Datasheet MAX4510, MAX4520 Datasheet (MAXIM)

General Description

The MAX4510/MAX4520 single-pole/single-throw (SPST),
fault-protected analog switches feature a fault-protected
input and Rail-to-Rail®signal-handling capability. The
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 condi­tion, 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) fur­nishes 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.

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.

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.

Applications

Data Acquisition

Industrial and Process-Control Systems

Avionics

ATE Equipment

Redundant/Backup Systems

Features

♦ ±40V Fault Protection with Power Off

±36V Fault Protection with ±15V Supplies

♦ Switch is Off with Power Removed

♦ Rail-to-Rail Signal Handling

♦ 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

♦ 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

Single +9V to +15V or ±15V Supplies

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,

SPST Analog Switches

________________________________________________________________ Maxim Integrated Products 1

19-1542; Rev 0; 10/99

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

Ordering Information

PART TEMP. RANGE

PIN-

PACKAGE

MAX4520EUT-T

-40°C to +85°C 6 SOT23-6

MAX4510EUT-T

-40°C to +85°C 6 SOT23-6

MAX4510EUA

-40°C to +85°C 8 µMAX

Pin Configurations continued at end of data sheet.

MAX4520EUA

-40°C to +85°C 8 µMAX

Pin Configurations/Truth Tables

IN MAX4510 MAX4520

0 ON OFF

1 OFF ON

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

—

TOP

MARK

AADK

AABZ

—

TOP VIEW

1

V+

V-

IN

( ) ARE FOR MAX4520.

SWITCHES SHOWN FOR LOGIC "0" INPUT.
ALL SWITCHES ARE OFF WITH POWER REMOVED.

MAX4510

2

MAX4520

3

SOT23

6

5

4

NC (NO)

COM

GND

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,
SPST Analog Switches

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—Dual Supplies

(

V+ = +15V, V- = -15V, GND = 0, VIH= 2.4V, VIL= 0.8V, TA =T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA=

+25°C.) (Note 3)

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.

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.

(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+ - 36V) to (V- + 36V)

NC, NO to COM.......................................................-36V to +36V

Continuous Current into Any Terminal..............................±30mA

Peak Current into Any Terminal

(pulsed at 1ms, 10% duty cycle)...................................±50mA

Continuous Power Dissipation (T

A

= +70°C) (Note 2)

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

E

+25°C -20 0.1 20

-200 200

NO or NC Input Leakage
Current, Supplies Off

INO, I

NC

nA

VNOor VNC= ±40V,
V+ = 0, V- = 0

E

+25°C -20 20

-200 200

NO or NC Input Leakage
Current, Supplies On

INO, I

NC

nA

VNOor VNC= ±36V,
V

COM

=

–

+

10V

E

VNOor VNC= -36V

+25°C

81113

-12 -10 -7

Clamp Output Current,
Supplies On

I

COM

mA

VNOor VNC= 36V

+25°C -10 10

-200 200

COM Off-Leakage Current,
Supplies On

I

COM(OFF)

nAVNOor VNC= ±36V

Applies with power off (Note 6)

E

-36 36

-40 40

Fault-Protected Analog
Signal Range

VNO, V

NC

V

Applies with power on (Note 6)

-20 20E

-10 10

+25°C

E

-10 10E

225E

125 160

+25°C -0.5 0.01 0.5

COM On-Leakage Current
(Notes 4, 5)

I

COM(ON)

nA

V

COM

= ±14V; VNO, VNC=

±14V or unconnected

+25°C -0.5 0.01 0.5

I

NO(OFF),

I

NC(OFF)

nA

NO or NC Off-Leakage Current
(Notes 4, 5)

V

COM

= ±14V;

V

NO,VCOM

=

–

+14V

COM Off-Leakage Current
(Notes 4, 5)

+25°C

Fault-Free Analog Signal Range VNO, V

NC

V- V+ VEApplies with power on or off

T

A

PARAMETER SYMBOL MIN TYP MAX UNITS

On-Resistance R

ON

Ω

-0.5 0.01 0.5

I

COM(OFF)

nA

CONDITIONS

V

COM

= ±10V, I

COM

= 1mA

V

COM

= ±14V;

V

NO,VNC

=

–

+14V

ANALOG SWITCH

FAULT (V+ = +15V, V- = -15V, unless otherwise noted.)

