MAX4510EUA-T [MAXIM]
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| 型号： | MAX4510EUA-T |
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MAXIM INTEGRATED PRODUCTS |
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19-1542; Rev 0; 10/99
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
General Description
Features
The MAX4510/MAX4520 single-pole/single-throw (SPST),
fault-protected analog switches feature a fault-protected
ꢀ
40V Fault Protection with Power Off
36V Fault Protection with 15V Supplies
®
input and Rail-to-Rail signal-handling capability. The
ꢀ Switch is Off with Power Removed
ꢀ Rail-to-Rail Signal Handling
normally open (NO) and normally closed (NC) terminals
are protected from overvoltage faults up to 36V during
power-on and 44V with power off. During a fault condi-
tion, the switch input terminal (NO or NC) becomes an
open circuit; only nanoamperes of leakage current flow
from the fault source, and the switch output (COM) fur-
nishes up to 13mA of the appropriate polarity supply
voltage to the load. This ensures unambiguous rail-to-rail
outputs when a fault begins and ends.
ꢀ 160Ω max Signal Paths with 15V Supplies
ꢀ On-Switch Turns Off with Overvoltage
ꢀ 0.5nA Off-Leakage Current
ꢀ Output Clamped to Appropriate Supply Voltage
During Fault Condition; No Transition Glitch
On-resistance is 160Ω max. The off-leakage current is
only 0.5nA at +25°C and 10nA at +85°C. The MAX4510
is a normally closed switch, while the MAX4520 is a
normally open switch. These CMOS switches operate
with dual power supplies ranging from 4.5V to 20V
or a single supply between +9V and +36V.
ꢀ No Power-Supply Sequencing Required
ꢀ
4.5V to 20V Dual Supplies
+9V to +36V Single Supply
ꢀ Low Power Consumption: <2mW
ꢀ TTL- and CMOS-Compatible Logic Inputs with
The digital input has +0.8V and +2.4V logic thresholds,
ensuring both TTL- and CMOS-logic compatibility when
using 15V or a single +12V supply. The MAX4510/
MAX4520 are available in 6-pin SOT23 and 8-pin µMAX
packages.
Single +9V to +15V or 15V Supplies
Pin Configurations/Truth Tables
Applications
Data Acquisition
TOP VIEW
Industrial and Process-Control Systems
Avionics
6
5
4
1
2
3
NC (NO)
COM
V+
V-
ATE Equipment
MAX4510
MAX4520
Redundant/Backup Systems
GND
IN
SOT23
Ordering Information
( ) ARE FOR MAX4520.
PIN-
PACKAGE
TOP
MARK
PART
TEMP. RANGE
IN
0
MAX4510
MAX4520
OFF
MAX4510EUT-T -40°C to +85°C 6 SOT23-6
MAX4510EUA -40°C to +85°C 8 µMAX
MAX4520EUT-T -40°C to +85°C 6 SOT23-6
MAX4520EUA -40°C to +85°C 8 µMAX
AABZ
—
ON
1
OFF
ON
AADK
—
SWITCHES SHOWN FOR LOGIC "0" INPUT.
