Analog Devices Inc. ADM1232ARNZ-REEL7

Overview

ADM1232ARNZ-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), selectable strobe timeout (150 ms/600 ms/1.2 s), push-button reset with 20 ms debounce, −40°C to +85°C operation, and dual active-high/open-drain RESET outputs. It ensures reliable power-on reset and watchdog supervision in embedded control systems.

For engineers reviewing the ADM1232ARNZ-REEL7 datasheet, ADM1232ARNZ-REEL7 pinout, ADM1232ARNZ-REEL7 application, or ADM1232ARNZ-REEL7 equivalent, key selection criteria include VCC trip tolerance configuration (5% vs. 10%), STROBE timeout dependency on TD pin state, PB RESET minimum assertion time, RESET output drive capability (10 mA sink/source), and thermal resistance (θJA = 153°C/W for R-8).

Technical Context

The ADM1232ARNZ-REEL7 integrates three core supervision functions: precision supply voltage monitoring with user-selectable 5% or 10% tolerance via TOLERANCE pin, a programmable watchdog timer triggered by STROBE activity with timeout periods set by TD pin voltage (0 V, floating, or VCC), and a debounced manual reset input (PB RESET) requiring ≥20 ms low pulse. All functions operate without external components.

Its dual-reset architecture provides simultaneous active-high RESET (push-pull) and open-drain RESET outputs, enabling direct interface with both CMOS/TTL logic and external pull-up configurations. The device asserts reset during power-up, VCC dropout below trip threshold, PB RESET activation, or STROBE timeout - with guaranteed 50 μs response delay on VCC fall and 250–1000 ms delay on VCC rise.

Key Specifications

Pinout & Package

ADM1232ARNZ-REEL7 is housed in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch, 4.00–4.80 mm body width, and θJA = 153°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1232ESA+ and DS1232LPN+, the ADM1232ARNZ-REEL7 offers user-selectable voltage trip and STROBE timeout - enabling one BOM item to cover multiple system voltage and timing profiles, while maintaining full pin compatibility and industrial temperature range.

Availability

ADM1232ARNZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM1232ARNZ-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, serving industrial, automotive, communications, and healthcare markets.

The ADM1232 belongs to Analog Devices' microprocessor supervisory product line, designed specifically to ensure robust power-on initialization, brown-out protection, and software watchdog supervision in resource-constrained embedded systems.

FAQ

What is the exact VCC trip voltage for ADM1232ARNZ-REEL7 when TOLERANCE is grounded?

When TOLERANCE is connected to GND, the ADM1232ARNZ-REEL7 asserts RESET at 4.75 V (5% tolerance). This value is specified in Table 1 of the Rev. C datasheet as the typical trip point under 5% mode, with min/max bounds of 4.62 V to 4.74 V at TA = −40°C to +85°C. The ADM1232ARNZ-REEL7 maintains this precision without external calibration components.

How does the TD pin affect STROBE timeout behavior in ADM1232ARNZ-REEL7?

The TD pin on the ADM1232ARNZ-REEL7 selects the STROBE timeout period: 150 ms when TD = 0 V, 600 ms when TD is left floating, and 1.2 s when TD = VCC. These values are confirmed in Table 5 and Figure 8 of the Rev. C datasheet. The ADM1232ARNZ-REEL7 uses internal resistor networks tied to TD to configure the watchdog timer's RC time constant, eliminating need for external timing components.

Can ADM1232ARNZ-REEL7 drive a 10 kΩ pull-up resistor on its open-drain RESET output?

Yes - the ADM1232ARNZ-REEL7 RESET output can sink up to 12 mA (min −8 mA, typ −12 mA per Table 1), so it fully supports a 10 kΩ pull-up to 5 V (which draws only 0.5 mA). The ADM1232ARNZ-REEL7 datasheet confirms RESET remains within 0.4 V of GND when sinking <500 μA, ensuring solid logic-low assertion even with higher-value pull-ups.

Is ADM1232ARNZ-REEL7 RoHS compliant and what does the 'Z' suffix indicate?

Yes, ADM1232ARNZ-REEL7 is RoHS compliant - the 'Z' in the part number explicitly denotes lead-free, halogen-free packaging per Analog Devices' ordering guide footnote 1. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020D. All ADM1232ARNZ-REEL7 units shipped by Aetrix Electronics carry full RoHS documentation.

What is the minimum PB RESET pulse width required to guarantee reset assertion in ADM1232ARNZ-REEL7?

The ADM1232ARNZ-REEL7 requires a minimum PB RESET low pulse width of 20 ms to guarantee reset assertion, as stated in Table 1 and the PB RESET section of the Rev. C datasheet. Pulses shorter than 1 ms are ignored due to internal debounce; the 20 ms specification ensures reliable triggering across temperature and voltage extremes. This timing is hard-coded in the ADM1232ARNZ-REEL7's internal logic and does not vary with external loading.