Analog Devices Inc./Maxim Integrated DS1830A+

Overview

DS1830A+ from Maxim Integrated is a 3.3V triple-output reset sequencer IC that monitors VCC for out-of-tolerance conditions and generates time-sequenced active-low reset signals (RST1, RST2, RST3) with programmable delays up to 500 ms. It features pushbutton reset input (PBRST), tolerance-select input (TOL), and time-delay select input (TD), operating across –40°C to +85°C in 8-pin DIP packaging. Used in multi-rail power-up sequencing for FPGA, microcontroller, and DSP systems.

For engineers reviewing the DS1830A+ datasheet, DS1830A+ pinout, DS1830A+ application, or DS1830A+ equivalent, key selection considerations include its 3.3V trip point range (2.47–3.15 V depending on TOL setting), cascaded reset timing ratios (1×/5×/10×), open-drain outputs rated for 20 mA sink, and support for manual override via debounced PBRST with internal 40 kΩ pull-up.

Technical Context

The DS1830A+ implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations, generating an internal power-fail signal that triggers sequenced reset assertion. Its TD input selects three discrete delay modes (10/20/50 ms for RST1), with RST2 and RST3 automatically scaled at fixed 5× and 10× multiples.

TOL input configures VCC trip thresholds-2.98–3.15 V (TOL = VCC), 2.80–2.97 V (TOL = GND), or 2.47–2.64 V (TOL = open)-sampled only during power-up before VCC exceeds the lowest trip point. PBRST initiates manual reset with ≥1 ms low pulse, debounced internally and pulled high via 40 kΩ.

Key Specifications

Pinout & Package

DS1830A+ 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 counter-clockwise 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 MAX6816EPA+ and TPS3808G33DBVR, the DS1830A+ uniquely delivers three precisely ratioed reset outputs with user-selectable trip points and delay bases-making it the only option among the three capable of autonomous, component-free power-up sequencing for 3.3V-based multi-rail systems.

Availability

DS1830A+ is available at Aetrix Electronics and suitable for industrial automation, medical imaging electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for DS1830A+ 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, automotive, and communications applications.

The DS1830A+ belongs to Maxim's power-supervisory product line, engineered specifically for deterministic, multi-rail power-up sequencing in 3.3V systems where reliability and timing accuracy are critical.

FAQ

What is the VCC trip voltage range for DS1830A+ under different TOL settings?

The DS1830A+ offers three VCC trip point ranges based on the TOL pin state: 2.98–3.15 V (TOL = VCC), 2.80–2.97 V (TOL = GND), and 2.47–2.64 V (TOL = open). These values are specified across –40°C to +85°C and reflect guaranteed min/max thresholds-not typical values-ensuring robust operation across temperature and process variation. DS1830A+ uses an internal temperature-compensated reference to maintain stability across this range.

How does the TD pin affect reset timing in DS1830A+?

The TD pin configures the base delay for RST1: 10 ms (TD = GND), 20 ms (TD = floating), or 50 ms (TD = VCC). RST2 and RST3 are then automatically set to 5× and 10× that base delay respectively. This fixed ratio architecture eliminates external timing components and guarantees consistent sequencing across voltage and temperature. DS1830A+ implements this using an internal oscillator and clock divider chain, not RC-based timing.

Can DS1830A+ be used in a cascaded configuration with another DS1830A+?

Yes, DS1830A+ supports cascade configurations where RST3 of a master device drives PBRST of a slave device. To ensure correct ripple-through behavior, the master's VCCTP must be set higher than the slave's (e.g., master TOL = VCC, slave TOL = GND). This ensures the master detects undervoltage first and triggers the slave's manual reset before its own supply fails. DS1830A+'s internal 40 kΩ PBRST pull-up allows direct connection without external resistors.

What is the maximum sink current capability of DS1830A+ reset outputs?

Each DS1830A+ reset output (RST1, RST2, RST3) is an open-drain driver rated for 20 mA sink current at 0.4 V. This allows direct interfacing with standard TTL/CMOS inputs and supports wired-OR configurations with multiple supervisors. The 20 mA rating is guaranteed across –40°C to +85°C and ensures reliable low-level assertion even under heavy capacitive loading or long PCB traces. DS1830A+ does not specify source current capability, as outputs are strictly open-drain.

Does DS1830A+ require external components for basic operation?

No, DS1830A+ requires no external components for core functionality: the internal 40 kΩ pull-up on PBRST, temperature-compensated reference, and oscillator eliminate need for RC networks, external references, or debounce circuitry. Only external pull-up resistors on RST1–RST3 are required (typically 4.7–10 kΩ to VCC) to establish high-level logic states. DS1830A+ is designed for minimal BOM count while maintaining full configurability via TD and TOL pins.