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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX6368LKA46+T

Name: MAX6368LKA46+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6368LKA46+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6368LKA46+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: SOT-23-8

Datasheet:: MAX6368LKA46+T.pdf

Description:: IC SUPERVISOR MPU LP SOT23-8

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Product details

Overview

The MAX6368LKA46+T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, 4.63V factory-preset V_CC reset threshold, open-drain active-high RESET output, and integrated chip-enable gating for CMOS RAM protection. It operates from 1.2V to 5.5V, delivers <10µA quiescent current, and supports battery-backup switchover with 150ms minimum reset timeout - used in portable POS terminals, industrial controllers, and set-top boxes requiring reliable power-fail recovery.

For engineers reviewing the MAX6368LKA46+T datasheet, MAX6368LKA46+T pinout, MAX6368LKA46+T application, or MAX6368LKA46+T equivalent, key selection criteria include its 1.235V RESET IN comparator threshold, 1.5µs RESET IN-to-reset propagation delay, CE IN-to-CE OUT 2ns propagation (50Ω/50pF), and guaranteed RESET/RESET validity down to 1.2V supply.

Technical Context

The MAX6368LKA46+T implements a precision voltage-monitoring architecture with dual independent reset paths: one triggered by V_CC falling below 4.63V (±130mV over temperature), and another by RESET IN falling below 1.235V (±50mV). Its internal transmission gate provides chip-enable signal gating with 20–100Ω on-resistance and 12µs reset-to-CE OUT delay.

Battery switchover uses hysteresis-based control: OUT switches from V_CC to BATT when V_CC drops 20mV below VBATT, and reverts when V_CC rises 20mV above VBATT. The device guarantees functional operation at V_CC or VBATT ≥1.2V and supports up to 150mA V_CC-to-OUT sourcing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Reset Threshold	4.63V (factory preset, ±130mV over -40°C to +85°C) - ensures reliable reset assertion before 5V system brownout
RESET IN Threshold	1.235V (±50mV) - enables precise secondary supply monitoring via external resistor divider
Reset Timeout Period	150ms min - meets µP power-up stabilization requirements per JEDEC JESD79
Quiescent Supply Current	10µA max at V_CC = 5.5V - extends battery life in always-on backup mode
CE IN-to-CE OUT Delay	2ns typ (50Ω source, 50pF load) - compatible with high-speed µP address/data bus timing
V_CC/VBATT Operating Range	1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V logic domains without level shifters
RESET Output Type	Open-drain active-high - allows wired-OR configuration and flexible pull-up voltage selection

Pinout & Package

MAX6368LKA46+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, lead(Pb)-free.

Pin/Terminal	Circuit Role	Design Meaning
1 RESET	Active-high open-drain reset output	Asserts high during V_CC undervoltage, RESET IN low, or after reset timeout; requires external pull-down for active-low µP interface
2 CE IN	Chip-enable input	Controls CE OUT gating; low during normal operation to enable memory access; ignored during reset
3 GND	Ground reference	Common return path for V_CC, BATT, and signal pins; must be low-impedance for noise immunity
4 RESET IN	Auxiliary reset input	Compares to 1.235V internal reference; falling edge below threshold triggers reset with 1.5µs propagation
5 V_CC	Main supply input	Powers internal circuitry and sources OUT up to 150mA; reset asserts when voltage falls below 4.63V
6 OUT	Switched output	Sources from V_CC normally; automatically switches to BATT during brownout (if VBATT > V_CC +20mV)
7 BATT	Backup battery input	Provides backup power to OUT; draws <1µA standby current when V_CC = 0V and VBATT = 2.8V
8 CE OUT	Chip-enable output	Drives memory CE pin; low only when CE IN is low and reset is not asserted; pulled up to OUT during reset

Key Features

Feature	Design Value
Factory-trimmed 4.63V reset threshold	Eliminates external resistor network for primary 5V supply monitoring, reducing BOM count and layout area
1.235V precision RESET IN comparator	Enables accurate secondary supply monitoring (e.g., 3.3V or 2.5V rails) using two external resistors with <0.1% error contribution
150ms minimum reset timeout	Guarantees µP reset hold time exceeds typical crystal oscillator startup and PLL lock durations
On-board CE gating with 1.5ns propagation	Prevents spurious memory writes during power transitions without adding discrete logic or timing margin
10µA max supply current	Extends shelf life of battery-backed systems beyond 10 years when VBATT = 3.0V and no load
40mV switchover hysteresis	Prevents oscillatory switching between V_CC and BATT during slow V_CC ramp-down, ensuring clean memory power transition

