• Select 1 of 4 differential inputs
• Provides two copies of the selected input
• Low power 260mW (VCC = 2.5V)
• DC-to- >2.5Gbps data rate throughput
• <410ps In-to-Q tpd
• <180ps tr/ tf times
• <10psPP total jitter (clock)
• <1psRMS random jitter
• <10psPP deterministic jitter
• <0.7psRMS crosstalk-induced jitter
• Unique, patent-pending input design minimizes crosstalk
• Accepts an input signal as low as 100mV
• Unique patented input termination and VT pin accepts DC- and AC-coupled inputs (CML, LVPECL, LVDS)
• 800mV 100K LVPECL output swing
• Power supply 2.5V ±5% or 3.3V ±10%
• -40°C to +85°C temperature range
• Available in 32-pin (5mm x 5mm) QFN package

The SY89855U is a 2.5V/3.3V precision, high-speed, 4:1 differential multiplexer with 100K LVPECL (800mV) compatible outputs, capable of handling clocks up to 2.5GHz and data streams up to 2.5Gbps. In addition, a 1:2 fanout buffer provides two copies of the selected inputs.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 100mV without any level shifting or termination resistor networks in the signal path. The result is a clean, stub-free, low-jitter interface solution. The outputs are 800mV LVPECL, (100K temperature compensated) with fast rise/fall times guaranteed to be less than 180ps.The SY89855U operates from a 2.5V ±5% supply or a 3.3V ±10% supply and is guaranteed over the full industrial temperature range of -40°C to +85°C. For applications that require higher performance, consider the SY58029U. The SY89855U is part of Micrel's highspeed, Precision Edge® product line.