MAX14778

19-5929; Rev 0; 6/11 EVALUATION KIT AVAILABLE MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer General Description The MAX14778 dual 4:1 analog multiplexer supports analog signals up to Q25V with a single 3.0 to 5.5V supply. Each multiplexer has separate control inputs to allow independent switching, making the device ideal for multiplexing different communications signals with the same connector pins. Extended ESD protection of Q6kV (Human Body Model) enable direct interfacing to cables and connectors. The MAX14778 features a low 1.5I (max) on-resistance and 3mI (typ) flatness to maximize signal integrity over the entire common-mode voltage range. Each multiplexer can carry up to 300mA of continuous current through the multiplexer in either direction. The MAX14778 supports switching of full-speed USB 1.1 signals (12Mbps) and RS-485 data rates of up to 20Mbps. The MAX14778 is available in a 20-pin (5mm x 5mm) TQFN package and is specified over the -40NC to +85NC extended temperature range. S ±25V Signal Range S Single 3.0V to 5.5V Supply S Two Independent Multiplexers S 1.5I RON (max) S 3mI RON Flatness (typ) S 300mA Maximum Current Through Multiplexer S 78pF Input Capacitance S 75MHz Large-Signal Bandwidth S Break-Before-Make Operation S Extended ESD Protection on A� and B� Pins  Q6kV Human Body Model (HBM) Ordering Information appears at end of data sheet. For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX14778.related. Features Applications RS-485/RS-232/USB 1.1 Multiplexing POS Peripherals Handheld Industrial Devices Communication Systems Audio/Data Multiplexing Connector Sharing Gaming Machines A0 A1 ENA SA0 Functional Diagram SA1 VDD BIAS GENERATION VP VN CONTROL A MAX14778 ACOM A2 A3 B0 B1 BCOM B2 B3 CONTROL B ENB SB0 SB1 GND ����������������������������������������������������������������� 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. MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VDD .......................................................................... -0.3V to +6V VP ........................... -0.3V to the lesser of +52V and (VN + 70V) VN ................ The lesser of (VDD - 40V) and (VP - 70V) to +0.3V VP to VN ................................................................. -0.3V to +70V ENA, ENB, SA_, SB_ ................................ -0.3V to (VDD + 0.3V) A_, ACOM, B_, BCOM .. (VN - 0.3V) to the lesser of (VP + 0.3V) and (VN + 52V) Continuous Current Through Switch ............................. ±500mA Continuous Power Dissipation (TA = +70NC) TQFN (derate 33.3mW/NC above +70NC)............... 2666.7mW 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) .......... 30NC/W Junction-to-Case Thermal Resistance (BJC) ................. 2NC/W Note 1: Package 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 (VDD = 3.0V to 5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VDD = 5V, TA = +25NC.) (Note 2) PARAMETER DC CHARACTERISTICS Supply Voltage Range VDD ENA = ENB = high Supply Current IDD VENA = VENB = VDD/2 Charge-Pump Threshold Analog Signal Range Continuous Current Through Switch On-Resistance On-Resistance Flatness A_, B_ Off-Leakage Current ACOM, BCOM Off-Leakage Current A_, B_ On-Leakage Current VDDTH VIN ICOM RON RFLAT(ON) IA(OFF), IB(OFF) IACOM(OFF), IBCOM(OFF) IA(ON), IB(ON) Figure 1, ICOM = Q300mA, VIN = Q25V Figure 1, -25V P VIN P +25V, ICOM = Q300mA Figure 2, VIN = 25V, VOUT = 0V Figure 2, VOUT = 15V, VIN = 0V Figure 2, VIN = Q25V, ACOM