Analog Devices Inc. ADM699AR-REEL

Overview

ADM699AR-REEL from Analog Devices is a microprocessor supervisory circuit with integrated watchdog timer, precision 4.65 V voltage monitor, 140–280 ms reset pulse width, and guaranteed RESET assertion down to VCC = 1 V. It monitors +5 V power supplies in embedded controllers and automotive ECUs where reliable brown-out detection and software fault recovery are critical.

For engineers reviewing the ADM699AR-REEL datasheet, ADM699AR-REEL pinout, ADM699AR-REEL application, or ADM699AR-REEL equivalent, key selection criteria include its 1 s watchdog timeout, SOIC-16 package with active-high RESET and WDO outputs, low 0.6 mA supply current, and operation across –40°C to +85°C.

Technical Context

The ADM699AR-REEL implements a precision bandgap-based voltage detector with 40 mV hysteresis and an internal monostable for power-up reset timing. Its watchdog transition detector triggers on rising or falling edges at WDI and resets a 1.0–2.25 s timeout counter on each edge.

Unlike the ADM698, the ADM699AR-REEL adds a three-level WDI input (logic low ≤ 0.8 V, logic high ≥ 3.5 V) and provides two dedicated outputs in SOIC-16: active-low RESET*, active-high RESET, and watchdog status output WDO* - all specified over full industrial temperature range.

Key Specifications

Pinout & Package

ADM699AR-REEL is supplied in a 16-lead SOIC (R-16) package with 1.27 mm pitch, 10.3 mm × 7.5 mm body, and thermal impedance θ_JA = 110°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX699ESA+ and TPS3823-46DBVR, the ADM699AR-REEL uniquely delivers integrated watchdog timing, dual reset polarity, and guaranteed sub-1 V operation - making it optimal for safety-critical systems requiring autonomous fault recovery without µP involvement.

Availability

ADM699AR-REEL is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, and medical infusion pump controllers requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for ADM699AR-REEL 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM698/ADM699 family was designed specifically for robust microprocessor power monitoring and software fault recovery in mission-critical embedded systems operating across extended industrial temperatures.

FAQ

What is the watchdog timeout period for ADM699AR-REEL?

The ADM699AR-REEL features a watchdog timeout period of 1.0 s (typical), with a specified range of 1.0 s to 2.25 s over temperature and supply voltage. This timeout is triggered when the WDI input remains static (high or low) beyond the interval, causing RESET* and WDO* to assert low. The timer resets on every WDI transition, enabling flexible software supervision without external timing components.

Does ADM699AR-REEL provide both active-high and active-low reset outputs?

Yes, the ADM699AR-REEL provides both RESET* (active-low) and RESET (active-high) outputs, exclusively in its 16-lead SOIC package. This dual-output capability eliminates level-shifting circuitry when interfacing with microprocessors that require either reset polarity. The ADM699AR-REEL's RESET output is the logical inverse of RESET*, and both are fully specified across –40°C to +85°C.

Can ADM699AR-REEL operate reliably below 5 V supply?

Yes, ADM699AR-REEL is guaranteed to assert RESET* down to VCC = 1 V, ensuring the microprocessor remains held in reset during deep undervoltage conditions. Its internal voltage detector and reset generator maintain functionality across the full 3.0 V to 5.5 V operating range, with precise 4.65 V threshold tracking and 40 mV hysteresis to reject noise - critical for brown-out resilience in automotive and industrial applications.

How is the watchdog function disabled on ADM699AR-REEL?

The watchdog function on ADM699AR-REEL is disabled by leaving the WDI pin floating or biasing it to midsupply (~2.5 V). Because WDI is a three-level input, it recognizes only defined logic low (≤ 0.8 V) or logic high (≥ 3.5 V) transitions - static mid-voltage or open-circuit states prevent timeout triggering. No external pull-up or pull-down resistors are needed for disable, simplifying design when watchdog functionality is unused.

What package type is used for ADM699AR-REEL?

ADM699AR-REEL uses a 16-lead SOIC (R-16) package with standard 1.27 mm lead pitch, 10.3 mm × 7.5 mm body dimensions, and θ_JA = 110°C/W thermal resistance. This package supports automated assembly, provides mechanical robustness for industrial environments, and accommodates the full pin set including VCC, GND, WDI, RESET*, RESET, and WDO* - unlike the 8-pin DIP or Cerdip variants.