Zero-Delay Glitch-Free Clock Multiplexer
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ICS581-01, -02 Zero-Delay Glitch-Free Clock Multiplexer
Features
• Tiny 16 pin TSSOP package • No s...
Description
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ICS581-01, -02 Zero-Delay Glitch-Free Clock Multiplexer
Features
Tiny 16 pin TSSOP package No short pulses or glitches on output. Operates to 200 MHz User controlled (ICS581-01) or automatic, timed (ICS581-02) switch Low skew outputs Ideal for systems with backup or redundant clocks Zero delay, input to output 50% output duty cycle allows duty cycle correction Spread Smart™ technology works with spread spectrum parts
CLK1 1 0 SELA FBIN OE0 OE1 PLL 2 S0, S1 CLK4 OE1 CLK3
OE0
Description
The ICS581-01 and ICS581-02 are glitch free, Phase Locked Loop (PLL) based clock multiplexers (mux) with zero delay from input to output. They each have 4 low skew outputs which can be configured as a single output, 3 outputs or 4 outputs. The ICS581-01 allows user control over the mux switching. The ICS581-02 has automatic switching between the 2 clock inputs. The ICS581-01 and -02 are members of the ICS Clock Blocks™ family of clock generation, synchronization, and distribution devices. For a non-PLL based clock mux, see the ICS580-01.
Block Diagrams
INA INB
CLK2
ICS581-01 External Feedback
IN ÷48 ÷3
NO_INA Transition Detector
1 0 DIV
CLK1 OE0 CLK2 PLL CLK3
INA INB FBIN
1 0
ICS581-02
OE0 OE1
2 S0, S1 CLK4 OE1
External Feedback 1 Revision 041100 Printed 11/14/00 Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126 (408) 295-9800tel www.icst.com
MDS 581-01, 581-02 A
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ICS581-01, -02 Zero-Delay Glitch-Fre...
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