or BCOM is unconnected -200 -1 -1 (Note 3) Figure 1, switch open or closed -25 -300 0.84 3 +200 +1 +1 VDD P VDDTH VDD > VDDTH VDD P VDDTH VDD > VDDTH 3.0 4.27 2.54 4.31 2.59 4.64 +25 +300 1.5 5.5 10 6 10 6 V V mA Ω mΩ nA FA FA mA V SYMBOL CONDITIONS MIN TYP MAX UNITS ����������������������������������������������������������������� Maxim Integrated Products 2 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer ELECTRICAL CHARACTERISTICS (continued) (VDD = 3.0V to 5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VDD = 5V, TA = +25NC.) (Note 2) PARAMETER SYMBOL VDD = 5.5V Input Logic-Low Voltage VIL VDD = 4.5V VDD = 3.6V VDD = 3.0V VDD = 5.5V Input Logic-High Voltage VIH VDD = 4.5V VDD = 3.6V VDD = 3.0V AC CHARACTERISTICS Power-Up Time Enable Turn-On Time Enable Turn-Off Time Break-Before-Make Interval Charge Injection Off-Isolation Crosstalk -3dB Bandwidth Total Harmonic Distortion Plus Noise Input Capacitance THERMAL PROTECTION Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis ESD PROTECTION A_, B_ Pins (Note 4) All Other Pins Human Body Model Human Body Model Q6 Q2 kV kV TSHUT THYST 145 25 NC NC tPOR tON tOFF tBBM Q VISO VCT BW THD+N CIN Figure 3, VIN = Q10V, RL = 10kI, CL = 15pF Figure 3, VIN = Q10V, RL = 10kI, CL = 15pF Figure 4, VIN = Q10V, RL = 10kI, CL = 15pF Figure 5, VA_ = 0V, CL = 1nF Figure 6, VA_ = 1VRMS, f = 100kHz, RL = 50I, CL = 15pF Figure 6, f = 100kHz, RS = RL = 50I Figure 6, RS = 50I, RL = 50I RS = RL = 1kI, f = 20Hz to 20kHz A_, B_ pins 840 1720 -80 -103 75 0.003 78 404 2 1.5 ms ms ms Fs pC dB dB MHz % pF 2.1 2.0 1.9 1.7 V CONDITIONS MIN TYP MAX 0.8 0.8 0.7 0.7 V UNITS LOGIC INPUTS (ENA, ENB, SA�, SB�) Note 2: All units are production tested at TA = +25NC. Specifications over temperature are guaranteed by design. Note 3: When VDD is higher than the charge-pump threshold, the internal 5V regulated charge pump is turned off and the input to the high-voltage charge pumps is provided by VDD. Note 4: The MAX14778 requires a 1µF capacitor on both VP and VN to GND to guarantee full ESD protection. See the Applications Information section for details on ESD test conditions. ����������������������������������������������������������������� Maxim Integrated Products 3 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Test Circuits/Timing Diagrams V +5V 1µF VDD MAX14778 A_ B_ VIN GND ACOM BCOM ICOM Figure 1. On-Resistance Measurement +5V 1µF +5V 1µF VDD IA(OFF) IB(OFF) VDD IACOM(OFF) IBCOM(OFF) ACOM BCOM IA(ON) IB(ON) MAX14778 A_ B_ GND MAX14778 A_ B_ GND ACOM BCOM A VIN A VOUT VIN A Figure 2. Leakage Current Measurement ����������������������������������������������������������������� Maxim Integrated Products 4 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Test Circuits/Timing Diagrams (continued) MAX14778 VIN A_ B_ ENA ENB LOGIC INPUT CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VIN R + R L ON ACOM BCOM RL VOUT LOGIC INPUT VIH VIL 50% t R < 20ns t F < 20ns CL VOUT SWITCH OUTPUT 0V t ON t OFF 0.9 x V0UT 0.1 x VOUT ( ) Figure 3. Turn-On/Turn-Off Timing +5V 1µF +5V VDD SA0 ENA SA1 LOGIC INPUT A_ VIN GND ACOM tR < 20ns 0V LOGIC INPUT VOUT VOUT SWITCH OUTPUT 0V 80% MAX14778 RL CL tBBM CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VIN R + R L ON ( ) Figure 4. Break-Before-Make Timing ����������������������������������������������������������������� Maxim Integrated Products 5 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Test Circuits/Timing Diagrams (continued) +5V +5V A_ B_ ENA ENB GND VDD LOGIC INPUT 0V ACOM BCOM VOUT OFF ON OFF MAX14778 LOGIC INPUT C L = 1 nF VOUT DVOUT Q = CL x DVOUT Figure 5. Charge Injection VDD NETWORK ANALYZER 0V OR VDD ENA SA_ 50I A0 VIN 50I 50I OFF-ISOLATION = 20log VOUT VIN V ON-LOSS = 20log OUT VIN V CROSSTALK = 20log OUT VIN MAX14778 ACOM VOUT MEAS 50I 50I REF MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN ACOM AND "OFF" A_ TERMINAL ON EACH MULTIPLEXER. -3dBW IS MEASURED BETWEEN ACOM AND "ON" A_ TERMINAL ON EACH MULTIPLEXER. