19-1452; Rev 1; 10/99
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
Features
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® 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.
♦ Rail-to-Rail Signal Handling
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 175Ω max
and is matched between switches to 10Ω max. The offleakage current is only 0.5nA at TA = +25°C and 10nA at
TA = +85°C.
♦ 20ns (typ) Fault Response Time
Applications
Redundant/Backup Systems
Portable Instruments
Test Equipment
Communications Systems
Data-Acquisition
Systems
Industrial and Process Control
Avionics Systems
♦ ±40V Fault Protection with Power Off
±25V Fault Protection with ±15V Supplies
♦ All Switches Off with Power Off
♦ No Power-Supply Sequencing Required During
Power-Up or Power-Down
♦ Output Clamped to Appropriate Supply Voltage
During Fault Condition—No Transition Glitch
♦ 1kΩ (typ) Output Clamp Resistance During
Overvoltage
♦ 175Ω (max) Signal Paths with ±15V Supplies
♦ ±4.5V to ±18V Dual Supplies
+9V to +36V Single Supply
♦ Pin-Compatible with Industry-Standard
MAX333/MAX333A
♦ TTL/CMOS-Compatible Logic Inputs with ±15V or
Single +9V to +15V Supplies
Ordering Information
PART
TEMP. RANGE
MAX4533CAP
PIN-PACKAGE
0°C to +70°C
20 SSOP
MAX4533CWP
0°C to +70°C
20 Wide SO
Ordering Information continued at end of data sheet.
Pin Configuration/
Functional Diagram
Typical Operating Circuit
OUTPUTS
INPUTS
V1
V1 - V2
V2
TOP VIEW
IN1 1
20 IN4
NO1 2
19 NO4
COM1 3
OSC
IN
18 COM4
NC1 4
MAX4533
GND 6
V3 - V4
V3
NC2 7
COM2 8
V4
FLYING CAPACITOR LEVEL TRANSLATOR
(2-CHANNEL)
17 NC4
V- 5
16 V+
MAX4533
15 N.C.
14 NC3
13 COM3
NO2 9
12 NO3
IN2 10
11 IN3
SSOP/SO/DIP/CERDIP
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
† Pg
SWITCHES ARE SHOWN WITH LOGIC "0" INPUT
N.C. = NOT INTERNALLY CONNECTED
________________________________________________________________ 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
MAX4533†
General Description
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 = +70°C)
20-Pin SSOP (derate 10.53mW/°C above +70°C) ........842mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C) .. 800mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) 889mW
20-Pin CERDIP (derate 11.11mW/°C above +70°C).....889mW
Operating Temperature Ranges
MAX4533C_ _ ......................................................0°C to +70°C
MAX4533E_ _ ...................................................-40°C to +85°C
MAX4533M_ _.................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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 = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
Fault-Free Analog Signal Range
(Note 2)
VNO_, VNC_
V+ = +15V, V- = -15V,
VNO_ or VNC_ = ±15V
COM_ to NO_ or COM_ to NC_
On-Resistance
RON
VNO_ or VNC_ = ±10V,
ICOM_ = 1mA
COM_ to NO_ or COM_ to NC_
On-Resistance Match Between
Channels (Note 4)
∆RON
VNO_ or VNC_ = ±10V,
ICOM_ = 1mA
TA
MIN
C, E, M
V-
