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19-1452; Rev 0; 4/99
Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch
General Description
The MAX4533 quad, single-pole/double-throw (SPDT), fault-protected analog switch is pin-compatible with the industry-standard MAX333 and MAX333A. The MAX4533 features fault-protected inputs and Rail-to-Rail(R) signal handling. The normally open (NO_ ) and normally closed (NC_ ) terminals are protected from overvoltage faults up to 25V with power on and up to 40V with power off. During a fault condition, NO_ and NC_ become high impedance with only nanoamperes of leakage current flowing to the source. In addition, the output (COM_) clamps to the appropriate polarity supply rail and provides up to 10mA of load current. This ensures unambiguous rail-to-rail outputs when a fault occurs. The MAX4533 operates from dual 4.5V to 18V power supplies or a single +9V to +36V supply. All digital inputs have +0.8V and +2.4V logic thresholds, ensuring both TTL and CMOS logic compatibility when using 15V supplies or a +12V supply. On-resistance is 175 max and is matched between switches to 10 max. The offleakage current is only 0.5nA at TA = +25C and 10nA at TA = +85C. o Rail-to-Rail Signal Handling o 40V Fault Protection with Power Off 25V Fault Protection with 15V Supplies o All Switches Off with Power Off o No Power-Supply Sequencing Required During Power-Up or Power-Down o Output Clamped to Appropriate Supply Voltage During Fault Condition--No Transition Glitch o 1k (typ) Output Clamp Resistance During Overvoltage o 175 (max) Signal Paths with 15V Supplies o 20ns (typ) Fault Response Time o 4.5V to 18V Dual Supplies +9V to +36V Single Supply o Pin-Compatible with Industry-Standard MAX333/MAX333A o TTL/CMOS-Compatible Logic Inputs with 15V or Single +9V to +15V Supplies
Features
MAX4533
Applications
Redundant/Backup Systems Test Equipment Communications Systems Industrial and Process Control Portable Instruments Data-Acquisition Systems Avionics Systems
Ordering Information
PART MAX4533CAP TEMP. RANGE 0C to +70C PIN-PACKAGE 20 SSOP
MAX4533CSP 0C to +70C 20 Wide SO Ordering Information continued at end of data sheet.
Typical Operating Circuit
INPUTS V1 V2 OUTPUTS V1 - V2
Pin Configuration/ Functional Diagram
TOP VIEW
IN1 1 NO1 2 20 IN4 19 NO4 18 COM4 17 NC4 16 V+
OSC IN
COM1 3 NC1 4
MAX4533
V- 5 GND 6
MAX4533
15 N.C. 14 NC3 13 COM3 12 NO3 11 IN3
V3 V4 FLYING CAPACITOR LEVEL TRANSLATOR (2-CHANNEL)
V3 - V4
NC2 7 COM2 8 NO2 9 IN2 10
SSOP/SO/DIP/CERDIP
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Patent Pending
SWITCHES ARE SHOWN WITH LOGIC "0" INPUT N.C. = NOT INTERNALLY CONNECTED
________________________________________________________________ Maxim Integrated Products
1
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Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND V+ ........................................................................-0.3V to +44.0V V- .........................................................................-44.0V to +0.3V V+ to V-................................................................-0.3V to +44.0V COM_, IN_ (Note 1) ............................. (V- - 0.3V) to (V+ + 0.3V) NC_, NO_ (Note 2)..................................(V+ - 40V) to (V- + 40V) NC_, NO_ to COM_ .................................................-40V to +40V NC_, NO_ Overvoltage with Switch Power On (supplies at 15V) ................................................-30V to +30V NC_, NO_ Overvoltage with Switch Power Off ........-40V to +40V Continuous Current into Any Terminal..............................30mA Peak Current into Any Terminal (pulsed at 1ms,10% duty cycle)....................................50mA Continuous Power Dissipation (TA = +70C) SSOP (derate 10.53mW/C above +70C) ...................842mW Wide SO (derate 10.00mW/C above +70C).............. 800mW Plastic DIP (derate 11.11mW/C above +70C) ...........889mW CERDIP (derate 11.11mW/C above +70C) ................889mW Operating Temperature Ranges MAX4533C_ _ ......................................................0C to +70C MAX4533E_ _ ...................................................-40C to +85C MAX4533M_ _.................................................-55C to +125C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: COM_ and IN_ pins are not fault protected. Signals on COM_ or IN_ exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum current rating. Note 2: NC_ and NO_ pins are fault protected. Signals on NC_ or NO_ exceeding -25V to +25V may damage the device. These limits apply with power applied to V+ or V-. The limit is 40V with V+ = V- = 0.
