Analog Devices Inc. ADM6348-42ARTZ-R7

Overview

ADM6348-42ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 4.2 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 ADM6348-42ARTZ-R7 datasheet, ADM6348-42ARTZ-R7 pinout, ADM6348-42ARTZ-R7 application, or ADM6348-42ARTZ-R7 equivalent, key selection criteria include its 4.2 V reset threshold tolerance, 1 µA max supply current at 3 V, open-drain output requiring external pull-up, glitch-immune operation against negative VCC transients, and compatibility with bidirectional microprocessor reset pins.

Technical Context

The ADM6348-42ARTZ-R7 implements a precision voltage comparator with internal reference and 100 ms minimum reset timeout timer. Its open-drain RESET output interfaces directly with microprocessors having bidirectional reset inputs, allowing either device to initiate system reset via shared pull-up configuration.

It features built-in glitch immunity against fast negative-going VCC transients up to 100 V/µs, with hysteresis of 9.5 mV and temperature coefficient of 40 ppm/°C - ensuring stable threshold behavior across industrial temperature range without external components.

Key Specifications

Pinout & Package

ADM6348-42ARTZ-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 applications.

Compared with MAX6326TUT42+T and TPS3808G33DBVR, ADM6348-42ARTZ-R7 uniquely combines 4.2 V precision threshold, true open-drain output, and sub-µA quiescent current in a 3-pin footprint - making it optimal for compact, battery-sensitive designs requiring robust reset arbitration.

Availability

ADM6348-42ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge gateways, and automotive telematics ECUs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for ADM6348-42ARTZ-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 ADM63xx family delivers ultralow-power, precision voltage supervisors targeting battery-operated and energy-constrained microprocessor systems - emphasizing accuracy, glitch immunity, and minimal board area.

FAQ

What is the exact reset threshold voltage of ADM6348-42ARTZ-R7 and how tightly is it specified?

The ADM6348-42ARTZ-R7 has a nominal reset threshold of 4.2 V, with guaranteed tolerance of ±2.5% over the full operating temperature range (−40°C to +85°C). At 25°C, the threshold is 4.137 V (min) to 4.263 V (max); across temperature, it shifts no more than ±0.105 V from nominal, supported by a 40 ppm/°C temperature coefficient.

Does ADM6348-42ARTZ-R7 require an external pull-up resistor, and what value is recommended?

Yes, ADM6348-42ARTZ-R7 features an active-low open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the host supply rail (e.g., 3.3 V or 5 V) is typical; values between 4.7 kΩ and 100 kΩ are acceptable depending on rise time and bus capacitance - confirmed in Analog Devices' Figure 8 application diagram.

Can ADM6348-42ARTZ-R7 operate reliably when the monitored VCC drops below 2.1 V?

Yes, ADM6348-42ARTZ-R7 remains fully functional down to VCC = 1.0 V. Its RESET output is guaranteed to stay asserted (low) and valid even at 1.2 V (with 100 µA sink capability) and 2.1 V (with 1.6 mA sink capability), enabling robust brownout detection far beyond typical logic-level thresholds.

How does ADM6348-42ARTZ-R7 handle fast power supply transients?

ADM6348-42ARTZ-R7 provides built-in glitch immunity against negative-going VCC transients up to 100 V/µs. Its internal comparator incorporates hysteresis (9.5 mV) and filtering to reject short-duration dips - validated in Figure 5 of the datasheet, which shows maximum transient duration vs. overdrive magnitude.

What is the power-up reset timeout behavior of ADM6348-42ARTZ-R7, and is it adjustable?

ADM6348-42ARTZ-R7 provides a fixed minimum reset timeout of 100 ms, with typical duration of 185 ms and maximum of 280 ms over temperature. This timeout is internally generated and not user-adjustable; it ensures sufficient stabilization time for microprocessors and peripherals before release from reset, as shown in Figure 9 timing diagram.