Analog Devices Inc. ADM706RAR-REEL

Overview

ADM706RAR-REEL from Analog Devices is a 3 V microprocessor supervisory circuit with active-low reset output, 2.63 V reset threshold, 200 ms reset pulse width, 100 µA quiescent current, and integrated watchdog timer-designed for reliable power-on reset and brownout protection in embedded microcontroller systems.

For engineers reviewing the ADM706RAR-REEL datasheet, ADM706RAR-REEL pinout, ADM706RAR-REEL application, or ADM706RAR-REEL equivalent, key selection criteria include reset threshold accuracy (±70 mV), guaranteed RESET validity down to VCC = 1 V, debounced manual reset input, independent watchdog timeout (1.6 s), and compatibility with 3 V/3.3 V supply monitoring in space-constrained SOIC-8 designs.

Technical Context

The ADM706RAR-REEL implements a precision bandgap-based voltage reference (2.63 V) for supply monitoring, paired with a monostable reset generator that asserts active-low RESET for 200 ms after VCC rises above threshold or MR deasserts. Its internal watchdog timer detects microprocessor lockup via WDI transitions and forces WDO low on timeout.

It integrates a 1.25 V power-fail comparator (PFI/PFO) for early warning of supply collapse and supports bidirectional reset line interfacing via external current-limiting resistors. All logic inputs are TTL/CMOS-compatible with internal 70 µA pull-up on MR.

Key Specifications

Pinout & Package

ADM706RAR-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and 1.75 mm max height-optimized for automated assembly and thermal performance in industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706RCSA+ and TPS3808G18DBVR, ADM706RAR-REEL uniquely combines 2.63 V precision reset, integrated 1.6 s watchdog, and 1.25 V PFI comparator in a single SOIC-8 package-making it optimal for compact, safety-aware 3 V microcontroller systems requiring multi-layer supervision.

Availability

ADM706RAR-REEL is available at Aetrix Electronics and suitable for industrial control, portable instrumentation, automotive telematics, and smart sensor node designs requiring stable component supply across extended temperature ranges.

Supply support for ADM706RAR-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 ADM706 family was designed specifically for robust, low-power microprocessor supervision in 3 V/3.3 V embedded systems-emphasizing precision voltage monitoring, guaranteed low-VCC operation, and integrated fault-detection features like watchdog and power-fail warning.

FAQ

What is the reset threshold voltage of the ADM706RAR-REEL?

The ADM706RAR-REEL has a nominal reset threshold voltage of 2.63 V, with a tolerance of ±70 mV (2.55 V to 2.70 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The threshold applies to VCC monitoring and determines when the active-low RESET output is asserted during power-up, brownout, or power-down events. It is optimized for reliable operation with 3 V supply rails.

Does the ADM706RAR-REEL include a watchdog timer function?

Yes, the ADM706RAR-REEL includes a fully integrated watchdog timer with a nominal timeout period of 1.6 seconds. It monitors the WDI input for transitions and drives the WDO output low if no edge is detected within that interval. The timer resets on any WDI transition (high-to-low or low-to-high) and is also cleared during RESET assertion. This feature is confirmed in the ADM706R variant datasheet and applies directly to ADM706RAR-REEL.

What package type and footprint does the ADM706RAR-REEL use?

The ADM706RAR-REEL is supplied in an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow body) package, designated R-8 per JEDEC MS-012-AA. It measures 5.00 mm × 4.00 mm with 1.27 mm lead pitch and is compatible with standard SOIC-8 PCB footprints. The "-REEL" suffix indicates tape-and-reel packaging for automated SMT assembly.

Can the ADM706RAR-REEL monitor a second power supply?

Yes, the ADM706RAR-REEL can monitor a second supply using its dedicated PFI (Power-Fail Input) and PFO (Power-Fail Output) pins. By connecting the auxiliary supply through a resistor divider to PFI, the internal 1.25 V comparator triggers PFO low when the divided voltage falls below threshold. This enables early-warning detection for battery voltage, analog rails, or preregulator outputs-without affecting primary VCC supervision.

Is the ADM706RAR-REEL pin-compatible with the MAX706R series?

The ADM706RAR-REEL is functionally and pin-compatible with the MAX706R series in SOIC-8 packages, sharing identical pin assignments for MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO. However, design validation is required for timing margins and absolute maximum ratings, as Analog Devices specifies tighter reset threshold tolerance (±70 mV vs. ±150 mV for some MAX706R variants) and guaranteed RESET operation down to VCC = 1 V.