Datasheet MAX4506CPA, MAX4506C-D, MAX4507MJN, MAX4507EWN, MAX4507EPN Datasheet (Maxim)

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General Description

The MAX4506/MAX4507 multiple, two-terminal signal-line
protectors are pin-compatible with the industry-standard
MAX366/MAX367. These new circuit protectors feature
fault-protected inputs and Rail-to-Rail®signal handling
capability. The input pins are protected from overvoltage
faults up to ±36V with power on or ±40V with power off.
During a fault condition, the input terminal becomes an
open circuit and only nanoamperes of leakage current
flow from the source; but the switch output (OUT_) fur­nishes typically 19mA from the appropriate polarity sup­ply to the load. This ensures unambiguous rail-to-rail
outputs when a fault begins and ends.

The MAX4506 contains three independent protectors
while the MAX4507 contains eight independent protec­tors. They can protect both unipolar and bipolar analog
signals using either unipolar (+9V to +36V) or bipolar
(±8V to ±18V) power supplies.

These devices have no logic control inputs; the protec­tors are designed to be always-on when the supplies
are on. On-resistance is 100Ω max and matched within
7Ω, and on-leakage is less than 0.5nA at TA= +25°C.
The MAX4506 is available in 8-pin SO/DIP packages.
The MAX4507 is available in 20-pin SSOP and 18-pin
SO/DIP packages.

Applications

Process-Control Systems
Hot-Insertion Boards/Systems
Data-Acquisition Systems
Redundant/Backup Systems
ATE Equipment
Sensitive Instruments

Features

♦ Overvoltage Protection

±40V with Power Off
±36V with Power On

♦ Open Signal Paths with Power Off
♦ Output Clamps to Either Rail with an Input

Overvoltage

♦ Any On Channel Output is Not Affected

by an Overvoltage to Any Other Channel

♦ 100Ω max On-Resistance
♦ 10ns Overvoltage Turn-On Delay
♦ No Latchup During Power Sequencing
♦ Rail-to-Rail Signal Handling
♦ 500Ω Output Clamp Resistance During

Overvoltage

MAX4506/MAX4507

Fault-Protected, High-Voltage

Signal-Line Protectors

________________________________________________________________

Maxim Integrated Products

1

OUT2

OUT3V-

1

2

87V+

OUT1IN2

IN3

IN1

SO/DIP

3

4

6

5

MAX4506

TOP VIEW

Typical Operating Circuit

19-1415; Rev 1; 8/99

PART

MAX4506ESA
MAX4506EPA
MAX4506MJA -55°C to +125°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 SO
8 Plastic DIP
8 CERDIP**

Ordering Information continued at end of data sheet.

*

Contact factory for dice specifications.

**

Contact factory for availability.

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

Pin Configurations continued at end of data sheet.

Pin Configurations

Ordering Information

MAX4506CPA 0°C to +70°C 8 Plastic DIP
MAX4506C/D 0°C to +70°C Dice*

MAX4506CSA

0°C to +70°C 8 SO

SWITCHED +15V

P

MAX4506

IN1

17

IN2

26

IN3

3

4

V-

OUT1

OUT2

OUT3

V+

8

5

100k

OP AMP

-15V

+15V

MAX4506/MAX4507

Fault-Protected, High-Voltage
Signal-Line Protectors

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +15V, V- = -15V, 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.

(Voltages Referenced to GND)

V+........................................................................-0.3V to +44.0V

V- .........................................................................-44.0V to +0.3V

V+ to V-................................................................-0.3V to +44.0V

IN_ or OUT_ .........................................................................±44V

IN_ Overvoltage with Power On...........................................±36V

IN_ Overvoltage with Power Off...........................................±40V

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

Peak Current into Any Terminal

(pulsed at 1ms, 10% duty cycle).................................±70mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin Narrow SO (derate 5.88mW/°C above +70°C) ....471mW

