Analog Devices Inc./Maxim Integrated MAX6340UK31/V+T

Overview

MAX6340UK31/V+T from Analog Devices is a low-power, AEC-Q100 qualified microprocessor supervisor IC with open-drain active-low reset output, 3.075V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors system supply voltage in automotive and industrial embedded controllers requiring reliable brownout detection and power-up sequencing.

For engineers reviewing the MAX6340UK31/V+T datasheet, MAX6340UK31/V+T pinout, MAX6340UK31/V+T application, or MAX6340UK31/V+T equivalent, key selection criteria include its SOT23-5 open-drain reset architecture, 1.6µA typical quiescent current, -40°C to +125°C operating range, and AEC-Q100 qualification for automotive use cases.

Technical Context

The MAX6340UK31/V+T implements a precision voltage detector with laser-trimmed internal resistive divider setting a 3.075V reset threshold, coupled with a 240nA current source charging an external capacitor on the SRT pin to generate a programmable timeout delay. Its open-drain RESET output requires an external pullup and supports logic-level interfacing across multiple supply domains.

It operates as a single-function supervisor: asserting RESET low when VCC falls below threshold and holding it low for the capacitor-determined timeout after VCC recovers. Immunity to short VCC transients (<50µs at 100mV overdrive) and validity down to VCC = 1V ensure robust behavior during noisy power conditions.

Key Specifications

Pinout & Package

MAX6340UK31/V+T is housed in a 5-pin SOT23-5 package (package code U5+2), with exposed pad not electrically connected. The compact 2.9mm × 1.6mm footprint supports high-density PCB layouts in space-constrained automotive modules and portable equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP302LSN30T1G and TLV809E30DBZR, the MAX6340UK31/V+T uniquely combines AEC-Q100 Grade 1 qualification, capacitor-programmable reset timeout, and open-drain output in a single SOT23-5 package-making it the only option meeting full automotive functional safety and design flexibility requirements.

Availability

MAX6340UK31/V+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and battery-powered medical monitors requiring stable component supply with long-term lifecycle support.

Supply support for MAX6340UK31/V+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX6340 series belongs to Analog Devices' precision voltage supervisor product line, designed specifically for automotive-grade power monitoring and fail-safe reset generation in harsh-environment embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6340UK31/V+T and how does it vary with temperature?

The MAX6340UK31/V+T has a nominal reset threshold of 3.075V, with tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +125°C operating range. This specification is laser-trimmed at wafer test and verified per AEC-Q100 stress requirements, ensuring consistent brownout detection across automotive thermal profiles without calibration.

Does MAX6340UK31/V+T require an external pullup resistor on the RESET pin, and what value is recommended?

Yes, MAX6340UK31/V+T features an open-drain RESET output and requires an external pullup resistor. A value between 10kΩ and 100kΩ is recommended-10kΩ ensures fast rise time for high-speed µPs, while 100kΩ minimizes current draw in ultra-low-power applications. The pullup may connect to any supply from 0V to 5.5V, enabling flexible logic-level interfacing.

How is the reset timeout period set on MAX6340UK31/V+T, and what is the formula?

The reset timeout period on MAX6340UK31/V+T is set by connecting a capacitor (CSRT) between the SRT pin and GND. The relationship is tRP = (2.73 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 1500pF capacitor yields a typical timeout of 4.375ms. Ceramic capacitors with leakage <10nA are strongly recommended.

Is MAX6340UK31/V+T pin-compatible with any industry-standard alternatives?

Yes, MAX6340UK31/V+T is explicitly documented as pin-compatible with the LP3470. Both devices share identical 5-pin SOT23-5 pinout (GND, VCC, SRT, N.C., RESET), enabling drop-in replacement in existing designs where the LP3470 was used-provided the 3.075V threshold and AEC-Q100 qualification meet system requirements.

What is the maximum transient duration that MAX6340UK31/V+T can ignore without asserting reset?

MAX6340UK31/V+T can ignore negative-going VCC transients up to 50µs in duration when the overdrive is 100mV below the 3.075V threshold (i.e., down to ~2.975V). This immunity is characterized per Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive" and validated under AEC-Q100 stress testing for automotive robustness.