Analog Devices Inc./Maxim Integrated DS1810R-15-U

Overview

DS1810R-15-U from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring reset IC with push-pull output, designed to automatically restart microprocessors after power failure. It asserts an active-low reset for 150 ms after V_CC returns to tolerance, features a 4.00–4.24 V trip point (±15% tolerance), operates from 1.2 V to 5.5 V, and supports -40°C to +85°C industrial temperature range.

For engineers reviewing the DS1810R-15-U datasheet, DS1810R-15-U pinout, DS1810R-15-U application, or DS1810R-15-U equivalent, key selection considerations include its guaranteed 150 ms reset timeout, push-pull output capable of sinking 10 mA at 0.4 V, 4.12 V typical V_CC trip point, operation down to 1.2 V supply, and compatibility with TO-92 and SOT-23 packages.

Technical Context

The DS1810R-15-U integrates a precision temperature-compensated voltage reference and comparator to monitor V_CC against a fixed threshold (4.00–4.24 V). Upon detecting undervoltage, it immediately asserts RST; upon recovery, it holds RST active for 100–300 ms (typ. 150 ms) to ensure system stability.

Its push-pull output drives high/low without external pull-up, enabling valid logic states even as V_CC drops below 1.2 V when a 100 kΩ resistor ties RST to GND - supporting robust power-down sequencing and zero-volt V_CC reset validity.

Key Specifications

Pinout & Package

DS1810R-15-U is available in both TO-92 and SOT-23 packages. Pin functions are identical across both variants: Pin 1 = RST (active-low push-pull reset output), Pin 2 = V_CC (power supply input), Pin 3 = GND (ground reference).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–41D and TPS3808G15, the DS1810R-15-U offers integrated push-pull drive, guaranteed 150 ms reset hold, and unique zero-volt V_CC reset validity - making it optimal for cost-sensitive, space-constrained, and fail-safe-critical applications where external components must be minimized.

Availability

DS1810R-15-U is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body electronics, smart energy meters, and medical handheld devices requiring stable component supply and long-term lifecycle support.

Supply support for DS1810R-15-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 systems.

The DS1810R-15-U belongs to the EconoReset™ family of supervisory circuits, engineered specifically for cost-effective, single-supply voltage monitoring and reliable microprocessor reset generation in resource-constrained embedded systems.

FAQ

What is the exact V_CC trip point range for DS1810R-15-U?

The DS1810R-15-U has a guaranteed V_CC trip point range of 4.00 V to 4.24 V at +25°C, reflecting its ±15% tolerance designation. This range is maintained across the full operating temperature range (-40°C to +85°C) due to internal temperature compensation. The typical trip point is 4.12 V, and the device uses a precision voltage reference to ensure consistent performance without external calibration. DS1810R-15-U is specified to assert reset when V_CC falls below this window and release it only after returning above the upper limit plus hysteresis.

Does DS1810R-15-U require an external pull-up resistor on the RST pin?

No, DS1810R-15-U does not require an external pull-up resistor because it features a push-pull output stage that actively drives both high and low states. The RST pin can source current when high and sink up to 10 mA when low, eliminating reliance on external components for logic-level definition. This simplifies PCB layout and improves noise immunity compared to open-drain alternatives. DS1810R-15-U's push-pull architecture is integral to its function and is explicitly documented in the block diagram and electrical specifications.

How long does DS1810R-15-U hold the reset signal active after V_CC recovers?

DS1810R-15-U holds the RST signal active for 100–300 ms after V_CC returns to an in-tolerance condition, with a typical duration of 150 ms. This guaranteed timeout ensures sufficient time for power supply stabilization and microprocessor internal circuitry to settle before release. The timing is internally generated and independent of external capacitors or resistors. DS1810R-15-U's fixed 150 ms typ. delay is a core feature enabling predictable, repeatable system boot behavior across temperature and supply variations.

Can DS1810R-15-U operate when V_CC drops below 1.2 V?

Yes, DS1810R-15-U maintains a valid RST output even as V_CC approaches 0 V - but only when a 100 kΩ resistor is connected between the RST pin and ground. In this configuration, the push-pull output can sink current to hold RST low during deep brownout. Without the resistor, DS1810R-15-U ceases valid operation below 1.2 V. This zero-volt capability is a documented design feature of DS1810R-15-U and is validated in the "RST Valid to 0 Volts V_CC" application diagram.

What package options are available for DS1810R-15-U?

DS1810R-15-U is offered in two standard packages: the through-hole TO-92 and the surface-mount SOT-23. Both share identical pinout (RST–V_CC–GND) and electrical specifications. The TO-92 variant suits prototyping and legacy board designs, while the SOT-23 supports high-density automated assembly. Mechanical drawings for both packages are published in Maxim's official documentation. DS1810R-15-U's dual-package availability allows flexible integration without redesigning the reset circuit topology.