Analog Devices Inc./Maxim Integrated MAX6316LUK45CX+T

Overview

The MAX6316LUK45CX+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 4.5V factory-trimmed reset threshold (±1.5% at +25°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply voltage, provides manual reset input (MR), and asserts reset during power-up, brownout, or software hang conditions - used in embedded controllers and portable instrumentation.

For engineers reviewing the MAX6316LUK45CX+T datasheet, MAX6316LUK45CX+T pinout, MAX6316LUK45CX+T application, or MAX6316LUK45CX+T equivalent, this page delivers verified electrical parameters, SOT23-5 terminal mapping, AEC-Q100-qualified operation from –40°C to +125°C, and real-world substitution guidance for μP reset supervision in battery-powered and industrial control systems.

Technical Context

The MAX6316LUK45CX+T implements a precision bandgap-based reset threshold detector with 40ppm/°C temperature coefficient and guaranteed reset validity down to VCC = 1V. Its internal watchdog timer clears on any WDI edge (rising or falling) and times out after 1.6s if unserviced, triggering a full system reset.

It features integrated MR input with 52kΩ internal pullup, glitch rejection of 100ns, and push/pull RESET output capable of sourcing ≥500µA and sinking ≥1.2mA at VCC ≥ 2.7V. The device requires no external components and operates across 1.0V–5.5V supply range.

Key Specifications

Pinout & Package

MAX6316LUK45CX+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated assembly and thermal performance (θJA = 255.9°C/W on multilayer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUR45CT, the MAX6316LUK45CX+T provides identical supervision functionality with RoHS compliance and automotive qualification; versus TPS3808G33DBVR, it adds integrated watchdog, manual reset, and higher-voltage 4.5V threshold - enabling direct replacement in 5V industrial and automotive designs without layout changes.

Availability

MAX6316LUK45CX+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX6316LUK45CX+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 high-performance analog and mixed-signal ICs for power, sensing, and timing applications, with emphasis on reliability and integration for demanding environments.

The MAX6316–MAX6322 family was developed specifically for microprocessor reset supervision in space-constrained, high-reliability systems - delivering factory-trimmed thresholds, integrated watchdog, and AEC-Q100 qualification in miniature SOT23 packages.

FAQ

What is the exact reset threshold voltage of the MAX6316LUK45CX+T?

The MAX6316LUK45CX+T has a factory-trimmed nominal reset threshold of 4.5V, specified as ±1.5% at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 of the Maxim datasheet and corresponds to the "45" in the part number. The MAX6316LUK45CX+T uses laser-trimmed resistors to achieve this precision without external components.

Does the MAX6316LUK45CX+T include a watchdog timer, and what is its timeout period?

Yes, the MAX6316LUK45CX+T includes an integrated watchdog timer with a typical timeout period of 1.6 seconds. This is indicated by the "Y" in the ordering code (MAX6316LUK45CY+T), corresponding to the Y-T variant in Table 3. The timer resets on any rising or falling edge at the WDI pin and asserts RESET if unserviced for 1.6s - a key safety feature for embedded firmware supervision.

What is the function of Pin 3 (MR) on the MAX6316LUK45CX+T, and how should it be used?

Pin 3 is the active-low Manual Reset (MR) input. Pulling MR low forces an immediate reset that remains asserted for the full 140ms timeout period after MR returns high. The MAX6316LUK45CX+T includes a 52kΩ internal pullup resistor, so MR may be left unconnected when unused. It rejects 100ns glitches and supports TTL/CMOS logic levels - enabling direct connection to pushbutton switches or GPIO pins without external circuitry.

Is the MAX6316LUK45CX+T compatible with 3.3V microcontrollers?

The MAX6316LUK45CX+T operates from 1.0V to 5.5V and its RESET output is fully compatible with 3.3V logic systems: VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.7V), and VOH ≥ 0.8 × VCC at ISOURCE = 500µA. However, its 4.5V reset threshold is intended for 5V supply monitoring - for 3.3V rail supervision, consider MAX6316LUK33CX+T instead.

What package type and RoHS status does the MAX6316LUK45CX+T use?

The MAX6316LUK45CX+T uses a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) with gull-wing leads and RoHS-compliant lead-free finish. The "+T" suffix explicitly denotes lead-free, tape-and-reel packaging per JEDEC J-STD-020 moisture sensitivity level 1. Thermal resistance is θJA = 255.9°C/W on multilayer PCBs, supporting reliable operation in compact, thermally constrained layouts.