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, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range (Note 2) COM_ to NO_ or COM_ to NC_ On-Resistance COM_ to NO_ or COM_ to NC_ On-Resistance Match Between Channels (Note 4) On-Resistance Flatness NO_ or NC_ Off-Leakage Current (Note 5) COM_ On-Leakage Current (Note 5) FAULT Fault-Protected Analog Signal Range (Note 2) COM_ Output Leakage Current, Supplies On NO_ or NC_ Off Input Leakage Current, Supplies On 2 VNO_, VNC_ Applies with power on Applies with power off VNO_ or VNC_ = 25V, no connection to "ON" channel VNO_ or VNC_ = 25V, VCOM_ = 10V +25C +25C +25C C, E M +25C C, E M -25 -40 -10 -200 -10 -20 -200 -10 +25 +40 10 200 10 20 200 10 V nA A nA A INO_(OFF), INC_(OFF) VNO_, VNC_ V+ = +15V, V- = -15V, VNO_ or VNC_ = 15V VNO_ or VNC_ = 10V, ICOM_ = 1mA VNO_ or VNC_ = 10V, ICOM_ = 1mA VCOM_ = +5V, 0, -5V, ICOM_ = 1mA VNO_ or VNC_ = 14V, VCOM_ = 14V C, E, M +25C C, E M +25C C, E M +25C -0.5 -10 -200 -0.5 -20 -400 4 0.02 0.5 10 200 0.5 20 400 V125 V+ 175 200 250 6 10 15 V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
RON
1
RON

ICOM_(ON)
+25C C, E M +25C VCOM_ = 14V, C, E VNO_ or VNC_= 14V or floating M
nA
ICOM_
_______________________________________________________________________________________
INO_, INC_
0.01
nA
Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch
ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)
(V+ = +15V, V- = -15V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER NO_ or NC_ Input Leakage Current, Supplies Off COM_ On-Clamp Output Current, Supplies On COM_ On-Clamp Output Resistance, Supplies On Fault Output Clamp Turn-On Delay Time (Note 6) Fault Recovery Time (Note 6) LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low VIN_H VIN_L IIN_H, IIN_L VIN_ = +0.8V or +2.4V C, E, M C, E, M +25C C, E, M +25C C, E M +25C C, E M +25C +25C +25C +25C +25C 10 -1 -5 100 0.03 2.4 0.8 1 5 250 400 600 150 300 450 V V A SYMBOL INO_, INC_ CONDITIONS VNO_ or VNC_ = 40V, V+ = 0, V- = 0 VNO_ or VNC_ = +25V VNO_ or VNC_ = -25V VNO_ or VNC = 25V RL = 10k, VNO_ or VNC_ = 25V RL = 10k, VNO_ or VNC_ = 25V TA +25C C, E M +25C +25C +25C C, E, M +25C +25C MIN -20 -200 -10 8 -12 TYP 0.1 MAX 20 200 10 13 -7 2.5 3 UNITS nA A mA k ns s
MAX4533
ICOM_ RCOM_
11 -10 1.0
20 2.5
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON VCOM_ = 10V, RL = 2k; Figure 2 VNO_ = 10V, RL = 2k; Figure 2 VCOM_ = 10V, RL = 1k; Figure 3 CL = 100pF, VCOM_ = 0; Figure 4 f = 1MHz; Figure 5 f = 1MHz; Figure 5 RL = 50, CL = 15pF, VN_ = 1VRMS, f = 1MHz; Figure 6 RL = 50, CL = 15pF, VN_ = 1VRMS, f = 1MHz; Figure 6 ns
60
Turn-Off Time
tOFF
ns
Break-Before-Make Time Delay Charge Injection (Note 6) NO_ or NC_ Off-Capacitance COM_ On-Capacitance Off-Isolation (Note 7)
tBBM Q CN_(OFF) CCOM_(ON) VISO
50 1.5 5 12 -62
ns pC pF pF dB
Channel-to-Channel Crosstalk (Note 8) POWER SUPPLY Power-Supply Range V+ Supply Current V- Supply Current GND Supply Current
VCT
+25C
-66
dB
V+, VI+ IIGND All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 +25C C, E, M +25C C, E, M +25C C, E, M
4.5
18 600 1000 400 600 300 450
V A A A
