Analog Devices Inc. ADM706RAR-REEL7

Overview

ADM706RAR-REEL7 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. It monitors power supply integrity during power-up, brownout, and shutdown in embedded controllers and battery-powered instrumentation.

For engineers reviewing the ADM706RAR-REEL7 datasheet, ADM706RAR-REEL7 pinout, ADM706RAR-REEL7 application, or ADM706RAR-REEL7 equivalent, this page delivers verified specifications, functional context, package mapping, real-world use cases, and validated alternative parts for industrial-grade system reset and power-fail monitoring.

Technical Context

The ADM706RAR-REEL7 implements a precision voltage monitor with 2.63 V ±40 mV threshold and guaranteed RESET validity down to VCC = 1 V. Its internal 1.6 sec watchdog timer clears on any WDI transition and asserts WDO low on timeout - independent of reset generation.

It integrates a 1.25 V power-fail comparator (PFI/PFO) for early warning of supply collapse and features debounced MR input with 70 µA internal pull-up. All logic outputs meet TTL/CMOS drive requirements across 2.7–5.5 V VCC range.

Key Specifications

Pinout & Package

ADM706RAR-REEL7 is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, with gull-wing leads and coplanarity ≤ 0.10 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706RCSA+T and TPS3808G18DBVR, ADM706RAR-REEL7 uniquely combines 2.63 V precision reset, integrated watchdog, and independent PFI/PFO power-fail detection in a single SOIC-8 package - enabling compact, feature-complete supervision without external components.

Availability

ADM706RAR-REEL7 is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered data loggers, medical safety circuits, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for ADM706RAR-REEL7 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 harsh environments - delivering precision reset, watchdog, and power-fail detection in minimal footprint for mission-critical embedded systems.

FAQ

What is the reset threshold voltage of the ADM706RAR-REEL7?

The ADM706RAR-REEL7 has a nominal reset threshold of 2.63 V, with a tolerance of ±40 mV over temperature and supply range. This value is factory-trimmed and specified in Table 1 of the Rev. E datasheet. The threshold ensures reliable reset assertion for 3 V systems before brownout causes microprocessor malfunction, and it remains stable across the −40°C to +85°C industrial temperature range. ADM706RAR-REEL7 uses an internal bandgap reference to maintain accuracy without external calibration.

Does the ADM706RAR-REEL7 include a watchdog timer function?

Yes, the ADM706RAR-REEL7 includes a fully integrated watchdog timer with a nominal timeout period of 1.6 seconds. The timer resets on any edge (high-to-low or low-to-high) at the WDI pin and asserts the WDO output low if no transition occurs within that window. The timer is also cleared automatically when RESET is asserted. This functionality is confirmed in the Functional Block Diagram (Figure 13), General Description, and Watchdog Timer section of the ADM706RAR-REEL7 datasheet.

What is the purpose of the PFI and PFO pins on the ADM706RAR-REEL7?

The PFI (Power-Fail Input) and PFO (Power-Fail Output) pins implement an independent 1.25 V comparator channel on the ADM706RAR-REEL7. PFI accepts a scaled-down version of a secondary supply (e.g., battery or auxiliary rail) via a resistor divider; when PFI falls below 1.25 V, PFO goes low to signal impending failure. This enables early-warning shutdown before main supply collapse. The ADM706RAR-REEL7 datasheet confirms PFI threshold as 1.25 V ±50 mV and specifies PFO as an active-low push-pull output.

Can the ADM706RAR-REEL7 operate with supply voltages below 3 V?

Yes, the ADM706RAR-REEL7 operates from VCC = 2.7 V to 5.5 V and guarantees valid RESET output down to VCC = 1 V. Its internal circuitry remains functional during supply ramp-down, ensuring the microprocessor stays held in reset until VCC drops below 1 V. This behavior is explicitly tested and documented in the "Valid RESET Below 1 V VCC" section (Page 11) and Typical Performance Characteristics (Figure 6) of the ADM706RAR-REEL7 datasheet.

What package type and lead count does the ADM706RAR-REEL7 use?

The ADM706RAR-REEL7 uses an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow body) package, designated R-8 per JEDEC MS-012-AA. It measures 4.9 mm × 3.9 mm with 1.27 mm lead pitch and gull-wing leads. This package is confirmed in the Ordering Guide (Page 14) and Outline Dimensions (Figure 25) of the ADM706RAR-REEL7 datasheet. The "-REEL7" suffix indicates tape-and-reel packaging with 1,000 units per reel.