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MAX3471
1.6µA, RS-485/RS-422, Half Duplex, Differential Transceiver for Battery-Powered Systems


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 87kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX3471 half-duplex transceiver is intended for lithium battery-powered RS-485/RS-422 applications. It draws only 1.6µA (typical) supply current from a 3.6V supply with the receiver enabled and the driver disabled. Its wide 2.5V to 5.5V supply voltage guarantees operation over the lifetime of a lithium battery.

This device features true fail-safe operation that guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). The MAX3471 has a 1/8-unit load input resistance. When driver outputs are enabled and pulled above VCC or below GND, internal circuitry prevents battery back-charging.

The MAX3471 is available in an 8-pin µMAX package.

Key Features   Applications/Uses
  • 1.6µA Supply Current with Receiver Enabled
  • +2.5V to +5.5V Single-Supply Operation
  • True Fail-Safe Receiver Input
  • Available in µMAX Package
  • 1/8-Unit-Load Receiver Input
  • -7V to +10V Common-Mode Input Voltage Range

 
  		• Battery-Powered Differential Communications
  		• Level Translators
  		• Remote Meter Reading

    Key Specifications:  RS-422/485 Line Driver/Receivers
    Part Number Tx/Rx Duplex VSUPPLY
    (V)    		 ICC
    (mA)    		 Data Rate
    (kbps)    		 Tx EN Rx EN Rx/Tx on Bus Package/Pins Price
    typ min See Notes
    MAX3471  1Tx + 1Rx Half 2.5 to 5.5 0.0016 64 Yes Yes 256
    µMAX/8
    		 $1.69 @1k
    See All RS-422/485 Line Driver/Receivers (159)

    Diagram
    MAX3471: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  		• Application Note 367: Explanation of Maxim RS-485 Features - MAX3471
  		• Application Note 1090: Methods for Trimming the Power Required in RS-485 Systems - MAX3471
  		• Application Note 3180: Standby Current for RS-422 Repeater Is Less Than 3µA - MAX3471

    Design Guides
  		• Interface (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-8 of 8

    MAX3471 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX3471CUA    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3471CUA-T    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3471CUA+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3471CUA+T    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3471EUA    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3471EUA-T    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3471EUA+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3471EUA+T    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Notes and Comments
    • Ultra-Low-Power, Fail-Safe, Half-Duplex

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    Document Ref.: 19-0497; Rev 0; 1998-02-01
    This page last modified: 2007-06-01


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