Analog Devices Inc./Maxim Integrated MAX6367PKA46+T

Overview

MAX6367PKA46+T from Maxim Integrated is a battery-backup supervisory circuit with BATT ON indicator output, precision 4.63V reset threshold, open-drain active-low RESET, and chip-enable gating for CMOS RAM protection in microprocessor systems. It operates from 1.2V to 5.5V, delivers ≤10µA quiescent current, and supports VCC-to-BATT switchover with 40mV hysteresis for reliable SRAM backup during brownout.

For engineers reviewing the MAX6367PKA46+T datasheet, MAX6367PKA46+T pinout, MAX6367PKA46+T application, or MAX6367PKA46+T equivalent, key selection criteria include its factory-trimmed 4.63V reset threshold (±13mV), guaranteed RESET assertion down to 1.2V supply, 150ms minimum reset timeout, BATT ON push-pull status indicator, and integrated CE gating with 1.5ns propagation delay.

Technical Context

The MAX6367PKA46+T implements a precision voltage monitor with internal 4.63V reference (min 4.50V, max 4.75V) and comparator-based reset generation. Its BATT ON output asserts high only when VCC falls below both the reset threshold and VBATT-ensuring unambiguous battery-backup mode indication.

Chip-enable gating uses a transmission gate between CE IN and CE OUT, disabled during reset to prevent erroneous writes to SRAM. The 12µs CE OUT hold time after CE IN low assertion during reset ensures completion of memory access cycles before isolation.

Key Specifications

Pinout & Package

MAX6367PKA46+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), compatible with standard reflow profiles and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6367HKA46+T, the MAX6367PKA46+T offers open-drain flexibility for wired-OR reset buses; compared with TPS3808G33DBVR, it delivers full battery-backup supervision with integrated status signaling and memory write lockout-enabling single-chip solutions where reliability and feature integration are critical.

Availability

MAX6367PKA46+T is available at Aetrix Electronics and suitable for industrial PLCs, POS terminals, set-top boxes, and medical infusion pumps requiring stable component supply with long-term lifecycle support and traceable sourcing.

Supply support for MAX6367PKA46+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, computing, and communications markets.

The MAX6365–MAX6368 family was engineered specifically for microprocessor system supervision with integrated battery backup, memory write protection, and configurable reset functions-targeting space- and power-constrained embedded devices.

FAQ

What is the exact reset threshold voltage of the MAX6367PKA46+T?

The MAX6367PKA46+T has a factory-trimmed reset threshold of 4.63V (typical), with guaranteed limits of 4.50V (min) and 4.75V (max) across temperature and process variation. This value is permanently laser-trimmed during manufacturing and applies specifically to the "46" suffix variant, making it suitable for monitoring nominal +5V power rails with tight tolerance requirements.

Does the MAX6367PKA46+T support battery switchover for voltages below 3.0V?

Yes, the MAX6367PKA46+T supports battery switchover with VBATT as low as 2.0V. When VCC drops below both the 4.63V threshold and VBATT, the internal MOSFET connects BATT to OUT. The device guarantees proper operation down to 1.2V VCC or VBATT, and the BATT ON output remains valid even at VBATT = 2.1V (with 0.4V saturation voltage).

How does the BATT ON output behave during power transitions?

The BATT ON output of the MAX6367PKA46+T is a push-pull active-high signal that asserts high only when two conditions are simultaneously met: VCC < 4.63V AND VCC < VBATT − 20mV. It deasserts immediately when VCC rises above either condition. This dual-criteria design eliminates false triggers during partial brownouts and ensures unambiguous backup-mode indication.

Can the MAX6367PKA46+T be used without a backup battery?

Yes, the MAX6367PKA46+T operates fully without a backup battery. In this configuration, connect BATT to GND and OUT to VCC. All supervision functions-including reset generation, CE gating, and BATT ON (which remains low)-remain active. The device draws only 10µA quiescent current, making it viable for cost-sensitive applications where battery backup is optional.

What is the purpose of the unused RESET IN pin on the MAX6367PKA46+T?

The RESET IN pin (Pin 5) on the MAX6367PKA46+T is not functional-it belongs to the MAX6368 variant family and is unconnected internally. Per Maxim's pin description, this pin must be left floating or tied to GND; driving it may cause undefined behavior. Its presence reflects shared package and pinout across the MAX6365–MAX6368 series, not multi-function capability.