Analog Devices Inc./Maxim Integrated MAX6348XR46-T

Overview

MAX6348XR46-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.63V power supplies and assert reset during brownout, power-up, and power-down events. It features a factory-trimmed 4.63V reset threshold (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current at 3V, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset assertion.

For engineers reviewing the MAX6348XR46-T datasheet, MAX6348XR46-T pinout, MAX6348XR46-T application, or MAX6348XR46-T equivalent, key selection criteria include open-drain output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), transient immunity against sub-200µs negative VCC glitches, guaranteed reset state down to 1.2V, and SC70-3 package suitability for space-constrained designs.

Technical Context

The MAX6348XR46-T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC falling below its 4.63V threshold. Its internal timing circuit ensures a minimum 100ms reset pulse width after VCC recovers, independent of temperature and supply variation.

As an open-drain device, it requires an external pull-up resistor on the RESET pin to interface with µPs having bidirectional reset inputs. It exhibits immunity to fast transients-rejecting negative-going VCC excursions up to 200µs when VCC drops 200mV below threshold-enabling robust operation in noisy power environments.

Key Specifications

Pinout & Package

MAX6348XR46-T is housed in a 3-pin SC70-3 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (marked "ACN" top-side).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6348UR46-T, the MAX6348XR46-T offers identical supervision functionality in a smaller SC70-3 package ideal for ultra-compact layouts; compared with TPS3808G33DBVR, it provides open-drain compatibility and precise 4.63V threshold essential for 5V-system brownout protection - neither alternative replicates both attributes simultaneously.

Availability

MAX6348XR46-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial microcontroller supervision, legacy 68HC11-based embedded systems, and low-power sensor node reset management requiring stable component supply and long-term lifecycle support.

Supply support for MAX6348XR46-T 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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX63xx family was designed specifically for ultra-low-power, precision voltage monitoring in microprocessor-based systems where reliability, small size, and minimal quiescent current are critical - targeting portable, battery-operated, and space-constrained embedded devices.

FAQ

What is the exact reset threshold voltage of the MAX6348XR46-T and how tightly is it specified?

The MAX6348XR46-T has a factory-trimmed nominal reset threshold of 4.63V. At +25°C, this is guaranteed within ±1.5% (4.56V to 4.70V). Over the full operating temperature range of -40°C to +85°C, the threshold remains within ±2.5% (4.51V to 4.75V), as confirmed in the Electrical Characteristics table. This precision eliminates need for external trimming or calibration in 5V system brownout detection.

Does the MAX6348XR46-T have a push-pull or open-drain RESET output, and why does that matter?

The MAX6348XR46-T features an open-drain active-low RESET output. This architecture allows direct connection to microprocessors with bidirectional reset pins (e.g., Motorola 68HC11) using only a single external pull-up resistor. Unlike push-pull outputs, it enables wired-OR reset bus configurations and avoids contention when multiple devices share a reset line - a key functional distinction from MAX6346/MAX6326 variants.

What is the minimum VCC voltage at which the MAX6348XR46-T guarantees correct reset behavior?

The MAX6348XR46-T guarantees correct reset assertion and release behavior down to VCC = 1.2V across the full -40°C to +85°C temperature range. This is explicitly stated in the General Description and verified in Absolute Maximum Ratings. Below 1.2V, the device may not maintain valid logic states - making it suitable for deep brownout detection in systems with wide-input DC-DC converters or aging batteries.

How long does the RESET signal remain active after VCC rises above the threshold in the MAX6348XR46-T?

The MAX6348XR46-T asserts RESET for a minimum of 100ms after VCC rises above the 4.63V threshold, with typical timeout of 185ms and maximum of 280ms (per Electrical Characteristics table). This guaranteed minimum ensures sufficient hold time for all common microprocessors to complete internal power-on initialization - no external RC timing network is required.

Is the MAX6348XR46-T compatible with lead-free PCB assembly processes?

Yes, the MAX6348XR46-T is supplied in RoHS-compliant, lead-free packaging. The "-T" suffix denotes tape-and-reel packaging with lead-free terminations. The device is rated for soldering at +300°C for 10 seconds (lead temperature), fully compatible with standard lead-free reflow profiles. For ordering lead-free versions, no suffix change is needed - "-T" already specifies lead-free construction per Maxim's packaging convention.