ALL SWITCHES ARE OFF WITH POWER REMOVED.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND)
Continuous Power Dissipation (T = +70°C) (Note 2)
A
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+ - 36V) to (V- + 36V)
NC, NO to COM.......................................................-36V to +36V
Continuous Current into Any Terminal.............................. 30mA
Peak Current into Any Terminal
6-Pin SOT23-6 (derate 7.1mW/°C above +70°C) .........696mW
8-Pin µMAX (derate 4.10mW/°C above +70°C)............330mW
Operating Temperature Ranges
MAX45_0EUT....................................................-40°C to +85°C
MAX45_0EUA ...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
(pulsed at 1ms, 10% duty cycle)................................... 50mA
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 -36V to +36V may damage the device. These limits
apply with power applied to V+ or V-, or 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, GND = 0, V = 2.4V, V = 0.8V, T = T
to T
, unless otherwise noted. Typical values are at T =
MAX A
IH
IL
A
MIN
(
+25°C.) (Note 3)
PARAMETER
SYMBOL
, V
CONDITIONS
T
MIN
TYP
MAX
UNITS
A
ANALOG SWITCH
Fault-Free Analog Signal Range
V
Applies with power on or off
E
V-
V+
160
225
0.5
10
V
NO NC
+25°C
125
0.01
0.01
0.01
On-Resistance
R
V
=
10V, I
= 1mA
COM
Ω
ON
COM
E
+25°C
E
-0.5
-10
-0.5
-10
-0.5
-20
NO or NC Off-Leakage Current
(Notes 4, 5)
I
V
COM
V
=
14V;
NO(OFF),
nA
nA
nA
–
I
V = +14V
NO, COM
NC(OFF)
+25°C
E
0.5
10
COM Off-Leakage Current
(Notes 4, 5)
V
V
= 14V;
COM
I
COM(OFF)
–
= +14V
V
NO, NC
+25°C
E
0.5
20
COM On-Leakage Current
(Notes 4, 5)
V
COM
=
14V; V , V
=
NO NC
I
COM(ON)
14V or unconnected
FAULT (V+ = +15V, V- = -15V, unless otherwise noted.)
Applies with power on (Note 6)
Applies with power off (Note 6)
-36
-40
-10
-200
-20
-200
-20
-200
8
36
40
Fault-Protected Analog
Signal Range
V
, V
E
V
NO NC
+25°C
10
COM Off-Leakage Current,
Supplies On
I
V
NO
or V
=
36V
nA
nA
nA
mA
COM(OFF)
NC
E
+25°C
E
200
20
NO or NC Input Leakage
Current, Supplies On
V
V
or V
=
36V,
NO
NC
I
I
, I
NO NC
–
= +10V
COM
200
20
+25°C
E
0.1
NO or NC Input Leakage
Current, Supplies Off
V
NO
or V
=
40V,
NC
, I
NO NC
V+ = 0, V- = 0
200
13
V
V
or V
or V
= 36V
11
NO
NC
Clamp Output Current,
Supplies On
I
+25°C
COM
= -36V
-12
-10
-7
NO
NC
2
_______________________________________________________________________________________
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
V+ = +15V, V- = -15V, V = 2.4V, V = 0.8V, GND = 0, T = T
+25°C.) (Note 3)
to T
, unless otherwise noted. Typical values are at T =
MAX A
IH
IL
A
MIN
(
PARAMETER
SYMBOL
CONDITIONS
or V 36V
T
MIN
TYP
MAX
2.5
UNITS
kΩ
A
+25°C
E
1
Clamp Output Resistance,
Supplies On
R
COM
V
NO
=
NC
3
Fault Trip Threshold
+25°C
V- - 0.4
V+ + 0.4
V
Fault Output Turn-On
Delay Time
V
V
=
25V, R = 10kΩ
+25°C
+25°C
10
ns
L
IN
Fault Recovery Time
LOGIC INPUT
=
25V, R = 10kΩ
2.5
µs
L
IN
IN Input Logic High
IN Input Logic Low
V
E
E
2.4
V
V
INH
V
0.8
1
INL
+25°C
E
-1
-5
0.03
IN Input Current
I
, I
V
V
