
鈥?Operates to 2.5 V
Block Diagram
VDDI
VDDC
CLK1
INB
INA
SELB
OE2
1
OE1
0
CLK2
Transition
Detector
OE3
NO_INA
Transition
Detector
OE4
NO_INB
DIV
Timer
1
Revision 030300
Printed 11/28/00
Integrated Circuit Systems, Inc. 鈥?525 Race Street 鈥?San Jose 鈥A鈥?5126鈥?(408) 295-9800tel 鈥?www.icst.com
MDS 580-01 A