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH MULTIPLEXER IS REVERSED; WORST VALUES ARE RECORDED. Figure 6. Off-Isolation, -3dB Bandwidth, and Crosstalk ����������������������������������������������������������������� Maxim Integrated Products 6 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Typical Operating Characteristics (VDD = 5.0V, TA = +25°C, unless otherwise noted.) ON-RESISTANCE vs. COMMON-MODE VOLTAGE MAX14778 toc01 ON-RESISTANCE vs. COMMON-MODE VOLTAGE MAX14778 toc02 OFF-LEAKAGE CURRENT vs. TEMPERATURE MAX14778 toc03 1.00 0.99 ON-RESISTANCE (I) VDD = 3.3V 0.98 0.97 VDD = 5V 0.96 IACOM = 300mA 0.95 -25 -15 -5 5 15 1.5 1.4 1.3 ON-RESISTANCE (I) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 IACOM = 300mA -25 -15 -5 TA = -40°C 0.5 5 15 TA = +25°C TA = +85°C 100 OFF-LEAKAGE CURRENT (nA) 10 1 VA1 = 25V A0 SELECTED ACOM = GND -40 -15 10 TA (°C) 35 60 85 25 0.1 25 VACOM (V) VACOM (V) ON-LEAKAGE CURRENT vs. TEMPERATURE MAX14778 toc04 CHARGE INJECTION vs. ANALOG SIGNAL VOLTAGE MAX14778 toc05 SUPPLY CURRENT vs. TEMPERATURE 3.5 3.0 IDD (mA) 2.5 2.0 1.5 1.0 VDD = 3.3V MAX14778 toc06 1000 1,200 1,000 800 Q (pC) 600 400 4.0 ON-LEAKAGE CURRENT (nA) 100 VDD = 5V 10 VA0 = 25V A0 SELECTED ACOM UNCONNECTED -40 -15 10 TA (°C) 35 60 85 200 0 -25 -15 -5 5 VACOM (V) CL = 1nF 15 25 0.5 0 -40 -15 10 TA (°C) 35 60 85 1 CROSSTALK vs. FREQUENCY MAX14778 toc07 OFF-ISOLATION vs. FREQUENCY MAX14778 toc08 FREQUENCY RESPONSE 0 -1 -2 VOUT / VIN (dB) -3 -4 -5 -6 -7 -8 -9 -10 A0 TO ACOM A0 SELECTED 0.1 1 10 100 MAX14778 toc09 0 -20 CROSSTALK (dB) -40 -60 -80 -100 -120 A0 TO B0 A0 AND B0 SELECTED 0 -10 OFF-ISOLATION (dB) -20 -30 -40 -50 -60 -70 A0 TO ACOM A2 SELECTED 1 0.1 1 10 100 0.1 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) ����������������������������������������������������������������� Maxim Integrated Products 7 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Typical Operating Characteristics (continued) (VDD = 5.0V, TA = +25°C, unless otherwise noted.) THD+N vs. FREQUENCY MAX14778 toc10 PSRR vs. FREQUENCY VDD TO ACOM -20 -40 PSRR (dB) -60 -80 -100 -120 MAX14778 toc11 1 0.1 THD+N (%) A0 TO ACOM RS = 600I RL = 1kI 0 0.01 0.001 0.0001 0.02 0.2 2 20 FREQUENCY (kHz) -140 0.01 0.1 1 FREQUENCY (kHz) 10 100 TURN-ON TIME vs. ANALOG-SIGNAL VOLTAGE MAX14778 toc12 TURN-OFF TIME vs. ANALOG-SIGNAL VOLTAGE 0.45 0.40 0.35 tOFF (ms) 0.30 0.25 0.20 0.15 0.10 0.05 0 MAX14778 toc13 1.20 1.18 1.16 1.14 tON (ms) 1.12 1.10 1.08 1.06 1.04 1.02 1.00 -25 -15 -5 5 15 0.50 25 -25 -15 -5 5 15 25 VACOM (V) VACOM (V) ����������������������������������������������������������������� Maxim Integrated Products 8 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Pin Configuration VDD SB0 SB1 SA1 12 SA0 11 TOP VIEW 15 14 13 ENB 16 B3 17 B2 18 B1 19 B0 20 10 9 ENA A3 A2 A1 A0 MAX14778 8 7 + 1 BCOM 2 VP 3 GND 4 VN *EP 6 5 ACOM *CONNECT EXPOSED PAD TO VN. TQFN 5mm x 5mm Pin Description PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 — NAME BCOM VP GND VN ACOM A0 A1 A2 A3 ENA SA0 SA1 VDD SB1 SB0 ENB B3 B2 B1 B0 EP MUX B Common Terminal Positive Charge-Pump Output. Bypass VP to GND with a 1FF ceramic capacitor (35V or higher). Ground Negative Charge-Pump Output. Bypass VN to GND with a 1FF ceramic capacitor (30V or higher). MUX A Common Terminal MUX A Bidirectional Analog Input/Output 0 MUX A Bidirectional Analog Input/Output 1 MUX A Bidirectional Analog Input/Output 2 MUX A Bidirectional Analog Input/Output 3 MUX A Enable Input MUX A Channel Select Input 0 MUX A Channel Select Input 1 Power-Supply Input. Bypass VDD to GND with a 1FF ceramic capacitor. MUX B Channel Select Input 1 MUX B Channel Select Input 0 MUX B Enable Input MUX B Bidirectional Analog Input/Output 3 MUX B Bidirectional Analog Input/Output 2 MUX B Bidirectional Analog Input/Output 1 MUX B Bidirectional Analog Input/Output 0 Exposed Pad. Connect EP to VN. EP is not intended as an electrical connection point. FUNCTION ����������������������������������������������������������������� Maxim Integrated Products 9 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Truth Tables Table 1. MUX A Channel Selection ENA 0 1 1 1 1 X = Don’t care SA1 X 0 0 1 1 SA0 X 0 1 0 1 ACOM CONNECTED TO Open A0 A1 A2 A3 Table 2. MUX B Channel Selection ENB 0 1 1 1 1 X = Don’t care SB1 X 0 0 1 1 SB0 X 0 1 0 1 BCOM CONNECTED TO Open B0 B1 B2 B3 Detailed Description The MAX14778 dual 4:1 analog multiplexer integrates bias circuitry to provide a Q25V analog voltage range with a single 3.0 to 5.5V supply. This extended input range allows multiplexing different communications signals such as RS-232, RS-485, audio and USB 1.1 onto the same connector. The MAX14778 contains a total of three charge pumps to generate bias voltages for the internal switches: a 5V regulated charge pump, a positive high-voltage (+35V) charge pump, and a negative high-voltage (-27V) charge pump. When VDD is above 4.7V (typ), the 5V regulated charge pump is bypassed and VDD provides the input for the highvoltage charge pumps, reducing overall supply current. An external 1.0FF capacitor is required for each high-voltage charge pump between VP/VN and GND. The MAX14778 transmits signals of up to Q25V with a single 3.0 to 5.5V supply due to integrated bias circuitry. The device features 1.5Ω (max) on-resistance and 3mI (typ) flatness for analog signals between -25V and +25V (see the Typical Operating Characteristics). The current flow through the multiplexers can be bidirectional, allowing operation either as a multiplexer or demultiplexer. The MAX14778 has two digital select inputs for each MUX: SA1 and SA0 control MUX A; SB1 and SB0 control MUX B. Drive the digital select inputs high or low to select which input (A_, B_) is connected to the common terminal (ACOM, BCOM) for each MUX. See the Truth Tables for more information. Each MUX features an independent enable input (ENA and ENB). Drive ENA or ENB low to disconnect all inputs from the common terminal for that MUX, regardless of the status of the select inputs or the other enable input. Digital Interface Integrated Bias Generation Applications Information The MAX14778 supports a Q25V analog signal range independently for each input/output, allowing physical connector sharing between interface types that have differing signal ranges. The multiprotocol connector-sharing application in the Typical Operating Circuits shows an application with RS-232, half-duplex