The ADM706 is a low-cost microprocessor (µP) supervisory circuit from Analog Devices that bundles the three functions almost every embedded system needs to stay reliable: a power-on/brownout reset, a watchdog timer, and a power-fail comparator. ADM706SARZ-REEL is the RoHS-compliant ("Z") 8-lead SOIC version on tape and reel, from the ADM705/706/707/708 supervisory family.

The core job is the reset. The ADM706 monitors VCC against a 4.65 V threshold; if the supply dips below it, the active-low RESET (pin 7, push-pull) asserts and holds the processor in reset for a guaranteed pulse width (~200 ms) after VCC recovers, so the µP always starts from a known state. Critically, RESET stays valid with VCC as low as 1 V, so the processor cannot run on a collapsing rail. A manual reset input (MR, pin 1) lets a button or logic force a reset.

Two more guards complete it. The watchdog expects the µP to toggle WDI (pin 6) within ~1.6 s; if the code hangs and the strobe stops, WDO (pin 8) asserts so the system can recover. The power-fail comparator compares PFI (pin 4) against a 1.25 V reference and drives PFO (pin 5) - tie PFI to a divider on the unregulated input and PFO warns the µP of an impending power loss before VCC itself falls, giving time to save data. All of this runs on about 190 µA in an 8-lead SOIC.

Note: Values are taken from the Analog Devices ADM706 datasheet. Confirm every parameter against the latest official documentation before committing a design.

ADM706SARZ-REEL is supplied in the 8-lead SOIC (ADI outline R-8, "S" denotes the SO package). "Z" marks the RoHS-compliant lead-free finish and "REEL" the tape-and-reel packing. The same ADM706 die is also offered in 8-lead PDIP (N-8) and 8-lead MicroSOIC (RM-8). Place the supervisor close to the processor's VCC and reset pins, keep the RESET trace short, and tie WDI to a CPU I/O (or leave it three-stated to disable the watchdog). Package dimensions and pin-1 orientation are shown below.

📄 Full specifications are detailed in the official Analog Devices ADM706 datasheet.

The 8-lead SOIC brings out the reset, watchdog and power-fail functions:

• Pin 1 - MR: Manual reset input, active low.
• Pin 2 - VCC: Supply (monitored against the 4.65 V threshold).
• Pin 3 - GND: Ground.
• Pin 4 - PFI: Power-fail comparator input (vs 1.25 V reference).
• Pin 5 - PFO: Power-fail output, active low.
• Pin 6 - WDI: Watchdog input; strobe within ~1.6 s, three-state to disable.
• Pin 7 - RESET: Reset output, active low, push-pull.
• Pin 8 - WDO: Watchdog output, active low.

Refer to the package drawing below for the physical pin numbering of the 8-lead SOIC.

The parts below are related ADI supervisory and reset ICs, available in our catalog. They are not all drop-in replacements; verify reset polarity, watchdog, threshold and pinout before substituting.

Selection Tips: Stay with the ADM706 when you need reset + independent watchdog + power-fail in one 8-pin part. The ADM705/707/708 are the same family with different reset polarity and feature mixes - match the RESET polarity your CPU needs. When only a simple power-on reset is required, the 3-pin ADM809/ADM811 in SOT-23 are smaller and cheaper.

Analog Devices, Inc. (ADI), headquartered in Wilmington, Massachusetts, USA, is a global leader in high-performance analog, mixed-signal and RF semiconductors, with a broad line of microprocessor supervisory and reset circuits. The ADM706 sits in ADI's low-cost supervisor family, integrating reset, watchdog and power-fail monitoring for reliable embedded systems.

ADI backs the ADM706 with full datasheet characterization and application guidance on threshold selection, watchdog strobing and power-fail divider design - the details that determine whether a system rides through brownouts and code hangs cleanly.