19-0624; Rev 0; 8/06 1000 Base-T, ±15kV ESD Protection LAN Switches The MAX4890E/MAX4892E meet the needs of high-speed differential switching. The devices handle the needs of Gigabit Ethernet (10/100/1000) Base-T switching as well as LVDS and LVPECL switching. The MAX4890E/ MAX4892E provide enhanced ESD protection up to ±15kV, and excellent high-frequency response, making the devices especially useful for interfaces that must go to an outside connection. Both devices provide extremely low capacitance (CON), as well as low resistance (RON), for low-insertion loss and very wide bandwidth. In addition to the four pairs of DPDT switches, the MAX4892E provides LED switching for laptop computer/docking station use. The MAX4890E/MAX4892E are pin-for-pin equivalents to the MAX4890/MAX4892 and can replace these devices for those applications requiring the enhanced ESD protection. Both devices are available in spacesaving TQFN packages and operate over the standard -40°C to +85°C temperature range. Applications Notebooks and Docking Stations Servers and Routers with Ethernet Interfaces Board-Level Redundancy Protection SONET/SDH Signal Routing T3/E3 Redundancy Protection LVDS and LVPECL Switching 1B2 20 SEL 2B1 3B1 2B2 3B2 4B1 5B1 4B2 19 5B2 1 27 2 26 A3 LED0 0LED1 0LED2 3 25 4 24 A4 A5 A6 7 23 MAX4892E 6 22 21 8 *EP 16 17 18 7B1 6B1 15 14 11 13 10 A7 GND LED1 1LED1 1LED2 7B2 6B2 9 12 ♦ Ultra-Low On-Capacitance (CON): 8pF (typ) ♦ -23dB Return Loss (100MHz) ♦ -3dB Bandwidth: 650MHz ♦ Optimized Pin Out for Easy Transformer and PHY Interface ♦ Built-In LED Switches for Switching Indicators to Docking Station (MAX4892E) ♦ Low 450µA (max) Quiescent Current ♦ Bidirectional 8 to 16 Multiplexer/Demultiplexer ♦ Standard Pin Out, Matching the MAX4890 and MAX4892 ♦ Space-Saving Lead-Free Packages 32-Pin, 5mm x 5mm, TQFN Package 36-Pin, 6mm x 6mm, TQFN Package Ordering Information PART PINPACKAGE LED SWITCHES PKG CODE MAX4890EETJ+ 32 TQFN-EP* — T-3255-4 MAX4892EETX+ 36 TQFN-EP* 3 T-3666-3 +Denotes lead-free package. Note: All devices are specified over the -40°C to +85°C operating temperature range. *EP = Exposed pad. Eye Diagram A1 A2 5 ♦ ±15kV ESD Protected Per MIL-STD-883, Method 3015 ♦ Single +3.0V to +3.6V Power-Supply Voltage ♦ Low On-Resistance (RON): 4Ω (typ), 6.5Ω (max) 28 29 0B1 1B1 0B2 30 31 32 33 34 A0 36 + 35 TOP VIEW V+ LED2 2LED1 2LED2 Pin Configurations Features CH2: 4B2, 100mV/div CH1: 5B2, 100mV/div f = 125MHz TQFN *EXPOSED PAD CONNECTED TO GND. Pin Configurations continued at end of data sheet. Typical Operating Circuit and Functional Diagrams appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX4890E/MAX4892E General Description MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches ABSOLUTE MAXIMUM RATINGS V+ ……………………………………………………… -0.3V to +4V All Other Pins………………………………….. -0.3V to (V+ + 0.3V) Continuous Current (A_ to _B_) ......................................±120mA Continuous Current (LED_ to _LED_) .…………………… ±40mA Peak Current (A_ to _B_) (pulsed at 1ms, 10% duty cycle) ……………………. ±240mA Current into Any Other Pin................................................±20mA Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN (derate 34.5mW/°C above +70°C) …….. 2.76W 36-Pin TQFN (derate 35.7mW/°C above +70°C) …….. 2.85W ESD Protection, Human Body Model .............................