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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

(100Ω max) is matched between switches to 16Ω max

and is flat (10Ω 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

♦ SPI/QSPI, MICROWIRE-Compatible Serial

Interface

♦ 8 Separately Controlled SPST Switches

♦ Single 8-to-1 Mux (MAX349)

Dual 4-to-1 Mux (MAX350)

♦ 100Ω Signal Paths with ±5V Supplies

♦ Rail-to-Rail

Signal Handling

♦ Asynchronous RESET Input

♦ ±2.7V to ±8V Dual Supplies

+2.7V to +16V Single Supply

♦ >2kV ESD Protection per Method 3015.7

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

Supplies)

MAX349/MAX350

Serially Controlled, Low-Voltage,

8-Channel/Dual 4-Channel Multiplexers

________________________________________________________________

Maxim Integrated Products

RESET

DOUT

V-

GND

DIN

V+

SCLK

TOP VIEW

N.C.

NO7

NO6

NO5

NO2

NO1

NO0

COM

NO4

NO3

DIP/SO

MAX349

LOGIC

RESET

DOUT

V-

GND

DIN

V+

SCLK

COMB

NO0B

NO1B

NO2B

NO2A

NO1A

NO0A

COMA

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

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.

Summary of content (20 pages)

PAGE 1
9-0451; Rev 1; 10/98 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers The MAX349/MAX350 are 8-channel and dual 4-channel serially controlled multiplexers (muxes). These muxes conduct equally well in either direction. On-resistance (100Ω max) is matched between switches to 16Ω max and is flat (10Ω max) over the specified signal range. These CMOS devices can operate continuously with dual power supplies ranging from ±2.7V to ±8V or a single supply between +2.7V and +16V.
PAGE 2
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers ABSOLUTE MAXIMUM RATINGS Voltages Referenced to GND V+ ...........................................................................-0.3V, +17V V- ............................................................................-17V, +0.3V V+ to V-...................................................................-0.3V, +17V SCLK, CS, DIN, DOUT, RESET .................-0.3V to (V+ + 0.3V) NO, COM ................................
PAGE 3
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers (V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER COM On-Leakage Current (Note 3) SYMBOL ICOM(ON) MIN CONDITIONS V+ = 5.5V, V- = -5.5V, VCOM = VNO = ±4.5V MAX349 MAX350 TA = +25°C C, E M TA = +25°C C, E M -0.2 -10 -100 -0.2 -5 -50 TYP (Note 1) 0.001 0.02 MAX 0.2 10 100 0.
PAGE 4
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers TIMING CHARACTERISTICS—Dual Supplies (Figure 1) (V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers (V+ = +4.5V to +5.5V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL MIN CONDITIONS TYP (Note 1) MAX V+ V 125 175 Ω UNITS ANALOG SWITCH Analog Signal Range COM-NO On-Resistance VCOM, VNO RON C, E, M V+ = 5V, VCOM = 3.5V, INO = 1mA V+ = 5.5V, VCOM = 4.5V, VNO = 0V NO Off-Leakage Current (Notes 4, 5) INO(OFF) V+ = 5.5V, VCOM = 0V, VNO = 4.5V MAX349 V+ = 5.
PAGE 6
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued) (V+ = +4.5V to +5.5V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers (V+ = +4.5V to +5.5V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 8
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers ELECTRICAL CHARACTERISTICS—Single +3V Supply (V+ = +3.0V to +3.6V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL MIN CONDITIONS TYP (Note 1) MAX UNITS ANALOG SWITCH Analog Signal Range COM-NO On-Resistance VCOM, VNO RON C, E, M V+ = 3.0V, VCOM = 1.5V, INO = 1mA MAX349 V+ = 3.
PAGE 9
ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued) (V+ = +3.0V to +3.6V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 10
