Analog Devices Inc./Maxim Integrated MAX6365HKA26-T

Overview

MAX6365HKA26-T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery backup switching, chip-enable gating, and factory-preset 2.63V reset threshold. It provides active-high open-drain RESET output, monitors VCC down to 1.2V, delivers ≤10µA quiescent current, and supports CMOS RAM write protection in brownout conditions - used in portable POS terminals and industrial controllers requiring reliable power-fail response.

For engineers reviewing the MAX6365HKA26-T datasheet, MAX6365HKA26-T pinout, MAX6365HKA26-T application, or MAX6365HKA26-T equivalent, key selection criteria include its 2.55V–2.70V reset threshold range, SOT23-8 package, 150ms minimum reset timeout, battery-switchover hysteresis (±20mV), and CE IN-to-CE OUT propagation delay of 1.5ns–9ns depending on load.

Technical Context

The MAX6365HKA26-T implements a precision voltage monitor with internal 2.63V threshold comparator, integrated MOSFET-based VCC/BATT switchover logic, and transmission-gate-based chip-enable gating with 12µs reset-to-CE OUT delay. Its RESET output remains asserted high during VCC undervoltage, MR assertion, or after manual reset release for ≥150ms.

It operates across -40°C to +85°C with guaranteed RESET/RESET validity down to 1.2V supply, supports debounced manual reset via internal 20kΩ pullup on MR, and features 1.5ns CE propagation delay under 50Ω/50pF conditions - enabling compatibility with fast µP address/data buses.

Key Specifications

Pinout & Package

MAX6365HKA26-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount compatible with standard reflow profiles and IPC-7351B footprint MS-012AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6365PKA26-T and TPS3808G125DBVR, MAX6365HKA26-T uniquely combines battery switchover, chip-enable gating, and active-high open-drain RESET in a single SOT23-8 device - making it optimal for space-constrained, dual-supply µP systems requiring data retention during power loss.

Availability

MAX6365HKA26-T is available at Aetrix Electronics and suitable for industrial control PLCs, portable POS terminals, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6365HKA26-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 management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6365–MAX6368 family targets µP-based systems needing integrated power monitoring, battery backup, and memory write protection - delivering size, accuracy, and reliability improvements over discrete solutions.

FAQ

What is the reset threshold voltage of the MAX6365HKA26-T?

The MAX6365HKA26-T has a factory-preset reset threshold of 2.63V (minimum 2.55V, maximum 2.70V). This value is laser-trimmed during production and applies across the full -40°C to +85°C operating temperature range. The threshold is optimized for monitoring 2.5V power rails and ensures reliable detection of brownout conditions without external components. The '26' suffix in the part number directly encodes this 2.63V specification.

Does the MAX6365HKA26-T support battery backup functionality?

Yes, the MAX6365HKA26-T fully supports battery backup. When VCC falls below the 2.63V reset threshold and VBATT exceeds VCC by at least 20mV, the internal MOSFET automatically switches the OUT pin from VCC to BATT. In backup mode, it draws only 3µA from the battery (at VBATT = 2.8V), enabling multi-year operation on coin cells. The device also provides CE gating to prevent SRAM corruption during switchover.

What type of reset output does the MAX6365HKA26-T provide?

The MAX6365HKA26-T provides an active-high open-drain RESET output (pin 1). This means the output pulls high only when externally pulled up - allowing wired-OR connection with other reset sources. It asserts high continuously during VCC undervoltage, MR assertion, or after manual reset release for ≥150ms. The 'H' in the part number denotes the active-high output variant, distinguishing it from 'L' (push-pull active-low) and 'P' (open-drain active-low) versions.

How does the manual reset (MR) input function on the MAX6365HKA26-T?

The MR input (pin 4) on the MAX6365HKA26-T is debounced internally and features a 20kΩ pullup resistor to VCC. Driving MR low asserts RESET high, and the reset remains active for at least 150ms after MR returns high. No external RC network is required - a simple momentary switch from MR to GND suffices. This design eliminates board-level components while ensuring noise immunity in industrial environments.

What is the purpose of the CE IN and CE OUT pins on the MAX6365HKA26-T?

The CE IN (pin 2) and CE OUT (pin 8) pins implement chip-enable signal gating to protect CMOS RAM during power faults. During normal operation, CE IN passes through to CE OUT with ≤9ns propagation delay. When RESET asserts, CE OUT is disabled - preventing spurious memory writes. If CE IN is low during reset, CE OUT stays low for 12µs to complete ongoing memory cycles, then goes high. This ensures data integrity without µP firmware changes.