General Description

The MAX349/MAX350 are 8-channel and dual 4-channel

serially controlled multiplexers (muxes). These muxes

conduct equally well in either direction. On-resistance

(100

Ω max) is matched between switches to 16Ω max

and is flat (10

Ω max) over the specified signal range.

These CMOS devices can operate continuously with

dual power supplies ranging from ±2.7V to ±8V or a sin-

gle supply between +2.7V and +16V. Each mux can

handle rail-to-rail analog signals. The off-leakage current

is only 0.1nA at +25°C or 5nA at +85°C.

Upon power-up, all switches are off and the internal

shift registers are reset to zero.

The serial interface is compatible with SPI™/QSPI™

and MICROWIRE™. Functioning as a shift register, it

allows data (at DIN) to be clocked in synchronously

with the rising edge of clock (SCLK). The shift register’s

output (DOUT) enables several MAX349s or MAX350s

to be daisy chained.

All digital inputs have 0.8V or 2.4V logic thresholds,

ensuring both TTL and CMOS-logic compatibility when

using ±5V supplies or a single +5V supply.

________________________Applications

Serial Data-Acquisition

Industrial and Process-

Systems

Control Systems

Avionics

ATE Equipment

Audio Signal Routing

Networking

____________________________Features

o SPI/QSPI, MICROWIRE-Compatible Serial

Interface

o 8 Separately Controlled SPST Switches

o Single 8-to-1 Mux (MAX349)

Dual 4-to-1 Mux (MAX350)

o 100

Ω Signal Paths with ±5V Supplies

o Asynchronous RESET Input

o ±2.7V to ±8V Dual Supplies

+2.7V to +16V Single Supply

o >2kV ESD Protection per Method 3015.7

o TTL/CMOS-Compatible Inputs (with +5V or ±5V

Supplies)

Serially Controlled, Low-Voltage,

8-Channel/Dual 4-Channel Multiplexers

________________________________________________________________

Maxim Integrated Products

1

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

CS

RESET

DOUT

V-

GND

DIN

V+

SCLK

TOP VIEW

N.C.

NO7

NO6

NO5

NO2

NO1

NO0

COM

10

9

NO4

NO3

DIP/SO

MAX349

LOGIC

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

CS

RESET

DOUT

V-

GND

DIN

V+

SCLK

COMB

NO0B

NO1B

NO2B

NO2A

NO1A

NO0A

COMA

10

9

NO3B

NO3A

DIP/SO

MAX350

LOGIC

N.C. = NOT INTERNALLY

CONNECTED

Pin Configurations/Functional Diagrams

19-0451; Rev 1; 10/98

PART

MAX349CPN

MAX349CWN

MAX349CAP

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

18 Plastic DIP

18 Wide SO

20 SSOP

Ordering Information

Ordering Information continued at end of data sheet.

*Contact factory for dice specifications.

MAX349C/D

0°C to +70°C

Dice*

Pin Configurations continued at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.