Analog Devices Inc./Maxim Integrated MAX6365PKA44+

Overview

MAX6365PKA44+ 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 4.38V reset threshold (±0.13V), 150ms minimum reset timeout, 10µA quiescent current, and delivers up to 150mA from VCC or battery during switchover - used in portable POS terminals and industrial controllers requiring reliable power-fail recovery.

For engineers reviewing the MAX6365PKA44+ datasheet, MAX6365PKA44+ pinout, MAX6365PKA44+ application, or MAX6365PKA44+ equivalent, this page provides verified functional identity, SOT23-8 pin mapping, battery-switchover timing behavior, CE-gating propagation delay (≤9ns), and validated alternative parts for µP reset and memory write protection in brownout-prone systems.

Technical Context

The MAX6365PKA44+ integrates four core functions: precision voltage monitoring (4.38V threshold), VCC-to-battery switchover with 40mV hysteresis, internal chip-enable signal gating (1.5ns propagation delay), and debounced manual reset input with 20kΩ internal pullup. Its reset generator guarantees assertion down to 1.2V supply and holds active for ≥150ms after VCC recovery.

It uses an internal MOSFET for battery switchover, with VCC-to-OUT on-resistance of 4.6Ω at 2.38V/25mA and BATT-to-OUT on-resistance dependent on battery voltage. The CE IN–CE OUT path employs a transmission gate disabled during reset to prevent SRAM corruption during power faults.

Key Specifications

Pinout & Package

MAX6365PKA44+ is housed in an 8-pin SOT23-8 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, with exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6365HKA44+, the MAX6365PKA44+ offers open-drain active-high reset for flexible bus-level signaling, while TPS3808G33DBVR provides lower quiescent current but omits critical battery management and CE control - making it unsuitable as a drop-in replacement in memory-retention-critical designs.

Availability

MAX6365PKA44+ is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLC controllers, medical handheld diagnostics, and smart energy meters requiring stable component supply with long-term lifecycle support.

Supply support for MAX6365PKA44+ 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 was engineered specifically for µP-based systems needing integrated power supervision, battery switchover, and hardware-enforced memory write protection - targeting space-constrained, battery-sensitive applications.

FAQ

What is the exact reset threshold voltage for MAX6365PKA44+?

The MAX6365PKA44+ has a factory-trimmed reset threshold of 4.38V (typical), with a guaranteed range of 4.25V to 4.50V across temperature and supply conditions. This value is laser-trimmed during production and does not require external adjustment - enabling precise supervision of +5V or +3.3V rails without calibration. The MAX6365PKA44+ maintains this threshold accuracy over -40°C to +85°C.

Does MAX6365PKA44+ support battery backup for SRAM, and how does switchover work?

Yes, MAX6365PKA44+ supports automatic battery backup for SRAM via its integrated VCC/BATT switchover circuit. When VCC falls below 4.38V *and* drops at least 20mV below VBATT, the device disconnects VCC from OUT and connects BATT instead. The 40mV hysteresis prevents oscillation during slow voltage transitions. In backup mode, MAX6365PKA44+ delivers up to 10mA from the battery while consuming only 3µA itself.

What is the function of the CE IN and CE OUT pins on MAX6365PKA44+?

The CE IN and CE OUT pins implement hardware-enforced chip-enable gating to prevent SRAM write corruption during power faults. During normal operation, CE IN passes directly to CE OUT with ≤9ns delay. When reset asserts, CE OUT is forced low for 12µs to complete any active memory cycle, then held high (pulled to OUT) - blocking further writes until power stabilizes. This feature is intrinsic to MAX6365PKA44+ and requires no firmware intervention.

Can MAX6365PKA44+ operate from a 1.2V supply, and what happens to reset functionality at low voltage?

Yes, MAX6365PKA44+ operates down to 1.2V VCC and guarantees valid RESET/RESET output states even at that level. Its internal bandgap reference and reset comparator remain functional, ensuring continuous supervision during ultra-low-power modes. At VCC = 1.2V, the device draws only 15µA and maintains full reset assertion capability - critical for maintaining system integrity in energy-harvesting or deep-sleep applications using MAX6365PKA44+.

Is the MR (manual reset) input on MAX6365PKA44+ debounced, and does it require external components?

Yes, the MR input on MAX6365PKA44+ is internally debounced and includes a 20kΩ pullup resistor to VCC - eliminating the need for external RC networks or Schmitt-trigger buffers. A logic-low pulse ≥1µs on MR triggers a full reset sequence, holding RESET high for ≥150ms after MR returns high. This integrated debounce makes MAX6365PKA44+ ideal for compact, cost-sensitive designs like handheld scanners and IoT edge nodes.