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW

8-Pin CERDIP (derate 8.00mW/°C above +70°C) ...........640mW

18-Pin Wide SO (derate 9.52mW/ °C above +70°C) .......762mW

18-Pin Plastic DIP (derate 11.11mW/ °C above +70°C) ...889mW

18-Pin CERDIP (derate 10.53mW/ °C above +70°C) ......842mW

20-Pin SSOP (derate 11.11mW/°C above +70°C) ...........640mW

Operating Temperature Ranges

MAX4506C_A /MAX4607C_ _.............................0°C to +70°C

MAX4506E_A/MAX4607E_ _ ...........................-40°C to +85°C

MAX4506MJA/MAX4607MJN ........................-55°C to +125°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

RECOMMENDED OPERATING GUIDELINES

V+ to GND..............................................................-0.3V to +40V

V- to GND ...............................................................-32V to +0.3V

V+ to V- ..................................................................................40V

IN_........................................................................................±40V

OUT_ ...............................................................................V+ to V-

IN_ to OUT_..........................................................40V Differential

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

Peak Current into Any Terminal

(pulsed at 1ms, 10% duty cycle) .................................≤70mA

C

IN

Input Capacitance pF20VIN= 0, f = 1MHz +25°C

V

IN_

Fault-Protected Analog Signal
Range

V

-36 36

(Notes
2, 3)

C, E, MApplies with power on

-20 0.1 20

-40 40

nA

C, E, M

-200 200

C, E

+25°C

V

IN_

= ±25V, V

OUT_

= open

Applies with power off

I

IN_

Input Signal-Path Leakage
Current, Supplies On

-10 10

65 100

R

ON

V

V- V+

V

IN_

Fault-Free Analog Signal Range
(Note 4)

-400 400

I

OUT_ON

Signal-Path Leakage Current
(Note 7)

µA

-20 20

nA

-0.5 0.5

12

125

Ω

150

Analog Signal-Path Resistance

Ω

17

∆R

ON

Signal-Path Resistance Match
(Note 6)

10

UNITSMIN TYP MAXSYMBOLPARAMETER

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

IN_

= ±15V

V

OUT_

= ±10V, V

IN_

= ±10V or

floating

V

IN_

= ±10V, I

OUT_

= 1mA

V

IN_

= V

OUT_

= ±10V, I

OUT

= 1mA

CONDITIONS

+25°C

C, E, M

M

C, E

+25°C

M

C, E

M

+25°C

C, E

M

T

A

ANALOG SWITCH

FAULT PROTECTION

Note 1: OUT_ pins are not fault protected. Signals on OUT_ exceeding V+ or V- are clamped by internal diodes. Limit forward-diode

current to maximum current rating.

Note 2: IN_ pins are fault protected. Signals on IN_ exceeding -36V to +36V may damage the device. These limits apply with power

applied to V+ or V-, or ±40V with V+ = V- = 0.

µA

MAX4506/MAX4507

Fault-Protected, High-Voltage

Signal-Line Protectors

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—Single Supply

(V+ = +12V, V- = -0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)

ELECTRICAL CHARACTERISTICS —Dual Supplies (continued)

(V+ = +15V, V- = -15V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)

MAX4506

MAX4507

-20 0.2 20

-400

-300

MAX4506

MAX4507

400

-250 -160

Power-Supply Current

300

-200

160 250

200

175

-175

µA

90 150

-150 -90

I-

I+

V

IN_

= +15V

M

C, E

+25°C

M

C, E

+25°C

nA

-500 500

C, E

+25°C

V

IN_

= ±40V, V

OUT_

= open,

V+ = 0, V- = 0

I

IN_

Input Signal-Path Leakage
Current, Supplies Off

-10 10

M µA

13 19 26

mA

-26 -19 -13

+25°C

+25°CV

IN_

= +25V

I

OUT_

Output Clamp Current,
Supplies On

0.5 1.0

kΩ

0.4 1.0

+25°C

+25°C

UNITSMIN TYP MAXSYMBOLPARAMETER

I

OUT

= 1mAR

OUT_

Output Clamp Resistance,
Supplies On

V

IN_

= -25V

V

IN_

= +25V

V

IN_

= -25V

±8 ±18

C, E, M

+25°C ns

± Fault Output Turn-On Delay
Time (Note 5)

