19-1609; Rev 2; 5/05 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers The MAX4534 (single 4-to-1) and MAX4535 (dual 2-to1) fault-protected multiplexers operate with 4.5V to 20V dual supplies or a +9V to +36V single supply. These multiplexers feature fault-protected inputs, railto-rail signal-handling capability, and overvoltage clamping at 150mV beyond the rails. Both parts feature 40V overvoltage protection with supplies off and 25V protection with supplies on. On-resistance is 400 max and is matched between channels to 10 max. All digital inputs have TTL logic thresholds, ensuring TTL/CMOS-logic compatibility when using a single +12V or dual 15V supplies. Applications Features 40V Fault Protection with Power Off 25V Fault Protection with 15V Supplies No Power-Supply Sequencing Required All Channels Off with Power Off Rail-to-Rail Signal Handling Output Clamped to Appropriate Supply Voltage During Fault Condition 1.0k typ Output Clamp Resistance During Overvoltage 400 max On-Resistance Data-Acquisition Systems 20ns typ Fault Response Time Industrial and Process Control Avionics 4.5V to 20V Dual Supplies +9V to +36V Single Supply Signal Routing TTL/CMOS-Compatible Logic Inputs Redundant/Backup Systems Pin Configurations TOP VIEW MAX4534 A0 1 14 A1 13 GND EN 2 V- 3 LOGIC 12 V+ NO1 4 11 NO3 NO2 5 10 NO4 N.C. 6 9 N.C. COM 7 8 N.C. TSSOP/SO/DIP Ordering Information PART TEMP RANGE MAX4534CUD 0C to +70C MAX4534CSD MAX4534CPD MAX4534EUD MAX4534ESD MAX4534EPD MAX4535CUD MAX4535CSD MAX4535CPD MAX4535EUD MAX4535ESD MAX4535EPD 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 14 TSSOP 14 Narrow SO 14 Plastic DIP 14 TSSOP 14 Narrow SO 14 Plastic DIP 14 TSSOP 14 Narrow SO 14 Plastic SO 14 TSSOP 14 Narrow SO 14 Plastic DIP MAX4535 A0 1 14 N.C. 13 GND EN 2 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 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 MAX4534/MAX4535 General Description MAX4534/MAX4535 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to GND) V+ ...........................................................................-0.3V to +44V V- ............................................................................-44V to +0.3V V+ to V-...................................................................-0.3V to +44V COM_, A_, EN (Note 1)........................ (V- - 0.3V) to (V+ + 0.3V) NO_ (Note 2)...........................................(V+ - 40V) to (V- + 40V) NO_ to COM_ (Note 2) ............................................-40V to +40V NO_ Overvoltage with Switch Power On (Note 2). ..-36V to +36V NO_ Overvoltage with Switch Power Off (Note 2). ..-40V to +40V Continuous Current into Any Terminal..............................30mA Peak Current Into Any Terminal (pulsed at 1ms, 10% duty cycle).................................100mA Continuous Power Dissipation (TA = +70C) 14-Pin TSSOP (derate 6.3mW/C above +70C) ..........500mW 14-Pin Narrow SO (derate 8mW/C above +70C) .......640mW 14-Pin Plastic DIP (derate 10mW/C above +70C) .....800mW Operating Temperature Ranges MAX453_C_D.......................................................0C to +70C MAX453_E_D ....................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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 diodes. Limit forward diode current to maximum current rating. Note 2: NO_ pins are fault-protected. Signals on NO_ exceeding -25V to +25V may damage the device during power-on conditions. When the power is off the maximum voltage range is -40V to +40V. 