Analog Devices Inc./Maxim Integrated MAX6365LKA26-T

Overview

The MAX6365LKA26-T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery backup, chip-enable gating, and manual reset input. It monitors VCC supply voltage (reset threshold 2.63 V), provides active-low open-drain RESET output, switches OUT between VCC and backup battery (VBATT) during brownout, and gates CE signals with 1.5 ns propagation delay. It operates from 1.2 V to 5.5 V and supports critical µP systems requiring reliable power-up/down sequencing and SRAM data retention.

For engineers reviewing the MAX6365LKA26-T datasheet, MAX6365LKA26-T pinout, MAX6365LKA26-T application, or MAX6365LKA26-T equivalent, key selection criteria include its factory-set 2.63 V reset threshold, SOT23-8 package, 150 ms minimum reset timeout, 10 µA quiescent current, and integrated debounced manual reset input - all validated for portable equipment, industrial controllers, and POS terminals with battery-backed memory.

Technical Context

The MAX6365LKA26-T implements a precision voltage monitor with ±1.5% reset threshold accuracy over temperature, coupled with an internal transmission gate for CE signal gating that remains enabled during normal operation but disables during reset assertion to prevent erroneous writes to CMOS RAM. Its battery switchover logic requires both VCC < VTH and VCC < VBATT − 20 mV to engage, with 40 mV hysteresis to prevent oscillation during slow VCC decay.

It integrates a debounced manual reset input (MR) with 20 kΩ internal pullup to VCC, guaranteeing RESET assertion for ≥150 ms after MR transitions high. The open-drain RESET output is valid down to 1.2 V on either VCC or VBATT, enabling robust operation in ultra-low-voltage backup scenarios.

Key Specifications

Pinout & Package

MAX6365LKA26-T is housed in an 8-pin SOT23 package (2.9 mm × 1.6 mm × 1.1 mm), optimized for space-constrained portable and industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6365LKA26-T, MAX6365PKA26-T offers identical supervision functionality but different reset polarity and drive strength, while TPS3808G26DBVR trades integrated battery/CE features for ultra-low quiescent current and simplified layout where those functions are unnecessary.

Availability

MAX6365LKA26-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, and point-of-sale terminals requiring stable component supply across extended product lifecycles.

Supply support for MAX6365LKA26-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) designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications in industrial, automotive, and computing markets.

The MAX6365 family delivers integrated power-supply monitoring, battery backup, and memory write protection for µP-based systems where board space, reliability, and low-power operation are critical design constraints.

FAQ

What is the exact reset threshold voltage of the MAX6365LKA26-T?

The MAX6365LKA26-T has a factory-trimmed reset threshold of 2.63 V (typical), with guaranteed range of 2.55 V to 2.70 V over −40°C to +85°C. This value is laser-trimmed during production and does not require external components. The MAX6365LKA26-T uses this precise threshold to detect brownout conditions on 2.5 V logic rails, ensuring reliable µP reset initiation before functional failure occurs.

Does the MAX6365LKA26-T support battery backup switchover, and what are the engagement conditions?

Yes, the MAX6365LKA26-T automatically switches OUT from VCC to VBATT when two conditions are met: VCC falls below the 2.63 V reset threshold and VBATT exceeds VCC by at least 20 mV. The device maintains 40 mV hysteresis to prevent oscillation during slow VCC decay. During switchover, MAX6365LKA26-T draws only 3 µA from the battery (VBATT = 2.8 V, VCC = 0 V), enabling multi-year operation on standard coin cells.

What type of reset output does the MAX6365LKA26-T provide, and how is it configured?

The MAX6365LKA26-T provides an active-high open-drain RESET output (Pin 1). It asserts high when VCC < 2.63 V, MR is pulled low, or during the 150–280 ms reset timeout period. Because it is open-drain, the MAX6365LKA26-T requires an external pullup resistor to the target logic supply (e.g., 3.3 V or 5 V) to establish valid logic levels. This configuration allows wired-OR reset bus sharing across multiple supervisors.

How does the manual reset input (MR) on the MAX6365LKA26-T work, and is external debounce required?

The MR input on the MAX6365LKA26-T is internally debounced and features a 20 kΩ pullup resistor to VCC. Pulling MR low asserts RESET continuously; RESET remains asserted for ≥150 ms after MR returns high. No external RC network is needed - a simple momentary switch from MR to GND suffices. This eliminates BOM cost and layout area typically required for discrete debounce circuits, simplifying design for consumer and industrial end equipment using MAX6365LKA26-T.

Can the MAX6365LKA26-T be used without a backup battery, and how should BATT be connected?

Yes, the MAX6365LKA26-T operates fully without a backup battery. In this configuration, connect BATT directly to GND and tie OUT to VCC. The internal battery switchover circuitry remains inactive, and MAX6365LKA26-T functions solely as a reset supervisor and CE gate. All other features - including 2.63 V monitoring, MR input, and 1.5 ns CE propagation - remain fully operational, making it suitable for cost-sensitive applications where data retention during power loss is not required.