RL= 10kΩ, V

IN_

= ±25V

Power-Supply Range

CONDITIONS

V+, V-

M

C, E

+25°C

M

C, E

+25°C

T

A

2.5

V

10

µs+25°C± Fault Recovery Time (Note 5) RL= 10kΩ, V

IN_

= ±25V

125 200

R

ON

V

0V+

V

IN_

Fault-Free Analog Signal Range
(Note 4)

20

∆R

ON

Signal-Path Resistance Match
(Note 6)

15

Ω

312

250

Ω

300

Analog Signal-Path Resistance

UNITSMIN TYP MAXSYMBOLPARAMETER

V+ = +12V, V- = 0
V

IN_

= +12V

V

IN_

= +10V, I

OUT_

= 1mA

V

IN_

= +10V, I

OUT_

= 1mA

CONDITIONS

+25°C

C, E, M

M

C, E

+25°C

C, E

M

T

A

POWER SUPPLY

-400 400

I

OUT_(ON)

Signal-Path Leakage Current
(Note 7)

-20 20

nA

-0.5 0.05 0.5

V

IN

= +10V or floating

M

C, E

+25°C

ANALOG SWITCH

MAX4506/MAX4507

Fault-Protected, High-Voltage
Signal-Line Protectors

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—Single Supply (continued)

(V+ = +12V, V- = -0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)

RL= 10kΩ, V

IN_

= +25V± Fault Recovery Time (Note 5) +25°C µs

10

V

2.5

T

A

M

V+

CONDITIONS

Power-Supply Range

RL= 10kΩ, V

IN_

= +25V

± Fault Output Turn-On Delay
Time (Note 5)

ns+25°C

C, E, M

+9 +36

V

IN_

= 25V

PARAMETER SYMBOL MIN TYP MAX UNITS

Output Clamp Current,
Supply On

I

OUT_

+25°C

3 5.5 10

mA

µA

µA

M

-10 10

Input Signal-Path Leakage
Current, Supply Off (Note 9)

I

IN_

-10 10

V

IN_

= ±40V

+25°C

Input Signal-Path Leakage
Current, Supply On (Note 9)

I

IN_

C, E

-500 500

nA

+25°C

C, E

M

+25°C

C, E

M

V

IN_

= +12VI+

925

µA

30
40

17 40

60

Power-Supply Current

80

MAX4507

MAX4506

Applies with power off

V

IN_

= ±25V, V

OUT_

= 0

+25°C

C, E

-200 200

C, E, M

nA

-40 40

-20 0.2 20

-20 0.2 20

Applies with power on C, E, M

-36 36
V

Fault-Protected Analog Signal
Range (Notes 4, 5, 9)

V

IN_

V

IN_

= ±25V

Output Clamp Resistance,
Supply On

R

OUT_

+25°C

1.0 2.5

kΩ

Note 3: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 4: See Fault-Free Analog Signal Range vs. Supply Voltages graph in the

Typical Operating Characteristics

.

Note 5: Guaranteed by design.
Note 6: ∆R

ON

= R

ON(MAX)

- R

ON(MIN)

Note 7: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at TA= +25°C.
Note 8: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
Note 9: Guaranteed by testing with dual supplies.

POWER SUPPLY

FAULT PROTECTION

MAX4506/MAX4507

Fault-Protected, High-Voltage

Signal-Line Protectors

_______________________________________________________________________________________

5

0

20

60

40

100

120

80

140

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

ON-RESISTANCE vs. OUTPUT VOLTAGE

(DUAL SUPPLIES)

MAX4506/07 toc01

V

OUT_

(V)

R

ON

(Ω)

V+ = +18V

V- = -18V

V+ = +15V

V- = -15V

V+ = +10V
V- = -10V

V+ = +8V
V- = -8V

0

50

150

100

200

250

010155 20253035

ON-RESISTANCE vs. OUTPUT VOLTAGE

(SINGLE SUPPLY)

