Analog Devices Inc. ADM692AANZ

Overview

ADM692AANZ from Analog Devices is a precision microprocessor supervisory circuit providing reset generation, watchdog timer, battery switchover, and power-fail detection in a single 8-lead SOIC package. It asserts active-low RESET at 4.40 V threshold with 200 ms timeout, monitors VCC down to 1 V, delivers up to 100 mA on VOUT, and supports CMOS RAM backup via VBATT switchover - used in industrial controllers and embedded instrumentation requiring reliable power sequencing.

For engineers reviewing the ADM692AANZ datasheet, ADM692AANZ pinout, ADM692AANZ application, or ADM692AANZ equivalent, key selection criteria include its 4.40 V reset threshold, 1.6 s watchdog timeout, battery switchover hysteresis of 40 mV, PFI comparator referenced to 1.25 V, and guaranteed operation from –40°C to +85°C.

Technical Context

The ADM692AANZ integrates four core functions: a precision voltage monitor with 4.40 V reset threshold (±0.15 V tolerance), a 1.6 s watchdog timer triggered by WDI transitions, automatic battery switchover with 20 mV power-down threshold and 40 mV hysteresis, and a dedicated 1.25 V reference-based power-fail comparator (PFI/PFO) with ±2% accuracy on related variants.

It operates across VCC = 4.5 V to 5.5 V and maintains RESET assertion down to VCC = 1 V; supply current is 100 µA typical in normal mode and 0.05 µA in battery backup mode. The internal PMOS switch connects VCC or VBATT to VOUT depending on relative voltage levels and reset state, supporting both RAM retention and system-level brownout recovery.

Key Specifications

Pinout & Package

ADM692AANZ is housed in an 8-lead SOIC (SO-8) package with standard 1.27 mm pitch, 5.00 mm × 6.20 mm footprint, and gull-wing leads. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX692AESA+, ADM692AANZ offers lower quiescent current and guaranteed 1 V reset hold; compared with TPS3823-44DBVR, it adds integrated battery switchover and PFI/PFO - making ADM692AANZ the sole choice for full-feature supervisory requirements in space-constrained SOIC layouts.

Availability

ADM692AANZ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADM692AANZ 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 ADM692AANZ belongs to Analog Devices' microprocessor supervisory circuit product line, designed specifically to consolidate reset, watchdog, battery backup, and power-fail monitoring into compact, industrial-grade ICs for embedded systems.

FAQ

What is the exact reset voltage threshold for ADM692AANZ?

The ADM692AANZ has a nominal reset voltage threshold of 4.40 V, with guaranteed minimum and maximum values of 4.25 V and 4.50 V respectively over the full –40°C to +85°C temperature range. This threshold is factory-trimmed and applies specifically to the ADM692A variant, distinguishing it from the 4.65 V threshold of the ADM690A series.

Does ADM692AANZ support battery backup for CMOS RAM?

Yes, ADM692AANZ supports automatic battery backup for CMOS RAM via its integrated switchover circuit. When VCC falls below the reset threshold and VBATT exceeds VCC by at least 20 mV, the internal PMOS switch connects VBATT to VOUT. In backup mode, VOUT delivers VBATT – 0.05 V at 250 µA, sustaining low-power memory with typical standby current under 0.1 µA.

Can the watchdog timer in ADM692AANZ be disabled?

Yes, the watchdog timer in ADM692AANZ can be disabled by leaving the WDI pin floating or connecting it to a high-impedance (three-state) logic output. When WDI is not actively toggled, the 1.6 s timeout does not activate, and RESET remains controlled solely by VCC level and power-fail conditions - confirmed in the functional block diagram and timing specifications.

What is the purpose of the PFI and PFO pins on ADM692AANZ?

The PFI (Power Fail Input) pin connects to a resistive divider monitoring an external supply rail; it compares that voltage against an internal 1.25 V reference. When PFI drops below 1.25 V, the PFO (Power Fail Output) pin goes low to signal imminent power loss - enabling µP interrupt-driven shutdown. This function is independent of reset and watchdog operations.

Is ADM692AANZ pin-compatible with other devices in its family?

Yes, ADM692AANZ is pin-compatible with ADM690A, ADM802M, and ADM805M in the same SO-8 package. All share identical pinout: VCC, VBATT, VOUT, GND, PFI, PFO, RESET, and WDI. This allows direct substitution where the 4.40 V reset threshold and industrial temperature grade meet design requirements.