±15kV 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 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 = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 4 5.5 UNITS ANALOG SWITCH On-Resistance On-Resistance LED Switches On-Resistance Match Between Channels On-Resistance Flatness Off-Leakage Current RON RONLED ∆RON RFLAT(ON) V+ = 3V, IA_ = -40mA, VA_ = 0, 1.5V, 3V TA = +25°C Ω TMIN to TMAX 6.5 V+ = 3V, I_LED_ = -40mA, VLED_ = 0, 1.5V, 3V (MAX4892E) V+ = 3V, IA_= -40mA, VA_ = 0, 1.5V, 3V (Note 2) 40 TA = +25°C 0.5 Ω 1.5 Ω TMIN to TMAX 2 V+ = 3V, IA_ = -40mA, VA_ = 1.5V, 3V ILA_(OFF) V+ = 3.6V, VA_ = 0.3V, 3.3V; V_B1 or V_B2 = 3.3V, 0.3V ILA_(ON) V+ = 3.6V, VA_= 0.3V, 3.3V; V_B1 or V_B2 = 0.3V, 3.3V or floating Ω 0.01 -1 +1 µA On-Leakage Current -1 +1 ESD PROTECTION ESD Protection Human Body Model (spec MIL-STD-883, Method 3015) ±15 kV SWITCH AC PERFORMANCE Insertion Loss ILOS RS = RL = 50Ω, unbalanced, f = 1MHz, (Note 2) 0.6 dB Return Loss RLOS f = 100MHz -23 dB 2 _______________________________________________________________________________________ 1000 Base-T ±15kV ESD Protection LAN Switch MAX4890E/MAX4892E ELECTRICAL CHARACTERISTICS (continued) (V+ = +3V to +3.6V, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL VCT1 Crosstalk VCT2 CONDITIONS Any switch to any switch; RS = RL = 50Ω, unbalanced, Figure 1 MIN TYP f = 25MHz -50 f = 125MHz -26 MAX UNITS dB SWITCH AC CHARACTERISTIC -3dB Bandwidth BW Off-Capacitance On-Capacitance Turn-On Time Turn-Off Time Propagation Delay Output Skew Between Ports RS = RL = 50Ω, unbalanced 650 MHz COFF f = 1MHz, _B_, A_ 3.5 pF CON f = 1MHz, _B_, A_ 6.5 tON VA_ = 1V, RL, 100Ω, Figure 2 tOFF VA_ = 1V, RL, 100Ω, Figure 2 pF 50 50 ns ns tPLH, tPHL RS = RL = 50Ω, unbalanced, Figure 3 0.1 ns tSK(o) Skew between any two ports, Figure 4 0.01 ns SWITCH LOGIC Input-Voltage Low VIL V+ = 3.0V Input-Voltage High VIH V+ = 3.6V Input-Logic Hysteresis VHYST V+ = 3.3V Input Leakage Current ISEL Operating Supply-Voltage Range V+ Quiescent Supply Current I+ V+ = 3.6V, VSEL = 0 or V+ V+ = 3.6V, VSEL = 0 or V+ 0.8 2.0 100 V mV -5 +5 µA 3.0 3.6 V 450 µA 280 Note 1: Specifications at -40°C are guaranteed by design. Note 2: Guaranteed by design. _______________________________________________________________________________________ 3 Typical Operating Characteristics (V+ = 3.3V, TA = +25°C, unless otherwise noted.) LED_ON-RESISTANCE vs. VLED_ 5 22 TA = +85°C 20 LEAKAGE CURRENT vs. TEMPERATURE 40 MAX4890E toc02 MAX4890E toc01 24 36 32 RONLED (Ω) TA = +85°C 3 TA = -40°C 14 12 2 10 8 1 6 4 TA = +25°C LEAKAGE CURRENT (pA) 18 16 4 TA = +25°C TA = -40°C 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 16 12 ILA_(OFF) -40 3.0 35 300 280 260 240 MAX4890E toc05 0 -1 INSERTION LOSS (dB) 320 10 TEMPERATURE (°C) SINGLE-ENDED INSERTION LOSS vs. FREQUENCY MAX4890E toc04 V+ = 3.6V 340 ILA_(ON) -15 VLED_ (V) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE QUIESCENT SUPPLY CURRENT (µA) 20 0 0 VA_ (V) -2 -3 -4 -5 -6 220 -7 200 -8 -40 -15 10 35 TEMPERATURE (°C) 4 24 4 0 0 28 8 2 0 MAX4890E toc03 ON-RESISTANCE vs. VA_ 6 RON (Ω) MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches 60 85 1 10 100 1000 FREQUENCY (MHz) _______________________________________________________________________________________ 60 85 1000 Base-T ±15kV ESD Protection LAN Switch PIN NAME FUNCTION MAX4892E MAX4890E 1 32 A1 Differential PHY Interface Pair. Connect to the Ethernet PHY. 2 1 A2 Differential PHY Interface Pair. Connect to the Ethernet PHY. 3 2 A3 Differential PHY Interface Pair. Connect to the Ethernet PHY. 4 — LED0 LED0 Input 5 — 0LED1 0LED1 Output. Drive SEL low (SEL = 0) to connect LED0 to 0LED1. 6 — 0LED2 7 7 A4 Differential PHY Interface Pair. Connect to the Ethernet PHY. 8 8 A5 Differential PHY Interface Pair. Connect to the Ethernet PHY. 9 9 A6 Differential PHY Interface Pair. Connect to the Ethernet PHY. 10 10 A7 Differential PHY Interface Pair. Connect to the Ethernet PHY. 11 11 GND Ground 12 — LED1 LED1 Input 13 — 1LED1 1LED1 Output. Drive SEL low (SEL = 0) to connect LED1 to 1LED1. 