MAX4506/07 toc02

V

OUT_

(V)

R

ON

(Ω)

V+ = +12V

V+ = +9V

V+ = +20V

V+ = +30V

V+ = +36V

V- = 0V

20

0

40

80

60

100

120

-15 -5 0-10 5 10 15

ON-RESISTANCE vs. OUTPUT VOLTAGE

AND TEMPERATURE (DUAL SUPPLIES)

MAX4506/07 toc03

V

OUT_

(V)

R

ON

(Ω)

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

TA = +125°C

TA = +85°C

TA = +70°C

TA = +25°C

TA = -40°C

TA = -55°C

0

50

150

100

200

250

0462 8 10 12

ON-RESISTANCE vs. OUTPUT VOLTAGE

AND TEMPERATURE (SINGLE SUPPLY)

MAX4506/07 toc04

V

OUT_

(V)

R

ON

(Ω)

TA = +125°C

TA = +85°C

TA = +70°C

TA = +25°C

TA = -40°C

TA = -55°C

V+ = +12V
V- = 0

-20

-15

-10

-5

0

5

10

15

20

-30 -10-20 0 102030

OUTPUT TRANSFER CHARACTERISTICS

(DUAL SUPPLIES)

MAX4506/07 toc07

INPUT VOLTAGE (V)

OUTPUT CLAMP VOLTAGE (V)

(V+ = +18V, V- = -18V)

(V+ = +15V, V- = -15V)

(V+ = +10V, V- = -10V)
(V+ = +8V, V- = -8V)

(V+ = +8V, V- = -8V)

(V+ = +10V, V- = -10V)

(V+ = +15V, V- = -15V)

(V+ = +18V, V- = -18V)

OUTPUT LOAD = 1MΩ

INPUT VOLTAGE
LINEARLY SWEPT
BETWEEN -30V
AND +30V

0

0.2

0.1

0.5

0.4

0.3

0.7

0.6

0.8

-55 -5 25-35 -15 45 65 85 105 125

OUTPUT CLAMP RESISTANCE SUPPLIES ON

MAX4506/07 toc05

TEMPERATURE (°C)

R

OUT

(kΩ)

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

IN

= ±25V

VIN = +25V

VIN = -25V

-25

-15

-20

0

-5

-10

5

10

20

15

25

-55 -25 -10-40 5 20 35 50 65 80 95 110 125

OUTPUT CLAMP CURRENT SUPPLIES ON

vs. TEMPERATURE

MAX4506/07 toc06

TEMPERATURE (°C)

I

OUT

(mA)

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

0

5

10

15

20

25

30

35

40

0105 152025303540

OUTPUT TRANSFER CHARACTERISTICS

(SINGLE SUPPLY)

MAX4506/07 toc08

INPUT VOLTAGE (V)

OUTPUT CLAMP VOLTAGE (V)

INPUT VOLTAGE LINEARLY SWEPT
BETWEEN 0 AND 35V

OUTPUT LOAD = 1MΩ
V- = 0

V+ = +9V

V+ = +25V

V+ = +36V

V+ = +15V

V+ = +12V

-20

-15

-10

-5

0

5

10

15

20

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

FAULT-FREE ANALOG SIGNAL RANGE

vs. SUPPLY VOLTAGE

MAX4506/07 toc09

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

MAX4506/MAX4507

Fault-Protected, High-Voltage
Signal-Line Protectors

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(TA= +25°C, unless otherwise noted.)

