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Analog Devices Inc./Maxim Integrated MAX6368LKA44+T
- Part No.:
- MAX6368LKA44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368LKA44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6368LKA44+T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable 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 4.38V (typ), provides 150ms minimum reset timeout, and supports 1.235V precision RESET IN threshold for secondary supply monitoring. It is used in portable equipment requiring reliable power-fail detection and SRAM data retention.
For engineers reviewing the MAX6368LKA44+T datasheet, MAX6368LKA44+T pinout, MAX6368LKA44+T application, or MAX6368LKA44+T equivalent, key selection criteria include its 4.38V factory-set VTH, 1.235V RESET IN comparator accuracy, 10µA quiescent current, 8-pin SOT23 package, and support for battery-backed CMOS RAM write protection in brownout conditions.
Technical Context
The MAX6368LKA44+T integrates a precision voltage monitor, an auxiliary reset comparator referenced to 1.235V, a bidirectional VCC/BATT switchover MOSFET, and a transmission-gate-based CE signal gate with 1.5ns propagation delay. Its reset logic combines VCC undervoltage detection, RESET IN assertion, and internal timing control to guarantee reset hold time ≥150ms after recovery.
It operates across -40°C to +85°C with guaranteed RESET/RESET validity down to 1.2V on either VCC or VBATT, and features 40mV hysteresis on battery switchover to prevent chatter during slow VCC decay. The device uses no external components for basic operation but supports resistor-programmable RESET IN thresholds via the internal 1.235V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 4.25V (min) to 4.50V (max), typ 4.38V - sets precise power-fail detection point for +5V or +3.3V systems |
| RESET IN Threshold (VRTH) | 1.185V–1.285V, typ 1.235V - enables accurate secondary supply monitoring using external resistor divider |
| Quiescent Supply Current | 15µA (max) at VCC = 5.5V - ensures minimal battery drain in backup mode |
| Reset Timeout Period (tRP) | 150ms (min) to 280ms (max) - guarantees sufficient µP initialization time after power recovery |
| VCC-to-OUT On-Resistance | 4.6Ω (typ) at VCC = 2.38V, IOUT = 25mA - supports up to 150mA output from main supply |
| Battery-Backup Supply Current | 3µA (max) at TA = -40°C to +85°C - preserves battery life during extended VCC loss |
| CE IN to CE OUT Propagation Delay | 2ns (min) to 9ns (max) - maintains high-speed memory access integrity during fault conditions |
Pinout & Package
MAX6368LKA44+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable and industrial applications. Pin numbering follows standard SOT23 top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low continuously during VCC < VTH or RESET IN < 1.235V; remains asserted ≥150ms after recovery |
| 2 CE IN | Chip-enable input | Controls CE gating path; low disables CE OUT during reset to prevent erroneous SRAM writes |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection |
| 4 RESET IN | Auxiliary reset input | Compares against internal 1.235V reference; falling edge below threshold triggers reset assertion |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and supplies OUT when above VTH and > VBATT |
| 6 OUT | Power output | Sources from VCC (up to 150mA) or BATT (in backup mode); connects to SRAM VDD |
| 7 BATT | Backup battery input | Supplies OUT when VCC < VTH and VCC < VBATT − 20mV; requires ≥2.25V for valid operation |
| 8 CE OUT | Chip-enable output | Passes CE IN signal during normal operation; 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 undervoltage detection for secondary rails |
| VCC/BATT switchover with hysteresis | 40mV hysteresis prevents oscillation during slow VCC decay; automatic transition preserves SRAM data |
| Chip-enable gating with 1.5ns delay | Series transmission gate blocks CE signals during reset, preventing corrupted memory writes without added logic |
| Ultra-low quiescent current | 10µA typical ICC and 3µA IBACK ensure multi-year battery life in backup mode |
| Guaranteed 1.2V operation | RESET/RESET valid down to 1.2V on VCC or VBATT - supports deep brownout detection in low-voltage systems |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered ECG monitor retains real-time waveform buffer during AC power interruption. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and secondary 1.8V sensor supply; asserts RESET and gates CE to freeze SRAM writes during brownout. Use Value: Prevents data corruption using 1.235V RESET IN to monitor 1.8V rail and 150ms tRP to ensure safe µC restart. |
Use Scenario: Programmable logic controller maintains I/O state and configuration memory during factory line voltage dips. IC Role / Device Role / Timing Role: Monitors 5V system rail (VTH = 4.38V) and switches SRAM to backup battery; gates CE to block spurious writes during reset. Use Value: 4.6Ω VCC-to-OUT RON delivers 150mA to SRAM; 40mV switchover hysteresis eliminates relay chatter during slow VCC sag. |
| Point-of-Sale Terminal | Set-Top Box Firmware Storage |
Use Scenario: Retail terminal preserves transaction log and encryption keys during brief utility outages. IC Role / Device Role / Timing Role: Uses RESET IN to supervise 2.5V crypto IC supply while monitoring 3.3V main rail; holds RESET until full recovery. Use Value: 1.235V reference enables accurate 2.5V rail monitoring with <1% error; 10µA IBACK extends coin-cell life beyond 5 years. |
Use Scenario: Consumer STB retains channel lineup and parental controls during nightly power cycling. IC Role / Device Role / Timing Role: Provides battery-backed power to 512KB SRAM and gates CE to prevent firmware overwrite during unstable 3.3V startup. Use Value: 150ms tRP ensures bootloader execution completes before µP exits reset; 2ns CE propagation delay preserves high-speed bus timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367LKA44+T | Includes BATT ON push-pull indicator output instead of RESET IN; same VTH, package, and timing | Used where visual/external indication of battery mode is required, not secondary supply monitoring | Select MAX6367LKA44+T when BATT ON status signaling is needed; MAX6368LKA44+T is preferred for dual-rail supervision |
| TPS3808G33DBVR | Fixed 3.08V reset threshold, no auxiliary reset input, higher 25µA ICC, same SOT23-8 package | Limited to single-supply monitoring; lacks RESET IN capability for secondary rail supervision | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only systems without secondary supply monitoring needs |
Compared with MAX6367LKA44+T and TPS3808G33DBVR, MAX6368LKA44+T uniquely supports precision secondary supply monitoring via its 1.235V RESET IN comparator-enabling dual-rail fault detection in a single 8-pin SOT23 device without external comparators or resistors.
