19-1609; Rev 2; 5/05 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers General Description Features M The MAX4534 (single 4-to-1) and MAX4535 (dual 2-to- ♦ ±40V Fault Protection with Power Off A 1) fault-protected multiplexers operate with ±4.5V to ±25V Fault Protection with ±15V Supplies X ±20V dual supplies or a +9V to +36V single supply. These multiplexers feature fault-protected inputs, rail- ♦ No Power-Supply Sequencing Required 4 to-rail signal-handling capability, and overvoltage ♦ All Channels Off with Power Off 5 clamping at 150mV beyond the rails. Both parts feature ±40V overvoltage protection with supplies off and ±25V ♦ Rail-to-Rail Signal Handling 3 protection with supplies on. On-resistance is 400Ω max ♦ Output Clamped to Appropriate Supply Voltage 4 and is matched between channels to 10Ωmax. All digi- / During Fault Condition M tal inputs have TTL logic thresholds, ensuring TTL/CMOS-logic compatibility when using a single ♦ 1.0kΩtyp Output Clamp Resistance During A +12V or dual ±15V supplies. Overvoltage X Applications ♦ 400Ωmax On-Resistance 4 Data-Acquisition Systems ♦ 20ns typ Fault Response Time 5 3 Industrial and Process Control ♦ ±4.5V to ±20V Dual Supplies 5 Avionics +9V to +36V Single Supply Signal Routing ♦ TTL/CMOS-Compatible Logic Inputs Redundant/Backup Systems Pin Configurations Ordering Information PART TEMP RANGE PIN-PACKAGE TOP VIEW MAX4534CUD 0°C to +70°C 14 TSSOP MAX4534 MAX4534CSD 0°C to +70°C 14 Narrow SO MAX4534CPD 0°C to +70°C 14 Plastic DIP A0 1 14 A1 MAX4534EUD -40°C to +85°C 14 TSSOP EN 2 13 GND MAX4534ESD -40°C to +85°C 14 Narrow SO V- 3 LOGIC 12 V+ MAX4534EPD -40°C to +85°C 14 Plastic DIP NO1 4 11 NO3 MAX4535CUD 0°C to +70°C 14 TSSOP NO2 5 10 NO4 MAX4535CSD 0°C to +70°C 14 Narrow SO N.C. 6 9 N.C. MAX4535CPD 0°C to +70°C 14 Plastic SO COM 7 8 N.C. MAX4535EUD -40°C to +85°C 14 TSSOP MAX4535ESD -40°C to +85°C 14 Narrow SO TSSOP/SO/DIP MAX4535EPD -40°C to +85°C 14 Plastic DIP MAX4535 A0 1 14 N.C. EN 2 13 GND V- 3 LOGIC 12 V+ NO1A 4 11 NO1B NO2A 5 10 NO2B N.C. 6 9 N.C. COMA 7 8 COMB TSSOP/SO/DIP ________________________________________________________________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.

