__________Applications Information

Operation with

Supply Voltages Other than 15V

Using supply voltages less than ±15V will reduce the

analog signal range. The MAX338/MAX339 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 affect the

devices’ low switch resistance and low leakage charac-

teristics. Device operation is unchanged, and the differ-

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

8-Channel/Dual 4-Channel,

Low-Leakage, CMOS Analog Multiplexers

6

_______________________________________________________________________________________

______________________________________________________________Pin Description

NO

COM

V-

V+

Figure 1. Overvoltage Protection Using External Blocking

Diodes

PIN

MAX338

MAX339

DIP/SO/QSOP

TQFN-EP

DIP/SO/QSOP

TQFN-EP

NAME

FUNCTION

1, 15, 16,

15, 14, 13

—

—

A0, A2, A1

Address Inputs

—

—

1, 16

15, 14

A0, A1

Address Inputs

2

16

2

16

EN

Enable

3

1

3

1

V-

Negative-Supply Voltage Input

4–7

2–5

—

—

NO1–NO14

Analog Inputs—Bidirectional

—

—

4–7

2–5

NO1A–NO4A

Analog Inputs—Bidirectional

8

6

—

—

COM

Analog Output—Bidirectional

—

—

8, 9

6, 7

COMA, COMB

Analog Outputs—Bidirectional

9–12

7–10

—

—

NO8–NO5

Analog Inputs—Bidirectional

—

—

10–13

8–11

NO4B–NO1B

Analog Inputs—Bidirectional

13

11

14

12

V+

Positive-Supply Voltage Input

14

12

15

13

GND

Ground

—

—

—

—

Exposed Pad

Exposed Pad (TQFN only). Connect EP to

V+.