Analog Devices Inc./Maxim Integrated DS1814CR-10-U

Overview

DS1814CR-10-U from Maxim Integrated is a 5V microprocessor supervisory circuit with power monitoring, watchdog timer, and pushbutton reset functions. It provides active-low reset output (RST), monitors VCC with ±10% trip accuracy at 4.25–4.50 V, delivers 140–280 ms reset pulse width, and operates across –40°C to +85°C in SOT-23-5 package for embedded microcontroller power integrity.

For engineers reviewing the DS1814CR-10-U datasheet, DS1814CR-10-U pinout, DS1814CR-10-U application, or DS1814CR-10-U equivalent, key selection criteria include VCC trip point tolerance, reset timing consistency, watchdog timeout (1.12 s), pushbutton debounce behavior, and compatibility with MAX823/24/25-series designs.

Technical Context

The DS1814CR-10-U implements a precision voltage monitor with 4.25 V minimum trip point and 10 mV hysteresis, ensuring reliable power-fail detection during brownout conditions. Its internal watchdog timer requires ST input toggling every 1.12 seconds to prevent reset assertion, and it supports pushbutton reset debouncing with ≥140 ms active-low output pulse.

This variant belongs to the 'C' device type (RST, GND, RST, PBRST, VCC pinout) and 'R' tolerance grade (10%), delivering dual-reset outputs - one active-low and one active-high - enabling flexible interface with diverse microcontroller reset architectures without external logic.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package with 1.6 mm × 2.9 mm footprint, 0.95 mm height, and gull-wing leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX823SEUK+T and TPS3808G12DBVR, the DS1814CR-10-U uniquely integrates dual-reset outputs, hardware watchdog, and pushbutton reset in a 5-pin SOT-23, reducing BOM count and eliminating layout compromises for industrial 5 V microcontroller systems.

Availability

DS1814CR-10-U is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed parametric consistency.

Supply support for DS1814CR-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, automotive, communications, and computing applications.

The DS1814CR-10-U belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically to replace discrete reset solutions in 5 V microcontroller systems with guaranteed timing, voltage accuracy, and reliability.

FAQ

What is the exact VCC trip point range for DS1814CR-10-U?

The DS1814CR-10-U has a guaranteed VCC trip point range of 4.25 V to 4.50 V, corresponding to its ±10% tolerance specification relative to 5 V nominal supply. This range is validated across –40°C to +85°C and ensures consistent brownout detection without calibration. The DS1814CR-10-U uses an internal temperature-compensated reference to maintain trip accuracy over full operating temperature and supply conditions.

Does DS1814CR-10-U support both active-low and active-high reset outputs simultaneously?

Yes, the DS1814CR-10-U provides two independent reset outputs: Pin 1 (RST) is active-low and Pin 3 (RST) is active-high. This dual-output configuration is inherent to its 'C' device type and eliminates the need for external inverters when interfacing with microcontrollers that accept either reset polarity. The DS1814CR-10-U asserts both outputs synchronously during power failure, watchdog timeout, or pushbutton event.

Can the watchdog timer in DS1814CR-10-U be disabled, and how?

Yes, the watchdog timer in DS1814CR-10-U can be disabled by leaving the ST (strobe) input pin unconnected (floating) or tri-stated. When ST is inactive, the watchdog function remains dormant and will not assert reset due to timeout. This allows the DS1814CR-10-U to operate solely as a power monitor and pushbutton reset controller without requiring firmware modifications or additional circuitry.

What is the reset pulse width behavior of DS1814CR-10-U during power-up and pushbutton events?

The DS1814CR-10-U guarantees a minimum reset pulse width of 140 ms for all triggering conditions - including power-up, power-down, watchdog timeout, and pushbutton release. The actual pulse width ranges from 140 ms to 280 ms depending on VCC and temperature. For pushbutton use, the DS1814CR-10-U debounces the input and initiates the pulse upon button release, not press, preventing spurious resets from mechanical bounce.

Is DS1814CR-10-U pin-compatible with MAX823-series devices?

Yes, the DS1814CR-10-U is pin- and function-compatible with the MAX823/24/25 family per manufacturer documentation. It shares identical SOT-23-5 pinout, electrical timing, and functional behavior for power monitoring and reset generation. However, DS1814CR-10-U adds pushbutton reset support and dual-output capability not present in base MAX823 variants, making it a functional superset in compatible layouts.