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5 ABSOLUTE MAXIMUM RATINGS 3 (Voltages Referenced to GND) Continuous Power Dissipation (TA= +70°C) 5 V+...........................................................................-0.3V to +44V 14-Pin TSSOP (derate 6.3mW/°C above +70°C)..........500mW V-............................................................................-44V to +0.3V 14-Pin Narrow SO (derate 8mW/°C above +70°C).......640mW 4 V+ to V-...................................................................-0.3V to +44V 14-Pin Plastic DIP (derate 10mW/°C above +70°C).....800mW X COM_, A_, EN (Note 1)........................(V- - 0.3V) to (V+ + 0.3V) Operating Temperature Ranges NO_ (Note 2)...........................................(V+ - 40V) to (V- + 40V) MAX453_C_D.......................................................0°C to +70°C A NO_ to COM_ (Note 2)............................................-40V to +40V MAX453_E_D....................................................-40°C to +85°C M NO_ Overvoltage with Switch Power On (Note 2)...-36V to +36V Storage Temperature Range.............................-65°C to +150°C NO_ Overvoltage with Switch Power Off (Note 2)...-40V to +40V Lead Temperature (soldering, 10s).................................+300°C / Continuous Current into Any Terminal..............................±30mA 4 Peak Current Into Any Terminal 3 (pulsed at 1ms, 10% duty cycle).................................±100mA 5 Note 1: COM_, EN, and A_ pins are not fault protected. Signals on COM_, EN, or A_ exceeding V+ or V- are clamped by internal 4 diodes. Limit forward diode current to maximum current rating. X Note 2: NO_ pins are fault-protected. Signals on NO_ exceeding -25V to +25V may damage the device during power-on conditions. A When the power is off the maximum voltage range is -40V to +40V. M 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—Dual Supplies (V+ = +15V, V- = -15V, VA_H= VENH= 2.4V, VA_L= VENL= 0.8V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS ANALOG SWITCH Fault-Free Analog Signal Range VNO_ Applies with power on or off V- V+ V +25°C 275 400 On-Resistance RON VCOM_= ±10V, INO_= 1mA Ω C, E 500 On-Resistance Match Between +25°C 2 10 Channels (Note 4) ∆RON VCOM_= ±10V, INO_= 1mA C, E 15 Ω N(NOo_te O 5f)f-Leakage Current INO_(OFF) VNO_= ±10V, VCOM_= +–10V +C25, °EC -0-5.5 0.01 05.5 nA +25°C -2 0.05 2 MAX4534 C(NOoMte_ 5 O)ff-Leakage Current ICOM_(OFF) VVCNOO_M=_ =+– 1±01V0V, +C25, °EC --610 0.05 610 nA MAX4535 C, E -30 30 +25°C -2 0.1 2 MAX4534 C(NOoMte_ 5 O)n-Leakage Current ICOM_(ON) VVCNOOM_ =_ =fl o±a1ti0nVg, +C25, °EC --810 0.1 810 nA MAX4535 C, E -40 40 FAULT PROTECTION Fault-Protected Analog Signal Applies with power on -25 +25 Range (Note 6) VNO_ Applies with power off -40 +40 V COM_ Output Leakage Current, +25°C -20 20 nA Supplies On ICOM_ VNO_= ±25V, VEN= 0, VCOM_= 0 C, E -1 1 µA 2 _______________________________________________________________________________________