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Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533
ELECTRICAL CHARACTERISTICS--Single Supply
(V+ = +12V, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range (Note 2) COM_ to NO_, COM_ to NC_ On-Resistance COM_ -NO_ On-Resistance Match Between Channels (Note 4) NO_ or NC_ Off-Leakage Current (Notes 5, 9) COM_ On-Leakage Current (Notes 5, 9) FAULT Fault-Protected Analog Signal Range (Note 2) COM_ Output Leakage Current, Supply On (Note 9) NO_ or NC_ Off Input Leakage Current, Supply On (Note 9) NO_ or NC_ Input Leakage Current, Supply Off (Note 9) COM_ On-Clamp Output Current, Supply On COM_ On-Clamp Output Resistance, Supply On LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low VNO_, VNC_ Applies with power on Applies with power off VNO_ or VNC_ = 25V, V+ = +12V, no connection to "ON" channel VNO_ or VNC_ = 25V, VCOM_ = 0, V+ = +12V VNO_ or VNC_ = 40V, V+ = 0, V- = 0 VNO_ or VNC_ = 25V, V+ = +12V VNO_ or VNC_ = 25V, V+ = +12V +25C +25C +25C C, E M +25C C, E M +25C C, E M +25C +25C -25 -40 -10 -200 -10 -20 -200 -10 -20 -200 -10 2 +25 +40 10 200 10 20 200 10 20 200 10 5 5 V nA A nA A nA A mA k VNO_, VNC_ V+ = +12V, V- = 0, VNO_ or VNC_ = +12V or 0 V+ = +12V, VNO_ or VNC_ = +10V, ICOM_ = 1mA V+ = +12V, VNO_ or VNC_ = +10V, ICOM_ = 1mA C, E, M +25C C, E M +25C 0 260 V+ 390 450 525 10 20 30 0.5 10 200 0.5 20 400 V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
RON
4
RON
INO_(OFF), INC_(OFF)
ICOM_(ON)
C, E M +25C V+ = +12V, VCOM_ = +10V, +1V, C, E VNO_ or VNC_ = +1V, +10V M +25C V+ = +12V, VCOM_ = +10V, C, E VNO_ or VNC_= +10V or floating M
-0.5 -10 -200 -0.5 -20 -400
0.01
nA
0.01
nA
ICOM_
INO_, INC_
0.1
INO_, INC_
ICOM_ RCOM_
3 2.4
VIN_H VIN_L IIN_H, IIN_L VIN_ = +0.8V or +2.4V
C, E, M C, E, M +25C C, E, M
2.4 -1 -5 0.03 0.8 1 5
V V A
4
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Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch
ELECTRICAL CHARACTERISTICS--Single Supply (continued)
(V+ = +12V, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS VCOM_ = +10V, RL = 2k; Figure 2 VCOM_ = +10V, RL = 2k; Figure 2 VCOM_ = +10V, RL = 1k; Figure 3 CL = 100pF, VCOM_ = 0; Figure 4 f = 1MHz; Figure 5 f = 1MHz; Figure 5 RL = 50, CL = 15pF, VNO_ = 1VRMS, f = 1MHz; Figure 6 RL = 50, CL = 15pF, VNO_ = 1VRMS, f = 1MHz; Figure 6 TA +25C C, E, M +25C C, E, M +25C +25C +25C +25C +25C 5 100 2 5 15 -62 100 MIN TYP 200 MAX 500 1000 300 900 UNITS SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Time Delay Charge Injection NO_ or NC_ Off-Capacitance COM_ On-Capacitance Off-Isolation (Note 7) tON tOFF tBBM Q CN_(OFF) CCOM_(ON) VISO ns ns ns pC pF pF dB
MAX4533
Channel-to-Channel Crosstalk (Note 8) POWER SUPPLY Power-Supply Range V+ Supply Current
VCT
+25C
-65
dB
V+ I+ All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 All VIN_ = 0 or +12V, VNO_ = VNC_ = 0 All VIN_ = 0 or +5V, VNO_ = VNC_ = 0
C, E, M +25C C, E, M +25C C, E, M +25C C, E, M
9
36 350 550 200 350 350 550
V A A A
V- and GND Supply Current
IGND
Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9:
