Analog Devices Inc./Maxim Integrated DS1818R-10-U

Overview

DS1818R-10-U from Maxim Integrated is a 3.3V fixed-threshold supervisory IC with pushbutton reset capability, active-low open-drain reset output, 10% trip-point tolerance (2.80V–2.97V), and 150ms reset timeout-designed for microprocessor power-fail detection and stabilization in embedded control systems.

For engineers reviewing the DS1818R-10-U datasheet, DS1818R-10-U pinout, DS1818R-10-U application, or DS1818R-10-U equivalent, key selection factors include guaranteed 150ms reset assertion after VCC recovery, internal 5.5kΩ pullup resistor, 35µA max quiescent current, pushbutton debounce timing, and SOT-23/TO-92 package compatibility.

Technical Context

The DS1818R-10-U integrates a precision temperature-compensated voltage reference and comparator to monitor VCC against a fixed 3.3V threshold with ±10% tolerance. It asserts RST low on out-of-tolerance detection and holds it active for 100–250ms after VCC returns to spec.

Its dual-mode operation supports both power-up/power-down monitoring and manual reset via external pushbutton: pulling RST low for ≥1µs triggers a 100–250ms reset pulse upon release, independent of VCC state.

Key Specifications

Pinout & Package

SOT-23 and TO-92 packages are supported; DS1818R-10-U is marked and shipped in SOT-23-3 configuration per Maxim's standard ordering code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX809TRD3+T and TPS3808G18DBVR, the DS1818R-10-U uniquely combines fixed 3.3V supervision, ±10% tolerance, integrated pushbutton handling, and internal pullup-reducing component count in cost-sensitive industrial controllers.

Availability

DS1818R-10-U is available at Aetrix Electronics and suitable for industrial automation, smart metering, medical sensor nodes, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for DS1818R-10-U 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 DS1818R-10-U belongs to Maxim's EconoReset™ family of supervisory circuits-engineered to simplify power monitoring and reset control in cost-constrained embedded systems without sacrificing reliability.

FAQ

What is the exact reset threshold voltage range for DS1818R-10-U?

The DS1818R-10-U has a nominal 3.3V reset threshold with ±10% tolerance, resulting in a guaranteed trip point between 2.80V and 2.97V across -40°C to +85°C. This range is specified in the DC Electrical Characteristics table under VCCTP for DS1818-10, and applies directly to DS1818R-10-U as the "R" suffix denotes SOT-23 packaging and "-10" indicates 10% tolerance.

Does DS1818R-10-U require an external pull-up resistor on the RST pin?

No, DS1818R-10-U includes an internal pull-up resistor ranging from 3.5kΩ to 7.5kΩ, with a typical value of 5.5kΩ. This eliminates the need for an external pull-up in most applications, though a 1kΩ external resistor may be added if stronger drive capability is required for specific microprocessor reset inputs.

How does the pushbutton reset function work on DS1818R-10-U?

The DS1818R-10-U monitors its own RST pin: pulling it low for at least 1µs triggers a reset cycle, and the output remains low for 100–250ms after release. This behavior is fully self-contained-no external timing components or logic are needed-and operates independently of VCC status, making it ideal for field-service resets.

What is the maximum supply voltage and operating temperature range for DS1818R-10-U?

DS1818R-10-U supports a supply voltage range of 1.0V to 5.5V and operates over -40°C to +85°C. These limits are validated per the Absolute Maximum Ratings and Recommended DC Operating Conditions tables in the official datasheet, confirming suitability for industrial and automotive under-hood environments.

Is DS1818R-10-U pin-compatible with other DS1818 variants like DS1818R-5-U or DS1818R-20-U?

Yes, all DS1818R-x-U variants-including DS1818R-5-U, DS1818R-10-U, and DS1818R-20-U-share identical SOT-23-3 pinout, electrical interface, and timing behavior. Only the reset threshold tolerance differs (±5%, ±10%, ±20%), so they are direct replacements in layout and firmware, provided the selected tolerance meets system voltage margin requirements.