= 0.8V or 2.4V
µA
INH INL
IN
5
SWITCH DYNAMIC CHARACTERISTICS
+25°C
350
60
500
600
175
250
or V
= 10V, R = 2kΩ,
L
NO
NC
Turn-On Time
t
ns
ns
ON
C = 35pF, Figure 2
L
E
+25°C
E
V
NO
or V = 10V, R = 2kΩ,
NC L
Turn-Off Time
t
OFF
C = 35pF, Figure 2
L
C = 1nF, V
R = 0Ω, Figure 3
S
= 0,
L
NO
Charge Injection (Note 7)
Q
+25°C
1.5
5
pC
NO or NC Off-Capacitance
COM Off-Capacitance
COM On-Capacitance
C
f = 1MHz, Figure 4
f = 1MHz, Figure 4
f = 1MHz, Figure 4
+25°C
+25°C
+25°C
10
5
pF
pF
pF
N(OFF)
C
COM(OFF)
C
10
COM(ON)
R = 50Ω, C = 15pF,
L
L
Off-Isolation (Note 8)
VC
+25°C
-62
dB
ISO
V
= 1V
, f = 1MHz, Figure 5
N_
RMS
POWER SUPPLY
Power-Supply Range
V+, V-
I+
E
+25°C
E
4.5
-1
20
175
250
100
175
1
V
100
50
V+ Supply Current
V- Supply Current
V
V
= 0 or 5V
= 0 or 5V
= 0 or 15V
= 5V
µA
IN
+25°C
E
I-
µA
µA
IN
+25°C
E
0.01
50
V
IN
V
IN
10
GND Supply Current
I
GND
+25°C
E
100
175
_______________________________________________________________________________________
3
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
ELECTRICAL CHARACTERISTICS—Single +12V Supply
(V+ = +12V, V- = 0, GND = 0, V = 2.4V, V = 0.8V, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
IH
IL
A
MIN
(Note 3)
PARAMETER
ANALOG SWITCH
SYMBOL
CONDITIONS
T
A
MIN
TYP MAX
UNITS
Fault-Free Analog Signal Range
V , V
NO NC
Applies with power on or off
E
0
V+
V
+25°C
260
0.01
0.01
0.01
390
500
0.5
10
V
I
= 10V,
= 1mA
COM
COM
On-Resistance
R
Ω
ON
E
+25°C
E
-0.5
-10
-0.5
-10
-0.5
-20
NO or NC Off-Leakage Current
(Notes 4, 5, 9)
I
I
V
V
= 10V, 1V;
, V = 1V, 10V
NO(OFF),
NC(OFF)
COM
NO NC
nA
nA
nA
+25°C
E
0.5
10
COM Off-Leakage Current
(Notes 4, 5, 9)
V = 1V, 10V;
COM
I
COM(OFF)
V
, V = 10V, 1V
NO NC
+25°C
E
0.5
20
COM On-Leakage Current
(Notes 4, 5, 9)
V
COM
= 1V, 10V; V , V
=
NO NC
I
COM(ON)
1V, 10V, or unconnected
FAULT
Applies with power on (Note 6)
Applies with power off (Note 6)
-36
-40
36
40
Fault-Protected Analog
Signal Range
V , V
NO NC
E
V
+25°C
-10
10
COM Off-Leakage Current,
Supply On
I
V
or V
=
=
36V
nA
nA
nA
mA
kΩ
COM
NO
NC
E
+25°C
E
-200
-20
200
20
NO or NC Input Leakage
Current, Supply On
V
V
or V
36V,
NO
COM
NC
I
I
, I
NO NC
= 0
-200
-20
200
20
+25°C
E
0.1
NO or NC Input Leakage
Current, Supply Off
V
NO
or V
=
40V,
NC
, I
NO NC
V+ = 0, V- = 0
-200
200
Clamp Output Current,
Supply On
I
V
or V
= 36V
+25°C
+25°C
2
3
5
5
COM
NO
NO
NC
NC
Clamp Output Resistance,
Supply On
R
V
or V
= 36V
2.4
COM
LOGIC INPUT
IN Input Logic High
IN Input Logic Low
V
E
E
2.4
V
V
INH
V
0.8
INL
+25°C
E
-1
-5
0.03
1
5
IN Input Current
I
, I
V
IN
= 0.8V or 2.4V
µA
INH INL
4
_______________________________________________________________________________________
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)
(V+ = +12V, V- = 0, GND = 0, V = 2.4V, V = 0.8V, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
IH
IL
A
MIN
(Note 3)
PARAMETER
SYMBOL
CONDITIONS
T
MIN
TYP
500
60
MAX
UNITS
A
SWITCH DYNAMIC CHARACTERISTICS
+25°C
750
1000
200
V
or V
= 7V, R = 2kΩ,
NC
L
NO
L
Turn-On Time
t
ns
ns
ON
C = 35pF, Figure 2
E
+25°C
E
V
NO
or V
