Analog Devices Inc. ADM6326-28ARTZ-R7

Overview

ADM6326-28ARTZ-R7 from Analog Devices is a precision microprocessor reset circuit in a 3-lead SOT-23 package, providing active-low push-pull reset output with 2.8 V threshold voltage (±2.5% over −40°C to +85°C), 1 µA max supply current, and guaranteed reset assertion down to 1 V VCC. It ensures reliable power-up sequencing and brownout protection for low-power embedded systems.

For engineers reviewing the ADM6326-28ARTZ-R7 datasheet, ADM6326-28ARTZ-R7 pinout, ADM6326-28ARTZ-R7 application, or ADM6326-28ARTZ-R7 equivalent, this device delivers deterministic 100–280 ms reset timeout, glitch-immune monitoring of 2.8 V rails, and compatibility with microprocessor reset inputs requiring push-pull drive without external pull-up.

Technical Context

The ADM6326-28ARTZ-R7 integrates a precision voltage reference, comparator with hysteresis (6.3 mV), and internal 100 ms minimum reset timeout timer. Its push-pull output drives low to ≤0.3 V at 1.6 mA load when asserted, and high to ≥0.8 × VCC when deasserted - eliminating need for external pull-up resistors.

It operates across 1.0 V to 5.5 V supply range with ultralow ICC (≤1.0 µA at 3 V), supports fast transient immunity (20 µs response to VCC drop below 2.8 V), and maintains functional reset output down to 1 V VCC - enabling use in deep brownout detection scenarios.

Key Specifications

Pinout & Package

ADM6326-28ARTZ-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 MAX6326TRD28+T and TPS3123QDBVRQ1, the ADM6326-28ARTZ-R7 offers lowest ICC (1 µA) and identical push-pull drive, making it optimal for ultra-low-power portable and industrial systems where BOM simplicity and battery longevity are critical.

Availability

ADM6326-28ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication subsystems, and automotive body control module telematics interfaces requiring stable component supply and long-term lifecycle support.

Supply support for ADM6326-28ARTZ-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 consumer markets since 1965.

The ADM6326 series belongs to Analog Devices' precision voltage supervisor product line, designed specifically for reliable power-up, brownout, and reset management in low-power embedded systems with stringent current and timing requirements.

FAQ

What is the exact reset threshold voltage of ADM6326-28ARTZ-R7 and its tolerance?

The ADM6326-28ARTZ-R7 has a nominal reset threshold of 2.8 V, with guaranteed tolerance of ±2.5% over the full operating temperature range (−40°C to +85°C). At 25°C, the threshold is 2.758 V (min) to 2.842 V (max), and across temperature it spans 2.73 V to 2.87 V per Table 2 in the datasheet. This precision ensures consistent supervision of 2.8 V rails without margin-related false resets.

Does ADM6326-28ARTZ-R7 require an external pull-up resistor on the RESET pin?

No, ADM6326-28ARTZ-R7 does not require an external pull-up resistor because it features an active-low push-pull output. The RESET pin actively drives high (≥0.8 × VCC) when deasserted and low (≤0.3 V at 1.6 mA) when asserted. This eliminates the need for external components and simplifies interface to microcontrollers with dedicated reset inputs, unlike open-drain alternatives such as ADM6328-28ARTZ-R7.

What is the minimum VCC voltage at which ADM6326-28ARTZ-R7 continues to assert a valid RESET signal?

The ADM6326-28ARTZ-R7 guarantees valid RESET assertion down to VCC = 1.0 V. Even as the monitored supply collapses to 1 V, the device maintains correct logic state on the RESET pin - remaining low during undervoltage and transitioning cleanly upon recovery. This capability is critical for detecting deep brownout conditions in battery-powered systems where supply may dip below typical logic thresholds.

How long does the RESET signal remain asserted after power-up for ADM6326-28ARTZ-R7?

After VCC rises above the 2.8 V threshold, the ADM6326-28ARTZ-R7 holds RESET asserted for a guaranteed minimum of 100 ms, with typical duration of 185 ms and maximum of 280 ms. This timeout is internally generated and independent of external components, ensuring reliable microprocessor initialization across temperature and process variation without requiring external RC networks.

Is ADM6326-28ARTZ-R7 RoHS compliant and what package does it use?

Yes, ADM6326-28ARTZ-R7 is RoHS compliant (indicated by the "Z" suffix in the part number) and is packaged in a 3-lead SOT-23-3 (JEDEC TO-236-AB, Analog Devices package code RT-3). The package measures 2.90 mm × 1.30 mm × 1.02 mm and is compatible with standard surface-mount reflow processes, supporting high-density PCB designs in space-constrained applications.