Analog Devices Inc./Maxim Integrated DS1830S

Overview

DS1830S 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. It features pushbutton reset override, selectable VCC tolerance (5%/10%/15%), and operates from -40°C to +85°C in 8-pin SO package.

For engineers reviewing the DS1830S datasheet, DS1830S pinout, DS1830S application, or DS1830S equivalent, key selection criteria include its triple-reset sequencing timing (10/50/100 ms min), VCC trip point accuracy (4.50–4.74 V at TOL=VCC), tolerance select input (TOL), time delay control (TD), and compatibility with power-up stabilization in multi-rail embedded systems.

Technical Context

The DS1830S implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations, generating an internal power-fail signal that forces all reset outputs active. Its sequenced release-RST1 first, then RST2 after 5× RST1 delay, then RST3 after 10× RST1 delay-is controlled by the TD pin state (GND/N.C./VCC).

Reset timing is oscillator-based and deterministic: TD = GND yields tRST1 ≥10 ms, tRST2 ≥50 ms, tRST3 ≥100 ms; TOL selects VCC trip point (4.00–4.74 V); PBRST accepts ≥1 ms low pulse with internal 40 kΩ pull-up and debouncing.

Key Specifications

Pinout & Package

DS1830S is housed in an 8-pin SOIC (150-mil width) package with gull-wing leads, JEDEC MS-012AC compliant, footprint compatible with industry-standard 8-SO footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816 and TPS3808G33, the DS1830S uniquely integrates VCC supervision, triple-sequenced outputs, and configurable trip/timing-making it irreplaceable in systems requiring coordinated power-up of heterogeneous subsystems without added logic or layout complexity.

Availability

DS1830S is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic imaging systems, automotive infotainment head units, and telecom base station management cards requiring stable component supply and long-term lifecycle support.

Supply support for DS1830S 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, medical, and communications applications.

The DS1830S belongs to Maxim's reset supervisor and sequencer product line, engineered specifically for reliable, deterministic power-up sequencing in multi-voltage embedded systems with strict timing dependencies.

FAQ

What is the VCC trip point range for DS1830S when TOL is tied to VCC?

The DS1830S has a VCC trip point range of 4.50 V to 4.74 V when the TOL pin is connected to VCC, corresponding to a 5% tolerance setting for 5V rail monitoring. This specification is guaranteed over the full operating temperature range (-40°C to +85°C) and is derived from the DS1830/A datasheet Table on DC Electrical Characteristics. The DS1830S maintains this trip point accuracy using an internal precision temperature-compensated voltage reference.

How does the TD pin affect reset timing in DS1830S?

The TD pin on the DS1830S selects one of three minimum reset timing profiles: TD = GND yields RST1 ≥10 ms, TD = N.C. yields RST1 ≥20 ms, and TD = VCC yields RST1 ≥50 ms. RST2 and RST3 follow with fixed 5× and 10× multiples respectively. These delays are oscillator-based and deterministic, not RC-dependent. The DS1830S samples TD only during initial power-up before VCC exceeds the lowest trip threshold, ensuring timing configuration is locked at startup.

Can DS1830S be used with a 3.3V supply rail?

No, the DS1830S is specified exclusively for 5V operation and monitoring. Its VCC trip points (4.00–4.74 V) and recommended operating conditions (VCC = 1.0 V to 5.5 V) are optimized for 5V systems. For 3.3V applications, the pin-compatible DS1830AS variant must be used, which features trip points of 2.47–3.15 V and identical sequencing functionality. Using DS1830S on a 3.3V rail would result in continuous reset assertion due to undervoltage detection.

What is the function of the TOL pin on DS1830S?

The TOL pin on the DS1830S selects the VCC trip point hysteresis: TOL = VCC sets 5% tolerance (4.50–4.74 V), TOL = GND sets 10% (4.25–4.49 V), and TOL = open sets 15% (4.00–4.24 V). This pin is sampled only once during power-up while VCC remains below the lowest trip threshold, after which its state is latched. The DS1830S uses this setting to configure comparator thresholds within its internal precision reference circuit, enabling application-specific rail stability margins without external components.

Does DS1830S support pushbutton reset with hardware debouncing?

Yes, the DS1830S includes integrated hardware debouncing for the PBRST pin. It features an internal 40 kΩ pull-up resistor and digital debounce circuitry that rejects glitches shorter than 1 ms. A valid pushbutton reset requires holding PBRST low for ≥1 ms, after which the DS1830S initiates the full sequenced reset cycle. This eliminates the need for external RC filters or firmware-based debouncing, simplifying system design and improving reliability in noisy environments.