Analog Devices Inc./Maxim Integrated DS1814AR-10/T&R

Overview

DS1814AR-10/T&R from Maxim Integrated is a 5V microprocessor supervisory IC 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 DS1814AR-10/T&R datasheet, DS1814AR-10/T&R pinout, DS1814AR-10/T&R application, or DS1814AR-10/T&R equivalent, key selection criteria include VCC trip point tolerance, watchdog timeout (1.12 s), pushbutton debounce behavior, reset output drive capability (3.2 mA sink), and compatibility with MAX823/24/25 series in space-constrained industrial control designs.

Technical Context

The DS1814AR-10/T&R implements a precision voltage monitor with 4.25–4.50 V trip threshold and 10 mV hysteresis, a 1.12 s watchdog timer triggered by ST input transitions, and a debounced PBRST input that generates ≥140 ms active-low reset pulses on button release. Its push-pull RST output remains valid down to 1.0 V VCC and supports 0 V operation with external pull-down.

It integrates three critical supervision functions-power-fail detection, software execution watchdog, and manual reset-in a single SOT-23-5 device. The 'A' variant (indicated by 'A' in part marking) includes both PBRST and ST pins, enabling full supervision without external components in microcontroller-based systems requiring robust power-up/power-down sequencing and fault recovery.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package (2.9 mm × 1.6 mm × 1.1 mm), thermally enhanced plastic body with gull-wing leads, compatible with standard reflow profiles and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX823SESA+ and TPS3808G12DBVR, the DS1814AR-10/T&R uniquely combines fixed ±10% 5 V supervision, hardware watchdog, and debounced pushbutton reset in one pin-compatible IC-enabling full supervision without design compromises or external circuitry.

Availability

DS1814AR-10/T&R is available at Aetrix Electronics and suitable for industrial automation, medical device, smart metering, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for DS1814AR-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 high-reliability industrial, medical, and communications systems.

The DS1814AR-10/T&R belongs to Maxim's MicroMonitor™ family-engineered specifically to replace discrete reset circuits in microcontroller-based systems where power integrity, firmware reliability, and manual recovery are mission-critical.

FAQ

What is the exact VCC trip voltage range for DS1814AR-10/T&R?

The DS1814AR-10/T&R has a guaranteed VCC trip point of 4.25 V minimum to 4.50 V maximum, corresponding to its ±10% tolerance specification for 5 V systems. This range is validated across –40°C to +85°C and ensures reliable reset assertion before most 5 V microcontrollers enter undefined operating regions. The DS1814AR-10/T&R uses an internal temperature-compensated reference to maintain this accuracy without external calibration.

Does DS1814AR-10/T&R support both active-low and active-high reset outputs?

No. The DS1814AR-10/T&R is the 'A' variant and provides only an active-low reset output (RST) on Pin 1. Unlike DS1814B or DS1814C variants, it does not include an active-high RST output. Its RST pin is push-pull and sinks up to 6 mA, making it compatible with standard microcontroller reset inputs requiring active-low assertion. The DS1814AR-10/T&R datasheet confirms this configuration in the pin assignment table.

Can the watchdog timer in DS1814AR-10/T&R be disabled, and how?

Yes, the watchdog timer in DS1814AR-10/T&R can be disabled by leaving the ST (strobe) input pin unconnected (floating) or tri-stated. When ST is not actively driven high or low, the internal watchdog circuit remains inactive and will not assert reset due to timeout. This behavior is explicitly documented in the DS1814AR-10/T&R operation section and enables flexible deployment-e.g., using the IC solely for power monitoring and pushbutton reset without watchdog intervention.

What is the minimum VCC level at which DS1814AR-10/T&R maintains valid RST output?

The DS1814AR-10/T&R maintains a valid logic-low or logic-high RST output down to 1.0 V VCC using its internal push-pull driver. Below 1.0 V, a 100 kΩ external pull-down resistor from RST to GND extends valid reset assertion to 0 V VCC-critical for detecting complete power collapse. This dual-mode operation is confirmed in the DS1814AR-10/T&R output valid conditions section and supports fail-safe shutdown in battery-depleted or rapidly collapsing supply scenarios.

Is DS1814AR-10/T&R pin-compatible with MAX823-series ICs?

Yes, DS1814AR-10/T&R is explicitly stated as pin- and function-compatible with MAX823/24/25 products in its official datasheet features list. All five pins-RST, GND, PBRST, ST, and VCC-map identically in SOT-23-5 package, and electrical characteristics (trip point, reset timing, drive strength) are aligned for direct substitution. This compatibility allows seamless migration or second-sourcing without PCB redesign, provided the target application requires the 'A' variant's combined supervision features.