Analog Devices Inc./Maxim Integrated DS1833-5+T&R

Overview

DS1833-5+T&R from Maxim Integrated (now Analog Devices) is a precision 5V microprocessor supervisory circuit with 5% V_CC trip point, active-high reset output, and 350 ms reset timeout. It monitors power supply integrity, asserts reset during undervoltage or power failure, and holds reset active for stabilization-used in embedded controllers, industrial PLCs, and battery-backed systems.

For engineers reviewing the DS1833-5+T&R datasheet, DS1833-5+T&R pinout, DS1833-5+T&R application, or DS1833-5+T&R equivalent, key selection criteria include V_CC trip accuracy (4.5–4.74 V), guaranteed 350 ms reset pulse width, internal 5 kΩ pull-up, SOT-223 package compatibility, and -40°C to +85°C operation.

Technical Context

The DS1833-5+T&R implements a temperature-compensated voltage reference and comparator to detect V_CC falling below 4.625 V (typical) with ±5% tolerance. Its internal logic ensures RST remains high for 250–450 ms after V_CC recovery, meeting MIL-STD and JEDEC power-on reset timing requirements.

It features no external components required for basic reset generation: integrated 5 kΩ pull-up resistor, low quiescent current (1.5–2 mA), and TTL/CMOS-compatible RST output capable of sinking 8 mA at 0.4 V. The device operates across full industrial temperature range without calibration.

Key Specifications

Pinout & Package

SOT-223 package (4-pin, surface-mount), thermally enhanced with exposed thermal pad; pin 4 is dedicated ground for improved noise immunity and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–T5 and TPS3808G33, the DS1833-5+T&R provides native active-high reset with integrated pull-up and exact 5 V ±5% trip-enabling direct replacement in existing 5 V supervisory circuits without layout or firmware changes.

Availability

DS1833-5+T&R is available at Aetrix Electronics and suitable for industrial automation, smart energy metering, and medical edge-sensing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for DS1833-5+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 (acquired by Analog Devices in 2021) designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets.

The DS1833-5+T&R belongs to Maxim's EconoReset™ supervisory family, engineered for cost-sensitive, high-volume embedded systems needing reliable power-on reset and brownout protection without external components.

FAQ

What is the exact V_CC trip voltage range for DS1833-5+T&R?

The DS1833-5+T&R has a guaranteed V_CC trip point range of 4.5 V to 4.74 V at 25°C, corresponding to its 5% tolerance specification around the nominal 4.625 V threshold. This range is validated across -40°C to +85°C per the datasheet's DC electrical characteristics table. The DS1833-5+T&R maintains this accuracy using an internal temperature-compensated voltage reference.

Does DS1833-5+T&R require an external pull-up resistor on the RST pin?

No, the DS1833-5+T&R integrates a 3.75–6.25 kΩ pull-up resistor internally, enabling direct connection to standard CMOS/TTL reset inputs without external components. This feature is confirmed in the "DC Electrical Characteristics" table under "Internal Pull-Up Resistor" and eliminates BOM items in most implementations of the DS1833-5+T&R.

Is DS1833-5+T&R pin-compatible with DS1233-5 or DS1833-10?

No-while DS1833-5+T&R shares the same SOT-223 pinout (GND–RST–V_CC–GND) with DS1833-10 and DS1833-15, it is not pin-compatible with DS1233-5, which uses TO-92 (3-pin) packaging. DS1833-5+T&R's fourth pin (dedicated GND) provides improved noise immunity and thermal performance not present in 3-pin variants.

What is the reset timeout behavior of DS1833-5+T&R during power-up?

Upon power-up, the DS1833-5+T&R asserts RST high for 250–450 ms (typ. 350 ms) after V_CC crosses the 4.625 V trip threshold. This delay ensures stable power and clock conditions before releasing reset-verified in the "AC Electrical Characteristics" table under "Reset Active Time (t_RST)". The DS1833-5+T&R does not require external timing components to achieve this.

Can DS1833-5+T&R operate reliably at 3.3 V supply?

No-the DS1833-5+T&R is specified for 5 V systems only, with a minimum operating voltage of 1.2 V but a fixed 5% trip point centered at 4.625 V. At 3.3 V, the device remains in permanent reset (RST high) because V_CC never reaches the trip threshold. For 3.3 V supervision, a different part such as MAX6326–T33 is required-not the DS1833-5+T&R.