Analog Devices Inc./Maxim Integrated DS1830U+T&R

Overview

DS1830U+T&R from Maxim Integrated is a 5V 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 (10/20/50 ms min for RST1), pushbutton override input (PBRST), and selectable VCC trip tolerance (4.00–4.74 V). It enables orderly power-up in multi-rail embedded systems such as industrial controllers and telecom line cards.

For engineers reviewing the DS1830U+T&R datasheet, DS1830U+T&R pinout, DS1830U+T&R application, or DS1830U+T&R equivalent, key selection considerations include its 8-pin µSOP package, -40°C to +85°C operating range, open-drain reset outputs capable of 20mA sink, precision temperature-compensated voltage reference, and TD/TOL pin-configurable timing and trip thresholds.

Technical Context

The DS1830U+T&R implements a hierarchical reset sequencing architecture: upon VCC entering tolerance, RST1 releases first after a TD-selectable delay (10/20/50 ms), followed by RST2 at 5× that delay, then RST3 at 10×. Its internal comparator uses a precision temperature-compensated reference to detect VCC deviations with ±0.12 V trip accuracy across temperature.

Reset assertion is triggered by either VCC dropout below the TOL-selected threshold (4.00–4.74 V for DS1830 variants) or a ≥1ms low pulse on PBRST - which is internally pulled up to VCC via 40kΩ and debounced. All three reset outputs are open-drain, active-low, and rated for 20mA sink current at 0.4V.

Key Specifications

Pinout & Package

DS1830U+T&R is housed in an 8-pin µSOP (118-mil width) package, surface-mount, lead-free, RoHS-compliant, with exposed pad for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816ESE+ and TPS3808G18DBVR, the DS1830U+T&R uniquely integrates VCC monitoring, triple sequenced outputs, and pin-selectable timing/tolerance - making it irreplaceable in multi-rail systems requiring deterministic, configurable power-up coordination.

Availability

DS1830U+T&R is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, embedded controllers, and medical diagnostic equipment requiring stable component supply and long-term production continuity.

Supply support for DS1830U+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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1830U+T&R belongs to Maxim's supervisory IC product line, engineered specifically for reliable, configurable power-up sequencing in multi-voltage embedded systems where deterministic reset timing and supply margining are critical.

FAQ

What is the function of the TD pin on the DS1830U+T&R?

The TD pin on the DS1830U+T&R selects the base delay for RST1: grounded = 10 ms min, floating = 20 ms min, tied to VCC = 50 ms min. RST2 and RST3 delays scale as 5× and 10× that value respectively. This allows one DS1830U+T&R variant to serve multiple timing requirements without redesigning the PCB layout or changing bill-of-materials.

How does the TOL pin affect the DS1830U+T&R's reset threshold?

The TOL pin configures the DS1830U+T&R's VCC trip point: grounded sets 4.25–4.49 V, open sets 4.00–4.24 V, and tied to VCC sets 4.50–4.74 V. This selection occurs only during power-up before VCC exceeds the lowest trip value, enabling precise matching to the tolerance of the target 5V regulator without external resistors.

Can the DS1830U+T&R be used with a 3.3V supply?

No - the DS1830U+T&R is the 5V-specific variant (DS1830 series). For 3.3V systems, use DS1830AU+T&R, which has trip thresholds of 2.47–3.15 V depending on TOL setting. The DS1830U+T&R's specified VCCTP range starts at 4.00 V and is not guaranteed to operate correctly below 4.0 V.

What is the maximum sink current capability of each reset output on the DS1830U+T&R?

Each reset output (RST1, RST2, RST3) on the DS1830U+T&R can sink up to 20 mA while maintaining ≤0.4 V at the output pin. This is sufficient to directly drive standard CMOS and TTL reset inputs without external pull-up resistors or buffer stages.

Is the DS1830U+T&R compatible with the DS1830S and DS1830 DIP packages?

Yes - the DS1830U+T&R shares identical electrical specifications, pinout, and functional behavior with DS1830S (SO-8) and DS1830 (DIP-8), differing only in package type (8-pin µSOP). All three are drop-in replacements at the schematic and firmware level, allowing design reuse across prototyping (DIP), small-volume (SO), and space-constrained (µSOP) implementations.