Analog Devices Inc. ADM8699ARWZ

Overview

ADM8699ARWZ from Analog Devices is a microprocessor supervisory circuit with integrated watchdog timer, precision 4.65 V voltage monitor, guaranteed RESET assertion down to VCC = 1 V, 140–280 ms reset pulse width, and 1.0–2.25 s watchdog timeout. It serves as a system-level power integrity guardian in embedded controllers requiring fail-safe boot and runtime supervision.

For engineers reviewing the ADM8699ARWZ datasheet, ADM8699ARWZ pinout, ADM8699ARWZ application, or ADM8699ARWZ equivalent, key selection criteria include its SOIC-16 package with dual RESET outputs (active-low RESET and active-high RESET), WDI three-level input tolerance, WDO status output, and guaranteed operation across –40°C to +85°C industrial temperature range.

Technical Context

The ADM8699ARWZ implements a precision bandgap-based voltage detector with 40 mV hysteresis to prevent false resets during VCC transients, and an internal monostable that enforces minimum 140 ms RESET assertion on power-up, brown-out, and watchdog timeout events. Its watchdog transition detector responds to any high-to-low or low-to-high edge on WDI, resetting the 1.6 s typical timeout period on each valid toggle.

Unlike the ADM8698, the ADM8699ARWZ adds dedicated WDI and WDO signal paths - WDI accepts three-level logic (0.8 V low / 3.5 V high), and WDO provides open-drain watchdog status synchronized to WDI transitions and VCC threshold crossing. The SOIC-16 package enables simultaneous access to both inverted and non-inverted RESET outputs plus WDO.

Key Specifications

Pinout & Package

ADM8699ARWZ is packaged in a 16-lead SOIC (R-16) with 1.27 mm pitch, 10.3 mm × 7.5 mm body, and standard JEDEC MS-013AC outline. Pin 1 marked with dot; pins 1–8 on top row left-to-right, pins 9–16 on bottom row right-to-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX699CSA+ and TPS3823-46DBVR, the ADM8699ARWZ uniquely delivers integrated watchdog supervision, dual RESET polarity, and guaranteed sub-1 V reset hold-down - making it the only option among the three qualified for safety-critical, self-healing embedded systems requiring both power integrity and software execution assurance.

Availability

ADM8699ARWZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and telecom remote terminal units requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.

Supply support for ADM8699ARWZ 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 ADM8699ARWZ belongs to Analog Devices' microprocessor supervisory circuits product line, engineered specifically for robust power-on-reset, brown-out protection, and software-fault recovery in mission-critical embedded systems.

FAQ

What is the function of the WDI pin on the ADM8699ARWZ?

The WDI (Watchdog Input) pin on the ADM8699ARWZ is a three-level input that monitors microprocessor activity. Each high-to-low or low-to-high transition resets the internal 1.6 s watchdog timer. If no transition occurs within the timeout window, ADM8699ARWZ asserts RESET and pulls WDO low. Leaving WDI floating disables the watchdog function entirely.

Does the ADM8699ARWZ provide both active-high and active-low RESET outputs?

Yes, the ADM8699ARWZ in the 16-lead SOIC package (ARWZ) provides two independent RESET outputs: pin 9 is active-low RESET, and pin 15 is active-high RESET - the logical inverse. This dual-output capability eliminates the need for external inverters when interfacing with microprocessors requiring different reset polarity.

What is the minimum VCC voltage at which ADM8699ARWZ guarantees RESET assertion?

The ADM8699ARWZ guarantees RESET remains asserted (low) down to VCC = 1 V, with RESET output voltage specified at 12–200 mV when sinking 100 µA. This ensures reliable microprocessor hold-down during deep brown-out or battery-depletion scenarios where other supervisors may release prematurely.

Can the ADM8699ARWZ watchdog timer be disabled?

Yes, the ADM8699ARWZ watchdog timer is automatically disabled when the WDI pin is left floating or driven to midsupply (~2.5 V). In this state, the watchdog logic is inactive, WDO remains high, and only power-supply monitoring (RESET generation on VCC faults) remains functional - enabling flexible configuration without hardware modification.

What package type does the ADM8699ARWZ use, and what are its key mechanical features?

The ADM8699ARWZ uses a 16-lead SOIC (R-16) package per JEDEC MS-013AC, measuring 10.3 mm × 7.5 mm with 1.27 mm lead pitch. It features dual VCC (pins 2, 3) and dual GND (pins 1, 4) for improved power integrity, and accommodates both RESET polarities plus WDI and WDO on a single compact footprint.