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Analog Devices Inc./Maxim Integrated MAX6368LKA44
- Part No.:
- MAX6368LKA44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368LKA44.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,222
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Product details
Overview
MAX6368LKA44 from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, battery backup switchover, and chip-enable gating. It operates from 1.2V to 5.5V, features a factory-set 4.38V reset threshold (min 4.25V, max 4.50V), 150ms minimum reset timeout, and supports CMOS RAM protection in portable equipment during brownout or main supply failure.
For engineers reviewing the MAX6368LKA44 datasheet, MAX6368LKA44 pinout, MAX6368LKA44 application, or MAX6368LKA44 equivalent, this page delivers verified functional identity, precise reset threshold and timing behavior, battery-switchover hysteresis, CE gating propagation delay, and confirmed SOT23-8 package mapping - all critical for power-fail recovery and memory write protection design.
Technical Context
The MAX6368LKA44 integrates a precision voltage comparator monitoring VCC against a factory-trimmed 4.38V threshold, an independent 1.235V reference for the RESET IN pin, and a bidirectional transmission gate for CE signal gating with 1.5ns typical propagation delay. Its internal MOSFET switch enables seamless VCC-to-BATT switchover when VCC falls below both VTH and VBATT by ≥20mV, with 40mV hysteresis to prevent chatter.
RESET IN functions as a secondary undervoltage detector with ±25nA leakage, 1.5µs propagation delay from falling edge to reset assertion, and supports external resistor-divider programming of VRTH. The device guarantees RESET/RESET output validity down to 1.2V on either VCC or VBATT, and maintains <10µA quiescent current in normal operation and <3µA in battery-backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.25V (min) to 4.50V (max); ensures reliable detection of +5V rail brownout before system instability |
| RESET IN Threshold | 1.185V–1.285V; enables accurate secondary supply monitoring via external resistor divider |
| Reset Timeout Period | 150ms (min); guarantees µP initialization completes before release from reset |
| Supply Current (ICC) | 10µA–50µA; enables ultra-low-power operation in battery-backed systems |
| Battery-Backup Current (IBACK) | 3µA (max); minimizes battery drain during extended power-loss events |
| VCC-to-OUT On-Resistance | 4.6Ω (typ at 2.38V); limits voltage drop and power loss during main-supply operation |
| CE IN to CE OUT Delay | 2ns–9ns; preserves high-speed memory access timing integrity during fault conditions |
Pinout & Package
MAX6368LKA44 is housed in an 8-pin SOT23-8 package with standard pinout and exposed pad not present. Pin assignments are validated per Maxim's official datasheet (Rev 1, 6/01) and match the MAX6368 family top-view configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, RESET IN low, or brownout; requires external pull-down for active-low µP interface |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low disables write path during reset to prevent corruption |
| 3 GND | Ground reference | Common return for VCC, BATT, and logic signals; must be low-impedance for noise immunity |
| 4 RESET IN | Auxiliary reset input | Compares to 1.235V reference; falling edge below 1.235V triggers reset with 1.5µs delay |
| 5 VCC | Main supply input | 1.2V–5.5V operating range; reset asserts when VCC drops below 4.38V threshold |
| 6 OUT | Power output | Sources from VCC normally; switches to BATT during backup mode with <0.15V dropout |
| 7 BATT | Backup battery input | Accepts 2.25V–5.5V; enables switchover when VCC < VBATT −20mV and VCC < VTH |
| 8 CE OUT | Chip-enable output | Passes CE IN when reset inactive; held low for 12µs after reset assertion if CE IN was low |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESET IN comparator | 1.235V internal reference with ±25nA leakage enables programmable secondary supply monitoring without external op-amp |
| Chip-enable gating | 1.5ns propagation delay and 20Ω–100Ω on-resistance ensure glitch-free memory write blocking during power faults |
| Battery switchover hysteresis | 40mV (20mV up + 20mV down) prevents oscillation during slow VCC decay near switchover point |
| Low-voltage operation | Guaranteed function down to 1.2V on VCC or VBATT supports single-cell Li-ion and coin-cell backup systems |
| Reset timeout accuracy | 150ms minimum ensures µP reset release aligns with oscillator startup and PLL lock requirements |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retains real-time clock and sensor calibration data during AC power loss or battery swap. IC Role / Device Role / Timing Role: MAX6368LKA44 monitors main 5V rail and provides auxiliary RESET IN for 3.3V analog supply; asserts reset and gates CE to preserve SRAM contents. Use Value: Prevents data corruption during 100ms–500ms brownout events while drawing <3µA from backup cell. | Use Scenario: Remote I/O module in factory automation loses 24V DC input due to cable disconnect or fuse blow. IC Role / Device Role / Timing Role: MAX6368LKA44 detects VCC collapse, switches OUT to backup battery, and blocks CE to halt writes to configuration EEPROM. Use Value: Enables safe shutdown and state retention for >72 hours on CR2032, with no firmware intervention required. |
| Point-of-Sale Terminals | Smart Energy Meters |
