Analog Devices Inc. ADM802MANZ

Overview

ADM802MANZ from Analog Devices is a precision microprocessor supervisory circuit providing reset generation, battery switchover, watchdog timer, and power-fail detection in a single 8-pin SOIC package. It asserts active-low RESET at 4.40 V threshold with 200 ms timeout, supports VCC down to 1 V during reset hold, and delivers ±2% power-fail accuracy via 1.25 V internal reference. It is used in industrial controllers requiring reliable brownout recovery and nonvolatile memory backup.

For engineers reviewing the ADM802MANZ datasheet, ADM802MANZ pinout, ADM802MANZ application, or ADM802MANZ equivalent, key selection criteria include its 4.4 V reset threshold (M-grade), 1.6 s watchdog timeout, battery switchover hysteresis of 40 mV, guaranteed operation from –40°C to +85°C, and compatibility with 3 V backup sources for CMOS RAM retention.

Technical Context

The ADM802MANZ integrates four core functions: a precision voltage monitor with 4.40 V reset threshold (±2% over temperature), a 1.6 s watchdog timer triggered by WDI transitions, an automatic battery switchover circuit 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.

Its internal architecture uses an epitaxial CMOS process enabling 100 µA quiescent current and 0.05 µA battery-backup supply current. RESET remains functional down to VCC = 1 V, and VOUT delivers up to 250 mA in normal mode with <1 Ω on-resistance, while switching to VBATT with <50 mV dropout in backup mode.

Key Specifications

Pinout & Package

ADM802MANZ is housed in an 8-lead SOIC (SO-8) package measuring 4.90 mm × 3.90 mm × 1.75 mm, with standard 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant and rated for industrial temperature operation (–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 ADM802LARN and MAX802MESA+, the ADM802MANZ uniquely combines 4.40 V reset threshold, ±2% PFI accuracy, and 200 ms reset timeout in a single industrial-grade SOIC device-making it optimal for cost-sensitive, high-reliability 5 V systems needing precise brownout response and robust backup management.

Availability

ADM802MANZ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, energy meters with tamper detection, and embedded computing modules requiring stable component supply across extended temperature ranges.

Supply support for ADM802MANZ 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 ADM802M series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust power monitoring and fail-safe recovery in mission-critical embedded systems operating under variable supply conditions.

FAQ

What is the exact reset voltage threshold for ADM802MANZ?

The ADM802MANZ 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 across the full –40°C to +85°C operating range. This value is confirmed in the device's official specifications table and distinguishes it from the 4.65 V threshold of the ADM802L variant.

Does ADM802MANZ support battery backup for CMOS RAM?

Yes, ADM802MANZ provides fully integrated battery switchover functionality. When VCC falls below the reset threshold and VBATT exceeds VCC by >20 mV, the internal PMOS switch connects VBATT to VOUT, sustaining power to attached CMOS RAM. The switchover hysteresis is 40 mV, and typical battery standby current is 0.05 µA.

Can the watchdog timer in ADM802MANZ be disabled?

Yes, the watchdog timer in ADM802MANZ is disabled by leaving the WDI pin floating or connecting it to a high-impedance (three-state) logic output. No external pull-up or pull-down is required. When disabled, the RESET output responds only to VCC threshold violations and power-fail events.

What is the accuracy of the power-fail detector in ADM802MANZ?

The ADM802MANZ guarantees ±2% accuracy for its power-fail detector (PFI/PFO), referencing an internal 1.25 V bandgap. This specification applies specifically to the ADM802M grade and enables precise early-warning detection of supply collapse using external resistor dividers-unlike the ADM692A or MAX802M which lack this tight tolerance.

Is ADM802MANZ pin-compatible with other devices in the family?

Yes, ADM802MANZ is pin-compatible with all members of the ADM690A/ADM692A/ADM802L/M/ADM805L/M family in the same SO-8 package, including ADM802LARN, ADM692AARN, and ADM805MARN. Pin functions, layout, and PCB footprint are identical-only reset threshold, PFI accuracy, and RESET polarity differ between variants.