Analog Devices Inc./Maxim Integrated DS1814CR-10+T&R

Overview

DS1814CR-10+T&R from Maxim Integrated is a 5V microprocessor supervisory circuit with active-low reset output, 4.25V–4.50V VCC trip point (±10% tolerance), 140ms minimum reset pulse width, watchdog timer (1.12s timeout), and pushbutton reset debounce. It monitors power supply integrity, software execution via strobe input, and external manual reset in embedded control systems.

For engineers reviewing the DS1814CR-10+T&R datasheet, DS1814CR-10+T&R pinout, DS1814CR-10+T&R application, or DS1814CR-10+T&R equivalent, key selection criteria include reset threshold accuracy, watchdog timeout stability, pushbutton debouncing behavior, SOT-23-5 footprint compatibility, and industrial temperature operation (-40°C to +85°C).

Technical Context

The DS1814CR-10+T&R implements a precision voltage monitor with 10% trip tolerance at 4.25V–4.50V, internal hysteresis of 10mV, and reset assertion down to 1.0V VCC. Its push-pull RST output drives up to 3.2mA sink current at 0.4V and maintains valid logic levels during power-up and power-down transitions.

It integrates three core functions: power-fail detection with 140ms minimum reset hold time, 1.12s watchdog timer requiring ST input toggling, and hardware-debounced PBRST input generating ≥140ms active-low reset pulses on button release. The 'C' variant confirms pin 3 = RST (active-high) and pin 4 = PBRST (active-low), per device-type mapping.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package (2.9mm × 1.6mm × 1.1mm), lead-free and RoHS-compliant, optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX823SESA+ and TPS3808G12DBVR, the DS1814CR-10+T&R uniquely integrates pushbutton reset, watchdog timer, and dual-reset outputs in a single SOT-23-5 package-reducing BOM count and eliminating layout compromises for compact, self-contained supervision.

Availability

DS1814CR-10+T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, medical diagnostics, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for DS1814CR-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, medical, and communications applications.

The DS1814CR-10+T&R belongs to the MicroMonitor™ family-engineered specifically for robust, single-chip microprocessor supervision in harsh environments where reliability, timing accuracy, and integration density are critical.

FAQ

What is the exact VCC trip voltage range for DS1814CR-10+T&R?

The DS1814CR-10+T&R has a guaranteed VCC trip point of 4.25V to 4.50V at 25°C, with ±10% tolerance over temperature and supply variations. This range ensures reset assertion before 5V systems enter unstable operating regions, and the 10mV hysteresis prevents chatter near the threshold. The DS1814CR-10+T&R specification is validated per Maxim's DS1814 datasheet Rev. 0, page 6.

Does DS1814CR-10+T&R support both active-low and active-high reset outputs simultaneously?

Yes, the DS1814CR-10+T&R provides concurrent active-low RST (Pin 1) and active-high RST (Pin 3) outputs. This dual-output architecture allows direct connection to microcontrollers requiring either polarity without level-shifting. The DS1814CR-10+T&R 'C' variant explicitly assigns Pin 3 as RST per its device-type mapping in the official datasheet.

Can the watchdog timer in DS1814CR-10+T&R be disabled without modifying the PCB?

Yes, the watchdog timer in DS1814CR-10+T&R is disabled by leaving the ST (strobe) input pin unconnected (floating) or tri-stated. No external components or solder bridges are required. This feature allows reuse of the same DS1814CR-10+T&R footprint across designs with and without watchdog functionality.

What is the minimum VCC level at which DS1814CR-10+T&R maintains valid RST output logic levels?

The DS1814CR-10+T&R maintains valid RST output down to 1.0V VCC using its internal push-pull driver. Below 1.0V, a 100kΩ pull-down resistor from RST to GND extends valid reset assertion to 0V VCC-critical for fail-safe shutdown in deep brownout scenarios. This behavior is specified in the DS1814CR-10+T&R datasheet section "Output Valid Conditions".

Is DS1814CR-10+T&R pin-compatible with MAX823-series supervisory circuits?

Yes, the DS1814CR-10+T&R is pin- and function-compatible with the MAX823/24/25 family per Maxim's documentation. Both share identical SOT-23-5 pinout, reset timing, and functional blocks. However, DS1814CR-10+T&R adds PBRST support (absent in MAX823SESA+) and uses a different trip voltage-confirming compatibility requires verifying trip point alignment with target system requirements.