Analog Devices Inc./Maxim Integrated DS1815R-10/T&R

Overview

DS1815R-10/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 provides 10% VCC trip point accuracy (2.80V–2.97V), guarantees 150ms minimum active-low reset pulse width, and operates from -40°C to +85°C in SOT-23 package.

For engineers reviewing the DS1815R-10/T&R datasheet, DS1815R-10/T&R pinout, DS1815R-10/T&R application, or DS1815R-10/T&R equivalent, key selection factors include guaranteed reset timeout, tolerance-specific trip voltage, push-pull drive capability, low quiescent current (28–35µA), and compatibility with 1.2V–5.5V supply rails.

Technical Context

The DS1815R-10/T&R integrates a temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±10% of nominal supply. Its internal circuitry asserts RST immediately upon out-of-tolerance detection and holds it active for ≥100ms (typ. 150ms) after VCC recovery.

Unlike open-drain reset supervisors, the DS1815R-10/T&R features a CMOS push-pull output capable of sourcing 350µA at 2.4V and sinking 10mA at 0.4V - enabling direct interface with logic inputs without external pull-up resistors.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package (3.0mm × 1.4mm × 1.1mm body height), RoHS-compliant, tape-and-reel format (T&R).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–33D2 and TPS3808G12DBVR, the DS1815R-10/T&R delivers fixed ±10% trip accuracy with zero external components and minimal footprint - making it optimal for cost-sensitive, space-constrained 3.3V industrial controllers where 2.80–2.97V detection is sufficient.

Availability

DS1815R-10/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, and medical handheld diagnostics requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for DS1815R-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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1815R-10/T&R belongs to Maxim's EconoReset family - engineered for low-cost, single-supply voltage monitoring in resource-constrained embedded systems where reliability and minimal external components are critical.

FAQ

What is the exact VCC trip voltage range for DS1815R-10/T&R?

The DS1815R-10/T&R has a guaranteed VCC trip point between 2.80V and 2.97V at -40°C to +85°C, corresponding to ±10% tolerance around a nominal 3.0V supply. This range is specified in the DC Electrical Characteristics table and applies across the full operating temperature range without derating.

Does DS1815R-10/T&R require an external pull-up resistor on the RST pin?

No. The DS1815R-10/T&R features a push-pull output stage that actively drives RST high and low. Unlike open-drain reset ICs, it does not require an external pull-up resistor - simplifying schematic design and reducing component count.

What is the minimum and maximum reset pulse width of DS1815R-10/T&R?

The DS1815R-10/T&R guarantees a reset pulse width between 100ms and 250ms, with a typical value of 150ms. This duration is measured from the moment VCC returns to in-tolerance until RST deasserts, ensuring adequate stabilization time for microprocessors and power supplies.

Can DS1815R-10/T&R operate with supply voltages below 3.0V?

Yes. The DS1815R-10/T&R supports supply voltages from 1.2V to 5.5V. Its internal reference and comparator remain functional down to 1.2V, and the RST output remains valid even as VCC drops to 0V - enabling robust brownout detection in low-voltage systems.

Is DS1815R-10/T&R compatible with both TO-92 and SOT-23 packages?

No. The DS1815R-10/T&R is specifically the SOT-23-3 tape-and-reel variant. While the DS1815 family includes TO-92 versions (e.g., DS1815R-10+), the "/T&R" suffix and part marking confirm this is the surface-mount SOT-23 package with 3-pin configuration and standardized land pattern.