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) M (V+ = +15V, V- = -15V, VA_H= VENH= 2.4V, VA_L= VENL= 0.8V, TA= TMINto TMAX, unless otherwise noted. Typical values are at A TA = +25°C.) (Note 3) X PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS 4 NSuOp_p Ilniepsu Ot Lneakage Current, INO_ VVNENO_== 0 ±25V, VCOM_= +–10V, +C25, °EC --22000 22000 nA 5 3 NSuOp_p Ilniepsu Ot Lffeakage Current, INO_ VVN+O =_ =0 ,± V4-0 =V ,0 VCOM_= 0, +C25, °EC --250 250 µnAA 4 / M COM_ On Clamp Output VNO_= +25V VCOM_= 0 7 10 13 Current, Supplies On ICOM_ VNO_= -25V VCOM_= 0 +25°C -13 -11 -7 mA A CReOsMis_ta Oncne C, lSaumppp lOieust pOunt RCOM_ VNO_= ±25V +C25, °EC 00.0.18 1.0 23.5 kΩ X 4 ±Fault Response Time RL = 10kΩ, VNO_= ±25V 20 ns 5 ±Fault Recovery Time RL= 10kΩ, VNO_= ±25V 2.5 µs 3 Fault Trip Threshold RL= 1kΩ V- - 400 V+ + 400 mV 5 LOGIC INPUT Input Logic Voltage High VA_H, 2.4 V VENH Input Logic Voltage Low VA_L, 0.8 V VENL Input Logic Current IA_, IEN VA_ = VEN= 0.8V or 2.4V -1 1 µA SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time tON VFiNgOu_re= 3 ±10V, RL= 1kΩ, +C25, °EC 135 420705 ns Enable Turn-Off Time tOFF VFiNgOu_re= 3 ±10V, RL = 1kΩ, +C25, °EC 60 225000 ns +25°C 130 350 Transition Time tTRANS Figure 2 ns C, E 500 Break-Before-Make Time Delay tBBM VFiNgOu_re= 4 ±10V, RL = 1kΩ, 10 60 ns Charge Injection Q CL= 1nF, VNO_= 0, RS= 0, 1 10 pC (Note 7) Figure 5 O(Nfof-tIeso 8la)tion VISO Rf =L =1M 5H0Ωz,, FViNgOur_e= 6 1VRMS, -62 dB C(Nhoatnen 9e)l-to-Channel Crosstalk VCT Rf =L =1M 5H0Ωz,, FViNgOur_e= 7 1VRMS, -53 dB NO_ Off-Capacitance CNO_(OFF) f = 1MHz, Figure 8 5 pF f = 1MHz, MAX4534 6.5 COM_ Off-Capacitance CCOM_(OFF) Figure 8 MAX4535 4 pF f = 1MHz, MAX4534 13.5 COM_ On-Capacitance CCOM_(ON) Figure 8 MAX4535 10.5 pF _______________________________________________________________________________________ 3

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5 ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) 3 (V+ = +15V, V- = -15V, VA_H= VENH= 2.4V, VA_L= VENL= 0.8V, TA= TMINto TMAX, unless otherwise noted. Typical values are at 5 TA = +25°C.) (Note 3) 4 PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS X POWER SUPPLY A Power-Supply Range V+, V- ±4.5 ±20 V M +25°C 225 400 All VA_ = VEN= 0 or 5V C, E 600 / V+ Supply Current I+ µA 4 +25°C 125 200 3 All VA_ = VEN= 0 or 15V C, E 300 5 +25°C 125 200 4 V- Supply Current I- All VA_ = VEN= 0, 5V, or 15V µA C, E 300 X +25°C 0.01 1 A All VA_ = VEN= 0 or 15V C, E 10 M GND Supply Current IGND +25°C 100 200 µA All VA_ = VEN= 5V C, E 300 ELECTRICAL CHARACTERISTICS—Single +12V Supply (V+ = +12V, V- = 0, VA_H = VENH = 2.4V, VA_L = VENL = 0.8V, TA = TMIN to TMIN, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS Fault-Free Analog Signal Range VNO_ Applies with power on or off 0 V+ V +25°C 650 950 On-Resistance RON VCOM_= 10V, INO_= 500µA Ω C, E 1100 On-Resistance Match Between +25°C 10 25 Channels (Note 5) ∆RON VCOM_= 10V, INO_= 500µA C, E 40 Ω N(NOo_te Os f5f-,L 1e0a)kage Current INO_(OFF) VVCNOO_M=_ =1 V1,0 1V0, V1V; +C25, °EC --01.05 0.01 01.05 nA +25°C -2 2 MAX4534 COM_ Off-Leakage Current VCOM_= 10V, C, E -60 60 (Notes 5, 10) ICOM_(OFF) 1V; +25°C -1 1 nA VNO_= 1V,10V MAX4535 C, E -30 30 +25°C -2 2 VCOM_= 10V, MAX4534 COM_ On-Leakage Current 1V; C, E -80 80 (Notes 5, 10) ICOM_(ON) VNO_= 10V, +25°C -1 1 nA 1V, or floating MAX4535 C, E -40 40 4 _______________________________________________________________________________________

