DS1238A

MicroManager
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Status Explanations for product status codes

All versions are No Longer Available. See Ordering Information for recommended replacements.

Description

The DS1238A MicroManager provides all the necessary functions for power supply monitoring, reset control, and memory backup in microprocessor-based systems. A precise internal voltage reference and comparator circuit monitor power supply status. When an out-of-tolerance condition occurs, the microprocessor reset and power-fail outputs are forced active, and static RAM control unconditionally write protects external memory. The DS1238A also provides early warning detection of a user-defined threshold by driving a non-maskable interrupt.

  

Data Sheet

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Key Features

  • Holds microprocessor in check during power transients
  • Halts and restarts an out-of-control microprocessor
  • Warns microprocessor of an impending power failure
  • Converts CMOS SRAM into nonvolatile memory
  • Unconditionally write protects memory when power supply is out of tolerance
  • Consumes less than 200nA of battery current
  • Controls external power switch for high current applications
  • Debounces pushbutton reset
  • Accurate 10% power supply monitoring
  • Optional 5% power supply monitoring designated DS1238A-5
  • Provides orderly shutdown in microprocessor applications
  • Pin-for-pin compatible with MAX691
  • Standard 16-pin DIP or space-saving 16-pin SOIC
  • Optional industrial temperature range -40°C to +85°C
  • Underwriters Laboratories (UL) Recognized
    
   

Application Notes

Application Note 245   Adding Hysteresis to CPU Supervisor Voltage Sense Inputs Monitoring Upstream Voltage Supplies for Power-Fail Warnings

Reliability Reports

Request Reliability Report for:
Underwriters Laboratories (UL) Recognized

Software/Models

none

Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS1238A-10     N/A No Longer Available DS1238A-10+

 		 PDIP;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238A-10+     N/A No Longer Available   PDIP;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238A-10N     N/A No Longer Available DS1238A-10N+

 		 PDIP;

Land Pattern: Not Available

-40°C to +85°C See data sheet
DS1238A-10N+     N/A No Longer Available   PDIP;

Land Pattern: Not Available

-40°C to +85°C See data sheet
DS1238A-5     N/A No Longer Available DS1238A-5+

 		 PDIP;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238A-5+     N/A No Longer Available   PDIP;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-10     N/A No Longer Available DS1238AS-10+

 		 SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-10+     N/A No Longer Available   SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-10+T&R     N/A No Longer Available   SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-10/T&R     N/A No Longer Available DS1238AS-10+T&R

 		 SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS1238AS-10/T&R/     N/A No Longer Available   SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-5     N/A No Longer Available DS1238AS-5+

 		 SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-5+     N/A No Longer Available   SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-5+T&R     N/A No Longer Available   SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-5/T&R     N/A No Longer Available DS1238AS-5+T&R

 		 SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1238AS-5/T&R/     N/A No Longer Available   SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Products with Similar Part Numbers

DS1238 MicroManager


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Rev 1; 1999-11-18
This page last modified: 2002-03-13

 


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