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 = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS V+ V 275 400 ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance On-Resistance Match Between Channels (Note 4) NO_ Off-Leakage Current (Note 5) VNO_ RON VCOM_ = 10V, INO_ = 1mA RON VCOM_ = 10V, INO_ = 1mA INO_(OFF) - VNO_ = 10V, VCOM_ = +10V MAX4534 COM_ Off-Leakage Current (Note 5) ICOM_(OFF) VCOM_ = 10V, - VNO_ = +10V MAX4535 ICOM_(ON) +25C 500 C, E 2 +25C 10 15 C, E +25C -0.5 C, E -5 +25C -2 C, E -60 +25C -1 C, E -30 0.01 0.5 5 0.05 nA 2 60 0.05 1 nA 30 +25C -2 C, E -80 +25C -1 C, E -40 40 Applies with power on -25 +25 Applies with power off -40 +40 +25C -20 20 nA C, E -1 1 A MAX4534 COM_ On-Leakage Current (Note 5) V- Applies with power on or off VCOM_ = 10V, VNO_ = floating MAX4535 0.1 2 80 0.1 1 nA FAULT PROTECTION Fault-Protected Analog Signal Range (Note 6) VNO_ COM_ Output Leakage Current, Supplies On ICOM_ 2 VNO_ = 25V, VEN = 0, VCOM_ = 0 _______________________________________________________________________________________ V Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers (V+ = +15V, V- = -15V, VA_H = VENH = 2.4V, VA_L = VENL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS NO_ Input Leakage Current, Supplies On INO_ - VNO_= 25V, VCOM_ = +10V, VEN = 0 NO_ Input Leakage Current, Supplies Off INO_ VNO_= 40V, VCOM_ = 0, V+ = 0, V- = 0 COM_ On Clamp Output Current, Supplies On ICOM_ COM_ On Clamp Output Resistance, Supplies On RCOM_ VNO_ = +25V VCOM_ = 0 VNO_ = -25V VCOM_ = 0 VNO_ = 25V Fault Response Time RL = 10k, VNO_ = 25V Fault Recovery Time RL = 10k, VNO_ = 25V Fault Trip Threshold RL = 1k TA MIN +25C -20 TYP MAX 20 C, E -200 200 +25C -20 20 nA C, E -5 5 A 7 10 13 -13 -11 -7 +25C 0.1 1.0 2.5 C, E 0.08 +25C 3 20 nA mA k ns 2.5 V- - 400 UNITS s V+ + 400 mV LOGIC INPUT Input Logic Voltage High VA_H, VENH Input Logic Voltage Low VA_L, VENL Input Logic Current IA_, IEN 2.4 VA_ = VEN = 0.8V or 2.4V V -1 0.8 V 1 A SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time tON VNO_ = 10V, RL = 1k, Figure 3 +25C Enable Turn-Off Time tOFF VNO_ = 10V, RL = 1k, Figure 3 +25C Transition Time tTRANS Break-Before-Make Time Delay Charge Injection (Note 7) tBBM Q 135 C, E 60 C, E 130 C, E VNO_ = 10V, RL = 1k, Figure 4 CL = 1nF, VNO_ = 0, RS = 0, Figure 5 200 250 +25C Figure 2 275 400 350 500 10 60 1 ns ns ns ns 10 pC Off-Isolation (Note 8) VISO RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 6 -62 dB Channel-to-Channel Crosstalk (Note 9) VCT RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 7 -53 dB 5 pF NO_ Off-Capacitance CNO_(OFF) f = 1MHz, Figure 8 COM_ Off-Capacitance CCOM_(OFF) f = 1MHz, Figure 8 MAX4534 6.5 MAX4535 4 COM_ On-Capacitance CCOM_(ON) f = 1MHz, Figure 8 MAX4534 13.5 MAX4535 10.5 pF pF _______________________________________________________________________________________ 3 MAX4534/MAX4535 ELECTRICAL CHARACTERISTICS--Dual Supplies (continued) MAX4534/MAX4535 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers ELECTRICAL CHARACTERISTICS--Dual Supplies (continued) (V+ = +15V, V- = -15V, VA_H = VENH = 2.4V, VA_L = VENL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS 20 V POWER SUPPLY Power-Supply Range V+, V- 4.5 All VA_ = VEN = 0 or 5V V+ Supply Current I+ All VA_ = VEN = 0 or 15V