Analog Devices Inc. ADM6348-45ARTZ-R7

Overview

ADM6348-45ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 4.5 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 ADM6348-45ARTZ-R7 datasheet, ADM6348-45ARTZ-R7 pinout, ADM6348-45ARTZ-R7 application, or ADM6348-45ARTZ-R7 equivalent, key selection criteria include open-drain output compatibility with bidirectional MCU reset pins, guaranteed RESET assertion down to 1 V VCC, glitch immunity against negative-going transients, and precise 4.5 V threshold with 9.5 mV hysteresis.

Technical Context

The ADM6348-45ARTZ-R7 implements a precision bandgap-based voltage comparator with internal 100 ms (min) / 185 ms (typ) reset timeout timer and active-low open-drain RESET output requiring external pull-up. It asserts RESET within 20 µs when VCC falls below 4.432 V (min) at −40°C or 4.567 V (max) at +85°C.

Its design supports brownout detection down to 1 V VCC while maintaining valid logic levels, and features 40 ppm/°C temperature coefficient and 9.5 mV hysteresis to prevent chatter during threshold crossings-critical for stable operation in battery-powered and thermally varying environments.

Key Specifications

Pinout & Package

ADM6348-45ARTZ-R7 uses a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 2.90 mm × 1.30 mm footprint and 270°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–T45 and TPS3808G33, ADM6348-45ARTZ-R7 uniquely combines 4.5 V precision threshold, open-drain output, and 3-pin SOT-23 footprint-enabling minimal BOM count and direct drop-in replacement where 4.5 V rail supervision with shared reset bus is required.

Availability

ADM6348-45ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM6348-45ARTZ-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, automotive, communications, and healthcare markets since 1965.

The ADM63xx series was developed specifically for ultralow-power, precision supply monitoring in space-constrained portable and embedded systems-emphasizing accuracy, glitch immunity, and minimal quiescent current.

FAQ

What is the exact reset threshold voltage tolerance for ADM6348-45ARTZ-R7 over temperature?

The ADM6348-45ARTZ-R7 has a nominal reset threshold of 4.5 V with ±2.5% tolerance over the full operating temperature range of −40°C to +85°C. At 25°C, the threshold is specified as 4.432 V (min) to 4.567 V (max); at temperature extremes, it shifts to 4.387 V (min) at −40°C and 4.612 V (max) at +85°C per Table 2 of the Rev. B datasheet.

Does ADM6348-45ARTZ-R7 require an external pull-up resistor, and what value is recommended?

Yes, ADM6348-45ARTZ-R7 features an active-low open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the monitored 4.5 V rail is typical; values between 4.7 kΩ and 100 kΩ are supported depending on rise time and bus loading requirements. The device sinks up to 1.6 mA when asserted, so ensure the chosen resistor maintains VOL ≤ 0.3 V under load.

Can ADM6348-45ARTZ-R7 operate reliably during deep brownout conditions below 2 V?

Yes, ADM6348-45ARTZ-R7 guarantees functional reset assertion down to VCC = 1.0 V. Its internal circuitry remains active and RESET remains valid (low) even as the monitored supply collapses, enabling safe shutdown sequencing in systems where backup power or energy harvesting sustains partial operation below 2 V.

What is the reset timeout behavior of ADM6348-45ARTZ-R7 during power-up?

On power-up, ADM6348-45ARTZ-R7 holds RESET low for a minimum of 100 ms, typically 185 ms, and up to 280 ms over temperature. This timeout begins when VCC rises above the reset threshold and ensures the 4.5 V rail and downstream circuitry stabilize before releasing the microprocessor from reset-critical for reliable boot in systems with slow-rising supplies or large decoupling capacitance.

How does ADM6348-45ARTZ-R7 handle fast negative transients on the VCC line?

ADM6348-45ARTZ-R7 provides built-in glitch immunity against negative-going VCC transients: it ignores pulses shorter than ~100 µs at 100 mV overdrive (per Figure 5), preventing false resets caused by switching noise or load-step artifacts. This is achieved through internal filtering and comparator hysteresis, not external RC networks.