Analog Devices Inc./Maxim Integrated DS1812-10+T&R

Overview

DS1812-10+T&R from Maxim Integrated is a 5V microprocessor supervisory circuit with active-high push-pull reset output, precision voltage monitoring at 4.35 V (typ), 150 ms reset timeout, and operation from -40°C to +85°C in SOT-23 package. It automatically asserts reset during power failure and holds reset for ≥100 ms after VCC recovery to stabilize microprocessor startup.

For engineers reviewing the DS1812-10+T&R datasheet, DS1812-10+T&R pinout, DS1812-10+T&R application, or DS1812-10+T&R equivalent, key selection criteria include trip point tolerance (±10%), push-pull drive capability (350 µA VOH @ 2.4 V), low ICC (40 µA typ), and compatibility with 5V embedded control systems requiring reliable power-on reset sequencing.

Technical Context

The DS1812-10+T&R integrates a temperature-compensated bandgap reference and comparator to monitor VCC against a fixed 4.35 V (typ) threshold. Its internal timing circuit ensures reset remains asserted for 100–300 ms after VCC returns to tolerance, independent of supply slew rate.

It delivers a CMOS-compatible active-high push-pull output capable of sourcing 350 µA at 2.4 V and sinking 10 mA at 0.4 V, eliminating need for external pull-up resistors. No external components are required for basic reset generation in 5V microcontroller systems.

Key Specifications

Pinout & Package

DS1812-10+T&R is supplied in RoHS-compliant, lead-free SOT-23-3 surface-mount package (2.9 mm × 1.6 mm × 1.1 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX809SEUR+T and TPS3808G15DBVR, DS1812-10+T&R offers fixed 4.35 V trip with ±10% tolerance, integrated push-pull output, and minimal external component count - making it optimal for cost-sensitive, space-constrained 5V microcontroller reset applications where absolute trip precision is secondary to simplicity and reliability.

Availability

DS1812-10+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, and point-of-sale terminals requiring stable component supply and long-term production continuity.

Supply support for DS1812-10+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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The DS1812-10+T&R belongs to Maxim's EconoReset™ family of supervisory circuits, engineered specifically for low-cost, high-reliability power-on reset and brown-out protection in 5V microcontroller-based systems.

FAQ

What is the exact VCC trip point tolerance for DS1812-10+T&R?

The DS1812-10+T&R has a nominal VCC trip point of 4.35 V with a guaranteed tolerance of ±10%, meaning the actual trip voltage falls between 4.25 V (min) and 4.49 V (max) across temperature and supply variations. This tolerance is laser-trimmed at wafer test and specified in the DC Electrical Characteristics table of the official Maxim datasheet. DS1812-10+T&R uses this fixed threshold to trigger reset before standard 5V microcontrollers enter undefined operation.

Does DS1812-10+T&R require an external pull-up resistor on the RST pin?

No, DS1812-10+T&R features a push-pull active-high output stage that actively drives the RST pin high and low without external components. It sources up to 350 µA at 2.4 V and sinks up to 10 mA at 0.4 V, meeting standard 5V logic level requirements. This eliminates the need for a pull-up resistor, reducing BOM cost and PCB area - a key advantage over open-drain alternatives like the MAX809 series. DS1812-10+T&R is designed for direct connection to MCU reset inputs.

What is the guaranteed reset pulse width for DS1812-10+T&R after VCC recovery?

The DS1812-10+T&R guarantees a reset active time of 100 ms (min) to 300 ms (max) after VCC returns to within tolerance, with 150 ms typical. This timing is internally generated and independent of external capacitors or supply slew rate, ensuring consistent reset hold-off for microprocessor stabilization. The specification is validated across -40°C to +85°C and applies to all units of DS1812-10+T&R, enabling predictable system boot behavior without design iteration.

Can DS1812-10+T&R operate with supply voltages below 5V?

Yes, DS1812-10+T&R operates over a VCC range of 1.2 V to 5.5 V, but its 4.25–4.49 V trip window is optimized for 5V systems. Below ~4.2 V, the device will assert reset continuously and remain latched; it does not function as a low-voltage supervisor for sub-4V rails. For 3.3V or lower applications, alternative parts such as the DS1832 or TPS3808G01 are recommended. DS1812-10+T&R is intended exclusively for 5V power monitoring where precise brown-out detection near the upper rail is required.

Is DS1812-10+T&R pin-compatible with other devices in the DS18xx family?

DS1812-10+T&R shares identical SOT-23-3 pinout (RST-VCC-GND) with DS1811, DS1813, and DS1815 variants, but trip points differ: DS1811-5 = 4.63 V, DS1813-15 = 4.00 V, etc. Substituting without verifying trip voltage may cause premature or delayed reset assertion. DS1812-10+T&R is not pin-compatible with TO-92-packaged versions in socketed designs due to mechanical form factor differences, though electrical pin functions match. Always validate trip point and package fit before replacement.