Analog Devices Inc./Maxim Integrated DS1811-10/T&R

Overview

DS1811-10/T&R from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring supervisor IC with open-drain active-low reset output, designed for microprocessor power-fail detection and reset timing control. It features a 4.25V to 4.49V VCC trip point, 150 ms reset pulse width, internal 5.5 kΩ pull-up resistor, -40°C to +85°C operating range, and SOT-23/TO-92 packaging.

For engineers reviewing the DS1811-10/T&R datasheet, DS1811-10/T&R pinout, DS1811-10/T&R application, or DS1811-10/T&R equivalent, key selection considerations include its guaranteed reset hold time after power recovery, temperature-compensated trip threshold accuracy, open-drain drive capability, and compatibility with 5V microcontroller reset inputs requiring active-low assertion.

Technical Context

The DS1811-10/T&R implements a precision bandgap voltage reference and comparator-based monitoring circuit that continuously compares VCC against a factory-trimmed threshold (4.35V typ). Upon detecting an out-of-tolerance condition, it asserts RST low; upon return to tolerance, it holds RST active for 150 ms (min 100 ms, max 300 ms) to ensure system stabilization.

Its open-drain output supports wired-OR configurations and interfaces directly with microcontrollers requiring external pull-up or shared reset buses. The internal 5.5 kΩ pull-up eliminates need for discrete resistors in many designs, while low 30–40 µA quiescent current enables use in battery-backed or low-power systems.

Key Specifications

Pinout & Package

SOT-23-3 and TO-92 packages are both offered for DS1811-10/T&R; the /T&R suffix denotes tape-and-reel packaging for SOT-23-3. Pin functions are identical across packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1811-10/T&R, TPS3808G15DBVR targets lower-voltage domains and lacks integrated pull-up, while MAX6326UT46D3+ offers tighter trip tolerance and push-pull drive but sacrifices reset bus flexibility - making DS1811-10/T&R optimal for cost-sensitive, 5V microcontroller reset applications requiring guaranteed timing and minimal external components.

Availability

DS1811-10/T&R is available at Aetrix Electronics and suitable for industrial control panels, smart metering hardware, point-of-sale terminals, and network infrastructure equipment requiring stable component supply and long-term manufacturability.

Supply support for DS1811-10/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, automotive, communications, and computing applications.

The DS1811-10/T&R belongs to Maxim's EconoReset™ family of low-cost, single-supply voltage supervisors targeting cost-sensitive microprocessor reset applications where guaranteed timing and minimal external components are critical.

FAQ

What is the exact VCC trip voltage range for DS1811-10/T&R?

The DS1811-10/T&R has a factory-trimmed VCC trip point ranging from 4.25V (minimum) to 4.49V (maximum), with 4.35V typical. This 10% tolerance variant is specifically calibrated for reliable reset assertion in standard 5V systems before the supply falls below microcontroller operational limits, and is confirmed in the device's DC Electrical Characteristics table under VCCTP parameter.

Does DS1811-10/T&R require an external pull-up resistor on the RST pin?

No, DS1811-10/T&R includes an internal 5.5 kΩ pull-up resistor on the open-drain RST output, eliminating the need for an external component in most 5V microcontroller reset interfaces. This feature is explicitly documented in the DC Electrical Characteristics table and reduces BOM count and board space - though designers may add an external pull-up if interfacing with non-5V logic families or requiring faster rise times.

What is the guaranteed reset pulse width of DS1811-10/T&R after VCC recovery?

The DS1811-10/T&R guarantees a reset pulse width of 100 ms minimum to 300 ms maximum, with 150 ms typical, measured from the moment VCC returns to within tolerance until RST deasserts. This timing is specified in the AC Electrical Characteristics table as tRST and ensures sufficient stabilization time for microprocessors and associated power rails before release.

Can DS1811-10/T&R operate with supply voltages below 5V?

Yes, DS1811-10/T&R operates over a VCC range of 1.2V to 5.5V and maintains valid reset functionality down to 1.2V. However, its 4.25–4.49V trip point means it will assert reset whenever VCC falls below that window - so it is functionally intended for monitoring 5V rails. Operation at lower VCC (e.g., 3.3V) would cause immediate reset assertion and is not a supported use case per datasheet specifications.

Is DS1811-10/T&R pin-compatible with other DS181x series devices?

Yes, all DS181x series devices - including DS1811-5, DS1811-10, DS1811-15, and DS1812 variants - share identical SOT-23-3 and TO-92 pinouts (RST/VCC/GND), same electrical interface, and compatible timing behavior. Only the trip voltage differs between variants; therefore, DS1811-10/T&R can be substituted for other DS181x parts in the same package without layout changes, provided the 4.25–4.49V threshold meets system requirements.