Analog Devices Inc. ADM6328-27ARTZ-R7

Overview

ADM6328-27ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, monitoring VCC with a precise 2.7 V threshold (±2.5% over −40°C to +85°C), 1 µA max supply current, and 100 ms minimum reset timeout - used to ensure reliable power-up sequencing in portable microprocessor systems.

For engineers reviewing the ADM6328-27ARTZ-R7 datasheet, ADM6328-27ARTZ-R7 pinout, ADM6328-27ARTZ-R7 application, or ADM6328-27ARTZ-R7 equivalent, this page delivers verified technical context, pin-level design meaning, real-world use cases, and validated alternative options for low-power brownout protection in space-constrained embedded designs.

Technical Context

The ADM6328-27ARTZ-R7 implements a precision voltage comparator with internal reference and glitch-immune timing logic to assert an active-low open-drain RESET signal when VCC drops below 2.7 V (±2.5%), holding it asserted for ≥100 ms after VCC recovers above threshold. It operates down to 1 V supply and supports fast transient immunity up to 100 V/µs.

Its open-drain output requires an external pull-up resistor and interfaces directly with bidirectional microprocessor reset pins, enabling shared reset control in multi-device systems. The device guarantees valid reset assertion within 20 µs of VCC falling below threshold and maintains reset functionality across the full −40°C to +85°C industrial temperature range.

Key Specifications

Pinout & Package

ADM6328-27ARTZ-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 compact PCB layouts and low-power handheld devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G12QDBVRQ1, ADM6328-27ARTZ-R7 offers optimal balance of ultra-low ICC, open-drain flexibility, and industrial temperature support in the smallest possible footprint - making it ideal for cost-sensitive, space-constrained portable designs where reset bus sharing is needed.

Availability

ADM6328-27ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, smart meter communication modules, and low-power wireless gateways requiring stable component supply with consistent parametric performance across temperature and volume production.

Supply support for ADM6328-27ARTZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets since 1965.

The ADM6328 series belongs to Analog Devices' single-supply voltage supervisor product line, designed specifically for ultralow-power, space-constrained microprocessor reset applications in portable and battery-operated systems.

FAQ

What is the exact reset threshold voltage of ADM6328-27ARTZ-R7 and how does it vary with temperature?

The ADM6328-27ARTZ-R7 has a nominal reset threshold of 2.7 V at 25°C, with guaranteed tolerance of ±2.5% over −40°C to +85°C (2.633 V to 2.768 V). Its temperature coefficient is 40 ppm/°C, resulting in predictable, monotonic drift - critical for stable brownout detection across environmental extremes. This specification is confirmed in Table 2 of the Rev. B datasheet.

Does ADM6328-27ARTZ-R7 require an external pull-up resistor, and what value is recommended?

Yes, ADM6328-27ARTZ-R7 features an active-low open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to VCC is typical and ensures proper logic-high level while limiting sink current to ≤1.6 mA during reset assertion. The datasheet specifies VOL ≤0.3 V at ISINK = 1.6 mA, validating this design choice for standard CMOS inputs.

Can ADM6328-27ARTZ-R7 operate reliably below 2.7 V, and down to what supply voltage does it maintain reset functionality?

Yes - ADM6328-27ARTZ-R7 remains fully functional down to VCC = 1.0 V, continuing to assert RESET as long as VCC stays below the 2.7 V threshold. This 1 V operational floor ensures robust reset hold during deep brownouts or capacitor discharge events, a key differentiator versus many competitors that cease operation above 1.5 V.

What is the reset timeout duration of ADM6328-27ARTZ-R7, and is it fixed or adjustable?

The ADM6328-27ARTZ-R7 provides a fixed minimum reset timeout of 100 ms, with typical duration of 185 ms and maximum of 280 ms over temperature. This internal timer is factory-trimmed and non-adjustable - ensuring consistent, predictable power-up delay without external components, simplifying design and reducing BOM count.

How does ADM6328-27ARTZ-R7 handle fast supply transients, and what is its glitch immunity specification?

ADM6328-27ARTZ-R7 provides built-in glitch immunity against negative-going VCC transients up to 100 V/µs, as specified in Absolute Maximum Ratings. Figure 5 in the datasheet quantifies immunity: for example, a 100 mV overdrive (VTH − VCC) can tolerate transients up to ~300 µs without spurious reset. This eliminates need for external RC filtering in noisy environments.