Analog Devices Inc./Maxim Integrated DS1813-15+T

Overview

DS1813-15+T from Maxim Integrated is a precision voltage-monitoring reset IC with pushbutton override capability, designed for microprocessor power-supply supervision. It asserts an active-low reset signal when VCC drops below 4.00–4.24V (trip point), holds reset for 100–300ms after power recovery, and responds to manual button press with 150ms typical reset pulse. Used in embedded controllers requiring reliable cold-start and user-initiated reset.

For engineers reviewing the DS1813-15+T datasheet, DS1813-15+T pinout, DS1813-15+T application, or DS1813-15+T equivalent, key selection considerations include its fixed 4.13V nominal trip point, open-drain RST output with internal 5.5kΩ pullup, 150ms reset timeout, -40°C to +85°C operation, and SOT-23/TO-92 package compatibility.

Technical Context

The DS1813-15+T integrates a temperature-compensated voltage reference and comparator to detect VCC deviations against a factory-trimmed 4.13V threshold. Its dual-mode operation supports both power-fail detection (tRPD ≤ 5µs response) and pushbutton-triggered reset (tPB = 1µs detection latency).

Reset assertion is latched and held for 100–300ms (tRST/tPBRST) via internal timing circuitry independent of external components. The open-drain RST output drives low during reset and relies on its internal 3.5–7.5kΩ pullup resistor for high-state termination, eliminating need for external biasing.

Key Specifications

Pinout & Package

DS1813-15+T is available in SOT-23 (3-pin) and TO-92 packages. Both share identical pin mapping: Pin 1 = RST (active-low open-drain reset output), Pin 2 = VCC (power supply input), Pin 3 = GND (ground reference).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–41D and TPS3808G15, DS1813-15+T uniquely combines factory-trimmed 15% tolerance, integrated pushbutton handling, and internal pullup in a 3-pin SOT-23-making it optimal for cost-sensitive, space-constrained designs needing both power and manual reset supervision without external components.

Availability

DS1813-15+T is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, and medical handheld diagnostics requiring stable component supply and long-term manufacturability.

Supply support for DS1813-15+T 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 and mixed-signal ICs for industrial, communications, and computing applications.

The DS1813-15+T belongs to Maxim's EconoReset family-engineered for low-cost, minimal-footprint power-supply monitoring in resource-constrained embedded systems where reliability and simplicity are prioritized over programmability.

FAQ

What is the exact VCC trip point range for DS1813-15+T?

The DS1813-15+T has a guaranteed VCC trip point range of 4.00V to 4.24V, with a nominal value of 4.13V. This 15% tolerance (denoted by "-15" in the part number) is factory-trimmed and temperature-compensated, ensuring consistent brown-out detection across -40°C to +85°C without external calibration. DS1813-15+T maintains this specification under all recommended operating conditions.

Does DS1813-15+T require an external pullup resistor on the RST pin?

No, DS1813-15+T includes an internal pullup resistor of 3.5–7.5kΩ (typical 5.5kΩ) on the open-drain RST output. This eliminates the need for an external pullup in standard 5V systems, reducing BOM count and PCB area. DS1813-15+T's RST pin drives low during reset and floats high otherwise, relying solely on its internal resistor for logic-high termination.

How does DS1813-15+T handle pushbutton reset timing?

DS1813-15+T detects a pushbutton press when the RST pin is pulled low for ≥1µs, then holds the reset output low for 100–300ms (typically 150ms) after the button is released. This built-in timing prevents contact bounce from causing multiple resets and ensures a clean, deterministic reset pulse. DS1813-15+T performs this function autonomously without external timing components.

Can DS1813-15+T operate from a 3.3V supply?

Yes, DS1813-15+T operates from VCC = 1.2V to 5.5V, so it functions correctly at 3.3V. However, its 4.00–4.24V trip point means it will assert reset continuously when powered from 3.3V, as VCC remains below threshold. DS1813-15+T is intended for 5V systems; for 3.3V supervision, a different variant (e.g., DS1813-33) or alternative IC is required.

What package options are available for DS1813-15+T?

DS1813-15+T is offered in both SOT-23 (surface-mount) and TO-92 (through-hole) packages, with identical 3-pin configuration: Pin 1 = RST, Pin 2 = VCC, Pin 3 = GND. The "+T" suffix denotes tape-and-reel packaging for automated assembly. DS1813-15+T's pinout and electrical behavior are fully interchangeable between these two packages.