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
VCOM_ = +5V, 0, -5V,
ICOM_ = 1mA
On-Resistance Flatness
NO_ or NC_ Off-Leakage
Current (Note 5)
INO_(OFF),
INC_(OFF)
COM_ On-Leakage Current
(Note 5)
ICOM_(ON)
+25°C
C, E
M
+25°C
125
175
Ω
1
200
250
6
10
15
Ω
C, E
M
+25°C
C, E
M
+25°C
VCOM_ = ±14V,
C, E
VNO_ or VNC_= ±14V or floating
M
-0.5
-10
-200
-0.5
-20
-400
Applies with power on
Applies with power off
-25
-40
-10
-200
-10
-20
-200
-10
VNO_ or VNC_ = ±14V,
VCOM_ = 14V
Ω
4
+25°C
±
0.02
0.01
0.5
10
200
0.5
20
400
nA
nA
FAULT
Fault-Protected Analog Signal
Range (Note 2)
VNO_, VNC_
COM_ Output Leakage Current,
Supplies On
ICOM_
NO_ or NC_ Off Input Leakage
Current, Supplies On
INO_, INC_
2
VNO_ or VNC_ = ±25V,
no connection to “ON” channel
VNO_ or VNC_ = ±25V,
VCOM_ = 10V
±
MAX4533
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
+25°C
+25°C
+25°C
C, E
M
+25°C
C, E
M
_______________________________________________________________________________________
+25
+40
10
200
10
20
200
10
V
nA
µA
nA
µA
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
MAX4533
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
NO_ or NC_ Input Leakage
Current, Supplies Off
SYMBOL
CONDITIONS
INO_, INC_
VNO_ or VNC_ = ±40V,
V+ = 0, V- = 0
COM_ On-Clamp Output
Current, Supplies On
ICOM_
VNO_ or VNC_ = +25V
VNO_ or VNC_ = -25V
COM_ On-Clamp Output
Resistance, Supplies On
RCOM_
VNO_ or VNC = ±25V
TA
MIN
TYP
MAX
+25°C
C, E
M
+25°C
+25°C
+25°C
C, E, M
-20
-200
-10
8
-12
0.1
20
200
10
13
-7
2.5
3
11
-10
1.0
UNITS
nA
µA
mA
kΩ
±Fault Output Clamp Turn-On
Delay Time (Note 6)
RL = 10kΩ,
VNO_ or VNC_ = ±25V
+25°C
20
ns
±Fault Recovery Time
(Note 6)
RL = 10kΩ,
VNO_ or VNC_ = ±25V
+25°C
2.5
µs
LOGIC INPUT
IN_ Input Logic Threshold High
VIN_H
C, E, M
IN_ Input Logic Threshold Low
VIN_L
C, E, M
IN_ Input Current Logic High or
Low
IIN_H, IIN_L
VIN_ = +0.8V or +2.4V
2.4
V
0.8
+25°C
-1
C, E, M
-5
0.03
1
5
V
µA
SWITCH DYNAMIC CHARACTERISTICS
+25°C
C, E
M
+25°C
C, E
M
Turn-On Time
tON
VCOM_ = ±10V,
RL = 2kΩ; Figure 2
Turn-Off Time
tOFF
VNO_ = ±10V,
RL = 2kΩ; Figure 2
Break-Before-Make Time Delay
tBBM
VCOM_ = ±10V,
RL = 1kΩ; Figure 3
+25°C
CL = 100pF,
VCOM_ = 0; Figure 4
+25°C
CN_(OFF)
f = 1MHz; Figure 5
CCOM_(ON)
f = 1MHz; Figure 5
Charge Injection (Note 6)
NO_ or NC_ Off-Capacitance
COM_ On-Capacitance
Q
100
60
10
250
400
600
150
300
450
ns
ns
50
ns
1.5
pC
+25°C
5
pF
+25°C
12
pF
Off-Isolation (Note 7)
VISO
RL = 50Ω, CL = 15pF,
VN_ = 1VRMS, f = 1MHz;
Figure 6
+25°C
-62
dB
Channel-to-Channel Crosstalk
(Note 8)
VCT
RL = 50Ω, CL = 15pF,
VN_ = 1VRMS, f = 1MHz;
Figure 6
+25°C
-66
dB
POWER SUPPLY
Power-Supply Range
V+, V-
±4.5
±18
V+ Supply Current
I+
All VIN_ = 0 or +5V,
VNO_ = VNC_ = 0
+25°C
600
C, E, M
1000
V- Supply Current
I-
All VIN_ = 0 or +5V,
VNO_ = VNC_ = 0
+25°C
400
C, E, M
600
IGND
All VIN_ = 0 or +5V,
VNO_ = VNC_ = 0
+25°C
300
C, E, M
450
GND Supply Current
V
µA
µA
µA