V- Supply Current I- All VA_ = VEN = 0, 5V, or 15V All VA_ = VEN = 0 or 15V GND Supply Current IGND All VA_ = VEN = 5V +25C 225 C, E 400 600 +25C 125 C, E 200 A 300 +25C 125 C, E 200 300 +25C 0.01 1 100 200 C, E 10 +25C C, E A A 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 = +25C.) (Note 3) PARAMETER SYMBOL Fault-Free Analog Signal Range VNO_ On-Resistance On-Resistance Match Between Channels (Note 5) CONDITIONS RON VCOM_ = 10V, INO_ = 500A RON VCOM_ = 10V, INO_ = 500A INO_(OFF) COM_ Off-Leakage Current (Notes 5, 10) VCOM_ = 10V, ICOM_(OFF) 1V; VNO_ = 1V,10V 4 VCOM_ = 10V, 1V; VNO_ = 1V, 10V VCOM_ = 10V, 1V; ICOM_(ON) VNO_ = 10V, 1V, or floating MAX4534 MAX4535 MAX4534 MAX4535 MIN TYP MAX UNITS V+ V 650 950 0 Applies with power on or off NO_ Off-Leakage Current (Notes 5, 10) COM_ On-Leakage Current (Notes 5, 10) TA +25C 1100 C, E 10 +25C 25 40 C, E +25C -0.5 C, E -10 0.01 0.5 10 +25C -2 2 C, E -60 60 +25C -1 1 C, E -30 30 +25C -2 2 C, E -80 80 +25C -1 1 C, E -40 40 _______________________________________________________________________________________ nA nA nA Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers (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 = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS FAULT PROTECTION Fault-Protected Analog Signal Range (Note 6) VNO_ COM_ Output Leakage Current, Supply On ICOM_ Applies with all power on Applies with all power off VNO_ = 25V, VCOM = 0 NO_ Input Leakage Current, Supply On INO_ VNO_ = 25V, VCOM_ = 0, NO_ Input Leakage Current, Supply Off INO_ VNO_= 40V, V+ = 0 +25C +25C 25 -40 40 -20 20 nA V C, E -1 1 A +25C -20 20 nA C, E -5 5 A +25C -20 20 nA C, E -5 5 A 2 3 5 nA 2.4 6 k COM_ ON Output Current, Supply On ICOM_ VNO_ = 25V +25C COM_ ON Output Resistance, Supply On RCOM_ VNO_ = 25V +25C Fault Trip Threshold -25 RL = 1k 0.1 V- - 400 V+ + 400 mV LOGIC INPUT Input Logic Voltage High ANALOG SWITCH Input Logic Voltage Low Input Logic Current VA_H, VENH 2.4 V VA_L, VENL IA_, IEN VA_ = VEN = 0.8V or 2.4V -1 0.8 V 1 A SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time tON VCOM_ = 10V, RL = 2k, Figure 3 +25C Enable Turn-Off Time tOFF VCOM_ = 10V, RL = 2k, Figure 3 +25C Break-Before-Make Time Delay tBBM VCOM_ = 10V, RL = 2k, Figure 4 +25C CL = 1nF, VNO_ = 0, RS = 0, Figure 5 +25C Charge Injection (Note 7) Q 220 C, E 500 700 100 C, E 250 350 50 100 2 ns ns ns 10 pC Off-Isolation (Note 8) VISO RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 6 -62 dB Channel-to-Channel Crosstalk (Note 9) VCT RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 7 -65 dB _______________________________________________________________________________________ 5 MAX4534/MAX4535 ELECTRICAL CHARACTERISTICS--Single +12V Supply (continued) ELECTRICAL CHARACTERISTICS--Single +12V Supply (continued) (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 = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS 36 V 75 150 POWER SUPPLY Power-Supply Range V+ 9 +25C All VA__ = VEN = 0 or 12V V+ Supply Current C, E I+ 250 +25C All VA__ = VEN = 5V 150 A 275 C, E A 375 Algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. RON = RON(MAX) - RON(MIN). Leakage parameters are 100% tested at maximum-rated hot temperature and guaranteed by correlation at TA = 25C. NO_ pins are fault protected, and COM_ pins are not fault protected. The max input voltage, on NO_ pins, depends upon 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. Note 3: Note 4: Note 5: Note 6: Typical Operating Characteristics (V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.) ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) V+ = +4.5V V- = -4.5V 800 V+ = +9V 1000 600 900 V+ = +15V V- = -15V 500 +125C 800 V+ = +10V V- = -10V RON () 600 V+ = +15V V- = -15V 500 V+ = +12V V+ = +15V 700 400 600 V+ = +20V 500 300 200 200 V+ = +20V V- = -20V 100 +25C -40C -15 -10 -5 0 VCOM (V) 5 10 15 20 -55C 100 V+ = +36V 0 0 -20 +70C 200 100 0 300 V+ = +30V 400 300 +85C 400 RON () 700 6 1100 MAX4534 toc02 900 MAX4534 toc01 1000 ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) MAX4534 toc03 ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) RON () MAX4534/MAX4535 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 0 5 10 15 20 VCOM (V) 25 30 35 40 -15 -10 -5 0 VCOM (V) _______________________________________________________________________________________ 5 10 15 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 10n +25C 500 -40C 2 ICOM_ON 1n ICOM_OFF 100p 400 -55C 300 10p -1 1p V+ = +12V V- = 0 100 0 INO_OFF 200 0 2 4 6 8 VCOM (V) 10 12 14 -3 -55 ENABLE ON/OFF-TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES) -5 20 45 70 95 120 145 150 100 200 50 0 0 4 6 8 10 12 14 16 18 20 tON 120 100 80 tOFF 60 tON 40 tOFF 20 0 0 5 10 15 20 25 30 35 -40 -20 0 20 40 60 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) TEMPERATURE (C) POWER-SUPPLY CURRENT vs. TEMPERATURE (VAO = VA1 = VEN = 0) POWER-SUPPLY CURRENT vs. TEMPERATURE (VAO = VA1 = VEN = 5V) POWER-SUPPLY CURRENT vs. LOGIC VOLTAGE (VA_, VEN) I+ 300 50 I+, I-, IGND (A) 100 IGND 0 -50 -100 I- -150 I+ 200 100 0 0 20 40 TEMPERATURE (C) 60 80 I+ 50 I- 0 -300 -20 150 IGND -200 -250 200 100 -100 -200 -40 V+ = 12V V- = 0 250 +I, -I, GND (A) 150 400 80 300 MAX4534 toc11 500 MAX4534 toc10 200 15 160 100 250 I+, I-, IGND (A) 250 50 10 180 140 300 150 tOFF 5 200 tON, tOFF (ns) tON 0 ENABLE ON/OFF-TIMES vs. TEMPERATURE 400 tON, tOFF (ns) tON, tOFF (ns) 200 -5 ENABLE ON/OFF-TIMES vs. SUPPLY VOLTAGE (SINGLE SUPPLY) 350 250 -10 VNO (V) 450 300 -15 TEMPERATURE (C) MAX4534 toc08 350 -30 500 MAX4534 toc07 400 V+ = 12V V- = 0 -2 0.1p 0 V+ = +15V V- = -15V 1 MAX4534 toc09 LEAKAGE (A) +70C 600 3 Q (pC) 700 MAX4534 toc6 100n +85C 4 MAX4508/09toc05 +125C 800 RON () 1 MAX4534 toc04 1000 900 CHARGE INJECTION vs. VNO (DUAL AND SINGLE SUPPLIES) LEAKAGE CURRENT vs. TEMPERATURE MAX4534 toc12 ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) -40 -20 0 20 40 TEMPERATURE (C) 60 80 0 2 4 6 8 10 12 14 VA_, VEN (V) _______________________________________________________________________________________ 7 MAX4534/MAX4535 Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.) Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.) LOGIC-LEVEL THRESHOLD vs. SUPPLY VOLTAGE FREQUENCY RESPONSE BANDWIDTH -10 300 -30 LOSS (dB) I+ 200 100 IGND 0 -100 -50 CROSSTALK -70 I- OFF-ISOLATION -90 -250 2 4 6 8 10 12 14 DUAL SUPPLIES 2.0 SINGLE SUPPLY 1.5 1.0 0 0.01 0.1 1 10 100 FREQUENCY (MHz) VA_, VEN (V) FAULT-FREE SIGNAL PERFORMANCE IN_ 0 5 10 15 20 +25V IN_ 0 10V/div -15V 0 +15V +15V COM_ -25V 0 0 10V/div 0 COM_ -15V -15V 5s/div FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING WITH 15V SUPPLIES 8 25 SUPPLY VOLTAGE (V) INPUT OVERVOLTAGE vs. OUTPUT CLAMPING MAX4534toc16 +15V 1000 MAX4534toc17 0 V- = 0 2.5 0.5 -110 -300 3.0 LOGIC-LEVEL THRESHOLD (V) 400 