Analog Devices Inc. ADM1232ARW

Overview

ADM1232ARW from Analog Devices is a 5 V microprocessor supervisory circuit in a 16-lead SOIC_W (RW-16) package, featuring adjustable voltage monitoring (4.5 V or 4.75 V trip), selectable strobe timeout (150 ms / 600 ms / 1.2 s), push-button reset debouncing, and dual active-high/active-low RESET outputs. It monitors supply voltage integrity, detects microprocessor lockup via STROBE activity, and supports manual reset in embedded controllers and industrial computers.

For engineers reviewing the ADM1232ARW datasheet, ADM1232ARW pinout, ADM1232ARW application, or ADM1232ARW equivalent, key selection criteria include its 5% or 10% VCC tolerance setting, open-drain RESET output requiring external pull-up, guaranteed 20 ms PB RESET assertion time, and −40°C to +85°C industrial temperature range.

Technical Context

The ADM1232ARW integrates three core supervision functions: precision VCC threshold detection with TOLERANCE pin-selectable 5% (4.75 V) or 10% (4.5 V) trip points; watchdog-style STROBE monitoring with TD pin-configurable timeout periods (150 ms typical at TD = 0 V); and debounced PB RESET input rejecting glitches <1 ms while guaranteeing reset for >20 ms low pulses.

Its dual RESET outputs provide complementary signaling: RESET is push-pull capable of sourcing/sinking ≥8 mA, while RESET is open-drain requiring external pull-up and sinking ≥12 mA. The device operates with only 20–50 μA quiescent current and asserts reset within 50 μs of VCC falling below trip voltage.

Key Specifications

Pinout & Package

ADM1232ARW is packaged in a 16-lead wide SOIC (RW-16), 7.6 mm × 10.5 mm body, 1.27 mm pitch, JEDEC MS-013-AA compliant. Thermal resistance θJA = 73°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1232ESE+ and DS1232LPZ-10+, the ADM1232ARW offers lower 20 μA quiescent current, selectable 5%/10% tolerance, and three strobe timeout options - enabling tighter power budget control and flexible firmware watchdog tuning without layout changes.

Availability

ADM1232ARW is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical handheld devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ADM1232ARW 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.

The ADM1232 belongs to Analog Devices' microprocessor supervisory IC product line, designed specifically to replace discrete reset circuits in 5 V embedded systems with integrated voltage monitoring, watchdog, and reset generation.

FAQ

What is the function of the TD pin on the ADM1232ARW?

The TD pin on the ADM1232ARW selects the strobe timeout period: connecting TD to GND yields ~150 ms, leaving it floating yields ~600 ms, and tying it to VCC yields ~1.2 s. This determines the maximum allowable interval between high-to-low transitions on the STROBE input before the ADM1232ARW asserts RESET. The TD pin does not affect voltage monitoring or PB RESET behavior.

How does the TOLERANCE pin configure the VCC trip point for ADM1232ARW?

The TOLERANCE pin on the ADM1232ARW sets the supply voltage threshold: grounding it selects a 5% tolerance (4.75 V trip at 5 V nominal), while connecting it to VCC selects a 10% tolerance (4.5 V trip). This configuration is factory-trimmed and does not require external resistors. The ADM1232ARW guarantees trip accuracy within ±12 mV over temperature.

Can ADM1232ARW drive a reset line directly without external components?

Yes - the ADM1232ARW's RESET output is push-pull and can source/sink ≥8 mA, allowing direct connection to most microcontroller reset inputs. However, the open-drain RESET output requires an external pull-up resistor (typically 4.7 kΩ to VCC) to function as an active-low reset signal, especially when shared across multiple devices.

Is ADM1232ARW pin-compatible with MAX1232 and DS1232LP in the RW-16 package?

Yes - the ADM1232ARW uses the identical 16-lead SOIC_W (RW-16) pinout as the MAX1232 and DS1232LP, with matching pin functions including PB RESET (Pin 2), TD (Pin 4), TOLERANCE (Pin 6), GND (Pin 8), RESET (Pin 9), RESET (Pin 11), STROBE (Pin 13), and VCC (Pin 15). NC pins also align exactly.

What is the minimum PB RESET pulse width required to trigger reset on ADM1232ARW?

The ADM1232ARW requires a minimum 20 ms low pulse on the PB RESET pin to guarantee reset assertion, with internal debouncing rejecting any glitch shorter than 1 ms. This ensures robust manual reset operation in noisy environments. The ADM1232ARW maintains reset assertion for 250–1000 ms after PB RESET returns high, depending on VCC rise/fall conditions.