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19-1609; Rev 0; 1/00
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers
General Description
The MAX4534 (single 4-to-1) and MAX4535 (dual 2-to-1) fault-protected multiplexers operate with 4.5V to 20V dual supplies or a +9V to +36V single supply. These multiplexers feature fault-protected inputs, Rail-to-Rail(R) 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.
Features
o 40V Fault Protection with Power Off 25V Fault Protection with 15V Supplies o No Power-Supply Sequencing Required o All Channels Off with Power Off o Rail-to-Rail Signal Handling o Output Clamped to Appropriate Supply Voltage During Fault Condition o 1.0k typ Output Clamp Resistance During Overvoltage o 400 max On-Resistance o 20ns typ Fault Response Time o 4.5V to 20V Dual Supplies +9V to +36V Single Supply o TTL/CMOS-Compatible Logic Inputs
MAX4534/MAX4535
Applications
Data-Acquisition Systems Industrial and Process Control Avionics Signal Routing Redundant/Backup Systems
Pin Configurations
PART
TOP VIEW MAX4534
A0 1 EN 2 V- 3 NO1 4 NO2 5 N.C. 6 COM 7 LOGIC 14 A1 13 GND 12 V+ 11 NO3 10 NO4 9 8 N.C. N.C.
Ordering Information
TEMP. RANGE 0C to +70C 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 MAX4534CUD MAX4534CSD MAX4534CPD MAX4534EUD MAX4534ESD MAX4534EPD MAX4535CUD MAX4535CSD MAX4535CPD MAX4535EUD MAX4535ESD MAX4535EPD
TSSOP/SO/DIP MAX4535
A0 1 EN 2 V- 3 NO1A 4 NO2A 5 N.C. 6 COMA 7 LOGIC 14 N.C. 13 GND 12 V+ 11 NO1B 10 NO2B 9 N.C. 8 COMB
TSSOP/SO/DIP
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
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 ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance On-Resistance Match Between Channels (Note 4) NO_ Off-Leakage Current (Note 5) VNO_ RON RON INO_(OFF) Applies with power on or off VCOM_ = 10V, INO_ = 1mA VCOM_ = 10V, INO_ = 1mA - VNO_ = 10V, VCOM_ = +10V MAX4534 COM_ Off-Leakage Current (Note 5) ICOM_(OFF) VCOM_ = 10V, - VNO_ = +10V MAX4535 MAX4534 COM_ On-Leakage Current (Note 5) FAULT PROTECTION Fault-Protected Analog Signal Range (Note 6) COM_ Output Leakage Current, Supplies On 2 VNO_ ICOM_ Applies with power on Applies with power off VNO_ = 25V, VEN = 0, VCOM_ = 0 +25C C, E -25 -40 -20 -1 +25 +40 20 1 nA nA A ICOM_(ON) VCOM_ = 10V, VNO_ = floating MAX4535 +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E 2 V275 V+ 400 500 10 15 0.5 5 0.05 0.05 0.1 0.1 2 20 1 10 2 25 1 15 nA nA V nA SYMBOL CONDITIONS TA MIN TYP MAX UNITS
-0.5
-5 -2 -20 -1 -10 -2 -25 -1 -15
0.01
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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 NO_ Input Leakage Current, Supplies On NO_ Input Leakage Current, Supplies Off COM_ On Clamp Output Current, Supplies On COM_ On Clamp Output Resistance, Supplies On Fault Response Time Fault Recovery Time Fault Trip Threshold LOGIC INPUT Input Logic Voltage High Input Logic Voltage Low Input Logic Current VA_H, VENH VA_L, VENL IA_, IEN VA_= VEN = 0.8V or 2.4V -1 2.4 0.8 1 V V A SYMBOL INO_ INO_ ICOM_ RCOM_ CONDITIONS - VNO_= 25V, VCOM_ = +10V, VEN = 0 VNO_= 40V, VCOM_ = 0, V+ = 0, V- = 0 VNO_ = +25V VCOM_ = 0 VNO_ = -25V VCOM_ = 0 VNO_ = 25V RL = 10k, VNO_ = 25V RL = 10k, VNO_ = 25V RL = 1k V- - 400 TA +25C C, E +25C C, E +25C +25C C, E MIN -20 -200 -20 -5 7 -13 0.1 0.08 20 2.5 V+ + 400 10 -11 1.0 TYP MAX 20 200 20 5 13 -7 2.5 3 UNITS nA nA A mA k ns s mV
MAX4534/MAX4535
SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time Enable Turn-Off Time Transition Time Break-Before-Make Time Delay Charge Injection (Note 7) Off-Isolation (Note 8) Channel-to-Channel Crosstalk (Note 9) NO_ Off-Capacitance COM_ Off-Capacitance COM_ On-Capacitance tON tOFF tTRANS tBBM Q VISO VCT VNO_ = 10V, RL = 1k, Figure 3 VNO_ = 10V, RL = 1k, Figure 3 Figure 2 VNO_ = 10V, RL = 1k, Figure 4 CL = 1nF, VNO_ = 0, RS = 0, Figure 5 RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 6 RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 7 MAX4534 MAX4535 MAX4534 MAX4535 +25C C, E +25C C, E +25C C, E 10 60 1 62 53 5 6.5 4 13.5 10.5 10 130 60 135 275 400 200 250 350 500 ns ns ns ns pC dB dB pF pF pF
CNO_(OFF) f = 1MHz, Figure 8 f = 1MHz, CCOM_(OFF) Figure 8 CCOM_(ON) f = 1MHz, Figure 8
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3
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
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 POWER SUPPLY Power-Supply Range V+, VAll VA_ = VEN = 0 or 5V V+ Supply Current I+ All VA_ = VEN = 0 or 15V V- Supply Current IAll VA_ = VEN = 0, 5V, or 15V All VA_ = VEN = 0 or 15V GND Supply Current IGND All VA_ = VEN = 5V +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E 100 0.01 125 125 4.5 225 20 400 600 200 300 200 300 1 10 200 300 A A A V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
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 ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance On-Resistance Match Between Channels (Note 5) NO_ Off-Leakage Current (Notes 5, 10) VNO_ RON RON INO_(OFF) Applies with power on or off VCOM_ = 10V, INO_ = 500A VCOM_ = 10V, INO_ = 500A VCOM_ = 10V, 1V; VNO_ = 1V, 10V MAX4534 MAX4535 MAX4534 MAX4535 +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E +25C C, E 10 0 650 V+ 950 1100 25 40 0.5 10 2 20 1 15 2 20 1 15 nA nA V nA SYMBOL CONDITIONS TA MIN TYP MAX UNITS
-0.5
-10
0.01
-2
-20
COM_ Off-Leakage Current (Notes 5, 10)
VCOM_ = 10V, ICOM_(OFF) 1V; VNO_ = 1V,10V VCOM_ = 10V, 1V; ICOM_(ON) VNO_ = 10V, 1V, or floating
-1
-15
-2
-20
COM_ On-Leakage Current (Notes 5, 10)
-1
-15
4
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Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers
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 FAULT PROTECTION Fault-Protected Analog Signal Range (Note 6) COM_ Output Leakage Current, Supply On NO_ Input Leakage Current, Supply On NO_ Input Leakage Current, Supply Off COM_ ON Output Current, Supply On COM_ ON Output Resistance, Supply On Fault Trip Threshold LOGIC INPUT Input Logic Voltage High Input Logic Voltage Low Input Logic Current VA_H, VENH VA_L, VENL IA_, IEN VA_= VEN = 0.8V or 2.4V VCOM_ = 10V, RL = 2k, Figure 3 VCOM_ = 10V, RL = 2k, Figure 3 VCOM_ = 10V, RL = 2k, Figure 4 CL = 1nF, VNO_ = 0, RS = 0, Figure 5 RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 6 RL = 50, VNO_ = 1VRMS, f = 1MHz, Figure 7 +25C C, E +25C C, E +25C +25C 50 100 2 -62 -65 10 100 -1 220 2.4 0.8 1 500 700 250 350 V V A VNO_ ICOM_ INO_ INO_ ICOM_ RCOM_ Applies with all power on Applies with all power off VNO_ = 25V, VCOM = 0 VNO_ = 25V, VCOM_ = 0, VNO_= 40V, V+ = 0 VNO_ = 25V VNO_ = 25V RL = 1k +25C +25C C, E +25C C, E +25C C, E +25C +25C V- - 400 -25 -40 -20 -1 -20 -5 -20 -5 2 3 2.4 0.1 25 40 20 1 20 5 20 5 5 6 V+ + 400 V nA A nA A nA A nA k mV SYMBOL CONDITIONS TA MIN TYP MAX UNITS
MAX4534/MAX4535
SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time Enable Turn-Off Time Break-Before-Make Time Delay Charge Injection (Note 7) Off-Isolation (Note 8) Channel-to-Channel Crosstalk (Note 9) tON tOFF tBBM Q VISO VCT ns ns ns pC dB dB
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5
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
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 POWER SUPPLY Power-Supply Range V+ All VA__ = VEN = 0 or 12V V+ Supply Current I+ All VA__ = VEN = 5V Note 3: Note 4: Note 5: Note 6: +25C C, E +25C C, E 150 9 75 36 150 250 275 375 A A V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
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.