MAX4534 toc14 10 MAX4534 toc13 500 MAX4534toc15 POWER-SUPPLY CURRENT vs. LOGIC VOLTAGE (VA_, VEN) +I, -I, GND (A) MAX4534/MAX4535 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers 5s/div 25V OVERVOLTAGE INPUT WITH THE OUTPUT CLAMPED AT 15V _______________________________________________________________________________________ 30 35 40 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534 (Single 4-to-1 Mux) PIN NAME MAX4535 (Dual 2-to-1 Mux) PIN FUNCTION NAME FUNCTION 1 A0 Address Bit 0 1 A0 Address Bit 0 2 EN Enable Input 2 EN Enable Input 3 V- Negative Supply Voltage 3 V- Negative Supply Voltage 4 NO1 Channel Input 1 (fault protected) 4 NO1A Channel Input 1A (fault protected) 5 NO2 Channel Input 2 (fault protected) 5 NO2A Channel Input 2A (fault protected) 6, 8, 9 N.C. No connection 6, 9, 14 N.C. No connection 7 COM Analog Output 7 COMA Mux Output A 10 NO4 Channel Input 4 (fault protected) 8 COMB Mux Output B 11 NO3 Channel Input 3 (fault protected) 10 NO2B Channel Input 2B (fault protected) 12 V+ Positive Supply Voltage 11 NO1B Channel Input 1B (fault protected) 13 GND Ground 12 V+ 14 A1 Address Bit 1 13 GND Truth Tables MAX4534 (Single 4-to-1 Mux) A1 A0 EN ON SWITCH X X 0 None 0 0 1 NO1 0 1 1 NO2 1 0 1 NO3 1 1 1 NO4 X = Don't care; logic 0: VAL +0.8; logic 1: VAH +2.4V MAX4535 (Dual 2-to-1 Mux) A0 EN COMA COMB X 0 None None 0 1 NO1A NO1B 1 1 NO2A NO2B X = Don't care; logic 0: VAL +0.8; logic 1: VAH +2.4V Detailed Description The MAX4534/MAX4535 differ considerably from traditional fault-protected multiplexers, offering several advantages. First, they are constructed with two parallel 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- Positive Supply Voltage Ground to-rail signal operation. Third, when a signal on VNO_ exceeds the supply rails (i.e., a fault condition), the voltage on COM_ is limited to the supply rails. Operation is identical for both fault polarities. When the NO_ voltage goes beyond supply rails (fault condition), the NO_ input becomes high impedance regardless of the switch state or load resistance. When power is removed, and the fault protection is still in effect, the NO_ terminals are a virtual open circuit. The fault can be up to 40V, with V+ = V- = 0. If the switch is on, the COM_ output current is furnished from the V+ or V- pin by "booster" FETs connected to each supply pin. These FETs can source or sink up to 10mA. The COM_ pins are not fault-protected. If a voltage source is connected to any COM_ pin, it should be limited to the supply voltages. Exceeding the supply voltage will cause high currents to flow through the ESD protection diodes, damaging the device (see Absolute Maximum Ratings). Figure 1 shows the internal construction, with the analog signal paths shown in bold. A single, normally open (NO) switch is shown. The analog switch is formed by the parallel combination of N-channel FET N1 and Pchannel FET P1, which are driven on and off simultaneously, according to the input fault condition and the logic level state. . _______________________________________________________________________________________ 9 MAX4534/MAX4535 Pin Descriptions MAX4534/MAX4535 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers NORMALLY OPEN SWITCH CONSTRUCTION V+ P2 HIGH FAULT P1 NO_ COM_ N1 LOW FAULT ON A_ MAX4534 MAX4535 GND N2 VESD DIODE Figure 1. Functional Diagram NO_ Input Voltage The maximum allowable input