Analog Devices Inc. ADM6328-23ARTZ-R7

Overview

ADM6328-23ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 2.32 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C. It asserts an active-low RESET signal within 20 µs of VCC falling below threshold, holds reset for ≥100 ms on power-up, and operates down to 1 V supply-enabling reliable startup and brownout protection in portable microprocessor systems.

For engineers reviewing the ADM6328-23ARTZ-R7 datasheet, ADM6328-23ARTZ-R7 pinout, ADM6328-23ARTZ-R7 application, or ADM6328-23ARTZ-R7 equivalent, key selection criteria include its 2.32 V reset threshold, 1 µA max supply current at 3 V, open-drain output requiring external pull-up, 100 ms minimum reset timeout, and guaranteed operation down to 1 V VCC-critical for battery-powered and low-voltage embedded designs.

Technical Context

The ADM6328-23ARTZ-R7 implements a precision voltage comparator with built-in hysteresis (6.3 mV) and a 100 ms–280 ms programmable reset timeout timer. Its open-drain RESET output interfaces directly with bidirectional microprocessor reset pins, enabling shared reset arbitration without additional logic.

Glitch immunity is achieved via transient rejection circuitry that tolerates negative-going VCC transients up to 200 mV overdrive for durations under 1 µs, as verified in Figure 5 of the datasheet. The device draws only 1 µA typical supply current at 3 V, making it suitable for always-on monitoring in energy-constrained systems.

Key Specifications

Pinout & Package

ADM6328-23ARTZ-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 MAX6326LT23D2T+ and TPS3808G12QDBVRQ1, ADM6328-23ARTZ-R7 delivers exact 2.32 V supervision with open-drain flexibility and lowest quiescent current-making it optimal for unmodified 2.3 V rail monitoring in space- and power-constrained designs where reset bus sharing is needed.

Availability

ADM6328-23ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless sensor nodes, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for ADM6328-23ARTZ-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, automotive, communications, and healthcare markets since 1965.

The ADM6328-23ARTZ-R7 belongs to Analog Devices' single-supply voltage supervisor family, engineered specifically for ultralow-power, precision reset generation in battery-operated and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of ADM6328-23ARTZ-R7, and how tightly is it specified?

The ADM6328-23ARTZ-R7 has a nominal reset threshold of 2.32 V at 25°C, with a guaranteed tolerance of ±2.5% over the full −40°C to +85°C operating range (2.262 V to 2.375 V). This specification is confirmed in Table 2 of the Rev. B datasheet and applies directly to the ADM6328-23ARTZ-R7 variant-not inferred from adjacent part numbers.

Does ADM6328-23ARTZ-R7 require an external pull-up resistor, and what value is recommended?

Yes, ADM6328-23ARTZ-R7 features an open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the monitored VCC rail (or a higher logic rail) is standard practice, ensuring VOL ≤ 0.3 V at ISINK = 1.6 mA while minimizing standby current-per the "RESET OUTPUT VOLTAGE LOW" spec in Table 1.

Can ADM6328-23ARTZ-R7 operate reliably when the monitored supply drops below 2.0 V?

Yes, ADM6328-23ARTZ-R7 remains fully functional down to 1.0 V VCC, with RESET asserted and valid output behavior guaranteed per the Absolute Maximum Ratings and General Description. Its ability to supervise collapsing rails makes it suitable for end-of-battery detection in energy-harvesting and backup power systems.

What is the minimum reset timeout period for ADM6328-23ARTZ-R7, and is it fixed or adjustable?

The ADM6328-23ARTZ-R7 provides a fixed minimum reset timeout of 100 ms, with typical and maximum values of 185 ms and 280 ms respectively. This timing is internally generated and non-adjustable-ensuring consistent power-up stabilization across all units without external components.

How does ADM6328-23ARTZ-R7 handle fast voltage transients on the VCC line?

ADM6328-23ARTZ-R7 incorporates built-in glitch immunity that rejects negative-going VCC transients up to 200 mV overdrive for pulse widths under 1 µs, as characterized in Figure 5 of the datasheet. This prevents false resets caused by switching noise or coupling spikes without compromising response speed to genuine brownouts.