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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 160kB) Download   E-Mail

Description

The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for a microprocessor: power supply, software execution, and external override. First, a precision temperature-compensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the reset(s) to an active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 140ms to allow the power supply and processor to stabilize. The DS1814/DS1819 ‘A' and ‘C' perform pushbutton reset control. They debounce the pushbutton input and generate an active reset pulse width of 140ms minimum. The DS1814/9 'A' and 'B' versions perform a watchdog function. The watchdog is an internal timer that forces the reset signals to the active state if the strobe input does not change state every 1.12 seconds. The watchdog timer function can be disabled by leaving the watchdog strobe input disconnected.

Key Features

Halts and restarts an out-of-control microprocessor Holds microprocessor in check during power transients Automatically restarts microprocessor after power failure Monitors pushbutton for external override Accurate 5%, 10%, or 20% (3V only) microprocessor power monitoring Eliminates the need for discrete components 20% tolerance for use with 3.0V systems Pin- and function-compatible with the MAX823/24/25 products Low cost SOT-23-5 package Industrial temperature range: -40°C to +85°C

Diagram

Block Diagram

Application Notes

Application Note 164: Using the DS1814 MicroMonitor to Control Microprocessor Resets - DS1814A, DS1814B, DS1814C Application Note 3316: Dallas Semiconductor Microprocessor Supervisor Selection Guide - DS1814A, DS1814B, DS1814C, DS1819A, DS1819B, DS1819C

Design Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Reliability Report: DS1814.pdf DS1819.pdf Request Reliability Report for: DS1814A DS1814B DS1814C DS1819A DS1819B DS1819C

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * 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: 1-29 of 29

DS1814A	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1814AR-5/T&R	5V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1814AR-10/T&R	5V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1814AR-5+T&R	5V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1814B	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1814BR-5/T&R	5V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1814BR-10/T&R	5V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1814BR-10+T&R	5V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1814BR-5+T&R	5V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1814C	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1814CR-5/T&R	5V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1814CR-10/T&R	5V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1814CR-10+T&R	5V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1814CR-5+T&R	5V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819A	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1819AR-5/T&R	3.3V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819AR-10/T&R	3.3V-10% 3k Per Reel			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819AR-20/T&R	3.3V-20%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819AR-10+T&R	3.3V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819AR-20+T&R	3.3V-20%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819AR-5+T&R	3.3V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819B	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1819BR-5/T&R	3.3V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819BR-10/T&R	3.3V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819BR-20/T&R	3.3V-20%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819BR-10+T&R	3.3V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819BR-20+T&R	3.3V-20%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819BR-5+T&R	3.3V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819C	Notes	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1819CR-20+T&R	3.3V-20%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819CR-20/T&R	3.3V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819CR-5/T&R	3.3V-20%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819CR-10/T&R	3.3V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1819CR-10+T&R	3.3V-10%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1819CR-5+T&R	3.3V-5%			Active	SOT;5 pin;9 mm² Outline Drawing: 21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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