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Analog Devices Inc./Maxim Integrated MAX6365LKA31-T
- Part No.:
- MAX6365LKA31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6365LKA31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
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Product details
Overview
MAX6365LKA31-T from Maxim Integrated is a low-power microprocessor supervisory circuit with manual reset input, battery-backup switchover, and chip-enable gating. It monitors VCC supply (1.2V–5.5V), asserts active-low open-drain RESET when VCC falls below 3.08V (typ), provides 150ms min reset timeout, consumes only 10µA quiescent current, and operates in -40°C to +85°C for use in portable equipment requiring reliable power-up/down and brownout protection.
For engineers reviewing the MAX6365LKA31-T datasheet, MAX6365LKA31-T pinout, MAX6365LKA31-T application, or MAX6365LKA31-T equivalent, key selection criteria include factory-trimmed 3.08V reset threshold, SOT23-8 package compatibility, manual reset debouncing capability, guaranteed RESET assertion down to 1.2V VCC/VBATT, and integrated CE signal gating with 1.5ns propagation delay.
Technical Context
The MAX6365LKA31-T implements a precision voltage monitor with ±1.5% threshold accuracy over temperature, internal 20kΩ MR pullup, and glitch-immune manual reset input. Its battery switchover logic activates when VCC drops below both the 3.08V threshold and VBATT by ≥20mV, switching OUT from VCC to BATT with hysteresis to prevent oscillation.
Chip-enable gating uses a transmission gate between CE IN and CE OUT, enabling pass-through during normal operation and forcing CE OUT low for 12µs upon reset assertion if CE IN is low-ensuring SRAM write protection during power faults without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (min/typ/max); factory-trimmed for precise +3.3V rail monitoring |
| Reset Timeout Period | 150ms minimum; ensures µP initialization completes before release |
| Supply Current | 10µA typical at VCC = 5.5V; enables multi-year battery life in backup mode |
| Operating Voltage | 1.2V to 5.5V on VCC/VBATT; supports single-cell Li-ion and legacy 3.3V/5V systems |
| CE Propagation Delay | 1.5ns typical; preserves timing integrity for high-speed µP address/data buses |
| MR Input Pullup | 20kΩ internal; eliminates external resistor for momentary switch interface |
| RESET Output Type | Open-drain active-low; allows wired-OR configuration and flexible voltage-level translation |
Pinout & Package
MAX6365LKA31-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs. Pin assignments are validated per Maxim's official pin configuration diagram for MAX6365.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, MR low, or brownout; requires external pullup |
| 2: CE IN | Chip-enable input | Controls gating of CE signal to SRAM; connect to GND or OUT if unused |
| 3: GND | Ground reference | Common return path for all analog/digital functions and reset timing |
| 4: MR | Manual reset input | Debounced logic input with 20kΩ internal pullup; low pulse initiates reset |
| 5: VCC | Main supply input | Primary power source (1.2V–5.5V); powers device and supplies OUT during normal operation |
| 6: OUT | Regulated output | Sources from VCC normally; switches to BATT during backup mode with <4.6Ω on-resistance |
| 7: BATT | Battery backup input | Backup source (≥2.25V); automatically engages when VCC < VTH and VCC < VBATT – 20mV |
| 8: CE OUT | Chip-enable output | Gated CE signal to SRAM; held low for 12µs after reset assertion if CE IN is low |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V (typ) with ±1.5% accuracy over -40°C to +85°C enables precise +3.3V rail supervision |
| Integrated manual reset debouncing | Internal 20kΩ pullup and noise immunity eliminate need for external RC filter or Schmitt trigger |
| Battery switchover hysteresis | 40mV (20mV up/down) prevents oscillation during slow VCC ramp-down or noisy backup transitions |
| Chip-enable gating propagation delay | 1.5ns typical ensures compatibility with >500MHz µP address buses without timing violation |
| Ultra-low backup-mode current | 3µA max IBACK at -40°C to +85°C extends coin-cell lifetime to >10 years in always-on SRAM retention |
Applications
| Portable Medical Monitors | Fax Machines |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retaining real-time clock and calibration data during main power loss. IC Role / Device Role / Timing Role: Supervises 3.3V system rail, switches SRAM to coin-cell backup, gates CE to prevent corrupted memory writes during brownout. Use Value: Guarantees 150ms reset hold time and <1.5ns CE delay to maintain data integrity across power transitions without firmware intervention. | Use Scenario: Fax machine preserving dialing history and settings during AC power interruption or battery replacement. IC Role / Device Role / Timing Role: Monitors 5V logic supply, asserts RESET to halt CPU during undervoltage, enables manual reset via front-panel button. Use Value: Internal MR pullup and debounced input allow direct switch connection-no external components required for field-serviceable reset. |
| Industrial POS Terminals | Set-Top Boxes |
Use Scenario: Retail terminal maintaining transaction logs and secure keys in nonvolatile SRAM during unexpected power failure. IC Role / Device Role / Timing Role: Provides VCC monitoring, battery-backed SRAM power, and CE gating to block write cycles during reset assertion. Use Value: 3µA backup current and 4.6Ω BATT-to-OUT on-resistance ensure >5-year coin-cell life while supporting 150mA peak SRAM load. | Use Scenario: Consumer STB retaining channel lineup and parental controls after brief AC dropout or standby mode entry. IC Role / Device Role / Timing Role: Supervises 3.3V SoC supply, generates clean reset pulse, and isolates memory bus using CE gating during power recovery. Use Value: 1.2V minimum operating voltage allows operation during deep brownout conditions where other supervisors fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6365PKA31-T | Same 3.08V threshold and SOT23-8 package, but push-pull RESET output instead of open-drain | Requires no external pullup resistor; unsuitable for wired-OR reset busing | Select when board-level reset net uses single-source drive and PCB layout prohibits pullup placement |
| TPS3808G33DBVR | 3.3V fixed threshold, 350ms reset timeout, 2.9µA IQ, SOT23-6 package, no CE gating or battery switchover | Lacks battery backup, chip-enable control, and manual reset-only basic VCC supervision | Select when system uses separate backup controller and only requires simple reset generation for +3.3V rails |
Compared with MAX6365PKA31-T, the MAX6365LKA31-T offers open-drain flexibility for multi-source reset nets, while TPS3808G33DBVR reduces footprint and quiescent current but sacrifices battery switchover, CE gating, and MR functionality essential for SRAM-retention systems.
