19-5252; Rev 1; 6/11 High-Bandwidth, ±15kV ESD Protection LVDS Switch The MAX14979E is optimized for high-speed differential switching applications. The device is ideal for low-voltage differential signal (LVDS) and low-voltage positive emitter-coupled logic (LVPECL) switching applications. The MAX14979E provides enhanced electrostatic discharge (ESD) protection up to Q15kV and excellent highfrequency response, making this device especially useful for interfaces that must go to an outside connection. The MAX14979E provides extremely low capacitance (CON) as well as low resistance (RON) for low-insertion loss and bandwidth up to 650MHz (1.3Gbps). In addition to the four pairs of double-pole/double-throw (DPDT) switches, the MAX14979E provides low-frequency (up to 50MHz) and AUX switching that can be used for LED lighting or other applications. Features S ±15kV ESD Protected per MIL-STD-883, Method 3015 S Single +3.0V to +3.6V Power-Supply Voltage S Low On-Resistance (RON): 4I (typ), 6.5I (max) S Low On-Capacitance (CON): 8pF (typ) S -23dB Return Loss (100MHz) S -3dB Bandwidth: 650MHz S Built-In AUX Switches for Switching Indicators S Low 450µA (max) Quiescent Current S Bidirectional 8 to 16 Multiplexer/Demultiplexer S Space-Saving, Lead-Free, 36-Pin, 6mm x 6mm TQFN Package Eye Diagram The MAX14979E is available in a space-saving 36-pin TQFN package and operates over the standard -40NC to +85NC temperature range. Applications Notebook Computers Switch LVDS to Graphics Panels LVDS and LVPECL Switching 100mV/div Ordering Information PART TEMP RANGE PIN-PACKAGE MAX14979EETX+ -40NC to +85NC 36 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. f = 300MHz 500ps/div Typical Operating Circuit appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. MAX14979E General Description MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) V+..........................................................................-0.3V to +4.0V All Other Pins................................................-0.3V to (V+ + 0.3V) Continuous Current (COM_ _ to NC_ _/NO_ _)............. Q120mA Continuous Current (AUX0_ to AUX1_/AUX2_)................ Q40mA Peak Current (COM_ _ to NC_ _/NO_ _) (pulsed at 1ms, 10% duty cycle)................................ Q240mA Current into Any Other Pin............................................... Q20mA Continuous Power Dissipation (TA = +70NC) 36-Pin TQFN (derate 35.7mW/NC above +70NC) .......2.85mW Operating Temperature Range . ....................... -40NC to +85NC Junction Temperature ................................................... +150NC Storage Temperature Range .......................... -65NC to +150NC Lead Temperature (soldering 10s) .................................+300NC Soldering Temperature (reflow).......................................+260NC 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) TQFN Junction-to-Ambient Thermal Resistance (BJA).............8NC/W Junction-to-Case Thermal Resistance (BJC)..................1NC/W Note 1: P ackage thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (V+ = +3.0V to +3.6V, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = +3.3V, TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS +3.6 V POWER SUPPLIES Operating Power-Supply Range V+ +3.0 ANALOG SWITCH On-Resistance On-Resistance AUX Switches