_______________________________________________________________________________________
3
MAX4533
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
ELECTRICAL CHARACTERISTICS—Single Supply
(V+ = +12V, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
C, E, M
0
TYP
MAX
UNITS
V+
V
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)
VNO_, VNC_
V+ = +12V, V- = 0,
VNO_ or VNC_ = +12V or 0
RON
V+ = +12V,
VNO_ or VNC_ = +10V,
ICOM_ = 1mA
∆RON
V+ = +12V,
VNO_ or VNC_ = +10V,
ICOM_ = 1mA
NO_ or NC_ Off-Leakage
Current (Notes 5, 9)
INO_(OFF),
INC_(OFF)
COM_ On-Leakage Current
(Notes 5, 9)
ICOM_(ON)
+25°C
C, E
M
+25°C
C, E
M
+25°C
V+ = +12V,
C, E
VCOM_ = +10V, +1V,
VNO_ or VNC_ = +1V, +10V
M
+25°C
V+ = +12V,
C, E
VCOM_ = +10V,
VNO_ or VNC_= +10V or floating
M
-0.5
-10
-200
-0.5
-20
-400
260
390
Ω
4
450
525
10
20
30
0.5
10
200
0.5
20
400
Ω
0.01
0.01
nA
nA
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)
VNO_, VNC_
ICOM_
INO_, INC_
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
+25°C
+25°C
+25°C
C, E
M
+25°C
C, E
M
+25°C
C, E
M
-25
-40
-10
-200
-10
-20
-200
-10
-20
-200
-10
2
INO_, INC_
VNO_ or VNC_ = ±40V,
V+ = 0, V- = 0
COM_ On-Clamp Output
Current, Supply On
ICOM_
VNO_ or VNC_ = ±25V,
V+ = +12V
+25°C
COM_ On-Clamp Output
Resistance, Supply On
RCOM_
VNO_ or VNC_ = ±25V,
V+ = +12V
+25°C
LOGIC INPUT
IN_ Input Logic Threshold High
IN_ Input Logic Threshold Low
IN_ Input Current Logic High or
Low
4
VIN_H
VIN_L
IIN_H, IIN_L
VIN_ = +0.8V or +2.4V
C, E, M
C, E, M
+25°C
C, E, M
0.1
+25
+40
10
200
10
20
200
10
20
200
10
nA
µA
nA
µA
nA
µA
3
5
mA
2.4
5
kΩ
0.03
0.8
1
5
2.4
-1
-5
V
_______________________________________________________________________________________
V
V
µA
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
MAX4533
ELECTRICAL CHARACTERISTICS—Single Supply (continued)
(V+ = +12V, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
MAX
UNITS
SWITCH DYNAMIC CHARACTERISTICS
+25°C
Turn-On Time
tON
VCOM_ = +10V,
RL = 2kΩ; Figure 2
Turn-Off Time
tOFF
VCOM_ = +10V,
RL = 2kΩ; Figure 2
Break-Before-Make Time Delay
tBBM
VCOM_ = +10V,
RL = 1kΩ; Figure 3
+25°C
CL = 100pF,
VCOM_ = 0; Figure 4
+25°C
CN_(OFF)
f = 1MHz; Figure 5
CCOM_(ON)
f = 1MHz; Figure 5
Charge Injection
Q
NO_ or NC_ Off-Capacitance
COM_ On-Capacitance
200
C, E, M
500
1000
+25°C
100
C, E, M
300
900
5
ns
ns
100
ns
2
pC
+25°C
5
pF
+25°C
15
pF
Off-Isolation (Note 7)
VISO
RL = 50Ω, CL = 15pF,
VNO_ = 1VRMS, f = 1MHz;
Figure 6
+25°C
-62
dB
Channel-to-Channel Crosstalk
(Note 8)
VCT
RL = 50Ω, CL = 15pF,
VNO_ = 1VRMS, f = 1MHz;
Figure 6
+25°C
-65
dB
POWER SUPPLY
Power-Supply Range
V+ Supply Current
I+
V- and GND Supply Current
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
V+
IGND
C, E, M
All VIN_ = 0 or +5V,
VNO_ = VNC_ = 0
9
36
+25°C
350
C, E, M
550
All VIN_ = 0 or +12V,
VNO_ = VNC_ = 0
+25°C
200
C, E, M
350
All VIN_ = 0 or +5V,
VNO_ = VNC_ = 0
+25°C
350
C, E, M
550
V
µA
µA
µA
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 = +25°C.
