Analog Devices Inc./Maxim Integrated DS1812R-15/T&R

Overview

DS1812R-15/T&R from Maxim Integrated is a precision voltage-monitoring reset IC with active-high push-pull output, 4.00 V to 4.24 V VCC trip point, 150 ms reset timeout, and -40°C to +85°C operating temperature - used for reliable microprocessor power-up sequencing in embedded control systems.

For engineers reviewing the DS1812R-15/T&R datasheet, DS1812R-15/T&R pinout, DS1812R-15/T&R application, or DS1812R-15/T&R equivalent, key selection criteria include guaranteed 150 ms reset hold time after VCC recovery, ±15% trip tolerance (DS1812-15 variant), push-pull output drive capability (350 µA VOH, 10 mA IOL), and SOT-23 package compatibility with automated assembly.

Technical Context

The DS1812R-15/T&R implements a precision temperature-compensated voltage reference and comparator to detect VCC out-of-tolerance conditions. It asserts RST immediately on undervoltage detection and holds RST active for 100–300 ms (typ. 150 ms) after VCC returns within specification.

Its CMOS push-pull output eliminates external pull-up resistors, supports direct interface to microcontroller reset inputs, and operates across full VCC range (1.2 V to 5.5 V) with low quiescent current (30–40 µA). The device requires no external components for basic reset generation.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package with 1.3 mm × 2.9 mm footprint, lead-free and RoHS-compliant. Pinout validated per Maxim DS1812 datasheet Rev. 0, Figure 1 (CMOS Output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G15DBVR and MAX6326UT29D3+, the DS1812R-15/T&R delivers a factory-trimmed 4.13 V trip point optimized for 5 V systems, integrated push-pull output eliminating external components, and guaranteed 150 ms reset hold - making it a purpose-built solution for legacy and cost-sensitive industrial microcontroller reset management.

Availability

DS1812R-15/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter power sequencing, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for DS1812R-15/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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1812R-15/T&R belongs to the EconoReset™ family - engineered for low-cost, single-supply voltage monitoring with minimal external components in space-constrained embedded systems.

FAQ

What is the exact VCC trip point range for DS1812R-15/T&R?

The DS1812R-15/T&R has a guaranteed VCC trip point range of 4.00 V (minimum) to 4.24 V (maximum), with 4.13 V typical - corresponding to the "-15" suffix indicating ±15% tolerance around the nominal 4.13 V threshold. This specification is verified per Maxim's DS1812 datasheet AC/DC Electrical Characteristics table under "VCC Trip Point (DS1812-15)".

Does DS1812R-15/T&R require an external pull-up resistor on the RST pin?

No, DS1812R-15/T&R features a push-pull active-high output that drives RST directly without external components. Its output can source up to 350 µA at VCC – 0.5 V and sink up to 10 mA at 0.4 V, enabling direct connection to standard microcontroller reset inputs - a key advantage over open-drain alternatives like MAX6326.

What is the reset timeout duration for DS1812R-15/T&R after VCC recovery?

The DS1812R-15/T&R holds RST active for 100–300 ms after VCC returns to tolerance, with 150 ms typical. This parameter is specified as "RESET Active Time (tRST)" in the datasheet's AC Electrical Characteristics table and ensures sufficient stabilization time for both power supply and microprocessor before release.

Is DS1812R-15/T&R compatible with 3.3 V systems?

DS1812R-15/T&R is designed for 5 V systems with a 4.00–4.24 V trip point and is not recommended for 3.3 V rails. For 3.3 V monitoring, consider DS1812 variants with lower trip points (e.g., DS1812-10 at 4.25–4.49 V) or alternative devices like MAX6326 series with 3.08 V thresholds - DS1812R-15/T&R will assert reset prematurely on 3.3 V supplies.

What package type does DS1812R-15/T&R use, and is it RoHS-compliant?

DS1812R-15/T&R is supplied in the SOT-23-3 surface-mount package (1.3 mm × 2.9 mm), tape-and-reel format (T&R), and is RoHS-compliant and lead-free per Maxim's packaging specifications. Mechanical drawings confirm pin 1 = RST, pin 2 = VCC, pin 3 = GND - identical to TO-92 pinout orientation.