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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers]  [Timekeeping, Timers, and Counters] 
MAX7389, MAX7390
Microcontroller Clock Generator with Watchdog


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 296kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX7389/MAX7390 replace ceramic resonators, crystals, and supervisory functions for microcontrollers in 3.3V and 5V applications.

The MAX7389/MAX7390 provide a clock source, reset, and watchdog functions. The watchdog timer is pin programmable and provides watchdog timeout values in the 16ms to 2048ms range. The MAX7389 provides a separate watchdog output that is used as a status indicator or to control safety-critical system elements.

The MAX7390 features a clock-speed select that reduces the output frequency by half. This functionality allows the microcontroller to operate at reduced power and may be used to extend the time available to perform housekeeping tasks, such as writing data to flash during a power failure.

The MAX7389/MAX7390 clock outputs are factory programmed to a frequency in the 1MHz to 16MHz range. Four standard frequencies are available. Other frequencies are available upon request. The maximum operating supply current is 5.5mA with a clock frequency of 12MHz.

Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7389/MAX7390 are resistant to EMI, vibration, and operate reliably at high temperatures. The high-output drive current and absence of high-impedance nodes make the oscillator invulnerable to dirty or humid operating conditions.

The MAX7389/MAX7390 are available in an 8-pin µMAX® package. The MAX7389/MAX7390 standard operating temperature range is from -40°C to +125°C.

Key Features   Applications/Uses
  • Robust Microcontroller Clock and Supervisor in a Single Package
  • Integrated Reset and Watchdog Functions
  • Pin-Programmable Watchdog Timeout
  • Speed Select
  • +2.7V to +5.5V Operation
  • Factory-Trimmed Oscillator
  • Reset Valid Down to 1.1V Supply Voltage
  • ±10mA Clock-Output Drive Current
  • ±4% Total Accuracy for -40°C to +125°C
  • ±2.75% Total Accuracy for -0°C to +85°C
  • 5.5mA Operating Current (12MHz Version)
  • -40°C to +125°C Temperature Range
  • 8-Pin µMAX Surface-Mount Package
  • 1MHz to 16MHz Factory Preset Frequency

 
  		• Appliances and Controls
  		• Automotive
  		• Handheld Products
  		• Microcontroller Systems
  		• Portable Equipment
  		• White Goods

    Diagram
    MAX7389, MAX7390: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  		• Application Note 3582: Replacing Crystals and Ceramic Resonators with Silicon Oscillators - MAX7389, MAX7390

    Design Guides
  		• Microprocessor Supervisory (PDF)
  		• System Timing & Control (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: 1-36 of 36

    MAX7389 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX7389CMAC    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CSAC    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CSVB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CSWB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CMRD-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CMTP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CMVB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CMWB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CSRD    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CSTP    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CSTP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CSVB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CSWB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7389CMRD    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CMTP    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CMVB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CMWB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7389CSRD-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX7390CMAC    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CSAC    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CMRD    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CMRD-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CMTP    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CMTP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CMVB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CMVB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CMWB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CMWB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CSRD    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CSRD-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CSTP    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CSTP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CSVB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CSVB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX7390CSWB    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7390CSWB-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet

    Related Products
    MAX7391 Speed-Switching Clock Generator with Power Fail
    MAX7387, MAX7388 System Monitoring Oscillator with Watchdog and Power Fail
    MAX7389, MAX7390 Microcontroller Clock Generator with Watchdog

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     Description 
     Key Features 
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     Key Specifications 
     Diagram 

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    Document Ref.: 19-3897; Rev 1; 2006-02-14
    This page last modified: 2006-11-28


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