0.01p

0.1p

10p

1p

1n

10n

100p

100n

-55 -5 20-30 45 70 95 120 145

FAULT-FREE OUTPUT LEAKAGE CURRENT

WITH SUPPLIES ON

MAX45506/07 toc10

TEMPERATURE (°C)

LEAKAGE CURRENT (A)

V

OUT

= ±10υ

I

OUT

(V+ = +15V, V- = -15V)

I

OUT

(V+ = +12V, V- = 0)

0.1p

1p

100p

10p

10n

100n

1n

1µ

-55 -15 5-35 25 45 65 85 105 125

INPUT FAULT LEAKAGE CURRENT

WITH SUPPLIES ON

MAX45506/07 toc11

TEMPERATURE (°C)

LEAKAGE CURRENT (A)

I

IN

AT +25V (V+ = +12V, V - = 0)

I

IN

AT +25V (V+ = +15V, V- = -15V)

50

-50

0

25

-25

125

-125

100

-100

75

-75

150

-150

-55 -15 5-35 25 45 65 85 105 125

MAX4506

POWER-SUPPLY CURRENT

vs. TEMPERATURE

MAX45506/07 toc12

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

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

I+

I-

I+ SINGLE SUPPLY +12V

50

-50

0

100

-100

150

-150

-200

200

-250

250

-55 -15 5-35 25 45 65 85 105 125

MAX4507

POWER-SUPPLY CURRENT vs.

TEMPERATURE

MAX45506/07 toc13

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

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

I+

I-

I+ SINGLE SUPPLY + 12V

20

-20

0

40

-40

60

-60

-80

80

-100

100

-15 5 010 5 10 15

SUPPLY CURRENT vs.

INPUT VOLTAGE

MAX45506/07 toc14

INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

I+

I-

10

-100

0.01 1 100.1 1000100

FREQUENCY RESPONSE

-90

MAX4506/07 toc15

FREQUENCY (MHz)

RESPONSE (dB)

-80

-70

-60

-50

-40

-30

-20

-10

0

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

CROSSTALK

BANDWIDTH

IN_

10V/div

+15V

-15V

+15V

0V

-15V

10V/div

OUT_

5µs/div

FAULT-FREE SIGNAL PERFORMANCE

MAX45506/07 toc16

FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING
WITH ±15V SUPPLIES

IN_

+25V

0V

+15V

0V

-25V

-15V

±25V OVERVOLTAGE INPUT WITH THE OUTPUT
CLAMPED AT ±15V

0V

OUT_

5µs/div

INPUT OVERVOLTAGE

vs. OUTPUT CLAMPING

MAX45506/07 toc17

IN_

5V/div

0V

+16V

+15V

0V

OUT_

5V/div

5µs/div

FAULT RECOVERY

MAX45506/07 toc18

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

MAX4506/MAX4507

Fault-Protected, High-Voltage

Signal-Line Protectors

_______________________________________________________________________________________ 7

8-Pin

DIP/SO

18-Pin

DIP/SO

NAME*

1, 2, 3 1, 2, 3 IN1, IN2, IN3

PIN

– 4–8 IN4, IN5, IN6, IN7, IN8

4 9 V-

– – N.C.

8 18 V+

5, 6, 7 15, 16, 17 OUT3, OUT2, OUT1

– 10–14 OUT8, OUT7, OUT6, OUT5, OUT4

Pin Description

FUNCTION

Signal Inputs 1, 2, 3

Signal Inputs 4, 5, 6, 7, 8

Negative Supply Voltage Input

No Connection. Not internally connected.

Positive Supply-Voltage Input

Signal Outputs 3, 2, 1

Signal Outputs 8, 7, 6, 5, 4

20-Pin

SSOP

1, 2, 4

5–9

10

3, 18

20

16, 17, 19

11–15

MAX4506 MAX4507

*

Connect all unused inputs to a hard voltage within the supply range (e.g., V+, V-, or GND).

Detailed Description

The MAX4506/MAX4507 protect other ICs from over­voltage by clamping its output voltage to the supply
rails. If the power supplies to the device are off, the
device clamps the output to 0V. The MAX4506/
MAX4507 provide protection for input signals up to
±36V with the power supplies on and ±40V with the
power supplies off.

The MAX4506/MAX4507 protect other integrated cir­cuits connected to its output from latching up. Latchup
is caused by parasitic SCR(s) within the IC turning on,
and can occur when the supply voltage applied to the
IC exceeds the specified operating range. Latchup can
also occur when signal voltage is applied before the
power-supply voltage. When in a latchup state, the cir­cuit draws excessive current and may continue to draw
excessive current even after the overvoltage condition
is removed. A continuous latchup condition may dam­age the device permanently. Such “faults” are com­monly encountered in modular control systems where
power supplies to interconnected modules may be
interrupted and reestablished at random. Faults can
happen during production testing, maintenance, start­up, or a power failure.

