Analog Devices Inc./Maxim Integrated MAX6306UK30D3-T

Overview

The MAX6306UK30D3-T from Maxim Integrated is a 5-pin SOT23 programmable reset IC designed to monitor VCC supply voltage and assert an active-low push/pull RESET signal when VCC falls below a factory-set 3.0V threshold (±2.5% over 0°C to +70°C). It features a 140ms minimum reset timeout, manual reset input (MR), and guaranteed RESET validity down to VCC = 1V. Used in multivoltage embedded systems for reliable power-on and brownout reset generation.

For engineers reviewing the MAX6306UK30D3-T datasheet, MAX6306UK30D3-T pinout, MAX6306UK30D3-T application, or MAX6306UK30D3-T equivalent, key selection criteria include its 3.0V VCC reset threshold tolerance, 140ms timeout period, MR input compatibility with TTL/CMOS logic, immunity to fast VCC transients, and guaranteed operation across 0°C to +70°C industrial temperature range.

Technical Context

This device implements a factory-trimmed internal voltage divider to monitor VCC against a precision reference, eliminating external components. Its reset generator includes a temperature-stable timeout circuit and hysteresis (2.5mV on adjustable inputs) to prevent chatter during threshold crossings.

The MR input integrates a 63.5kΩ internal pull-up resistor and supports noise-immune manual reset initiation with <1.5µs minimum pulse width. RESET output is push/pull (active-low), sourcing up to 800µA at VCC > 4.25V and sinking 3.2mA - enabling direct interface with µP reset pins without external pull-ups.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (U5+1), RoHS-compliant lead-free, tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK30D2-T and TPS3808G30DBVR, the MAX6306UK30D3-T uniquely balances 140ms timeout duration, integrated manual reset, and 3.0V threshold stability across 0°C to +70°C - making it optimal for industrial controllers requiring robust field-serviceability and deterministic brownout response.

Availability

MAX6306UK30D3-T is available at Aetrix Electronics and suitable for PC power sequencing, industrial PLC controllers, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6306UK30D3-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6305–MAX6313 family was engineered to deliver precise, multi-rail reset supervision in space-constrained embedded systems - emphasizing low quiescent current, factory-programmed thresholds, and transient immunity for mission-critical power monitoring.

FAQ

What is the exact factory-set reset threshold voltage for MAX6306UK30D3-T?

The MAX6306UK30D3-T has a nominal factory-set VCC reset threshold of 3.0V, with a tolerance of ±2.5% over the 0°C to +70°C operating temperature range. This value is trimmed using an internal voltage divider and does not require external resistors. The actual threshold remains stable across temperature with a drift of only 40ppm/°C, as specified in the Electrical Characteristics table.

Does MAX6306UK30D3-T support manual reset functionality, and how is it implemented?

Yes, the MAX6306UK30D3-T includes a dedicated MR (manual reset) input on pin 4. A logic-low signal (≤0.8V) on MR forces an immediate RESET assertion, which remains active for the full 140ms timeout period after MR returns high. The pin features an internal 63.5kΩ pull-up resistor, allowing direct connection to a normally-open momentary switch tied to GND - no external components or debounce circuitry are needed.

What is the guaranteed operating VCC range for MAX6306UK30D3-T?

The MAX6306UK30D3-T operates over a VCC range of (VTH + 2.5%) to +5.5V, which translates to 2.75V to 5.5V for its 3.0V threshold variant. Below 2.75V, the device enters undervoltage lockout and asserts RESET; above 5.5V risks permanent damage per Absolute Maximum Ratings. Operation is fully specified from 0°C to +70°C within this supply window.

How does MAX6306UK30D3-T handle fast voltage transients on the VCC line?

The MAX6306UK30D3-T is specifically designed to ignore fast VCC transients - it rejects negative-going glitches as short as 100ns when the overdrive (VTH – VCC) is ≤10mV, per Typical Operating Characteristics graphs. This immunity stems from internal filtering and comparator hysteresis, preventing spurious resets during switching noise or load-step events common in DC-DC converter outputs.

Is the RESET output of MAX6306UK30D3-T open-drain or push/pull, and what are its drive capabilities?

The MAX6306UK30D3-T features an active-low push/pull RESET output (pin 1), not open-drain. It can both sink and source current: sinking up to 3.2mA at VCC > 4.25V (VOL ≤ 0.4V), and sourcing up to 800µA at VCC > 4.25V (VOH ≥ VCC – 1.5V). This eliminates the need for an external pull-up resistor and enables direct interfacing with µP reset pins requiring active-drive capability.