Availability
MAX6368LKA44+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLCs, point-of-sale terminals, and set-top boxes requiring stable component supply, long-term lifecycle support, and guaranteed performance across -40°C to +85°C.
Supply support for MAX6368LKA44+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 interface applications in industrial, automotive, and computing markets.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated power supervision, battery backup, and memory write protection - eliminating discrete diodes, MOSFETs, and comparators in compact portable and embedded designs.
FAQ
What is the factory-set reset threshold voltage for MAX6368LKA44+T?
The MAX6368LKA44+T has a factory-set reset threshold (VTH) of 4.25V (min), 4.38V (typ), and 4.50V (max), optimized for reliable monitoring of +5V and +3.3V power rails. This value is laser-trimmed during production and does not require external calibration. The MAX6368LKA44+T uses this threshold to assert RESET when VCC falls below the specified range and maintain assertion for ≥150ms after VCC recovers.
How does the RESET IN function work on MAX6368LKA44+T?
The RESET IN pin on MAX6368LKA44+T compares the applied voltage against an internal 1.185V–1.285V (typ 1.235V) reference. When RESET IN falls below this threshold, the device asserts active-low RESET. The input draws ≤25nA, enabling high-impedance resistor-divider programming for secondary supply monitoring. The MAX6368LKA44+T guarantees 1.5µs propagation delay from RESET IN falling edge to RESET assertion.
What package type and dimensions does MAX6368LKA44+T use?
MAX6368LKA44+T is supplied in an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm with standard gull-wing leads. It is RoHS-compliant and lead(Pb)-free, indicated by the "+T" suffix. The package supports reflow soldering at peak temperatures up to +260°C and is rated for operation from -40°C to +85°C. This compact footprint enables integration into dense PCB layouts typical of handheld and IoT devices.
Does MAX6368LKA44+T support battery-backup operation, and how does switchover work?
Yes, MAX6368LKA44+T supports seamless battery-backup operation. When VCC drops below the reset threshold and falls 20mV below VBATT, the internal MOSFET switches OUT from VCC to BATT. A 40mV hysteresis prevents oscillation during slow VCC decay. In backup mode, MAX6368LKA44+T draws only 3µA from the battery (excluding load current), preserving runtime. OUT remains powered from BATT until VCC rises 20mV above VBATT.
What is the purpose of the CE IN and CE OUT pins on MAX6368LKA44+T?
The CE IN and CE OUT pins implement hardware-enforced chip-enable gating to prevent erroneous writes to CMOS RAM during power faults. During normal operation, CE IN passes directly to CE OUT with ≤9ns propagation delay. When RESET asserts, CE OUT is disabled: if CE IN was low, CE OUT stays low for 12µs; if CE IN was high, CE OUT remains high. This behavior ensures memory integrity without software intervention - a core function of the MAX6368LKA44+T.
MAX6368LKA44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- 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+T FAQ
1.How can I place an order for MAX6368LKA44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368LKA44+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 MAX6368LKA44+T reliable?
The price and inventory of MAX6368LKA44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA44+T is usually 5 days.
3.What payment methods are accepted for MAX6368LKA44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368LKA44+T?
MAX6368LKA44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368LKA44+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 MAX6368LKA44+T?
For technical support, including MAX6368LKA44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA44+T requirements.
6.How does Aetrix verify that MAX6368LKA44+T is sourced from the original manufacturer or authorized distributors?
All MAX6368LKA44+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 MAX6368LKA44+T meets industry standards.
7.What is the process for return or replacement of MAX6368LKA44+T?
All MAX6368LKA44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA44+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 MAX6368LKA44+T part is unused and in its original packaging.
Return procedure for MAX6368LKA44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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