___________________Chip Topography

_________________Pin Configurations

V+

IN3

V-

0.112"

(2.84mm)

0.085"

(2.16mm)

OUT1

OUT2

OUT3

IN2

IN1

TRANSISTOR COUNT: 21

SUBSTRATE CONNECTED TO V+

IN4

IN3

IN2

IN1

IN7

IN6

IN5

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

V+

OUT1

OUT2

OUT3

DIP/SO

OUT4

OUT5

OUT6

OUT7

IN8

10

9

OUT8

V-

MAX367

V-

IN3

IN2

IN1

8

7

6

5

1

2

3

4

V+

OUT1

OUT2

OUT3

TOP VIEW

DIP/SO

MAX366

Signal-Line Circuit Protectors

10

______________________________________________________________________________________

__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.

MAX366

OUT1

1

IN1

7

+5V

-5V

SURGE SUPPRESSERS

(+10V)

OUT2

2

IN2

6

OUT3

3

IN3

5

V+

4

V-

8

OP AMP

Figure 7. Surge-Suppression Circuit