Analog Devices Inc. ADM1232AARNZ

Overview

ADM1232AARNZ from Analog Devices is a microprocessor supervisory circuit that monitors +5 V supply voltage, detects microprocessor lockup via 20 ns STROBE pulse detection, and provides dual reset outputs (active-high RESET and open-drain active-low RESET) with 250–1000 ms reset timeout. It supports 5% or 10% VCC trip tolerance and operates from −40°C to +85°C in 8-lead SOIC_N packaging. Used in embedded controllers and industrial computers for reliable power-on and watchdog reset.

For engineers reviewing the ADM1232AARNZ datasheet, ADM1232AARNZ pinout, ADM1232AARNZ application, or ADM1232AARNZ equivalent, key selection criteria include VCC trip accuracy (±5% or ±10%), STROBE timeout configurability (150/600/1200 ms), PB RESET debounce timing (20 ms min assertion), dual complementary reset outputs, and −40°C to +85°C industrial temperature rating.

Technical Context

The ADM1232AARNZ integrates a precision voltage monitor, a programmable watchdog timer with three STROBE timeout options (set by TD pin state), and a debounced push-button reset input. Its internal reference ensures stable 4.5–4.74 V (5%) or 4.25–4.49 V (10%) VCC trip points across temperature.

It delivers fast 20 ns STROBE pulse detection capability and guarantees RESET assertion within 50 μs of VCC falling below trip threshold. The dual-output architecture-RESET (push-pull, 8–10 mA sink/source) and RESET (open-drain, −8 to −12 mA sink)-enables flexible interface with TTL/CMOS logic and external pull-up requirements.

Key Specifications

Pinout & Package

ADM1232AARNZ is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, 3.9 mm × 4.9 mm body, 1.27 mm pitch). Pin 1 is marked with a beveled corner or dot; leads are gull-wing, RoHS-compliant (Z suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1232ESA+ and DS1232LPN+, ADM1232AARNZ offers lower quiescent current and dual-voltage-tolerance selection - critical for battery-powered and multi-rail industrial systems requiring configurable brown-out thresholds.

Availability

ADM1232AARNZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical infusion pumps requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM1232AARNZ 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.

The ADM1232A product line delivers cost-effective, integrated microprocessor supervisory solutions targeting industrial, automotive, and medical systems where reliability, low power, and configurable reset timing are essential.

FAQ

What is the VCC trip voltage tolerance setting method for ADM1232AARNZ?

The ADM1232AARNZ uses the TOLERANCE pin to select between two precision VCC trip points: connect TOLERANCE to GND for 5% tolerance (4.62 V nominal trip), or to VCC for 10% tolerance (4.37 V nominal trip). This selection is fully specified in the Rev. A datasheet Table 1 and determines the exact voltage at which RESET asserts during brown-out. The ADM1232AARNZ does not support intermediate or user-adjustable trip voltages.

How does the STROBE input function in ADM1232AARNZ?

The STROBE input in ADM1232AARNZ monitors microprocessor activity by detecting high-to-low transitions. If no transition occurs within the timeout period set by the TD pin (150/600/1200 ms), the device asserts RESET and RESET. It supports pulses as narrow as 20 ns, making ADM1232AARNZ compatible with high-speed CPUs. STROBE requires no external RC network - timing is internally generated and factory-trimmed.

What is the difference between RESET and RESET outputs on ADM1232AARNZ?

ADM1232AARNZ provides two complementary reset signals: RESET is an active-high push-pull output capable of sourcing and sinking up to 10 mA, while RESET is an active-low open-drain output rated for −12 mA sink current and requiring an external pull-up resistor. This dual-output architecture allows ADM1232AARNZ to interface directly with both CMOS and TTL logic families, and supports wired-OR configurations in multi-controller systems.

Can ADM1232AARNZ operate outside the standard +5 V supply range?

No - ADM1232AARNZ is specified only for operation from 4.5 V to 5.5 V. Its internal bandgap reference and comparator circuitry are optimized for +5 V nominal rails. Operation below 4.5 V risks unreliable trip point accuracy and undefined reset behavior; above 5.5 V exceeds absolute maximum ratings and may cause permanent damage. The ADM1232AARNZ is not rated for 3.3 V or wide-input voltage operation.

Is ADM1232AARNZ pin-compatible with other supervisory ICs?

Yes - ADM1232AARNZ is explicitly documented as pin-compatible with MAX1232 and DS1232LP devices. All share identical 8-pin SOIC_N pinout, function mapping, and electrical interface characteristics. However, users must verify TD pin behavior and STROBE timeout values against respective datasheets, as minor timing variations exist between manufacturers' implementations of the same functional architecture.