On-Resistance Match Between Channels On-Resistance Flatness Off-Leakage Current On-Leakage Current RON RONAUX V+ = 3V, ICOM_ _ = -40mA, VCOM_ _ = 0V, 1.5V, 3V V+ = 3V, ICOM_ _ = -40mA, VCOM_ _ = 0V, 3V (Note 3) RFLAT(ON) V+ = 3V, ICOM_ _ = -40mA, VCOM_ _ = 0V, 1.5V _(OFF) ILCOM_ _(ON) TMIN to TMAX 5.5 6.5 V+ = 3V, IAUX0_ = -40mA, VAUX0_ = 0V, 1.5V, 3V DRON ILCOM_ 4 TA = +25NC 40 0.5 TA = +25NC TMIN to TMAX 1.5 2 0.01 I I I I V+ = 3.6V, VCOM_ _ = 0.3V, 3.3V; VNC_ _ or VNO_ _ = 3.3V, 0.3V -1 +1 FA V+ = 3.6V, VCOM_ _ = 0.3V, 3.3V; VNC_ _ or VNO_ _ = 3.3V, 0.3V or unconnected -1 +1 FA SWITCH AC PERFORMANCE Insertion Loss ILOS RS = RL = 50I, unbalanced, f = 1MHz, (Note 3) 0.6 dB Return Loss RLOS f = 100MHz -23 dB VCT1 Any switch to any switch; RS = RL = 50I, unbalanced, Figure 1 Crosstalk VCT2 f = 25MHz -50 f = 125MHz -26 dB SWITCH AC CHARACTERISTICS -3dB Bandwidth BW RS = RL = 50I, unbalanced 650 MHz Off-Capacitance COFF f = 1MHz, COM_ _ 3.5 pF On-Capacitance CON f = 1MHz, COM_ _ 8 pF 2 High-Bandwidth, ±15kV ESD Protection LVDS Switch MAX14979E ELECTRICAL CHARACTERISTICS (continued) (V+ = +3.0V to +3.6V, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = +3.3V, TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Turn-On Time tON VCOM_ _ = 1V, RL = 100I, Figure 2 50 ns Turn-Off Time tOFF VCOM_ _ = 1V, RL = 100I, Figure 2 50 ns Propagation Delay Output Skew Between Ports tPLH, tPHL RS = RL = 50I, 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 V+ = 3.6V, VSEL = 0V or V+ I+ V+ = 3.6V, VSEL = 0V or V+ 280 ESD Protection COM_ _, NC_ _, NO_ _ HBM (spec MIL-STD-883, Method 3015) Q15 kV All Other Pins HBM (spec MIL-STD-883, Method 3015) Q2 kV Quiescent Supply Current 0.8 2.0 V V 100 -5 mV +5 FA 450 FA ESD PROTECTION Note 2: Specifications at TA = -40NC are guaranteed by design. Note 3: Guaranteed by design. MAX14979E SINGLE-ENDED BANDWIDTH NETWORK ANALYZER 50Ω TRACE SINGLE-ENDED CROSSTALK NETWORK ANALYZER NETWORK ANALYZER 50Ω TRACE COM1+ 2 50Ω TRACE COM13 SINGLE-ENDED OFF-ISOLATION NETWORK ANALYZER COM0+ 36 50Ω TRACE COM2+ 7 NC0+ 31 50Ω TRACE NC1+ 26 R13 49.9Ω NC125 R14 49.9Ω NC2+ 22 50Ω TRACE NETWORK ANALYZER NETWORK ANALYZER R15 49.9Ω Figure 1. Single-Ended Bandwidth, Crosstalk, and Off-Isolation 3 MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch SEL VIH 50% 3.0V 50% 2.0V VIL COM_ _ NC_ _ tON 1.0V tPLH tPHL 50% 50% tOFF tOFF VH 0V 2.0V NC_ _ NO_ _ tON NO_ _ 50% 50% VL PULSE SKEW = tSK(o) = |tPHL - tPLH| THE MAX14979E SWITCHES ARE FULLY BIDIRECTIONAL. 0V Figure 2. Turn-On and Turn-Off Times Figure 3. Propagation Delay Times 3.0V 2.0V COM_ _ 1.0V tPLH tPHL VOH 2.0V NC_ _ NO_ _ VOL tPLH tPHL VOH NC_ _ NO_ _ 2.0V VOL OUTPUT SKEW = tSK(o) = |tPHL - tPHL| THE MAX14979E SWITCHES ARE FULLY BIDIRECTIONAL. Figure 4. Output Skew 4 High-Bandwidth, ±15kV ESD Protection LVDS Switch TA = -40°C 14 12 2 1 6 4 TA = +25°C TA = -40°C 36 32 1.0 1.5 2.0 2.5 20 16 12 0 0 3.0 0.5 IL(OFF) 1.0 1.5 2.0 2.5 3.0 -40 60 85 300 280 260 -1 -2 -3 -4 -5 240 -6 220 -7 200 MAX14979E toc05 0 INSERTION LOSS (dB) 320 35 SINGLE-ENDED INSERTION LOSS vs. FREQUENCY MAX14979E toc04 V+ = 3.6V 10 TEMPERATURE (°C) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE 340 IL(ON) -15 VAUX_ (V) VCOM_ _ (V) QUIESCENT SUPPLY CURRENT (µA) 0.5 24 4 0 0 28 8 2 0 MAX14979E toc03 18 16 10 8 TA = +25°C TA = +85°C 20 40 LEAKAGE