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)

(

V+ = +15V, V- = -15V, VIH= 2.4V, VIL= 0.8V, GND = 0, TA =T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA=

+25°C.) (Note 3)

175

10

E

E

VIN= 5V

50 100+25°C

+25°C -1 0.01 1

GND Supply Current I

GND

µA

VIN= 0 or 15V

175E

+25°C 50 100

V- Supply Current I- µAVIN= 0 or 5V

250E

+25°C 100 175

V+ Supply Current I+ µAVIN= 0 or 5V

E ±4.5 ±20Power-Supply Range V+, V- V

250E

600E

10

Fault Output Turn-On
Delay Time

ns+25°C

V- - 0.4 V+ + 0.4+25°CFault Trip Threshold V

VIN= ±25V, RL= 10kΩ

EIN Input Logic Low V

INL

V0.8

+25°C -62Off-Isolation (Note 8) VC

ISO

dB

RL= 50Ω, CL= 15pF,
VN_= 1V

RMS

, f = 1MHz, Figure 5

+25°C 10COM On-Capacitance C

COM(ON)

pFf = 1MHz, Figure 4

+25°C 5COM Off-Capacitance C

COM(OFF)

pFf = 1MHz, Figure 4

+25°C 10NO or NC Off-Capacitance C

N(OFF)

pFf = 1MHz, Figure 4

+25°C 1.5 5Charge Injection (Note 7) Q pC

CL= 1nF, VNO= 0,
RS = 0Ω, Figure 3

3

+25°C

ns

VNOor V

NC

= ±10V, RL= 2kΩ,

CL= 35pF, Figure 2

60 175

Turn-Off Time t

OFF

ns

VNOor V

NC

= ±10V, RL= 2kΩ,

CL= 35pF, Figure 2

350 500

-5 5E

E

+25°C

IN Input Current I

INH

, I

INL

µAVIN= 0.8V or 2.4V

-1 0.03 1

+25°C

EIN Input Logic High V

INH

V2.4

T

A

+25°C

PARAMETER SYMBOL MIN TYP MAX UNITS

1 2.5

Clamp Output Resistance,
Supplies On

R

COM

kΩ

Turn-On Time t

ON

CONDITIONS

VNOor VNC= ±36V

2.5Fault Recovery Time µs+25°CVIN= ±25V, RL= 10kΩ

LOGIC INPUT

SWITCH DYNAMIC CHARACTERISTICS

POWER SUPPLY

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,
SPST Analog Switches

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—Single +12V Supply

(V+ = +12V, V- = 0, GND = 0, VIH= 2.4V, VIL= 0.8V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

(Note 3)

-5 5E

E 0.8IN Input Logic Low V

INL

V

E 2.4IN Input Logic High V

INH

V

+25°C -1 0.03 1

IN Input Current I

INH

, I

INL

µAVIN= 0.8V or 2.4V

On-Resistance

0V+

-40 40

-36 36

Fault-Protected Analog
Signal Range

VNO, V

NC

Applies with power off (Note 6)

VE

Applies with power on (Note 6)

+25°C -10 10

COM Off-Leakage Current,
Supply On

I

COM

nA

E -200 200

VNOor VNC= ±36V

+25°C 2.4 5

Clamp Output Resistance,
Supply On

R

COM

kΩVNOor VNC= 36V

+25°C

Clamp Output Current,
Supply On

I

COM

mA235VNOor VNC= 36V

+25°C -20 0.1 20

NO or NC Input Leakage
Current, Supply Off

INO, I

NC

nA

E -200 200

VNOor VNC= ±40V,
V+ = 0, V- = 0

+25°C -20 20

NO or NC Input Leakage
Current, Supply On

INO, I

NC

nA

E -200 200

VNOor VNC= ±36V,
V

COM

= 0

+25°C -0.5 0.01 0.5

COM On-Leakage Current
(Notes 4, 5, 9)

