Datasheet

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General Description

The MAX328/MA329 are monolithic CMOS analog multi-

plexers. The MAX328 is a single-ended, 1-of-8 device,

and the MAX329 is a differential, 2-of-8 device.

Designed to provide the lowest possible on- and off-

leakages, these multiplexers switch signals from high

source impedance, providing the mux operates into a

high-input-impedance op amp or A/D converter. The

MAX328/MAX329 are pin-for-pin replacements for the

popular DG508/DG509 in these applications.

Adding an external 40kΩ resistor to each input makes

the MAX328/MAX329 an excellent fault-tolerant multi-

plexer. Low leakage (less than 1pA at +25°C) and

2.5kΩ on-resistance allow the circuit to sustain 110V

AC faults indefinitely while maintaining an error of less

than 40nV for normal signals (i.e., 1pA times 40kΩ).

The MAX328/MAX329 work equally well with a single

supply of 10V to 30V or dual supplies of ±5V to ±18V.

They also perform well with unbalanced combinations of

supply voltage, such as +12V and -5V or +5V and -15V.

Low power dissipation (1.9mW with ±15V supplies)

allows use in portable applications.

Applications

Control Systems

Data Logging Systems

Aircraft Heads-Up Displays

Data-Acquisition Systems

Signal Routing

Features

o Ultra-Low Off- and On-Leakage: 1pA Typ

o Bidirectional Operation (Use as Mux or Demux)

o TTL and CMOS Logic Compatibility

o Analog-Signal Range Includes Power-Supply Rails

o Switching Speeds Less Than 1.5µs

o Pin Compatible with DG508/DG509 and

MAX358/MAX359

o Latchup Proof Construction

MAX328/MAX329

Ultra-Low Leakage Monolithic CMOS

Analog Multiplexers

________________________________________________________________

Maxim Integrated Products

GND

V+

TOP VIEW

MAX328

DIP/SO

V-

GND

V+

S1B

S2B

S3B

S4B

MAX329

DIP/SO

V-

S3A

S1A

S2A

S4A

Pin Configurations

Ordering Information

MAX328

V+ V-GND

A0 A1 A2 EN

AMP

+15V -15V

40kΩ

1/2W

40kΩ

1/2W

ANALOG

INPUT

ANALOG

INPUT

DM7493

+15V

N.C.

CLK IN

N.C.

GNDV

AIN

BIN

V+

EN IN

(MUX ON/OFF CONTROL)

OUT

i BIAS < 1pA

1-OF-8 CHANNEL SEQUENTIAL MUX WITH 120V AC FAULT CAPABILITY

Typical Operating Circuit

19-1006; Rev 3; 2/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Denotes a lead(Pb)-free/RoHS-compliant package.

Contact factory for dice specifications.

EP = Exposed pad.

***

Contact factory for availability. Substrate may be allowed to

be unconnected or be connected to V+.

Ordering Information continued at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX328CPE+ 0°C to +70°C 16 Plastic DIP

MAX328CWE+ 0°C to +70°C 16 Wide SO

MAX328CJE 0°C to +70°C 16 CERDIP

MAX328C/D 0°C to +70°C Dice*

MAX328ETE+ -40°C to +85°C 16 TQFN-EP**

MAX328EPE+ -40°C to +85°C 16 Plastic DIP

MAX328EWE+ -40°C to +85°C 16 Wide SO

MAX328EJE -40°C to +85°C 16 CERDIP***

MAX328MJE -55°C to +125°C 16 CERDIP***

Pin Configurations continued at end of data sheet.

Summary of content (10 pages)

