Analog Devices Inc./Maxim Integrated DS1830

Overview

DS1830 from Maxim Integrated is a 5V precision reset sequencer IC that monitors VCC for out-of-tolerance conditions and generates three time-sequenced, open-drain active-low reset outputs (RST1, RST2, RST3) with programmable delays up to 500ms. It features pushbutton reset override, selectable VCC tolerance (5%/10%/15%), and operates from -40°C to +85°C in 8-pin DIP packaging. Used in multi-rail power-up sequencing for microcontroller-based industrial control systems.

For engineers reviewing the DS1830 datasheet, DS1830 pinout, DS1830 application, or DS1830 equivalent, key selection criteria include its triple-reset timing hierarchy (RST1→RST2→RST3), TD-selectable delay options (10/20/50ms base), TOL-configurable trip points (4.00–4.74V), and compatibility with 5V logic supply rails and manual reset integration.

Technical Context

The DS1830 implements a precision voltage reference and comparator architecture to detect VCC deviations, triggering a deterministic reset sequence where RST1 releases first, followed by RST2 after 5× the RST1 delay, then RST3 after 10×. Its internal oscillator governs all timing, ensuring consistent delay ratios across temperature and supply.

Reset initiation is dual-triggered: automatic on VCC undervoltage (with trip point set by TOL input state) or manual via PBRST pin pulled low ≥1ms. The TD input selects one of three fixed timing profiles, and the TOL input configures trip thresholds before VCC rises above the lowest threshold-latching the setting at power-up.

Key Specifications

Pinout & Package

DS1830 is housed in an 8-pin DIP (300-mil) package with through-hole mounting and standard 0.3" row spacing. Pin 1 is marked with a notch or dot; pin numbering follows counterclockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar reset sequencer applications.

Compared with MAX6816 and TPS3808G33, the DS1830 uniquely delivers deterministic three-stage reset timing with user-selectable trip points and delay bases-making it irreplaceable in systems requiring hardware-governed power-up order across multiple voltage domains.

Availability

DS1830 is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, automotive infotainment head units, and FPGA-based embedded systems requiring stable component supply and long-term lifecycle support.

Supply support for DS1830 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management solutions for industrial, medical, and communications applications.

The DS1830 belongs to Maxim's power-supply supervision product line, designed specifically to replace discrete reset circuits in multi-rail embedded systems requiring deterministic, hardware-controlled boot sequencing.

FAQ

What is the function of the TOL pin on the DS1830?

The TOL pin on the DS1830 selects the VCC trip-point tolerance: tied to VCC yields ±5%, to GND yields ±10%, and left open yields ±15%. This setting is sampled only while VCC is below the lowest trip threshold and latched at power-up. The DS1830 uses this to configure its internal comparator reference, ensuring accurate reset assertion across varying supply stability requirements without external components.

How does the DS1830 generate its three reset outputs with different timing delays?

The DS1830 uses a single internal oscillator and clock chain to derive all reset timing. RST1 delay is set by the TD pin state (10/20/50ms min), and RST2 and RST3 are fixed multiples: RST2 = 5× RST1, RST3 = 10× RST1. This ratio-based architecture guarantees consistent sequencing regardless of temperature or supply variation. The DS1830 maintains this timing hierarchy even during power transients or pushbutton-initiated resets.

Can the DS1830 be used with a 3.3V supply?

No-the DS1830 is specified for 5V operation only, with VCC trip points ranging from 4.00V to 4.74V. For 3.3V systems, the pin-compatible DS1830A variant must be used, which has corresponding trip points of 2.47V to 3.15V. Substituting DS1830 in a 3.3V design will result in continuous reset assertion because VCC remains below the minimum trip threshold.

What is the maximum sink current capability of each DS1830 reset output?

Each DS1830 reset output (RST1, RST2, RST3) can sink up to 20mA when pulled low, measured at 0.4V. This allows direct driving of multiple CMOS inputs, pull-down resistors, or optocoupler LEDs without external buffers. The DS1830 maintains this drive strength across its full operating temperature range (-40°C to +85°C) and supply range (1.0V to 5.5V).

Is the DS1830 compatible with cascade configurations for extended reset timing?

Yes-the DS1830 supports cascade configurations where RST3 of a master device drives PBRST of a slave device, extending total reset hold time beyond 500ms. The DS1830 datasheet specifies that master and slave TOL pins must be configured so the master's VCCTP exceeds the slave's, ensuring ripple-through behavior during power-up. This capability is explicitly validated in Figure 4 and related notes.