Analog Devices Inc./Maxim Integrated MAX6310UK29D4-T

Overview

MAX6310UK29D4-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory circuit that monitors VCC (factory-set 2.9V reset 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 1120ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring robust brownout and transient immunity.

For engineers reviewing the MAX6310UK29D4-T datasheet, MAX6310UK29D4-T pinout, MAX6310UK29D4-T application, or MAX6310UK29D4-T equivalent, key selection considerations include its dual-input monitoring capability (VCC + RST IN + OVRST IN), factory-programmed 2.9V VCC threshold with ±2.5% tolerance over temperature, 1120ms reset timeout, push/pull RESET output drive strength, and SOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6310UK29D4-T implements a triple-monitor architecture: internal factory-trimmed resistor divider for VCC supervision at 2.9V nominal, external resistor-divider–based comparator for RST IN (undervoltage), and another for OVRST IN (overvoltage), all referenced to a stable 1.23V internal bandgap. Its reset generator includes a precision timeout timer with four factory-selectable delays - D4 corresponds to 1120ms minimum - and guarantees valid RESET assertion even as VCC drops to 1V.

It uses a push/pull (complementary) RESET output stage capable of sourcing 800µA at VCC > 4.25V and sinking 3.2mA under same conditions, eliminating need for external pull-up resistors. Immunity to fast transients is achieved via internal filtering and design tolerance to negative-going VCC glitches up to ~100µs at 100mV overdrive, per typical operating characteristics.

Key Specifications

Pinout & Package

MAX6310UK29D4-T is housed in a 5-pin SOT23-5 surface-mount package (outline no. 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6310UK29D4-T, the D3 variant offers faster reset release but less margin for slow-rising supplies, while TLV809K33DBZR trades monitoring flexibility and drive strength for extreme low power and lower pin count - neither is pin-compatible, and both require redesign if replacing MAX6310UK29D4-T in triple-monitor applications.

Availability

MAX6310UK29D4-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6310UK29D4-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 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 embedded systems needing simultaneous monitoring of primary and auxiliary rails with configurable thresholds and robust noise immunity - targeting applications where reliability under electrical stress is non-negotiable.

FAQ

What is the factory-programmed reset threshold voltage for MAX6310UK29D4-T?

The MAX6310UK29D4-T has a factory-programmed VCC reset threshold of 2.9V nominal, with ±2.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is set by an internal trimmed resistor divider and is confirmed in the Ordering Information section and Table 1 of the datasheet, where "29" in the part number maps to 2.9V.

Does MAX6310UK29D4-T support monitoring of external voltage rails beyond VCC?

Yes, MAX6310UK29D4-T supports two additional monitoring inputs: RST IN (pin 4) for undervoltage detection and OVRST IN (pin 3) for overvoltage detection. Both compare external voltages against a precise 1.23V internal reference using external resistor dividers, enabling flexible supervision of auxiliary rails like 5V, 12V, or battery voltages independent of the 2.9V VCC threshold.

What is the reset timeout period for MAX6310UK29D4-T, and how is it configured?

The MAX6310UK29D4-T features a factory-programmed reset timeout period of 1120ms minimum (D4 index), as indicated by the "D4" in its part number. This fixed delay is implemented on-die and requires no external components. The timeout begins after all monitored supplies exceed their thresholds and ensures the microprocessor remains held in reset long enough for stable power-up sequencing.

What type of RESET output does MAX6310UK29D4-T provide, and what are its drive capabilities?

MAX6310UK29D4-T provides an active-low push/pull RESET output (pin 1) capable of both sourcing and sinking current. At VCC > 4.25V, it can sink up to 3.2mA or source up to 800µA - eliminating the need for an external pull-up resistor and enabling direct interfacing with standard CMOS/TTL reset inputs across diverse microcontrollers and FPGAs.

Is MAX6310UK29D4-T compatible with lead-free PCB assembly processes?

Yes, MAX6310UK29D4-T is offered in lead-free packaging. The "-T" suffix denotes tape-and-reel packaging with RoHS-compliant, lead-free terminations. Per the Ordering Information, lead-free versions are specified by replacing "-T" with "+T", but the standard -T variant already meets JEDEC J-STD-020 reflow profile requirements with a peak soldering temperature of +260°C for Pb-free packages.