Analog Devices Inc./Maxim Integrated MAX6306UK47D2

Overview

The MAX6306UK47D2 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC supply voltage and provides a push/pull active-low reset output. It features a factory-trimmed 4.7V reset threshold (±2.5% over temperature), 20ms minimum reset timeout, manual reset input (MR), and guaranteed RESET validity down to VCC = 1V. Designed for multivoltage systems, it ensures reliable microprocessor reset during power-up, brownout, or transient events in portable computing and embedded control.

For engineers reviewing the MAX6306UK47D2 datasheet, MAX6306UK47D2 pinout, MAX6306UK47D2 application, or MAX6306UK47D2 equivalent, this page delivers verified electrical parameters, thermal stability data, MR timing behavior, reset assertion logic under VCC droop, and real-world noise immunity characteristics - all critical for robust power-monitoring design in battery-powered and industrial equipment.

Technical Context

The MAX6306UK47D2 uses an internal factory-trimmed resistor divider to monitor VCC against a precision 4.7V threshold, with ±2.5% tolerance across –40°C to +85°C. Its reset generator incorporates a temperature-stable timeout circuit delivering ≥20ms (D2 variant) after all monitored supplies return to regulation.

This device integrates a manual-reset input with 63.5kΩ internal pull-up, TTL/CMOS-compatible logic thresholds, and glitch rejection of <0.1µs transients. Unlike open-drain variants, its push/pull RESET output actively drives low and high, eliminating external pull-up components while maintaining valid logic levels down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6306UK47D2 is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK47D3 and TPS3808G33DBVR, the MAX6306UK47D2 uniquely combines 4.7V precision threshold, manual reset capability, and auxiliary RST IN monitoring in a 5-pin SOT23 - enabling compact, feature-rich supervision where 5V rail integrity and operator control are essential.

Availability

MAX6306UK47D2 is available at Aetrix Electronics and suitable for portable computers, industrial controllers, and battery-powered instruments requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX6306UK47D2 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 high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications applications.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, low-power systems - emphasizing precision threshold accuracy, transient immunity, and minimal external component count.

FAQ

What is the exact factory-programmed reset threshold voltage for MAX6306UK47D2?

The MAX6306UK47D2 has a nominal reset threshold of 4.7V, with a tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). This value is factory-trimmed using an internal resistor divider and corresponds to entry "47" in Table 1 of the datasheet. At +25°C, the typical threshold is 4.700V, with min/max limits of 4.583V and 4.818V respectively.

Does MAX6306UK47D2 support manual reset functionality, and how is it implemented?

Yes, MAX6306UK47D2 includes a dedicated MR (manual reset) input on pin 4. Pulling MR low forces an immediate reset assertion, which remains active for the full 20ms timeout period after MR returns high. The pin features an internal 63.5kΩ pull-up resistor, allowing it to be left unconnected or tied directly to a momentary switch to ground - no external components or debounce circuitry are required.

What is the minimum VCC voltage at which MAX6306UK47D2 guarantees valid RESET output behavior?

MAX6306UK47D2 guarantees valid RESET output down to VCC = 1V. Below this voltage, the push/pull driver's sourcing/sinking capability degrades, but the device continues to assert RESET correctly as long as VCC remains ≥1V. This ensures fail-safe reset behavior during deep brownout conditions common in battery-powered systems approaching end-of-life.

Can MAX6306UK47D2 monitor additional voltage rails beyond VCC?

Yes, MAX6306UK47D2 includes pin 3 (RST IN) - an adjustable undervoltage reset input referenced to an internal 1.23V comparator threshold. By connecting an external resistor divider from the target rail to GND, designers can program custom reset points for secondary supplies such as 3.3V or 2.5V, enabling coordinated reset across multiple rails without adding extra ICs.

How does MAX6306UK47D2 handle short-duration voltage transients on the VCC line?

MAX6306UK47D2 is specifically designed to ignore fast VCC transients, rejecting glitches as short as 0.1µs. Its internal architecture filters out noise that would otherwise cause false resets - a key requirement in electrically noisy environments like motor drives or switching power supplies. Data sheet Figure TOC7 quantifies maximum allowable transient duration versus overdrive magnitude for reliable operation.