Analog Devices Inc./Maxim Integrated MAX6365LKA23

Overview

MAX6365LKA23 from Maxim Integrated is a low-power microprocessor supervisory circuit with manual reset input, 2.32V factory-preset reset threshold, push-pull active-low RESET output, and integrated battery-backup switchover for CMOS RAM retention. It operates from 1.2V to 5.5V, delivers ≤10µA quiescent current, and guarantees RESET assertion down to 1.2V supply - enabling reliable power monitoring in portable battery-powered equipment.

For engineers reviewing the MAX6365LKA23 datasheet, MAX6365LKA23 pinout, MAX6365LKA23 application, or MAX6365LKA23 equivalent, key selection criteria include its 2.32V reset threshold accuracy, 150ms minimum reset timeout, on-board chip-enable gating with 1.5ns propagation delay, and SOT23-8 package compatibility with space-constrained µP systems requiring deterministic brownout recovery and nonvolatile memory write protection.

Technical Context

The MAX6365LKA23 integrates four core functions: (1) precision VCC monitoring with ±1.5% threshold tolerance over temperature; (2) automatic VCC-to-battery switchover when VCC falls below both VTH and VBATT by ≥20mV; (3) MR-initiated reset with internal 20kΩ pullup and debounced timing; and (4) CE IN/CE OUT transmission gate enabling SRAM write protection during fault conditions.

Its reset generator asserts active-low RESET continuously while VCC < 2.32V or MR is low, then holds asserted for ≥150ms after VCC rises above threshold or MR transitions high. The chip-enable path remains functional only when reset is deasserted, with 12µs hold time if CE IN is low at reset assertion - ensuring safe SRAM access termination during power failure.

Key Specifications

Pinout & Package

MAX6365LKA23 is housed in an 8-pin SOT23-8 package (2.9mm × 1.6mm × 1.1mm), optimized for PCB area-constrained applications. Pin 1 is marked with a dot; top view orientation follows JEDEC MO-178 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6365PKA23 and TPS3808G125DBVR, MAX6365LKA23 uniquely combines push-pull reset drive, integrated battery switchover, and CE gating in one SOT23-8 package - eliminating three discrete functions required by alternatives.

Availability

MAX6365LKA23 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, retail POS terminals, and smart energy meters requiring stable component supply with long-term lifecycle support.

Supply support for MAX6365LKA23 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 management, sensing, and connectivity in demanding industrial, automotive, and computing applications.

The MAX6365 family delivers integrated µP supervision with battery backup and memory write protection - targeting space-constrained, battery-operated systems where reliability, low quiescent current, and deterministic fault response are critical.

FAQ

What is the factory-set reset threshold voltage for MAX6365LKA23?

The MAX6365LKA23 has a factory-preset reset threshold of 2.32V (typical), with guaranteed range of 2.25V to 2.38V over -40°C to +85°C. This value is laser-trimmed during production and does not require external resistor programming. The threshold is referenced to VCC and remains stable across temperature and supply variations, making MAX6365LKA23 suitable for monitoring 2.5V logic rails with margin against brownout.

Does MAX6365LKA23 support battery backup for SRAM, and how does switchover work?

Yes, MAX6365LKA23 supports automatic battery backup for SRAM via its integrated VCC-to-BATT switchover circuit. When VCC drops below both the 2.32V reset threshold and VBATT by at least 20mV, the internal MOSFET connects BATT to OUT. Switchover includes 40mV hysteresis to prevent oscillation during slow VCC decay. In backup mode, MAX6365LKA23 draws only 3µA from the battery (at VBATT = 2.8V), enabling multi-year retention without external circuitry.

What is the function of the MR pin on MAX6365LKA23, and does it require external components?

The MR (Manual Reset) pin on MAX6365LKA23 provides user-initiated reset capability: holding MR low asserts RESET, which remains active for ≥150ms after MR returns high. MAX6365LKA23 includes an internal 20kΩ pullup resistor to VCC, so no external pullup is required. A momentary switch from MR to GND suffices for manual reset; optional 0.1µF capacitor to GND adds noise immunity in electrically noisy environments.

How does the chip-enable gating feature of MAX6365LKA23 protect SRAM during power faults?

MAX6365LKA23's chip-enable gating blocks erroneous SRAM writes during power faults by disconnecting CE IN from CE OUT when RESET is asserted. If CE IN is low at reset assertion, CE OUT stays low for 12µs to complete ongoing memory access; otherwise, CE OUT follows CE IN with 1.5ns propagation delay. This ensures no partial or corrupted writes occur during brownout, power-up, or manual reset - preserving data integrity without software intervention.

What package type and pin count does MAX6365LKA23 use, and is it RoHS-compliant?

MAX6365LKA23 uses an 8-pin SOT23-8 package (2.9mm × 1.6mm × 1.1mm) with lead (Pb)-free, RoHS-compliant finish. The package meets JEDEC MO-178 standards and is compatible with standard reflow soldering profiles. Pin 1 is marked with a dot; the top-view pinout matches Maxim's official datasheet diagram for MAX6365 variants. No special handling or moisture sensitivity precautions are required beyond standard MSL-1 guidelines.