Analog Devices Inc. ADM13305-4ARZRL7

Overview

ADM13305-4ARZRL7 from Analog Devices is a dual-voltage supervisor IC designed to monitor a fixed 3.3 V supply (SENSE1) and an externally adjustable 0.6 V reference (SENSE2) in microprocessor and DSP systems. It provides both active-high and active-low push-pull reset outputs, features a 1.6 sec watchdog timer, guarantees RESET assertion down to VDD ≥ 1.1 V, and operates across −40°C to +85°C in an 8-lead SOIC_N package.

For engineers reviewing the ADM13305-4ARZRL7 datasheet, ADM13305-4ARZRL7 pinout, ADM13305-4ARZRL7 application, or ADM13305-4ARZRL7 equivalent, key selection criteria include dual-threshold supervision with one programmable input, 140 ms minimum reset timeout, low 40 μA supply current, and compatibility with industrial-grade power sequencing and fault recovery in embedded control systems.

Technical Context

The ADM13305-4ARZRL7 implements two independent voltage monitoring channels: SENSE1 uses an internal 2.93 V threshold for 3.3 V rail supervision, while SENSE2 accepts an external resistor divider to scale higher voltages down to its 0.6 V reference. Its watchdog logic resets on WDI pin transitions, with a typical 1.6 sec timeout and disable capability via floating WDI.

Reset assertion is synchronized to power-up (valid from VDD ≥ 1.1 V), includes 140–280 ms timeout delay, and supports manual reset via MR pin with guaranteed deassertion timing. Both RESET and RESET outputs are push-pull, eliminating need for external pull-ups and enabling direct interface to diverse processor reset inputs.

Key Specifications

Pinout & Package

ADM13305-4ARZRL7 is housed in an 8-lead narrow-body SOIC package (SOIC_N, JEDEC MS-012-AA, R-8), measuring 4.90 mm × 3.90 mm × 1.75 mm, with standard 1.27 mm lead pitch and RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EUK+T and TPS3808G33DBVR, the ADM13305-4ARZRL7 uniquely delivers integrated dual-rail supervision with one programmable input and on-chip watchdog-reducing component count, PCB area, and firmware complexity in systems requiring coordinated reset of heterogeneous power domains.

Availability

ADM13305-4ARZRL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, wireless baseband modules, notebook embedded controllers, and portable medical diagnostic devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM13305-4ARZRL7 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 precision instrumentation, industrial automation, communications, and healthcare markets.

The ADM13305 family was engineered for robust power-supply monitoring in microprocessor-based systems, emphasizing dual-rail coordination, low quiescent current, and fail-safe watchdog functionality in harsh operating environments.

FAQ

What is the exact voltage threshold monitored by SENSE1 on the ADM13305-4ARZRL7?

The ADM13305-4ARZRL7 monitors SENSE1 at a fixed internal threshold of 2.93 V (typical), with a specified range of 2.90 V to 2.98 V over −40°C to +85°C. This is pretrimmed for accurate supervision of standard 3.3 V power rails and includes built-in hysteresis of 30 mV to prevent chatter near the trip point. The value is confirmed in Table 2 of the ADM13305 Rev. 0 datasheet.

Can the ADM13305-4ARZRL7 supervise a 5 V supply, and how is it configured?

Yes, the ADM13305-4ARZRL7 can supervise a 5 V supply using the SENSE2 input with an external resistor divider. Since SENSE2 references a fixed 0.6 V internal threshold, a divider ratio of 5 V / 0.6 V ≈ 8.33 is applied-e.g., R1 = 73.3 kΩ and R2 = 10 kΩ. This configuration is explicitly supported in the Ordering Guide and Theory of Operation section of the ADM13305-4ARZRL7 datasheet.

Does the ADM13305-4ARZRL7 require external pull-up resistors on its RESET and RESET outputs?

No, the ADM13305-4ARZRL7 features push-pull outputs on both RESET (active-low) and RESET (active-high), eliminating the need for external pull-up resistors. Each output can source up to 5 mA and sink up to 5 mA, enabling direct connection to microcontroller reset pins regardless of logic polarity. This is verified in the "RESET OUTPUT" section and Absolute Maximum Ratings table of the ADM13305-4ARZRL7 datasheet.

What is the watchdog timeout behavior of the ADM13305-4ARZRL7, and how is it disabled?

The ADM13305-4ARZRL7 watchdog has a typical timeout of 1.6 sec, with a range of 1.1–2.3 sec. It is cleared on any edge (rising or falling) at the WDI pin. To disable the watchdog, the WDI pin must be left floating-no external tie-high or tie-low is required. This behavior is documented in the "WATCHDOG TIMER" section and Functional Truth Table of the ADM13305-4ARZRL7 datasheet.

How does the ADM13305-4ARZRL7 behave during power-up when VDD rises from 0 V?

The ADM13305-4ARZRL7 asserts RESET as soon as VDD reaches 1.1 V, ensuring early fault detection before full power stabilization. Once VDD exceeds the operating range (2.7 V), the device begins monitoring SENSE1 and SENSE2. If both inputs exceed their respective thresholds, RESET remains asserted for the full 140 ms minimum timeout before deassertion-guaranteeing safe processor release. This sequence is defined in the General Description and Reset Timing Diagram (Figure 14) of the ADM13305-4ARZRL7 datasheet.