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

Overview

DS1814AR-10+T&R 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 trip point at 4.25–4.50 V (10% tolerance), 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 accuracy (±10%), 1.12 s watchdog timeout, push-pull RST output valid down to 1.0 V VCC, and compatibility with MAX823/24/25 in industrial-grade microcontroller reset management.

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, enabling reliable reset assertion during brownout conditions.

It supports three functional variants: 'A' (RST, GND, PBRST, ST, VCC) matches DS1814AR-10+T&R's pinout; 'B' replaces PBRST with active-high RST; 'C' includes both RST outputs and PBRST. The device requires no external components for basic operation and disables watchdog via floating ST.

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. RoHS-compliant, tape-and-reel packaged (T&R).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1814AR-10+T&R, MAX823SESA+ offers tighter trip accuracy but omits PBRST, while TPS3808G12DBVR provides threshold flexibility at the cost of added external components for full supervision-making DS1814AR-10+T&R optimal for compact, self-contained 5V MCU reset with manual override.

Availability

DS1814AR-10+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive body control modules, and smart energy meters requiring stable component supply with guaranteed long-term availability.

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 industrial, medical, and communications applications.

The DS1814AR-10+T&R belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically for robust, single-chip reset management in 5V microcontroller systems with power, watchdog, and manual reset requirements.

FAQ

What is the VCC trip point range for DS1814AR-10+T&R?

The DS1814AR-10+T&R has a guaranteed VCC trip point range of 4.25 V to 4.50 V, reflecting its 10% tolerance specification for 5V systems. This threshold is temperature-compensated and ensures reliable reset assertion before the microprocessor enters an undefined operational state. The hysteresis is 10 mV, preventing chatter near the trip point. DS1814AR-10+T&R maintains this specification across its full –40°C to +85°C operating range.

Does DS1814AR-10+T&R support both watchdog and pushbutton reset functions?

Yes, DS1814AR-10+T&R supports both functions. As a Type 'A' variant, it includes ST (strobe input) for watchdog operation with a 1.12 s timeout and PBRST (pushbutton reset input) with built-in debouncing and ≥140 ms reset pulse generation on release. These features are integrated into a single SOT-23-5 package, eliminating the need for external timing or filtering components in DS1814AR-10+T&R implementations.

Can DS1814AR-10+T&R operate below 5V supply?

Yes, DS1814AR-10+T&R operates over 1.0 V to 5.5 V VCC. Its RST output remains valid down to 1.0 V, allowing continued reset assertion during brownout. However, the 4.25–4.50 V trip point is specified only for nominal 5V operation; below ~3.5 V, the internal comparator may not activate reset based on VCC monitoring, though watchdog and PBRST functions remain active. DS1814AR-10+T&R is not intended as a 3V system supervisor.

Is DS1814AR-10+T&R pin-compatible with MAX823 series devices?

Yes, DS1814AR-10+T&R is pin- and function-compatible with the MAX823/24/25 family per manufacturer documentation. Pin 1 (RST), Pin 2 (GND), Pin 3 (PBRST), Pin 4 (ST), and Pin 5 (VCC) match the MAX823SESA+ pinout and electrical behavior. This allows direct substitution in existing designs without PCB modification, provided the 10% trip point (vs. MAX823's 4.63 V) meets system requirements. DS1814AR-10+T&R retains identical SOT-23-5 mechanical footprint.

How is the watchdog timer disabled in DS1814AR-10+T&R?

The watchdog timer in DS1814AR-10+T&R is disabled by leaving the ST pin unconnected (floating) or tri-stated. When ST is not driven high or low, the internal timer remains inactive and will not force RST assertion. This behavior is documented in the DS1814/DS1819 datasheet and verified in application note AN3722. No external pull-up or pull-down is required-DS1814AR-10+T&R internally disables watchdog upon ST float.