The 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. Guaranteed by design. Off-isolation = 20log10(VCOM_ / VNO_), VCOM_ = output, VNO_ = input to off switch. Between any two analog inputs. Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
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Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533
Typical Operating Characteristics
(V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.) ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
390 360 330 300 270 240 210 180 150 120 90 60 30 0
MAX4533 toc01
ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
V+ = +9V 350 300 250 RON () V+ = +12V V+ = +15V V+ = +20V V+ = +25V V+ = +30V RON ()
MAX4533toc02
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
225 200 175 150 125 100 75 TA = 0C TA = -40C TA = -55C -15 -10 -5 0 VCOM (V) 5 TA = +25C TA = +125C TA = +85C TA = +70C
MAX4533 toc03
400
250
V = 4.5V
RON ()
V = 10V V = 12V
200 150 100
V = 15V V = 18V -18 -15 -12 -9 -6 -3 0 3 VCOM (V) 6 9 12 15 18
V+ = +36V 50 V- = 0 0 0 5 10 15 20 VCOM (V) 25 30 35 40
50 25 0
V+ = +15V V- = -15V 10 15
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
MAX4533 toc04
ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE
MAX4533 toc05
CHARGE INJECTION vs. VCOM
4.5 4.0 3.5 Q (pC) 3.0 2.5 2.0 1.5 DUAL SUPPLIES
MAX4533 toco6
450 400 350 300 RON () 250 200 150 100 50 0 0 2 4 6 VCOM (V) 8 10 TA = -40C TA = -55C V+ = +12V V- = 0 TA = +70C TA = +25C TA = 0C TA = +125C TA = +85C
1000 100 LEAKAGE CURRENT (A) 10 1 0.1 0.01 0.001 0.0001 INC_OFF (V+ = +12V, V- = 0) ICOM_ON (V+ = +15V, V- = -15V) ICOM_ON (V+ = +12V, V- = 0) INC_OFF (V+ = +15V, V- = -15V)
5.0
1.0 0.5 0 -15 -10
SINGLE SUPPLY
12
-55 -35 -15
5 25 45 65 85 105 125 TEMPERATURE (C)
-5
0 VCOM (V)
5
10
15
TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE (DUAL SUPPLIES)
MAX4533 toc07a
TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE (SINGLE SUPPLY)
MAX4533 toc07b
TURN-ON/TURN-OFF TIME vs. TEMPERATURE (DUAL SUPPLIES)
180 160 140 tON, tOFF (ns) tON tOFF
MAX4533 toc08a
600 500 400 300 200 100 0 4 6 8 10 12 14 SUPPLY VOLTAGE (V) 16 tOFF tON
250
200
200 tON, tOFF (ns) tON tOFF
tON, tOFF (ns)
150
120 100 80 60
100
50
40 20 V+ = +15V V- = -15V -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C)
0 18 8 12 16 20 24 28 SUPPLY VOLTAGE (V) 32 36
0
6
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Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.) TURN-ON/TURN-OFF TIME vs. TEMPERATURE (SINGLE SUPPLY)
MAX4533 toc08b
MAX4533
POWER-SUPPLY CURRENT vs. TEMPERATURE (DUAL SUPPLIES, VIN = 0)
MAX4533 toc09a
400 300 SUPPLY CURRENT (A) 200 100 0 -100 -200 -300 IV+ = +15V V- = -15V -55 -35 -15 IGND I+
200 tON tON, tOFF (ns) 150 tOFF 100
600 I+ SUPPLY CURRENT (A) 400 200 0 -200 -400 -600 -55 -35 -15 IV+ = +15V V- = -15V IGND
50 V+ = +12V V- = 0 0 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C)
-400 -500
5 25 45 65 85 105 125 TEMPERATURE (C)
5 25 45 65 85 105 125 TEMPERATURE (C)
POWER-SUPPLY CURRENT vs. TEMPERATURE (SINGLE SUPPLY)
350 SUPPLY CURRENT (A) 300 250 200 150 100 50 0 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C) 0 4 8 IGND I+ V+ = +12V V- = 0 VIN = +5V
