Analog Devices Inc./Maxim Integrated MAX6306UK47D2+

Overview

MAX6306UK47D2+ from Maxim Integrated is a 5-pin SOT23 programmable microprocessor supervisory circuit that monitors VCC supply voltage and provides a push/pull active-low reset output. It features a factory-programmed 4.7V ±2.5% reset threshold, 20ms 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 MAX6306UK47D2+ datasheet, MAX6306UK47D2+ pinout, MAX6306UK47D2+ application, or MAX6306UK47D2+ equivalent, key selection considerations include its 4.7V VCC reset threshold tolerance, 20ms timeout period, MR input compatibility with TTL/CMOS logic, immunity to fast VCC transients, and operation across 0°C to +70°C industrial temperature range.

Technical Context

The MAX6306UK47D2+ uses an internal factory-trimmed resistor divider to monitor VCC against a precision 4.7V threshold, with ±2.5% accuracy over temperature. Its reset generator includes a programmable timeout timer and a manual-reset input with internal 63.5kΩ pull-up resistor.

This device asserts an active-low push/pull RESET signal when VCC drops below 4.7V (±2.5%), and holds it asserted for ≥20ms after VCC recovers. It also supports external undervoltage monitoring via RST IN and manual reset assertion via MR - both validated for noise immunity and transient rejection.

Key Specifications

Pinout & Package

MAX6306UK47D2+ is housed in a lead-free 5-pin SOT23 package (package code U5+1), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height - optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK47D3+, the MAX6306UK47D2+ enables faster system startup; compared with TPS3808G33DBVR, it supports 5V rail supervision, manual reset, and external voltage monitoring - making it uniquely suited for multivoltage industrial designs.

Availability

MAX6306UK47D2+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, PC power sequencing, and multivoltage sensor nodes requiring stable component supply and long-term production continuity.

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 robust, low-power microprocessor supervision in multivoltage systems - delivering precision reset thresholds, manual reset capability, and transient immunity in miniature SOT23 packages.

FAQ

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

The MAX6306UK47D2+ has a factory-programmed VCC reset threshold of 4.7V with ±2.5% tolerance over the full operating temperature range (0°C to +70°C). This value is trimmed using an internal resistor divider and verified per Maxim's production test flow - no external calibration is needed. The "47" in the part number explicitly denotes the 4.7V nominal threshold.

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 active-low RESET assertion, which remains active for the full 20ms timeout period after MR returns high. An internal 63.5kΩ pull-up resistor allows direct connection to a normally open momentary switch to GND - no external components are required for basic manual reset implementation.

Can MAX6306UK47D2+ monitor voltages other than VCC, and if so, how?

Yes, MAX6306UK47D2+ includes an RST IN input (pin 3) for monitoring a second voltage rail. By connecting an external resistor divider between the target rail and GND, the voltage at RST IN is scaled to match the internal 1.23V reference. When the scaled voltage falls below 1.23V, the device asserts RESET - enabling supervision of 3.3V, 2.5V, or other auxiliary supplies alongside the primary 4.7V VCC rail.

What is the minimum VCC supply voltage required for MAX6306UK47D2+ to operate correctly?

MAX6306UK47D2+ requires VCC ≥ 4.818V to operate within specification. This is derived from the datasheet condition: VCC must be ≥ VTH × 1.025 = 4.7V × 1.025 ≈ 4.818V. Below this, the internal VCC monitor may not function reliably. The device guarantees valid RESET output down to VCC = 1V, but proper supervision only occurs above the 4.818V minimum operating voltage.

Is MAX6306UK47D2+ compatible with both 3.3V and 5V logic systems for the MR input?

Yes, the MR input of MAX6306UK47D2+ is compatible with both 3.3V and 5V logic families. For VTH < 4.0V (as in this 4.7V part), the MR high-level threshold is 0.7 × VCC, and the low-level threshold is 0.3 × VCC. With VCC = 5V, VIH = 3.5V and VIL = 1.5V - meeting TTL and CMOS logic levels. This allows direct interfacing with microcontrollers, FPGAs, or switches across common logic families without level-shifting.