Analog Devices Inc./Maxim Integrated DS1815-10+T&R

Overview

DS1815-10+T&R from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring supervisory IC that provides active-low reset assertion during power failure or out-of-tolerance VCC conditions. It features a 2.80–2.97 V trip point (10% tolerance), 150 ms minimum reset pulse width, push-pull output, and operates from -40°C to +85°C in SOT-23 package - used for reliable microprocessor reset control in embedded power management systems.

For engineers reviewing the DS1815-10+T&R datasheet, DS1815-10+T&R pinout, DS1815-10+T&R application, or DS1815-10+T&R equivalent, key selection criteria include VCC trip accuracy (±10%), guaranteed 100–250 ms reset timeout, push-pull drive capability (10 mA sink), low ICC (28–35 µA), and compatibility with 1.2–5.5 V supply rails.

Technical Context

The DS1815-10+T&R integrates a temperature-compensated bandgap reference and comparator to detect VCC deviations against its factory-trimmed 10% threshold (2.80–2.97 V). Its internal timing circuit ensures RST remains asserted for ≥100 ms after VCC recovery, independent of external components.

It uses CMOS output stage with push-pull configuration, enabling direct interface to microcontroller reset inputs without pull-up resistors. The device asserts RST down to 0 V on VCC, supporting valid reset signaling even during brownout collapse.

Key Specifications

Pinout & Package

SOT-23 surface-mount package (3-pin, 1.3 mm × 2.9 mm footprint) with JEDEC MO-178AC outline; 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 TPS3808G12DBVR and MAX6326UR29D3+, the DS1815-10+T&R delivers fixed 10%-tolerance 3.3 V supervision with integrated push-pull drive and zero-VCC reset validity - simplifying layout and improving reliability in cost-sensitive industrial microcontroller systems.

Availability

DS1815-10+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, point-of-sale terminals, and smart energy meters requiring stable component supply and long-term production continuity.

Supply support for DS1815-10+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 high-performance analog, mixed-signal, and power management ICs for precision sensing, signal conditioning, and system-level supervision.

The DS1815-10+T&R belongs to Maxim's EconoReset™ family - engineered for cost-effective, single-chip power-fail detection and microprocessor reset generation in space- and budget-constrained embedded systems.

FAQ

What is the exact VCC trip voltage range for DS1815-10+T&R?

The DS1815-10+T&R has a guaranteed VCC trip point between 2.80 V (minimum) and 2.97 V (maximum), corresponding to a nominal 2.88 V threshold with ±10% tolerance. This range is factory-trimmed and temperature-compensated, ensuring consistent 3.3 V rail supervision across -40°C to +85°C without external calibration. The DS1815-10+T&R does not require resistor dividers or trimming components.

Does DS1815-10+T&R require an external pull-up resistor on the RST pin?

No, the DS1815-10+T&R features a push-pull output stage that actively drives RST high (to VCC – 0.1 V) and low (to 0.4 V at 10 mA), eliminating the need for an external pull-up resistor. This reduces BOM count and improves noise immunity compared to open-drain reset supervisors. The DS1815-10+T&R is designed for direct connection to standard CMOS reset inputs.

How long does DS1815-10+T&R hold RST active after VCC returns to tolerance?

The DS1815-10+T&R holds RST active for 100–250 ms after VCC rises above its trip threshold, with a typical value of 150 ms. This guaranteed timeout allows power supplies and microprocessors to stabilize fully before releasing reset. The timing is internally generated and independent of external components, making the DS1815-10+T&R highly repeatable across units and temperatures.

Can DS1815-10+T&R operate with supply voltages below 3.3 V?

Yes, the DS1815-10+T&R operates across a 1.2 V to 5.5 V supply range and maintains valid reset assertion even as VCC drops to 0 V. Its internal reference and comparator remain functional down to 1.2 V, and the RST output remains asserted throughout full VCC collapse - a key feature for robust brownout detection. This behavior is confirmed for the DS1815-10+T&R in its absolute maximum and operating condition specifications.

Is DS1815-10+T&R pin-compatible with other DS1815 variants like DS1815-5 or DS1815-20?

Yes, all DS1815 variants - including DS1815-5, DS1815-10+T&R, and DS1815-20 - share identical SOT-23 pinout (RST/VCC/GND), package dimensions, and electrical interface. Only the VCC trip point differs: 2.98–3.15 V (±5%), 2.80–2.97 V (±10%), and 2.47–2.64 V (±20%). No PCB changes are needed when substituting DS1815-10+T&R for another DS1815 variant in the same package.