Analog Devices Inc. ADM8698ARNZ

Overview

ADM8698ARNZ from Analog Devices is a microprocessor supervisory circuit designed for 5 V power supply monitoring and reset generation in embedded systems. It features a precision 4.65 V voltage monitor, guaranteed RESET assertion down to VCC = 1 V, 70 µA supply current, 140–280 ms reset active time, and operates across –40°C to +85°C. It is used in industrial controllers and critical microprocessor power monitoring where reliable brown-out detection is required.

For engineers reviewing the ADM8698ARNZ datasheet, ADM8698ARNZ pinout, ADM8698ARNZ application, or ADM8698ARNZ equivalent, key selection criteria include its guaranteed low-voltage reset functionality, watchdog-free architecture (vs. ADM8699), SOIC-8 package compatibility, and precise 4.65 V threshold with 40 mV hysteresis for noise-immune power fail detection.

Technical Context

The ADM8698ARNZ implements a dedicated voltage-monitoring circuit with internal monostable timing for power-up and brown-out reset assertion. Its reset generator guarantees functional logic-low output even at VCC = 1 V, enabling stable microprocessor shutdown during deep undervoltage conditions.

No watchdog timer is present - unlike the ADM8699 - making it suitable for systems requiring only power-supply supervision without software activity monitoring. The device uses a precision bandgap reference and comparator with 40 mV hysteresis to prevent false triggering from VCC transients.

Key Specifications

Pinout & Package

ADM8698ARNZ is housed in an 8-lead SOIC (R-8) package with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC compliant dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX698CSA+ and TPS3808G33DBVR, the ADM8698ARNZ uniquely delivers guaranteed reset functionality down to VCC = 1 V in an SOIC-8 package - essential for systems requiring fail-safe behavior during extreme undervoltage, whereas alternatives trade this capability for lower IQ or different voltage ranges.

Availability

ADM8698ARNZ is available at Aetrix Electronics and suitable for industrial controllers, automotive ECUs, and intelligent instruments requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.

Supply support for ADM8698ARNZ 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, communications, automotive, and consumer markets since 1965.

The ADM8698/ADM8699 family was engineered specifically for robust microprocessor power supervision in harsh environments - emphasizing low-voltage reset assurance, noise immunity, and minimal external component count.

FAQ

What is the reset threshold voltage of the ADM8698ARNZ?

The ADM8698ARNZ has a nominal reset threshold of 4.65 V, with a guaranteed range of 4.5 V to 4.75 V over temperature and process variation. This threshold is optimized for 5 V systems, allowing reset assertion before the microprocessor's minimum operating voltage is violated. The device also includes 40 mV of hysteresis to prevent chatter during slow VCC recovery. The ADM8698ARNZ maintains this specification across its full –40°C to +85°C operating range.

Does the ADM8698ARNZ include a watchdog timer?

No, the ADM8698ARNZ does not include a watchdog timer. It is the non-watchdog variant of the ADM8698/ADM8699 family. Only the ADM8699 variants feature the WDI input and associated watchdog functionality. The ADM8698ARNZ provides voltage monitoring and reset generation only - making it ideal for applications where software supervision is handled externally or not required.

What is the minimum VCC voltage at which ADM8698ARNZ guarantees RESET output functionality?

The ADM8698ARNZ guarantees RESET output functionality (logic-low state) down to VCC = 1 V, with a measured RESET output voltage ≤200 mV at ISINK = 100 µA. This capability ensures the microprocessor remains held in reset during deep brown-out or controlled power-down sequences - a key differentiator versus most competing supervisors that cease operation below 2.5 V.

What package type is used for the ADM8698ARNZ?

The ADM8698ARNZ uses an 8-lead SOIC (Small Outline Integrated Circuit) package, designated R-8 in Analog Devices' ordering guide. It conforms to JEDEC MS-012AC outline dimensions, with 1.27 mm lead pitch and gull-wing leads. This surface-mount package supports automated assembly and offers better thermal performance than DIP variants, while maintaining pin compatibility with other 8-pin SOIC supervisory ICs.

Can the ADM8698ARNZ drive a microprocessor reset pin directly?

Yes, the ADM8698ARNZ RESET* output is an open-drain driver capable of sinking up to 3.2 mA at VCC = 4.4 V, with a maximum VOL of 0.4 V. This meets or exceeds the input current and voltage requirements of most microprocessors' active-low reset pins. A pull-up resistor (typically 10 kΩ to VCC) is required externally. No level-shifting or buffering is needed for standard 5 V logic interfaces.