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Analog Devices Inc./Maxim Integrated MAX6365LKA44-T
- Part No.:
- MAX6365LKA44-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6365LKA44-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
MAX6365LKA44-T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup switching, chip-enable gating, and factory-preset 4.38V reset threshold. It provides active-low open-drain RESET output, monitors VCC down to 1.2V, delivers ≤10µA quiescent current, and supports CMOS RAM write protection in brownout conditions-used in portable POS terminals and industrial controllers requiring reliable power-fail response.
For engineers reviewing the MAX6365LKA44-T datasheet, MAX6365LKA44-T pinout, MAX6365LKA44-T application, or MAX6365LKA44-T equivalent, key selection criteria include its 4.38V reset threshold accuracy, 150ms minimum reset timeout, SOT23-8 package compatibility, and integrated CE gating with 1.5ns propagation delay for SRAM protection.
Technical Context
The MAX6365LKA44-T implements a precision voltage monitor with ±1.5% threshold tolerance over temperature, internal 20kΩ MR pullup, and dual-path power routing: VCC powers OUT during normal operation, while BATT supplies OUT when VCC drops below 4.38V and VBATT exceeds VCC by ≥20mV. Its chip-enable gating uses a transmission gate with 20–100Ω on-resistance and 12µs reset-to-CE OUT delay.
It features debounced manual reset input (MR), guaranteed RESET assertion down to 1.2V VCC or VBATT, and transient immunity validated up to 30µs at 100mV overdrive-enabling robust operation in noisy industrial environments without external RC filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (factory preset, ±1.5% over -40°C to +85°C) - ensures reliable detection of 3.3V/5V supply brownout |
| Reset Timeout Period | 150ms min - guarantees µP initialization completes before release |
| Supply Current | 10µA max at VCC = 5.5V - enables multi-year battery backup in portable systems |
| Operating Voltage | 1.2V to 5.5V - supports direct interface with 1.2V logic and legacy 5V rails |
| CE Propagation Delay | 1.5ns - preserves timing integrity for high-speed µP address/data buses |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration with other supervisors |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC ramp-down |
Pinout & Package
MAX6365LKA44-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in handheld and embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC < 4.38V, MR low, or power failure; requires external pullup for logic-level compatibility |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low disables write path during reset to prevent data corruption |
| 3 GND | Ground reference | Common return for VCC, BATT, and digital logic; must be low-impedance for noise immunity |
| 4 MR | Manual reset input | Logic-low assertion triggers reset; internal 20kΩ pullup to VCC eliminates need for external resistor |
| 5 VCC | Main supply input | Powers device and sources OUT during normal operation; monitored for reset generation |
| 6 OUT | Power output | Switches between VCC and BATT based on voltage comparison; delivers up to 150mA to SRAM |
| 7 BATT | Backup battery input | Provides hold-up power when VCC fails; requires ≥20mV above VCC to engage switchover |
| 8 CE OUT | Chip-enable output | Passes CE IN when reset inactive; held low for 12µs after reset assertion to complete ongoing memory access |
Key Features
| Feature | Design Value |
|---|---|
| On-board CE gating | 1.5ns propagation delay and 20–100Ω on-resistance enable glitch-free SRAM write blocking during power faults |
| Debounced MR input | Internal 20kΩ pullup and noise-immune design eliminate external debounce components in pushbutton reset circuits |
| Battery switchover control | Automatic VCC/BATT selection with 40mV hysteresis ensures stable RAM power during brownout without oscillation |
| Low 10µA supply current | Extends backup battery life to >5 years in always-on monitoring applications using standard coin cells |
| 1.2V operation guarantee | RESET remains valid even as VCC or VBATT decays to 1.2V - critical for graceful shutdown in ultra-low-voltage systems |
Applications
| POS Terminal Power Management | Industrial PLC Memory Protection |
|---|---|
Use Scenario: Battery-backed point-of-sale terminal maintaining transaction log during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET and switching SRAM to backup battery within 20µs of VCC drop below 4.38V. Use Value: Prevents partial transaction writes and ensures EEPROM/SRAM integrity across 100+ ms brownout events. | Use Scenario: Programmable logic controller preserving I/O state and program counters during factory floor power dips. IC Role / Device Role / Timing Role: Monitoring 5V system rail and disabling memory writes via CE gating while holding µP in reset for 150ms. Use Value: Eliminates firmware corruption risk without requiring external watchdog or FPGA-based supervision logic. |
| Portable Medical Monitor Data Retention | Set-Top Box Firmware Recovery |