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.
_______________________________________________________________________________________
5
Typical Operating Characteristics
(V+ = +15V, V- = -15V, TA = +25°C, unless otherwise noted.)
V+ = +20V
V+ = +25V
V+ = +30V
200
150
75
50
0
9 12 15 18
5
10
TA = +25°C
TA = 0°C
150
TA = -40°C
TA = -55°C
100
35
40
-15
6
8
10
1
0.01
1.5
5 25 45 65 85 105 125
TEMPERATURE (°C)
-15
200
-10
tON, tOFF (ns)
tOFF
tON
150
tOFF
100
-5
0
VCOM (V)
10
15
200
180
160
tON
120
100
tOFF
80
60
40
50
100
V+ = +15V
V- = -15V
20
0
0
0
±4
6
5
TURN-ON/TURN-OFF TIME vs.
TEMPERATURE (DUAL SUPPLIES)
MAX4533 toc07b
250
MAX4533 toc07a
MAX4533 toco6
0
-55 -35 -15
140
300
200
SINGLE SUPPLY
0.5
TURN-ON/TURN-OFF TIME vs.
SUPPLY VOLTAGE (SINGLE SUPPLY)
tON
400
DUAL SUPPLIES
1.0
INC_OFF (V+ = +12V, V- = 0)
TURN-ON/TURN-OFF TIME vs.
SUPPLY VOLTAGE (DUAL SUPPLIES)
500
15
2.5
2.0
VCOM (V)
600
3.0
0.1
12
10
3.5
INC_OFF (V+ = +15V, V- = -15V)
tON, tOFF (ns)
4
5
4.0
ICOM_ON (V+ = +12V, V- = 0)
10
0
VCOM (V)
4.5
0.0001
0
2
-5
CHARGE INJECTION vs. VCOM
ICOM_ON (V+ = +15V, V- = -15V)
100
0.001
V+ = +12V
V- = 0
50
0
-10
5.0
Q (pC)
TA = +70°C
200
30
1000
LEAKAGE CURRENT (A)
350
250
25
MAX4533 toc05
TA = +85°C
300
20
ON/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4533 toc04
TA = +125°C
400
15
VCOM (V)
450
V+ = +15V
V- = -15V
0
0
ON-RESISTANCE vs. VCOM AND
TEMPERATURE (SINGLE SUPPLY)
RON (Ω)
25
V- = 0
6
TA = 0°C
TA = -40°C
TA = -55°C
50
V+ = +36V
-18 -15 -12 -9 -6 -3 0 3
VCOM (V)
TA = +25°C
125
100
100
V± = ±15V
V± = ±18V
150
MAX4533 toc08a
180
150
120
90
60
30
0
175
RON (Ω)
V± = ±10V
V± = ±12V
TA = +85°C
TA = +70°C
200
V+ = +15V
250
TA = +125°C
225
V+ = +12V
MAX4533 toc03
V+ = +9V
350
300
250
MAX4533toc02
V± = ±4.5V
ON-RESISTANCE vs. VCOM AND
TEMPERATURE (DUAL SUPPLIES)
400
MAX4533 toc01
390
360
330
300
270
240
210
ON-RESISTANCE vs. VCOM
(SINGLE SUPPLY)
RON (Ω)
RON (Ω)
ON-RESISTANCE vs. VCOM
(DUAL SUPPLIES)
tON, tOFF (ns)
MAX4533
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
±6
±8 ±10 ±12 ±14
SUPPLY VOLTAGE (V)
±16
±18
8
12
16
20
24
28
SUPPLY VOLTAGE (V)
32
36
-55 -35 -15
5 25 45 65 85 105 125
TEMPERATURE (°C)
_______________________________________________________________________________________
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
POWER-SUPPLY CURRENT vs.
