Analog Devices Inc./Maxim Integrated DS1834D

Overview

DS1834D from Maxim Integrated (now Analog Devices) is an active-high dual voltage supervisor IC that monitors 5V and 3.3V supplies, provides pushbutton reset override, asserts reset for 350 ms after power recovery, and features CMOS push-pull outputs. It operates from −40°C to +85°C and supports dual-supply systems with selectable 5% or 10% 5V tolerance and 10% or 20% 3.3V tolerance.

For engineers reviewing the DS1834D datasheet, DS1834D pinout, DS1834D application, or DS1834D equivalent, key selection criteria include dual-rail monitoring capability, active-high reset polarity, tolerance-selectable trip points, pushbutton debouncing, and compatibility with 8-pin DIP/SOIC/µ-SOP packages in industrial embedded control and dual-voltage microcontroller systems.

Technical Context

The DS1834D integrates two independent voltage comparators with precision temperature-compensated references, each feeding a latch-driven reset generator with fixed 350 ms timeout. Its internal power selector draws operating current from the higher of 5VIN or 3.3VIN, enabling stable operation during supply transients.

Reset assertion is triggered when either supply falls outside its configured tolerance band; both RST outputs remain active for 350 ms after return to tolerance. The PBRST input is internally pulled up to VIN(MAX) via 40 kΩ and debounced, forcing both resets active for ~350 ms after release.

Key Specifications

Pinout & Package

DS1834D is available in 8-pin DIP (300-mil), 8-pin SOIC (150-mil), and 8-pin µ-SOP (118-mil) packages. All variants share identical pin mapping and function assignment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–MAX6328 and TPS3808G33, the DS1834D uniquely integrates coordinated dual-rail supervision, user-configurable tolerances, and hardware-debounced pushbutton reset in a single 8-pin package - reducing component count, PCB area, and timing uncertainty in mixed-voltage embedded systems.

Availability

DS1834D 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 and long-term design-in support.

Supply support for DS1834D 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 high-reliability industrial, automotive, and medical applications.

The DS1834D belongs to Maxim's EconoReset™ family of voltage supervisors, engineered specifically for cost-effective, dual-rail power monitoring in resource-constrained embedded systems with strict reset timing requirements.

FAQ

What is the reset polarity of the DS1834D?

The DS1834D features active-high reset outputs on both 5V RST and 3.3V RST pins. When either supply falls out of tolerance, the corresponding RST pin transitions from low to high and remains high for 350 ms after the supply returns to tolerance. This eliminates the need for external inverters when interfacing with MCUs that require high-active reset signals, and is explicitly confirmed in the device marking "DS1834D Active High Reset" and functional description.

How does the DS1834D select its internal power source?

The DS1834D automatically draws its internal operating current from whichever input - 5VIN or 3.3VIN - is at the higher voltage level. This ensures continuous supervision functionality even during asymmetric power sequencing or brownout conditions where one rail collapses before the other. The specification confirms this behavior in the "Operation" section and lists ICC measurements separately for 3.6V and 5.5V supply conditions.

Can the DS1834D monitor both 5V and 3.3V supplies simultaneously?

Yes, the DS1834D continuously and independently monitors both 5VIN and 3.3VIN using dedicated precision voltage comparators and temperature-compensated references. Each supply has its own trip threshold (configurable via TOL pins) and dedicated RST output. The block diagram, pin assignment, and "Dual EconoReset" product name confirm true concurrent dual-rail supervision - not multiplexed or time-shared monitoring.

What is the purpose of the PBRST pin on the DS1834D?

The PBRST pin on the DS1834D provides a hardware-debounced manual reset input. Pulling it low for ≥2 ms forces both 5V RST and 3.3V RST outputs active for ~350 ms after release. It includes an internal 40 kΩ pull-up to VIN(MAX) and integrated debouncing circuitry - eliminating external components. This functionality is documented in the "Pushbutton Reset" section and timing diagram Figure 4.

Does the DS1834D require external pull-up resistors on its RST outputs?

No, the DS1834D does not require external pull-up resistors on its RST outputs because it uses CMOS push-pull drivers - unlike the open-drain DS1834A variant. The datasheet explicitly states "CMOS output for low current operation on the DS1834 and DS1834D" and specifies VOH and IOL parameters confirming active drive capability. This allows direct connection to MCU reset inputs without additional components.