Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX4507EAP+

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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_) fur-

nishes typically 19mA from the appropriate polarity sup-

ply 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 protec-

tors. 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 protec-

tors 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 T

= +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-

V+

OUT1IN2

IN3

IN1

SO/DIP

MAX4506

TOP VIEW

SWITCHED +15V

MAX4506

IN3

V-

-15V

V+

+15V

OUT3

IN2

OUT2

IN1

OUT1

100k

OP AMP

Typical Operating Circuit

19-1415; Rev 2; 2/03

PART

MAX4506ESA

MAX4506EPA

MAX4506MJA -55°C to +125°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

Summary of content (12 pages)

PAGE 1
9-1415; Rev 2; 2/03 Fault-Protected, High-Voltage Signal-Line Protectors 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.
PAGE 2
MAX4506/MAX4507 Fault-Protected, High-Voltage Signal-Line Protectors 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 IN_ or OUT_ .........................................................................
PAGE 3
Fault-Protected, High-Voltage Signal-Line Protectors (V+ = +15V, V- = -15V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER Input Signal-Path Leakage Current, Supplies Off SYMBOL IIN_ Output Clamp Current, Supplies On IOUT_ Output Clamp Resistance, Supplies On ROUT_ CONDITIONS VIN_= ±40V, VOUT_ = open, V+ = 0, V- = 0 TA MIN TYP MAX +25°C -1 0.
PAGE 4
MAX4506/MAX4507 Fault-Protected, High-Voltage Signal-Line Protectors ELECTRICAL CHARACTERISTICS—Single Supply (continued) (V+ = +12V, V- = -0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Fault-Protected, High-Voltage Signal-Line Protectors ON-RESISTANCE vs. OUTPUT VOLTAGE (SINGLE SUPPLY) 100 200 RON (Ω) 60 V+ = +20V 100 100 V+ = +18V V- = -18V 20 TA = +125°C TA = +85°C TA = +70°C 60 TA = +25°C TA = -40°C 40 V+ = +30V 40 V+ = +15V V- = -15V 80 150 50 MAX4506/07 toc03 V+ = +9V 120 V+ = +12V V+ = +15V V- = -15V 80 V- = 0V RON (Ω) 120 RON (Ω) V+ = +8V V- = -8V V+ = +10V V- = -10V 250 MAX4506/07 toc01 140 ON-RESISTANCE vs.
PAGE 6
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) IOUT (V+ = +12V, V- = 0) 10p 10n 1n 100p 1p IIN AT +25V (V+ = +12V, V - = 0) 10p 0.1p 0.1p -30 -5 20 45 70 95 120 145 5 25 45 65 MAX4507 POWER-SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT vs.
PAGE 7
Fault-Protected, High-Voltage Signal-Line Protectors PIN MAX4506 MAX4507 NAME* FUNCTION 8-Pin DIP/SO 18-Pin DIP/SO 20-Pin SSOP 1, 2, 3 1, 2, 3 1, 2, 4 IN1, IN2, IN3 — 4–8 5–9 IN4, IN5, IN6, IN7, IN8 4 9 10 V- — 10–14 11–15 OUT8, OUT7, OUT6, OUT5, OUT4 5, 6, 7 15, 16, 17 16, 17, 19 OUT3, OUT2, OUT1 8 18 20 V+ — — 3, 18 N.C.
PAGE 8
MAX4506/MAX4507 Fault-Protected, High-Voltage Signal-Line Protectors 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 MAX4506 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).
PAGE 9
Fault-Protected, High-Voltage Signal-Line Protectors Figure 5 shows MAX4506 used in front of a MAX338 unprotected 1-to-8 multiplexer. With supplies at ±15V, VOUT of the MAX4506 clamps to ±15V; VOUT of the MAX338 goes to ±14V. With supplies off, VOUT goes to 0V while the inputs remain at ±25V. SWITCHED +15V P +15V MAX4506 V+ 8 1 IN1 OUT1 7 2 IN2 OUT2 6 Use the MAX4506 with a MAX338 to enhance voltage handling capability (Figure 6).
PAGE 10
MAX4506/MAX4507 Fault-Protected, High-Voltage Signal-Line Protectors 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.
PAGE 11
Fault-Protected, High-Voltage Signal-Line Protectors PART TEMP RANGE PIN-PACKAGE MAX4507CAP 0°C to +70°C 20 SSOP MAX4507CWN 0°C to +70°C 18 SO MAX4507CPN 0°C to +70°C 18 Plastic DIP MAX4507C/D 0°C to +70°C Dice* MAX4507EAP MAX4507EWN MAX4507EPN MAX4507MJN -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C 20 SSOP 18 SO 18 Plastic DIP 18 CERDIP** *Contact factory for dice specifications. **Contact factory for availability.
PAGE 12
Pin Configurations (continued) TOP VIEW IN1 1 18 V+ IN1 1 20 V+ IN2 2 17 OUT1 IN2 2 19 OUT1 IN3 3 16 OUT2 N.C. 3 18 N.C. 15 OUT3 IN3 4 14 OUT4 IN4 5 13 OUT5 IN5 6 15 OUT4 12 OUT6 IN6 7 14 OUT5 IN8 8 11 OUT7 IN7 8 13 OUT6 V- 9 10 OUT8 IN8 9 12 OUT7 V- 10 11 OUT8 IN4 4 IN5 5 MAX4507 IN6 6 IN7 7 17 OUT2 MAX4507 16 OUT3 SO/DIP SSOP Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications.