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Analog Devices Inc./Maxim Integrated MAX6367PKA44+
- Part No.:
- MAX6367PKA44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6367PKA44+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,776
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Product details
Overview
The MAX6367PKA44+ from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup control, chip-enable gating, and a dedicated BATT ON output indicator. It monitors VCC supply voltage (reset threshold = 4.38V), provides automatic VCC-to-battery switchover during brownout, gates CE signals with 1.5ns propagation delay, and asserts active-high reset. It is used in portable equipment requiring reliable memory retention during power failure.
For engineers reviewing the MAX6367PKA44+ datasheet, MAX6367PKA44+ pinout, MAX6367PKA44+ application, or MAX6367PKA44+ equivalent, key selection criteria include its 4.38V factory-set reset threshold, BATT ON push-pull output behavior, 150ms minimum reset timeout, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6367PKA44+ integrates a precision voltage monitor, bidirectional VCC/BATT power-path switch, and a dedicated push-pull BATT ON output that drives high exclusively in battery-backup mode. Its internal transmission gate enables CE IN to CE OUT signal pass-through only when reset is deasserted, with 12µs hold time if CE IN is low at reset assertion.
It operates from 1.2V to 5.5V on VCC or VBATT, guarantees RESET/RESET validity down to 1.2V, and features 40mV hysteresis on the VCC–VBATT switchover threshold to prevent oscillation during slow VCC decay. The BATT ON output sinks 3.2mA at 0.1V saturation and sources ~10µA from OUT in backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (factory preset, ±0.13V tolerance); ensures reliable reset initiation for +5V systems operating near nominal rail. |
| Reset Timeout Period | 150ms min; guarantees µP initialization completes before release from reset after VCC recovery. |
| Quiescent Supply Current | 10µA (typ) at VCC = 5.5V; enables multi-year battery life in always-on backup applications. |
| BATT ON Output Type | Push-pull active-high; directly drives LEDs or base of external PNP pass transistor without pull-up resistor. |
| VCC-to-BATT Switchover Hysteresis | 40mV; prevents chattering during gradual VCC droop by requiring 20mV rise above VBATT to re-engage main supply. |
| CE IN to CE OUT Propagation Delay | 1.5ns (typ); supports high-speed µP address/data bus gating without timing violation. |
| Operating Voltage Range | 1.2V to 5.5V on VCC or VBATT; allows operation across Li-ion, coin-cell, and regulated logic rails. |
Pinout & Package
MAX6367PKA44+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for PCB area-constrained embedded designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC < 4.38V, MR low, or reset event; requires external pull-down for logic-low default state. |
| 2 CE IN | Chip-enable input | Drives CE OUT only when reset is deasserted; connect to GND or OUT if unused. |
| 3 GND | Ground reference | Primary return path for VCC, BATT, and all internal switching circuits. |
| 4 BATT ON | Battery-on status indicator | Push-pull output driven high only when device is in battery-backup mode (VCC < VTH and VCC < VBATT). |
| 5 RESET IN | Not connected / No function | Unused pin for MAX6367 family; electrically isolated and must be left floating or tied to GND. |
| 6 VCC | Main supply input | Primary power source (1.2V–5.5V); reset asserts when voltage falls below 4.38V. |
| 7 OUT | Regulated output supply | Sources from VCC normally; switches to VBATT during brownout; delivers up to 150mA from VCC, 20mA from battery. |
| 8 BATT | Backup battery input | Accepts 2.0V–5.5V backup source; internal MOSFET connects to OUT when VCC fails and VBATT > VCC + 20mV. |
Key Features
| Feature | Design Value |
|---|---|
| Battery-On Output Indicator | Dedicated push-pull BATT ON pin confirms backup mode activation without software polling or external logic. |
| On-board Chip-Enable Gating | 1.5ns propagation delay CE IN → CE OUT path prevents SRAM write corruption during power faults. |
| Ultra-Low Quiescent Current | 10µA typical ICC enables >10-year coin-cell lifetime in memory-retention applications. |
| VCC-to-BATT Switchover Control | Automatic MOSFET-based power-path selection with 40mV hysteresis eliminates need for external diode-or or controller. |
| Reset Valid Down to 1.2V | Guaranteed RESET/RESET functionality even as VCC or VBATT decays to 1.2V, ensuring robust brownout response. |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retaining real-time sensor data during AC power loss or battery swap. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, automatic SRAM backup power switchover, and BATT ON status signaling. Use Value: Prevents data loss during 100ms–500ms power interruption; BATT ON output drives LED alert and enables low-power sleep mode entry. | Use Scenario: Remote environmental sensor node logging temperature/humidity to nonvolatile RAM over weeks on primary battery. IC Role / Device Role / Timing Role: Power supervisor managing VCC monitoring, backup battery engagement, and CE gating to protect RAM writes. Use Value: 10µA quiescent current extends primary battery life; 150ms reset timeout ensures µC firmware initializes fully before resuming sampling. |
| Retail POS Terminals | Smart Energy Meters |
Use Scenario: Point-of-sale terminal preserving transaction buffer and configuration settings during brief grid outage or UPS transition. IC Role / Device Role / Timing Role: System supervisor asserting reset during VCC dip, enabling battery-backed SRAM retention via OUT, and signaling backup mode via BATT ON. Use Value: Eliminates need for supercapacitor or large backup capacitor; BATT ON output triggers secure shutdown sequence in µP firmware. | Use Scenario: Electricity meter maintaining time-of-use billing registers and tamper logs during mains failure. IC Role / Device Role / Timing Role: Critical power monitor providing precise 4.38V reset threshold for +5V rail, battery switchover, and CE gating for flash write protection. Use Value: Factory-trimmed 4.38V threshold matches standard 5V regulator tolerance; 40mV switchover hysteresis prevents false toggling during noisy line conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367HKA44+ | Same reset threshold (4.38V) and BATT ON function, but uses push-pull active-high RESET output instead of open-drain. | Requires no external pull-down on RESET; better suited for direct µP reset input without level-shifting. | Select MAX6367HKA44+ when µP reset pin expects active-high push-pull drive and board layout cannot accommodate pull-down resistor. |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no BATT ON output, no battery switchover or CE gating; only provides reset generation. | Lacks battery management functions; suitable only for basic reset supervision where backup power is handled externally. | Choose TPS3808G33DBVR only if system already implements discrete battery switchover and CE control, and 3.3V reset threshold suffices. |
Compared with MAX6367PKA44+, MAX6367HKA44+ simplifies reset interface design by eliminating external pull-down needs, while TPS3808G33DBVR reduces cost and footprint in applications omitting battery-backup requirements entirely.