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued) M (V+ = +12V, V- = 0, VA_H = VENH = 2.4V, VA_L = VENL = 0.8V, TA = TMIN to TMIN, unless otherwise noted. Typical values are at A TA= +25°C.) (Note 3) X PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS 4 FAULT PROTECTION 5 Fault-Protected Analog Signal Applies with all power on -25 25 Range (Note 6) VNO_ Applies with all power off +25°C -40 40 V 3 4 CSuOpMp_ly O Ountp ut Leakage Current, ICOM_ VVNCOOM_= = ±025V, +C2,5 E°C --210 210 nµAA /M NO_ Input Leakage Current, +25°C -20 20 nA A Supply On INO_ VNO_ = ±25V, VCOM_= 0, C, E -5 5 µA X NO_ Input Leakage Current, +25°C -20 0.1 20 nA Supply Off INO_ VNO_= ±40V, V+ = 0 C, E -5 5 µA 4 5 CSuOpMp_ly OONn Output Current, ICOM_ VNO_= 25V +25°C 2 3 5 nA 3 5 COM_ ON Output Resistance, Supply On RCOM_ VNO_= 25V +25°C 2.4 6 kΩ Fault Trip Threshold RL= 1kΩ V- - 400 V+ + 400 mV LOGIC INPUT Input Logic Voltage High VA_H, 2.4 V VENH ANALOG SWITCH Input Logic Voltage Low VA_L, 0.8 V VENL Input Logic Current IA_, IEN VA_ = VEN= 0.8V or 2.4V -1 1 µA SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time tON VFiCgOuMre_ 3= 10V, RL = 2kΩ, +C2,5 E°C 220 750000 ns Enable Turn-Off Time tOFF VFiCgOuMre_ 3= 10V, RL = 2kΩ, +C25, °EC 100 325500 ns Break-Before-Make Time Delay tBBM VFiCgOuMre_ 4= 10V, RL = 2kΩ, +25°C 50 100 ns Charge Injection (Note 7) Q CL= 1nF, VNO_= 0, RS= 0, +25°C 2 10 pC Figure 5 Off-Isolation (Note 8) VISO Rf =L =1M 5H0Ωz,, FViNgOur_e= 6 1VRMS, -62 dB C(Nhoatnen 9e)l-to-Channel Crosstalk VCT Rf =L =1M 5H0Ωz,, FViNgOur_e= 7 1VRMS, -65 dB _______________________________________________________________________________________ 5

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5 ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued) 3 (V+ = +12V, V- = 0, VA_H = VENH = 2.4V, VA_L = VENL = 0.8V, TA = TMIN to TMIN, unless otherwise noted. Typical values are at 5 TA= +25°C.) (Note 3) 4 PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS X POWER SUPPLY A Power-Supply Range V+ 9 36 V M +25°C 75 150 All VA__ = VEN= 0 or 12V C, E 250 / V+ Supply Current I+ µA 4 +25°C 150 275 3 All VA__= VEN= 5V C, E 375 µA 5 4 Note 3: Algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. X Note 4: ∆RON= RON(MAX)- RON(MIN). Note 5: Leakage parameters are 100% tested at maximum-rated hot temperature and guaranteed by correlation at TA= 25°C. A Note 6: NO_ pins are fault protected, and COM_ pins are not fault protected. The max input voltage, on NO_ pins, depends upon M the COM_ load configuration. Generally, the max input voltage is ±25V, with ±15V supplies, and a load referred to ground. For more detailed information, see the NO_ Input Voltage section. Note 7: Guaranteed by design. Note 8: Off-isolation = 20 log10 (VCOM_/ VNO_), VCOM_= output, VNO_= input to off switch. Note 9: Between any two analog inputs. Note 10: Leakage testing for single-supply operation is guaranteed by testing with dual supplies. Typical Operating Characteristics (V+ = +15V, V- = -15V, TA= +25°C, unless otherwise noted.) ON-RESISTANCE vs. ON-RESISTANCE vs. ON-RESISTANCE vs. VCOM AND VCOM (DUAL SUPPLIES) VCOM (SINGLE SUPPLY) TEMPERATURE (DUAL SUPPLIES) 1980000000 VV+- == -+44..55VV MAX4534 toc01 11910000000 V+ = +9V MAX4534 toc02 560000 VV+- == -+1155VV +125°C MAX4534 toc03 800 +85°C 700 V+ = +10V 700 V+ = +12V 400 ΩR()ON 650000 VV+- == -+1155VV V- = -10V ΩR()ON 650000 V+ = +V15+V = +20V ΩR()ON 300 +70°C 400 V+ = +30V +25°C 400 200 300 300 -40°C -55°C 200 V+ = +20V 200 V+ = +36V 100 100 V- = -20V 100 0 0 0 -20 -15 -10 -5 0 5 10 15 20 0 5 10 15 20 25 30 35 40 -15 -10 -5 0 5 10 15 VCOM (V) VCOM (V) VCOM (V) 6 _______________________________________________________________________________________