voltage for safe operation depends on whether supplies are on or off and on the load configuration at the COM output. If COM is referred to a voltage other than ground, but within the supplies, VNO_ may range higher or lower than the supplies, provided the absolute value of VNO_ VCOM_ is less than 40V. For example, if the load is referred to +10V at COM_, then the NO_ voltage range can be from +50V to -30V. As another example, if the load is connected to -10V at COM_, the NO_ voltage range is limited to -50V to +30V. If the supplies are 15V and COM is referenced to ground through a load, the maximum NO_ voltage is 36V. If the supplies are off and the COM output is referenced to ground, the maximum NO_ voltage is 40V. Normal Operation Two comparators continuously compare the voltage on the NO_ pin with V+ and V- supply voltages. When the signal on NO_ is between V+ and V-, the multiplexer behaves normally, with FETs N1 and P1 turning on and 10 off in response to A_ signals (Figure 1). The parallel combination of N1 and P1 forms a low-value resistor between NO_ and COM_ so that signals pass equally well in either direction. Positive Fault Condition When the signal on NO_ exceeds V+ by about 150mV, the positive fault comparator output goes high, turning off FETs N1 and P1 (Figure 1). This makes the NO_ pin high impedance regardless of the switch state. If the switch state is "off," all FETs turn off, and both NO_ and COM_ are high impedance. If the switch state is "on," FET P2 turns on, clamping COM_ to V+. Negative Fault Condition When the signal on NO_ goes about 150mV below V-, the negative fault comparator output goes high, turning off FETs N1 and P1 (Figure 1). This makes the NO pin high impedance regardless of the switch state. If the switch state is "off," all FETs turn off, and both NO_ and COM_ are high impedance. If the switch state is "on," FET N2 turns on, clamping COM_ to V-. ______________________________________________________________________________________ Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers Non-Fault-Protected Pins FETs N2 and P2 can source about 10mA from V+ or V- to the COM_ pin in the fault condition (Figure 1). Ensure that if the COM_ pin is connected to a low impedance load, the 30mA absolute maximum current rating is never exceeded, both in normal and fault conditions. The GND, COM_, EN, and A_ pins do not have fault protection. Reverse ESD protection diodes are internally connected between GND, COM_, A_, EN, and both V+ and V-. If a signal on GND, COM_, EN, or A_ exceeds V+ or V- by more than 300mV, one of these diodes will conduct. During normal operation, these reverse-biased ESD diodes leak a few nanoamps of current to V+ and V-. Applications Information Ground There is no connection between the analog signal paths and GND. The analog signal paths consist of an N-channel and a P-channel MOSFET with their sources and drains paralleled, and their gates driven out of phase to V+ and V- by the logic-level translators. V+ and GND power the internal logic and logic-level translators and set the input logic thresholds. The logiclevel translators convert the logic levels to switched V+ and V- signals to drive the gates of the channel MOSFETs. This drive signal is the only connection between the power supplies and the analog signals. GND, A_, EN, and COM_ have ESD protection diodes to V+ and V-. Supply Current Reduction When the logic signals are driven rail-to-rail from 0 to +15V or -15V to +15V, the current consumption will be reduced from 300A (typ) to 180A. Power Supplies The MAX4534/MAX4535 operate with bipolar supplies between 4.5V and 20V. The V+ and V- supplies need not be symmetrical, but their sum cannot exceed the 44V absolute maximum rating. The MAX4534/MAX4535 operate from single supplies between +9V and +36V when V- is connected to GND. 