TEMPERATURE (DUAL SUPPLIES, VIN = 0)
300
150
tOFF
100
I+
200
100
IGND
0
-100
-200
I+
I-
400
IGND
200
0
-200
I-
-300
V+ = +12V
V- = 0
-400
V+ = +15V
V- = -15V
-400
-500
0
-55 -35 -15
-55 -35 -15
5 25 45 65 85 105 125
TEMPERATURE (°C)
300
250
I+
200
150
IGND
100
MAX4533 toc10
2.5
DUAL-SUPPLY
RANGE
2.0
SINGLE-SUPPLY
RANGE
1.5
5 25 45 65 85 105 125
TEMPERATURE (°C)
OVERVOLTAGE WITH ±25V INPUT
3.0
LOGIC-LEVEL THRESHOLD (V)
MAX4533 toc09c
V+ = +12V
V- = 0
VIN = +5V
350
-600
-55 -35 -15
LOGIC-LEVEL THRESHOLD
vs. SUPPLY VOLTAGE
POWER-SUPPLY CURRENT vs.
TEMPERATURE (SINGLE SUPPLY)
400
5 25 45 65 85 105 125
TEMPERATURE (°C)
V+ = +15V
V- = -15V
MAX4533 toc11
50
NO_ or
NC_
(10V/div)
OV
COM_
(10V/div)
OV
1.0
0.5
50
0
-55 -35 -15
5 25 45 65 85 105 125
TEMPERATURE (°C)
4
8
12
16 20 24 28
SUPPLY VOLTAGE (V)
FAULT-FREE SIGNAL WITH ±15V INPUT
NO_ or
NC_
(10V/div)
OV
32
5µs/div
36
FAULT RECOVERY TIME
MAX4533 toc13
0
MAX4533 toc12
SUPPLY CURRENT (µA)
600
SUPPLY CURRENT (µA)
tON
800
MAX4533 toc09a
400
SUPPLY CURRENT (µA)
200
tON, tOFF (ns)
500
MAX4533 toc08b
250
POWER-SUPPLY CURRENT vs.
TEMPERATURE (DUAL SUPPLIES, VIN = +5V)
MAX4533 toc09b
TURN-ON/TURN-OFF TIME vs.
TEMPERATURE (SINGLE SUPPLY)
NO_ or
NC_
(10V/div)
OV
COM_
(10V/div)
COM_
(10V/div)
OV
OV
5µs/div
2µs/div
_______________________________________________________________________________________
7
MAX4533
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, TA = +25°C, unless otherwise noted.)
FREQUENCY RESPONSE
(DUAL SUPPLIES)
FREQUENCY RESPONSE
(SINGLE SUPPLY)
BANDWIDTH
0
-20
-20
-30
RESPONSE (dB)
-40
-50
OFF ISOLATION
-40
-50
OFF ISOLATION
-60
CROSSTALK
-70
BANDWIDTH
-10
-30
-60
MAX4533 toc14b
-10
MAX4533 toc14a
0
RESPONSE (dB)
MAX4533
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
CROSSTALK
-70
-80
-80
-90
V+ = +15V
V- = -15V
-100
0.01
0.1
1
10
100
-90
V+ = +12V
V- = 0
-100
1000
0.01
0.1
FREQUENCY (MHz)
1
10
100
1000
FREQUENCY (MHz)
Pin Description
PIN
NAME
1, 10, 11, 20
IN1, IN2, IN3, IN4
2, 9, 12, 19
NO1, NO2, NO3, NO4
3, 8, 13, 18
COM1, COM2, COM3, COM4
4, 7, 14, 17
NC1, NC2, NC3, NC4
FUNCTION
Logic Control Digital Inputs
Normally Open Inputs*
Analog Switch Common Outputs*
Normally Closed Inputs*
5
V-
6
GND
Negative Analog Supply Voltage Input
Digital Ground
15
N.C.
