Analog Devices Inc./Maxim Integrated MAX6365PKA23+

Overview

MAX6365PKA23+ from Maxim Integrated is a low-power microprocessor supervisory circuit with battery backup switching, chip-enable gating, and debounced manual reset input. It operates from 1.2V to 5.5V, features a factory-preset 2.32V reset threshold, 150ms minimum reset timeout, and delivers ≤10µA quiescent current. It is used in portable equipment, POS terminals, and industrial controllers to ensure reliable µP startup and data retention during power failure.

For engineers reviewing the MAX6365PKA23+ datasheet, MAX6365PKA23+ pinout, MAX6365PKA23+ application, or MAX6365PKA23+ equivalent, key selection criteria include reset threshold accuracy (2.25V–2.38V), open-drain active-low RESET output, 8-pin SOT23 package compatibility, battery switchover hysteresis (±20mV), and CE IN-to-CE OUT propagation delay (≤9ns).

Technical Context

The MAX6365PKA23+ integrates four core functions: precise VCC monitoring with brownout detection, automatic VCC-to-battery switchover via internal MOSFET (RON ≤4.6Ω at 2.38V), chip-enable signal gating with 1.5ns propagation delay, and debounced manual reset input with 20kΩ internal pullup. Its reset generator guarantees valid RESET assertion down to 1.2V supply.

It implements a fixed-threshold comparator architecture with no external resistor programming, supports CMOS RAM backup up to 150mA from VCC or battery, and maintains CE OUT logic integrity during reset via 12µs hold time when CE IN is low at reset assertion.

Key Specifications

Pinout & Package

MAX6365PKA23+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead(Pb)-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6365PKA23+, MAX6365LKA23+ offers identical supervision and battery features but different reset polarity and drive strength, while TPS3808G125DBVR sacrifices CE gating, battery switchover, and manual reset to achieve lower quiescent current and smaller footprint - making it unsuitable for SRAM backup or robust fault containment.

Availability

MAX6365PKA23+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, retail POS terminals, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for MAX6365PKA23+ 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–MAX6368 family targets space-constrained µP systems needing integrated power monitoring, battery backup, and memory write protection - delivering all three functions in a single 8-pin SOT23 package.

FAQ

What is the reset threshold voltage of the MAX6365PKA23+?

The MAX6365PKA23+ has a factory-preset reset threshold of 2.32V (typical), with a guaranteed range of 2.25V to 2.38V over temperature. This value is laser-trimmed during production and applies to VCC monitoring only - it does not require external resistors or calibration. The threshold remains stable across the full -40°C to +85°C operating range, with typical drift of less than ±10mV.

Does the MAX6365PKA23+ support battery backup switchover?

Yes, the MAX6365PKA23+ supports automatic battery backup switchover. When VCC falls below the reset threshold and drops at least 20mV below VBATT, the internal MOSFET connects BATT to OUT. The device maintains this state until VCC rises 20mV above VBATT. In backup mode, MAX6365PKA23+ draws only 3µA from the battery (at VBATT = 2.8V, VCC = 0V), enabling multi-year operation on standard coin cells.

What is the function of the CE IN and CE OUT pins on the MAX6365PKA23+?

CE IN and CE OUT implement chip-enable signal gating to prevent erroneous writes to CMOS RAM during power faults. During normal operation, CE IN passes directly to CE OUT with ≤9ns propagation delay. When reset asserts and CE IN is low, CE OUT is held low for 12µs to complete ongoing memory access. If CE IN is high at reset assertion, CE OUT remains high - ensuring data integrity without software intervention.

Can the MAX6365PKA23+ operate from a 1.2V supply?

Yes, the MAX6365PKA23+ operates from VCC as low as 1.2V. Its internal circuitry remains fully functional, and both RESET and CE OUT outputs are guaranteed to meet logic thresholds down to this voltage. The 10µA maximum supply current at 5.5V scales linearly, resulting in ~2.2µA typical consumption at 1.2V - making MAX6365PKA23+ suitable for ultra-low-power always-on monitoring in battery-backed systems.

Is the MR input on the MAX6365PKA23+ internally debounced?

Yes, the MR (manual reset) input on the MAX6365PKA23+ includes internal debounce circuitry and a 20kΩ pullup resistor to VCC. A logic-low pulse as short as 1µs on MR will assert reset, and the internal timing ensures the reset remains active for ≥150ms after MR returns high. No external capacitor or resistor is required - simplifying PCB layout and eliminating bounce-related firmware errors in user-initiated reset scenarios.