__________Applications Information

Operation with Supply Voltages

Other than ±15V

Using supply voltages other than ±15V will reduce the

analog signal range. The MAX306/MAX307 switches

operate with ±4.5V to ±20V bipolar supplies or with a

+4.5V to +30V single supply; connect V- to GND when

operating with a single supply. Also, both device types

can operate with unbalanced supplies such as +24V

and -5V. The

Typical Operating Characteristics graphs

show typical on-resistance with 20V, 15V, 10V, and 5V

supplies. (Switching times increase by a factor of two

or more for operation at 5V.)

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, then V-, followed by either

the logic inputs, NO, or COM. If power-supply

sequencing is not possible, add two small signal

diodes in series with supply pins for overvoltage pro-

tection (Figure 1). Adding diodes reduces the analog

signal range to 1V above V+ and 1V below V-, but low

switch resistance and low leakage characteristics are

unaffected. Device operation is unchanged, and the

difference between V+ and V- should not exceed +44V.

Precision, 16-Channel/Dual 8-Channel,

High-Performance, CMOS Analog Multiplexers

6

_______________________________________________________________________________________

Output–bidirectional

COM

28

Address Inputs

A3–A0

14–17

Enable Inputs

EN

18

Analog Inputs–bidirectional

NO1–NO8

19–26

Negative Supply Voltage Input

V-

27

Ground

GND

12

Analog Inputs–bidirectional

NO16–NO9

4–11

MAX306

PIN

No Internal Connections

N.C.

2, 3, 13

Positive Supply Voltage Input

V+

1

FUNCTION

NAME

Negative Supply Voltage Input

V-

27

Output A–bidirectional

COMA

28

Ground

GND

12

Address Inputs

A2, A1, A0

15, 16, 17

Enable Input

EN

18

Analog Inputs–bidirectional

NO1A–NO8A

19–26

Analog Inputs–bidirectional

NO8B–NO1B

4–11

No Internal Connection

N.C.

3, 13, 14

MAX307

PIN

Output B–bidirectional

COMB

2

Positive Supply Voltage Input

V+

1

FUNCTION

NAME

_____________________________________________________________Pin Descriptions

NO

COM

V-

V+

Figure 1. Overvoltage Protection Using External Blocking

Diodes