RS-485, full-speed USB 1.1, and audio signals sharing the same connector. The device allows signals to pass over the entire signal range specified by each standard while safely isolating the unused transceivers. Ensure that no negative signals are present on the A_, B_, or ACOM/BCOM inputs before one second has passed after applying VDD. Connector Sharing Analog Signal Levels Power-Up Conditions ���������������������������������������������������������������� Maxim Integrated Products 10 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Electrostatic discharge (ESD)-protection structures are incorporated on all pins to protect against electrostatic discharges up to Q2kV Human Body Model (HBM) encountered during handling and assembly. A_ and B_ are further protected against ESD up to Q6kV (HBM) without damage. The ESD structures withstand high ESD both in normal operation and when the device is powered down. After an ESD event, the MAX14778 continues to function without latchup. High-ESD Protection ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. The MAX14778 requires a 1FF capacitor on both VP and VN to GND to guarantee full ESD protection. Figure 7 shows the Human Body Model. Figure 8 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5kI resistor. ESD Test Conditions Human Body Model RC 1MI CHARGE CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1.5kI DISCHARGE RESISTANCE DEVICE UNDER TEST IP 100% 90% AMPERES Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) CS 100pF STORAGE CAPACITOR 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Figure 7. Human Body ESD Test Model Figure 8. Human Body Current Waveform ���������������������������������������������������������������� Maxim Integrated Products 11 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Typical Operating Circuits +5V 1µF VDD VP TX RS-232 TRANSCEIVER RX A RS-485 TRANSCEIVER B D+ USB 1.1 TRANSCEIVER DL AUDIO SOURCE R A0 B0 ACOM A1 B1 A2 B2 A3 B3 CONTROL ENA MULTIPROTOCOL CONNECTOR SHARING APPLICATION SA1 SA0 SB1 SB0 ENB GND BCOM MAX14778 VN 1µF 1µF SHARED CONNECTOR +5V CONTROL INPUTS ���������������������������������������������������������������� Maxim Integrated Products 12 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Typical Operating Circuits (continued) +5V 1µF VDD VP TX RS-232 TRANSCEIVER RX A RS-485 TRANSCEIVER B D+ USB 1.1 TRANSCEIVER DCLOCK KEYBOARD WEDGE DATA A0 B0 ACOM A1 B1 A2 B2 A3 B3 CONTROL ENA SCANNER CONNECTOR SHARING APPLICATION SA1 SA0 SB1 SB0 ENB GND BCOM MAX14778 VN 1µF 1µF SHARED CONNECTOR +5V CONTROL INPUTS ���������������������������������������������������������������� Maxim Integrated Products 13 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Ordering Information PART MAX14778ETP+ TEMP RANGE -40NC to +85NC PIN-PACKAGE 20 TQFN-EP* Package Information For the latest package outline information and land patterns (footprints), 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 20 TQFN-EP PACKAGE CODE T2055+4 OUTLINE NO. 21-0140 LAND PATTERN NO. 90-0009 +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Chip Information PROCESS: BiCMOS ���������������������������������������������������������������� Maxim Integrated Products 14 MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Revision History REVISION NUMBER 0 REVISION DATE 6/11 Initial release DESCRIPTION PAGES CHANGED — 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 15 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.