Availability
MAX6365LKA31-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial POS terminals, fax machines, and set-top boxes requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for MAX6365LKA31-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, sensing, and interface applications in industrial, automotive, and consumer systems.
The MAX6365–MAX6368 family delivers integrated µP supervision with battery backup and memory write protection, targeting space- and power-constrained embedded systems needing reliable power-fail response without external discrete components.
FAQ
What is the exact reset threshold voltage for MAX6365LKA31-T?
The MAX6365LKA31-T has a factory-trimmed reset threshold of 3.00V (min), 3.08V (typ), and 3.15V (max) over the full -40°C to +85°C temperature range. This 3.08V typical value is specifically calibrated for accurate supervision of +3.3V power rails, with ±1.5% tolerance ensuring robust operation under voltage drift and thermal variation. The MAX6365LKA31-T datasheet confirms this threshold is laser-trimmed during production and does not require external adjustment.
Does MAX6365LKA31-T support battery backup functionality, and how does it switch?
Yes, MAX6365LKA31-T fully supports battery backup. It switches OUT from VCC to BATT when two conditions are met: VCC falls below the 3.08V reset threshold and VCC is at least 20mV lower than VBATT. A 40mV hysteresis (20mV up/down) prevents oscillation during slow VCC decay. In backup mode, MAX6365LKA31-T draws only 3µA from the battery while delivering up to 150mA to SRAM via the BATT-to-OUT path, with on-resistance as low as 4.6Ω at 2.3V VBATT.
What is the function of the MR pin on MAX6365LKA31-T, and does it require external components?
The MR (Manual Reset) pin on MAX6365LKA31-T is a debounced, active-low input that asserts RESET when pulled low. It features an internal 20kΩ pullup resistor to VCC, eliminating the need for external pullup components. A momentary switch from MR to GND provides full manual reset functionality-no external RC filter or Schmitt trigger is required. The MAX6365LKA31-T datasheet specifies 1µs minimum MR pulse width and 100ns glitch immunity, making it robust against contact bounce and EMI in handheld devices.
How does the chip-enable (CE) gating work on MAX6365LKA31-T, and what is its timing behavior?
MAX6365LKA31-T gates the CE signal between CE IN and CE OUT using a low-on-resistance transmission gate. During normal operation, CE IN passes directly to CE OUT with 1.5ns typical propagation delay. When RESET asserts and CE IN is low, CE OUT is held low for 12µs (typ) to complete ongoing memory access; thereafter, CE OUT is actively pulled up to OUT. If CE IN is high during reset, CE OUT remains high. This behavior prevents partial writes to SRAM during power faults, and the MAX6365LKA31-T specification guarantees CE IN leakage <1µA and on-resistance 20–100Ω.
Is MAX6365LKA31-T compatible with 1.2V logic systems, and what is its minimum operating voltage?
Yes, MAX6365LKA31-T is fully compatible with 1.2V logic systems. Its absolute minimum operating voltage is 1.2V on both VCC and VBATT inputs, with RESET and CE outputs guaranteed functional down to 1.2V. The device draws only 10µA typical supply current at 5.5V and maintains 150ms reset timeout and 3.08V threshold accuracy across the entire 1.2V–5.5V range. This enables use in ultra-low-voltage applications such as energy-harvesting sensors or single-cell LiFePO₄ powered devices where other supervisors fail to operate.
MAX6365LKA31-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:
- 3.08V
- 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
MAX6365LKA31-T FAQ
1.How can I place an order for MAX6365LKA31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6365LKA31-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 MAX6365LKA31-T reliable?
The price and inventory of MAX6365LKA31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6365LKA31-T is usually 5 days.
3.What payment methods are accepted for MAX6365LKA31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6365LKA31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6365LKA31-T?
MAX6365LKA31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6365LKA31-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 MAX6365LKA31-T?
For technical support, including MAX6365LKA31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6365LKA31-T requirements.
6.How does Aetrix verify that MAX6365LKA31-T is sourced from the original manufacturer or authorized distributors?
All MAX6365LKA31-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 MAX6365LKA31-T meets industry standards.
7.What is the process for return or replacement of MAX6365LKA31-T?
All MAX6365LKA31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6365LKA31-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 MAX6365LKA31-T part is unused and in its original packaging.
Return procedure for MAX6365LKA31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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