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers Typical Operating Characteristics (continued) M (V+ = +15V, V- = -15V, TA= +25°C, unless otherwise noted.) A X ON-RESISTANCE vs. VCOM AND CHARGE INJECTION vs. VNO 4 TEMPERATURE (SINGLE SUPPLY) LEAKAGE CURRENT vs. TEMPERATURE (DUAL AND SINGLE SUPPLIES) 5 1980000000 +125°C MAX4534 toc04 1010µn MAX4508/09toc05 34 MAX4534 toc6 34 700 +85°C +70°C 10n 2 /M ΩR()ON 546000000 +25°C -40°C LEAKAGE (A)1010np ICOM_ON ICOM_OFF Q (pC) 10 VV+- == -+1155VV AX 300 -55°C 10p -1 4 200 INO_OFF V+ = 12V 5 V+ = +12V 1p -2 V- = 0 100 V- = 0 3 0 0.1p -3 5 0 2 4 6 8 10 12 14 -55 -30 -5 20 45 70 95 120 145 -15 -10 -5 0 5 10 15 VCOM (V) TEMPERATURE (°C) VNO (V) ENABLE ON/OFF-TIMES vs. ENABLE ON/OFF-TIMES vs. ENABLE ON/OFF-TIMES SUPPLY VOLTAGE (DUAL SUPPLIES) SUPPLY VOLTAGE (SINGLE SUPPLY) vs. TEMPERATURE 345000 MAX4534 toc07 445500000 MAX4534 toc08 112860000 MAX4534 toc09 300 350 140 t, t (ns)ONOFF 212055000 tON t, t (ns)ONOFF 223500000 t, t (ns)ONOFF 11802000 tON 100 tOFF 150 tON 60 tOFF 100 40 50 50 tOFF 20 0 0 0 ±4 ±6 ±8 ±10 ±12 ±14 ±16 ±18 ±20 0 5 10 15 20 25 30 35 -40 -20 0 20 40 60 80 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) TEMPERATURE (°C) POWER-SUPPLY CURRENT vs. POWER-SUPPLY CURRENT vs. POWER-SUPPLY CURRENT TEMPERATURE (VAO = VA1 = VEN = 0) TEMPERATURE (VAO = VA1 = VEN = 5V) vs. LOGIC VOLTAGE (VA_, VEN) 212055000 MAX4534 toc10 450000 MAX4534 toc11 235000 VV+- == 012V MAX4534 toc12 I+ 300 µI+, I-, I (A)GND 1-5500000 IGND µI+, I-, I (A)GND 2100000 I+ µ+I, -I, GND (A) 112050000 I+ -100 -150 I- -100 IGND 50 -200 -200 I- -250 -300 0 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 0 2 4 6 8 10 12 14 TEMPERATURE (°C) TEMPERATURE (°C) VA_, VEN (V) _______________________________________________________________________________________ 7

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5 Typical Operating Characteristics (continued) 3 (V+ = +15V, V- = -15V, TA= +25°C, unless otherwise noted.) 5 4 POWER-SUPPLY CURRENT LOGIC-LEVEL THRESHOLD X vs. LOGIC VOLTAGE (VA_, VEN) FREQUENCY RESPONSE vs. SUPPLY VOLTAGE MA 345000000 MAX4534 toc13 -1100 BANDWIDTH MAX4534 toc14 D (V) 23..50 V- = 0 DUAL MAX4534toc15 4534/ µ+I, -I, GND (A) 1200000 IGNDI+ LOSS (dB) ---735000 CROSSTALK C-LEVEL THRESHOL 112...050 SUPPLIES SSUINPGPLLEY X -100 I- OFF-ISOLATION LOGI -90 0.5 A -250 M -300 -110 0 0 2 4 6 8 10 12 14 0.01 0.1 1 10 100 1000 0 5 10 15 20 25 30 35 40 VA_, VEN (V) FREQUENCY (MHz) SUPPLY VOLTAGE (V) FAULT-FREE SIGNAL PERFORMANCE INPUT OVERVOLTAGE vs. OUTPUT CLAMPING +1IN5V_ MAX4534toc16 +25V MAX4534toc17 0 IN_ 10V/div -15V 0 +15V +15V COM_ -25V 0 0 0 10V/div COM_ -15V -15V 5µs/div 5µs/div FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING ±25V OVERVOLTAGE INPUT WITH THE OUTPUT WITH ±15V SUPPLIES CLAMPED AT ±15V 8 _______________________________________________________________________________________