= 7V, R = 2kΩ,
NC
L
Turn-Off Time
t
OFF
C = 35pF, Figure 2
L
300
C = 1nF, V
R = 0Ω, Figure 3
S
= 0,
L
NO
Charge Injection (Note 7)
Q
+25°C
1
5
pC
C
C
,
NO(OFF)
NO or NC Off-Capacitance
COM Off-Capacitance
COM On-Capacitance
f = 1MHz, Figure 4
+25°C
+25°C
+25°C
9
9
pF
pF
pF
NC(OFF)
C
V
V
= 0, f = 1MHz, Figure 4
COM(OFF)
COM
= V
= 0,
COM
NO
C
22
COM(ON)
f = 1MHz, Figure 4
R = 50Ω, C = 15pF,
L
L
Off-Isolation (Note 8)
V
ISO
+25°C
-62
dB
V
= 1V
, f = 1MHz, Figure 5
IN
RMS
POWER SUPPLY
Power-Supply Range
V+
I+
E
+25°C
E
9
36
V
50
25
50
125
175
75
V+ Supply Current
V
= 0 or 5V
= 0 or 12V
= 0 or 5V
µA
IN
+25°C
E
V
V
µA
µA
IN
125
125
175
V- and GND Supply Current
I
GND
+25°C
E
IN
Note 3: Algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 4: Leakage parameters are 100% tested at maximum-rated hot temperature and guaranteed by correlation at T = +25°C.
A
Note 5: SOT packages are 100% tested at +25°C. Limits at the maximum-rated temperature are guaranteed by design and corre-
lation limits at +25°C. Leakage tests for the SOT package are typical only.
Note 6: NC and NO pins are fault protected. Signals on NC or NO exceeding -36V to +36V may damage the device. These limits
apply with power applied to V+ or V-, or 40V with V+ = V- = 0.
Note 7: Guaranteed by design.
Note 8: Off isolation = 20log [ V
/ (V
or V ) ], V
= output, V
or V
= input to off switch.
10
COM
NC
NO
COM
NC
NO
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
_______________________________________________________________________________________
5
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
__________________________________________Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SWITCH ON-RESISTANCE vs. V
TEMPERATURE (DUAL SUPPLIES)
AND
SWITCH ON-RESISTANCE
COM
SWITCH ON-RESISTANCE
vs. V (SINGLE SUPPLY)
vs. V
(DUAL SUPPLIES)
COM
COM
200
180
160
140
120
100
80
350
300
250
200
150
100
50
1000
V+ = +5V
V- = -5V
V+ = +5V
V+ = +12V
V+ = +15V
V+ = +20V
T
= +125°C
T
= +85°C
A
A
V+ = +12V
V- = -12V
V+ = +10V
V- = -10V
10
V+ = +24V
T
= +25°C
V+ = +30V
V+ = +36V
A
T
= -55°C
A
T
A
= -40°C
60
40
V+ = +15V
V- = -15V
V+ = +20V
V- = -20V
V+ = +15V
V- = -15V
20
0
1
0
-15
-10
-5
0
5
10
15
-20 -15 -10 -5
0
5
10 15 20
0
5
10 15 20 25 30 35 40
(V)
V
(V)
V
V
(V)
COM
COM
COM
CHARGE INJECTION
SWITCH ON-RESISTANCE vs. V
AND TEMPERATURE (SINGLE SUPPLY)
I
, I
, AND I
COM
D(ON) S(OFF) D(OFF)
vs. V
(DUAL SUPPLIES)
LEAKAGES vs. TEMPERATURE
COM
14
400
350
300
250
200
150
100
50
100n
10n
1n
T = +125°C
A
V+ = +15V
V- = -15V
T = +85°C
A
I
V
AT V = -14V,
NO
COM(OFF)
12
10
8
+14V
COM
=
I
AT V = +14V,
NO
COM(OFF)
COM = -14V
V
DUAL 15V
SUPPLIES
T = -40°C
A
T = +25°C
A
I
AT V
NO
= -14V
COM(ON)
COM
= V
I
AT V
NO
COM(ON)
= V
6
100p
10p
1p
= +14V
COM
T = -55°C
A
I
AT V = -14V,
NO
4
SINGLE +12V
NO(OFF)
V
= +14V
SUPPLY
COM
2
I
AT V = +14V,
NO
NO(OFF)
V+ = +12V
2
V
= -14V
COM
0
0
0
4
6
8
10
12
-15
-10
-5
0
5
10
15
-50 -25
0
25 50 75 100 125 150
V
(V)
V
(V)
TEMPERATURE (°C)
COM
COM
ON- AND OFF-TIMES
vs. TEMPERATURE
POWER-SUPPLY CURRENT vs.
