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Analog Devices Inc./Maxim Integrated MAX6365LKA23-T
- Part No.:
- MAX6365LKA23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6365LKA23-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
The MAX6365LKA23-T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup switching, chip-enable gating, and debounced manual reset input. It operates from 1.2V to 5.5V, features a factory-preset 2.32V reset threshold, guarantees RESET assertion down to 1.2V, delivers 150ms minimum reset timeout, and supports CMOS RAM write protection in portable medical monitors and industrial controllers.
For engineers reviewing the MAX6365LKA23-T datasheet, MAX6365LKA23-T pinout, MAX6365LKA23-T application, or MAX6365LKA23-T equivalent, key selection criteria include its SOT23-8 package, active-low open-drain RESET output, 10µA quiescent current, VCC-to-BATT switchover hysteresis, and CE IN/CE OUT propagation delay under 9ns - all critical for reliable power-fail response in space-constrained embedded systems.
Technical Context
This device integrates four core functions: (1) power-on/power-down/brownout reset generation with 20µs VCC-falling delay; (2) automatic VCC-to-battery switchover when VCC drops below both reset threshold and VBATT by ≥20mV; (3) chip-enable signal gating with 1.5ns propagation delay and 20–100Ω on-resistance; and (4) debounced manual reset input with 20kΩ internal pullup and 120ns MR-to-RESET delay.
It uses an internal MOSFET for battery switchover, maintains CE OUT high during reset if CE IN was high, holds CE OUT low for 12µs if CE IN was low at reset assertion, and guarantees RESET/RESET validity down to 1.2V supply - enabling operation across full battery discharge profiles in handheld instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (factory preset, ±70mV over temperature) - ensures reliable detection of 2.5V rail brownout before system instability. |
| Quiescent Current | 10µA (typ) at VCC = 5.5V - enables multi-year battery life in always-on backup mode. |
| Reset Timeout | 150ms min - satisfies µP power-up timing requirements for most ARM Cortex-M and PIC microcontrollers. |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with Li-ion, coin-cell, and regulated 3.3V/5V supplies without external level shifting. |
| Battery Switchover Hysteresis | 40mV (20mV up + 20mV down) - prevents oscillation during slow VCC decay near threshold. |
| CE Propagation Delay | 2ns to 9ns (50Ω source, 50pF load) - preserves timing integrity for SRAM access in ≤20MHz bus systems. |
| Supply Transient Immunity | Withstands 30µs transients 100mV below VTH - reduces false resets in electrically noisy industrial environments. |
Pinout & Package
MAX6365LKA23-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for PCB area-constrained applications including portable diagnostics and smart sensors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, MR low, or reset timeout; requires external pullup for logic-level compatibility. |
| 2 CE IN | Chip-enable input | Controls gating path to CE OUT; tied to GND or OUT if unused; 1µA leakage ensures low standby power. |
| 3 GND | Ground reference | Primary return path for VCC, BATT, and CE circuits; must be low-impedance for noise immunity. |
| 4 MR | Manual reset input | Debounced logic input with 20kΩ internal pullup; asserts reset when pulled low; no external RC needed. |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation. |
| 6 OUT | Power output | Sources from VCC normally; switches to BATT during brownout; delivers up to 150mA with <4.6Ω on-resistance. |
| 7 BATT | Battery backup input | Accepts 0V–6V; activates switchover when VCC < VTH and VCC < (VBATT − 20mV); draws <1µA in standby. |
| 8 CE OUT | Chip-enable output | Gated version of CE IN; disabled during reset to prevent SRAM corruption; actively pulled to OUT when isolated. |
Key Features
| Feature | Design Value |
|---|---|
| On-board CE gating | 1.5ns propagation delay and <100Ω on-resistance enable direct integration with high-speed µP address/data buses without timing penalties. |
| Debounced MR input | Internal 20kΩ pullup and 120ns delay eliminate need for external RC debounce, reducing BOM count and PCB footprint. |
| VCC-to-BATT switchover | Automatic MOSFET-controlled transition with 40mV hysteresis ensures glitch-free RAM retention during mains failure or battery swap. |
| 1.2V guaranteed operation | RESET/RESET remains valid down to 1.2V supply - supports deep battery discharge monitoring in coin-cell-powered IoT nodes. |
| Low 10µA supply current | Enables >10-year shelf life in battery-backed memory retention applications using CR2032 cells (220mAh). |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous ECG waveform logging during AC power interruption in handheld patient monitors. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed SRAM retention, and CE gating to freeze memory writes during power transition. Use Value: Prevents data corruption and ensures deterministic restart after 100ms line dip - meeting IEC 60601-1 immunity requirements. | Use Scenario: Maintaining configuration EEPROM and real-time clock state during 24VDC supply sag in factory automation controllers. IC Role / Device Role / Timing Role: Power supervisor asserting reset and enabling battery switchover while disabling CE to protect nonvolatile memory. Use Value: Guarantees 150ms reset hold time and <1µA backup current - eliminating firmware rollback and clock drift during 500ms brownouts. |
| Smart Utility Meters | POS Terminal Battery Backup |
Use Scenario: Preserving tamper logs and billing data during lithium-thionyl chloride cell replacement in AMI meters. IC Role / Device Role / Timing Role: Supervisor managing VCC/BATT handoff, generating reset pulse, and gating CE to lock SRAM during hot-swap. Use Value: 40mV switchover hysteresis prevents chatter during cell insertion; 10µA IBACK extends 20-year meter lifetime. | Use Scenario: Securing transaction buffers and cryptographic keys during brief AC outage in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Reset generator and CE gate preventing partial write cycles to flash memory during power collapse. Use Value: 150ms tRP exceeds PCIe/NVMe controller reset requirements; 2ns CE delay ensures compatibility with 100MHz SPI interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6365PKA23-T | Same reset threshold (2.32V) and functionality, but push-pull active-low RESET output instead of open-drain active-high. | Requires no external pullup resistor; better suited for systems needing direct drive of µP reset pins without level translation. | Select when interfacing with legacy microcontrollers that require active-low push-pull reset signals and lack internal pullups. |
| TPS3808G125DBVR | Lower quiescent current (1.1µA), fixed 1.25V threshold, no battery switchover or CE gating; SOT23-6 package. | Only provides basic reset supervision - lacks backup power management and memory write protection features. | Choose only for simple reset-only applications where battery backup and CE control are unnecessary and ultra-low IBACK is critical. |
Compared with MAX6365PKA23-T and TPS3808G125DBVR, the MAX6365LKA23-T uniquely combines open-drain active-high reset, integrated battery switchover, and chip-enable gating in a single SOT23-8 package - making it the only option for space-limited designs requiring coordinated power fail response and SRAM write protection.