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers TIMING CHARACTERISTICS—Single +3V Supply (Figure 1) (V+ = +3.0V to +3.6V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SERIAL DIGITAL INTERFACE SCLK Frequency Cycle Time (Note 4) SYMBOL MIN CONDITIONS fSCLK C, E, M 0 TYP (Note 1) MAX 2.
PAGE 11
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) 100 60 V± = ±5V 40 90 300 80 TA = +125°C 250 70 TA = +85°C 60 TA = +25°C -3 -2 -1 1 0 2 3 4 TA = -55°C -5 -4 -3 -2 ON-RESISTANCE vs.
PAGE 12
Typical Operating Characteristics (continued) (V+ = +5V, V- = -5V, GND = 0V, TA = +25°C, unless otherwise noted.) POWER-SUPPLY CURRENT vs. TEMPERATURE 90 80 V± = ±5.5V 10 35 MAX349/350-TOC11 100 MAX349/350-TOC10 100 MINIMUM SCLK PULSE WIDTH vs. POSITIVE SUPPLY VOLTAGE I+ MAX349/350-TOC12 DATA SETUP TIME vs. POSITIVE SUPPLY VOLTAGE 30 70 50 1 40 SCLK (ns) 60 I+, I-, (µA) DATA SETUP TIME (ns) 0.1 25 20 30 I- 0.01 20 15 10 0 0.
PAGE 13
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers PIN MAX349 DIP/SO SSOP 1 1 2 2 3 3 MAX350 DIP/SO SSOP 1 1 2 2 3 3 NAME FUNCTION SCLK V+ DIN Serial Clock Digital Input Positive Analog Supply Voltage Input Serial Data Digital Input Ground. Connect to digital ground. (Analog signals have no ground reference; they are limited to V+ and V-.
PAGE 14
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers Detailed Description Basic Operation The MAX349/MAX350 are 8-channel and dual 4-channel, serially controlled multiplexers (muxes). These muxes are unusual in that any, all, or none of the input channels can be directed to the output. All switches are bidirectional, so inputs and outputs are interchangeable.
PAGE 15
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers DATA BITS RESET 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D7 D6 D5 D4 D3 D2 D1 D0 X 0 1 0 1 X X X X X X X X X X X X X X X 0 1 X X 0 1 X X X X X X X X X X X X X 0 1 X X X X 0 1 X X X X X X X X X X X 0 1 X X X X X X 0 1 X X X X X X X X X 0 1 X X X X X X X X 0 1 X X X X X X X 0 1 X X X X X X X X X X 0 1 X X X X X 0 1 X X X X X X X X X X X X 0 1 X X X 0 1 X X X X X X X X X X X X X X 0 1 MAX349 FUNCTION All switches open, D7–D0
PAGE 16
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers Dual, Differential 4-Channel Multiplexer The MAX350 can be programmed normally, with only one differential channel selected for every eight clock pulses, or it can be programmed in a fast mode, where channel changing occurs on each clock pulse.
PAGE 17
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350 DIN SCLK CS1 CS2 TO OTHER SERIAL DEVICES CS3 CS CS CS MAX349 MAX349 MAX349 SCLK MAX350 SCLK MAX350 SCLK MAX350 DIN DIN DIN Figure 6. Addressable Serial Interface D4 D0 SCLK SW4 SW0 DIN FOUR CLOCK PULSES Figure 7. Differential Multiplexer Input Control Power-Supply Considerations Overview The MAX349/MAX350 construction is typical of most CMOS analog switches. It has three supply pins: V+, Vand GND.
PAGE 18
MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers Bipolar Supplies The MAX349/MAX350 operate with bipolar supplies from ±3.0V and ±8V. The V+ and V- supplies need not be symmetrical, but their sum cannot exceed the absolute maximum rating of 17V. Do not connect the MAX349/MAX350 V+ to +3V and connect the logiclevel pins to TTL logic-level signals. This exceeds the absolute maximum ratings and can damage the part and/or external circuits.
PAGE 19
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers PART TEMP.
PAGE 20
SSOP.EPS ________________________________________________________Package Information SOICW.EPS MAX349/MAX350 Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.