SY89464U Datasheet | Micrel Semiconductor

Precision LVPECL 1:10 Fanout with 2:1 Runt Pulse Eliminator MUX and Internal Termination General Description The SY89464U is a low jitter 1:10 LVPECL fanout buffer with a 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89464U’s unique 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or “runt” pulses during switchover. In addition, 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 below 100m V). The differential input includes Micrel’s unique, 3-pin internal termination architecture that allows customers to interface to any differential signal (ACor DC-coupled) as small as 100m V (200m VPP) without any level shifting or termination resistor networks in the signal path. The outputs are 800m V, 100K-patible LVPECL with fast rise/fall times guaranteed to be less than 220ps. The SY89464U 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 SY89464U is part of Micrel’s high-speed, Precision Edge® product line. All support documentation can be found on Micrel’s web site at: .micrel.. United States Patent No. RE44,134 Precision Edge is a registered trademark of Micrel, Inc. Features Precision Edge® - Selects between two sources, and provides 10 precision LVPECL copies - Guaranteed AC performance over temperature and supply voltage: - Wide operating frequency: 1k Hz to >1.5GHz - < 1100ps In-to-Out tpd - < 220ps tr/tf - Unique, patent-pending MUX input isolation design minimizes adjacent channel crosstalk - Fail-Safe Input prevents oscillations - Ultra-low jitter design: - <1ps RMS random jitter - <1ps RMS cycle-to-cycle jitter - <10ps PP total jitter (clock) - <0.7ps RMS MUX crosstalk induced jitter - Unique patented internal termination and VT pin...