I

COM(ON)

nA

E -20 20

V

COM

= 1V, 10V; VNO, V

NC

=

1V, 10V, or unconnected

E -10 10

E -10 10

500

260 390+25°C

T

A

E

+25°C

PARAMETER SYMBOL MIN TYP MAX UNITS

R

ON

Ω

-0.5 0.01 0.5

COM Off-Leakage Current
(Notes 4, 5, 9)

I

COM(OFF)

nA

+25°C -0.5 0.01 0.5

NO or NC Off-Leakage Current
(Notes 4, 5, 9)

I

NO(OFF),

I

NC(OFF)

nA

V

COM

= 10V, 1V;

V

NO

, V

NC

= 1V, 10V

CONDITIONS

V

COM

= 10V,

I

COM

= 1mA

V

COM

= 1V, 10V;

VNO, V

NC

= 10V, 1V

Fault-Free Analog Signal Range VNO, V

NC

VEApplies with power on or off

ANALOG SWITCH

FAULT

LOGIC INPUT

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________ 5

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

A

= +25°C.

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

10

[ V

COM

/ (VNCor VNO) ], V

COM

= output, VNCor VNO= input to off switch.

Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.

ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)

(V+ = +12V, V- = 0, GND = 0, VIH= 2.4V, VIL= 0.8V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

(Note 3)

µA

175

125

E

E

E 175

+25°C 50 125

µA

VIN= 0 or 5V

+25°C 25 75

V- and GND Supply Current I

GND

VIN= 0 or 12V

+25°C 50 125

V+ Supply Current I+ µAVIN= 0 or 5V

E 936Power-Supply Range V+ V

+25°C -62Off-Isolation (Note 8) V

ISO

dB

RL= 50Ω, CL= 15pF,
V

IN

= 1V

RMS

, f = 1MHz, Figure 5

+25°C 22COM On-Capacitance C

COM(ON)

pF

V

COM

= VNO= 0,

f = 1MHz, Figure 4

+25°C 9COM Off-Capacitance C

COM(OFF)

pFV

COM

= 0, f = 1MHz, Figure 4

+25°C 9NO or NC Off-Capacitance

C

NO(OFF)

,

C

NC(OFF)

pFf = 1MHz, Figure 4

+25°C 15Charge Injection (Note 7) Q pC

CL= 1nF, VNO= 0,
RS= 0Ω, Figure 3

300

1000E

E

T

A

+25°C

PARAMETER SYMBOL MIN TYP MAX UNITS

+25°C 60 200

Turn-Off Time t

OFF

ns

V

NO

or VNC= 7V, RL= 2kΩ,

CL= 35pF, Figure 2

500 750

Turn-On Time t

ON

ns

CONDITIONS

V

NO

or VNC= 7V, RL= 2kΩ,

CL= 35pF, Figure 2

SWITCH DYNAMIC CHARACTERISTICS

POWER SUPPLY

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,
SPST Analog Switches

6 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

1000

1

10

V

COM

(V)

SWITCH ON-RESISTANCE (Ω)

SWITCH ON-RESISTANCE

vs. V

COM

(SINGLE SUPPLY)

010155 2025303540

V+ = +5V

V+ = +36V

V+ = +12V

V+ = +15V

V+ = +20V

V+ = +24V

V+ = +30V

MAX4510-03

0

100

50

250

200

150

300

350

-20 -5 0-15 -10 5 10 15 20

SWITCH ON-RESISTANCE

vs. V

COM

(DUAL SUPPLIES)

MAX4510-01

V

COM

(V)

SWITCH ON-RESISTANCE (Ω)

V+ = +5V

V- = -5V

V+ = +10V

V- = -10V

V+ = +15V

V- = -15V

V+ = +12V

V- = -12V

V+ = +20V
V- = -20V

0

80

60

20

40

160

140

100

120

180

200

-15 -5 0-10 5 10 15

SWITCH ON-RESISTANCE vs. V

COM

AND

TEMPERATURE (DUAL SUPPLIES)

MAX4510-02

V

COM

(V)

SWITCH ON-RESISTANCE (Ω)

