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Analog Devices Inc./Maxim Integrated MAX6367LKA44+T
- Part No.:
- MAX6367LKA44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6367LKA44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
The MAX6367LKA44+T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup control and chip-enable gating, featuring a factory-preset 4.38V reset threshold (min 4.25V, max 4.50V), 150ms minimum reset timeout, active-high BATT ON output, and operation down to 1.2V supply voltage. It monitors VCC for power-up, brownout, and power-down conditions while automatically switching CMOS RAM or real-time clocks to backup battery when main supply fails.
For engineers reviewing the MAX6367LKA44+T datasheet, MAX6367LKA44+T pinout, MAX6367LKA44+T application, or MAX6367LKA44+T equivalent, key selection criteria include its BATT ON indicator function, SOT23-8 package compatibility, guaranteed RESET/RESET validity down to 1.2V, and precise 4.38V reset threshold for +5V system monitoring.
Technical Context
The MAX6367LKA44+T implements a dedicated battery-on status indicator via a push-pull BATT ON output that drives high exclusively during battery-backup mode-triggered only when VCC falls below the 4.38V threshold *and* VBATT exceeds VCC by ≥20mV. Its internal MOSFET-based VCC/BATT switchover path delivers up to 150mA from VCC and maintains data retention in SRAM during main supply failure.
Chip-enable gating operates through a series transmission gate between CE IN and CE OUT, with 1.5ns propagation delay (typical) and 20Ω–100Ω on-resistance, disabling CE signal pass-through during reset assertion to prevent memory corruption. The device guarantees reset assertion down to 1.2V VCC or VBATT and exhibits 150ms minimum reset timeout with ±10% variation over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (typ), 4.25V–4.50V range - precisely targets +5V rail monitoring with margin for tolerance and drift |
| Reset Timeout Period | 150ms min - ensures µP completes full power-up initialization before release |
| Supply Voltage Range | 1.2V to 5.5V - supports ultra-low-voltage operation and legacy 5V systems |
| BATT ON Output Type | Push-pull active-high - provides direct logic-level indication of battery-backup mode without external pull-up |
| Quiescent Supply Current | 10µA (typ) - enables multi-year battery life in portable backup applications |
| VCC-to-OUT On-Resistance | 4.6Ω (typ at 2.38V, 25mA) - minimizes voltage drop and power loss during main-supply operation |
| Battery-Backup Current | 3µA (max at -40°C to +85°C) - preserves backup battery charge during extended outages |
Pinout & Package
MAX6367LKA44+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained embedded systems requiring reliable power supervision and battery switchover.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high continuously during VCC undervoltage, manual reset, or watchdog timeout; requires external pull-down for logic-low default state |
| 2 CE IN | Chip-enable input | Controls gating path to CE OUT; tied to GND or OUT if unused to disable CE pass-through |
| 3 GND | Ground reference | Primary return path for all internal circuits and output sinks |
| 4 BATT ON | Battery-on status indicator | Push-pull output driven high only when VCC < VTH and VBATT > VCC + 20mV - unambiguous backup-mode flag |
| 5 RESET IN | Not connected / No function | Unused pin for MAX6367 variant - electrically isolated per functional diagram and pin description |
| 6 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT until switchover condition is met |
| 7 OUT | Regulated output | Sources from VCC normally; switches to VBATT during backup mode - powers SRAM or RTC directly |
| 8 BATT | Backup battery input | Accepts 2.0V–5.5V; activates switchover when VBATT > VCC + 20mV and VCC < VTH |
Key Features
| Feature | Design Value |
|---|---|
| Battery-On Output Indicator | Dedicated push-pull BATT ON pin signals backup mode with no external components - eliminates need for discrete comparator or LED driver |
| On-Board Chip-Enable Gating | 1.5ns propagation delay and 20Ω–100Ω on-resistance enable safe, high-speed CE signal blocking during reset - prevents memory write errors in µP systems |
| Precision Reset Threshold | Factory-trimmed 4.38V (±0.13V) threshold ensures accurate +5V rail monitoring without external resistor networks |
| Ultra-Low Quiescent Current | 10µA typical ICC and 3µA max IBACK extend backup battery life to years in infrequently powered systems |
| Guaranteed 1.2V Operation | RESET/RESET and BATT ON remain functional down to 1.2V VCC or VBATT - supports deep brownout detection and low-voltage backup |
Applications
| Industrial Data Logger | Point-of-Sale Terminal |
|---|---|
Use Scenario: Maintains SRAM contents during AC power interruption in remote environmental monitoring units. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC brownout detection, automatic battery switchover, and BATT ON status signaling. Use Value: Prevents data loss during grid instability using 3µA backup current and 4.38V threshold aligned with 5V system rails. | Use Scenario: Preserves transaction buffer and clock settings during brief power dips in retail checkout systems. IC Role / Device Role / Timing Role: Power supervisor asserting reset and enabling battery-backed RAM retention with 150ms timeout. Use Value: Ensures deterministic µP restart and zero data corruption via CE gating and 1.5ns propagation delay. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Secures critical dosage history and calibration parameters during mains failure in battery-powered therapy devices. IC Role / Device Role / Timing Role: Battery-backup controller with BATT ON output driving safety-critical status indicator LED. Use Value: Push-pull BATT ON delivers immediate visual confirmation of backup activation without current-limiting resistors. | Use Scenario: Retains time-of-use billing data and tamper logs during utility outages in residential metering hardware. IC Role / Device Role / Timing Role: Low-power supervisory IC enabling long-term coin-cell operation with 10µA quiescent draw. Use Value: 1.2V operational guarantee ensures reliable reset assertion even as backup cell voltage depletes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367LKA46+T | Higher reset threshold (4.63V typ, 4.50V–4.75V range) | Better suited for +5V systems with tighter tolerance requirements or higher noise margins | Select when VCC nominal is 5.0V ±2% and brownout immunity must exceed 4.5V |
| MAX6367PKA44+T | Same reset threshold (4.38V) but push-pull active-low RESET output instead of open-drain active-high | Requires different µP reset input polarity and lacks BATT ON functionality | Choose only if target µP requires active-low reset and battery-status indication is handled externally |
Compared with MAX6367LKA44+T, MAX6367LKA46+T offers higher reset threshold for enhanced noise immunity on noisy 5V rails, while MAX6367PKA44+T sacrifices BATT ON functionality and reset polarity compatibility to meet legacy active-low µP interface requirements.
