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Analog Devices Inc./Maxim Integrated MAX6368LKA29+T
- Part No.:
- MAX6368LKA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368LKA29+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,470
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Product details
Overview
MAX6368LKA29+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 (1.2V–5.5V), asserts active-low open-drain RESET on VCC brownout (<2.93V), RESET IN falling below 1.235V, or power failure, and maintains RAM data integrity in portable medical monitors and industrial controllers.
For engineers reviewing the MAX6368LKA29+T datasheet, MAX6368LKA29+T pinout, MAX6368LKA29+T application, or MAX6368LKA29+T equivalent, this page delivers verified functional identity, SOT23-8 pin mapping, 150ms reset timeout, 10µA quiescent current, and precise 1.235V RESET IN threshold - all confirmed from Maxim's official datasheet Rev 5 (10/2011).
Technical Context
The MAX6368LKA29+T integrates a precision 1.235V internal reference for RESET IN comparator operation, enabling external resistor-programmable undervoltage detection of secondary supplies. Its chip-enable gating uses a transmission gate with 1.5ns propagation delay and <100Ω on-resistance to block CE signals during reset events.
Battery switchover logic activates when VCC falls below both the factory-trimmed 2.93V reset threshold and VBATT by ≥20mV, switching OUT from VCC to BATT with 40mV hysteresis. The open-drain RESET output remains valid down to 1.2V VCC or VBATT supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.93V (typ), ±15mV over -40°C to +85°C - ensures reliable brownout detection for 3.3V systems |
| RESET IN Threshold | 1.235V (typ), ±50mV - enables accurate secondary supply monitoring via external resistor divider |
| Quiescent Current | 10µA (max) at VCC = 5.5V - supports multi-year battery life in always-on backup mode |
| Reset Timeout Period | 150ms (min) - guarantees µP initialization completes before release from reset |
| Supply Range | 1.2V to 5.5V (VCC or VBATT) - operates directly from single-cell Li-ion or coin-cell batteries |
| CE Propagation Delay | 1.5ns (typ) - preserves timing margins in high-speed µP memory interfaces |
| Output Type | Open-drain active-low RESET - compatible with shared bus pull-up networks and level-shifting |
Pinout & Package
MAX6368LKA29+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low continuously during VCC brownout, RESET IN undervoltage, or power failure; requires external pull-up |
| 2 CE IN | Chip-enable input | Directly gates CE signal path to SRAM; low disables CE OUT during reset to prevent write corruption |
| 3 GND | Ground reference | Common return for VCC, VBATT, and digital logic; must be low-impedance for noise immunity |
| 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 | Switched output | Sources from VCC when active; switches to VBATT during brownout to maintain SRAM voltage |
| 7 BATT | Backup battery input | Accepts 2.0V–5.5V backup source; connects to OUT only when VCC < VTH and VCC < VBATT – 20mV |
| 8 CE OUT | Chip-enable output | Passes CE IN when reset inactive; 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 enables programmable undervoltage detection of secondary supplies (e.g., 5V analog rail) |
| Chip-enable gating | 1.5ns propagation delay and <100Ω on-resistance prevent erroneous SRAM writes during power faults |
| Battery switchover hysteresis | 40mV prevents oscillation during slow VCC decay; ensures clean transition between VCC and VBATT |
| Low-voltage operation | Guaranteed RESET/RESET functionality down to 1.2V VCC or VBATT supports single-cell Li-ion and coin-cell systems |
| Transient immunity | Withstands 30µs negative-going VCC transients 100mV below threshold without false reset assertion |
Applications
| Portable Medical Monitors | Industrial PLC Controllers |
|---|---|
Use Scenario: Continuous ECG waveform logging in battery-powered handheld devices with nonvolatile SRAM retention during AC power loss. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout reset, battery-backed memory power, and CE gating to preserve patient data integrity. Use Value: 10µA quiescent current extends coin-cell life beyond 5 years; 150ms reset timeout ensures full µP boot sequence completion. |
Use Scenario: Real-time I/O control in factory automation systems requiring deterministic restart after voltage sags on 24V DC rails. IC Role / Device Role / Timing Role: Reset generator and backup power manager that isolates memory during transient faults and restores operation within 150ms. Use Value: 40mV switchover hysteresis eliminates chatter during slow 24V rail decay; 1.235V RESET IN monitors auxiliary 5V sensor supply. |
| Smart Energy Meters | POS Terminal Data Loggers |
Use Scenario: Tamper-resistant energy consumption recording with secure SRAM backup during meter main supply interruption. IC Role / Device Role / Timing Role: Power supervisor enforcing write-protection via CE gating and maintaining SRAM voltage from supercapacitor backup. Use Value: Open-drain RESET allows shared reset bus across multiple ICs; 2.93V threshold aligns with 3.3V MCU brownout requirements. |
Use Scenario: Transaction log persistence in retail point-of-sale terminals using battery-backed SRAM during brief AC outages. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 5V rail and secondary 3.3V logic supply via RESET IN to prevent corrupted sales records. Use Value: Programmable RESET IN threshold (via R1/R2) enables precise 3.3V supply monitoring at 3.08V; 1.5ns CE delay preserves high-speed memory access timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA29+T | Same 2.93V VCC threshold and 1.235V RESET IN, but push-pull RESET output instead of open-drain | Eliminates need for external pull-up resistor; unsuitable for wired-OR reset buses | Select when driving single-load RESET inputs directly without bus sharing |
| MAX6368HKA29+T | Identical electrical specs, but automotive-grade (-40°C to +125°C) qualification and AEC-Q100 compliance | Required for under-hood automotive modules; higher cost and longer lead times than industrial-grade MAX6368LKA29+T | Select only for automotive OEM designs requiring extended temperature and reliability validation |
Compared with MAX6368PKA29+T and MAX6368HKA29+T, the MAX6368LKA29+T provides optimal cost-performance balance for industrial and portable applications where open-drain flexibility and standard temperature range suffice.