TEMPERATURE
ON- AND OFF-TIMES
vs. SUPPLY VOLTAGE
1000
900
800
700
600
500
400
300
200
100
0
600
500
400
300
200
100
0
200
150
100
50
V+ = +15V
V- = -15V
= +5V
I+
t
ON
V
IN
t
ON
(DUAL SUPPLIES)
t
ON
(SINGLE SUPPLY)
I
GND
0
t
OFF
(SINGLE
-50
-100
-150
t
OFF
I-
SUPPLY)
t
OFF
(DUAL SUPPLIES)
0
5
10
15
20
-50 -25
0
25
50
75 100 125
-40 -20
0
20
40
60
80 100
SUPPLY VOLTAGE ( V)
TEMPERATURE (°C)
TEMPERATURE (°C)
6
_______________________________________________________________________________________
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
LOGIC-LEVEL THRESHOLD vs. V+
FREQUENCY RESPONSE
3.0
2.5
2.0
1.5
1.0
0.5
0
0
-10
ON LOSS
-20
-30
-40
-50
-60
-70
-80
-90
V+ = +15V
V- = -15V
-100
-110
0
5
10
15
20
25
30
35
0.01
0.1
1
10
100
1000
V+ (V)
FREQUENCY (MHz)
Pin Description
Detailed Description
PIN
SOT23-6
Overview of Traditional
Fault-Protected Switches
NAME
FUNCTION
µMAX
Positive Supply Voltage
Input
The MAX4510/MAX4520 are fault-protected CMOS
analog switches with unusual operation and construc-
tion. Traditional fault-protected switches are construct-
ed by three series FETs. This produces good off
characteristics, but fairly high on-resistance when the
signals are within about 3V of each supply rail. As the
voltage on one side of the switch approaches within
about 3V of either supply rail (a fault condition), the
switch impedance becomes higher, limiting the output
signal range (on the protected side of the switch) to
approximately 3V less than the appropriate polarity
supply voltage.
1
8
V+
Negative Supply Voltage
Input. Connect to GND for
single-supply operation.
2
5
V-
3
4
6
4
IN
Logic Control Digital Input
Ground
GND
Analog Switch Common
Terminal
5
1
COM
Fault-Protected Analog
Switch—normally closed
NC or NO (NC) for MAX4510;
normally open (NO) for
MAX4520
During a fault condition, the output current that flows
from the protected side of the switch into its load comes
from the fault source on the other side of the switch. If
the switch is open or the load is extremely high imped-
ance, the input current will be very low. If the switch is
on and the load is low impedance, enough current will
flow from the source to maintain the load voltage at 3V
less than the supply.
6
3
No Connection. Not inter-
nally connected.
—
2, 7
N.C.
