Analog Devices Inc./Maxim Integrated DS1814BR-10-U

Overview

DS1814BR-10-U from Maxim Integrated is a 5V microprocessor supervisory circuit with watchdog timer, pushbutton reset control, and precise 10% VCC monitoring (trip point 4.25–4.50 V). It delivers active-low reset output, 140ms minimum reset pulse width, and operates across –40°C to +85°C in SOT-23-5 package. Used in embedded controllers to prevent runaway code during power transients.

For engineers reviewing the DS1814BR-10-U datasheet, DS1814BR-10-U pinout, DS1814BR-10-U application, or DS1814BR-10-U equivalent, key selection criteria include VCC trip accuracy, watchdog timeout (1.12 s), reset timing consistency, pushbutton debouncing capability, and compatibility with MAX823/24/25 designs.

Technical Context

The DS1814BR-10-U implements a precision bandgap-based voltage monitor with 10% tolerance for 5V systems, generating an active-low RST signal when VCC drops below 4.25 V. Its internal comparator includes 10 mV hysteresis to prevent chatter near threshold.

It integrates a 1.12-second watchdog timer triggered by ST input transitions and supports pushbutton reset via PBRST with hardware debouncing and guaranteed 140ms reset assertion. The RST output uses a push-pull driver valid down to 1.0 V VCC, with optional resistor pull-down enabling reset validity to 0 V.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package: 2.9 mm × 1.6 mm × 1.1 mm body, gull-wing leads, JEDEC MO-178 compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX823SESA+ and TPS3808G12DBVR, the DS1814BR-10-U uniquely combines fixed 10% 5V monitoring, integrated watchdog timer, and hardware-debounced pushbutton reset in one SOT-23-5 device-reducing BOM count and PCB area while maintaining industrial temperature operation.

Availability

DS1814BR-10-U is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, automotive body electronics, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS1814BR-10-U 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 DS1814BR-10-U belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically to replace discrete reset generators and watchdog timers in microcontroller-based systems with single-chip reliability and reduced board space.

FAQ

What is the exact VCC trip point range for DS1814BR-10-U?

The DS1814BR-10-U has a specified VCC trip point of 4.25 V (min) to 4.50 V (max), reflecting its 10% tolerance for nominal 5V systems. This range is guaranteed over the full industrial temperature range (–40°C to +85°C) and ensures consistent brown-out detection without requiring external calibration. The DS1814BR-10-U uses an internal temperature-compensated bandgap reference to maintain this accuracy across operating conditions.

Does DS1814BR-10-U support both watchdog and pushbutton reset simultaneously?

Yes, the DS1814BR-10-U supports both functions concurrently. As a 'B' variant (indicated by 'B' in DS1814B), it includes the ST input for watchdog strobing and the PBRST pin for pushbutton reset. Its pinout (RST, GND, PBRST, ST, VCC) enables independent use of both features: ST monitors firmware liveness, while PBRST provides user-initiated reset with hardware debouncing. The DS1814BR-10-U asserts RST for either condition.

Can DS1814BR-10-U operate below 5V, and what is its minimum functional VCC?

Yes, the DS1814BR-10-U operates from 1.0 V to 5.5 V. Its internal circuitry remains functional down to 1.0 V, and the RST output maintains valid logic levels (push-pull) across that range. Below 1.0 V, a 100 kΩ pull-down resistor from RST to GND extends valid reset assertion to 0 V VCC-critical for fail-safe shutdown in deep undervoltage scenarios. This behavior is explicitly characterized in the DS1814BR-10-U datasheet.

Is DS1814BR-10-U pin-compatible with MAX823 series devices?

Yes, the DS1814BR-10-U is pin- and function-compatible with the MAX823/24/25 family in SOT-23-5 package. Pin 1 (RST), Pin 2 (GND), Pin 4 (ST), and Pin 5 (VCC) align directly. While MAX823 variants may lack PBRST (Pin 3), the DS1814BR-10-U's Pin 3 (PBRST) can be left unconnected without affecting core supervision functionality-enabling drop-in replacement where pushbutton reset is not required.

What is the watchdog timeout specification for DS1814BR-10-U, and how is it disabled?

The DS1814BR-10-U watchdog timeout is 1.12 seconds (min) to 2.40 seconds (max), with 1.60 s typical. It is disabled by leaving the ST pin floating (high-impedance) or tri-stating the driving signal-no external components required. When ST is inactive, the watchdog timer halts and no reset is generated. This allows flexible enable/disable control in systems where watchdog supervision is conditional or unused during certain operational modes.