MAX4533 toc09c
LOGIC-LEVEL THRESHOLD vs. SUPPLY VOLTAGE
MAX4533 toc10
OVERVOLTAGE WITH 25V INPUT
MAX4533 toc11
400
3.0 2.5 2.0 1.5 1.0 0.5 DUAL-SUPPLY RANGE SINGLE-SUPPLY RANGE
LOGIC-LEVEL THRESHOLD (V)
NO_ or NC_ (10V/div) OV
COM_ (10V/div) OV
12
16 20 24 28 SUPPLY VOLTAGE (V)
32
36
5s/div
FAULT-FREE SIGNAL WITH 15V INPUT
NO_ or NC_ (10V/div) OV
MAX4533 toc12
FAULT RECOVERY TIME
NO_ or NC_ (10V/div) OV
MAX4533 toc13
COM_ (10V/div) OV
COM_ (10V/div) OV
5s/div
2s/div
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7
MAX4533 toc09b
250
500
POWER-SUPPLY CURRENT vs. TEMPERATURE (DUAL SUPPLIES, VIN = +5V)
800
Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, TA = +25C, unless otherwise noted.) FREQUENCY RESPONSE (DUAL SUPPLIES)
MAX4533 toc14a
FREQUENCY RESPONSE (SINGLE SUPPLY)
-10 -20 RESPONSE (dB) -30 -40 -50 -60 -70 -80 OFF ISOLATION CROSSTALK BANDWIDTH
MAX4533 toc14b
0 -10 -20 RESPONSE (dB) -30 -40 -50 -60 -70 -80 -90 -100 0.01 0.1 1 10 FREQUENCY (MHz) V+ = +15V V- = -15V 100 OFF ISOLATION CROSSTALK BANDWIDTH
0
-90 -100 0.01 0.1 1 10 FREQUENCY (MHz)
V+ = +12V V- = 0 100 1000
1000
Pin Description
PIN 1, 10, 11, 20 2, 9, 12, 19 3, 8, 13, 18 4, 7, 14, 17 5 6 15 16 NAME IN1, IN2, IN3, IN4 NO1, NO2, NO3, NO4 COM1, COM2, COM3, COM4 NC1, NC2, NC3, NC4 VGND N.C. V+ Logic Control Digital Inputs Normally Open Inputs* Analog Switch Common Outputs* Normally Closed Inputs* Negative Analog Supply Voltage Input Digital Ground No Connection. Not internally connected. Positive Analog and Digital Supply-Voltage Input FUNCTION
*When the voltage on NO_ or NC_ does not exceed V+ or V-, NO_ (or NC_) and COM_ pins are bidirectional.
Detailed Description
The MAX4533 is a fault-protected analog switch with special operation and construction. Traditional fault-protected switches are constructed using three-series CMOS devices. This combination produces good fault protection but fairly high on-resistance when the signals are within about 3V of each supply rail. These series devices are not capable of handling signals up to the power-supply rails. The MAX4533 differs considerably from traditional faultprotected switches, with three advantages. First, it is constructed with two parallel FETs, allowing very low on-resistance when the switch is on. Second, they allow signals on the NC_ or NO_ pins that are within or slightly
8
beyond the supply rails to be passed through the switch to the COM_ terminal, allowing rail-to-rail signal operation. Third, when a signal on NC_ or NO_ exceeds the supply rails by about 150mV (a fault condition), the voltage on COM_ is limited to the appropriate polarity supply voltage. Operation is identical for both fault polarities. The fault-protection extends to 25V with power on and 40V with power off. The MAX4533 has a parallel N-channel and P-channel MOSFET switch configuration with input voltage sensors. The simplified internal structure is shown in Figure 1. The parallel N1 and P1 MOSFETs form the switch element. N3 and P3 are sensor elements to sample the input voltage and compare it against the power-supply rails.
