Analog Devices Inc./Maxim Integrated DS1834DS

Overview

DS1834DS from Maxim Integrated (now Analog Devices) is a dual-voltage power-on reset supervisor IC monitoring both 5V and 3.3V supplies with independent tolerance selection, pushbutton reset input, and CMOS push-pull outputs. It asserts active-low reset signals for each rail during out-of-tolerance conditions or manual override, holding reset for 350 ms after recovery - used in embedded controllers, industrial PLCs, and dual-rail telecom modules.

For engineers reviewing the DS1834DS datasheet, DS1834DS pinout, DS1834DS application, or DS1834DS equivalent, key selection criteria include dual-supply trip point configurability (5% or 10% for 5V; 10% or 20% for 3.3V), internal 40 kΩ pull-up on PBRST, guaranteed 350 ms reset timeout, and operation down to 1.2 V supply while maintaining valid RST outputs.

Technical Context

The DS1834DS integrates two independent voltage monitors with selectable trip thresholds via dedicated TOL pins, enabling precise adaptation to system-specific 5V (4.50–4.75 V at 5% tol) and 3.3V (2.80–2.97 V at 10% tol) supply tolerances. Its internal power selector draws operating current from the higher of 5VIN or 3.3VIN, ensuring robust functionality across mixed-rail environments.

It features a debounced pushbutton reset input (PBRST) with 2 ms minimum low pulse detection and generates synchronized 350 ms reset pulses on both *RST outputs upon release. The CMOS push-pull output structure eliminates external pull-ups and supports valid logic levels even when supply drops below 1.2 V - unlike open-drain variants such as DS1834A.

Key Specifications

Pinout & Package

DS1834DS is available in 8-pin SOIC (150-mil), 8-pin µ-SOP (118-mil), and 8-pin DIP (300-mil) packages. All variants share identical pin mapping and function.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply reset monitoring applications.

Compared with MAX6326–MAX6328 and TPS3808G33, the DS1834DS uniquely integrates dual-rail supervision, hardware-selectable tolerances, and debounced pushbutton reset in a single 8-pin package - reducing BOM count, PCB area, and design validation effort for mixed-voltage systems.

Availability

DS1834DS is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical diagnostic modules, and automotive infotainment head units requiring stable component supply and long-term lifecycle support.

Supply support for DS1834DS 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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1834DS belongs to Maxim's EconoReset™ family of voltage supervisors, engineered specifically for cost-effective, high-reliability power monitoring in dual-rail embedded systems with minimal external components.

FAQ

What is the function of the 5V TOL and 3.3V TOL pins on the DS1834DS?

The 5V TOL and 3.3V TOL pins on the DS1834DS configure the voltage trip thresholds for their respective supplies. When tied to GND, 5V TOL selects a 5% tolerance (4.50–4.75 V), and 3.3V TOL selects 10% (2.80–2.97 V). When tied to their supply rails, they select 10% and 20% tolerances respectively. This hardware-based selection eliminates calibration software or external resistors. The DS1834DS uses these settings to determine when to assert its corresponding *RST output.

Does the DS1834DS require external pull-up resistors on its reset outputs?

No, the DS1834DS does not require external pull-up resistors on its 5V RST and 3.3V RST outputs. It features CMOS push-pull outputs capable of actively driving high or low states. This differs from the DS1834A variant, which uses open-drain NMOS outputs and mandates external pull-ups. The DS1834DS's push-pull architecture simplifies board layout and reduces component count - a key advantage confirmed in its datasheet and application diagrams.

How long does the DS1834DS hold reset after a pushbutton press?

The DS1834DS holds both 5V RST and 3.3V RST active for approximately 350 ms after the PBRST pin is released. This timing is guaranteed across temperature and supply voltage (200–500 ms min–max range), matching the power-up reset timeout. The internal timer starts upon PBRST rising edge and ensures consistent reset duration regardless of how long the button was held - provided the initial low pulse exceeds 2 ms. This behavior is explicitly defined in the DS1834DS AC Electrical Characteristics table.

Can the DS1834DS operate if only one supply (e.g., 3.3VIN) is present?

Yes, the DS1834DS can operate with only 3.3VIN applied, as long as it remains within 1.2–5.5 V. Its internal power selector draws current from the higher available supply - so with only 3.3VIN present, it powers itself from that rail and monitors 3.3VIN for out-of-tolerance conditions. The 5VIN input is ignored unless present and higher. The DS1834DS will still assert 3.3V RST correctly and respond to PBRST. This capability is verified in the Recommended DC Operating Conditions and Absolute Maximum Ratings sections.

What is the maximum supply slew rate the DS1834DS can reliably detect?

The DS1834DS guarantees reliable detection of supply transients with a minimum slew rate of 300 µs for transitions between VINTP(MIN) and VINTP(MAX), as specified in the AC Electrical Characteristics table under parameter tF. This means it can accurately capture brownout events occurring over ≥300 µs - fast enough for most DC/DC converter and LDO response times. Slower sags may be missed; faster ones (down to 2 µs noise immunity limit) are rejected as noise. This performance is intrinsic to the DS1834DS's comparator design and temperature-compensated reference.