Analog Devices Inc. ADM6328-22ARTZ-R7

Overview

ADM6328-22ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, monitoring 2.2 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C, 1 µA max supply current, and 100 ms minimum reset timeout-used for reliable power-up sequencing in portable microprocessor systems.

For engineers reviewing the ADM6328-22ARTZ-R7 datasheet, ADM6328-22ARTZ-R7 pinout, ADM6328-22ARTZ-R7 application, or ADM6328-22ARTZ-R7 equivalent, key selection criteria include open-drain output compatibility with bidirectional MCU reset pins, glitch-immune brownout detection down to 1 V VCC, and SOT-23 footprint constraints in space-constrained embedded designs.

Technical Context

The ADM6328-22ARTZ-R7 implements a precision voltage comparator with internal reference and 100 ms reset timeout timer. Its open-drain RESET output requires an external pull-up resistor and remains functional down to VCC = 1 V, enabling system reset assertion during deep brownout conditions.

It features 40 ppm/°C temperature coefficient on the 2.2 V threshold, 6.3 mV hysteresis, and immunity to negative-going VCC transients up to 200 mV overdrive-ensuring robust operation in noisy power environments without spurious resets.

Key Specifications

Pinout & Package

ADM6328-22ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 2.9 mm × 1.3 mm footprint and 1.0 mm height, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–22DUR-T and TPS3808G01QDBVRQ1, ADM6328-22ARTZ-R7 uniquely delivers open-drain output in a fixed 2.2 V variant with lowest ICC-making it optimal for space- and energy-constrained systems needing shared reset bus capability without external components.

Availability

ADM6328-22ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, low-power wireless gateways, and automotive body control modules requiring stable component supply and RoHS-compliant packaging.

Supply support for ADM6328-22ARTZ-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.

ADM6328-22ARTZ-R7 belongs to the ADM63xx family of ultralow-power reset supervisors, engineered specifically for reliable power-monitoring in battery-operated and noise-prone embedded systems where minimal current draw and glitch immunity are critical.

FAQ

What is the exact reset threshold voltage of ADM6328-22ARTZ-R7 and how tightly is it specified?

The ADM6328-22ARTZ-R7 has a nominal reset threshold of 2.2 V, with guaranteed tolerance of ±2.5% over the full operating temperature range (−40°C to +85°C). At 25°C, the threshold is 2.2 V ±1.5%, and the datasheet specifies min/max values of 2.167 V / 2.233 V (25°C) and 2.145 V / 2.25 V (−40°C to +85°C). This precision enables reliable monitoring of 2.2 V rails without calibration.

Does ADM6328-22ARTZ-R7 support operation below 2.2 V, and what happens to the RESET output?

Yes, ADM6328-22ARTZ-R7 remains fully functional down to VCC = 1.0 V. When VCC drops below 2.2 V, the open-drain RESET output is actively pulled low. Even at 1.0 V, the device guarantees VOL ≤ 0.4 V with 100 µA sink current-ensuring valid reset assertion during deep brownout events where other supervisors may fail.

What external components are required to use ADM6328-22ARTZ-R7?

ADM6328-22ARTZ-R7 requires only one external component: a pull-up resistor on the RESET pin. The value depends on bus capacitance and drive strength needs-typically 10 kΩ to 100 kΩ to VCC or another logic rail. No capacitors, resistors for threshold setting, or bypass components are needed, simplifying layout and reducing BOM count.

How does ADM6328-22ARTZ-R7 handle fast power supply transients?

ADM6328-22ARTZ-R7 provides built-in glitch immunity against negative-going VCC transients. It ignores pulses with magnitude ≤200 mV (relative to VTH) lasting ≤1 µs, as verified in Figure 5 of the datasheet. This prevents false resets caused by switching noise from DC/DC converters or motor drivers without requiring additional filtering components.

Is ADM6328-22ARTZ-R7 pin-compatible with other members of the ADM63xx family?

Yes, ADM6328-22ARTZ-R7 shares identical 3-lead SOT-23 (RT-3) pinout with all ADM6326/ADM6328/ADM6346/ADM6348 variants-including GND (Pin 1), RESET (Pin 2), and VCC (Pin 3). However, output structure differs: ADM6328-22ARTZ-R7 uses open-drain, while ADM6326 variants use push-pull-so direct substitution requires verifying reset bus topology compatibility.