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MAX4891：10/100/1000 Base-T Ethernet LAN Switch

The MAX4890/MAX4891/MAX4892 high-speed analog switches meet the needs of 10/100/1000 Base-T applications. These devices switch the signals from two interface transformers and connect the signals to a single 10/100/1000 Base-T Ethernet PHY, simplifying docking station design and reducing manufacturing costs. The MAX4890/MAX4891/MAX4892 can also route signals from a common interface transformer to two different boards in board-redundancy applications. The MAX4890/MAX4891/MAX4892 switches provide an extremely low capacitance and on-resistance to meet Ethernet insertion and return-loss specifications. The MAX4891/MAX4892 feature one and three built-in LED switches, respectively. The MAX4890/MAX4891/MAX4892 are available in space-saving 32- and 36-lead TQFN packages, significantly reducing the required PC board area. These devices operate over the -40°C to +85°C temperature range.

Key Features Single +3.0V to +3.6V Power-Supply Voltage Low On-Resistance (RON): 4Ω (typ), 6.5Ω (max) Ultra-Low On-Capacitance (CON): 6.5pF (typ) Low < 200ps Bit-to-Bit Skew -3dB Bandwidth: 1GHz Optimized Pin-Out for Easy Transformer and PHY Interface Built-In LED Switches for Switching Indicators to Docking Station Low 450µA (max) Quiescent Current Bidirectional 8 to 16 Multiplexer/Demultiplexer Space-Saving Packages 32-Pin, 5mm x 5mm, TQFN Package 36-Pin, 6mm x 6mm, TQFN Package

MAX4890, MAX4891, MAX4892: Typical Operating Circuit Applications/Uses Board-Level Redundancy Protection Notebooks and Docking Stations Servers and Routers with Ethernet Interfaces SONET/SDH Signal Routing T3/E3 Redundancy Protection Video Routing and Switching Systems

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