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 compatible with V+ = 4.5V to 16.5V. ______________________________________________________________________________________ 11 MAX4534/MAX4535 Transient Fault Condition When a fast rising or falling transient on NO_ exceeds V+ or V-, the output (COM_) follows the input (NO_) to the supply rail with only a few nanoseconds delay. This delay is due to the switch on-resistance and circuit capacitance to ground. When the input transient returns to within the supply rails, however, there is a longer output recovery time. For positive faults, the recovery time is typically 2.5s. For negative faults, the recovery time is typically 1.3s. These values depend on the COM_ output resistance and capacitance. The delays do not depend on the fault amplitude. Higher COM_ output resistance and capacitance increase the recovery times. Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535 Test Circuits/Timing Diagrams V+ V+ NO1 A1 +10V NO2, NO3 A0 MAX4534 +5V NO4 EN -10V COM GND VOUT V- 35pF LOGIC INPUT VA_ 50% 0 RL V- VNO__ V+ V+ 90% SWITCH OUTPUT VOUT +10V NO1B A0 tR < 20ns tF < 20ns +3V 90% VNO__ NO1A, NO2A +5V EN -10V NO2B MAX4535 GND tTRANS tTRANS COMB V- ON VOUT 35pF RL V- Figure 2. Address Transition Time V+ VEN V+ EN NO1 +10V NO2-NO4 A0 A1 MAX4534 COM GND 50 VOUT V- 35pF RL LOGIC INPUT VEN V- V+ EN 50% 0 tON(EN) tOFF(EN) 10V V+ VEN tR < 20ns tF < 20ns +3V NO1B 90% SWITCH OUTPUT VOUT +10V NO1A, NO2A NO2B, COMA A0 0 MAX4535 50 GND COMB V- VOUT RL 35pF V- Figure 3. Enable Switching Time 12 ______________________________________________________________________________________ 90% Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers V+ VEN +3V V+ EN NO1-NO4 A0 +10V tR < 20ns tF < 20ns +3V LOGIC INPUT VA 50% 0 MAX4534 80% A1 COM GND SWITCH OUTPUT VOUT VOUT V- 35pF tOPEN RL 50 V- Figure 4. MAX4534 Break-Before-Make Interval V+ RS V+ NO_ VEN VS MAX4534 A0 CHANNEL SELECT LOGIC INPUT VEN EN COM +3V ON OFF ON 0 VOUT A1 GND CL 1nF V- VOUT VOUT VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF. VQ = VOUT CL Figure 5. Charge Injection V+ NO1 VIN RS = 50 V+ 10nF NO1 V+ NO4 R 1k MAX4534 COM A0 VIN VOUT V+ NO2 NO4 MAX4534 A0 COM VOUT RS = 50 A1 GND EN V- RL 50 A1 GND EN V- RL 50 10nF 10nF V- VOFF-ISOLATION = 20log Figure 6. Off-Isolation 10nF VOUT VIN CROSSTALK = 20log VOUT VIN Figure 7. Crosstalk ______________________________________________________________________________________ 13 MAX4534/MAX4535 Test Circuits/Timing Diagrams (continued) MAX4534/MAX4535 Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers Test Circuits/Timing Diagrams (continued) V+ VNO_ V+ NO4 MAX4534 A0 GND EN VCOM_ NO1 A1 CHANNEL SELECT +25V V- +15V 1MHz CAPACITANCE ANALYZER -15V COM -25V V- Figure 9. Transient Behavior of Fault Condition Figure 8. NO_, COM_ Capacitance ___________________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 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.