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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:1,120
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Product details
Overview
The 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-preset 4.38V reset threshold (±0.13V), 150ms minimum reset timeout, 10µA quiescent current, and delivers up to 150mA from VCC or battery. It is used in portable equipment requiring reliable power monitoring and nonvolatile memory protection during brownout.
For engineers reviewing the MAX6368LKA44+ datasheet, MAX6368LKA44+ pinout, MAX6368LKA44+ application, or MAX6368LKA44+ equivalent, key selection criteria include its 4.38V reset threshold, RESET IN comparator with 1.235V internal reference, open-drain active-low reset output, SOT23-8 package, and support for battery-backed CMOS RAM write protection in industrial and portable systems.
Technical Context
The MAX6368LKA44+ integrates a precision voltage monitor, a dedicated RESET IN comparator referenced to 1.235V, and a bidirectional VCC/BATT switchover MOSFET with 40mV hysteresis. Its chip-enable gating path uses a transmission gate with 2ns typical propagation delay and 20–100Ω on-resistance when enabled.
It asserts reset continuously when VCC falls below 4.38V, when RESET IN drops below 1.235V, or during power-up/down; reset remains asserted for ≥150ms after recovery. The device guarantees RESET/RESET validity down to 1.2V supply and supports CE IN-to-CE OUT control independent of reset state, enabling safe SRAM access during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (typ), ±0.13V over temperature - sets precise brownout detection point for +5V or +3.3V rails |
| RESET IN Threshold | 1.235V (typ), ±50mV - enables external undervoltage monitoring of secondary supplies via resistor divider |
| Reset Timeout Period | 150ms (min) - ensures µP completes full reset initialization before code execution resumes |
| Quiescent Supply Current | 10µA (typ) at VCC = 5.5V - minimizes standby power in battery-critical applications |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and enables use with Li-ion or coin-cell backup |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC decay near VBATT crossover |
| CE IN to CE OUT Delay | 2ns (typ) at 50Ω source / 50pF load - preserves timing integrity for high-speed µP address/data buses |
Pinout & Package
MAX6368LKA44+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead(Pb)-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC < 4.38V, RESET IN < 1.235V, or power-up; requires external pullup for logic-high state |
| 2 CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write path during reset or fault |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection |
| 4 RESET IN | Auxiliary reset input | Comparator input referenced to 1.235V; falling edge below threshold triggers reset assertion |
| 5 VCC | Main supply input | Primary power source (1.2V–5.5V); powers internal circuitry and sources OUT during normal operation |
| 6 OUT | Output supply rail | Switches between VCC and BATT based on voltage comparison; powers SRAM or real-time clock |
| 7 BATT | Backup battery input | Provides backup power when VCC drops; must exceed VCC by >20mV to engage switchover |
| 8 CE OUT | Chip-enable output | Gated version of CE IN; goes low only when CE IN is low and reset is not asserted |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable RESET IN | Internal 1.235V reference enables programmable undervoltage detection of secondary supplies (e.g., 4.60V via R1/R2 divider) |
| Battery-backed SRAM protection | VCC/BATT switchover with 40mV hysteresis and <1µA battery standby current preserves data during extended outages |
| Chip-enable gating | 2ns propagation delay and <100Ω on-resistance allow safe, high-speed CE control without bus contention |
| Low-voltage operation | Guaranteed function down to 1.2V VCC or VBATT ensures robustness during deep brownout and cold-start conditions |
| Power-supply transient immunity | Withstands negative-going VCC transients up to 30µs at 100mV overdrive without false reset assertion |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retaining real-time sensor data and configuration during AC loss or battery swap. IC Role / Device Role / Timing Role: Supervisory controller providing VCC brownout detection, automatic BATT switchover to SRAM, and RESET IN monitoring of analog front-end supply. Use Value: Prevents data corruption during 100ms–2s power gaps using <1µA battery drain and 150ms guaranteed reset hold time. | Use Scenario: Distributed I/O node in factory automation maintaining register state and communication buffers during 24VDC rail fluctuations. IC Role / Device Role / Timing Role: Power supervisor asserting reset on 24V-derived +5V rail drop, gating CE to EEPROM during fault, and monitoring isolated +3.3V logic supply via RESET IN. Use Value: Eliminates firmware crashes from partial power loss using 4.38V threshold accuracy and sub-2ns CE propagation delay. |
