Analog Devices Inc./Maxim Integrated DS1815-5

Overview

DS1815-5 from Maxim Integrated (now Analog Devices) is a precision voltage supervisor IC with push-pull active-low reset output, designed for microprocessor power monitoring. It asserts reset when VCC falls below 2.98V–3.15V (5% tolerance), holds reset active for 100–250ms after VCC recovery, and operates from -40°C to +85°C in TO-92 or SOT-23 packages - used in embedded controllers requiring reliable power-up sequencing.

For engineers reviewing the DS1815-5 datasheet, DS1815-5 pinout, DS1815-5 application, or DS1815-5 equivalent, key selection criteria include VCC trip point accuracy (3.06V typ), 150ms reset timeout, push-pull output drive capability (±10mA sink/source), low quiescent current (35µA max), and compatibility with 1.2V–5.5V supply rails.

Technical Context

The DS1815-5 integrates a temperature-compensated bandgap reference and high-precision comparator to detect VCC deviations against its factory-trimmed 5% threshold. Its internal timing circuit ensures reset remains asserted for ≥100ms after VCC returns within tolerance, independent of supply slew rate.

It features a CMOS push-pull output stage capable of sourcing 350µA at VCC–0.1V and sinking 10mA at 0.4V, eliminating external pull-up resistors. No external components are required for basic reset generation, supporting direct interface to microcontroller reset inputs.

Key Specifications

Pinout & Package

DS1815-5 is available in TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages. Both share identical pin mapping and functional assignment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–33D and TPS3808G33, the DS1815-5 offers lower BOM cost and simpler implementation with fixed 150ms timing and no external components, while trading off trip accuracy and supply flexibility for robustness in cost-sensitive industrial applications.

Availability

DS1815-5 is available at Aetrix Electronics and suitable for industrial control systems, smart energy meters, medical handheld devices, and automotive body electronics requiring stable component supply and long-term availability.

Supply support for DS1815-5 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 markets.

The DS1815-5 belongs to Maxim's EconoReset™ family of voltage supervisors, engineered to replace discrete reset circuits with minimal external components while delivering reliable power-fail detection and reset timing for microprocessor-based systems.

FAQ

What is the exact VCC trip point range for DS1815-5?

The DS1815-5 has a guaranteed VCC trip point range of 2.98V to 3.15V at +25°C, corresponding to a 5% tolerance centered at 3.06V. This specification is validated across the full operating temperature range (-40°C to +85°C) and is factory-trimmed using a temperature-compensated voltage reference to maintain accuracy over environmental variation. The DS1815-5 does not require external calibration.

Does DS1815-5 require an external pull-up resistor on the RST pin?

No, the DS1815-5 features a push-pull output stage that actively drives both high and low states on the RST pin. It can source up to 350µA and sink up to 10mA, enabling direct connection to standard CMOS microcontroller reset inputs without any external pull-up resistor. This simplifies design and reduces bill-of-materials count compared to open-drain alternatives like the MAX6326 series.

How long is the reset pulse duration after VCC recovers for DS1815-5?

The DS1815-5 holds the RST output active for 100ms to 250ms after VCC rises above its trip threshold, with a typical value of 150ms. This built-in timeout is generated by an internal RC timer and is independent of VCC slew rate or external components. It ensures sufficient stabilization time for both the power supply and connected microprocessor before release of the reset signal.

Can DS1815-5 operate from a 1.8V supply?

Yes, the DS1815-5 supports supply voltages from 1.2V to 5.5V, making it compatible with 1.8V systems. However, its VCC trip point remains fixed at 2.98V–3.15V - meaning it will assert reset whenever VCC falls below that range, regardless of nominal rail voltage. For 1.8V applications, the DS1815-5 must monitor a higher-voltage auxiliary rail (e.g., 3.3V) rather than the core 1.8V domain directly.

What package options are available for DS1815-5?

The DS1815-5 is offered in two standard packages: TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount). Both share identical pinout (RST-VCC-GND), electrical specifications, and thermal performance. The TO-92 variant suits prototyping and low-volume assembly, while the SOT-23 supports automated pick-and-place and space-constrained PCB layouts. Mechanical drawings are available on the Analog Devices website.