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers Pin Descriptions M MAX4534 (Single 4-to-1 Mux) MAX4535 (Dual 2-to-1 Mux) A X PIN NAME FUNCTION PIN NAME FUNCTION 4 1 A0 Address Bit 0 1 A0 Address Bit 0 5 2 EN Enable Input 2 EN Enable Input 3 3 V- Negative Supply Voltage 3 V- Negative Supply Voltage 4 4 NO1 Channel Input 1 (fault protected) 4 NO1A Channel Input 1A (fault protected) / M 5 NO2 Channel Input 2 (fault protected) 5 NO2A Channel Input 2A (fault protected) A 6, 8, 9 N.C. No connection 6, 9, 14 N.C. No connection 7 COM Analog Output 7 COMA Mux Output A X 10 NO4 Channel Input 4 (fault protected) 8 COMB Mux Output B 4 11 NO3 Channel Input 3 (fault protected) 10 NO2B Channel Input 2B (fault protected) 5 12 V+ Positive Supply Voltage 11 NO1B Channel Input 1B (fault protected) 3 13 GND Ground 12 V+ Positive Supply Voltage 5 14 A1 Address Bit 1 13 GND Ground Truth Tables to-rail signal operation. Third, when a signal on VNO_ exceeds the supply rails (i.e., a fault condition), the MAX4534 (Single 4-to-1 Mux) voltage on COM_ is limited to the supply rails. Operation is identical for both fault polarities. A1 A0 EN ON SWITCH When the NO_ voltage goes beyond supply rails (fault X X 0 None condition), the NO_ input becomes high impedance 0 0 1 NO1 regardless of the switch state or load resistance. When 0 1 1 NO2 power is removed, and the fault protection is still in 1 0 1 NO3 effect, the NO_ terminals are a virtual open circuit. The fault can be up to ±40V, with V+ = V- = 0. If the switch 1 1 1 NO4 is on, the COM_ output current is furnished from the V+ X = Don’t care; logic 0: VAL ≤+0.8; logic 1: VAH ≥+2.4V or V- pin by “booster” FETs connected to each supply pin. These FETs can source or sink up to 10mA. MAX4535 (Dual 2-to-1 Mux) The COM_ pins are not fault-protected. If a voltage source is connected to any COM_ pin, it should be lim- A0 EN COMA COMB ited to the supply voltages. Exceeding the supply volt- X 0 None None age will cause high currents to flow through the ESD 0 1 NO1A NO1B protection diodes, damaging the device (see Absolute 1 1 NO2A NO2B Maximum Ratings). X = Don’t care; logic 0: VAL ≤+0.8; logic 1: VAH ≥+2.4V Figure 1 shows the internal construction, with the ana- log signal paths shown in bold. A single, normally open (NO) switch is shown. The analog switch is formed by Detailed Description the parallel combination of N-channel FET N1 and P- The MAX4534/MAX4535 differ considerably from tradi- channel FET P1, which are driven on and off simultane- tional fault-protected multiplexers, offering several ously, according to the input fault condition and the advantages. First, they are constructed with two paral- logic level state. lel FETs, allowing very low resistance when the switch . is on. Second, they allow signals on the NO_ pins that are within or beyond the supply rails to be passed through the switch to the COM terminal. This allows rail- _______________________________________________________________________________________ 9

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5 3 NORMALLY OPEN SWITCH CONSTRUCTION V+ 5 P2 4 X A HIGH FAULT M P1 / 4 NO_ COM_ N1 3 LOW 5 FAULT 4 X ON A_ A M MAX4534 MAX4535 GND N2 V- ESD DIODE Figure 1. Functional Diagram NO_ Input Voltage off in response to A_ signals (Figure 1). The parallel The maximum allowable input voltage for safe opera- combination of N1 and P1 forms a low-value resistor tion depends on whether supplies are on or off and on between NO_ and COM_ so that signals pass equally the load configuration at the COM output. If COM is well in either direction. referred to a voltage other than ground, but within the Positive Fault Condition supplies, VNO_ may range higher or lower than the When the signal on NO_ exceeds