Analog Devices Inc. ADM6328-30ARTZ-R7

Overview

ADM6328-30ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, with a precise 3.0 V reset threshold (±2.5% over −40°C to +85°C), 1 µA max supply current at 3 V, and guaranteed reset assertion down to 1 V VCC - used for reliable power-up, brownout, and power-down monitoring in portable microprocessor systems.

For engineers reviewing the ADM6328-30ARTZ-R7 datasheet, ADM6328-30ARTZ-R7 pinout, ADM6328-30ARTZ-R7 application, or ADM6328-30ARTZ-R7 equivalent, key selection considerations include its open-drain output requiring external pull-up, 100 ms minimum reset timeout, glitch immunity against negative-going VCC transients, and compatibility with bidirectional microprocessor reset pins.

Technical Context

The ADM6328-30ARTZ-R7 implements a precision voltage comparator with built-in hysteresis (6.3 mV) and an internal 100–280 ms reset timeout timer. Its open-drain RESET output asserts low when VCC falls below 3.0 V (with ±2.5% tolerance over temperature) and remains asserted for ≥100 ms after VCC rises above threshold.

It operates across 1.0 V to 5.5 V supply range, draws ≤1.0 µA at 3 V, and maintains valid reset signaling down to VCC = 1 V. Glitch immunity is achieved via transient rejection circuitry that tolerates negative VCC excursions up to 200 mV for durations under 1 µs, per Figure 5.

Key Specifications

Pinout & Package

ADM6328-30ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 270°C/W junction-to-ambient thermal resistance, optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T-T and TPS3808G30DBVR, ADM6328-30ARTZ-R7 offers the lowest supply current (1 µA) and smallest footprint (SOT-23-3) among open-drain 3.0 V supervisors, making it optimal for ultra-low-power, space-constrained designs where reset bus sharing is required.

Availability

ADM6328-30ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge node gateways, and automotive infotainment subsystems requiring stable component supply with RoHS-compliant packaging and extended temperature support.

Supply support for ADM6328-30ARTZ-R7 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 healthcare markets since 1965.

The ADM6328 series belongs to Analog Devices' single-supply voltage supervisor product line, engineered specifically for ultralow-power, precision reset functionality in battery-operated and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of ADM6328-30ARTZ-R7 and how does it vary with temperature?

The ADM6328-30ARTZ-R7 has a nominal reset threshold of 3.00 V at 25°C, with guaranteed tolerance of ±2.5% over the full operating range of −40°C to +85°C. At temperature extremes, the threshold stays within 2.925 V (min) and 3.075 V (max), and its temperature coefficient is 40 ppm/°C - meaning drift is predictable and bounded for precision system design.

Does ADM6328-30ARTZ-R7 require an external pull-up resistor, and what value is recommended?

Yes, ADM6328-30ARTZ-R7 has an active-low open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the target logic rail (e.g., 3.3 V or 3.0 V) is typical; values from 4.7 kΩ to 100 kΩ are acceptable depending on bus capacitance and rise-time requirements. The device sinks up to 1.6 mA while asserted, ensuring robust low-state drive.

Can ADM6328-30ARTZ-R7 operate reliably when the monitored VCC drops below 2.0 V?

Yes, ADM6328-30ARTZ-R7 remains fully functional down to VCC = 1.0 V. Its RESET output stays asserted and valid even at 1.0 V, enabling fail-safe behavior during deep brownout. This capability is confirmed in the datasheet's "RESET OUTPUT VOLTAGE LOW" specification and Theory of Operation section, distinguishing it from many competitors that cease operation below 1.8 V.

What is the minimum reset timeout duration for ADM6328-30ARTZ-R7, and is it adjustable?

The ADM6328-30ARTZ-R7 provides a fixed minimum reset timeout of 100 ms, with typical duration of 185 ms and maximum of 280 ms over temperature. This timeout is internally generated and non-adjustable - it ensures sufficient time for power supply stabilization and oscillator startup before releasing the microprocessor from reset, eliminating need for external RC timing components.

How does ADM6328-30ARTZ-R7 handle fast voltage transients on the VCC line?

ADM6328-30ARTZ-R7 incorporates built-in glitch immunity that rejects negative-going VCC transients up to 200 mV amplitude for pulse widths under 1 µs, as characterized in Figure 5 of the datasheet. This prevents false resets caused by switching noise, ESD coupling, or load-step events - a key differentiator versus basic voltage detectors lacking transient filtering.