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Maxim > Products > [Interface and Interconnect] 
MAX3218
1µA, 1.8V to 4.25V RS-232 Transceiver with AutoShutdown™


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 136kB)
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Description
The MAX3218 RS-232 transceiver is intended for battery-powered EIA/TIA-232E and V.28/V.24 communications interfaces that need two drivers and two receivers with minimum power consumption from a single low-voltage supply. It provides a wide +1.8V to +4.25V operating voltage range while maintaining true RS-232 and EIA/TIA-562 voltage levels. The MAX3218 runs from two alkaline, NiCd, or NiMH cells without any form of voltage regulator. A guaranteed 120kbps data rate provides compatibility with popular software for communicating with personal computers.

Supply current is reduced to 1µA with Maxim's new AutoShutdown feature. When the MAX3218 does not sense a valid signal level on the receiver inputs, the on-board power-supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. The system turns on again when a valid level is applied to either RS-232 receiver input. As a result, the system saves power without changes to the existing software. Additionally, the MAX3218 can be forced into or out of shutdown, under logic control.

While shut down, all receivers can remain active or can be disabled under logic control, permitting a system incorporating the CMOS MAX3218 to monitor external devices while in low-power shutdown. Three-state drivers are provided on both receiver outputs so that multiple receivers, generally of different interface standards, can be on the same bus. The MAX3218 is available in 20-pin DIP and SSOP packages.

Key Features   Applications/Uses
BETTER THAN BIPOLAR!

  • 1µA Supply Current Using AutoShutdown
  • Operates Directly from Two Alkaline, NiCd or NiMH Cells
  • +1.8V to +4.25V Single-Supply Voltage Range
  • 120kbps Data Rate Guaranteed
  • Low-Cost Surface-Mount Components
  • Meets EIA/TIA-232E Specifications
  • Three-State Receiver Outputs
  • Flow-Through Pinout
  • On-Board DC-DC Converters
  • 20-Pin SSOP and DIP Packages

 
  		• Battery-Powered Applications
  		• Cell Phones
  		• Handheld Equipment
  		• PDAs
  		• Peripherals
  		• Subnotebook Computers

  • *Patent Pending

    • Diagram
    MAX3218: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 654: New RS-232 ICs Feature 1µA Supply Current, ±15kV ESD Protection, and 3V Operation - MAX3218
  		• Application Note 836: Selecting and using RS-232 Interface Parts for Your Power Supply Voltages - MAX3218
  		• Application Note 882: RS-232 Features Explained - MAX3218
  		• Application Note 1834: Lower the Supply Current in Your RS-232 System - MAX3218
  		• Application Note 2141: Determining Clock Accuracy Requirements for UART Communications - MAX3218

    Design Guides
  		• Interface (PDF)

    Reliability Reports
  		• Show FIT data for:
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    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: 1-17 of 17

    MAX3218 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX3218C/D    
    		Active DICE SALES;NA pin;0 mm²

    Land Pattern: Not Applicable
    Use pkgcode/variation: DICE*
    		See data sheet
    MAX3218CPP    
    		Active PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3218CPP+  
    		Active PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3218EPP    
    		Active PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3218CWP+  
    		Active SOIC(W);20 pin;138 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3218CWP+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX3218CWP    
    		Active SOIC(W);20 pin;138 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3218CWP-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX3218EWP    
    		Active SOIC(W);20 pin;138 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3218CAP    
    		Active SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3218CAP-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX3218CAP+  
    		Active SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3218CAP+T    
    		Active SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3218EAP    
    		Active SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX3218EAP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX3218EAP+  
    		Active SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX3218EAP+T    
    		Active SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

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    Document Ref.: 19-0380; Rev 0; 1995-03-01
    This page last modified: 2009-11-10


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