Availability
MAX6367LKA44+T is available at Aetrix Electronics and suitable for industrial data loggers, point-of-sale terminals, medical infusion pumps, and smart energy meters requiring stable component supply across extended production lifecycles.
Supply support for MAX6367LKA44+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 embedded environments.
The MAX6365–MAX6368 product line delivers integrated power-supply monitoring, battery-backup control, and memory write protection for microprocessor systems - targeting space-constrained, battery-sensitive applications where reliability and low quiescent current are critical.
FAQ
What is the primary function of the BATT ON pin on the MAX6367LKA44+T?
The BATT ON pin on the MAX6367LKA44+T is a push-pull active-high output that asserts high *only* when the device enters battery-backup mode - defined as VCC falling below the 4.38V reset threshold *and* VBATT exceeding VCC by at least 20mV. This provides unambiguous, logic-level status indication without external components. The MAX6367LKA44+T uses this pin to eliminate ambiguity in backup activation timing, supporting fail-safe system diagnostics in medical and industrial equipment.
Does the MAX6367LKA44+T support operation with a 3.3V main supply?
Yes, the MAX6367LKA44+T supports VCC supplies from 1.2V to 5.5V, including 3.3V systems. However, its factory-preset 4.38V reset threshold is optimized for +5V rails; using it with 3.3V VCC will cause continuous reset assertion since VCC remains below threshold. For 3.3V systems, select a variant with lower threshold (e.g., MAX6367LKA31, 3.08V typ). The MAX6367LKA44+T is specifically intended for 5V applications where precise brownout detection at 4.38V is required.
How does the chip-enable gating feature of the MAX6367LKA44+T protect memory during power failure?
The MAX6367LKA44+T gates the CE signal path between CE IN and CE OUT using a low-on-resistance transmission gate (20Ω–100Ω) that disables during reset assertion. When VCC drops below 4.38V, reset activates and blocks CE transitions, preventing spurious writes to SRAM or RTC during unstable power. The 1.5ns propagation delay ensures compatibility with high-speed µPs. This function is fully implemented in the MAX6367LKA44+T and requires no external logic - critical for preserving data integrity in POS and medical devices.
What is the guaranteed minimum reset timeout period for the MAX6367LKA44+T?
The MAX6367LKA44+T guarantees a minimum reset timeout period of 150ms after VCC rises above the 4.38V threshold, with typical value of 280ms and maximum of 400ms over temperature. This ensures sufficient hold time for microprocessor initialization sequences, especially in systems with slow-ramping power supplies or complex boot firmware. The 150ms minimum is production-tested and applies across the full -40°C to +85°C operating range - a key reliability parameter confirmed in the MAX6367LKA44+T datasheet's Electrical Characteristics table.
Can the MAX6367LKA44+T operate without a backup battery connected?
Yes, the MAX6367LKA44+T can operate without a backup battery: connect the BATT pin to GND and tie OUT directly to VCC. In this configuration, the device functions solely as a reset supervisor with BATT ON permanently low (since battery-backup mode cannot activate), while retaining all VCC monitoring, reset generation, and CE gating capabilities. This mode is explicitly supported in the MAX6367LKA44+T datasheet's "Operation Without a Backup Power Source" section and maintains full 1.2V operational capability.
MAX6367LKA44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- 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
MAX6367LKA44+T FAQ
1.How can I place an order for MAX6367LKA44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6367LKA44+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 MAX6367LKA44+T reliable?
The price and inventory of MAX6367LKA44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6367LKA44+T is usually 5 days.
3.What payment methods are accepted for MAX6367LKA44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6367LKA44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6367LKA44+T?
MAX6367LKA44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6367LKA44+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 MAX6367LKA44+T?
For technical support, including MAX6367LKA44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6367LKA44+T requirements.
6.How does Aetrix verify that MAX6367LKA44+T is sourced from the original manufacturer or authorized distributors?
All MAX6367LKA44+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 MAX6367LKA44+T meets industry standards.
7.What is the process for return or replacement of MAX6367LKA44+T?
All MAX6367LKA44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6367LKA44+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 MAX6367LKA44+T part is unused and in its original packaging.
Return procedure for MAX6367LKA44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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