V+ by about 150mV, supplies, provided the absolute value of VNO_ - the positive fault comparator output goes high, turning VCOM_ is less than 40V. For example, if the load is off FETs N1 and P1 (Figure 1). This makes the NO_ pin referred to +10V at COM_, then the NO_ voltage range high impedance regardless of the switch state. If the can be from +50V to -30V. As another example, if the switch state is “off,” all FETs turn off, and both NO_ and load is connected to -10V at COM_, the NO_ voltage COM_ are high impedance. If the switch state is “on,” range is limited to -50V to +30V. FET P2 turns on, clamping COM_ to V+. If the supplies are ±15V and COM is referenced to ground through a load, the maximum NO_ voltage is Negative Fault Condition ±36V. If the supplies are off and the COM output is ref- When the signal on NO_ goes about 150mV below V-, erenced to ground, the maximum NO_ voltage is ±40V. the negative fault comparator output goes high, turning off FETs N1 and P1 (Figure 1). This makes the NO pin Normal Operation high impedance regardless of the switch state. If the Two comparators continuously compare the voltage on switch state is “off,” all FETs turn off, and both NO_ and the NO_ pin with V+ and V- supply voltages. When the COM_ are high impedance. If the switch state is “on,” signal on NO_ is between V+ and V-, the multiplexer FET N2 turns on, clamping COM_ to V-. behaves normally, with FETs N1 and P1 turning on and 10 ______________________________________________________________________________________

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers Transient Fault Condition Applications Information M When a fast rising or falling transient on NO_ exceeds V+ or V-, the output (COM_) follows the input (NO_) to Ground A the supply rail with only a few nanoseconds delay. This There is no connection between the analog signal X delay is due to the switch on-resistance and circuit paths and GND. The analog signal paths consist of an 4 capacitance to ground. When the input transient N-channel and a P-channel MOSFET with their sources returns to within the supply rails, however, there is a and drains paralleled, and their gates driven out of 5 longer output recovery time. For positive faults, the phase to V+ and V- by the logic-level translators. 3 recovery time is typically 2.5µs. For negative faults, the V+ and GND power the internal logic and logic-level 4 recovery time is typically 1.3µs. These values depend translators and set the input logic thresholds. The logic- / M on the COM_ output resistance and capacitance. The level translators convert the logic levels to switched V+ delays do not depend on the fault amplitude. Higher and V- signals to drive the gates of the channel A COM_ output resistance and capacitance increase the MOSFETs. This drive signal is the only connection recovery times. between the power supplies and the analog signals. X GND, A_, EN, and COM_ have ESD protection diodes 4 Non-Fault-Protected Pins to V+ and V-. 