_______________________________________________________________________________________
7
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
NORMALLY OPEN SWITCH CONSTRUCTION
V+
P2
HIGH
FAULT
P1
COM
NO
(NC)
N1
LOW
FAULT
ON
IN
GND
V-
N2
-ESD DIODE
NC SWITCH
MAX4510
MAX4520
Figure 1. Functional Diagram
When power is removed, the fault protection is still in
effect. In this case, the NO or NC terminals are a virtual
open circuit. The fault can be up to 40V.
Overview of MAX4510/MAX4520
The MAX4510/MAX4520 differ considerably from tradi-
tional fault-protection switches, with several advan-
tages. First, they are 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 beyond the supply rails to be
passed through the switch to the COM terminal, allow-
ing rail-to-rail signal operation. Third, when a signal on
NC or NO exceeds the supply rails by about 50mV (a
fault condition), the voltage on COM is limited to the
appropriate polarity supply voltage. Operation is identi-
cal for both fault polarities. The fault-protection extends
to 36V from GND.
The COM pin is not fault protected; it acts as a normal
CMOS switch pin. If a voltage source is connected to
the COM pin, it should be limited to the supply volt-
ages. Exceeding the supply voltage will cause high
currents to flow through the ESD protection diodes,
possibly damaging the device (see Absolute Maximum
Ratings).
Internal Construction
Internal construction is shown in Figure 1, with the ana-
log signal paths shown in bold. A single normally open
(NO) switch is shown; the normally closed (NC) config-
uration is identical except the logic-level translator
becomes an inverter. The analog switch is formed by
the parallel combination of N-channel FET N1 and P-
channel FET P1, which are driven on and off simultane-
ously according to the input fault condition and the
logic-level state.
During a fault condition, the NO or NC input pin
becomes high impedance regardless of the switch
state or load resistance. 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 typically source or sink up to 13mA.
8
_______________________________________________________________________________________
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
than 300mV, one of these diodes will conduct heavily.
During normal operation these reverse-biased ESD
diodes leak a few nanoamps of current to V+ and V-.
Normal Operation
Two comparators continuously compare the voltage on
the NO (or NC) pin with V+ and V-. When the signal on
NO or NC is between V+ and V-, the switch acts nor-
mally, with FETs N1 and P1 turning on and off in
response to IN signals. The parallel combination of N1
and P1 forms a low-value resistor between NO (or NC)
and COM so that signals pass equally well in either
direction.
Fault-Protection Voltage and Power Off
The maximum fault voltage on the NC or NO pins is
36V with power applied and 40V with power off.
Failure Modes
The MAX4510/MAX4520 are not lightning arrestors or
surge protectors.
Positive Fault Condition
When the signal on NO (or NC) exceeds V+ by about
50mV, the high-fault comparator output is high, turning
off FETs N1 and P1. This makes the NO (or NC) pin
high impedance regardless of the switch state. If the
switch state is “off,” all FETs are turned off and both NO
(or NC) and COM are high impedance. If the switch
state is “on,” FET P2 is turned on, sourcing current from
V+ to COM.
Exceeding the fault-protection voltage limits on NO or
NC, even for very short periods, can cause the device
to fail.
Ground
There is no connection between the analog signal path
and GND. The analog signal path consists 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.
Negative Fault Condition
When the signal on NO (or NC) exceeds V- by about
50mV, the low-fault comparator output is high, turning
off FETs N1 and P1. This makes the NO (or NC) pin
high impedance regardless of the switch state. If the
switch state is “off,” all FETs are turned off and both NO
(or NC) and COM are high impedance. If the switch
state is “on,” FET N2 is turned on, sinking current from
COM to V-.
V+ and GND power the internal logic and logic-level
translators and set the input logic thresholds. The logic-
level translators convert the logic levels to switched V+
and V- signals to drive the gates of the analog switch.
This drive signal is the only connection between the
power supplies and the analog signal. GND, IN, and
COM have ESD-protection diodes to V+ and V-.
IN Logic-Level Thresholds
The logic-level thresholds are CMOS and TTL compati-
ble when V+ is +15V. As V+ is raised, the threshold
increases slightly, and when V+ reaches 25V, the level
threshold is about 2.8V—above the TTL output high-
level minimum of 2.4V, but still compatible with CMOS
outputs (see Typical Operating Characteristics).