Typical Operating Characteristics
(V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
MAX4534 toc01
ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
MAX4534 toc02
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
V+ = +15V V- = -15V +125C +85C
MAX4534 toc03
1000 900 800 700 RON () 600 500 400 300 200 100 0 -20 -15 -10 -5 0 VCOM (V) 5 10 15 V+ = +20V V- = -20V V+ = +15V V- = -15V V+ = +4.5V V- = -4.5V V+ = +10V V- = -10V
1100 1000 900 800 700 RON () 600 500 400 300 200 100 0 V+ = +36V V+ = +12V V+ = +15V V+ = +20V V+ = +30V V+ = +9V
600 500 400 RON () 300 200
+70C +25C -40C -55C
100 0
20
0
5
10
15
20 VCOM (V)
25
30
35
40
-15
-10
-5
0 VCOM (V)
5
10
15
6
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Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.)
MAX4534/MAX4535
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
MAX4534 toc04
LEAKAGE CURRENT vs. TEMPERATURE
MAX4508/09toc05
CHARGE INJECTION vs. VNO (DUAL AND SINGLE SUPPLIES)
MAX4534 toc6
1000 900 800 700 RON () 600 500 400 300 200 100 0 0 2 4 6 8 VCOM (V) 10 12 V+ = +12V V- = 0 -55C +85C +70C +25C -40C +125C
1 100n 10n LEAKAGE (A)
4 3 2 Q (pC)
1n
ICOM_ON ICOM_OFF
1 0 -1 -2 -3
V+ = +15V V- = -15V
100p 10p 1p 0.1p
INO_OFF
V+ = 12V V- = 0
14
-55
-30
-5
20
45
70
95
120 145
-15
-10
-5
0 VNO (V)
5
10
15
TEMPERATURE (C)
ENABLE ON/OFF-TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES)
MAX4534 toc07
ENABLE ON/OFF-TIMES vs. SUPPLY VOLTAGE (SINGLE SUPPLY)
MAX4534 toc08
ENABLE ON/OFF-TIMES vs. TEMPERATURE
180 160 140 tON, tOFF (ns) 120 100 80 60 40 tOFF tON
MAX4534 toc09
400 350 300 tON, tOFF (ns)
500 450 400 350 tON, tOFF (ns)
200
250 200 150 100 50 0 4 6 8 10 12 14 16 18 20 tOFF tON
300 250 200 150 100 50 0 0 5 10 15 20 25 30 35 tOFF tON
20 0 -40 -20 0 20 40 60 80
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
POWER-SUPPLY CURRENT vs. TEMPERATURE (VAO = VA1 = VEN = 0)
MAX4534 toc10
POWER-SUPPLY CURRENT vs. TEMPERATURE (VAO = VA1 = VEN = 5V)
MAX4534 toc11
POWER-SUPPLY CURRENT vs. LOGIC VOLTAGE (VA_, VEN)
V+ = 12V V- = 0
MAX4534 toc12
250 200 150 I+, I-, IGND (A) 100 50 0 -50 -100 -150 -200 -250 -40 -20 0 20 40 60 80 TEMPERATURE (C) IIGND I+
500 400 300 I+, I-, IGND (A) 200 100 0 -100 -200 -300 -40 -20 0 20 40 60 80 TEMPERATURE (C) IGND II+
300 250 +I, -I, GND (A) 200 150 I+ 100 50 0 0 2 4 6 8 10 12 14 VA_, VEN (V)
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Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.)
POWER-SUPPLY CURRENT vs. LOGIC VOLTAGE (VA_, VEN)
MAX4534 toc13
FREQUENCY RESPONSE
MAX4534 toc14
LOGIC-LEVEL THRESHOLD vs. SUPPLY VOLTAGE
V- = 0
MAX4534toc15
500 400 300 +I, -I, GND (A)
10 -10 -30 LOSS (dB) -50 CROSSTALK -70 BANDWIDTH
3.0 2.5 2.0 1.5 1.0 0.5 0
LOGIC-LEVEL THRESHOLD (V)
200 100 0 -100 -250 -300 0 2 4 6 8 10
I+
DUAL SUPPLIES SINGLE SUPPLY
IGND I-
-90 -110 12 14 0.01 0.1
OFF-ISOLATION
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
MAX4534toc16
INPUT OVERVOLTAGE vs. OUTPUT CLAMPING
+25V IN_ 0 +15V -25V 0 COM_ -15V
MAX4534toc17
+15V IN_ 0 10V/div -15V +15V COM_ 0 10V/div -15V 5s/div FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING WITH 15V SUPPLIES
0
5s/div 25V OVERVOLTAGE INPUT WITH THE OUTPUT CLAMPED AT 15V
8
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Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers
Pin Descriptions
MAX4534 (Single 4-to-1 Mux)
PIN 1 2 3 4 5 6, 8, 9 7 10 11 12 13 14 NAME A0 EN VNO1 NO2 N.C. COM NO4 NO3 V+ GND A1 Enable Input Negative Supply Voltage Channel Input 1 (fault protected) Channel Input 2 (fault protected) No connection Analog Output Channel Input 4 (fault protected) Channel Input 3 (fault protected) Positive Supply Voltage Ground Address Bit 1 FUNCTION Address Bit 0
MAX4534/MAX4535
MAX4535 (Dual 2-to-1 Mux)
PIN 1 2 3 4 5 6, 9, 14 7 8 10 11 12 13 NAME A0 EN VNO1A NO2A N.C. COMA COMB NO2B NO1B V+ GND Enable Input Negative Supply Voltage Channel Input 1A (fault protected) Channel Input 2A (fault protected) No connection Mux Output A Mux Output B Channel Input 2B (fault protected) Channel Input 1B (fault protected) Positive Supply Voltage Ground FUNCTION Address Bit 0
Truth Tables MAX4534 (Single 4-to-1 Mux)
A1 X 0 0 1 1 A0 X 0 1 0 1 EN 0 1 1 1 1 ON SWITCH None NO1 NO2 NO3 NO4
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. .