5 FETs N2 and P2 can source about ±10mA from V+ or V- to the COM_ pin in the fault condition (Figure 1). Supply Current Reduction 3 Ensure that if the COM_ pin is connected to a low - When the logic signals are driven rail-to-rail from 0 to 5 impedance load, the 30mA absolute maximum current +15V or -15V to +15V, the current consumption will be rating is never exceeded, both in normal and fault con- reduced from 300µA (typ) to 180µA. ditions. Power Supplies The GND, COM_, EN, and A_ pins do not have fault The MAX4534/MAX4535 operate with bipolar supplies protection. Reverse ESD protection diodes are internal- between ±4.5V and ±20V. The V+ and V- supplies ly connected between GND, COM_, A_, EN, and both need not be symmetrical, but their sum cannot exceed V+ and V-. If a signal on GND, COM_, EN, or A_ the 44V absolute maximum rating. exceeds V+ or V- by more than 300mV, one of these diodes will conduct. During normal operation, these The MAX4534/MAX4535 operate from single supplies reverse-biased ESD diodes leak a few nanoamps of between +9V and +36V when V- is connected to GND. current to V+ and V-. Fault Protection Voltage and Power-Off The maximum fault voltage on the NO_ pins is ±40V from ground when the power is off. With ±15V supply voltages, the highest voltage on NO_ can be V- + 40V, and the lowest voltage on NO_ can be V+ - 40V. Caution: Exceeding these limits can damage the IC. Logic-Level Thresholds The logic-level thresholds are CMOS and TTL compati- ble with V+ = 4.5V to 16.5V. ______________________________________________________________________________________ 11

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5 Test Circuits/Timing Diagrams 3 5 V+ 4 V+ X A1 NO1 +10V A NO2, NO3 A0 M MAX4534 NO4 -10V 4/ +5V EN GND V-COM VOUT LINOPGUICT +3V 50% ttRF << 2200nnss 3 35pF VA_ 0 R L 5 V- VNO__ 90% 4 V+ SWITCH OUTPUT X A0 V+ NO1B +10V VOUT A 90% M NO1A, NO2A VNO__ MAX4535 NO2B -10V tTRANS tTRANS +5V EN COMB V ON OUT GND V- 35pF R L V- Figure 2. Address Transition Time V+ VEN EN V+ NO1 +10V NO2–NO4 A0 A1 MAX4534 50Ω GND V-COM VOUT LOGIC +3V 50% ttRF << 2200nnss 35pF INPUT RL VEN 0 V- tON(EN) tOFF(EN) V+ 10V 90% 90% SWITCH VEN EN V+ NO1B +10V OUTPUT VOUT NO1A, NO2A NO2B, COMA A0 0 MAX4535 COMB VOUT 50Ω GND V- 35pF RL V- Figure 3. Enable Switching Time 12 ______________________________________________________________________________________

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers Test Circuits/Timing Diagrams (continued) M A V+ X +3V VEN EN V+ LOGIC +3V 50% ttRF < < 2 200nnss 45 INPUT NO1–NO4 +10V VA 0 3 A0 4 MAX4534 / 80% M A1 SWITCH COM VOUT OUTPUT A GND V- 35pF VOUT 50Ω RL tOPEN X V- 4 5 3 Figure 4. MAX4534 Break-Before-Make Interval 5 V+ RS NO_ V+ +3V VEN EN LOGIC ON OFF ON INPUT VS A0 MAX4534 VEN 0 CHANNEL COM VOUT SELECT A1 CL ∆VOUT 1nF VOUT GND V- ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF. V- Q = ∆VOUT CL Figure 5. Charge Injection V+ 10nF V+ 10nF NO1 V+ NO1 V+ VIN RS = 50Ω NO4 R VIN NO2 MAX4534 1k NO4 MAX4534 A0 COM VOUT A0 COM VOUT RS = 50Ω A1 RL RL GND EN V- 50Ω A1 GND EN V- 50Ω 10nF 10nF V- V- OFF-ISOLATION = 20log VOUT CROSSTALK = 20log VOUT VIN VIN Figure 6. Off-Isolation Figure 7. Crosstalk ______________________________________________________________________________________ 13

Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5 Test Circuits/Timing Diagrams (continued) 3 5 V+ 4 +25V VNO_ VCOM_ X V+ A1 NO1 +15V A CHANNEL 1MHz M SELECT MAX4534 NO4 CAPACITANCE ANALYZER A0 -15V / COM 4 GND EN V- 3 -25V 5 V- 4 Figure 8. NO_, COM_Capacitance Figure 9. Transient Behavior of Fault Condition X A M ___________________Chip Information TRANSISTOR COUNT: 265 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.