Analog Devices Inc./Maxim Integrated DS1833-10+T&R

Overview

DS1833-10+T&R from Maxim Integrated (now Analog Devices) is a precision 5V microprocessor supervisory circuit with 10% V_CC trip point (4.25–4.49 V), active-high reset output, and guaranteed 350 ms reset pulse width after power recovery. It integrates a temperature-compensated voltage reference, comparator, and internal 5 kΩ pull-up resistor in SOT-223 package. Used for reliable power-on reset and brownout detection in embedded controllers.

For engineers reviewing the DS1833-10+T&R datasheet, DS1833-10+T&R pinout, DS1833-10+T&R application, or DS1833-10+T&R equivalent, key selection criteria include V_CC trip accuracy (±10%), reset assertion timing (t_RST = 250–450 ms), operating current (1.5–2 mA), thermal range (–40°C to +85°C), and SOT-223 package compatibility with board-level power integrity requirements.

Technical Context

The DS1833-10+T&R implements a dedicated analog monitoring path: a precision bandgap reference feeds a comparator that continuously compares V_CC against a fixed 10% under-voltage threshold. Upon detection of V_CC falling below 4.25 V, RST asserts high within 100 ns (t_RPD). After V_CC recovers above 4.49 V, the device holds RST active for 250–450 ms (t_RST) using an internal timer circuit independent of external components.

No external capacitor or resistor is required for reset timing-the DS1833-10+T&R achieves deterministic reset duration via on-chip RC elements calibrated over temperature. Its internal 5 kΩ pull-up eliminates need for discrete biasing, and the 4-pin SOT-223 layout supports ground plane coupling for noise immunity in noisy power environments.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–MAX6328 and TPS3808G12DBVR, the DS1833-10+T&R delivers fixed 10% 5V trip accuracy, integrated pull-up, and guaranteed 350 ms reset hold in a thermally enhanced SOT-223 package-making it optimal for cost-sensitive, industrial-grade 5V microcontroller reset where component count and thermal reliability are critical.

Availability

DS1833-10+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and verified performance across –40°C to +85°C.

Supply support for DS1833-10+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, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1833-10+T&R belongs to Maxim's EconoReset™ family-engineered specifically for cost-effective, single-function power-supply monitoring in resource-constrained embedded systems where reliability and minimal external components are essential.

FAQ

What is the exact V_CC trip voltage range for DS1833-10+T&R?

The DS1833-10+T&R has a guaranteed V_CC trip point range of 4.25 V (minimum) to 4.49 V (maximum) at +25°C and –40°C to +85°C, corresponding to its 10% tolerance specification for 5V supplies. This range is validated per the DC Electrical Characteristics table in the official Maxim datasheet (Rev. 5, page 4), and applies across the full industrial temperature range without derating.

Does DS1833-10+T&R require an external pull-up resistor on the RST pin?

No, DS1833-10+T&R includes an internal pull-up resistor of 3.75–6.25 kΩ, eliminating the need for an external component. This feature is explicitly stated in the "Features" section and confirmed in the "DC Electrical Characteristics" table under "Internal Pull-Up Resistor" (R_P). The RST pin is open-drain and actively drives low during reset; the internal resistor ensures a defined high state otherwise.

What is the reset pulse width specification for DS1833-10+T&R, and how is it guaranteed?

The DS1833-10+T&R guarantees a reset pulse width (t_RST) of 250–450 ms after V_CC returns to tolerance, with 350 ms typical. This timing is generated by an internal RC-based timer circuit-not dependent on external components-and is characterized across –40°C to +85°C per the "AC Electrical Characteristics" table (page 4 of datasheet). No external capacitor is needed or supported.

Is DS1833-10+T&R compatible with 3.3V microcontrollers?

No, DS1833-10+T&R is designed exclusively for 5V systems: its trip point (4.25–4.49 V) and absolute maximum V_CC rating (+7.0 V) target 5V rails. For 3.3V supervision, Maxim offers the DS1233A-10 (2.80–2.97 V trip) or DS1833-10 variants are not rated for 3.3V operation and may fail to assert reset correctly below 4.25 V.

What package type does DS1833-10+T&R use, and does it include thermal enhancement?

DS1833-10+T&R uses the SOT-223 package (4-pin, surface-mount) with an exposed thermal pad. Pin 4 is a dedicated ground terminal connected to this pad, enabling direct soldering to a PCB ground plane for improved thermal dissipation and reduced thermal resistance-critical for sustained operation in enclosed industrial enclosures.