Analog Devices Inc./Maxim Integrated DS1834+

Overview

DS1834+ from Maxim Integrated (now Analog Devices) is a dual-voltage power-on reset supervisor IC monitoring both 5V and 3.3V supplies, featuring pushbutton reset input, 350 ms reset pulse width, CMOS push-pull outputs, and selectable ±5%/±10% or ±10%/±20% voltage tolerances. It serves in embedded microcontroller systems requiring reliable dual-rail power sequencing and manual reset override.

For engineers reviewing the DS1834+ datasheet, DS1834+ pinout, DS1834+ application, or DS1834+ equivalent, key selection considerations include dual-supply trip point configuration, PBRST debounced timing, RST output polarity (active-low), supply current draw at 3.6V/5.5V, and compatibility with 8-pin SOIC/µ-SOP/DIP footprints.

Technical Context

The DS1834+ integrates two independent precision voltage comparators with temperature-compensated references to monitor 5VIN and 3.3VIN simultaneously. Its internal power selector draws operating current from the higher of the two inputs, enabling stable operation during asymmetric rail transitions.

Reset assertion is triggered by out-of-tolerance detection on either supply, with fixed 350 ms minimum reset hold time after return to tolerance. The PBRST pin provides hardware-debounced manual reset control, forcing both RST outputs active for ~350 ms post-release, independent of supply status.

Key Specifications

Pinout & Package

DS1834+ is available in 8-pin SOIC (150-mil), 8-pin µ-SOP (118-mil), and 8-pin DIP (300-mil) packages - all pin-compatible with identical terminal mapping.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage reset supervisor applications.

Compared with MAX6326–MAX6328 and TPS3808G33, the DS1834+ uniquely integrates dual-rail monitoring, hardware-debounced pushbutton reset, and push-pull outputs in one 8-pin package-eliminating design compromises in mixed-voltage embedded systems.

Availability

DS1834+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive infotainment head units, and network edge routers requiring stable component supply across extended product lifecycles.

Supply support for DS1834+ 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

Analog Devices (via acquisition of Maxim Integrated) designs high-performance analog, mixed-signal, and power management ICs for precision sensing, power integrity, and reliable system control.

The DS1834+ belongs to Maxim's EconoReset™ family-engineered specifically for cost-effective, footprint-efficient dual-voltage power supervision in resource-constrained embedded systems.

FAQ

What is the reset output polarity of the DS1834+?

The DS1834+ provides active-low reset outputs on both 5V RST and 3.3V RST pins. These are CMOS push-pull outputs that drive low during reset assertion and high when released. This polarity aligns with standard microcontroller reset inputs requiring an active-low signal to initiate boot sequence restart. The DS1834+ does not offer active-high variants in its base configuration.

How does the DS1834+ select its internal power source?

The DS1834+ automatically draws internal operating current from the higher of the two supply inputs-either 5VIN or 3.3VIN. This ensures uninterrupted supervision during asymmetric power-up/down sequences, such as when one rail ramps faster than the other. The DS1834+ continues functional operation as long as at least one input remains above 1.2 V, and its RST outputs remain valid even below that threshold due to push-pull architecture.

Can the DS1834+ be used with non-standard supply voltages like 2.5V or 4.2V?

Yes-the DS1834+ supports input voltages from 1.2 V to 5.5 V on both 5VIN and 3.3VIN pins. While optimized for nominal 5V and 3.3V rails, it can monitor any two DC supplies within that range. Trip points scale proportionally based on TOL pin configuration, allowing adaptation to custom voltage domains-for example, using 3.3VIN as a 2.5V monitor with appropriate TOL grounding.

What is the purpose of the 5V TOL and 3.3V TOL pins on the DS1834+?

The 5V TOL and 3.3V TOL pins configure the voltage detection thresholds: tying 5V TOL to GND selects ±5% tolerance (4.50–4.75 V), while tying it to 5VIN selects ±10% (4.25–4.49 V); similarly, 3.3V TOL to GND gives ±10% (2.80–2.97 V), and to 3.3VIN gives ±20% (2.47–2.64 V). This allows tailoring sensitivity to specific power supply regulation specs without redesigning the supervisor circuit.

Does the DS1834+ require external pull-up resistors on its RST outputs?

No-the DS1834+ features CMOS push-pull RST outputs, eliminating the need for external pull-up resistors. This reduces BOM count and PCB area versus open-drain alternatives like the DS1834A. The push-pull structure actively drives both high and low states, ensuring fast, rail-to-rail reset signaling without reliance on external components or bus wiring constraints.