Analog Devices Inc./Maxim Integrated DS1818-10

Overview

DS1818-10 from Maxim Integrated is a fixed-threshold, open-drain microprocessor supervisory circuit with pushbutton reset capability and temperature-compensated voltage monitoring. It provides active-low reset assertion at 2.80–2.97 V (10% tolerance), maintains reset for 150 ms after VCC recovery, draws ≤35 µA quiescent current, and supports -40°C to +85°C operation in TO-92 and SOT-23 packages. It is used in embedded systems requiring reliable power-fail detection and manual reset control.

For engineers reviewing the DS1818-10 datasheet, DS1818-10 pinout, DS1818-10 application, or DS1818-10 equivalent, key selection considerations include its 10% VCC trip point tolerance, 150 ms reset timeout, pushbutton-synchronized reset hold time, open-drain RST output with internal 5.5 kΩ pullup, and compatibility with 1.2–5.5 V supply rails.

Technical Context

The DS1818-10 implements a precision bandgap reference and comparator to detect VCC deviations beyond its factory-trimmed 10% threshold (2.80–2.97 V). Its internal timing circuit ensures reset remains asserted for 100–250 ms after VCC returns to tolerance-guaranteeing processor stabilization before release.

It supports dual reset initiation modes: automatic power-monitoring reset triggered by VCC drop below VCCTP, and manual pushbutton reset initiated by pulling RST low ≥1 µs, followed by 100–250 ms active-low hold after release. Both paths share the same open-drain output stage with internal 3.5–7.5 kΩ pullup.

Key Specifications

Pinout & Package

DS1818-10 is available in TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages. Both share identical pin functions and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G18DBVR, the DS1818-10 uniquely integrates pushbutton reset synchronization and fixed 10% tolerance at 2.88 V nominal-enabling simpler, lower-cost supervision in space-constrained 3.3 V systems without sacrificing reliability or timing control.

Availability

DS1818-10 is available at Aetrix Electronics and suitable for industrial automation, medical handheld devices, smart metering, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for DS1818-10 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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, computing, and consumer applications.

The DS1818-10 belongs to Maxim's EconoReset™ family of supervisory circuits, engineered for cost-sensitive, space-constrained embedded systems needing robust power monitoring and manual reset functionality without external components.

FAQ

What is the exact VCC trip point range for DS1818-10?

The DS1818-10 has a guaranteed VCC trip point range of 2.80 V to 2.97 V, corresponding to a 10% tolerance around the nominal 2.88 V threshold. This specification is tested and guaranteed over the full -40°C to +85°C operating temperature range and applies specifically to the DS1818-10 variant-not other members of the DS1818 family such as DS1818-5 or DS1818-20.

Does DS1818-10 require an external pull-up resistor on the RST pin?

No, DS1818-10 includes an internal pull-up resistor of 3.5–7.5 kΩ (typical 5.5 kΩ) on the open-drain RST output. An external pull-up is only necessary if the load capacitance or sink current exceeds the internal resistor's capability-typically when driving heavy capacitive loads (>50 pF) or multiple inputs. For standard microprocessor reset inputs, the internal pull-up suffices.

How does DS1818-10 handle pushbutton reset timing?

DS1818-10 detects any low pulse ≥1 µs on the RST pin-even while not in power-fail reset-and asserts active-low reset for 100–250 ms after the button is released. This ensures clean, bounce-free reset generation independent of press duration. The timing is internally generated and does not rely on external RC networks, making it immune to component aging or temperature drift.

Can DS1818-10 operate from a 1.8 V supply?

Yes, DS1818-10 supports supply voltages from 1.2 V to 5.5 V. However, its 2.80–2.97 V trip point means it is intended for monitoring 3.3 V rails-not 1.8 V rails. When powered from 1.8 V, the device remains functional for supervision of higher-voltage domains (e.g., using a level-shifter or separate 3.3 V supply for VCC), but it cannot supervise the 1.8 V rail itself.

Is DS1818-10 pin-compatible with DS1818-5 or DS1818-20?

Yes, DS1818-10 shares identical pinout, package dimensions, and electrical interface with DS1818-5 and DS1818-20. The only difference is the factory-trimmed VCC trip point: 2.98–3.15 V (5%), 2.80–2.97 V (10%), or 2.47–2.64 V (20%). All variants use the same TO-92 and SOT-23 footprints and can be substituted at the board level without layout changes.