Analog Devices Inc./Maxim Integrated DS1233MS-3+TR

Overview

DS1233MS-3+TR from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring microprocessor supervisory circuit in 8-pin SOIC package, featuring 2.72 V nominal reset threshold, 350 ms reset pulse width, and active-low open-drain RST output. It monitors VCC for out-of-tolerance conditions and holds reset during power-up and brownout events in embedded control systems.

For engineers reviewing the DS1233MS-3+TR datasheet, DS1233MS-3+TR pinout, DS1233MS-3+TR application, or DS1233MS-3+TR equivalent, key selection factors include trip point accuracy (±0.08 V), guaranteed 350 ms reset timeout, internal 5 kΩ pullup, compatibility with HC16/68XXX microprocessors, and -40°C to +85°C industrial temperature operation.

Technical Context

The DS1233MS-3+TR implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations against a fixed 2.72 V trip point. Its internal logic asserts active-low RST within 10 µs of undervoltage detection and sustains it for 200–500 ms after VCC recovery.

It operates across 1.2 V to 5.5 V supply range with only 50 µA quiescent current, supports open-drain reset signaling with 8 mA sink capability at 0.4 V, and integrates an internal 5 kΩ pullup resistor-eliminating external components required by discrete reset solutions.

Key Specifications

Pinout & Package

DS1233MS-3+TR is supplied in an 8-pin SOIC package (150 mil width), with pins 1–4 and 5–8 arranged in dual rows. Pin 1 is RST (active-low open-drain reset output), Pin 2 is VCC (power supply input), Pins 3 and 4 are NC (no-connect), Pin 5 is GND (ground reference), and Pins 6–8 are NC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with TPS3808G33DBVR and MAX6326LT31D3+T, the DS1233MS-3+TR offers a balanced combination of 2.72 V trip accuracy, guaranteed 350 ms reset hold, integrated 5 kΩ pullup, and industrial temperature support-making it optimal for cost-sensitive, reliability-critical embedded systems requiring robust power-fail response without layout changes.

Availability

DS1233MS-3+TR is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive infotainment head units, smart energy meters, and embedded instrumentation requiring stable component supply and long-term lifecycle assurance.

Supply support for DS1233MS-3+TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing applications.

The DS1233MS-3+TR belongs to the EconoReset™ family of microprocessor supervisory circuits, engineered to replace discrete reset solutions with single-chip voltage monitoring, reset timing, and interface compatibility for legacy 68XXX and HC16 microcontrollers.

FAQ

What is the exact reset threshold voltage for DS1233MS-3+TR?

The DS1233MS-3+TR has a nominal VCC trip point of 2.72 V, with a guaranteed range of 2.64 V to 2.80 V across -40°C to +85°C. This threshold is factory-trimmed and temperature-compensated, ensuring consistent reset assertion during undervoltage events without external calibration. The DS1233MS-3+TR datasheet specifies this value under DC Electrical Characteristics with Note 1.

Does DS1233MS-3+TR require an external pullup resistor on the RST pin?

No, DS1233MS-3+TR includes an internal 5 kΩ pullup resistor on the RST pin, eliminating the need for an external component in standard 3.3 V or 5 V reset circuits. However, if driving high-capacitance loads (>100 pF) or interfacing with legacy processors requiring stronger pullup, an external resistor may still be added-though not required for basic functionality of the DS1233MS-3+TR.

What is the guaranteed reset pulse width of DS1233MS-3+TR after power recovery?

The DS1233MS-3+TR guarantees a reset pulse width of 200 ms minimum and 500 ms maximum, with 350 ms typical, measured from VCC return to in-tolerance condition until RST deassertion. This timing ensures adequate stabilization of both the power supply and connected microprocessor before release, as confirmed in the AC Electrical Characteristics table of the DS1233MS-3+TR datasheet.

Is DS1233MS-3+TR compatible with Motorola 68XXX-series microprocessors?

Yes, DS1233MS-3+TR is explicitly designed for pin-function compatibility with Motorola 68XXX-series and HC16 microprocessors. Its active-low open-drain RST output, timing profile, and voltage thresholds align with the reset requirements of these legacy architectures, enabling direct integration into existing 68000-based control systems without redesign-verified in the DS1233MS-3+TR product description and features list.

What package type and pin count does DS1233MS-3+TR use?

DS1233MS-3+TR uses an 8-pin SOIC package (150 mil width) with pin 1 = RST, pin 2 = VCC, pins 3–4 = NC, pin 5 = GND, and pins 6–8 = NC. This matches the mechanical drawing referenced in the DS1233MS-3+TR datasheet and distinguishes it from the TO-92 variant (DS1233M-3+). No soldering or footprint adaptation is needed when substituting within the SOIC family.