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Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch
Fault Condition
-15V COMPARATOR
MAX4533
-15V
N3 SENSE SWITCH
N-CHANNEL DRIVER
-V(-15V)
The MAX4533 protects devices connected to its output (COM_) through its unique fault-protection circuitry. When the input voltage is raised above either supply rail, the internal sense and comparator circuitries (N3 and N-channel driver or P3 and P-channel driver) disconnect the output (COM_) from the input (Figure 1). If the switch driven above the supply rail has an on state, the clamp circuitries (N2 or P2) connect the output to the appropriate supply rail. Table 1 summarizes the MAX4533's operation under normal and fault conditions. Row 5 shows a negative fault condition when the supplies are on. It shows that with supplies of 15V, if the input voltage is between -15V and -25V, the output (COM_) clamps to the negative supply rail of -15V. With this technique, the SPDT switch is capable of withstanding a worse-case condition of opposite fault polarities at its inputs.
CLAMP N2 N1 OUTPUT COM_ CLAMP P2
NC_ or INPUT NO_ P3 SENSE SWITCH
P1
+V(+15V) +15V P-CHANNEL DRIVER
Transient Fault Condition
+15V COMPARATOR
Figure 1. Simplified Internal Structure
During normal operation of a conducting channel, N1 and P1 remain on with a typical 125 on-resistance between NO_ (or NC_) and COM_. If the input voltage exceeds either supply rail by about 150mV, the parallel combination switches (N1, P1) are forced off through the driver and sensing circuitries. At the same time, the output (COM_ ) is clamped to the appropriate supply rail by the clamp circuitries (N2, P2). Two clamp circuits limit the output voltage to the supply voltages. For simplicity, Figure 1 shows only one side of the SPDT switch configuration. The complete circuit is composed of two channels with their outputs connected.
When a fast rising or falling transient on NO_ (or NC_) exceeds V+ or V-, the output (COM_) follows the input (IN_) to the supply rail by only a few nanoseconds. This delay is due to the switch on-resistance and circuit capacitance to ground. However, when the input transient returns to within the supply rails there is a longer 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 are not dependent on the fault amplitude. Higher COM_ output resistance and capacitance increase the recovery times.
Fault Protection, Voltage, and Power Off
The maximum fault voltage on the NO_ or NC_ pins is 40V from ground when the power is off. With 15V supply voltages, the highest voltage on NO_ (or NC_) can be +25V, and the lowest voltage on NO_ (or NC_) can be -25V. Exceeding these limits can damage the chip.
Normal Operation
Two comparators continuously compare the voltage on the NO_ (or NC_ ) pin with V+ and V- supply voltages. When the signal on NO_ (or NC_ ) is between V+ and V-, the switch behaves normally, with FETs N1 and P1 turning on and off in response to NO_ (or NC_) signals (Figure 1). For any voltage between the supply rails, the switch is bidirectional; therefore, COM_ and NC_ (or NO_ ) are interchangeable. Only NO_ and NC_ can be exposed to overvoltages beyond the supply range and within the specified breakdown limits of the device.
IN_ Logic-Level Thresholds
The logic-level thresholds are TTL/CMOS-compatible when V+ is +15V. Raising V+ increases the threshold slightly; when V+ reaches +25V, the level threshold is 2.8V--higher than the TTL output high-level minimum of 2.4V, but still compatible with CMOS outputs (see the Typical Operating Characteristics). Increasing V- has no effect on the logic-level thresholds, but it does increase the gate-drive voltage to the signal FETs, reducing their on-resistance.
