LTC1235

PRODUCTION

LTC1235

Microprocessor Supervisory Circuit

PRODUCTION

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1ku List Price Starting From $4.95

Features

Guaranteed Reset Assertion at V_CC = 1V
1.5mA Maximum Supply Current
Fast (35ns Max.) Onboard Gating of RAM Chip Enable Signals
Conditional Battery Backup Extends Battery Life
4.65V Precision Voltage Monitor
Power OK/Reset Time Delay: 200ms
External Reset Control
Minimum External Component Count
1µA Maximum Standby Current
Voltage Monitor for Power Fail or Low Battery Warning
Thermal Limiting
Performance Specified Over Temperature
All the LTC695 Features Plus Conditional Battery Backup and External Reset Control

Additional Details

The LTC1235 provides complete power supply monitoring and battery control functions for microprocessor reset, battery backup, RAM write protection, power failure warning and watchdog timing. The LTC1235 has all the LTC695 features plus conditional battery backup and external reset control. When an out-of-tolerance power supply condition occurs, the reset outputs are forced to active states and the Chip Enable output write-protects external memory. The RESET output is guaranteed to remain logic low with V_CC as low as 1V. External reset control is provided by a debounced push-button reset input.

The LTC1235 powers the active CMOS RAMs with a charge pumped NMOS power switch to achieve low dropout and low supply current. When primary power is lost, auxiliary power, connected to the battery input pin, provides backup power to the RAMs. The LTC1235 can be programmed by a P signal to either back up the RAMs or not. This extends the battery life in situations where RAM data need not always be saved when power goes down.

For an early warning of impending power failure, the LTC1235 provides an internal comparator with a user-defined threshold. An internal watchdog timer is also available, which forces the reset pins to active states when the watchdog input is not toggled prior to the time-out period.

Applications

Critical µP Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 3

1ku List Price Starting From $4.95

Technical Documents 3

LTC1235: Microprocessor Supervisory Circuit Data Sheet 07/07/2008

R163 Reliability Data 03/26/2018

LTC1235 - SPECIFICATION NOTICE 11/05/2004

Reference Materials 1

Voltage Monitors & Supervisors Quick Guide 04/04/2017

Design Resources 3

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC1235CN#PBF	16-Lead PDIP (Narrow 0.30 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1235CSW#PBF	16-Lead SOIC (Wide 0.3 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1235CSW#TRPBF	16-Lead SOIC (Wide 0.3 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1235CN#PBF
Pin/Package Drawing
16-Lead PDIP (Narrow 0.30 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1235CSW#PBF
Pin/Package Drawing
16-Lead SOIC (Wide 0.3 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1235CSW#TRPBF
Pin/Package Drawing
16-Lead SOIC (Wide 0.3 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

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Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LTC1235CN#PBF

PRODUCTION

pdf

PCN22_0241_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LTC1235CN#PBF

PRODUCTION

pdf

PCN22_0172_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Aug 10, 2022

- 22_0176

Laser Top Mark Conversion for SOIC_W Packages Assembled in ADPG [PNG] and UTL

LTC1235CSW#PBF

PRODUCTION

LTC1235CSW#TRPBF

PRODUCTION

pdf

PCN22_0176_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LTC1235CN#PBF

PRODUCTION

pdf

PCN22_0241_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LTC1235CN#PBF

PRODUCTION

pdf

PCN22_0172_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Aug 10, 2022

- 22_0176

Laser Top Mark Conversion for SOIC_W Packages Assembled in ADPG [PNG] and UTL

LTC1235CSW#PBF

PRODUCTION

LTC1235CSW#TRPBF

PRODUCTION

pdf

PCN22_0176_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

LTspice 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.