CURRENT (pA) TA = +85°C MAX14979E toc02 22 RONAUX (Ω) 4 RON (Ω) 24 MAX14979E toc01 5 3 LEAKAGE CURRENT vs. TEMPERATURE AUX_ ON-RESISTANCE vs. VAUX_ ON-RESISTANCE vs. VCOM_ _ 6 -8 -40 -15 10 35 TEMPERATURE (°C) 60 85 1 10 100 1000 FREQUENCY (MHz) 5 MAX14979E Typical Operating Characteristics (V+ = 3.3V, TA = +25NC, unless otherwise noted.) High-Bandwidth, ±15kV ESD Protection LVDS Switch SEL NC1+ NC1- NO1+ NO1- NC2+ NC2- NO2+ NO2- 27 26 25 24 23 22 21 20 19 TOP VIEW NO0- 28 18 NC3+ NO0+ 29 17 NC3- NC0- 30 16 NO3+ NC0+ 31 15 NO3- AUX2 32 14 AUX2B AUX1 33 13 AUX1B AUX0 34 12 AUX0B V+ 35 11 GND COM0+ 36 10 COM3- MAX14979E *EP 1 2 3 4 5 6 7 8 9 COM0- COM1- AUX0A AUX1A AUX2A COM2+ COM2- COM3+ + COM1+ MAX14979E Pin Configuration TQFN *CONNECT EP TO GND. Pin Description 6 PIN NAME 1 COM0- Common LVDS Differential Terminal for Switch 0 FUNCTION 2 COM1+ Common LVDS Differential Terminal for Switch 1 3 COM1- Common LVDS Differential Terminal for Switch 1 4 AUX0A AUX0A Input 5 AUX1A AUX1A Output. Drive SEL low (SEL = 0) to connect AUX0A to AUX1A. 6 AUX2A AUX2A Output. Drive SEL high (SEL = 1) to connect AUX0A to AUX2A. 7 COM2+ Common LVDS Differential Terminal for Switch 2 8 COM2- Common LVDS Differential Terminal for Switch 2 9 COM3+ Common LVDS Differential Terminal for Switch 3 10 COM3- Common LVDS Differential Terminal for Switch 3 11 GND 12 AUX0B AUX0B Input 13 AUX1B AUX1B Output. Drive SEL low (SEL = 0) to connect AUX0B to AUX1B. 14 AUX2B AUX2B Output. Drive SEL high (SEL = 1) to connect AUX0B to AUX2B. Ground 15 NO3- Normally Open LVDS Differential Terminal for Switch 3 16 NO3+ Normally Open LVDS Differential Terminal for Switch 3 17 NC3- Normally Closed LVDS Differential Terminal for Switch 3 18 NC3+ Normally Closed LVDS Differential Terminal for Switch 3 19 NO2- Normally Open LVDS Differential Terminal for Switch 2 20 NO2+ Normally Open LVDS Differential Terminal for Switch 2 21 NC2- Normally Closed LVDS Differential Terminal for Switch 2 High-Bandwidth, ±15kV ESD Protection LVDS Switch PIN NAME 22 NC2+ Normally Closed LVDS Differential Terminal for Switch 2 23 NO1- Normally Open LVDS Differential Terminal for Switch 1 24 NO1+ Normally Open LVDS Differential Terminal for Switch 1 25 NC1- Normally Closed LVDS Differential Terminal for Switch 1 26 NC1+ Normally Closed LVDS Differential Terminal for Switch 1 27 SEL Select Input. SEL selects switch connection. See Table1. 28 NO0- Normally Open LVDS Differential Terminal for Switch 0 29 NO0+ Normally Open LVDS Differential Terminal for Switch 0 30 NC0- Normally Closed LVDS Differential Terminal for Switch 0 31 NC0+ Normally Closed LVDS Differential Terminal for Switch 0 32 AUX2 AUX2 Output. Drive SEL high (SEL = 1) to connect AUX0 to AUX2. 33 AUX1 AUX1 Output. Drive SEL low (SEL = 0) to connect AUX0 to AUX1. 34 AUX0 AUX0 Input 35 V+ 36 COM0+ — EP FUNCTION Positive-Supply Voltage Input. Bypass V+ to GND with a 0.1FF ceramic capacitor. Common LVDS Differential Terminal for Switch 0 Exposed Pad. Connect exposed pad to GND or leave it unconnected. Detailed Description The MAX14979E is a high-speed analog switch targeted at LVDS and other low-voltage switching up to 600MHz. In a typical application, the MAX14979E switches two sets of LVDS sources to a laptop LVDS panel. For extra security, the MAX14979E is protected against Q15kV ESD