TA = +125°C

TA = -55°C

V+ = +15V

V- = -15V

TA = -40°C

TA = +25°C

TA = +85°C

0

50

200

150

100

300

350

250

400

0462 8 10 12

SWITCH ON-RESISTANCE vs. V

COM

AND TEMPERATURE (SINGLE SUPPLY)

MAX4510-04

V

COM

(V)

SWITCH ON-RESISTANCE (Ω)

TA = +125°C

TA = +85°C

TA = +25°C

TA = -40°C

TA = -55°C

V+ = +12V

0

300

200

100

700

800

600

500

400

900

1000

0 5 10 15 20

ON- AND OFF-TIMES

vs. SUPPLY VOLTAGE

MAX4510-07

SUPPLY VOLTAGE (±V)

t

ON

, t

OFF

(ns)

t

ON

(SINGLE SUPPLY)

t

ON

(DUAL SUPPLIES)

t

OFF

(DUAL SUPPLIES)

t

OFF

(SINGLE
SUPPLY)

1p

10p

100p

1n

10n

100n

-50 0-25 25 50 75 100 125 150

I

D(ON)

, I

S(OFF)

, AND I

D(OFF)

LEAKAGES vs. TEMPERATURE

MAX4510-05

TEMPERATURE (°C)

LEAKAGE (A)

I

NO(OFF)

AT V

NO

= -14V,

V

COM

= +14V

I

COM(ON)

AT V

NO

= V

COM

= +14V

I

NO(OFF)

AT V

NO

= +14V,

V

COM

= -14V

I

COM(OFF)

AT V

NO

= -14V,

V

COM

=

+14V

I

COM(OFF)

AT V

NO

= +14V,

V

COM

= -14V

I

COM(ON)

AT V

NO

= V

COM

= -14V

0

2

8

10

6

4

12

14

-15 -10 -5 0 5 10 15

CHARGE INJECTION

vs. V

COM

(DUAL SUPPLIES)

MAX4510-06

V

COM

(V)

Q (pC)

DUAL ±15V

SUPPLIES

SINGLE +12V

SUPPLY

V+ = +15V
V- = -15V

0

100

300

200

500

400

600

-50 0 25-25 50 75 100 125

ON- AND OFF-TIMES

vs. TEMPERATURE

MAX4510-08

TEMPERATURE (°C)

t

ON

, t

OFF

(ns)

t

ON

t

OFF

-150

-50

-100

50

0

150

100

200

-40 0 20-20 40 60 80 100

POWER-SUPPLY CURRENT vs.

TEMPERATURE

MAX4510/20 toc 09

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

I+

I-

I

GND

V+ = +15V
V- = -15V
V

IN

= +5V

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(TA= +25°C, unless otherwise noted.)

0

-100

0.01 1 100.1 1000

FREQUENCY RESPONSE

MAX4510/20 TOC11

FREQUENCY (MHz)

LOSS (dB)

-90

-80

-70

-60

-50

-40

-30

-20

-10

100

-110

OFF LOSS

ON LOSS

V+ = +15V

V- = -15V

Pin Description

Detailed Description

Overview of Traditional

Fault-Protected Switches

The MAX4510/MAX4520 are fault-protected CMOS
analog switches with unusual operation and construc­tion. Traditional fault-protected switches are construct­ed 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.

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 imped­ance, 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.

1

3

2, 7

µMAX

4

6

PIN

5

8

SOT23-6

Analog Switch Common
Terminal

COM5

Fault-Protected Analog
Switch—normally closed
(NC) for MAX4510;
normally open (NO) for
MAX4520

NC or NO6

No Connection. Not inter­nally connected.

N.C.—

GroundGND4

Logic Control Digital InputIN3

Negative Supply Voltage
Input. Connect to GND for
single-supply operation.

V-2

Positive Supply Voltage
Input

V+1

FUNCTIONNAME

LOGIC-LEVEL THRESHOLD vs. V+

3.0

2.5

2.0

1.5

1.0

LOGIC-LEVEL THRESHOLD (V)

0.5

0

010155 20253035

V+ (V)

MAX4511-10

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,
SPST Analog Switches

8 _______________________________________________________________________________________

Overview of MAX4510/MAX4520

The MAX4510/MAX4520 differ considerably from tradi­tional fault-protection switches, with several advan­tages. 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, allow­ing 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 identi­cal for both fault polarities. The fault-protection extends
to ±36V from GND.

