__________Applications Information

Operation with Supply Voltages

Other than 15V

Using supply voltages less than ±15V will reduce the

analog signal range. The MAX336/MAX337 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. Both device types can

also 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 the

logic inputs NO and COM. If power-supply sequencing

is not possible, 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 above V-, but does not significantly

affect the devices’ low switch resistance and low leak-

age characteristics. Device operation is unchanged,

and the difference between V+ and V- should not

exceed 44V.

16-Channel/Dual 8-Channel,

Low-Leakage, CMOS Analog Multiplexers

6

_______________________________________________________________________________________

______________________________________________________________Pin Description

NO

COM

V-

V+

MAX336

MAX337

Figure 1. Overvoltage Protection Using External Blocking

Diodes

3, 13, 14

PIN

27

27

V-

MAX336

MAX337

NAME

Negative Supply-Voltage Input. Connect to GND for single-supply operation.

FUNCTION

1

28

V+

—

Positive Supply-Voltage Input

2, 3, 13

1

N.C.

COM

No Internal Connection

—

2

COMB

Analog Signal Output* (bidirectional)

Analog Signal B Output* (bidirectional)

N.C.

—

No Internal Connection

28

—

4–11

NO8B–NO1B

COMA

Analog Signal B Inputs* (bidirectional)

12

12

GND

Analog Signal A Output* (bidirectional)

Logic Ground

14–17

—

A3–A0

Logic Address Inputs

—

15, 16, 17

A2, A1, A0

Logic Address Inputs

18

18

EN

Logic Enable Input

19–26

—

NO1–NO8

Analog Signal Inputs* (bidirectional)

—

19–26

NO1A–NO8A

Analog Signal A Inputs* (bidirectional)

* Analog signal inputs and outputs are names of convenience only; they are identical and interchangeable.

4–11

—

NO16-NO9

Analog Signal Inputs* (bidirectional)