Analog Devices Inc./Maxim Integrated MAX6315US44D3

Overview

MAX6315US44D3 from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit in SOT143 package that monitors VCC supply voltage and asserts an open-drain active-low RESET signal when voltage falls below 4.39V or when manual reset (MR) is asserted. It provides a factory-programmed 140ms minimum reset timeout period, 5µA supply current at +25°C, and operates across -40°C to +125°C. It is used in portable equipment and critical µP power monitoring where precise brownout detection and noise-immune reset timing are required.

For engineers reviewing the MAX6315US44D3 datasheet, MAX6315US44D3 pinout, MAX6315US44D3 application, or MAX6315US44D3 equivalent, key selection considerations include its 4.39V reset threshold, 140ms timeout, SOT143 footprint, open-drain output capable of level-shifting above VCC, and guaranteed operation over extended temperature range.

Technical Context

The MAX6315US44D3 implements a precision voltage-monitoring comparator with laser-trimmed internal resistors to set a nominal 4.39V reset threshold (±3.5% over -40°C to +125°C), and integrates a monostable timer that holds RESET low for ≥140ms after VCC rises above threshold or MR deasserts. Its open-drain RESET output uses an n-channel MOSFET switch rated for 0V to +6V pull-up, enabling level-shifted reset signaling across supply domains.

It features an internally pulled-up MR input (63kΩ) immune to transients <1µs at 100mV overdrive, and draws only 5µA typical ICC while supporting VCC from 2.5V to 5.5V. The device is specified for full functionality across -40°C to +125°C without external components.

Key Specifications

Pinout & Package

SOT143 (4-pin, surface-mount) package with 1.3mm × 2.1mm footprint and 0.95mm height; lead-free and RoHS-compliant; tape-and-reel packaging only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US44D2-T and MAX6315US44D4-T, the MAX6315US44D3 offers the mid-range 140ms timeout - balancing robust power-rail recovery margin against boot latency, making it optimal for general-purpose 32-bit microcontrollers with moderate clock startup requirements.

Availability

MAX6315US44D3 is available at Aetrix Electronics and suitable for battery-powered portable instruments, critical microcontroller power monitoring, and automotive body control modules requiring stable component supply, extended temperature operation, and consistent reset timing behavior.

Supply support for MAX6315US44D3 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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.

The MAX6315 family delivers highly accurate, low-power supervisory circuits with factory-trimmed thresholds and fixed timeout periods - engineered specifically for reliable µP reset generation in space- and power-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX6315US44D3?

The MAX6315US44D3 has a factory-laser-trimmed nominal reset threshold of 4.39V, with a tolerance of ±3.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet, and applies exclusively to the MAX6315US44D3 variant - not to other members of the MAX6315 family with different suffixes.

Does the MAX6315US44D3 require external components to operate?

No, the MAX6315US44D3 requires no external components for basic operation. Its MR input includes an internal 63kΩ pull-up resistor, and the open-drain RESET output only needs an external pull-up resistor (typically 10kΩ) to the target logic supply. No capacitors, trim pots, or additional ICs are needed - enabling minimal footprint and high reliability in production designs using the MAX6315US44D3.

What is the guaranteed minimum reset timeout period for the MAX6315US44D3?

The MAX6315US44D3 guarantees a minimum reset timeout period of 140ms after VCC rises above the 4.39V threshold or after the MR input is deasserted. This value is explicitly listed in the Ordering Information table and verified across -40°C to +125°C in the Electrical Characteristics section - ensuring sufficient hold time for even slow-starting microprocessors when using the MAX6315US44D3.

Can the RESET output of the MAX6315US44D3 be pulled up to a voltage higher than its VCC supply?

Yes, the RESET output of the MAX6315US44D3 is an open-drain n-channel MOSFET rated for up to +6.0V, allowing it to be pulled up to any voltage between 0V and +6V - including voltages higher than the device's own VCC. This capability enables level-shifted reset signaling, such as using the MAX6315US44D3 to monitor a 3.3V rail while driving a 5V µP reset input - a key design advantage confirmed in the Pin Description and Typical Operating Circuit sections.

Is the MAX6315US44D3 qualified for automotive under-hood applications?

Yes, the MAX6315US44D3 is fully specified for operation from -40°C to +125°C and is packaged in a qualified SOT143 outline. While not AEC-Q200 certified out-of-box, its extended temperature rating, guaranteed performance across that range, and immunity to short VCC transients make it suitable for non-safety-critical automotive under-hood functions like body control modules - provided system-level validation is performed per OEM requirements for the MAX6315US44D3.