Analog Devices Inc. ADM6328-25ARTZ-R7

Overview

ADM6328-25ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, monitoring 2.5 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 ADM6328-25ARTZ-R7 datasheet, ADM6328-25ARTZ-R7 pinout, ADM6328-25ARTZ-R7 application, or ADM6328-25ARTZ-R7 equivalent, key selection criteria include open-drain output compatibility with bidirectional reset pins, 2.5 V threshold tolerance across temperature, glitch immunity to negative VCC transients, and operation down to 1 V VCC for brownout detection.

Technical Context

The ADM6328-25ARTZ-R7 implements a precision bandgap-based voltage reference and comparator to monitor VCC against a fixed 2.5 V threshold (2.462 V min / 2.537 V max at 25°C), with 40 ppm/°C temperature coefficient and 6.3 mV hysteresis to prevent chatter during slow supply ramps.

Its open-drain RESET output requires an external pull-up resistor and asserts low within 20 µs when VCC falls below threshold; the internal timer guarantees RESET remains active for ≥100 ms (185 ms typical) after VCC rises above threshold, ensuring stable microprocessor initialization.

Key Specifications

Pinout & Package

ADM6328-25ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 270°C/W junction-to-ambient thermal resistance, surface-mount footprint (2.90 mm × 1.30 mm × 1.02 mm), and RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326LT25D3+T and TPS3808G12QDBVRQ1, ADM6328-25ARTZ-R7 offers optimal balance of ultra-low ICC, open-drain flexibility, and industrial temperature support in minimal 3-pin footprint-ideal where board space and battery life are primary constraints.

Availability

ADM6328-25ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge gateways, and automotive infotainment subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for ADM6328-25ARTZ-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.

The ADM6328 series belongs to Analog Devices' precision voltage supervisor product line, engineered specifically for ultralow-power, single-rail reset monitoring in space-constrained portable and industrial systems.

FAQ

What is the exact reset threshold voltage of ADM6328-25ARTZ-R7 at room temperature?

The ADM6328-25ARTZ-R7 has a nominal reset threshold of 2.5 V at 25°C, with a guaranteed range of 2.462 V (minimum) to 2.537 V (maximum) under those conditions. This 2.5 V specification is factory-trimmed and validated per Table 2 of the Rev. B datasheet, making ADM6328-25ARTZ-R7 suitable for precise supervision of 2.5 V logic rails.

Does ADM6328-25ARTZ-R7 require an external pull-up resistor on the RESET pin?

Yes, ADM6328-25ARTZ-R7 features an active-low open-drain RESET output (Pin 2), which mandates an external pull-up resistor to a valid logic supply (e.g., 2.5 V or 3.3 V). Typical values range from 10 kΩ to 100 kΩ; the device sinks up to 1.6 mA when asserted, so the resistor must be sized to maintain VOL ≤ 0.3 V under that load.

Can ADM6328-25ARTZ-R7 operate reliably when the monitored supply drops below 2.5 V?

Yes-ADM6328-25ARTZ-R7 remains fully functional down to VCC = 1.0 V, and its RESET output stays asserted (low) as long as VCC remains below the 2.5 V threshold. This capability ensures deterministic reset behavior during deep brownout events, a key requirement for fault-tolerant embedded systems using ADM6328-25ARTZ-R7.

What is the reset timeout duration of ADM6328-25ARTZ-R7, and is it adjustable?

The ADM6328-25ARTZ-R7 provides a fixed internal reset timeout of 100 ms minimum (185 ms typical, 280 ms maximum) after VCC rises above threshold. This timing is generated by an on-chip RC oscillator and is not user-adjustable; it is designed to exceed typical 2.5 V regulator stabilization times and guarantee safe microprocessor startup-no external components are needed to set ADM6328-25ARTZ-R7's timeout.

Is ADM6328-25ARTZ-R7 compatible with bidirectional microprocessor reset pins?

Yes-ADM6328-25ARTZ-R7's open-drain RESET output is explicitly designed for interfacing with bidirectional reset pins, as confirmed in the "Interfacing to Other Devices" section of the datasheet (Figure 8). When connected via a shared pull-up resistor, either the microprocessor or ADM6328-25ARTZ-R7 can assert reset, enabling coordinated system-level recovery without additional logic.