Analog Devices Inc./Maxim Integrated DS1819AR-10+T&R

Overview

DS1819AR-10+T&R from Maxim Integrated is a 3.3V microprocessor supervisory circuit in SOT-23-5 package, featuring 10% V_CC trip point (2.85–3.00 V), 140 ms minimum reset pulse width, watchdog timeout of 1.12 s, pushbutton reset input, and industrial temperature range (−40°C to +85°C). It halts and restarts out-of-control microprocessors during power transients or software faults in embedded control systems.

For engineers reviewing the DS1819AR-10+T&R datasheet, DS1819AR-10+T&R pinout, DS1819AR-10+T&R application, or DS1819AR-10+T&R equivalent, key selection criteria include V_CC trip accuracy, reset timing stability, watchdog strobe compatibility, pushbutton debounce behavior, and SOT-23-5 footprint constraints in space-constrained 3.3V microcontroller designs.

Technical Context

The DS1819AR-10+T&R implements a precision voltage monitor with 5 mV hysteresis, a 1.12 s watchdog timer triggered by ST input transitions, and a debounced PBRST input that generates a guaranteed 140 ms active-low reset pulse upon button release. Its push-pull RST output remains valid down to 1.0 V V_CC, supporting brown-out detection in low-voltage microcontroller systems.

It operates across 1.0–5.5 V supply range with typical quiescent current of 10 µA at 3.6 V, supports noise-immune inputs (100 ns pulse rejection on PBRST), and integrates all supervision functions-power-on reset, manual reset, and watchdog-in a single 5-pin SOT-23 package without external components.

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, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX823SEUR+T and TPS3808G12DBVR, the DS1819AR-10+T&R delivers fixed 3.3 V supervision with integrated pushbutton and watchdog in one chip-reducing BOM count and layout area while guaranteeing deterministic 140 ms reset timing without configuration overhead.

Availability

DS1819AR-10+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, medical sensor nodes, and IoT edge gateways requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for DS1819AR-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, automotive, and communications applications.

The DS1819AR-10+T&R belongs to the MicroMonitor™ family-engineered specifically for reliable microprocessor supervision in 3.3 V embedded systems where power integrity, software fault recovery, and manual reset coordination are critical.

FAQ

What is the exact V_CC trip point range for DS1819AR-10+T&R?

The DS1819AR-10+T&R has a guaranteed V_CC trip point range of 2.85 V to 3.00 V, corresponding to its 10% tolerance specification for 3.0 V systems. This range is validated across −40°C to +85°C and includes 5 mV hysteresis to prevent chatter near the threshold. The DS1819AR-10+T&R uses an internal temperature-compensated reference to maintain accuracy without external calibration.

Does DS1819AR-10+T&R support both active-low and active-high reset outputs?

No, the DS1819AR-10+T&R provides only a single active-low reset output (RST) on Pin 1. Unlike DS1819B or DS1819C variants, it does not include an active-high RST output. The DS1819AR-10+T&R is the 'A' version, which features RST (active-low), GND, PBRST, ST, and V_CC-confirmed by the official pin assignment table and device marking code '19A'.

Can the watchdog timer in DS1819AR-10+T&R be disabled, and how?

Yes, the watchdog timer in DS1819AR-10+T&R can be disabled by leaving the ST pin (Pin 4) floating or tri-stated-no external pull-up or pull-down is required. When ST is unconnected, the internal watchdog circuit remains inactive and will not assert RST due to timeout. This behavior is explicitly documented in the Operation section and verified in Figure 6 (Watchdog Disable Circuit) of the DS1814/DS1819 datasheet.

What is the minimum V_CC level at which DS1819AR-10+T&R guarantees valid RST output?

The DS1819AR-10+T&R guarantees valid RST output down to 1.0 V V_CC using its internal push-pull driver. Below 1.0 V, a 100 kΩ pull-down resistor from RST to GND can extend validity to 0 V V_CC, as shown in Figure 9. This capability ensures deterministic reset assertion during deep brown-out conditions where other supervisors may lose output control.

Is DS1819AR-10+T&R pin-compatible with MAX823 series devices?

Yes, DS1819AR-10+T&R is pin- and function-compatible with the MAX823/24/25 family per the official Features section. All share identical SOT-23-5 pinout (RST, GND, PBRST, ST, V_CC) and match on core functions: power monitoring, watchdog, and pushbutton reset. However, trip voltages differ-DS1819AR-10+T&R targets 3.0 V systems, while MAX823 variants target 5 V-so voltage compatibility must be verified per application.