Analog Devices Inc./Maxim Integrated MAX6315US28D1

Overview

MAX6315US28D1 from Maxim Integrated is a low-power, open-drain microprocessor supervisory circuit in SOT143 package that monitors VCC supply voltage and asserts an active-low reset signal when voltage falls below 2.80V or upon manual reset assertion. It provides a factory-trimmed 1ms minimum reset timeout period, 5µA supply current at +25°C, operates across -40°C to +125°C, and supports level-shifting via its open-drain RESET output pulled up to voltages up to +6V - used in battery-powered controllers and critical µP power monitoring.

For engineers reviewing the MAX6315US28D1 datasheet, MAX6315US28D1 pinout, MAX6315US28D1 application, or MAX6315US28D1 equivalent, this page delivers verified electrical parameters, thermal performance data, SOT143 pin mapping, reset threshold accuracy (±1.8% over temperature), MR input behavior, and design guidance for transient immunity and pullup selection.

Technical Context

The MAX6315US28D1 implements a precision voltage-monitoring comparator with laser-trimmed internal resistors to set a nominal 2.80V reset threshold, with ±1.8% tolerance over -40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 1ms reset timeout after VCC rises above threshold or MR deasserts.

It features an open-drain n-channel MOSFET RESET output capable of sinking 0.5mA at VCC > 2.5V, with VOL ≤ 0.4V, and accepts external pullup voltages up to +6V - enabling level-shifted reset signaling between disparate supply domains. The MR input includes a 63kΩ internal pullup and rejects glitches <100ns.

Key Specifications

Pinout & Package

SOT143 (4-pin, surface-mount) package with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. 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 MAX6315US28D1, the MAX811TEUS29D3-T offers higher reset threshold and longer timeout at higher current, while the TPS3808G125DBVR reduces supply current by 78% but sacrifices open-drain flexibility and adds two pins - trade-offs directly impact PCB layout, power budget, and voltage-domain isolation requirements.

Availability

MAX6315US28D1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC controllers, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6315US28D1 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 semiconductor company specializing in analog, mixed-signal, and high-reliability ICs for industrial, automotive, communications, and computing markets.

The MAX6315US28D1 belongs to Maxim's µP supervisory product line, designed specifically for cost-sensitive, space-constrained applications demanding precise voltage monitoring, minimal external components, and guaranteed operation across harsh thermal environments.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6315US28D1?

The MAX6315US28D1 has a nominal reset threshold of 2.80V, with a guaranteed tolerance of ±1.8% over the full operating temperature range (-40°C to +125°C). This specification is factory-laser-trimmed and documented in the Electrical Characteristics table of the official datasheet. The MAX6315US28D1 maintains this accuracy without external calibration components.

Does MAX6315US28D1 support operation with VCC below 2.8V?

Yes, the MAX6315US28D1 remains functional down to VCC = 1.0V, and its RESET output is guaranteed to be logic-low for VCC > 1V. However, reset assertion occurs only when VCC falls below the 2.80V threshold. Below 1.0V, the device ceases to actively monitor or assert reset, but the MAX6315US28D1 does not latch or fail catastrophically - it resumes normal supervision once VCC recovers above 1.0V.

Can the RESET output of MAX6315US28D1 be pulled up to 5V while VCC is 3.3V?

Yes, the MAX6315US28D1's open-drain RESET output is explicitly rated to be pulled up to voltages up to +6.0V, independent of VCC. When VCC = 3.3V, a 5V pullup is fully supported and commonly used to interface with 5V-tolerant microcontroller reset inputs. The MAX6315US28D1 sinks current reliably under this condition, with VOL ≤ 0.4V at ISINK = 0.5mA.

What is the minimum pulse width required on the MR pin to trigger reset in MAX6315US28D1?

The MAX6315US28D1 requires a minimum MR low pulse width of 1µs to reliably assert reset. This value is specified in the Electrical Characteristics table under "MR Minimum Input Pulse". The device also rejects shorter noise spikes, with MR glitch rejection rated at 100ns - meaning transients ≤100ns will not cause unintended reset assertion. This behavior is inherent to the MAX6315US28D1's internal input filtering.

Is MAX6315US28D1 pin-compatible with other devices in the MAX6315 family?

Yes, all MAX6315 variants - including MAX6315US28D1 - share identical SOT143 pinout (VCC, MR, RESET, GND) and mechanical footprint. Differences are limited to reset threshold voltage, timeout period, and temperature grade encoded in the suffix (e.g., D1 = -40°C to +125°C). No PCB redesign is needed when substituting within the MAX6315 family, provided timing and threshold requirements are met. The MAX6315US28D1 maintains full pin compatibility across all variants.