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Data Sheet

FULL DATA SHEET (PDF, 436kB) Download   E-Mail

Description

The DS1236A MicroManager Chip 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 DS1236A also provides early warning detection of a user-defined threshold by driving a non-maskable interrupt. External reset control is provided by a pushbutton reset input which is debounced and activates reset outputs. An internal watchdog timer can also force the reset outputs to the active state if the strobe input is not driven low prior to watchdog timeout. Reset control and wake-up/sleep control inputs also provide the necessary signals for orderly shutdown and start-up in battery backup and battery operated applications.

Key Features

Holds microprocessor in check during power transients Halts and restarts an out-of-control microprocessor Monitors pushbutton for external override 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 100 nA of battery current at 25°C Controls external power switch for high current applications Accurate 10% power supply monitoring Optional 5% power supply monitoring designated DS1236A-5 Provides orderly shutdown in nonvolatile microprocessor applications Supplies necessary control for low-power "stop mode" in battery operated hand-held applications Standard 16-pin DIP or space-saving 16-pin SOIC Optional industrial temperature range -40°C to +85°C Freshness Seal on Battery Attachment 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 - DS1236A

Design Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Request Reliability Report for: DS1236A Underwriters Laboratories (UL®) Recognized

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: 1-22 of 22

DS1236A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1236A-10		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236A-10+		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236A-5		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236A-5+		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236A-10N		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236A-10N+		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236A-5N		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236A-5N+		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236AS-10		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-10+		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-10+T&R		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-10/T&R		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-5		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-5+		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-5+T&R		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-5/T&R		N/A	No Longer Available	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1236AS-10N		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236AS-10N+		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236AS-10N+T&R		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236AS-10N/T&R		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236AS-5N		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1236AS-5N+		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet

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