Analog Devices Inc. ADM1232ARMZ-REEL

Overview

ADM1232ARMZ-REEL from Analog Devices is a 5 V microprocessor supervisory circuit in an 8-lead MSOP package, featuring adjustable voltage monitoring (4.5 V or 4.75 V trip), programmable strobe timeout (150 ms / 600 ms / 1.2 s), push-button reset with 20 ms debounce, open-drain RESET and active-high RESET outputs, and operation from −40°C to +85°C - used for reliable power-on reset and watchdog supervision in embedded controllers.

For engineers reviewing the ADM1232ARMZ-REEL datasheet, ADM1232ARMZ-REEL pinout, ADM1232ARMZ-REEL application, or ADM1232ARMZ-REEL equivalent, this page provides verified pin functions, real-world timing behavior, tolerance configuration logic, reset assertion conditions, and validated alternatives for industrial microcontroller systems requiring deterministic power-up sequencing and lockup detection.

Technical Context

The ADM1232ARMZ-REEL integrates three core supervision functions: precision supply voltage monitoring with selectable 5% or 10% tolerance via TOLERANCE pin, a configurable watchdog timer triggered by STROBE edge transitions, and a debounced manual reset input (PB RESET) that guarantees reset assertion only after ≥20 ms low pulse. All functions operate without external components.

Its dual-reset architecture delivers both active-high RESET (push-pull, ±10 mA drive) and active-low RESET (open-drain, requires external pull-up), enabling direct interface with diverse microprocessor reset inputs. The TD pin selects strobe timeout period by setting bias current into an internal RC timebase, yielding three discrete timeout windows depending on TD voltage level.

Key Specifications

Pinout & Package

ADM1232ARMZ-REEL is housed in an 8-lead Mini Small Outline Package (MSOP, RM-8), 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, with exposed pad for thermal enhancement. Pin 1 marked by dot; pin count and layout match JEDEC MO-187-AA standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1232ESA+ and DS1232LPZ+, the ADM1232ARMZ-REEL offers RoHS-compliant packaging, guaranteed −40°C to +85°C operation, selectable voltage trip points, and three user-configurable strobe timeouts - making it the preferred choice for new industrial and automotive designs requiring flexibility and long-term supply stability.

Availability

ADM1232ARMZ-REEL 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, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ADM1232ARMZ-REEL 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM1232 belongs to Analog Devices' microprocessor supervisory IC product line, designed specifically to replace discrete reset circuits and provide robust, single-chip power monitoring and watchdog functionality for 5 V embedded systems.

FAQ

What is the function of the TD pin on the ADM1232ARMZ-REEL?

The TD pin on the ADM1232ARMZ-REEL selects the strobe timeout period by biasing an internal timebase. When TD = 0 V, timeout is 150 ms; when TD is floating, timeout is 600 ms; when TD = VCC, timeout is 1.2 s. This allows field-configurable watchdog behavior without external components - a key differentiator of the ADM1232ARMZ-REEL over fixed-timer alternatives.

Does the ADM1232ARMZ-REEL support both 4.5 V and 4.75 V reset thresholds?

Yes, the ADM1232ARMZ-REEL supports both thresholds via the TOLERANCE pin: connect TOLERANCE to VCC for a 4.5 V trip point (10% tolerance), or to GND for a 4.75 V trip point (5% tolerance). These values are specified in Table 1 of the datasheet and are factory-trimmed - the ADM1232ARMZ-REEL does not require external resistors to set either threshold.

Can the ADM1232ARMZ-REEL be used with 3.3 V microcontrollers?

No, the ADM1232ARMZ-REEL is a 5 V-only device: its VCC range is 4.5 V to 5.5 V, and its logic thresholds (e.g., VIH = 2.0 V) are defined relative to VCC. It cannot be powered from 3.3 V, nor does it translate 3.3 V logic levels. For 3.3 V systems, consider the ADM1232's successor family such as the ADM1085 or ADM1086, which support 3.3 V operation.

How does the PB RESET input handle mechanical switch bounce?

The PB RESET input on the ADM1232ARMZ-REEL includes an internal debounce circuit that ignores pulses shorter than 1 ms and guarantees reset assertion only when the pin is held low for ≥20 ms. This eliminates the need for external RC networks or firmware debouncing - a verified feature confirmed in the "PB RESET" section of the datasheet and validated across −40°C to +85°C.

Is the ADM1232ARMZ-REEL RoHS compliant?

Yes, the "Z" suffix in ADM1232ARMZ-REEL indicates RoHS compliance per EU Directive 2011/65/EU. This is explicitly stated in Note 1 of the Ordering Guide on Page 9 of the Rev. C datasheet, confirming lead-free terminations and compliant packaging - essential for export-controlled and environmentally regulated applications.