14 — 1LED2 15 13 7B2 B2 Differential Pair 16 14 6B2 B2 Differential Pair 17 15 7B1 B1 Differential Pair 18 16 6B1 B1 Differential Pair 19 17 5B2 B2 Differential Pair 20 18 4B2 B2 Differential Pair 21 19 5B1 B1 Differential Pair 22 20 4B1 B1 Differential Pair 23 21 3B2 B2 Differential Pair 24 22 2B2 B2 Differential Pair 25 23 3B1 B1 Differential Pair 26 24 2B1 B1 Differential Pair 27 29 SEL Select Input. SEL selects switch connection. See the Truth Table (Table1). 28 25 1B2 B2 Differential Pair 29 26 0B2 B2 Differential Pair 30 27 1B1 B1 Differential Pair 31 28 0B1 B1 Differential Pair 32 — 2LED2 2LED2 Output. Drive SEL high (SEL = 1) to connect LED2 to 2LED2. 33 — 2LED1 2LED1 Output. Drive SEL low (SEL = 0) to connect LED2 to 2LED1. 34 — LED2 35 30 V+ Positive-Supply Voltage Input. Bypass to GND with a 0.1µF ceramic capacitor. 36 31 A0 Differential PHY Interface Pair. Connect to the Ethernet PHY. — 3-6, 12 N.C. — — EP 0LED2 Output. Drive SEL high (SEL = 1) to connect LED0 to 0LED2. 1LED2 Output. Drive SEL high (SEL = 1) to connect LED1 to 1LED2. LED2 Input No Connection. Not internally connected. Exposed Pad. Connect exposed pad to GND or leave it unconnected. _______________________________________________________________________________________ 5 MAX4890E/MAX4892E Pin Description MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches MAX4892E SINGLE-ENDED BANDWIDTH NETWORK ANALYZER 50Ω TRACE SINGLE-ENDED CROSSTALK NETWORK ANALYZER NETWORK ANALYZER 50Ω TRACE A2 2 50Ω TRACE NETWORK ANALYZER 2B1 26 R13 49.9Ω 50Ω TRACE A3 3 3B1 25 R14 49.9Ω SINGLE-ENDED OFF-ISOLATION NETWORK ANALYZER 36 TQFN 0B1 31 A0 36 50Ω TRACE A4 7 4B1 22 50Ω TRACE NETWORK ANALYZER R15 49.9Ω Figure 1. Single-Ended Bandwidth, Crosstalk, and Off-Isolation Detailed Description The MAX4890E/MAX4892E are high-speed analog switches targeted for 1000 Base-T applications. In a typical application, the MAX4890E/MAX4892E switch the signals from two separate interface transformers and connect the signals to a single 1000 Base-T Ethernet PHY (see the Typical Operating Circuit). This configuration simplifies docking station design by avoiding signal reflections associated with unterminated transmission lines in a T configuration. The MAX4890E/MAX4892E are protected against ±15kV electrostatic discharge (ESD) shocks. The MAX4892E also includes LED switches that allow the LED output signals to be routed to a docking station along with the Ethernet signals. See the Functional Diagrams. With their low resistance and capacitance, as well as high ESD protection, the MAX4890E/MAX4892E can be used to switch most low-voltage differential signals, 6 such as LVDS, SEREDES, and LVPECL, as long as the signals do not exceed maximum ratings of the devices. The MAX4890E/MAX4892E switches provide an extremely low capacitance and on-resistance to meet Ethernet insertion and return-loss specifications. The MAX4892E features three built-in LED switches. The MAX4890E/MAX4892E incorporate a unique architecture design utilizing only n-channel switches within the main Ethernet switch, reducing I/O capacitance and channel resistance. An internal two-stage charge pump with a nominal output of 7.5V provides the high voltage needed to drive the gates of the n-channel switches while maintaining a consistently low RON throughout the input signal range. An internal bandgap reference set to 1.23V and an internal oscillator running at 2.5MHz provide proper charge-pump operation. Unlike other charge-pump circuits, the MAX4890E/MAX4892E include internal flyback capacitors, reducing design time, board space, and cost. _______________________________________________________________________________________ 1000 Base-T, ±15kV ESD Protection LAN Switches SEL CONNECTION 0 A_ to _B1, LED_ to _LED1 1 A_ to _B2, LED_ to _LED2 Digital Control Inputs The MAX4890E/MAX4892E provide a single digital control SEL. SEL controls the switches as well as the LED switches as shown in Table 1. Analog Signal Levels The on-resistance of the