No Connection. Not internally connected.
16
V+
Positive Analog and Digital Supply-Voltage Input
*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.
_______________________________________________________________________________________
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
-15V
COMPARATOR
N3
N-CHANNEL
DRIVER
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).
-V(-15V)
SENSE
SWITCH
CLAMP N2
NC_
or INPUT
NO_
N1
OUTPUT COM_
CLAMP P2
P1
P3
SENSE
SWITCH
+V(+15V)
+15V
P-CHANNEL
DRIVER
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.
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 125Ω 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.
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.
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 2.5µs. For negative faults, the recovery time is
typically 1.3µs. 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.
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.
_______________________________________________________________________________________
9
MAX4533
Fault Condition
-15V
MAX4533
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
Table 1. Switch States in Normal and Fault Conditions
POWER
SUPPLIES
(V+, V-)
INPUT
RANGE
NC_
On
Between Rails
On
Off
NC_
On
Between Rails
Off
On
NO_
On
Between V+ and (+40V - V+)
On
Off
V+
On
Between V+ and (+40V - V+)
Off
On
V+
On
Between V- and (-40V - V-)
On
Off
V-
On
Between V- and (-40V - V-)
Off
On
V-
Off
Follows the load
terminal voltage.
Off
Between Rails
NO_
Off
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.
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
OUTPUT
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.
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
3V
50%
V IN
MAX4533
50%
NC_
+10V
0V
NO_
-10V
t ON
t OFF
2kΩ
IN_
t OPEN
+10V
V COM
SWITCH OUTPUT
COM_
50%
50%
0V
50%
-10V
LOGIC
INPUT
V+
GND
V-
50%
+15V
-15V
t OFF
t ON
t OPEN
(REPEAT TEST FOR IN2, IN3, AND IN4.)
Figure 2. Switching-Time Test Circuit
10
______________________________________________________________________________________
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
+15V
LOGIC
INPUT
+3V
50%
0V
NC
VO1
0.9VO
IN_
0V
SWITCH
OUTPUT VCOM
VO2
LOGIC
INPUT
0.9VO
VO1
NO
V COM COM_
VCOM
SWITCH
OUTPUT
V+
MAX4533
RL2
GND
V-
-15V
0V
tD
CL1
RL1
VO2
CL2
R L = 1000Ω
C L = 35pF
tD
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
LOGIC 0 INPUT.
Figure 3. Break-Before-Make
V+
V+
V+
VIN_
VCOM_
IN_
50Ω
VIN_
0V
MAX4533
NC_ OR NO_
GND
VOUT
∆ VOUT
VOUT
CL
100pF
V-
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+
NO_
V+
MAX4533
ADDRESS SELECT
NC_
COM_
IN_
GND
1MHz
CAPACITANCE
ANALYZER
V-
VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 5. COM_, NO_, NC_ Capacitance
______________________________________________________________________________________
11
MAX4533
Test Circuits/Timing Diagrams (continued)
Quad, Rail-to-Rail, Fault-Protected,
SPDT Analog Switch
MAX4533
Test Circuits/Timing Diagrams (continued)
V+ 10nF
NETWORK
ANALYZER
V+
VIN
50Ω
50Ω
COM_
MAX4533
ADDRESS SELECT
VOUT
IN_
NO_, NC_
V-
GND
MEAS.
REF.
50Ω
OFF ISOLATION = 20 log
VOUT
VIN
ON LOSS = 20 log
VOUT
VIN
CROSSTALK = 20 log
VOUT
VIN
50Ω
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
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
20 Plastic DIP
20 SSOP
MAX4533EWP
MAX4533EPP
MAX4533MJP
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
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
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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