| Smart Energy Meters | Ruggedized Handheld Terminals |
Use Scenario: AMI meter storing tariff schedules and consumption logs across utility grid interruptions lasting seconds to minutes. IC Role / Device Role / Timing Role: Dual-supply supervisor managing main +5V rail and coin-cell backup, with RESET IN tracking RTC +3.0V supply for fail-safe timekeeping. Use Value: Ensures tamper-proof log continuity via <10µA quiescent draw and guaranteed 1.2V operation during capacitor hold-up decay. | Use Scenario: Field service terminal operating on Li-ion battery with hot-swap capability and persistent session state. IC Role / Device Role / Timing Role: System-level supervisor detecting main supply dropout, enabling battery backup to SRAM, and validating auxiliary 1.8V core rail via RESET IN. Use Value: Delivers zero-data-loss operation through 500ms brownouts using 40mV switchover hysteresis and 150ms reset timeout. |
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 function, but push-pull active-low RESET output instead of open-drain | Eliminates need for external pullup resistor; unsuitable where wired-OR reset bus is required | Select when driving single-load reset inputs directly without bus sharing |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no RESET IN input, 350ms timeout, 2.5µA IQ, SOT23-6 package | Lacks battery switchover, chip-enable gating, and auxiliary reset input; suited for simple reset-only applications | Select only if system requires basic reset generation without backup or CE control |
Compared with MAX6368PKA44+, the MAX6368LKA44+ provides open-drain flexibility for shared reset buses, while TPS3808G33DBVR offers lower quiescent current but omits battery backup, CE gating, and RESET IN-making it unsuitable as a functional replacement.
Availability
MAX6368LKA44+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and ruggedized handheld terminals requiring stable component supply and long-term lifecycle support.
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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6365–MAX6368 family was engineered specifically for µP-based systems needing integrated power supervision, battery backup, and memory write protection in ultra-small footprints.
FAQ
What is the factory-preset reset threshold voltage for MAX6368LKA44+?
The MAX6368LKA44+ has a factory-preset reset threshold of 4.38V (typical), with a guaranteed range of 4.25V to 4.50V over temperature. This value is laser-trimmed during production and applies to the primary VCC supply monitoring function. The threshold is specified in the Reset Threshold Ranges table of the datasheet and corresponds to the "44" suffix in the part number.
Does MAX6368LKA44+ support battery backup for SRAM, and how does switchover work?
Yes, MAX6368LKA44+ supports battery backup for SRAM via its integrated VCC/BATT switchover MOSFET. When VCC falls below the reset threshold and drops at least 20mV below VBATT, OUT automatically connects to BATT. A 40mV hysteresis prevents oscillation during slow VCC decay. In backup mode, MAX6368LKA44+ draws less than 1µA from the battery (at VBATT = 2.8V, excluding load current), preserving battery life.
What is the function of the RESET IN pin on MAX6368LKA44+?
The RESET IN pin on MAX6368LKA44+ is a dedicated comparator input referenced to an internal 1.235V precision bandgap. When the voltage at RESET IN falls below 1.235V (±50mV), the device asserts reset. It is designed for external undervoltage monitoring-e.g., using a resistor divider to detect failure of a secondary supply such as +5V, +3.3V, or +2.5V rails-enabling dual-rail fault detection beyond the primary VCC monitor.
What type of reset output does MAX6368LKA44+ provide, and what are its drive characteristics?
MAX6368LKA44+ provides an open-drain active-low RESET output. It sinks up to 1.6mA while asserted (VOL ≤ 0.3V at VCC > 2.1V) and exhibits leakage current ≤1µA when deasserted. Because it is open-drain, an external pullup resistor is required to establish a valid high level. This configuration supports wired-OR reset buses and compatibility with multiple logic families, including 1.2V–5.5V I/O domains.
Can MAX6368LKA44+ operate with supply voltages below 2.0V, and is reset functionality guaranteed?
Yes, MAX6368LKA44+ is fully specified to operate down to 1.2V on both VCC and VBATT. Reset assertion is guaranteed across this entire range: RESET remains valid and functional even when VCC or VBATT drops to 1.2V. This capability is critical for applications using single-cell Li-ion, NiMH, or coin-cell batteries where supply voltage decays significantly during discharge.
MAX6368LKA44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tube
- 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
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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