SY89845U Precision CML Runt Pulse Eliminator 2:1 MUX with 1:2 Fanout and Internal Termination General Description The SY89845U is a low jitter CML, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications.
Unlike standard multiplexers, the SY89845U unique 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or “runt” pulses during switchover.
In addition, a unique Fail-Safe Input protection prevents metastable conditions when the selected input clock fails to a DC voltage (voltage between the pins of the differential input drops below 100mV).
The differential input includes Micrel’s unique, 3-pin input termination architecture that allows cust...

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