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MAX4891 Dataheets PDF



Part Number MAX4891
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description 10/100/1000 Base-T Ethernet LAN Switch
Datasheet MAX4891 DatasheetMAX4891 Datasheet (PDF)

19-3577; Rev 1; 8/05 10/100/1000 Base-T Ethernet LAN Switch General Description www.datasheet4u.com 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 MAX4890/MAX4891/MAX4892 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 .

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19-3577; Rev 1; 8/05 10/100/1000 Base-T Ethernet LAN Switch General Description www.datasheet4u.com 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 MAX4890/MAX4891/MAX4892 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. ♦ 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 Applications Notebooks and Docking Stations Servers and Routers with Ethernet Interfaces Board-Level Redundancy Protection SONET/SDH Signal Routing T3/E3 Redundancy Protection Video Switching PART MAX4890ETJ MAX4891ETJ MAX4892ETX Ordering Information PINPACKAGE 32 TQFN 32 TQFN 36 TQFN LED SWITCHES — 1 3 PKG CODE T-3255-4 T-3255-4 T-3666-3 All devices are available in the -40°C to +85°C operation temperature range. Pin Configurations 1B1 SEL 0B1 0B2 1B2 A0 A1 V+ TOP VIEW 32 A2 A3 N.C. N.C. N.C. N.C. A4 A5 31 30 29 28 27 26 25 24 23 22 21 2B1 3B1 2B2 3B2 4B1 5B1 4B2 5B2 1 2 3 4 5 6 7 8 9 A6 MAX4890* 20 19 18 17 10 A7 11 GND 12 N.C. 13 7B2 14 6B2 15 7B1 16 6B1 Typical Operating Circuit appears at end of data sheet. TQFN 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 Maxim’s website at www.maxim-ic.com. 10/100/1000 Base-T Ethernet LAN Switch MAX4890/MAX4891/MAX4892 ABSOLUTE MAXIMUM RATINGS SEL (Note 1) ………………………………….. -0.3V to (V+ +0.3V) A_, _B_, LED_, _LED_ .……………………… -0.3V to (V+ +0.3V) Continuous Current (A_ to _B_) ......................................±120mA Continuous Current (LED_ to _LED_) .…………………… ±30mA Peak Current (A_ to _B_) (pulsed at 1ms, 10% duty cycle) ……………………. ±240mA Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN (derate 34.5mW/°C above +70°C) …….. 2.76W 36-Pin TQFN (derate 26.3mW/°C above +70°C) …….. 2.11W Operating Temperature Range …………………. -40°C to +85°C Junction Temperature.……………………………………. +150°C Storage Temperature Range .…………………. -65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C www.datasheet4u.com V+ ……………………………………………………… -0.3V to +4V 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, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 2) PARAMETER ANALOG SWITCH On-Resistance On-Resistance LED Switches On-Resistance Match Between Channels On-Resistance Flatness Off-Leakage Current On-Leakage Current ESD PROTECTION ESD Protection SWITCH AC PERFORMANCE Insertion Loss ILOS Insertion loss with typical transformer, RL = 100Ω, 1MHz < f < 100MHz, Figure 1 (Note 3) Return loss with typical transformer, RL = 100Ω, return loss, f in MHz, Figure 2 (Note 3) 1MHz < f < 40MHz 0.6 dB Human Body Model ±2 kV RON V+ = 3V, IA_ = -40mA, 1.5V ≤ VA_ ≤ V+ TA = +25°C TMIN to TMAX 4 5.5 Ω 6.5 40 0.5 1.5 Ω TMIN to TMAX 0.01 -1 -1 +1 µA ILA_(ON) V+ = 3.6V, VA_= 0.3V, 3.3V V_B1 or V_B2 = 0.3V, 3.3V or floating +1 2 Ω Ω SYMBOL CONDITIONS MIN TYP MAX UNITS RONLED V+ = 3V, I_LED_ = -40mA, 1.5V ≤ VA_ ≤ V+, MAX4891/MAX4892 V+ = 3V, IA_= -40mA, 1.5V ≤ VA_ ≤ V+ (Note 3) TA = +25°C ∆RON RFLAT(ON) ILA_(OFF) V+ = 3V, IA_ = -40mA, VA_ = 1.5V, 2.7V V+ = 3.6V, VA_ = 0.3V, 3.3V V_B1 or V_B2 =.


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