• Selects between two inputs, and provides 5 precision LVPECL copies
• Prevents outputs from oscillating when input is invalid
• DC-to >1.5GHz throughput
• <900ps Propagation Delay (IN-to-Q)
• <250ps Rise/Fall times
• 150fsRMS phase jitter (typ.)
• <0.7psRMS MUX crosstalk induced jitter
• Unique, patented MUX input isolation design minimizes adjacent channel crosstalk
• Unique patented internal termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
• Wide input voltage range. VCC to GND
• 2.5V ±5% or 3.3 ±10% supply voltage
• -40°C to +85°C industrial temperature range
• Available in 32-pin (5mm x 5mm) QFN package

The SY89846U is a 2.5/3.3V, 1:5 LVPECL fanout buffer with a 2:1 differential input multiplexer (MUX). A unique Fail-Safe Input (FSI) protection prevents metastable output conditions when the selected input clock fails to a DC voltage (voltage between the pins of the differential input drops significantly below 100mV).The differential input includes Micrel's unique, 3-pin internal termination architecture that can 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 800mV, LVPECL with fast rise/fall times guaranteed to be less than 250ps.The SY89846U 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 SY89846U is part of Micrel's high-speed, Precision Edge® product line.