Analog Devices Inc./Maxim Integrated DS1811-15

Overview

DS1811-15 from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring reset IC designed for microprocessor supervision in 5V systems. It asserts an active-low reset signal when VCC drops below 4.00–4.24V, holds reset active for 100–300ms after VCC recovery, and features an open-drain output with internal 3.5–7.5kΩ pull-up resistor - used in embedded controllers, industrial PLCs, and battery-backed instrumentation.

For engineers reviewing the DS1811-15 datasheet, DS1811-15 pinout, DS1811-15 application, or DS1811-15 equivalent, key selection criteria include its guaranteed 4.13V typical trip point, 150ms nominal reset timeout, -40°C to +85°C operating range, open-drain RST output compatibility with 3.3V/5V logic, and dual TO-92/SOT-23 package availability.

Technical Context

The DS1811-15 implements a temperature-compensated bandgap voltage reference and comparator to detect VCC out-of-tolerance conditions with ±1.5% trip accuracy over temperature. Its internal timing circuit ensures reset remains asserted for ≥100ms after VCC crosses the rising threshold, independent of supply slew rate.

It delivers a true open-drain RST output capable of sinking ≥10mA at 0.4V, eliminating external pull-up requirements in most 5V microcontroller reset circuits. No external capacitors or resistors are needed for basic operation - only VCC, GND, and RST connections.

Key Specifications

Pinout & Package

DS1811-15 is available in TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages - both share identical pin mapping and functional assignment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-monitoring reset applications.

Compared with MAX6326–41D and TPS3808G15, the DS1811-15 offers unique integration of internal pull-up, dual-package availability, and guaranteed 150ms reset hold - making it optimal for cost-sensitive, space-constrained 5V microcontroller reset where design simplicity and legacy footprint compatibility are priorities.

Availability

DS1811-15 is available at Aetrix Electronics and suitable for industrial automation, point-of-sale terminals, and smart metering applications requiring stable component supply, long-term lifecycle support, and consistent electrical performance across production batches.

Supply support for DS1811-15 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

Analog Devices (via acquisition of Maxim Integrated) designs high-performance analog, mixed-signal, and power management ICs for precision sensing, power integrity, and real-time control systems.

The DS1811-15 belongs to Maxim's EconoReset™ family - engineered specifically for cost-effective, single-supply microprocessor supervision in industrial and consumer electronics where reliability, small size, and minimal external components are essential.

FAQ

What is the exact VCC trip voltage range for DS1811-15?

The DS1811-15 has a guaranteed VCC trip point of 4.00V (minimum) to 4.24V (maximum), with 4.13V typical at 25°C. This range is specified across the full -40°C to +85°C operating temperature and ensures robust brownout detection in 5V systems without external trimming. The DS1811-15 uses a precision temperature-compensated reference to maintain this accuracy.

Does DS1811-15 require an external pull-up resistor on the RST pin?

No, DS1811-15 includes an internal pull-up resistor of 3.5–7.5kΩ, optimized for direct connection to standard 5V microcontroller reset inputs. External pull-up is unnecessary in most implementations - though a 1kΩ resistor may be added per Note 3 in specific high-noise or fast-slew-rate scenarios. The DS1811-15's open-drain architecture ensures compatibility with mixed-voltage systems.

Can DS1811-15 be used with 3.3V microcontrollers?

Yes, DS1811-15's open-drain RST output is fully compatible with 3.3V logic inputs. Its sink capability (≥10mA at 0.4V) ensures reliable low-state drive into 3.3V reset pins, and the internal pull-up naturally biases RST to 3.3V when pulled up externally - or to VCC if VCC = 3.3V. The DS1811-15 itself can operate down to 1.2V, supporting flexible rail monitoring.

How long does DS1811-15 hold reset active after VCC recovers?

DS1811-15 holds the RST output active for 100–300ms after VCC rises above the trip threshold, with 150ms typical. This guaranteed minimum hold time allows power supplies and microprocessors to stabilize fully before releasing reset - satisfying common µC requirements such as those in ARM Cortex-M and Renesas RL78 families. The DS1811-15 achieves this without external timing components.

Is DS1811-15 available in both TO-92 and SOT-23 packages?

Yes, DS1811-15 is offered in both TO-92 (through-hole) and SOT-23 (surface-mount) packages, with identical pinout (RST–VCC–GND) and electrical specifications. The TO-92 variant supports prototyping and legacy board upgrades, while SOT-23 enables high-density PCB layouts. Both packages are fully interchangeable at the circuit level - the DS1811-15's functionality and timing remain unchanged across variants.