Analog Devices Inc. ADM1232ARNZ

Overview

ADM1232ARNZ from Analog Devices is a 5 V microprocessor supervisory circuit in an 8-lead narrow SOIC (R-8) package, featuring adjustable voltage trip points (4.5 V or 4.75 V), programmable strobe timeout (150 ms / 600 ms / 1.2 s), push-button reset with 20 ms debounce, and dual active-high/active-low RESET outputs. It monitors supply voltage, detects processor lockup via STROBE activity, and supports power-up reset in embedded controllers.

For engineers reviewing the ADM1232ARNZ datasheet, ADM1232ARNZ pinout, ADM1232ARNZ application, or ADM1232ARNZ equivalent, key selection criteria include its 5% or 10% VCC tolerance selection, open-drain RESET output requiring external pull-up, guaranteed reset assertion during VCC fall below trip point (50 µs delay), and compatibility with manual reset and watchdog timing functions in space-constrained industrial control systems.

Technical Context

The ADM1232ARNZ integrates three core monitoring functions: precision supply voltage detection using internal bandgap reference and comparator, a programmable watchdog timer triggered by STROBE edge transitions, and debounced manual reset input. Its TOLERANCE pin selects between 5% (4.75 V) and 10% (4.5 V) VCC trip thresholds by grounding or connecting to VCC.

RESET is a push-pull output capable of sourcing/sinking ≥8 mA, while RESET is an open-drain MOSFET output requiring external pull-up; both assert synchronously on VCC undervoltage, PB RESET activation, or STROBE timeout. The device operates across −40°C to +85°C with <50 µA quiescent current at CMOS logic levels.

Key Specifications

Pinout & Package

ADM1232ARNZ is packaged in an 8-lead narrow SOIC (R-8), 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1232ESA+ and DS1232LPZ-5+, ADM1232ARNZ offers lower quiescent current (20 µA vs. 100 µA), guaranteed industrial temperature performance, and flexible TD-configurable timeout-making it optimal for new designs prioritizing power efficiency, environmental robustness, and timing adaptability.

Availability

ADM1232ARNZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for ADM1232ARNZ 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The ADM1232 belongs to Analog Devices' microprocessor supervisory product line, engineered for reliable power-up sequencing, supply voltage monitoring, and watchdog-based fault recovery in industrial, automotive, and medical embedded systems.

FAQ

What is the function of the TD pin on the ADM1232ARNZ?

The TD pin on the ADM1232ARNZ configures the strobe timeout period: connecting TD to 0 V selects ~150 ms, leaving it floating selects ~600 ms, and tying it to VCC selects ~1.2 s. This determines the maximum time allowed between STROBE input high-to-low transitions before the ADM1232ARNZ asserts RESET. The setting directly impacts watchdog sensitivity in microprocessor supervision applications.

Does the ADM1232ARNZ require external components for basic operation?

No, the ADM1232ARNZ requires no external components for core supervision functionality. Its voltage reference, comparators, watchdog timer, and reset generators are fully integrated. Only the open-drain RESET output needs an external pull-up resistor; all other pins-including PB RESET, STROBE, TOLERANCE, and TD-operate correctly with direct MCU connections or simple biasing.

How does the TOLERANCE pin affect the ADM1232ARNZ reset threshold?

The TOLERANCE pin on the ADM1232ARNZ selects the VCC undervoltage trip point: grounding it sets a 5% tolerance (4.75 V nominal trip at 5 V supply), while connecting it to VCC sets a 10% tolerance (4.5 V nominal trip). This selection is implemented internally via resistor network switching and is specified across the full −40°C to +85°C operating range for the ADM1232ARNZ.

What is the difference between the RESET and RESET outputs of the ADM1232ARNZ?

RESET is an active-high push-pull output capable of sourcing and sinking ≥8 mA, requiring no external components. RESET is an active-low open-drain output that must be pulled up externally to function as a logic signal. Both outputs assert simultaneously during VCC undervoltage, PB RESET activation, or STROBE timeout, enabling interface flexibility with diverse host MCUs in the ADM1232ARNZ design.

Is the ADM1232ARNZ pin-compatible with the MAX1232 and DS1232LP?

Yes, the ADM1232ARNZ is explicitly pin-compatible with the MAX1232 and DS1232LP in the same 8-lead narrow SOIC (R-8) package. Pin functions-including PB RESET, TD, TOLERANCE, GND, RESET, RESET, STROBE, and VCC-match identically, allowing drop-in replacement in legacy designs without layout changes. This compatibility is confirmed in the ADM1232ARNZ datasheet Rev. C, Feature section.