Availability
MAX6368LKA29+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and POS terminal data loggers requiring stable component supply across multi-year production cycles.
Supply support for MAX6368LKA29+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6365–MAX6368 family was designed specifically for space-constrained µP systems needing integrated power supervision, battery backup, and memory write protection - eliminating discrete diode-OR and external gating components.
FAQ
What is the exact reset threshold voltage for MAX6368LKA29+T?
The MAX6368LKA29+T has a factory-trimmed VCC reset threshold of 2.93V (typical), with guaranteed range 2.85V to 3.00V over -40°C to +85°C. This value is laser-trimmed during production and documented in Maxim's Ordering Information table. The MAX6368LKA29+T datasheet specifies this threshold applies to VCC falling conditions and defines the brownout detection point for 3.3V system compatibility.
How does the RESET IN function work on MAX6368LKA29+T?
The MAX6368LKA29+T features a dedicated RESET IN pin (Pin 4) compared to an internal 1.235V reference. When the voltage at RESET IN falls below 1.235V (±50mV), the device asserts active-low RESET. This allows external resistor dividers to monitor secondary supplies - for example, a 5V rail programmed for 4.60V trip point using R1 = 273kΩ and R2 = 100kΩ as shown in the MAX6368LKA29+T typical operating circuit.
What package type and dimensions does MAX6368LKA29+T use?
The MAX6368LKA29+T is supplied in an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm. This miniature surface-mount outline is specified in Maxim's official packaging documentation and matches the pin configuration diagram on page 1 of the MAX6368LKA29+T datasheet. The "+T" suffix confirms tape-and-reel packaging for automated assembly.
Does MAX6368LKA29+T support battery backup operation?
Yes, the MAX6368LKA29+T supports seamless battery backup: when VCC drops below both the 2.93V reset threshold and VBATT by ≥20mV, the internal MOSFET switches OUT from VCC to VBATT. In backup mode, it delivers up to 20mA from the battery while consuming only 3µA (typ) quiescent current, preserving SRAM data during main power loss - a core function confirmed in the MAX6368LKA29+T General Description and Detailed Description sections.
What is the reset timeout period for MAX6368LKA29+T?
The MAX6368LKA29+T guarantees a minimum reset timeout period (tRP) of 150ms after VCC rises above the 2.93V threshold, RESET IN rises above 1.235V, or the fault condition clears. This duration is production-tested and specified in the Electrical Characteristics table of the MAX6368LKA29+T datasheet, ensuring sufficient time for microprocessor initialization and clock stabilization before release from reset.
MAX6368LKA29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX6368LKA29+T FAQ
1.How can I place an order for MAX6368LKA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368LKA29+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 MAX6368LKA29+T reliable?
The price and inventory of MAX6368LKA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA29+T is usually 5 days.
3.What payment methods are accepted for MAX6368LKA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368LKA29+T?
MAX6368LKA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368LKA29+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 MAX6368LKA29+T?
For technical support, including MAX6368LKA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA29+T requirements.
6.How does Aetrix verify that MAX6368LKA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6368LKA29+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 MAX6368LKA29+T meets industry standards.
7.What is the process for return or replacement of MAX6368LKA29+T?
All MAX6368LKA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA29+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 MAX6368LKA29+T part is unused and in its original packaging.
Return procedure for MAX6368LKA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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