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New MUX from Micrel prevents runt pulses during switchover

Posted: 09 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:sy89844u? micrel semiconductor? multiplexer? mux? runt pulse eliminator?

The SY89844U from Micrel Semiconductor Inc. is a low jitter LVDS, 2:1 input multiplexer (MUX) designed for redundant source switchover applications. Unlike standard multiplexers, this 2:1 Runt Pulse Eliminator (rpe) MUX prevents any short cycles or "runt" pulses during switchover, said the company. Additionally, its 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 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 outputs are 325mV LVDS with fast rise/fall times guaranteed to be less than 150ps.

Part of Micrel's high-speed, Precision Edge product line, the SY89844U operates from a 2.5V 5 percent supply and is guaranteed over the full industrial temperature range of -40C to 85C. It has an operating frequency of 1kHz to >1.5GHz.

The SY89844U is housed in a 24-pin, 4-by-4mm MLF package.

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