MAX4890E/MAX4892E is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics). The switches are bidirectional, allowing A_ and _B_ to be configured as either inputs or outputs. ESD Protection The MAX4890E/MAX4892E are characterized using the Human Body Model for ±15kV of ESD protection. Figure 5 shows the Human Body Model. This model consists of a 100pF capacitor charged to the ESD voltage of interest which is then discharged into the test device through a 1.5kΩ resistor. All signal and control pins are ESD protected to ±15kV HBM (Human Body Model). Typical Operating Circuit The Typical Operating Circuit shows the MAX4890E/ MAX4892E in a 1000 Base-T docking station application. Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum ratings. Stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited. Layout High-speed switches require proper layout and design procedures for optimum performance. Keep design-controlled-impedance pc board traces as short as possible. Ensure that bypass capacitors are as close as possible to the device. Use large ground planes where possible. Chip Information PROCESS: BiCMOS _______________________________________________________________________________________ 7 MAX4890E/MAX4892E Applications Information Table 1. Truth Table MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches SEL VIH 3.0V 50% 50% 2.0V VIL A_ 1.0V _B1 tON 50% tPHL tPLH 50% tOFF VH 0V 2.0V tON tOFF _B2 50% _B_ VL 50% PULSE SKEW = tSK(p) = |tPHL - tPLH| THE MAX4890E/MAX4892E SWITCHES ARE FULLY BIDIRECTIONAL. 0V Figure 2. Turn-On and Turn-Off Times Figure 3. Propagation Delay Times 3.0V 2.0V A_ 1.0V tPLHX RC 1MΩ tPHLX CHARGE-CURRENT LIMIT RESISTOR VOH 2.0V _B_ tPLHY HIGHVOLTAGE DC SOURCE VOL Cs 100pF RD 1500Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST tPHLY VOH 2.0V _B_ VOL OUTPUT SKEW = tSK(O) = |tPLHY - tPLHX| OR |tPHLY - tPHLX| THE MAX4890E/MAX4892E SWITCHES ARE FULLY BIDIRECTIONAL. Figure 4. Output Skew 8 Figure 5. Human Body ESD Test Model (MIL-STD-883, Method 3015) _______________________________________________________________________________________ 1000 Base-T, ±15kV ESD Protection LAN Switches DOCKING STATION TRANSFORMER RJ-45 LED CONNECTOR NOTEBOOK 0B2 1B2 2B2 3B2 TRD0_P TRD0_N A0 A1 TRD1_P TRD1_N A2 A3 TRD2_P TRD2_N A4 A5 TRD3_P TRD3_N A6 A7 ETHERNET PHY/MAC 6B2 7B2 _LED2 MAX4892E 0B1 1B1 2B1 3B1 4B1 5B1 RJ-45 6B1 7B1 LED_ SEL SEL_DOCK TRANSFORMER LED_OUT 4B2 5B2 _LED1 LED _______________________________________________________________________________________ 9 MAX4890E/MAX4892E Typical Operating Circuit 1000 Base-T, ±15kV ESD Protection LAN Switches MAX4890E/MAX4892E Functional Diagrams A0 A1 0B1 1B1 A0 A1 0B1 1B1 0B2 0B2 1B2 1B2 A2 2B1 A2 2B1 A3 3B1 A3 3B1 2B2 2B2 3B2 3B2 A4 4B1 A4 4B1 A5 5B1 A5 5B1 4B2 4B2 5B2 5B2 A6 6B1 A6 6B1 A7 7B1 A7 7B1 6B2 6B2 7B2 7B2 LED0 0LED1 0LED2 LED1 1LED1 1LED2 LED2 2LED1 2LED2 SEL MAX4890E SEL MAX4892E 10 ______________________________________________________________________________________ 1000 Base-T, ±15kV ESD Protection LAN Switches MAX4890E/MAX4892E Pin Configurations (continued) A0 V+ SEL 0B1 1B1 0B2 1B2 + A1 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 20 4B1 19 5B1 18 4B2 17 5B2 9 10 11 12 13 14 15 16 6B1 8 7B1 A5 *EP 6B2 7 7B2 A4 N.C. 6 GND N.C. A7 5 A6 N.C. MAX4890E TQFN *EXPOSED PADDLE CONNECTED TO GND. ______________________________________________________________________________________ 11 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) QFN THIN.EPS MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches 12 ______________________________________________________________________________________ 1000 Base-T, ±15kV ESD Protection LAN Switches QFN THIN.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX4890E/MAX4892E Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)