Analog Devices Inc. ADM8696ARW

Overview

ADM8696ARW from Analog Devices is a microprocessor supervisory circuit integrating power-on/brownout reset, adjustable low-line voltage monitoring (1.3 V threshold), battery backup switchover (VBATT to VOUT), watchdog timer with 100 ms / 1.6 s selectable timeout, and power-fail warning (PFI/PFO). It operates from 3.0 V to 5.5 V VCC and supports CMOS RAM backup in industrial systems requiring reliable power sequencing and fault recovery.

For engineers reviewing the ADM8696ARW datasheet, ADM8696ARW pinout, ADM8696ARW application, or ADM8696ARW equivalent, key selection considerations include its guaranteed RESET assertion down to 1 V VCC, automatic battery switchover with 70 mV switchover threshold, 400 nA standby current in backup mode, and dual active-low/active-high RESET outputs for compatibility with diverse µP families.

Technical Context

The ADM8696ARW implements a dual-threshold comparator architecture: LLIN monitors VCC against a precision 1.3 V reference with ~12 mV hysteresis for noise immunity, while PFI provides independent early-warning power fail detection referenced to the same 1.3 V bandgap. Its internal PMOS VOUT switch delivers up to 100 mA with <0.2 V dropout at full load, and battery switchover is triggered when VCC falls below VBATT by ≥70 mV during power-down or ≥50 mV during power-up.

Watchdog functionality uses a three-level WDI input (internally biased to 38% VCC) that resets on any transition; timeout is configurable via OSC SEL and OSC IN to select internal oscillator (100 ms or 1.6 s), external capacitor (e.g., 47 pF → 1.6 s), or external clock (4096 cycles). BATT ON provides logic-level control for external PNP pass transistors to extend VOUT drive beyond 100 mA.

Key Specifications

Pinout & Package

ADM8696ARW is housed in a 16-pin SOIC (R-16) package with 1.27 mm pitch, RoHS-compliant, and rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX696CSA+ and TPS3823DBVR, ADM8696ARW uniquely integrates battery switchover, adjustable 1.3 V monitoring, and configurable watchdog in one SOIC package-enabling compact, self-contained µP supervision without external components.

Availability

ADM8696ARW is available at Aetrix Electronics and suitable for industrial PLC control, automotive telematics modules, medical diagnostic equipment, and network router management controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADM8696ARW 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.

The ADM8696ARW belongs to Analog Devices' microprocessor supervisory IC product line, designed specifically for robust power monitoring, battery-backed memory retention, and firmware integrity assurance in mission-critical embedded systems.

FAQ

What is the minimum VCC voltage at which ADM8696ARW asserts RESET?

The ADM8696ARW guarantees RESET assertion down to 1 V VCC, ensuring reliable microprocessor hold-down even during severe brownout conditions. This specification is verified across the full industrial temperature range (–40°C to +85°C) and is independent of VBATT voltage. The ADM8696ARW maintains functional reset generation as long as VCC remains above 1 V, making it suitable for applications with unstable or marginally regulated supplies.

How does ADM8696ARW handle battery switchover between VCC and VBATT?

The ADM8696ARW automatically switches VOUT from VCC to VBATT when VCC falls below VBATT by ≥50 mV during power-down or ≥70 mV during power-up, with 20 mV hysteresis to prevent oscillation. In battery backup mode, VOUT is connected to VBATT via a low-dropout PMOS switch, delivering up to 250 µA at <5 mV dropout. The BATT ON output goes high to indicate VBATT is active and can directly drive an external PNP transistor for higher current loads.

Can ADM8696ARW generate both active-low and active-high RESET signals?

Yes, ADM8696ARW provides two complementary RESET outputs: an active-low RESET pin (Pin 15) and an active-high RESET pin (Pin 16). Both are asserted simultaneously during low-line detection or watchdog timeout. The active-high RESET is the logical inverse of the active-low version, eliminating the need for external inverters when interfacing with microprocessors requiring high-active reset inputs.

What are the watchdog timeout options supported by ADM8696ARW?

The ADM8696ARW supports three watchdog timeout configurations: (1) 100 ms short period, (2) 1.6 s long period, and (3) user-adjustable period via external capacitor on OSC IN or external clock signal. OSC SEL selects the mode: high/floating enables internal oscillator (100 ms or 1.6 s), while low enables external timing. Immediately after reset, the timeout defaults to 1.6 s to accommodate processor initialization, then switches to the configured short period on first WDI transition.

Is ADM8696ARW compatible with lithium coin-cell backup batteries?

Yes, ADM8696ARW is fully compatible with lithium coin-cell batteries (e.g., CR2032). Its battery standby current is specified at 0.4 µA typical, enabling >10-year backup life. The device sources a safe charging current of ≤0.1 µA from VBATT, which is well within the maximum recommended charge rate for lithium cells. No external charging circuitry is required, and VBATT may be left unconnected if backup is not used.