PAGE 1
9-1006; Rev 3; 2/11 Ultra-Low Leakage Monolithic CMOS Analog Multiplexers The MAX328/MA329 are monolithic CMOS analog multiplexers. The MAX328 is a single-ended, 1-of-8 device, and the MAX329 is a differential, 2-of-8 device. Designed to provide the lowest possible on- and offleakages, these multiplexers switch signals from high source impedance, providing the mux operates into a high-input-impedance op amp or A/D converter.
PAGE 2
MAX328/MAX329 Ultra-Low Leakage Monolithic CMOS Analog Multiplexers ABSOLUTE MAXIMUM RATINGS Voltage Referenced to VV+ ........................................................................................+44V GND .....................................................................................+25V Digital Inputs (Note 1), VS, VD ............................-2V to (V+ + 2V) Current (Any Terminal, Except S or D)................................
PAGE 3
Ultra-Low Leakage Monolithic CMOS Analog Multiplexers (V+ = 15V, V- = -15V, VGND = 0V, TA = +25°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL MAX328M MAX329M CONDITIONS MIN MAX328C/E MAX329C/E TYP MAX VA = 2.4V 0.001 VA = 15V 0.001 MIN UNITS TYP MAX ±1 0.001 ±1 ±1 0.001 ±1 INPUT Address Input Current, Input Voltage High IAH Address Input Current, Input Voltage Low IAL VEN = 2.4V VEN = 0V All VA = 0V 0.001 ±1 0.001 ±1 0.001 ±1 0.
PAGE 4
MAX328/MAX329 Ultra-Low Leakage Monolithic CMOS Analog Multiplexers ELECTRICAL CHARACTERISTICS (Overtemperature) (V+ = 15V, V- = -15V, VGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
PAGE 5
Ultra-Low Leakage Monolithic CMOS Analog Multiplexers RDS(ON) vs. ANALOG INPUT FOR DUAL SUPPLIES ±5V SUPPLIES 6 WITH +15V SUPPLY 4 RDS(ON) (kΩ) RDS(ON) (kΩ) 7 5 5 4 MAX328/MAX329 toc02 8 MAX328/MAX329 toc01 9 RDS(ON) vs. ANALOG INPUT FOR SINGLE SUPPLY 3 2 3 2 1 1 ±15V SUPPLIES 0 0 -5 0 5 10 0 15 5 15 10 ANALOG INPUT (V) IS(OFF) vs. TEMPERATURE ID(ON), ID(OFF) vs. TEMPERATURE V+ = 15V V- = 15V 1.0 100 0.1 0.
PAGE 6
Ultra-Low Leakage Monolithic CMOS Analog Multiplexers MAX328/MAX329 Pin Description PIN MAX328 NAME MAX329 DIP/SO TQFN-EP TQFN-EP 1, 15, 16 15, 14, 13 — — A0, A2, A1 Address Input — — 1, 16 15, 14 A0, A1 Address Input 2 16 2 16 EN Enable Negative-Supply Voltage Input 3 1 3 1 V- 4–7 2–5 — — S1–S4 Analog Inputs—Bidirectional — — 4–7 2–5 S1A–S4A Analog Inputs—Bidirectional 8 6 — — D Analog Outputs—Bidirectional — — 8, 9 6, 7 DA, DB Analog Outputs—Bidirectiona
PAGE 7
Ultra-Low Leakage Monolithic CMOS Analog Multiplexers MAX328/MAX329 VAH = 3.0V A2 50% MAX328 ADDRESS DRIVE (VA) 0V VA A1 50Ω +10V ±10V S1 S2 S2–S7 OUTPUT A A0 S8 EN OUT +VAH GND ± 10V 10MΩ PROBE 14pF 90% -10V tA Figure 1. Access Time vs. Logic Level (High) VAH = 3.0V A2 ADDRESS DRIVE (VA) 0V VA S2–S7 A1 A0 50Ω OUTPUT EN 2.4V 50% +5V S1 MAX328 S8 GND VOUT OUT 50% 1kΩ 12.5pF tOPEN Figure 2. Break-Before-Make Delay (tOPEN) VAH = 3.
PAGE 8
Applications Information Figure 4 is a typical circuit for converting the MAX328/MAX329 into a fault-tolerant mux. In this application, the internal diodes limit the voltage at the MAX328 input to ±15.7V (±15V supplies). No external diodes need to be added with the MAX328/MAX329, unlike conventional multiplexers requiring external diodes. The resistors, R, need to be 39kΩ or higher to limit the power dissipation in the resistor when a 120V AC fault occurs (i.e., power dissipation is (120-16) 2/39kΩ or 0.
PAGE 9
Ultra-Low Leakage Monolithic CMOS Analog Multiplexers A1 14 S4 8 S4B 7 DB TQFN TOP VIEW Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 10
MAX328/MAX329 Ultra-Low Leakage Monolithic CMOS Analog Multiplexers Revision History REVISION NUMBER REVISION DATE 3 2/11 DESCRIPTION Updated the Ordering Information table to reflect lead-free parts and corrected part numbers and package types PAGES CHANGED 1, 9 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.