SY89843U Datasheet | Micrel Semiconductor

Precision LVPECL Runt Pulse Eliminator 2:1 MUX with 1:2 Fanout and Internal Termination General Description The SY89843U is a low jitter PECL, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89843U 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 100m V). The differential input includes Micrel’s unique, 3-pin input termination architecture that allows customers to interface to any differential signal (AC- or DC-coupled) as small as 100m V (200m VPP) without any level shifting or termination resistor networks in the signal path. The output is 800m V, 100K patible LVPECL with fast rise/fall times guaranteed to be less than 190ps. The SY89843U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of - 40°C to +85°C. The SY89843U is part of Micrel’s high-speed, Precision Edge® product line. All support documentation can be found on Micrel’s web site at: .micrel.. Features Precision Edge ® - Selects between two sources, and provides a glitch-free, stable LVPECL output - Guaranteed AC performance over temperature and supply voltage: - - Wide operating frequency: 1k Hz to >1.5GHz - - < 880ps In-to-Out tpd - - < 190ps tr/tf - Unique patent-pending input isolation design minimizes crosstalk - Fail-Safe Input prevents oscillations - Ultra-low jitter design: - 65fs RMS phase jitter (Type) - 0.7ps RMS MUX crosstalk induced jitter - Unique patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS) - 800m V LVPECL output swing - 2.5V ±5% or 3.3V ±10% supply voltage - - 40°C to +85°C industrial temperature range - Available in 24-pin (4mm x 4mm)...