Figure 1 shows the normal complementary pair (N1 and
P1) found in many common analog switches. In addi­tion to these transistors, the MAX4506/MAX4507 also
contain comparators and sensing and clamping circuitry
to control the state of N1 and P1. During normal opera-

tion, N1 and P1 remain on with a typical 65Ω on-resis-
tance between IN and OUT.

The on-board comparators and sensing circuitry moni­tor the input voltage for possible overvoltage faults.

-15V

-15V

+15V

P-CHANNEL

DRIVER

N-CHANNEL

DRIVER

+15V

N3

P3

IN

N1

CLAMP

OUT

CLAMP

+V(+15V)

-V(-15V)

N2

P2

P1

COMPARATOR

COMPARATOR

SENSE

SWITCH

SENSE

SWITCH

Figure 1. Simplified Internal Structure

MAX4506/MAX4507

Fault-Protected, High-Voltage
Signal-Line Protectors

8 _______________________________________________________________________________________

Two clamp circuits limit the output voltage to within the
supply voltages. When the power supplies are off, any
input voltage applied at IN turns off both N1 and P1,
and OUT is clamped to 0V.

Normal Operation

When power is applied, each protector acts as a resis­tor in series with the signal path. Any voltage source on
the “input” side of the switch will be conducted through
the protector to the output (Figure 2).

When the output load is resistive, it draws current
through the protector. The internal resistance is typically
less than 100Ω. High-impedance loads are relatively
unaffected by the presence of the MAX4506/MAX4507.
The protector’s path resistance is a function of the supply
voltage and the signal voltage (see

Typical Operating

Characteristics

).

Fault Protection, Power Off

When power is off (i.e., V+ = V- = 0), the protector is a
virtual open circuit. With up to ±40V applied to the input
pin, the output pin will be 0V.

Fault Protection, Power On

A fault condition exists when the voltage on the IN_
exceeds either supply rail. This definition is valid when
power is on or off, as well as during all states while
power ramps up or down.

Applications Information

Supplying Power Through External ICs

The MAX4506/MAX4507 have low supply currents
(<250µA), which allows the supply pins to be driven by
other active circuitry instead of connected directly to
the power sources. In this configuration, the parts can
be used as driven fault-protected switches with V+ or
V- used as the control pins. For example, with the V­pin grounded, the output of a CMOS gate can drive the
V+ pin to turn the device on and off. This can effectively
connect and disconnect three (MAX4506) or eight
(MAX4507) separate signal lines at once. Ensure that
the driving source(s) does not drive the V+ pin more
negative than the V- pin.

Figure 3 shows a simple turn-on delay that takes
advantage of the MAX4506’s low power consumption.
The two RC networks cause gradual application of
power to the MAX4506, which in turn applies the input
signals smoothly after the amplifier has stabilized. The

two diodes discharge the two capacitors rapidly when
the power turns off. Note that the IC used to supply
power to the MAX4506/MAX4507 must be able to sup­ply enough current to maintain the load voltage at the
supply rail in a fault condition.

MAX4506

R

OUT

V

IN

IN1

V- V- V+V+

1

4

7

8

OUT1

Figure 2. Application Circuit

MAX4506

IN3

V-

-15V

V+

+15V

3

4

5

10µF

10µF

OUT3

IN2

26

OUT2

IN1

17

OUT1

8

100k

100k

OP AMP

Figure 3. Turn-On Delay

MAX4506/MAX4507

Fault-Protected, High-Voltage

Signal-Line Protectors

_______________________________________________________________________________________ 9

Protectors as Circuit Elements

Each of the protectors in a MAX4506/MAX4507 may be
used as a switched resistor, independent of the func­tions of other elements in the same package. For exam­ple, Figure 4 shows a MAX4506 with two of the
protectors used to protect the input of an op amp, and
the third element used to sequence a power supply.
Combining the circuits of Figures 3 and 4 produces a
delayed action on the switched +15V, as well as
smooth application of signals to the amplifier input.

