Analog Devices Inc./Maxim Integrated DS1818-10/T&R

Overview

DS1818-10/T&R from Maxim Integrated is a 3.3V fixed-threshold supervisory IC with pushbutton reset capability, active-low open-drain reset output, 150ms reset timeout, and ±10% trip point tolerance (2.80V–2.97V). It monitors VCC for power-fail detection and provides manual reset via external pushbutton in microprocessor-based embedded systems.

For engineers reviewing the DS1818-10/T&R datasheet, DS1818-10/T&R pinout, DS1818-10/T&R application, or DS1818-10/T&R equivalent, key selection considerations include reset threshold accuracy, guaranteed 150ms reset assertion time after power-up/power-down, pushbutton debounced reset timing, quiescent current under 35µA, and compatibility with SOT-23 and TO-92 packages.

Technical Context

The DS1818-10/T&R implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations beyond its ±10% threshold window (2.80V–2.97V at 3.3V nominal). Its internal logic asserts RST low within 5µs of out-of-tolerance detection and holds it active for 100–250ms (typ. 150ms) during power-up, power-down, and pushbutton release events.

It features an integrated 5.5kΩ pullup resistor on the open-drain RST output, eliminating external components while supporting 10mA sink capability at 0.4V. The device operates across 1.0V–5.5V supply range and supports manual reset initiation by pulling RST low for ≥1µs, followed by 150ms reset hold time after release.

Key Specifications

Pinout & Package

DS1818-10/T&R is supplied in tape-and-reel format and available in both SOT-23 and TO-92 packages. The T&R designation indicates standard packaging for automated assembly; pinout is identical across both variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory IC applications.

Compared with MAX809TRD2+T and TPS3808G18DBVR, the DS1818-10/T&R uniquely integrates pushbutton reset timing and ±10% fixed 3.3V supervision in a single low-quiescent-current package-ideal for cost-sensitive, space-constrained industrial and metering designs requiring both automatic and manual reset paths.

Availability

DS1818-10/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering endpoints, and medical handheld diagnostics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for DS1818-10/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, communications, and computing applications.

The DS1818-10/T&R belongs to Maxim's EconoReset™ family of supervisory ICs, engineered for cost-effective, low-power microprocessor reset and power-fail detection in resource-constrained embedded systems.

FAQ

What is the exact reset threshold voltage range for DS1818-10/T&R?

The DS1818-10/T&R has a guaranteed reset threshold range of 2.80V to 2.97V at 25°C, corresponding to ±10% of a nominal 3.3V supply. This tolerance is maintained across the full -40°C to +85°C operating temperature range due to its internal temperature-compensated reference circuit. The DS1818-10/T&R does not require external calibration to meet this specification.

Does DS1818-10/T&R require an external pullup resistor on the RST pin?

No, the DS1818-10/T&R includes an internal 5.5kΩ pullup resistor on its open-drain RST output, eliminating the need for an external component in most applications. An external pullup may be added only if the load demands more than 10mA sink current or if system-level noise immunity requires stronger pullup strength-verified per DS1818-10/T&R's IOL rating of 10mA at 0.4V.

How does the pushbutton reset function work on DS1818-10/T&R?

The DS1818-10/T&R monitors its own RST pin for manual reset: pulling RST low for ≥1µs triggers a reset cycle, and the output remains low for 100–250ms (typically 150ms) after release. This built-in timing removes external RC networks. The DS1818-10/T&R detects the edge-not duration-so brief contact closures are reliably captured without bounce-related false triggers.

What package types are available for DS1818-10/T&R?

The DS1818-10/T&R is offered in both SOT-23 and TO-92 packages, with identical 3-pin pinout (RST-VCC-GND) and electrical specifications. The "/T&R" suffix denotes tape-and-reel packaging optimized for automated surface-mount assembly. Both packages operate identically across -40°C to +85°C and support the same 1.0V–5.5V VCC range.

Is DS1818-10/T&R compatible with 5V microcontrollers?

Yes, the DS1818-10/T&R supports VCC inputs from 1.0V to 5.5V and its RST output is rated for up to 5V + 0.5V (absolute max), making it safe for direct interface with 5V logic. Its 3.3V reset threshold remains valid regardless of VCC level-as long as VCC ≥ 1.0V-and the DS1818-10/T&R maintains full functionality and timing accuracy across this range.