Analog Devices Inc. ADM6328-29ARTZ-R7

Overview

ADM6328-29ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 2.93 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 remains functional down to VCC = 1 V - enabling reliable startup and brownout protection in portable microprocessor systems.

For engineers reviewing the ADM6328-29ARTZ-R7 datasheet, ADM6328-29ARTZ-R7 pinout, ADM6328-29ARTZ-R7 application, or ADM6328-29ARTZ-R7 equivalent, key selection criteria include its 1 µA max supply current, open-drain output requiring external pull-up, 2.93 V reset threshold with 6.3 mV hysteresis, and guaranteed operation across industrial temperature range - all critical for low-power embedded reset supervision.

Technical Context

The ADM6328-29ARTZ-R7 implements a precision voltage comparator with internal reference and glitch-immune timing logic. Its open-drain RESET output interfaces directly with bidirectional microprocessor reset pins and supports wired-OR configurations. The device guarantees valid reset assertion down to VCC = 1 V and exhibits 40 ppm/°C temperature coefficient on threshold voltage.

It features built-in immunity to negative-going VCC transients up to 200 mV overdrive for durations under 1 µs (per Figure 5), and delivers a typical power-up reset timeout of 185 ms with ±100 ms variation over temperature. Reset deassertion occurs only after VCC exceeds 2.93 V and remains stable for ≥100 ms.

Key Specifications

Pinout & Package

ADM6328-29ARTZ-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 soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326TRD29+T and TPS3808G33DBVR, the ADM6328-29ARTZ-R7 offers lowest quiescent current and native open-drain compatibility with bidirectional reset architectures - making it optimal for space- and power-constrained designs where pin count and leakage budget are critical.

Availability

ADM6328-29ARTZ-R7 is available at Aetrix Electronics and suitable for telecommunications infrastructure, portable microprocessor systems, and industrial control applications requiring stable component supply, RoHS compliance, and long-term lifecycle support.

Supply support for ADM6328-29ARTZ-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, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The ADM632x series was developed specifically for ultralow-power, precision supply monitoring in battery-operated and space-constrained microprocessor systems - emphasizing sub-µA ICC, wide VCC range, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of ADM6328-29ARTZ-R7 and how does it vary with temperature?

The ADM6328-29ARTZ-R7 has a nominal reset threshold of 2.93 V at 25°C, with guaranteed range of 2.857 V to 3.00 V over −40°C to +85°C per Table 2. Its temperature coefficient is 40 ppm/°C, resulting in ≤±12 mV total drift across the full temperature range - sufficient for stable 2.93 V rail supervision without calibration.

Does ADM6328-29ARTZ-R7 require an external pull-up resistor, and what value is recommended?

Yes, ADM6328-29ARTZ-R7 features an open-drain RESET output and requires an external pull-up resistor. For ISINK = 1.6 mA at VCC > 2.1 V, a 10 kΩ resistor to 3.3 V yields ~1.7 V high-level voltage and <10 µA static current - balancing speed, noise immunity, and power efficiency in most microprocessor interfaces.

Can ADM6328-29ARTZ-R7 operate reliably during deep brownout conditions?

Yes, ADM6328-29ARTZ-R7 remains fully functional down to VCC = 1.0 V, asserting RESET as long as VCC stays below 2.93 V. Its internal circuitry continues accurate threshold comparison and timing generation even at 1 V, enabling fail-safe reset assertion during severe brownout events before downstream logic fails.

What is the power-up reset timeout behavior of ADM6328-29ARTZ-R7, and is it programmable?

The ADM6328-29ARTZ-R7 provides a fixed minimum reset timeout of 100 ms, with typical value of 185 ms and maximum of 280 ms over temperature. This timeout is internally generated and non-programmable - ensuring consistent, predictable release from reset without external components or configuration overhead.

How does ADM6328-29ARTZ-R7 handle fast negative transients on the VCC line?

ADM6328-29ARTZ-R7 incorporates glitch immunity that rejects negative-going VCC transients ≤200 mV in magnitude and ≤1 µs in duration (per Figure 5). This prevents false resets during switching regulator noise, ESD coupling, or cable hot-plug events - maintaining system stability without external RC filtering.