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Maxim > Products > [Analog Switches and Multiplexers] 
MAX4820, MAX4821
+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface

8-Channel, +3V/+5V, Cascadable Relay Drivers with Serial/Parallel Interface


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 180kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX4820/MAX4821 8-channel relay drivers offer built-in kickback protection and drive +3.3V/+5V nonlatching or dual-coil-latching relays. These devices are especially useful when driving +3V relays. Each independent open-drain output features a 2Ω on-resistance and is guaranteed to sink 70mA (min) of load current. Both devices consume less than 50µA (max) quiescent current and have 1µA output off-leakage current.

The MAX4820 features an SPI™-/QSPI™-/MICROWIRE™-compatible serial interface. Input data is shifted into an 8-bit shift register and latched to the outputs when CS-bar transitions from low to high. Each data bit in the shift register corresponds to a specific output, allowing independent control of all outputs.

The MAX4821 features a 4-bit (A0, A1, A2, LVL) parallel-input interface. The first three bits (A0, A1, A2) determine the output address, and the fourth bit (LVL) determines whether the selected output is switched on or off. Data is latched to the outputs when CS-bar transitions from low to high.

Both devices feature separate set and reset functions that allow the user to turn on or turn off all outputs simultaneously with a single control line. Built-in hysteresis (Schmidt trigger) on all digital inputs allows these devices to be used with slow rising and falling signals, such as those from optocouplers or RC power-up initialization circuits. The MAX4820/MAX4821 are available in 20-pin TSSOP and space-saving 20-pin thin QFN packages.

Key Features   Applications/Uses
  • 8 Independent Output Channels
  • Built-In Inductive Kickback Protection
  • Drive +3V and +5V Relays
  • Guaranteed 70mA (min) Coil Drive Current
  • SET-bar Function to Turn On All Outputs Simultaneously
  • RESET-bar Function to Turn Off All Outputs Simultaneously
  • SPI-/QSPI-/MICROWIRE-Compatible Serial Interface (MAX4820)
  • Serial Digital Output for Daisy Chaining (MAX4820)
  • Parallel Interface (MAX4821)
  • Low 50µA (max) Quiescent Supply Current
  • Space-Saving 20-Pin Thin QFN Package

 
  		• Automated Test Equipment (ATE)
  		• Central Office
  		• DSL, ADSL Line Cards
  		• E1/T1 Redundancy
  		• Industrial Equipment

    Key Specifications:  Relay Drivers
    Part Number ISOURCE @2.7V
    (mA)    		 RON @2.7V
    (Ω)    		 IQ
    (µA)    		 Features Channels Interface VSUPPLY
    (V)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    guar. min max max max w/pins See Notes
    MAX4820  70 6 50
    Daisy-Chainable
    Integrated Kickback Diodes
    Power On Reset
    Thermal Shutdown
    		 8 SPI 2.3 to 5.5
    TQFN/20
    TSSOP-EP/20
    		 17 $1.45 @1k
    MAX4821 
    Integrated Kickback Diodes
    Power On Reset
    Thermal Shutdown
    		 Parallel
    TQFN/20
    TSSOP-EP/20
    		 $1.45 @1k
    See All Relay Drivers (7)

    Diagram
    MAX4820, MAX4821: Typical Application Circuits
    Typical Application Circuits

    Application Notes
  		• Application Note 3288: IC Drives Up to Four Single-Coil Latching Relays - MAX4820, MAX4821

    Design Guides
  		• Signal Routing & Protection (PDF)

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

    Software/Models
  		• MAX4820 IBIS Model
  		• MAX4821 IBIS Model

    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: 1-16 of 16

    MAX4820 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4820ETP  
    		Active TQFN;20 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0037 (PDF)
    Use pkgcode/variation: T2044-3*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4820ETP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX4820ETP+  
    		Active TQFN;20 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0037 (PDF)
    Use pkgcode/variation: T2044+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4820ETP+T    
    		Active TQFN;20 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0037 (PDF)
    Use pkgcode/variation: T2044+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4820EUP    
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0114 (PDF)
    Use pkgcode/variation: U20E-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4820EUP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX4820EUP+  
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0114 (PDF)
    Use pkgcode/variation: U20E+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4820EUP+T    
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0114 (PDF)
    Use pkgcode/variation: U20E+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4821 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX4821ETP  
    		Active TQFN;20 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0037 (PDF)
    Use pkgcode/variation: T2044-3*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4821ETP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX4821ETP+  
    		Active TQFN;20 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0037 (PDF)
    Use pkgcode/variation: T2044+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4821ETP+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX4821EUP  
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0114 (PDF)
    Use pkgcode/variation: U20E-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4821EUP-T    
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0114 (PDF)
    Use pkgcode/variation: U20E-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX4821EUP+  
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0114 (PDF)
    Use pkgcode/variation: U20E+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX4821EUP+T    
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0114 (PDF)
    Use pkgcode/variation: U20E+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2004-04-06 

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    Document Ref.: 19-2751; Rev 1; 2009-07-20
    This page last modified: 2009-07-20


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