Analog Devices Inc. ADM1232ARN-REEL7

Overview

ADM1232ARN-REEL7 from Analog Devices is a 5 V microprocessor supervisory circuit in an 8-lead narrow SOIC (R-8) package, featuring adjustable voltage monitoring (4.5 V or 4.75 V trip), programmable strobe timeout (150/600/1.2 s), push-button reset with 20 ms debounce, −40°C to +85°C operation, and dual active-high/active-low RESET outputs. It ensures reliable power-on reset and watchdog supervision in embedded control systems.

For engineers reviewing the ADM1232ARN-REEL7 datasheet, ADM1232ARN-REEL7 pinout, ADM1232ARN-REEL7 application, or ADM1232ARN-REEL7 equivalent, key selection criteria include VCC trip tolerance selection (5% or 10%), STROBE timeout configuration via TD pin, open-drain RESET output drive capability, PB RESET debounce timing, and compatibility with legacy MAX1232/DS1232 designs.

Technical Context

The ADM1232ARN-REEL7 integrates three core supervision functions: precision supply voltage monitoring with selectable 5% or 10% tolerance thresholds, a programmable strobe watchdog timer whose timeout period (150 ms / 600 ms / 1.2 s) is set by the TD pin voltage level (GND/floating/VCC), and a debounced manual reset input (PB RESET) requiring ≥20 ms low assertion. All functions operate without external components.

Its dual RESET outputs provide complementary signaling: RESET is a push-pull output capable of sourcing 8–10 mA and sinking −8 to −12 mA, while RESET is an open-drain MOSFET requiring an external pull-up and sinking only. The device asserts reset on VCC drop below trip threshold, PB RESET activation, or STROBE inactivity beyond configured timeout - with guaranteed 50 μs delay on VCC fall and 250–1000 ms delay on VCC rise.

Key Specifications

Pinout & Package

ADM1232ARN-REEL7 is housed in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch, 5.00 × 4.00 mm body, and gull-wing leads. Pin 1 is marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1232ESA+ and DS1232LPZ-5+, the ADM1232ARN-REEL7 uniquely delivers full industrial temperature support, dual-trip voltage selection, and three-step programmable watchdog timeout - enabling one device to serve multiple µP platforms without redesign.

Availability

ADM1232ARN-REEL7 is available at Aetrix Electronics and suitable for industrial motor control, medical diagnostic equipment, automotive body control modules, programmable logic controllers, and portable instrumentation requiring stable component supply across long production lifecycles.

Supply support for ADM1232ARN-REEL7 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.

The ADM1232 belongs to Analog Devices' microprocessor supervisory IC product line, designed specifically to ensure robust power-on reset, supply voltage monitoring, and software watchdog functionality in resource-constrained embedded systems.

FAQ

What is the function of the TD pin on the ADM1232ARN-REEL7?

The TD pin on the ADM1232ARN-REEL7 selects the strobe timeout period: connecting TD to GND configures a 150 ms window, leaving it floating selects 600 ms, and tying it to VCC sets 1.2 s. This allows precise alignment of the watchdog timer with the host microprocessor's longest expected instruction cycle or task duration without external components. The ADM1232ARN-REEL7 uses this pin to determine how long STROBE inactivity triggers a reset.

Does the ADM1232ARN-REEL7 support both 5% and 10% VCC tolerance thresholds?

Yes, the ADM1232ARN-REEL7 supports both thresholds via the TOLERANCE pin: grounding it selects a 4.75 V trip point (5% below 5 V), while connecting it to VCC selects 4.5 V (10% below 5 V). This dual-threshold capability allows designers to optimize reset sensitivity for specific power supply regulation quality and noise margin requirements. The ADM1232ARN-REEL7 implements this selection internally with precision bandgap references.

How does the PB RESET input on the ADM1232ARN-REEL7 handle mechanical switch bounce?

The PB RESET input on the ADM1232ARN-REEL7 incorporates an internal debounce circuit that guarantees reset assertion only when the pin is held low for ≥20 ms, while ignoring all pulses shorter than 1 ms. This eliminates the need for external RC filters or firmware debouncing routines. The ADM1232ARN-REEL7 thus provides hardware-level reliability for manual reset events in noisy industrial environments.

What is the difference between the RESET and RESET outputs of the ADM1232ARN-REEL7?

The RESET output of the ADM1232ARN-REEL7 is a push-pull driver capable of sourcing up to 10 mA and sinking up to 12 mA, allowing direct connection to most microprocessor reset inputs. In contrast, RESET is an open-drain MOSFET output that sinks current only and requires an external pull-up resistor - enabling wired-OR reset bus configurations with multiple supervisors or peripherals. Both outputs are active simultaneously but with inverted logic states.

Is the ADM1232ARN-REEL7 pin-compatible with the MAX1232 and DS1232LP?

Yes, the ADM1232ARN-REEL7 is explicitly pin-compatible with the MAX1232 and Dallas DS1232LP in the same 8-lead narrow SOIC (R-8) package, sharing identical pin numbering, electrical behavior, and functional mapping. This allows direct substitution in existing designs without PCB layout changes. The ADM1232ARN-REEL7 maintains full functional equivalence while adding guaranteed −40°C to +85°C operation and consistent Analog Devices quality assurance.