Analog Devices Inc./Maxim Integrated MAX6346XR34-T

Overview

MAX6346XR34-T from Maxim Integrated is a precision push-pull active-low microprocessor supervisory circuit designed to monitor 3.4V power supplies and assert reset during brownout, power-up, and power-down events. It features a factory-trimmed 3.400V reset threshold (±1.5% at +25°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates over -40°C to +85°C in SC70-3 packaging. It is used in portable battery-powered systems requiring reliable, low-power supply monitoring.

For engineers reviewing the MAX6346XR34-T datasheet, MAX6346XR34-T pinout, MAX6346XR34-T application, or MAX6346XR34-T equivalent, key selection criteria include its 3.4V threshold accuracy, push-pull active-low RESET output, SC70-3 footprint compatibility, and immunity to sub-100µs VCC transients - critical for stable µP initialization in space-constrained embedded designs.

Technical Context

The MAX6346XR34-T implements a precision bandgap-based voltage comparator with internal hysteresis (9.5mV) to detect VCC drops below its 3.400V threshold. Its reset assertion is latched and held for ≥100ms after VCC recovers, ensuring robust µP reset timing independent of supply ramp rate.

It uses a push-pull output stage capable of sourcing ≥500µA at 0.8·VCC and sinking ≥1.6mA at ≤0.3V, eliminating external pull-up resistors. The device remains fully functional down to VCC = 1.2V and rejects fast transients via internal filtering calibrated to ignore negative-going glitches under 100µs at typical overdrive conditions.

Key Specifications

Pinout & Package

MAX6346XR34-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 "FZAW").

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR34-T, MAX6346XR34-T provides enhanced production screening for industrial temperature stability and slightly higher minimum VCC (1.2V), while TPS3124E18DBVR lacks threshold match and requires external biasing - making MAX6346XR34-T the optimal drop-in solution for 3.4V 3.3V-rail supervision in SC70-3 layout.

Availability

MAX6346XR34-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and battery management units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6346XR34-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 power-supply monitoring in space-constrained embedded systems - delivering factory-trimmed thresholds, minimal external components, and guaranteed reset timing without µC intervention.

FAQ

What is the exact reset threshold voltage of MAX6346XR34-T and how tightly is it specified?

The MAX6346XR34-T has a nominal reset threshold of 3.400V, factory-trimmed with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This specification is guaranteed per datasheet Electrical Characteristics table and verified across production lots - not derived from typical curves or estimates. The "R34" suffix explicitly denotes the 3.400V variant within the MAX6346 family.

Does MAX6346XR34-T require any external components to function as a reset supervisor?

No, MAX6346XR34-T operates as a complete reset solution with no external components required. Its push-pull active-low RESET output drives directly into a microprocessor's reset pin without needing a pull-up resistor. The internal voltage reference, comparator, timer, and output stage are fully integrated - confirmed by the "No External Components" feature in the official datasheet and validated in all application schematics.

What package type and dimensions does MAX6346XR34-T use, and is it RoHS-compliant?

MAX6346XR34-T is supplied in a 3-pin SC70-3 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm. It uses lead-free terminations and is RoHS-compliant, indicated by the "-T" suffix per Maxim's ordering nomenclature. The top-side marking "FZAW" corresponds exclusively to the MAX6346XR34-T in SC70 packaging, as documented in Table 2 of the datasheet.

How does MAX6346XR34-T handle short-duration power supply transients?

MAX6346XR34-T is designed to ignore fast negative-going VCC transients: at 100mV overdrive (i.e., VCC = 3.300V when threshold is 3.400V), it tolerates glitches up to ~100µs without asserting reset. This immunity is characterized in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph (Figure 4) and results from internal comparator filtering - a key differentiator versus basic RC-based supervisors.

Can MAX6346XR34-T be used with microcontrollers that have bidirectional reset pins?

MAX6346XR34-T is not suitable for direct interfacing with bidirectional reset pins because it features a push-pull (not open-drain) output. For such µPs (e.g., Motorola 68HC11), the MAX6348XR34-T - which has an open-drain RESET output - is the correct variant. Using MAX6346XR34-T in that configuration risks bus contention and violates the electrical specifications for RESET pin drive capability.