Analog Devices Inc. ADM13305-18ARZ-RL7

Overview

ADM13305-18ARZ-RL7 from Analog Devices is a dual-voltage supervisor IC for microprocessor and DSP power monitoring, featuring fixed 3.3 V and 1.8 V undervoltage detection thresholds (2.93 V and 1.68 V typical), 140 ms minimum reset timeout, 1.6 sec watchdog timer, and push-pull active-high and active-low RESET outputs. It operates from 2.7 V to 5.5 V supply and supports industrial temperature range (−40°C to +85°C) in portable computing and wireless systems.

For engineers reviewing the ADM13305-18ARZ-RL7 datasheet, ADM13305-18ARZ-RL7 pinout, ADM13305-18ARZ-RL7 application, or ADM13305-18ARZ-RL7 equivalent, key selection criteria include dual fixed-threshold supervision, watchdog timer tolerance to software lockup, manual reset input compatibility, and SOIC_N package suitability for space-constrained embedded designs.

Technical Context

The ADM13305-18ARZ-RL7 integrates two independent voltage comparators with hysteresis (30 mV at 2.93 V, 15 mV at 1.68 V), a 1.6 sec watchdog timer cleared by WDI transitions, and logic-controlled reset assertion/deassertion based on SENSE1/SENSE2 voltage levels relative to pretrimmed thresholds. Its internal reset timeout circuit ensures reliable power-on sequencing before processor release.

It features dual push-pull RESET outputs (active-low RESET and active-high RESET), manual reset input (MR) with 100 ns pulse width support, and supply current ≤40 μA across 2.7–5.5 V operation. RESET remains valid down to VDD = 1.1 V, enabling early fault detection during brownout conditions.

Key Specifications

Pinout & Package

ADM13305-18ARZ-RL7 uses an 8-lead narrow-body SOIC (SOIC_N, package code R-8) with 1.27 mm lead pitch and JEDEC MS-012-AA compliance. Thermal resistance θJA = 206°C/W supports operation without heatsinking in standard PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supervisor applications.

Compared with MAX6816ESE+ and TPS3808G33DBVR, ADM13305-18ARZ-RL7 uniquely delivers simultaneous 3.3 V/1.8 V supervision, integrated watchdog, and dual RESET polarity in a standard SOIC-8 - enabling consolidated power management in multi-rail embedded processors without design compromises.

Availability

ADM13305-18ARZ-RL7 is available at Aetrix Electronics and suitable for industrial control PLCs, notebook power management, wireless baseband modules, and embedded DSP systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM13305-18ARZ-RL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets with precision technology solutions.

The ADM13305 family was designed specifically for dual-rail microprocessor and DSP supervision in space- and power-constrained embedded systems, emphasizing accuracy, low quiescent current, and robust noise immunity.

FAQ

What is the exact undervoltage threshold for SENSE1 and SENSE2 on the ADM13305-18ARZ-RL7?

The ADM13305-18ARZ-RL7 has factory-trimmed thresholds: SENSE1 monitors at 2.93 V (typical, range 2.86–3.02 V) for a 3.3 V rail, and SENSE2 monitors at 1.68 V (typical, range 1.64–1.73 V) for a 1.8 V rail. These values are specified over −40°C to +85°C and include built-in hysteresis (30 mV and 15 mV respectively) to prevent chatter during slow voltage transitions.

Does the ADM13305-18ARZ-RL7 require external components to configure its supervision thresholds?

No, the ADM13305-18ARZ-RL7 does not require external resistors to set its supervision thresholds. As a fixed-threshold variant, it integrates precise internal references for both SENSE1 (2.93 V) and SENSE2 (1.68 V), eliminating calibration components and reducing layout complexity compared to adjustable-supervisor alternatives.

Can the watchdog timer in the ADM13305-18ARZ-RL7 be disabled, and how?

Yes, the watchdog timer in the ADM13305-18ARZ-RL7 can be disabled by leaving the WDI pin unconnected (floating). When WDI is open-circuit, the internal timer remains inactive and will not assert RESET regardless of processor activity - allowing full flexibility for systems that rely solely on power-on and manual reset functions.

What is the minimum VDD level at which ADM13305-18ARZ-RL7 guarantees valid RESET output behavior?

The ADM13305-18ARZ-RL7 guarantees RESET output validity down to VDD = 1.1 V. This means the device asserts RESET correctly during power-down sequences and maintains defined logic states even as the supply collapses, preventing metastability in downstream microcontrollers or FPGAs.

How does the ADM13305-18ARZ-RL7 handle simultaneous faults on both SENSE1 and SENSE2 inputs?

The ADM13305-18ARZ-RL7 asserts RESET whenever either SENSE1 or SENSE2 falls below its respective threshold - including simultaneous faults. Its functional truth table confirms that RESET goes low (and RESET goes high) if either input is low, providing fail-safe supervision without requiring OR-gating logic external to the ADM13305-18ARZ-RL7.