Analog Devices Inc. ADM706SARZ-REEL

Overview

ADM706SARZ-REEL from Analog Devices is a 3 V microprocessor supervisory circuit with active-low reset output, 2.93 V precision voltage monitoring threshold, 200 ms reset pulse width, 100 µA quiescent current, and integrated watchdog timer with 1.6 sec timeout-designed for reliable power-up, brownout, and software fault recovery in embedded microcontroller systems.

For engineers reviewing the ADM706SARZ-REEL datasheet, ADM706SARZ-REEL pinout, ADM706SARZ-REEL application, or ADM706SARZ-REEL equivalent, key selection criteria include reset threshold accuracy (±40 mV), guaranteed RESET validity down to VCC = 1 V, debounced manual reset input (MR), independent PFI/PFO power-fail warning capability, and SOIC-8 packaging for space-constrained industrial PCBs.

Technical Context

The ADM706SARZ-REEL implements a precision bandgap-based voltage reference (2.93 V ±40 mV) for supply monitoring and a separate 1.25 V comparator for power-fail detection via PFI. Its internal watchdog timer resets on any WDI transition and times out after 1.6 sec if inactive, driving WDO low to trigger NMI or system reset.

Reset generation is fully autonomous: RESET asserts low when VCC drops below 2.93 V or MR is pulled below 0.6 V, remains active for 200 ms after recovery, and stays valid even as VCC falls to 1 V-ensuring deterministic microprocessor hold during power collapse.

Key Specifications

Pinout & Package

ADM706SARZ-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch, 5.00 mm × 4.00 mm body, and gull-wing leads. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM706SARZ-REEL, MAX706SESA+ saves power but removes watchdog capability, while TPS3808G33DBVR improves threshold accuracy and reduces IQ yet eliminates both PFI/PFO and WDI/WDO-making ADM706SARZ-REEL uniquely suited for integrated supervision of 3 V systems requiring coordinated reset, watchdog, and auxiliary supply monitoring.

Availability

ADM706SARZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical devices, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM706SARZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets since 1965.

The ADM706 family was designed specifically for robust microprocessor supervision in harsh environments-delivering precision voltage monitoring, deterministic reset timing, and integrated fault detection in compact SOIC-8 packages.

FAQ

What is the exact reset threshold voltage of the ADM706SARZ-REEL?

The ADM706SARZ-REEL has a nominal reset threshold of 2.93 V, with a guaranteed range of 2.85 V to 3.00 V at TA = −40°C to +85°C. This value is specified in Table 1 of the Rev. E datasheet and applies exclusively to the 'S' suffix variant, ensuring precise supervision of 3 V supply rails without external adjustment.

Does the ADM706SARZ-REEL support operation down to 1 V VCC, and what does that mean for system design?

Yes, the ADM706SARZ-REEL guarantees valid RESET output down to VCC = 1 V, meaning it continues asserting the active-low RESET signal even as the supply collapses-preventing premature microprocessor release. This ensures deterministic shutdown behavior in brownout or battery-depletion scenarios, eliminating metastability risks in safety-critical designs.

How does the watchdog timer in the ADM706SARZ-REEL function, and what is its timeout period?

The ADM706SARZ-REEL watchdog timer monitors the WDI input and times out after 1.6 seconds if no edge transition occurs. Upon timeout, WDO drives low to signal a fault. The timer resets on any WDI edge (high-to-low or low-to-high), accepts pulses as narrow as 50 ns, and is also cleared automatically when RESET is asserted.

Can the ADM706SARZ-REEL monitor a second power supply, and how is this implemented?

Yes, the ADM706SARZ-REEL includes a dedicated 1.25 V power-fail comparator accessible via PFI and PFO pins. By connecting an external resistor divider from a secondary supply to PFI, the device detects when that supply falls below the 1.25 V threshold and asserts PFO low-enabling early-warning interrupts or cascaded reset triggering without additional ICs.

What package type and lead count does the ADM706SARZ-REEL use, and is it RoHS-compliant?

The ADM706SARZ-REEL uses an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch and Pb-free (RoHS-compliant) terminations. The "-REEL" suffix indicates tape-and-reel packaging for automated SMT assembly, and the "Z" denotes lead-free finish per Analog Devices' environmental compliance standards.