Analog Devices Inc./Maxim Integrated MAX6365PKA23+T

Overview

The MAX6365PKA23+T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup switching, chip-enable gating, and manual reset input. It operates from 1.2V to 5.5V, features a factory-preset 2.32V reset threshold, 150ms minimum reset timeout, 10µA quiescent current, and delivers up to 150mA from VCC or backup battery - used in portable POS terminals and industrial controllers for reliable power-up/down/brownout reset and SRAM data retention.

For engineers reviewing the MAX6365PKA23+T datasheet, MAX6365PKA23+T pinout, MAX6365PKA23+T application, or MAX6365PKA23+T equivalent, key selection criteria include its SOT23-8 package, open-drain active-low RESET output, 2.32V reset threshold tolerance (±0.06V), CE IN/CE OUT 1.5ns propagation delay, and guaranteed RESET assertion down to 1.2V supply.

Technical Context

This device integrates four core functions: (1) precision VCC monitoring with ±1.5% threshold accuracy over temperature; (2) seamless VCC-to-battery switchover via internal MOSFET with <4.6Ω on-resistance at 2.38V; (3) chip-enable signal gating with 1.5ns propagation delay and 20–100Ω transmission-gate resistance; and (4) debounced manual reset input with 20kΩ internal pullup and 120ns MR-to-RESET delay.

It supports battery-backup mode only when VCC falls below both the reset threshold (2.32V) and VBATT by ≥20mV, with hysteresis preventing oscillation during slow VCC decay. The CE OUT remains actively pulled up to OUT during reset, ensuring CMOS RAM write protection even under fault conditions.

Key Specifications

Pinout & Package

Package: 8-pin SOT23, 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 MAX6365LKA23+T, the MAX6365PKA23+T offers identical supervision functionality but optimized for volume tape-and-reel procurement; versus TPS3808G125DBVR, it adds essential battery switchover and CE gating for data-critical embedded systems - making it irreplaceable where SRAM integrity is mandatory.

Availability

MAX6365PKA23+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLC controllers, and medical handheld monitors requiring stable component supply and long-term lifecycle support.

Supply support for MAX6365PKA23+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 in demanding industrial and embedded applications.

The MAX6365–MAX6368 family was engineered specifically for µP-based systems needing integrated power monitoring, battery backup, and memory write protection - targeting space-constrained, battery-sensitive equipment like handheld meters and controllers.

FAQ

What is the exact reset threshold voltage for MAX6365PKA23+T?

The MAX6365PKA23+T has a factory-trimmed reset threshold of 2.32V (minimum), 2.38V (maximum), with 2.32V typical - specified across -40°C to +85°C. This value is fixed per the "23" suffix in the part number and applies to all units regardless of temperature or supply condition. The MAX6365PKA23+T uses this threshold to assert RESET whenever VCC falls below it during power-up, power-down, or brownout events.

Does MAX6365PKA23+T support battery-backup operation with lithium coin cells?

Yes, the MAX6365PKA23+T supports battery-backup operation with standard 3V lithium coin cells (e.g., CR2032). Its VBATT input accepts 2.0V to 5.5V, and the device draws only 3µA (typical) from the battery in backup mode at VBATT = 2.8V. The MAX6365PKA23+T automatically switches OUT from VCC to BATT when VCC drops below both the 2.32V threshold and VBATT by ≥20mV, preserving SRAM data without external circuitry.

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

The CE IN and CE OUT pins on MAX6365PKA23+T implement hardware write-protection for CMOS RAM. During normal operation, CE IN passes directly to CE OUT with 1.5ns delay. When RESET asserts, CE OUT is gated off - 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. This prevents corrupted writes during power faults. The MAX6365PKA23+T uses this feature to safeguard configuration and log data in mission-critical systems.

Can MAX6365PKA23+T generate a reset pulse from a pushbutton without external components?

Yes, the MAX6365PKA23+T includes a debounced manual reset input (MR) with an internal 20kΩ pullup resistor to VCC. Connecting a normally open momentary switch between MR and GND generates a clean reset pulse - no external resistors, capacitors, or Schmitt triggers are required. Reset remains asserted while the button is pressed and for ≥150ms after release, satisfying µP reset timing requirements. This integrated MR functionality is a defining feature of the MAX6365PKA23+T within the MAX6365–MAX6368 family.

Is MAX6365PKA23+T pin-compatible with other devices in the MAX6365–MAX6368 family?

Yes, all MAX6365–MAX6368 variants - including MAX6365PKA23+T, MAX6366PKA23+T, and MAX6368PKA23+T - share identical 8-pin SOT23 pinouts and footprint. Pin-for-pin compatibility enables design reuse across supervision variants (manual reset, watchdog, battery-on, or adjustable reset input) without PCB changes. However, functional differences (e.g., WDI on pin 4 for MAX6366) mean firmware and external connections must match the selected variant. The MAX6365PKA23+T retains MR on pin 4, consistent with its manual-reset role.