Analog Devices Inc./Maxim Integrated MAX6367PKA29/V+T

Overview

The MAX6367PKA29/V+T from Maxim Integrated is a battery-backup supervisory IC for microprocessor systems, providing active-high BATT ON indicator output, 2.93V factory-preset reset threshold, 150ms minimum reset timeout, and chip-enable gating with 1.5ns propagation delay. It operates from 1.2V to 5.5V supply and supports CMOS RAM backup during VCC brownout in industrial controllers and POS terminals.

For engineers reviewing the MAX6367PKA29/V+T datasheet, MAX6367PKA29/V+T pinout, MAX6367PKA29/V+T application, or MAX6367PKA29/V+T equivalent, key selection criteria include BATT ON push-pull drive capability, 2.93V ±70mV reset threshold accuracy over -40°C to +85°C, battery-switchover hysteresis of 40mV, and guaranteed RESET/RESET operation down to 1.2V supply.

Technical Context

This device integrates a precision voltage monitor, battery switchover MOSFET controller, and BATT ON status indicator in an 8-pin SOT23 package. Its internal comparator compares VCC against a trimmed 2.93V threshold (±70mV), triggering reset when VCC falls below that level and maintaining assertion for ≥150ms after recovery.

The BATT ON output is a push-pull driver that asserts high only during battery-backup mode-i.e., when VCC < VTH and VCC < VBATT − 20mV-and sinks 3.2mA at 0.4V saturation. Chip-enable gating uses a transmission gate with 20Ω–100Ω on-resistance and 12µs reset-to-CE OUT delay to protect SRAM write operations during power faults.

Key Specifications

Pinout & Package

Package: 8-pin SOT23, surface-mount, lead(Pb)-free (denoted by "+T" suffix), automotive qualified (/V).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6367PKA29/V+T, MAX6367HKA29/V+T offers higher RESET drive strength but identical supervision logic and BATT ON behavior, while TPS3808G33DBVR omits battery management entirely and serves simpler single-rail monitoring needs.

Availability

MAX6367PKA29/V+T is available at Aetrix Electronics and suitable for industrial control systems, point-of-sale terminals, and automotive infotainment modules requiring stable component supply with automotive qualification and long-term lifecycle support.

Supply support for MAX6367PKA29/V+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 product line delivers ultra-low-power supervisory circuits with integrated battery switchover, chip-enable gating, and application-specific outputs (e.g., BATT ON) for reliable µP system power management.

FAQ

What is the reset threshold voltage of the MAX6367PKA29/V+T?

The MAX6367PKA29/V+T has a factory-trimmed reset threshold of 2.93V with ±70mV tolerance over the full -40°C to +85°C temperature range. This value is specified in the Reset Threshold Ranges table and confirmed in the Electrical Characteristics section under VTH parameter for suffix "29". The MAX6367PKA29/V+T uses this precise threshold to detect brownout on 3.3V supply rails before system instability occurs.

Does the MAX6367PKA29/V+T provide battery-backup switchover functionality?

Yes, the MAX6367PKA29/V+T provides automatic battery-backup switchover: when VCC falls below 2.93V and also drops below VBATT − 20mV, the internal MOSFET connects BATT to OUT to maintain power to attached SRAM. The device includes 40mV hysteresis to prevent oscillation during slow VCC decay. This function is fully operational in the MAX6367PKA29/V+T and documented in the Detailed Description and Table 1 sections of the datasheet.

What is the purpose of the BATT ON pin on the MAX6367PKA29/V+T?

The BATT ON pin on the MAX6367PKA29/V+T is a push-pull active-high output that asserts high exclusively during battery-backup mode - i.e., when VCC < VTH and VCC < VBATT − 20mV. It sinks 3.2mA at 0.4V saturation and can directly drive LEDs or base/gate terminals of external pass transistors. This feature enables visual status indication and extended current capability beyond the internal switch's 20mA limit, as described in Figure 3 and the BATT ON Indicator section.

How does the chip-enable gating function work in the MAX6367PKA29/V+T?

The MAX6367PKA29/V+T implements chip-enable gating using a transmission gate between CE IN and CE OUT. During normal operation, CE IN passes through to CE OUT with 1.5ns propagation delay and 20Ω–100Ω on-resistance. When reset asserts, CE OUT is held low for 12µs if CE IN was low, then actively pulled high to OUT. This prevents erroneous writes to SRAM during power faults, as detailed in the Chip-Enable Signal Gating section and Figure 1 timing diagram.

Is the MAX6367PKA29/V+T qualified for automotive applications?

Yes, the "/V" suffix in MAX6367PKA29/V+T denotes automotive qualification per AEC-Q100 standards. The device is rated for -40°C to +85°C operation, features enhanced ESD protection, and undergoes stress testing for temperature cycling, humidity, and mechanical shock. This qualification is explicitly stated in the Ordering Information table and supported by the "Automotive Qualified" designation in the device marking codes section.