Figure 5 shows MAX4506 used in front of a MAX338
unprotected 1-to-8 multiplexer. With supplies at ±15V,
V

OUT

of the MAX4506 clamps to ±15V; V

OUT

of the

MAX338 goes to ±14V. With supplies off, V

OUT

goes to

0V while the inputs remain at ±25V.

Use the MAX4506 with a MAX338 to enhance voltage
handling capability (Figure 6). The MAX4506 and
MAX338 share almost equal voltage drops in this con­figuration. For example, applying ±40V on pins 1 and 2
of the MAX4506 causes a voltage drop of about 26V
across pin 1 of the MAX4506 to pin 4 of the MAX338,
and a voltage drop of about 28V across pin 4 of the
MAX4506 to pin 8 of the MAX338. Similarly, there is a
26V drop from pin 2 of the MAX4506 to pin 5 of the
MAX338. The system’s performance exceeds each
individual part’s specification because of shared volt­age drops.

Multiplexer and Demultiplexer

As shown in Figure 7, the MAX4506 can be used in
series with the output of a MAX4508 (1-to-8 multiplexer)
to act as multiplexer or demultiplexer. The MAX4508 is a
fault-protected multiplexer whose inputs are designed to
interface with harsh environments; however, its common
output is not fault protected if connected to outside sig­nals (i.e., demultiplexer use). If the common output can
see fault signals, then it needs to be protected, and the
MAX4506 can be added to provide complete protection.

SWITCHED +15V

MAX4506

IN3

V-

-15V

V+

+15V

3

4

5

OUT3

IN2

26

OUT2

IN1

17

OUT1

8

P

100k

OP AMP

Figure 4. Power-Supply Sequencing

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

MAX4508

-15V

1

2

87+15V

NEW COM

3

4

6

5

MAX4506

A1

A2

GND

V+

NO5

NO6

NO7

NO9

A

O

EN

V-

O

+5V

+3V

+15V

-15V

NO3

NO1

NO2

NO4

COM

Figure 7. Multiplexer and Demultiplexer Application Using
MAX4506 (or MAX4507) with MAX4508

V

OUT

= -14V

+40V

-40V

10k

6

471

52

8

MAX338

MAX4506

Figure 6. SPDT Switch Application

Figure 5. Protecting a MAX338 with a MAX4506

+3V

OV

+25V

-25V

1

2

87+15V

MAX4506

3

-15V

4

6

5

+5V

-5V

R

L

1

A

O

2

EN

V-

3

4

NO1

NO2

5

NO3

6

NO4

7

V

8

OUT

MAX338

GND

NO5

NO6

NO7

NO9

16

A1

15

A2

14

+15V

V+

13

12

11

10

9

MAX4506/MAX4507

As seen in Figure 7, the signal input can now be put
into pin 1 of the MAX4506 (new common output for sys­tem), and outputs can be taken at MAX4508 pins 4 to
7, and 9 to 12. This is the classic demultiplexer opera­tion. This system now has full protection on both of the
multiplexers’ inputs and outputs.

Measuring Path Resistance

Measuring path resistance requires special techniques,
since path resistance varies dramatically with the IN
and OUT voltages relative to the supply voltages.
Conventional ohmmeters should not be used for the fol­lowing two reasons: 1) the applied voltage and currents
are usually not predictable, and 2) the true resistance is
a function of the applied voltage, which is dramatically
altered by the ohmmeter itself. Autoranging ohmmeters
are particularly unreliable.

