MAX4506C Просмотр технического описания (PDF) - Maxim Integrated

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MAX4506C

Fault-Protected, High-Voltage Signal-Line Protectors

Maxim Integrated 

Fault-Protected, High-Voltage

Signal-Line Protectors

Pin Description

PIN

MAX4506

8-Pin

DIP/SO

1, 2, 3

MAX4507

18-Pin

DIP/SO

20-Pin

SSOP

1, 2, 3

1, 2, 4

NAME*

IN1, IN2, IN3

FUNCTION

Signal Inputs 1, 2, 3

—

4–8

5–9

IN4, IN5, IN6, IN7, IN8

Signal Inputs 4, 5, 6, 7, 8

4

9

10

V-

Negative Supply Voltage Input

—

10–14

11–15

OUT8, OUT7, OUT6, OUT5, OUT4

Signal Outputs 8, 7, 6, 5, 4

5, 6, 7

15, 16, 17 16, 17, 19

OUT3, OUT2, OUT1

Signal Outputs 3, 2, 1

8

18

20

V+

Positive Supply-Voltage Input

—

—

3, 18

N.C.

No Connection. Not internally connected.

* 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 over-

voltage 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 cir-

cuits 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 cir-

cuit draws excessive current and may continue to draw

excessive current even after the overvoltage condition

is removed. A continuous latchup condition may dam-

age the device permanently. Such “faults” are com-

monly 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, start-

up, or a power failure.

Figure 1 shows the normal complementary pair (N1 and

P1) found in many common analog switches. In addi-

tion 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-

-15V

COMPARATOR

-15V

N3

SENSE

SWITCH

N-CHANNEL

DRIVER

N1

IN

P3

SENSE

SWITCH

+15V

P1

P-CHANNEL

DRIVER

-V(-15V)

CLAMP N2

OUT

CLAMP P2

+V(+15V)

+15V

COMPARATOR

Figure 1. Simplified Internal Structure

tion, N1 and P1 remain on with a typical 65Ω on-resis-

tance between IN and OUT.

The on-board comparators and sensing circuitry moni-

tor the input voltage for possible overvoltage faults.

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