MAX367C Просмотр технического описания (PDF) - Maxim Integrated

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MAX367C

Signal-Line Circuit Protectors

Maxim Integrated 

Signal-Line Circuit Protectors

__High-Voltage Surge Suppression

These devices are not high-voltage arresters, nor are they

substitutes for surge suppressers. In systems that use

these forms of protection, however, the MAX366/MAX367

can fill a vital gap. Figure 7 shows a typical circuit.

Although the surge suppressers 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 knee is approached. This current can interfere with

normal operation when signal levels are low or imped-

ances are high. If the clamp voltage is too high, however,

the input can be damaged.

Using a MAX366/MAX367 after the surge suppresser

allows the surge-suppresser voltage to be set above

the supply voltage (but within the overvoltage limits),

dramatically reducing the effects of leakage (Figure 7).

During a surge, the surge suppresser clamps the input

voltage to roughly ±10V. This protects the

MAX366/MAX367, but the MAX366/MAX367 still dis-

connect the signal from the op amp well within the ±5V

supply.

+5V

MAX366

8

V+

1 IN1

OUT1 7

2 IN2

3 IN3

4 V-

OUT2 6

OUT3 5

OP AMP

SURGE SUPPRESSERS

-5V

(+10V)

Figure 7. Surge-Suppression Circuit

_________________Pin Configurations ___________________Chip Topography

TOP VIEW

IN1 1

IN2 2

IN3 3

V- 4

MAX366

DIP/SO

IN1 1

IN2 2

8 V+

7 OUT1

6 OUT2

5 OUT3

IN3 3

IN4 4

IN5 5

IN6 6

IN7 7

IN8 8

V- 9

MAX367

DIP/SO

18 V+

17 OUT1

16 OUT2

15 OUT3

14 OUT4

13 OUT5

12 OUT6

11 OUT7

10 OUT8

IN1

IN2

IN3

V-

0.085"

(2.16mm)

TRANSISTOR COUNT: 21

SUBSTRATE CONNECTED TO V+

V+

OUT1

0.112"

(2.84mm)

OUT2

OUT3

10 ______________________________________________________________________________________

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