Analog Devices Inc. ADM8699ARNZ

Overview

ADM8699ARNZ from Analog Devices is a microprocessor supervisory circuit with integrated watchdog timer, precision 4.65 V voltage monitor, 140–280 ms reset pulse width, guaranteed RESET assertion down to VCC = 1 V, and WDI input for software activity monitoring. It serves as a system-level power integrity guard in embedded controllers requiring fail-safe reset behavior during brownout or firmware lockup.

For engineers reviewing the ADM8699ARNZ datasheet, ADM8699ARNZ pinout, ADM8699ARNZ application, or ADM8699ARNZ equivalent, key selection criteria include its 1-second watchdog timeout (typ), active-low open-drain RESET output, SOIC-8 package compatibility, and support for industrial temperature range (–40°C to +85°C) without external components.

Technical Context

The ADM8699ARNZ implements a precision bandgap-based voltage detector with 40 mV hysteresis and a monostable power-on reset generator that guarantees ≥140 ms low-active RESET pulse after VCC exceeds 4.65 V. Its watchdog transition detector resets on every WDI edge and triggers RESET if no toggle occurs within 1.0–2.25 s.

Unlike the ADM8698, the ADM8699ARNZ includes a three-level WDI input (logic low ≤0.8 V, logic high ≥3.5 V) and supports watchdog disable via floating or mid-supply bias. The SOIC-8 package provides VCC, GND, RESET, and WDI only - no WDO or active-high RESET outputs, which are exclusive to the 16-lead SOIC variant.

Key Specifications

Pinout & Package

ADM8699ARNZ is housed in an 8-pin SOIC (R-8) package with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC compliant outline. Pin 1 is marked by a beveled corner or dot; device is rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX699ESA+ and TPS3808G33DBVR, the ADM8699ARNZ uniquely combines guaranteed sub-2 V reset assertion, integrated edge-triggered watchdog, and minimal external component count - making it optimal for space-constrained, safety-aware embedded systems where both power and software integrity must be enforced simultaneously.

Availability

ADM8699ARNZ is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature performance.

Supply support for ADM8699ARNZ 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 ADM8698/ADM8699 product line was engineered specifically for robust microprocessor supervision in harsh environments - delivering deterministic reset timing, low-power operation, and integrated watchdog capability without external timing components.

FAQ

What is the watchdog timeout period for ADM8699ARNZ?

The ADM8699ARNZ features a watchdog timeout period of 1.0 s (minimum), 1.6 s (typical), and 2.25 s (maximum). This window is measured from the last WDI transition; failure to toggle WDI within this interval forces RESET low. The timeout is internally generated and does not require external capacitors or resistors, ensuring consistent timing across temperature and voltage variations in the ADM8699ARNZ.

Does ADM8699ARNZ provide an active-high RESET output?

No, the ADM8699ARNZ in the 8-pin SOIC (R-8) package only provides the active-low open-drain RESET output. Active-high RESET and WDO outputs are exclusive to the 16-lead SOIC variant (ADM8699ARW). Using ADM8699ARNZ requires an external pull-up resistor on the RESET pin to interface with microprocessors expecting active-high reset signaling.

Can ADM8699ARNZ operate reliably below 5 V supply?

Yes, the ADM8699ARNZ operates across a VCC range of 3.0 V to 5.5 V and guarantees functional RESET assertion down to VCC = 1 V. Its internal voltage monitor remains active and the RESET output stays low until VCC rises above 4.65 V (with 40 mV hysteresis), enabling safe microprocessor shutdown and controlled restart during deep brownout conditions - a verified specification for the ADM8699ARNZ.

How is the watchdog function disabled on ADM8699ARNZ?

The watchdog function in ADM8699ARNZ is disabled by leaving the WDI pin floating or biasing it to approximately VCC/2 (midsupply). When WDI is unconnected, the internal three-level comparator detects no valid logic transition, preventing watchdog timeout assertion. This allows the ADM8699ARNZ to operate as a standalone voltage supervisor without requiring µP I/O toggling - confirmed in the functional block diagram and pin description sections of the ADM8699ARNZ datasheet.

What package type is used for ADM8699ARNZ?

ADM8699ARNZ uses an 8-pin small-outline integrated circuit (SOIC) package, designated R-8 in Analog Devices' ordering guide. It conforms to JEDEC MS-012AC dimensions: 4.90 mm × 3.91 mm body size, 1.27 mm lead pitch, and gull-wing surface-mount leads. This package is RoHS-compliant and rated for industrial temperature operation (–40°C to +85°C), matching the specifications published for the ADM8699ARNZ.