Analog Devices Inc./Maxim Integrated MAX6307UK45D2+

Overview

The MAX6307UK45D2+ from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.5V threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN), asserting an active-low push/pull RESET output when any monitored supply violates its threshold. It features 20ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring robust power-up/brownout protection.

For engineers reviewing the MAX6307UK45D2+ datasheet, MAX6307UK45D2+ pinout, MAX6307UK45D2+ application, or MAX6307UK45D2+ equivalent, key selection considerations include its dual adjustable reset inputs (RST IN/OVRST IN), factory-trimmed 4.5V VCC threshold with ±2.5% tolerance over temperature, 20ms reset timeout, SOT23-5 package compatibility, and immunity to fast VCC transients.

Technical Context

The MAX6307UK45D2+ implements a triple-monitor architecture: internal factory-trimmed resistor divider for VCC supervision at 4.5V nominal, external resistor-divider–based comparator for RST IN (undervoltage), and another for OVRST IN (overvoltage), all referenced to a 1.23V internal bandgap. Its push/pull RESET output drives high/low without external pull-up.

It uses a precision internal timer to enforce a guaranteed minimum 20ms reset assertion after all monitored supplies stabilize above their thresholds, and it guarantees functional reset assertion even as VCC drops to 1V - critical for fail-safe sequencing in battery-backed or low-voltage systems.

Key Specifications

Pinout & Package

Package: SOT23-5, surface-mount, lead-free (RoHS-compliant), 5-terminal plastic package with standard footprint (land pattern 90-0174).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6307UK45D3+, the MAX6307UK45D2+ delivers tighter timing control for fast-boot µPs; compared with TPS3808G33DBVR, it provides essential flexibility for systems with mixed 4.5V/3.3V/12V rails and overvoltage safety checks - making it irreplaceable in complex multivoltage designs.

Availability

MAX6307UK45D2+ is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body control modules, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6307UK45D2+ 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, automotive, and communications markets.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, reliability-critical systems - delivering precision reset generation with minimal external components and robust transient immunity.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6307UK45D2+?

The MAX6307UK45D2+ has a factory-programmed VCC reset threshold of 4.5V nominal, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during production and documented in Maxim's Electrical Characteristics table under "Reset Threshold (VTH)" for MAX6307 devices. The "45" in the part number directly encodes this 4.5V specification.

Does MAX6307UK45D2+ include a manual reset (MR) input?

No, the MAX6307UK45D2+ does not include a manual reset (MR) input. Per the Selector Table and Pin Description in the datasheet, MR is present only on MAX6306/MAX6309/MAX6312 variants. The MAX6307UK45D2+ pinout consists solely of RESET, GND, RST IN, OVRST IN, and VCC - omitting MR to reduce complexity where operator-initiated reset is unnecessary.

What are the absolute maximum ratings for VCC and other pins on MAX6307UK45D2+?

The MAX6307UK45D2+ has an absolute maximum VCC rating of -0.3V to +6V. All other pins (RST IN, OVRST IN, RESET) are rated from -0.3V to (VCC + 0.3V). Exceeding these limits may cause permanent damage. Continuous power dissipation in the SOT23-5 package is 571mW at +70°C, derating by 7.1mW/°C above that temperature.

Can MAX6307UK45D2+ monitor both undervoltage and overvoltage on the same external rail?

Yes, MAX6307UK45D2+ can monitor both conditions on a single external rail using separate resistor dividers: one connected to RST IN for undervoltage detection (asserts reset when input <1.23V), and another to OVRST IN for overvoltage detection (asserts reset when input >1.23V). This dual-comparator architecture enables comprehensive fault coverage - for example, detecting both battery depletion and charger overvoltage in portable equipment.

Is the RESET output of MAX6307UK45D2+ compatible with 3.3V logic systems?

Yes, the RESET output of MAX6307UK45D2+ is fully compatible with 3.3V logic systems. As a push/pull driver, it guarantees VOH ≥0.8 × VCC and VOL ≤0.3V when sinking 500µA - meaning at VCC = 4.5V, it drives high to ≥3.6V and low to ≤0.3V, safely interfacing with standard 3.3V CMOS inputs without level-shifting circuitry.