Analog Devices Inc./Maxim Integrated DS1233MS-5+T&R

Overview

DS1233MS-5+T&R from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring microprocessor supervisory circuit in 8-pin SOIC package, featuring 4.375 V typical reset threshold, 350 ms reset pulse width, and active-low open-drain RST output. It monitors VCC for out-of-tolerance conditions and ensures reliable power-up sequencing in embedded microcontroller systems.

For engineers reviewing the DS1233MS-5+T&R datasheet, DS1233MS-5+T&R pinout, DS1233MS-5+T&R application, or DS1233MS-5+T&R equivalent, key selection criteria include trip point accuracy (±0.125 V), guaranteed reset assertion during brownout, internal 5 kΩ pullup, -40°C to +85°C operation, and compatibility with Motorola 68XXX/HC16 families.

Technical Context

The DS1233MS-5+T&R implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations against a fixed 4.375 V nominal trip point. Its internal power-fail logic asserts RST low on undervoltage and holds it active for 350 ms after VCC recovery, ensuring processor stabilization before release.

It operates across 1.2 V to 5.5 V supply range with 50 µA quiescent current and supports open-drain reset signaling with internal 5 kΩ pullup. Pin function is compatible with MC33064/MC34064 series, enabling drop-in replacement in legacy designs without layout changes.

Key Specifications

Pinout & Package

DS1233MS-5+T&R is supplied in an 8-pin SOIC (150-mil) surface-mount package with exposed pad not present. Pin 1 = RST (active-low open-drain reset output), Pin 2 = VCC (power supply input), Pins 3 & 5–8 = NC (no-connect), Pin 4 = GND (ground reference).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1233MS-5+T&R, MAX691ACSA+ adds watchdog functionality but raises trip voltage, while TPS3808G33DBVR lowers power consumption and fixes trip at 3.3 V-neither offers pin compatibility, but both serve distinct supervisory roles in voltage-specific or feature-expanded contexts.

Availability

DS1233MS-5+T&R is available at Aetrix Electronics and suitable for industrial control panels, medical instrumentation, automotive body electronics, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for DS1233MS-5+T&R 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, and computing applications.

The DS1233MS-5+T&R belongs to the EconoReset™ family of supervisory circuits engineered for cost-sensitive, high-reliability microprocessor power monitoring in space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for DS1233MS-5+T&R?

The DS1233MS-5+T&R has a guaranteed VCC trip point between 4.25 V and 4.49 V, with a typical value of 4.375 V. This threshold is factory-trimmed and temperature-compensated, ensuring consistent reset activation across the full -40°C to +85°C operating range without external calibration. The DS1233MS-5+T&R datasheet specifies this tolerance under DC electrical characteristics.

Does DS1233MS-5+T&R require an external pullup resistor on the RST pin?

No, DS1233MS-5+T&R integrates a 5 kΩ internal pullup resistor on the RST pin, eliminating the need for an external component in standard open-drain reset configurations. This simplifies design and reduces BOM count. However, if interfacing with high-capacitance buses or non-standard logic families, an external pullup may still be recommended per system-level signal integrity analysis.

Is DS1233MS-5+T&R pin-compatible with MC34064?

Yes, DS1233MS-5+T&R is pin-function compatible with the MC34064, as confirmed in the official datasheet's "Pin function compatible with…" statement. Both devices share identical RST/VCC/GND/NC pin assignments in 8-pin SOIC packages. No PCB layout changes are required when substituting DS1233MS-5+T&R into existing MC34064-based designs.

What is the reset timeout duration of DS1233MS-5+T&R after VCC recovery?

The DS1233MS-5+T&R holds the RST output active for a guaranteed minimum of 200 ms and a typical duration of 350 ms after VCC returns to within tolerance. The maximum timeout is 500 ms. This timing ensures robust stabilization of both the power supply and connected microprocessor before release, preventing erratic startup behavior in DS1233MS-5+T&R-equipped systems.

Can DS1233MS-5+T&R operate from a 3.3 V supply?

Yes, DS1233MS-5+T&R supports supply voltages from 1.2 V to 5.5 V, including 3.3 V operation. However, its 4.375 V nominal trip point means it will assert reset whenever VCC falls below ~4.25 V - so at 3.3 V supply, RST remains continuously active. It is intended for monitoring 5 V rails; for 3.3 V systems, consider DS1233M-3 or TPS3808G33DBVR instead.