X = Don't care; logic 0: VAL +0.8; logic 1: VAH +2.4V
MAX4535 (Dual 2-to-1 Mux)
A0 X 0 1 EN 0 1 1 COMA None NO1A NO2A COMB None NO1B 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-
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9
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
NORMALLY OPEN SWITCH CONSTRUCTION V+ P2
HIGH FAULT P1 NO_ LOW FAULT COM_
N1
A_
ON
MAX4534 MAX4535 GND
VESD DIODE
N2
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.
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-.
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
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Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers
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.
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-.
MAX4534/MAX4535
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-.
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
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
Test Circuits/Timing Diagrams
V+ V+ A1 A0 NO1 NO2, NO3 +10V
MAX4534
+5V EN GND V-
NO4 COM
-10V VOUT 35pF RL LOGIC INPUT VA_ +3V 50% 0 VNO__ SWITCH OUTPUT VOUT 90% VNO__ -10V VOUT RL 35pF tTRANS
ON
tR < 20ns tF < 20ns
VV+ V+ A0 NO1B NO1A, NO2A +10V
90%
+5V
MAX4535
EN GND
NO2B COMB V-
tTRANS
V-
Figure 2. Address Transition Time
V+ VEN V+ NO1 NO2-NO4 A0 A1 +10V
EN
MAX4534
COM VOUT RL VV+ SWITCH OUTPUT VOUT 35pF LOGIC INPUT VEN +3V 50% 0 tON(EN) 10V 90% 90% NO1B tR < 20ns tF < 20ns tOFF(EN)
50
GND
V-
VEN
EN
V+
+10V
NO1A, NO2A NO2B, COMA A0
0
MAX4535
50 GND COMB VRL VVOUT 35pF
Figure 3. Enable Switching Time 12 ______________________________________________________________________________________
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers
Test Circuits/Timing Diagrams (continued)
V+ VEN V+ NO1-NO4 A0 LOGIC INPUT VA +3V 50% 0
MAX4534/MAX4535
+3V
EN
tR < 20ns tF < 20ns
+10V
MAX4534
80% SWITCH OUTPUT VOUT
A1 GND 50 VV-
COM RL
VOUT 35pF
tOPEN
Figure 4. MAX4534 Break-Before-Make Interval
V+ RS NO_ VEN VS CHANNEL SELECT EN A0 A1 CL 1nF VOUT VOUT VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF. VQ = VOUT CL V+ LOGIC INPUT VEN COM VOUT +3V ON 0 OFF ON
MAX4534
GND
V-
Figure 5. Charge Injection
V+ 10nF V+ 10nF
VIN RS = 50
NO1 NO4
V+ R 1k COM VOUT RS = 50 RL 50 VIN
NO1 NO2 NO4 A0 A1
V+
MAX4534
A0 A1 GND EN 10nF VOFF-ISOLATION = 20log VOUT VIN V-
MAX4534
COM
VOUT RL 50
GND EN 10nF
V-
VCROSSTALK = 20log
VOUT VIN
Figure 6. Off-Isolation
Figure 7. Crosstalk 13
______________________________________________________________________________________
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
Test Circuits/Timing Diagrams (continued)
V+ V+ A1 CHANNEL SELECT A0 GND EN VVVNO_ NO1 NO4 COM 1MHz CAPACITANCE ANALYZER -15V +25V +15V VCOM_
MAX4534
-25V
Figure 8. NO_, COM_ Capacitance
Figure 9. Transient Behavior of Fault Condition
___________________Chip Information
TRANSISTOR COUNT: 265
14
______________________________________________________________________________________
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers
Package Information
MAX4534/MAX4535
______________________________________________________________________________________
15
Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers MAX4534/MAX4535
Package Information (continued)
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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