Figure 8 shows a circuit that can give reliable results.
This circuit uses a 100mV voltage source, a low-volt­age-drop ammeter as the measuring circuit, and an
adjustable supply to sweep the analog voltage across
its entire range. The ammeter must have a voltage drop
of less than one millivolt (up to the maximum test cur­rent) for accurate results. A Keithley model 617 elec­trometer has a suitable ammeter circuit, appropriate
ranges, and a built-in voltage source designed for this
type of measurement. Find the path resistance by set­ting the analog voltage, measuring the current, and cal­culating the path resistance. Repeat the procedure at
each analog and supply voltage.

Note: It is important to use a voltage source of 100mV
or less. As shown in Figure 8, this voltage and the V

IN

voltage form the V

OUT

voltage. Using higher voltages

could cause OUT to go into a fault condition prematurely.

High-Voltage Surge Suppression

These devices are not high-voltage arresters, nor are
they substitutes for surge suppressors. However, the
MAX4506/MAX4507 can fill a vital gap in systems that
use these forms of protection (Figure 9). Although surge
suppressors are extremely fast shunt elements, they
have very soft current knees. Their clamp voltage must
be chosen well above the normal signal levels, because
they have excessive leakage currents as the analog
signal approaches the knee. This leakage current can
interfere with normal operation when signal levels are
low or impedance is high. If the clamp voltage is too
high, the input can be damaged.

Connecting a MAX4506/MAX4507 after a surge sup­pressor allows the surge-suppressor voltage to be set
above the supply voltage (but within the overvoltage
limits), dramatically reducing leakage effects (Figure 9).
During a surge, the surge suppressor clamps the input
voltage roughly to the ±10V supplies.

Fault-Protected, High-Voltage
Signal-Line Protectors

10 ______________________________________________________________________________________

MAX4506

V

OUT

V

IN

IN1

V- V+V+

100mV

PATH RESISTANCE = 100mv/A

ADJUSTABLE

ANALOG

VOLTAGE

84

OUT1

A

Figure 8. Path-Resistance Measuring Circuit

Figure 9. Surge-Suppression Circuit

IN1

17

IN2

26

IN3

3

4

V-

SURGE SUPPRESSORS

-15V

MAX4506

OUT1

OUT2

OUT3

+10V

8

V+

OP AMP

5

-10V

MAX4506/MAX4507

Fault-Protected, High-Voltage

Signal-Line Protectors

______________________________________________________________________________________ 11

Ordering Information (continued)

Chip Topographies

20 SSOP

MAX4507CAP

18 Plastic DIPMAX4507CPN

18 SOMAX4507CWN

18 SO

20 SSOP

Dice*

MAX4507EWN

MAX4507EAP

MAX4507C/D

18 Plastic DIPMAX4507EPN
18 CERDIP**MAX4507MJN

*

Contact factory for dice specifications.

**

Contact factory for availability.

PART PIN-PACKAGETEMP. RANGE

0°C to +70°C

0°C to +70°C

0°C to +70°C

-40°C to +85°C

-40°C to +85°C

0°C to +70°C

-40°C to +85°C

-55°C to +125°C

OUT1

OUT2

OUT3

0.112"

(2.84mm)

0.071"

(1.80mm)

V+

IN1

IN2

IN3

V-

0.112"

(2.84mm)

0.071"

(1.800mm)

V-

OUT8

OUT7

OUT6

OUT5

OUT4

OUT3

OUT2

IN1 V+

OUT1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

MAX4506

MAX4507

TRANSISTOR COUNT:

144 (MAX4506)
379 (MAX4507)

SUBSTRATE CONNECTED TO V+

MAX4506/MAX4507

Fault-Protected, High-Voltage
Signal-Line Protectors

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.

Package Information

SSOP.EPS

Pin Configurations (continued)

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

V+

OUT1

OUT2

OUT3IN4

IN3

IN2

IN1

OUT4

OUT5

OUT6

OUT7IN8

IN7

IN6

IN5

109 OUT8V-

SO/DIP

MAX4507

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

V+

OUT1

N.C.

OUT2IN3

N.C.

IN2

IN1

OUT3

OUT4

OUT5

OUT6IN7

IN6

IN5

IN4

12

11

9

10

OUT7

OUT8V-

IN8

MAX4507

SSOP

TOP VIEW