shocks. See the Functional Diagram. With its low resistance and capacitance, as well as highESD protection, the MAX14979E can be used to switch most low-voltage differential signals, such as LVDS and LVPECL, as long as the signals do not exceed the maximum ratings of the device. The MAX14979E switches provide low capacitance and on-resistance to meet low insertion loss and return-loss specifications. The MAX14979E has three additional AUX switches. Digital Control Inputs The MAX14979E provides a single digital control SEL. SEL controls the switches as well as the AUX switches, as shown in Table 1. switches are bidirectional, allowing COM_ _ and NC_ _/ NO_ _ to be configured as either inputs or outputs. ESD Protection The MAX14979E is characterized using the HBM for Q15kV of ESD protection. Figure 5 shows the HBM. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kI resistor. All signal and control pins are ESD protected to Q15kV HBM. RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1500Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Analog-Signal Levels The on-resistance of the MAX14979E is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics). The Figure 5. Human Body ESD Test Model (MIL-STD-883, Method 3015) 7 MAX14979E Pin Description (continued) MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch Applications Information Functional Diagram Typical Operating Circuit COM0+ NC0+ COM0- NC0NO0+ NO0- COM1+ NC1+ COM1- NC1NO1+ NO1- COM2+ NC2+ COM2- NC2NO2+ NO2- COM3+ NC3+ COM3- NC3- The Typical Operating Circuit shows the MAX14979E in a dual graphics 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 designcontrolled-impedance PCB traces as short as possible. Ensure that bypass capacitors are as close as possible to the device. Use large ground planes where possible. NO3+ NO3AUX0A AUX1A Chip Information PROCESS: BiCMOS AUX2A AUX0B AUX2B AUX0 AUX1 AUX2 SEL MAX14979E Table 1. Truth Table 8 Package Information AUX1B SEL CONNECTION 0 COM_ _ to NC_ _, AUX0_ to AUX1_ 1 COM_ _ to NO_ _, AUX0_ to AUX2_ For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 36 TQFN-EP T3666+3 21-0141 90-0050 High-Bandwidth, ±15kV ESD Protection LVDS Switch MAX14979E LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_- NO0+ NO0NO1+ NO1NO2+ NO2NO3+ NO3- COM0+ COM0- COM1+ COM1- INTERNAL GRAPHICS LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_- COM2+ COM2- NC0+ NC0NC1+ NC1NC2+ NC2NC3+ NC3- COM3+ COM3- SEL CONTROL LVDS LCD PANEL MAX14979E LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_- NO0+ NO0NO1+ NO1NO2+ NO2NO3+ NO3- COM0+ COM0- COM1+ COM1- SVDO TO LVDS LVDS_+ LVDS_LVDS_+ LVDS_LVDS_+ LVDS_CLOCK_+ CLOCK_- COM2+ COM2- NC0+ NC0NC1+ NC1NC2+ NC2NC3+ NC3- COM3+ COM3- SEL CONTROL NOTE: THE MAX14979E HAS THREE SPDT AUXILLIARY SWITCHES (AUX) THAT CAN BE USED FOR OTHER SWITCHING SUCH AS LEDs AND I2C. THESE ARE NOT SHOWN IN THE DIAGRAM. 9 MAX14979E Typical Operating Circuit MAX14979E High-Bandwidth, ±15kV ESD Protection LVDS Switch Revision History REVISION NUMBER REVISION DATE 0 4/10 Initial release 6/11 Updated Package Thermal Characteristics style; corrected Pin Configuration and Pin Description for AUX1_ and AUX2_ pins 1 DESCRIPTION PAGES CHANGED — 2, 6 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. 10 © 2011 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.