Analog Devices Inc. ADM8695ARW

Overview

ADM8695ARW from Analog Devices is a 16-lead TSSOP microprocessor supervisory circuit providing precision reset generation (200 ms nominal), adjustable watchdog timeout (100 ms / 1.6 s / external), battery backup switchover (VBATT to VOUT), CE signal gating (3 ns propagation), and power-fail warning (1.3 V PFI threshold). It ensures system reliability in industrial controllers and embedded instrumentation with VCC operation down to 1 V.

For engineers reviewing the ADM8695ARW datasheet, ADM8695ARW pinout, ADM8695ARW application, or ADM8695ARW equivalent, key selection concerns include reset pulse width adjustability, dual-mode watchdog configuration, battery switchover hysteresis (20 mV), CEIN/CEOUT timing integrity, and compatibility with 5 V ±5% supplies requiring guaranteed 4.5–4.73 V reset threshold.

Technical Context

The ADM8695ARW integrates a precision 4.65 V reset comparator with 40 mV hysteresis, an internal oscillator selectable between 100 ms and 1.6 s watchdog periods, and an external clock/capacitor interface (OSC IN/OSC SEL) for configurable timing. Its battery switchover uses PMOS/NMOS switching with 0.7 Ω (VCC→VOUT) and 7 Ω (VBATT→VOUT) on-resistance.

It delivers three independent logic outputs-RESET (active low), WDO (watchdog status), and LOW LINE (VCC < threshold)-plus CEOUT gating synchronized to CEIN with forced high-state during brownout. The PFI/PFO comparator operates independently at 1.3 V with ±25 nA input current and sub-μs response.

Key Specifications

Pinout & Package

ADM8695ARW is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for space-constrained industrial PCB layouts while maintaining thermal performance (θJA = 158°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM8691ARW and MAX695CSA+, the ADM8695ARW uniquely combines 200 ms adjustable reset, full CE signal protection, and integrated power-fail warning-enabling robust data integrity in systems where extended initialization, memory write safety, and predictive power-loss response are mandatory.

Availability

ADM8695ARW is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical diagnostic instruments, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM8695ARW 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM8695ARW belongs to Analog Devices' microprocessor supervisory IC product line, engineered for mission-critical power monitoring, battery backup, and system-level fault containment in industrial, automotive, and medical electronics.

FAQ

What is the guaranteed minimum operating VCC voltage for ADM8695ARW reset functionality?

The ADM8695ARW guarantees RESET output functionality down to VCC = 1 V, ensuring the microprocessor remains held in reset during deep brownout conditions. This specification is validated across the full industrial temperature range (−40°C to +85°C) and allows safe system shutdown even as the main supply collapses well below nominal 5 V. The ADM8695ARW maintains this capability while delivering accurate reset assertion and battery switchover control.

How does the ADM8695ARW implement write protection for CMOS RAM?

The ADM8695ARW implements write protection via its CEIN/CEOUT interface: CEOUT is a buffered, 3 ns-delayed replica of CEIN during normal operation, but is forced high whenever VCC falls below the 4.65 V reset threshold. This action disables chip enable or write inputs to battery-backed RAM, preventing corruption during power instability. The ADM8695ARW achieves this without external logic, using internal analog comparators and fast gating circuitry.

Can the ADM8695ARW watchdog timeout be configured for periods other than 100 ms or 1.6 s?

Yes-the ADM8695ARW supports externally adjustable watchdog timeout using either an external clock signal (0–500 kHz applied to OSC IN with OSC SEL low) or a capacitor (e.g., 47 pF to 1000 pF) connected between OSC IN and GND. With a 47 pF capacitor, nominal timeouts are 400 ms (normal) and 1.6 sec (post-reset); scaling follows fOSC (Hz) = 184,000/C (pF). This configurability is exclusive to the ADM8695ARW and ADM8691ARW within the family.

What is the purpose of the LOW LINE output on the ADM8695ARW?

The LOW LINE output on the ADM8695ARW is an active-high signal that asserts high whenever VCC exceeds the 4.65 V reset threshold. Unlike the delayed RESET output, LOW LINE responds immediately to VCC crossing the threshold-providing real-time supply health status for diagnostics or auxiliary control logic. It operates independently of reset pulse timing and remains functional across the full VCC operating range, making it ideal for continuous monitoring in safety-critical systems using the ADM8695ARW.

Does the ADM8695ARW support both lithium batteries and supercapacitors for backup power?

Yes-the ADM8695ARW supports backup sources from 2.0 V to 4.25 V, including primary lithium cells (e.g., CR2032), rechargeable lithium coin cells, and supercapacitors. Its battery switchover circuit draws only 0.4 μA in backup mode, and the VBATT terminal sources a safe 10 nA charging current-sufficient to offset self-discharge in lithium batteries without risk of overcharge. This makes the ADM8695ARW suitable for long-life, maintenance-free backup in meters, controllers, and portable medical devices.