Use Scenario: Retail terminal experiences brief grid dip during peak load switching, causing 5V rail sag below 4.3V. IC Role / Device Role / Timing Role: MAX6368LKA44 asserts reset within 20µs of VCC crossing 4.38V threshold and holds CE OUT low for 12µs to complete last transaction write. Use Value: Guarantees atomic transaction commit before µP reset, eliminating partial record corruption in flash storage. | Use Scenario: Meter loses mains power but must retain time-of-use billing data and tamper logs for regulatory compliance. IC Role / Device Role / Timing Role: MAX6368LKA44 uses RESET IN to monitor supercapacitor voltage; triggers backup switchover and CE gating before VCC drops below RTC operating limit. Use Value: Achieves >10-year backup lifetime using 0.1F 5.5V supercap with <3µA quiescent draw in hold mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA44 | Same 4.38V reset threshold and RESET IN functionality, but push-pull active-high RESET output instead of open-drain | Eliminates need for external pull-down resistor; unsuitable where wired-OR reset bus is used | Select when driving single µP with dedicated reset line and board space is constrained |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no RESET IN pin, 200ms reset timeout, 2.5µA ICC, SOT23-6 package | Lacks battery switchover and CE gating; only monitors primary supply | Choose for cost-sensitive, single-rail systems where auxiliary monitoring and memory protection are unnecessary |
Compared with MAX6368PKA44, the MAX6368LKA44 offers open-drain flexibility for shared reset buses; versus TPS3808G33DBVR, it adds critical battery backup, CE gating, and dual-supply monitoring - making it uniquely suited for data-retentive embedded systems requiring robust power-fail response.
Availability
MAX6368LKA44 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, point-of-sale terminals, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for MAX6368LKA44 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 connectivity in demanding environments.
The MAX6365–MAX6368 family targets microprocessor-based systems needing coordinated power monitoring, battery backup, and memory write protection - especially in space-constrained portable and industrial equipment.
FAQ
What is the exact reset threshold voltage for MAX6368LKA44?
The MAX6368LKA44 has a factory-trimmed reset threshold of 4.38V (typical), with guaranteed minimum of 4.25V and maximum of 4.50V over temperature. This value is laser-trimmed during production and applies specifically to the VCC supply monitoring function. The device does not allow user adjustment of this threshold; it is fixed per the "44" suffix in the part number.
How does the RESET IN pin function on MAX6368LKA44?
The RESET IN pin on MAX6368LKA44 compares an external voltage to an internal 1.235V reference. When the voltage at RESET IN falls below 1.235V (1.185V min, 1.285V max), the device asserts reset. Propagation delay from RESET IN falling edge to reset assertion is 1.5µs (typ). This pin enables monitoring of secondary supplies like 3.3V or 2.5V rails using a simple resistor divider.
Does MAX6368LKA44 support battery backup switchover, and what are the conditions?
Yes, MAX6368LKA44 supports automatic battery backup switchover. Switchover occurs only when two conditions are met simultaneously: VCC must be below the 4.38V reset threshold, and VCC must be at least 20mV lower than VBATT. A 40mV hysteresis (20mV up, 20mV down) prevents oscillation during slow VCC decay. The device sources power from BATT to OUT with <0.15V dropout at 5mA load.
What is the purpose of the CE IN and CE OUT pins on MAX6368LKA44?
The CE IN and CE OUT pins implement chip-enable signal gating to prevent erroneous writes to CMOS RAM during power faults. When reset is not asserted, CE IN passes directly to CE OUT with 1.5ns propagation delay. When reset asserts and CE IN is low, CE OUT is held low for 12µs to complete ongoing memory operations before isolation. This feature is integral to MAX6368LKA44's role in data-retentive systems.
What package type and pin count does MAX6368LKA44 use?
MAX6368LKA44 uses an 8-pin SOT23-8 surface-mount package with standard pinout as documented in Maxim's datasheet (Rev 1, 6/01). The package has no exposed thermal pad. Pin 1 is RESET (active-high open-drain), pin 4 is RESET IN, pin 5 is VCC, pin 6 is OUT, pin 7 is BATT, and pin 8 is CE OUT - all electrically and mechanically validated for reflow assembly.
MAX6368LKA44 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
MAX6368LKA44 FAQ
1.How can I place an order for MAX6368LKA44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368LKA44 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 MAX6368LKA44 reliable?
The price and inventory of MAX6368LKA44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA44 is usually 5 days.
3.What payment methods are accepted for MAX6368LKA44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368LKA44?
MAX6368LKA44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368LKA44 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 MAX6368LKA44?
For technical support, including MAX6368LKA44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA44 requirements.
6.How does Aetrix verify that MAX6368LKA44 is sourced from the original manufacturer or authorized distributors?
All MAX6368LKA44 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 MAX6368LKA44 meets industry standards.
7.What is the process for return or replacement of MAX6368LKA44?
All MAX6368LKA44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA44, 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 MAX6368LKA44 part is unused and in its original packaging.
Return procedure for MAX6368LKA44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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