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.

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.

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 volt­ages. 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 ana­log signal paths shown in bold. A single normally open
(NO) switch is shown; the normally closed (NC) config­uration 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 P­channel FET P1, which are driven on and off simultane­ously according to the input fault condition and the
logic-level state.

Figure 1. Functional Diagram

NORMALLY OPEN SWITCH CONSTRUCTION

V+

HIGH

FAULT

P2

P1

NO

(NC)

LOW

FAULT

IN

GND

V-

-ESD DIODE
NC SWITCH

ON

COM

N1

N2

MAX4510
MAX4520

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,

SPST Analog Switches

_______________________________________________________________________________________ 9

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 nor­mally, 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.

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.

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-.

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 out­put 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.

COM and IN Pins

FETs N2 and P2 can source about ±13mA from V+ or V­to 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.

The GND, COM, and IN pins do not have fault protec­tion. Reverse ESD-protection diodes are internally con­nected between GND, COM, IN, and both V+ and V-. If a
signal on GND, COM, or IN exceeds V+ or V- by more

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-.

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.

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 N­channel 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 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 compati­ble 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 high­level minimum of 2.4V, but still compatible with CMOS
outputs (see 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.

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.

Single Supply

The MAX4510/MAX4520 operate from a single supply
between +9V and +36V when V- is connected to GND.

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,
SPST Analog Switches

10 ______________________________________________________________________________________

Figure 3. Charge Injection

Figure 2. Switch Turn-On/Turn-Off Times

Test Circuits/Timing Diagrams

V+

V+

MAX4510

V

IN

50Ω

V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION.

MAX4520

IN

GND

V

IN

IN

50Ω

MAX4510
MAX4520

V+

V+

GND

NO OR NC

COM

V-

V-

NO OR NC

COM

V-

+3V

OR

V

NO

V

NC

V

OUT

2k

C

L

1000pF

V

35pF

OUT

LOGIC

INPUT

SWITCH
OUTPUT

0V

0V

V

IN

V

OUT

50%

V

OUT

0.9 · V

0UT

t

ON

LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.

V+

0V

tr < 20ns
tf < 20ns

t

OFF

0.9 · V

OUT

∆ V

OUT

V-

V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION. Q = ∆ V

∆ V

IS THE MEASURED VOLTAGE DUE TO CHARGE-

OUT

TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.

· C

OUT

L

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,

SPST Analog Switches

______________________________________________________________________________________ 11

Figure 4. COM, NO, and NC Capacitance

Test Circuits/Timing Diagrams (continued)

Figure 5. Frequency Response and Off-Isolation

TRANSISTOR COUNT: 139

Chip Information

IN

V

IN

V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION.

V+

10nF

V+

V+

MAX4510
MAX4520

GND

NO OR NC

COM

V-

V-

1MHz

CAPACITANCE

ANALYZER

V+

COM

MAX4510
MAX4520

IN

V

IN

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.

GND

10nF

NO, NC

V-

V-

NETWORK
ANALYZER

V

IN

V

OUT

50Ω

MEAS REF

50Ω 50Ω

50Ω

OFF-ISOLATION = 20log

ON-LOSS = 20log

V

OUT

V

IN

V

OUT

V

IN

MAX4510/MAX4520

Rail-to-Rail, Fault-Protected,
SPST Analog Switches

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.

Pin Configurations/Functional Diagrams/Truth Tables (continued)

ONOFF1

OFFON0

MAX4520MAX4510IN

________________________________________________________Package Information

COM

1

N.C.

2

NC

3

MAX4510

4

GND

µMAX

N.C. = NOT CONNECTED
SWITCHES SHOWN FOR LOGIC "0" INPUT.
ALL SWITCHES ARE OFF WITH POWER REMOVED.

COM

N.C.

NO

GND

1

2

3

MAX4520

4

8

V+

N.C.

7

IN

6

5

V-

µMAX

8

V+

N.C.

7

IN

6

5

V-

6LSOT.EPS