Availability
MAX6365LKA23-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart utility meters, and POS terminal battery backup systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6365LKA23-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 medical applications.
The MAX6365–MAX6368 family targets compact, battery-sensitive µP systems requiring coordinated reset, backup power switchover, and memory write protection - especially where PCB area and standby current are critical constraints.
FAQ
What is the reset output type of the MAX6365LKA23-T?
The MAX6365LKA23-T features an active-high open-drain RESET output (Pin 1). This requires an external pullup resistor to define the inactive-state voltage level. The output asserts high during VCC undervoltage, manual reset activation, or brownout conditions, and remains asserted for a minimum of 150ms after VCC recovers above the 2.32V threshold. Its open-drain structure allows wired-OR configurations and voltage-level flexibility across mixed-supply systems.
How does the MAX6365LKA23-T handle battery switchover during power failure?
The MAX6365LKA23-T automatically switches OUT from VCC to BATT when two conditions are met: VCC falls below the 2.32V reset threshold and VCC drops at least 20mV below VBATT. A 40mV total hysteresis (20mV up, 20mV down) prevents oscillation during slow VCC decay. In battery-backup mode, OUT is sourced from BATT with <4.6Ω on-resistance, delivering up to 20mA while drawing <1µA from the battery when idle - ensuring multi-year retention in coin-cell applications.
What is the function of the CE IN and CE OUT pins on the MAX6365LKA23-T?
CE IN (Pin 2) and CE OUT (Pin 8) implement chip-enable signal gating to prevent SRAM corruption during power faults. During normal operation, CE IN passes directly to CE OUT with 1.5ns propagation delay and 20–100Ω on-resistance. When reset asserts, CE OUT is disabled: if CE IN was high, CE OUT stays high; if CE IN was low, CE OUT is held low for 12µs then actively pulled to OUT. This ensures memory write cycles complete before isolation - a critical feature for reliable data logging in medical and industrial devices using the MAX6365LKA23-T.
Can the MAX6365LKA23-T operate with a 1.8V main supply?
Yes, the MAX6365LKA23-T fully supports 1.8V VCC operation. Its 1.2V to 5.5V operating range, 10µA typical supply current at 1.8V, and guaranteed RESET/RESET validity down to 1.2V make it compatible with modern low-voltage microcontrollers and FPGAs. At 1.8V, the device maintains 2.32V reset detection accuracy (±70mV), 150ms timeout, and sub-9ns CE propagation delay - enabling robust supervision in energy-harvesting and battery-powered edge nodes where the MAX6365LKA23-T serves as the primary power integrity guardian.
What is the purpose of the MR pin on the MAX6365LKA23-T?
The MR (Manual Reset) pin (Pin 4) provides user-initiated system reset capability. A logic-low signal on MR asserts the RESET output immediately and holds it active for the full 150ms timeout period after MR returns high. The MAX6365LKA23-T includes a 20kΩ internal pullup resistor to VCC, eliminating external components. MR accepts TTL/CMOS logic levels and is debounced internally - allowing direct connection to momentary switches or GPIOs without RC networks. This simplifies front-panel reset design in field-deployable equipment using the MAX6365LKA23-T.
MAX6365LKA23-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:
- 2.32V
- 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
MAX6365LKA23-T FAQ
1.How can I place an order for MAX6365LKA23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6365LKA23-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 MAX6365LKA23-T reliable?
The price and inventory of MAX6365LKA23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6365LKA23-T is usually 5 days.
3.What payment methods are accepted for MAX6365LKA23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6365LKA23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6365LKA23-T?
MAX6365LKA23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6365LKA23-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 MAX6365LKA23-T?
For technical support, including MAX6365LKA23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6365LKA23-T requirements.
6.How does Aetrix verify that MAX6365LKA23-T is sourced from the original manufacturer or authorized distributors?
All MAX6365LKA23-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 MAX6365LKA23-T meets industry standards.
7.What is the process for return or replacement of MAX6365LKA23-T?
All MAX6365LKA23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6365LKA23-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 MAX6365LKA23-T part is unused and in its original packaging.
Return procedure for MAX6365LKA23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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