Analog Devices Inc./Maxim Integrated MAX6347XR45-T

Overview

MAX6347XR45-T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage falls below 4.500V (±2.5% over temperature), maintaining reset for ≥100ms after recovery; it operates from 1.2V to 5.5V, draws ≤1.0µA at 3V, and is housed in a 3-pin SC70 package for space-constrained embedded power monitoring.

For engineers reviewing the MAX6347XR45-T datasheet, MAX6347XR45-T pinout, MAX6347XR45-T application, or MAX6347XR45-T equivalent, this device serves as a precision, ultra-low-power reset supervisor for battery-powered µP systems requiring stable 4.5V threshold detection with guaranteed state down to 1V and immunity to fast VCC transients.

Technical Context

The MAX6347XR45-T implements a factory-trimmed bandgap-based reset comparator with 4.500V nominal threshold (±1.5% at +25°C, ±2.5% over −40°C to +85°C) and 40ppm/°C tempco. Its push-pull output drives high during reset assertion and low otherwise, eliminating external pull-up components.

It features 100ms minimum reset timeout after power-up, 20µs VCC-to-reset delay, and transient immunity validated up to 200mV overdrive - rejecting glitches shorter than ~100µs at 100mV under VTH. Supply current remains ≤1.0µA across full temperature range at 3V.

Key Specifications

Pinout & Package

MAX6347XR45-T is packaged in a 3-pin SC70-3 (X3-2 outline), footprint-compatible with SOT23-3 but with smaller 1.25mm × 0.85mm body and 0.65mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6327XR45-T, MAX6347XR45-T provides identical electrical performance with updated manufacturing controls, while TLV803EC45DBVR requires redesign for pull-up integration and increases standby current - making MAX6347XR45-T optimal for new ultra-low-power designs demanding drop-in reliability and minimal BOM.

Availability

MAX6347XR45-T 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 with guaranteed long-term availability.

Supply support for MAX6347XR45-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, designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications, with emphasis on power efficiency and integration.

The MAX63xx family delivers ultra-low-power, factory-trimmed reset supervision for microprocessor systems - engineered specifically for battery-operated and thermally demanding embedded applications where reliability and minimal footprint are critical.

FAQ

What is the exact reset threshold voltage of MAX6347XR45-T and how does it vary with temperature?

The MAX6347XR45-T has a nominal reset threshold of 4.500V at +25°C, with tolerance of ±1.5%. Over the full operating temperature range of −40°C to +85°C, the threshold varies by ±2.5%, resulting in a guaranteed range of 4.387V to 4.612V. Its 40ppm/°C tempco ensures predictable, linear drift - adding less than ±15mV deviation across the entire range - critical for stable operation in automotive or industrial environments.

Does MAX6347XR45-T require any external components to function as a reset supervisor?

No, MAX6347XR45-T requires zero external components. It integrates a precision voltage reference, comparator, timing circuit, and active-high push-pull output driver. Unlike open-drain alternatives, its push-pull output eliminates the need for an external pull-up resistor. The only required connections are VCC, GND, and the RESET output tied directly to the microprocessor's reset pin - simplifying layout and reducing BOM cost.

How does the 100ms minimum reset timeout of MAX6347XR45-T benefit microprocessor startup sequences?

The 100ms minimum reset timeout ensures the MAX6347XR45-T holds the microprocessor in reset long enough for all internal clocks, PLLs, and memory controllers to stabilize after power-on or brownout recovery. This prevents race conditions and undefined states during boot - especially critical for ARM Cortex-M or RISC-V SoCs with complex clock trees. The actual timeout ranges from 100ms to 280ms depending on temperature and process variation, guaranteeing robustness across manufacturing lots and environmental conditions.

Can MAX6347XR45-T operate reliably when the VCC supply drops below 2.0V?

Yes, MAX6347XR45-T is fully specified to maintain correct reset assertion and deassertion behavior down to VCC = 1.2V over temperature, and guaranteed functional down to 1.0V. Its internal bandgap reference and comparator remain stable well below typical µP operating voltages, ensuring deterministic reset signaling even during deep brownout events - a key advantage over many competing supervisors that fail or behave unpredictably below 1.8V.

What package type and footprint does MAX6347XR45-T use, and is it compatible with automated assembly?

MAX6347XR45-T uses the 3-pin SC70-3 package (outline X3-2), measuring 1.25mm × 0.85mm with 0.65mm lead pitch. It is fully compatible with standard SMT reflow processes and vision-guided pick-and-place equipment. The package is RoHS-compliant and available in tape-and-reel format (10,000 pieces per reel), supporting high-volume automated assembly without modification to existing production lines.