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Micrel MUX prevents short cycles

Posted: 08 Apr 2005 ?? ?Print Version ?Bookmark and Share


The SY89840U from Micrel Semiconductor is a low jitter PECL, 2:1 differential input multiplexer (MUX) designed for redundant source switchover applications. Unlike standard multiplexers, this device prevents any short cycles or "runt" pulses during switchover. Additionally, Micrel said, the unique Fail-Safe Input protection prevents metastable conditions when the selected input clock fails to a DC voltage.

The differential input includes the company's 3-pin input termination architecture that allows customers to interface to any differential signal (AC or DC-coupled) as small as 100mV (200mVpp) without any level shifting or termination resistor networks in the signal path. The output is 800mV, 100K compatible LVPECL with fast rise/fall times guaranteed to be less than 190ps.

With an operating frequency of 1kHz to >1.5GHz, the new 2:1 Runt Pulse Eliminator (RPE) MUX operates from a 2.5V 5 percent or 3.3V 10 percent supply and is guaranteed over the full industrial temperature range of -40C to 85C.

The SY89840U is available in a 16-pin, 3-by-3mm MLF package.

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