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.

Applications

* 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

* 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