Analog Devices Inc. ADM13305-5ARZ

Overview

ADM13305-5ARZ from Analog Devices is a dual-voltage supervisor IC designed to monitor a fixed 2.5 V supply (SENSE1) and an externally adjustable 0.6 V reference (SENSE2) in microprocessor/DSP systems, providing both active-high and active-low push-pull reset outputs with 140 ms minimum timeout and 1.6 sec watchdog timer. It operates from 2.7 V to 5.5 V supply, draws ≤40 μA, and functions across −40°C to +85°C.

For engineers reviewing the ADM13305-5ARZ datasheet, ADM13305-5ARZ pinout, ADM13305-5ARZ application, or ADM13305-5ARZ equivalent, key selection criteria include its dual-threshold architecture (fixed + adjustable), guaranteed RESET assertion down to VDD ≥ 1.1 V, push-pull output drive capability, and SOIC_N package compatibility for industrial embedded power sequencing and fault recovery.

Technical Context

The ADM13305-5ARZ implements two independent undervoltage detection channels: SENSE1 uses an internally trimmed 2.25 V falling threshold (VIT−) with 30 mV hysteresis, while SENSE2 accepts an external resistor divider to scale any monitored voltage down to its 0.6 V reference point. Both inputs feed into transition-detection logic that triggers reset assertion on threshold violation.

Its integrated watchdog timer clears on any WDI edge transition and times out after 1.6 sec (typical) if unrefreshed; manual reset (MR) provides asynchronous override with 140–280 ms deassertion delay. The device guarantees functional reset behavior down to VDD = 1.1 V and supports simultaneous active-high (RESET) and active-low (RESET) outputs with push-pull drive.

Key Specifications

Pinout & Package

ADM13305-5ARZ is housed in an 8-lead narrow-body SOIC (SOIC_N, R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch, 5.00 mm × 4.00 mm body size, and 1.75 mm maximum height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EPA+ and TPS3808G33DBVR, ADM13305-5ARZ uniquely integrates dual independent voltage monitoring (one fixed, one scalable), push-pull dual-reset outputs, and configurable watchdog in a single SOIC-8 package-reducing BOM count and PCB area while enabling coordinated reset of heterogeneous subsystems.

Availability

ADM13305-5ARZ is available at Aetrix Electronics and suitable for industrial PLC control, portable medical devices, wireless baseband modules, and notebook embedded controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM13305-5ARZ 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, automotive, communications, and healthcare markets with precision technology solutions.

The ADM13305 family was engineered specifically for robust power-supply monitoring in DSP and microcontroller-based systems-emphasizing reliability under voltage transients, low quiescent current, and flexible threshold configuration for diverse rail architectures.

FAQ

What is the exact undervoltage threshold for SENSE1 on the ADM13305-5ARZ?

The ADM13305-5ARZ has a fixed SENSE1 falling threshold (VIT−) of 2.25 V (typical), with a guaranteed range of 2.20 V to 2.32 V across −40°C to +85°C. This threshold is factory-trimmed and does not require external components-designed specifically to supervise 2.5 V supplies with 30 mV hysteresis for noise rejection.

How does the adjustable SENSE2 input work on the ADM13305-5ARZ?

The ADM13305-5ARZ SENSE2 input references an internal 0.6 V precision bandgap. To monitor a higher voltage (e.g., 5 V), connect a resistor divider such that the divided voltage equals 0.6 V at the target trip point. For example, use R1 = 7.33 kΩ and R2 = 1 kΩ to set 5 V detection. The ADM13305-5ARZ datasheet Figure 13 defines the scaling equation.

Can the watchdog timer on the ADM13305-5ARZ be disabled?

Yes-the ADM13305-5ARZ watchdog timer is disabled when the WDI pin is left floating (high-impedance). No external pull-up or pull-down is required. When actively used, WDI must receive a logic edge (rising or falling) at least once every 1.6 sec (typical) to prevent reset assertion. This behavior is explicitly documented in the Theory of Operation section.

What are the absolute maximum ratings for VDD and SENSE inputs on the ADM13305-5ARZ?

The ADM13305-5ARZ has an absolute maximum VDD rating of −0.3 V to +6 V. SENSE1 and SENSE2 inputs tolerate −0.3 V to (VDD + 0.3 V), but must not exceed their respective threshold voltages by more than 0.3 V during transient events. Exceeding these limits risks permanent damage-designers should apply clamping or filtering per Analog Devices' recommended layout practices.

Does the ADM13305-5ARZ provide reset output validity during brownout conditions?

Yes-the ADM13305-5ARZ guarantees RESET and RESET output functionality down to VDD = 1.1 V. During power-down, the device continues asserting reset until VDD falls below this level, ensuring controlled shutdown of connected processors. This feature is confirmed in the General Description and Specifications tables of the ADM13305-5ARZ datasheet Rev. 0.