Use Scenario: Handheld ECG monitor retaining real-time waveform buffers during battery swap. IC Role / Device Role / Timing Role: Seamlessly transferring SRAM power from main Li-ion to backup coin cell with <40mV switchover hysteresis. Use Value: Enables hot-swap capability with zero data loss and no software intervention required. | Use Scenario: Consumer set-top box recovering from corrupted firmware after unexpected power cycle. IC Role / Device Role / Timing Role: Holding ARM processor in reset until 5V rail stabilizes above 4.38V and enabling boot ROM access via CE gating. Use Value: Guarantees safe reinitialization sequence and prevents execution of invalid code from partially written flash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6365PKA44-T | Same 4.38V threshold and SOT23-8 package, but push-pull active-low RESET output instead of open-drain | Requires no external pullup resistor; incompatible with wired-OR reset bus configurations | Select when driving single-load RESET lines without shared bus requirements |
| TPS3808G33DBVR | 3.3V fixed threshold, 350ms timeout, 2.5µA quiescent current, SOT23-6 package | Lacks battery switchover, CE gating, and manual reset - limited to basic power monitoring | Select only for cost-sensitive, non-battery-backed applications where 4.38V threshold is not required |
Compared with MAX6365PKA44-T and TPS3808G33DBVR, the MAX6365LKA44-T uniquely combines 4.38V precision reset, open-drain flexibility, integrated battery switchover, and CE gating-making it irreplaceable in designs requiring SRAM data retention during power failure.
Availability
MAX6365LKA44-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical monitors, POS terminals, and set-top boxes requiring stable component supply with long-term lifecycle support.
Supply support for MAX6365LKA44-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 connectivity in demanding industrial and embedded systems.
The MAX6365–MAX6368 family was engineered specifically for µP-based systems needing coordinated power monitoring, battery backup, and memory write protection - targeting applications where data integrity during power transitions is non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6365LKA44-T?
The MAX6365LKA44-T has a factory-preset reset threshold of 4.38V (typical), with guaranteed range of 4.25V to 4.50V over -40°C to +85°C. This value is laser-trimmed during production and does not require external resistor programming - ensuring consistent 3.3V/5V supply monitoring without calibration.
Does the MAX6365LKA44-T support battery backup functionality?
Yes, the MAX6365LKA44-T fully supports battery backup: when VCC falls below 4.38V and VBATT exceeds VCC by ≥20mV, it automatically switches OUT from VCC to BATT. The internal MOSFET provides ≤4.6Ω on-resistance at 2.38V VCC, enabling up to 150mA SRAM hold-up current with minimal voltage drop.
What is the function of the CE IN and CE OUT pins on the MAX6365LKA44-T?
The CE IN and CE OUT pins implement hardware-enforced chip-enable gating: during normal operation, CE IN passes directly to CE OUT with 1.5ns delay; when RESET asserts, CE OUT is disabled to block memory writes. If CE IN is low at reset onset, CE OUT stays low for 12µs to complete pending SRAM access - preventing data corruption during power faults.
Can the MAX6365LKA44-T operate with a 1.2V supply voltage?
Yes, the MAX6365LKA44-T operates down to 1.2V on both VCC and VBATT inputs, and its RESET output remains valid (guaranteed logic level) at this voltage. This enables use in ultra-low-power systems such as energy-harvesting sensors or deep-sleep microcontrollers where supply rails decay below 1.8V.
Is the MR pin on the MAX6365LKA44-T internally pulled up?
Yes, the MR pin on the MAX6365LKA44-T includes an internal 20kΩ pullup resistor to VCC, eliminating the need for an external pullup. A momentary switch from MR to GND generates a clean reset pulse, and the internal debounce ensures immunity to contact bounce - simplifying front-panel reset implementation.
MAX6365LKA44-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
MAX6365LKA44-T FAQ
1.How can I place an order for MAX6365LKA44-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6365LKA44-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 MAX6365LKA44-T reliable?
The price and inventory of MAX6365LKA44-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6365LKA44-T is usually 5 days.
3.What payment methods are accepted for MAX6365LKA44-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6365LKA44-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6365LKA44-T?
MAX6365LKA44-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6365LKA44-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 MAX6365LKA44-T?
For technical support, including MAX6365LKA44-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6365LKA44-T requirements.
6.How does Aetrix verify that MAX6365LKA44-T is sourced from the original manufacturer or authorized distributors?
All MAX6365LKA44-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 MAX6365LKA44-T meets industry standards.
7.What is the process for return or replacement of MAX6365LKA44-T?
All MAX6365LKA44-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6365LKA44-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 MAX6365LKA44-T part is unused and in its original packaging.
Return procedure for MAX6365LKA44-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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