Applications

POS Terminal Power Management	Industrial PLC Memory Protection
Use Scenario: Battery-backed receipt printer and cash drawer controller loses main AC power during transaction. IC Role / Device Role / Timing Role: MAX6368LKA46+T monitors 5V rail and asserts RESET to halt µP execution, gates CE to freeze SRAM, and switches OUT to backup battery within 20µs of V_CC drop. Use Value: Prevents partial transaction commits and preserves volatile sales data in 32KB SRAM for recovery after power restoration.	Use Scenario: Programmable logic controller operating in factory environment experiences 100ms brownout on 24VDC-to-5V conversion. IC Role / Device Role / Timing Role: MAX6368LKA46+T detects 5V sag below 4.63V, holds I/O state via CE gating, and maintains real-time clock and configuration registers using BATT. Use Value: Eliminates need for external supercapacitor or backup regulator, reducing board space by 35% versus discrete solution.
Set-Top Box Firmware Recovery	Medical Infusion Pump Safety Monitor
Use Scenario: Cable set-top box suffers intermittent 5V supply dropout during firmware update over DOCSIS channel. IC Role / Device Role / Timing Role: MAX6368LKA46+T uses RESET IN pin to monitor 3.3V analog tuner supply (programmed to 3.08V threshold), triggering full reset if tuner fails independently of main 5V rail. Use Value: Enables dual-rail fault detection, preventing corrupted firmware writes and enabling safe rollback to last known good image.	Use Scenario: Portable infusion pump relies on coin-cell backup to retain dose history and calibration constants during battery replacement. IC Role / Device Role / Timing Role: MAX6368LKA46+T provides 150ms reset hold and CE gating while switching OUT from depleted main battery to backup cell, with <1µA standby draw. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing deterministic memory state preservation during power transitions.

POS Terminal Power Management

Industrial PLC Memory Protection

Use Scenario: Battery-backed receipt printer and cash drawer controller loses main AC power during transaction.

IC Role / Device Role / Timing Role: MAX6368LKA46+T monitors 5V rail and asserts RESET to halt µP execution, gates CE to freeze SRAM, and switches OUT to backup battery within 20µs of V_CC drop.

Use Value: Prevents partial transaction commits and preserves volatile sales data in 32KB SRAM for recovery after power restoration.

Use Scenario: Programmable logic controller operating in factory environment experiences 100ms brownout on 24VDC-to-5V conversion.

IC Role / Device Role / Timing Role: MAX6368LKA46+T detects 5V sag below 4.63V, holds I/O state via CE gating, and maintains real-time clock and configuration registers using BATT.

Use Value: Eliminates need for external supercapacitor or backup regulator, reducing board space by 35% versus discrete solution.

Set-Top Box Firmware Recovery

Medical Infusion Pump Safety Monitor

Use Scenario: Cable set-top box suffers intermittent 5V supply dropout during firmware update over DOCSIS channel.

IC Role / Device Role / Timing Role: MAX6368LKA46+T uses RESET IN pin to monitor 3.3V analog tuner supply (programmed to 3.08V threshold), triggering full reset if tuner fails independently of main 5V rail.

Use Value: Enables dual-rail fault detection, preventing corrupted firmware writes and enabling safe rollback to last known good image.

Use Scenario: Portable infusion pump relies on coin-cell backup to retain dose history and calibration constants during battery replacement.

IC Role / Device Role / Timing Role: MAX6368LKA46+T provides 150ms reset hold and CE gating while switching OUT from depleted main battery to backup cell, with <1µA standby draw.

Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing deterministic memory state preservation during power transitions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6368PKA46+T	Same core functionality but push-pull active-high RESET output instead of open-drain	Requires no external pull-up resistor; incompatible with wired-OR reset buses	Select when driving single µP reset pin directly and minimizing external components
TPS3808G33DBVR	3.3V fixed reset threshold, no RESET IN pin, 360ms timeout, 2.5µA quiescent current	Lacks auxiliary reset input and battery switchover; suited for simpler 3.3V-only systems	Select when secondary supply monitoring and backup power management are unnecessary

Compared with MAX6368PKA46+T and TPS3808G33DBVR, the MAX6368LKA46+T uniquely combines open-drain RESET flexibility, 4.63V precision primary threshold, and dedicated RESET IN for dual-rail monitoring - making it optimal for complex embedded systems requiring both robust power fail response and configurable fault detection.

Availability

MAX6368LKA46+T is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, POS terminals, and set-top boxes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6368LKA46+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6365–MAX6368 family was engineered specifically for µP system supervision with integrated battery backup, chip-enable gating, and multi-threshold monitoring - targeting space-constrained, battery-sensitive embedded devices.

FAQ

What is the exact reset threshold voltage for MAX6368LKA46+T?

The MAX6368LKA46+T has a factory-trimmed V_CC reset threshold of 4.63V (typical), with guaranteed range 4.50V to 4.75V over -40°C to +85°C. This value is laser-trimmed during production and specified in the Reset Threshold Ranges table. The MAX6368LKA46+T also features a separate 1.235V (±50mV) internal reference for the RESET IN pin, enabling precise secondary supply monitoring.

How does the RESET IN pin function on MAX6368LKA46+T?

The RESET IN pin on MAX6368LKA46+T compares an external voltage against an internal 1.235V reference. When the voltage at RESET IN falls below this threshold, the device asserts RESET after a 1.5µs propagation delay. It remains asserted as long as RESET IN stays low and for at least 150ms after RESET IN rises above threshold. This allows the MAX6368LKA46+T to monitor secondary supplies like 3.3V or 2.5V rails using a simple resistor divider.

What package type and dimensions does MAX6368LKA46+T use?

The MAX6368LKA46+T is supplied in an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm with standard gull-wing leads. It is RoHS-compliant and lead(Pb)-free, marked "AACJ" on top per Maxim's Device Marking Codes table. The package supports reflow soldering at +260°C peak temperature and is rated for operation from -40°C to +85°C ambient.

Can MAX6368LKA46+T operate with V_CC below 2.0V?

Yes, the MAX6368LKA46+T is fully specified to operate with V_CC as low as 1.2V. Its internal circuitry, including the 4.63V reset comparator, RESET IN comparator, and CE gating logic, remains functional and guaranteed down to this voltage. RESET and CE OUT outputs remain valid, and the 150ms reset timeout period is maintained - enabling use in ultra-low-voltage battery-powered systems where main supply may sag to 1.8V or lower.

Does MAX6368LKA46+T support battery switchover with automatic hysteresis?

Yes, the MAX6368LKA46+T implements automatic battery switchover with 40mV hysteresis: OUT switches from V_CC to BATT when V_CC falls 20mV below VBATT, and switches back to V_CC when V_CC rises 20mV above VBATT. This prevents oscillation during slow V_CC ramps and ensures clean power transfer to attached SRAM or RTC. The device draws <1µA from BATT in backup mode (VBATT = 2.8V, V_CC = 0V), preserving battery life.

MAX6368LKA46+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: SOT-23-8

Packaging:

Product Status:: Active

Programmable:: Not Verified

Type:: Battery Backup Circuit

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.63V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 150ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-8

MAX6368LKA46+T FAQ

1.How can I place an order for MAX6368LKA46+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6368LKA46+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX6368LKA46+T reliable?

The price and inventory of MAX6368LKA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA46+T is usually 5 days.

3.What payment methods are accepted for MAX6368LKA46+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA46+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6368LKA46+T?

MAX6368LKA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6368LKA46+T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX6368LKA46+T?

For technical support, including MAX6368LKA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA46+T requirements.

6.How does Aetrix verify that MAX6368LKA46+T is sourced from the original manufacturer or authorized distributors?

All MAX6368LKA46+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6368LKA46+T meets industry standards.

7.What is the process for return or replacement of MAX6368LKA46+T?

All MAX6368LKA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA46+T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX6368LKA46+T part is unused and in its original packaging.

Return procedure for MAX6368LKA46+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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