Precision, Quad, SPST Analog Switches

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7

__________Applications Information

Overvoltage Protection

Proper power-supply sequencing is recommended for

all CMOS devices. Do not exceed the absolute maxi-

mum ratings, because stresses beyond the listed rat-

ings may cause permanent damage to the devices.

Always sequence V+ on first, followed by V-, and then

logic inputs. If power-supply sequencing is not possi-

ble, add two small signal diodes in series with supply

pins for overvoltage protection (Figure 1). Adding

diodes reduces the analog signal range to 1V below V+

and 1V below V-, but low switch resistance and low

leakage characteristics are unaffected. Device opera-

tion is unchanged, and the difference between V+ and

V- should not exceed 17V.

______________________________________________________________Pin Description

POSITIVE SUPPLY

COM

NEGATIVE SUPPLY

NO

Vg

V+

V-

Figure 1. Overvoltage Protection Using Two External Blocking

Diodes

Positive Supply-Voltage Input—connected to substrate

V+

13

No Connect—not internally connected

N.C.

12

Ground

GND

5

Negative Supply-Voltage Input

V-

4

PIN

Switch Inputs

NO1–NO4

or

NC1–NC4

3, 14, 11, 6

Analog Switch Common Terminal

COM1–COM4

2, 15, 10, 7

Inputs

IN1–IN4

1, 16, 9, 8

FUNCTION

NAME