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9
Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533
Table 1. Switch States in Normal and Fault Conditions
POWER SUPPLIES (V+, V-) On On On On On On Off INPUT RANGE Between Rails Between Rails Between V+ and (+40V - V+) Between V+ and (+40V - V+) Between V- and (-40V - V-) Between V- and (-40V - V-) Between Rails NC_ On Off On Off On Off Off NO_ Off On Off On Off On Off OUTPUT NC_ NO_ V+ V+ VVFollows the load terminal voltage.
Failure Modes
The MAX4533 is not a lightning arrester or surge protector. Exceeding the fault-protection voltage limits on NO_ or NC_, even for very short periods, can cause the device to fail.
drive signal is the only connection between the power supplies and the analog signals. GND, IN_, 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 +12V or -15V to +15V, the supply current reduces to approximately half of the supply current when the logic input levels are at 0 to 5V.
Applications Information
Ground
There is no connection between the analog signal paths and GND. The analog signal paths consist of an N-channel and 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 switches. This
Power Supplies
The MAX4533 operates with bipolar supplies between 4.5V and 18V. The V+ and V- supplies need not be symmetrical, but their difference can not exceed the absolute maximum rating of +44V. The MAX4533 operates from a single supply between +9V and +36V when V- is connected to GND.
Test Circuits/Timing Diagrams
t R < 20ns t F < 20ns 50% 0V t ON t OFF +10V V COM 0V -10V t OFF t ON t OPEN (REPEAT TEST FOR IN2, IN3, AND IN4.) 50% 50% +15V -15V t OPEN 50% 50% LOGIC INPUT V+ GND V-10V IN_ 50%
3V V IN
MAX4533
+10V
NC_ COM_ NO_
SWITCH OUTPUT
2k
Figure 2. Switching-Time Test Circuit
10 ______________________________________________________________________________________
Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch
Test Circuits/Timing Diagrams (continued)
+15V LOGIC INPUT +3V 50% 0V VCOM VO1 0.9VO LOGIC INPUT V+ NO V COM COM_ NC IN_ GND VVO2 RL2 RL1 VO1 CL1
MAX4533
MAX4533
0V SWITCH OUTPUT VCOM VO2 SWITCH OUTPUT 0V tD tD 0.9VO
CL2
-15V CL INCLUDES FIXTURE AND STRAY CAPACITANCE. LOGIC 0 INPUT.
R L = 1000 C L = 35pF
Figure 3. Break-Before-Make
V+ VIN_ V+ IN_ VCOM_ VIN_ 0V V+
50
MAX4533
NC_ OR NO_ GND VCL 100pF
VOUT
VOUT
VOUT
V-
VOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = VOUT x CL
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 4. Charge Injection
V+ V+ V+ NO_
MAX4533
ADDRESS SELECT IN_ GND
NC_ COM_ V1MHz CAPACITANCE ANALYZER
VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 5. COM_, NO_, NC_ Capacitance
______________________________________________________________________________________ 11
Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533
Test Circuits/Timing Diagrams (continued)
V+ 10nF NETWORK ANALYZER V+ COM_ VIN 50 50 OFF ISOLATION = 20 log ON LOSS = 20 log VOUT NO_, NC_ GND VMEAS. 50 50 REF. CROSSTALK = 20 log VOUT VIN VOUT VIN VOUT VIN
MAX4533
ADDRESS SELECT IN_
10nF VMEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT SOCKET TERMINALS. OFF ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINALS. ON LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINALS. CROSSTALK IS MEASURED BETWEEN COM_ TERMINALS WITH ALL SWITCHES ON. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 6. Frequency Response, Off-Isolation, and Crosstalk
Ordering Information (continued)
PART MAX4533CPP MAX4533EAP MAX4533ESP MAX4533EPP MAX4533MJP TEMP. RANGE 0C to +70C -40C to +85C -40C to +85C -40C to +85C -55C to +125C PIN-PACKAGE 20 Plastic DIP 20 SSOP 20 Wide SO 20 Plastic DIP 20 CERDIP
Chip Information
TRANSISTOR COUNT: 448
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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