Analog Devices Inc./Maxim Integrated DS1836B-10

Overview

DS1836B-10 from Maxim Integrated is a dual-supply microprocessor supervisory IC with integrated power-switching, precision reset generation, and non-maskable interrupt (NMI) functionality. It monitors 5V VCC supply with 4.25V–4.50V reset threshold, switches VOUT between VCC and battery at 3.8V/3.9V trip points, maintains reset for 350ms after recovery, and asserts NMI when sense input falls below 1.25V - ideal for PIC-based embedded systems requiring battery backup and early power-fail warning.

For engineers reviewing the DS1836B-10 datasheet, DS1836B-10 pinout, DS1836B-10 application, or DS1836B-10 equivalent, key selection criteria include its 5V-specific VCC trip point (4.25–4.50V), VCC-to-VBAT switchover at 3.8V/3.9V, CMOS RST output, -40°C to +85°C operation, and compatibility with 8-pin DIP or SO packages in industrial and microcontroller-based power management designs.

Technical Context

The DS1836B-10 implements a precision bandgap-referenced comparator for VCC monitoring and an independent high-impedance IN pin comparator for user-defined voltage sensing. Its internal logic generates a 350ms reset pulse upon VCC return to tolerance and forces RST active during transients, while simultaneously managing seamless power source switching between VCC and VBAT based on hysteresis-controlled thresholds.

Unlike DS1836C/D variants, the DS1836B-10 uses 5V-specific thresholds: VCC trip point of 4.25–4.50V for reset assertion, 3.80–3.90V for VCC→VBAT switchover, and 3.90–4.00V for VBAT→VCC restoration. The NMI output is open-drain and requires external pull-up; RST is CMOS push-pull with valid operation down to 1.2V supply.

Key Specifications

Pinout & Package

DS1836B-10 is available in 8-pin DIP (300mil) and 8-pin SO (150mil) packages. Both share identical pin mapping and function assignment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX690TSA+ and TPS3808G33DBVR, the DS1836B-10 uniquely integrates three functions-precision 5V reset, automatic VCC/VBAT power switching, and programmable NMI-in a single 8-pin package, eliminating discrete components and enabling robust battery-backed operation without firmware dependency.

Availability

DS1836B-10 is available at Aetrix Electronics and suitable for industrial PLC power management, PIC microcontroller systems, medical diagnostic equipment, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for DS1836B-10 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 and mixed-signal ICs for power management, sensing, and interface applications across industrial, automotive, and communications markets.

The DS1836B-10 belongs to Maxim's MicroManager family of supervisory ICs, engineered specifically for microprocessor-based systems needing coordinated reset, power-fail warning, and battery backup switching in compact 8-pin formats.

FAQ

What is the exact VCC reset threshold range for DS1836B-10?

The DS1836B-10 has a specified VCC reset threshold of 4.25V (minimum) to 4.50V (maximum) at -40°C to +85°C. This 5V-specific window ensures reliable reset assertion before the 5V rail drops below levels that could destabilize attached microcontrollers. The DS1836B-10 datasheet confirms this range under "DC Electrical Characteristics" for part suffix "-10", distinguishing it from -05 and -20 variants.

Does DS1836B-10 support true 3.3V operation?

No, DS1836B-10 is a 5V-specific variant and does not support true 3.3V operation. Its VCC reset threshold (4.25–4.50V) and power-switch thresholds (3.80–4.00V) are optimized for 5V systems. For 3.3V applications, DS1836C/D variants with 2.6–2.97V thresholds should be used instead. DS1836B-10 will not assert reset or switch correctly if powered from a nominal 3.3V rail.

How does the NMI function work in DS1836B-10?

The NMI output in DS1836B-10 is an open-drain signal activated when the voltage at the IN pin falls below 1.15–1.35V. It uses an internal bandgap reference for accuracy and provides early power-fail warning independent of the main VCC monitor. DS1836B-10 requires an external pull-up resistor (typically 10kΩ) on NMI to ensure proper logic-high state when inactive. This allows system firmware to initiate controlled shutdown before RST activates.

What package options are available for DS1836B-10?

DS1836B-10 is offered in two industry-standard packages: 8-pin plastic DIP (300mil width) and 8-pin SO (150mil width). Both packages share identical pinout and electrical specifications. The SO version supports surface-mount assembly and reduced PCB footprint, while the DIP variant facilitates through-hole prototyping and legacy board compatibility. No other package types are specified for DS1836B-10.

Can DS1836B-10 maintain valid RST output when VCC drops to 0V?

Yes, DS1836B-10 can maintain a valid RST output even when VCC reaches 0V, provided VBAT remains above 1.2V. Its RST output uses a push-pull structure (unlike open-drain NMI), and the datasheet confirms valid operation down to 1.2V supply. With VBAT active, DS1836B-10 continues asserting RST until VBAT also collapses - a key reliability feature for battery-backed systems where DS1836B-10 ensures reset remains asserted throughout full power loss.