Transient Fault Response and Recovery
When a fast rise-time and fall-time transient on IN
exceeds V+ or V-, the output (COM) follows the input (IN)
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 out-
put recovery time delay. For positive faults, the recovery
time is typically 3.5µs. 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 recovery times.
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.
Dual Supplies
The MAX4510/MAX4520 operate with dual supplies
between 4.5V and 20V. The V+ and V- supplies
need not be symmetrical, but their difference cannot
exceed the absolute maximum rating of 44V.
COM and IN Pins
FETs N2 and P2 can source about 13mA from V+ or V-
to the COM pin in the fault condition. Ensure that if the
COM pin is connected to a low-resistance load, the
absolute maximum current rating of 30mA is never
exceeded, both in normal and fault conditions.
Single Supply
The MAX4510/MAX4520 operate from a single supply
between +9V and +36V when V- is connected to GND.
The GND, COM, and IN pins do not have fault protec-
tion. Reverse ESD-protection diodes are internally con-
nected between GND, COM, IN, and both V+ and V-. If a
signal on GND, COM, or IN exceeds V+ or V- by more
_______________________________________________________________________________________
9
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
Test Circuits/Timing Diagrams
V+
t < 20ns
t < 20ns
f
r
+3V
0V
V+
LOGIC
INPUT
50%
NO OR NC
V
V
OR
NO
NC
MAX4510
MAX4520
t
OFF
V
IN
IN
COM
V-
V
OUT
V
OUT
0.9 ·V
0.9 ·V
0UT
OUT
GND
50Ω
2k
35pF
SWITCH
OUTPUT
0V
t
ON
V-
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION.
Figure 2. Switch Turn-On/Turn-Off Times
V+
V+
0V
V+
V
IN
IN
NO OR NC
V
IN
50Ω
MAX4510
MAX4520
∆ V
OUT
V
OUT
V
COM
V-
OUT
C
GND
L
1000pF
V-
∆ V
IS THE MEASURED VOLTAGE DUE TO CHARGE-
OUT
TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.
V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION.
Q = ∆ VOUT · C
L
Figure 3. Charge Injection
10 ______________________________________________________________________________________
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
Test Circuits/Timing Diagrams (continued)
V+
V+
NO OR NC
MAX4510
MAX4520
1MHz
CAPACITANCE
ANALYZER
COM
V-
IN
V
IN
GND
V-
V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION.
Figure 4. COM, NO, and NC Capacitance
V+ 10nF
NETWORK
ANALYZER
V+
50Ω
50Ω
V
IN
COM
V
V
OUT
OFF-ISOLATION = 20log
ON-LOSS = 20log
MAX4510
MAX4520
V
IN
OUT
V
IN
V
OUT
MEAS
REF
IN
V
IN
NO, NC
V-
GND
50Ω
50Ω
10nF
V-
MEASUREMENTS ARE STANDARDIZED AGAINST SHORT 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.
V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION.
Figure 5. Frequency Response and Off-Isolation
Chip Information
TRANSISTOR COUNT: 139
______________________________________________________________________________________ 11
Rail-to-Rail, Fault-Protected,
SPST Analog Switches
Pin Configurations/Functional Diagrams/Truth Tables (continued)
COM
N.C.
NO
8
7
6
5
V+
N.C.
IN
1
2
3
4
COM
N.C.
NC
8
7
6
5
V+
N.C.
IN
1
2
3
4
MAX4520
MAX4510
V-
GND
V-
GND
µMAX
µMAX
IN
MAX4510
ON
MAX4520
OFF
N.C. = NOT CONNECTED
SWITCHES SHOWN FOR LOGIC "0" INPUT.
ALL SWITCHES ARE OFF WITH POWER REMOVED.
0
1
OFF
ON
________________________________________________________Package Information
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.
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Printed USA
is a registered trademark of Maxim Integrated Products.
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