Availability
MAX6367PKA44+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, retail POS terminals, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6367PKA44+ 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, computing, and communications applications.
The MAX6365–MAX6368 product line delivers integrated µP supervisory functions-including reset generation, battery switchover, and CE gating-in ultra-small SOT23 packages for space- and power-sensitive embedded systems.
FAQ
What is the factory-set reset threshold voltage for MAX6367PKA44+?
The MAX6367PKA44+ has a factory-set reset threshold of 4.38V (typical), with a guaranteed range of 4.25V to 4.50V across temperature and process variation. This value is laser-trimmed during production and applies to VCC monitoring only; it is not adjustable. The threshold ensures reliable reset assertion for +5V systems operating within standard regulator tolerances, and is documented in the Reset Threshold Ranges table of the MAX6365–MAX6368 datasheet.
Does MAX6367PKA44+ support battery-backup operation, and how does it switch between VCC and BATT?
Yes, MAX6367PKA44+ supports automatic battery-backup operation. It switches to BATT when two conditions are met: VCC falls below the 4.38V reset threshold, and VCC is at least 20mV lower than VBATT. A 40mV hysteresis prevents oscillation during slow VCC decay. During backup mode, OUT is sourced from BATT, and the BATT ON pin drives high to indicate active backup. The device draws only 3µA from VBATT (typ) in this state, enabling multi-year coin-cell operation.
What is the function of the BATT ON pin on MAX6367PKA44+, and what are its electrical characteristics?
The BATT ON pin on MAX6367PKA44+ is a push-pull active-high output that asserts high exclusively when the device is in battery-backup mode (i.e., VCC < 4.38V and VCC < VBATT). It sinks 3.2mA at 0.1V saturation voltage and sources ~10µA from OUT in backup mode. This pin eliminates the need for external logic to detect backup status and can directly drive LEDs, optocouplers, or the base of an external PNP pass transistor for higher-current backup loads.
Can MAX6367PKA44+ be used without a backup battery, and how should BATT and OUT be connected?
Yes, MAX6367PKA44+ can operate without a backup battery. In this configuration, connect BATT to GND and OUT directly to VCC. This disables battery switchover and BATT ON output (which remains low), while retaining full reset supervision and CE gating functionality. The device continues to monitor VCC, assert RESET on undervoltage, and gate CE IN to CE OUT - making it suitable for cost-sensitive applications where backup power is unnecessary but robust power monitoring is required.
What is the purpose of the CE IN and CE OUT pins on MAX6367PKA44+, and how do they behave during reset?
The CE IN and CE OUT pins on MAX6367PKA44+ implement hardware chip-enable gating to prevent erroneous SRAM writes during power faults. During normal operation, CE IN passes through to CE OUT with 1.5ns propagation delay. When reset asserts, CE OUT is immediately disabled: if CE IN is low at reset assertion, CE OUT stays low for 12µs (typ) to complete ongoing memory access; if CE IN is high, CE OUT remains high. This behavior ensures data integrity without µP intervention or software overhead.
MAX6367PKA44+ 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:
- Open Drain or Open Collector
- 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
MAX6367PKA44+ FAQ
1.How can I place an order for MAX6367PKA44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6367PKA44+ 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 MAX6367PKA44+ reliable?
The price and inventory of MAX6367PKA44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6367PKA44+ is usually 5 days.
3.What payment methods are accepted for MAX6367PKA44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6367PKA44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6367PKA44+?
MAX6367PKA44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6367PKA44+ 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 MAX6367PKA44+?
For technical support, including MAX6367PKA44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6367PKA44+ requirements.
6.How does Aetrix verify that MAX6367PKA44+ is sourced from the original manufacturer or authorized distributors?
All MAX6367PKA44+ 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 MAX6367PKA44+ meets industry standards.
7.What is the process for return or replacement of MAX6367PKA44+?
All MAX6367PKA44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6367PKA44+, 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 MAX6367PKA44+ part is unused and in its original packaging.
Return procedure for MAX6367PKA44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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