Analog Devices Inc./Maxim Integrated DS1815R-5+T&R

Overview

DS1815R-5+T&R 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 150ms after VCC returns to tolerance, features ±5% VCC trip accuracy at 3.06V nominal, operates from -40°C to +85°C, and uses a temperature-compensated reference for stable power monitoring in embedded control systems.

For engineers reviewing the DS1815R-5+T&R datasheet, DS1815R-5+T&R pinout, DS1815R-5+T&R application, or DS1815R-5+T&R equivalent, key selection criteria include guaranteed 150ms reset timeout, 3.06V ±5% trip threshold, push-pull output drive capability, SOT-23-3 package compatibility, and operation down to 0V VCC during reset assertion.

Technical Context

The DS1815R-5+T&R integrates a precision bandgap voltage reference and comparator to monitor VCC against a fixed 3.06V threshold with ±5% tolerance. Its internal timing circuit ensures RST remains asserted for 100–250ms after VCC recovery, independent of supply slew rate.

It delivers a CMOS-compatible push-pull output capable of sourcing 350µA at 2.4V and sinking 10mA at 0.4V, enabling direct interface with microcontroller reset inputs without external pull-up resistors. The device draws only 28–35µA quiescent current over full temperature range.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint and gull-wing leads; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01DBVR and MAX6326UR29D3+, the DS1815R-5+T&R offers the broadest trip tolerance (±5%) for cost-sensitive industrial designs, retains reset assertion down to 0V VCC-critical for brown-out resilience-and requires no external components due to its integrated push-pull driver.

Availability

DS1815R-5+T&R is available at Aetrix Electronics and suitable for industrial automation, smart energy metering, medical device power sequencing, and automotive body electronics requiring stable component supply across long production lifecycles.

Supply support for DS1815R-5+T&R 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 DS1815R-5+T&R belongs to Maxim's EconoReset family-engineered for low-cost, single-supply voltage monitoring in resource-constrained embedded systems where simplicity, reliability, and minimal external components are critical.

FAQ

What is the exact VCC trip voltage range for DS1815R-5+T&R?

The DS1815R-5+T&R has a guaranteed VCC trip point of 2.98V to 3.15V at 25°C, corresponding to a nominal 3.06V with ±5% tolerance. This range is specified over the full operating temperature range (-40°C to +85°C) and accounts for initial accuracy, temperature drift, and unit-to-unit variation. The DS1815R-5+T&R uses a precision temperature-compensated reference to maintain this window without external calibration.

Does DS1815R-5+T&R require an external pull-up resistor on the RST pin?

No, the DS1815R-5+T&R features a push-pull output stage that actively drives RST high or low, eliminating the need for an external pull-up resistor. This reduces BOM count and PCB area while ensuring fast, deterministic reset release. The DS1815R-5+T&R can source up to 350µA and sink up to 10mA on the RST pin, making it compatible with standard microcontroller reset inputs without additional components.

How long does DS1815R-5+T&R hold reset active after VCC returns to tolerance?

The DS1815R-5+T&R holds the RST pin active low for 100ms to 250ms after VCC rises above the trip threshold (2.98V), with a typical value of 150ms. This timeout is internally generated and independent of VCC slew rate or external components. The DS1815R-5+T&R ensures sufficient stabilization time for both the power supply and connected microprocessor before releasing reset, meeting common boot sequencing requirements.

Can DS1815R-5+T&R operate when VCC drops to 0V?

Yes, the DS1815R-5+T&R maintains valid reset assertion (RST = low) even when VCC falls to 0V, as confirmed in the datasheet's "RST VALID TO 0 VOLTS VCC" diagram. Its internal circuitry continues to monitor and assert reset during deep brown-out conditions. This behavior is critical for preventing erratic MCU operation during catastrophic power collapse and distinguishes the DS1815R-5+T&R from many competing reset ICs with minimum VCC operating limits.

What package type is used for DS1815R-5+T&R?

The DS1815R-5+T&R is supplied in the SOT-23-3 surface-mount package, with pin 1 (RST), pin 2 (VCC), and pin 3 (GND) in standard gull-wing configuration. This 1.3mm × 2.9mm footprint supports automated assembly and provides thermal and electrical performance suitable for industrial and automotive applications. The DS1815R-5+T&R is not offered in TO-92 for this specific variant (R-5 suffix denotes SOT-23).