MAX4890/MAX4891/MAX4892 19-3577 Rev 2 8/07 10/100/1000 Base-T Ethernet LAN Switch General Description Features The MAX4890/MAX4891/MAX4892 high-speed analog Single +3.0V to +3.6V Power-Supply Voltage switches meet the needs of 10/100/1000 Base-T appli- Low On-Resistance (R ): 4 (typ), 6.5 (max) ON cations. These devices switch the signals from two Ultra-Low On-Capacitance (C ): 6.5pF (typ) ON interface transformers and connect the signals to a sin- gle 10/100/1000 Base-T Ethernet PHY, simplifying Low < 200ps Bit-to-Bit Skew docking station design and reducing manufacturing -3dB Bandwidth: 1GHz costs. The MAX4890/MAX4891/MAX4892 can also Optimized Pin-Out for Easy Transformer and PHY route signals from a common interface transformer to Interface two different boards in board-redundancy applications. Built-In LED Switches for Switching Indicators to The MAX4890/MAX4891/MAX4892 switches provide an extremely low capacitance and on-resistance to meet Docking Station Ethernet insertion and return-loss specifications. The Low 450A (max) Quiescent Current MAX4891/MAX4892 feature one and three built-in LED Bidirectional 8 to 16 Multiplexer/Demultiplexer switches, respectively. Space-Saving Packages The MAX4890/MAX4891/MAX4892 are available in 32-Pin, 5mm x 5mm, TQFN Package space-saving 32- and 36-lead TQFN packages, 36-Pin, 6mm x 6mm, TQFN Package significantly reducing the required PC board area. These devices operate over the -40C to +85C tem- perature range. Ordering Information Applications PART PIN-PACKAGE LED SWITCHES Notebooks and Docking Stations MAX4890ETJ 32 TQFN-EP* Servers and Routers with Ethernet Interfaces MAX4891ETJ 32 TQFN-EP* 1 Board-Level Redundancy Protection MAX4892ETX 36 TQFN-EP* 3 SONET/SDH Signal Routing Note: All devices are specified for operation in the -40C to +85C temperature range. T3/E3 Redundancy Protection *EP = Exposed pad. Video Switching Pin Configurations TOP VIEW 32 31 30 29 28 27 26 25 A2 1 24 2B1 A3 2 23 3B1 N.C. 3 22 2B2 N.C. 4 21 3B2 MAX4890 N.C. 5 20 4B1 6 19 N.C. 5B1 A4 7 18 4B2 *EP A5 8 17 5B2 9 101112131415 16 TQFN Functional Diagrams and Typical Operating Circuit appear *EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED at end of data sheet. Pin Configurations continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. A6 A1 A7 A0 GND V+ N.C. SEL 7B2 0B1 6B2 1B1 7B1 0B2 6B1 1B210/100/1000 Base-T Ethernet LAN Switch ABSOLUTE MAXIMUM RATINGS V+.............................................................................-0.3V to +4V Continuous Power Dissipation (T = +70C) A SEL (Note 1) ..................................................-0.3V to (V+ +0.3V) 32-Pin TQFN (derate 34.5mW/C above +70C) ...........2.76W A , B , LED , LED ...................................-0.3V to (V+ +0.3V) 36-Pin TQFN (derate 26.3mW/C above +70C) ...........2.11W Continuous Current (A to B )......................................120mA Operating Temperature Range ...........................-40C to +85C Continuous Current (LED to LED ) ...............................30mA Junction Temperature......................................................+150C Peak Current (A to B ) Storage Temperature Range .............................-65C to +150C (pulsed at 1ms, 10% duty cycle)................................240mA Lead Temperature (soldering, 10s) .................................+300C Note 1: Signals on SEL, exceeding V+ or GND, are clamped by internal diodes. Limit forward-diode current to maximum current rating. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V+ = +3V to +3.6V, T = T to T , unless otherwise noted. Typical values are at V+ = 3.3V, T = +25C.) (Note 2) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ANALOG SWITCH V+ = 3V, T = +25C 4 5.5 A On-Resistance R I = -40mA, ON A T to T 6.5 1.5V V V+ MIN MAX A On-Resistance V+ = 3V, I = -40mA, 1.5V V V+, LED A R 40 ONLED LED Switches MAX4891/MAX4892 V+ = 3V, T = +25C 0.5 1.5 A On-Resistance Match I = -40mA, A R ON Between Channels 1.5V V V+ A T to T 2 MIN MAX (Note 3) On-Resistance Flatness R V+ = 3V, I = -40mA, V = 1.5V, 2.7V 0.01 FLAT(ON) A A V+ = 3.6V, V = 0.3V, 3.3V A Off-Leakage Current I -1 +1 LA (OFF) V or V = 3.3V, 0.3V B1 B2 A V+ = 3.6V, V = 0.3V, 3.3V A On-Leakage Current I -1 +1 LA (ON) V or V = 0.3V, 3.3V or floating B1 B2 ESD PROTECTION ESD Protection Human Body Model 2 kV SWITCH AC PERFORMANCE Insertion loss with typical transformer, Insertion Loss I R = 100, 1MHz < f < 100MHz, Figure 1 0.6 dB LOS L (Note 3) Return loss with R 1MHz < f < 40MHz -19 LOS1 typical transformer, Return Loss R = 100, return dB L -13 loss, f in MHz, R 40MHz < f < 100MHz +20log LOS2 Figure 2 (Note 3) (f/80) 2 MAX4890/MAX4891/MAX4892