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Analog Devices Inc./Maxim Integrated MAX6367LKA31+
- Part No.:
- MAX6367LKA31+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6367LKA31+.pdf
- Description:
- MAX6367 LOW-POWER MICROPROCESSO
- Quantity:
- Payment:
- Shipping:
Inventory:249
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Product details
Overview
MAX6367LKA31+ from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup switchover, chip-enable gating, and BATT ON indicator output. It monitors VCC supply voltage (reset threshold = 3.08V), asserts active-high open-drain RESET during power-up/down/brownout, switches OUT to backup battery when VCC < VTH and VCC < VBATT, and drives BATT ON high in battery-backup mode. Used in portable POS terminals and industrial controllers requiring nonvolatile memory retention during main power loss.
For engineers reviewing the MAX6367LKA31+ datasheet, MAX6367LKA31+ pinout, MAX6367LKA31+ application, or MAX6367LKA31+ equivalent, key selection criteria include its 3.08V factory-trimmed reset threshold, 150ms minimum reset timeout, 10µA quiescent current, BATT ON push-pull output capability, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6367LKA31+ integrates a precision voltage monitor, bidirectional VCC/BATT switchover MOSFET controller, and dedicated BATT ON status output. Its internal comparator compares VCC against a 3.08V threshold (±1.5% over temperature), triggering reset assertion and battery switchover simultaneously when VCC falls below VTH and VBATT exceeds VCC by ≥20mV.
BATT ON operates as a push-pull output sourcing ~10µA from OUT in backup mode and sinking 3.2mA at 0.4V saturation; CE IN/CE OUT provides 1.5ns propagation delay chip-enable gating with 20–100Ω on-resistance, disabling write access to SRAM during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (factory-trimmed, ±1.5% over -40°C to +85°C) - ensures reliable reset initiation for 3.3V systems with margin |
| Reset Timeout Period | 150ms minimum - guarantees µP initialization completes before release |
| Quiescent Supply Current | 10µA (typical at VCC = 5.5V) - enables multi-year battery backup in always-on devices |
| BATT ON Output Type | Push-pull active-high - directly drives LEDs or external pass transistors without pull-up resistors |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and standard logic rails |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC decay near threshold |
| Chip-Enable Propagation Delay | 1.5ns - compatible with high-speed µPs and DSPs without timing penalty |
Pinout & Package
MAX6367LKA31+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for PCB area-constrained applications. Pin 1 is marked with a dot; pin numbering follows standard SOT23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC brownout/power-down; requires external pull-down for logic-low default state |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low disables write path during reset or power fault |
| 3 GND | Ground reference | Common return for all analog/digital functions; must be low-impedance connection |
| 4 BATT ON | Battery-backup status indicator | Drives high only when OUT is sourced from BATT - used for LED indication or external transistor base drive |
| 5 VCC | Main supply input | Primary power source (1.2V–5.5V); reset triggers when VCC drops below 3.08V |
| 6 OUT | Regulated output | Sources from VCC normally; switches to BATT (if > VCC + 20mV) during brownout - powers SRAM directly |
| 7 BATT | Backup battery input | Accepts 2.0V–5.5V; internal MOSFET connects BATT to OUT with on-resistance < 4.6Ω at 2.38V/25mA |
| 8 CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs after reset assertion to complete ongoing memory access |
Key Features
| Feature | Design Value |
|---|---|
| Battery-On output | Push-pull active-high BATT ON signal eliminates need for external pull-up and simplifies status monitoring |
| Precision reset threshold | 3.08V ±1.5% over full temperature range ensures consistent reset behavior across operating environments |
| Ultra-low quiescent current | 10µA typical supply current extends battery life in backup mode beyond 10 years for typical 20mAh coin cells |
| VCC-to-BATT switchover | Automatic seamless transition with 40mV hysteresis prevents chatter during slow VCC decay |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance enable direct interface with high-speed µPs without timing violation |
Applications
| POS Terminal Memory Backup | Industrial PLC Real-Time Clock Hold |
|---|---|
|
Use Scenario: Maintaining SRAM contents and RTC registers during AC mains interruption in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, automatic BATT switchover to coin cell, and BATT ON status signaling. Use Value: Guarantees zero data loss during 100ms–5s power gaps; BATT ON output drives status LED and enables external backup power management. |
Use Scenario: Preserving configuration and timekeeping in programmable logic controllers during factory power fluctuations. IC Role / Device Role / Timing Role: Voltage monitor and battery switchover controller ensuring continuous RTC operation and SRAM retention. Use Value: 3.08V threshold matches 3.3V system rail with safety margin; 150ms reset timeout satisfies IEC 61000-4-11 immunity requirements. |
| Portable Medical Data Logger | Smart Meter Nonvolatile Storage |
|
Use Scenario: Securing sensor calibration data and event logs in battery-powered medical recorders during battery replacement. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET and enabling BATT-backed SRAM write protection during VCC interruption. Use Value: 10µA backup current allows >5-year operation on CR2032; CE IN/CE OUT gating prevents corrupted writes during switchover transients. |
Use Scenario: Protecting firmware and tariff data in utility smart meters subjected to grid instability and lightning-induced sags. IC Role / Device Role / Timing Role: Precision voltage supervisor with transient-immune reset generation and battery-fail indication via BATT ON. Use Value: 100mV transient immunity (30µs max) meets ANSI C12.1 surge immunity; BATT ON signals end-of-battery-life to meter firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367PKA31+ | Same 3.08V reset threshold and BATT ON function, but features push-pull RESET output instead of open-drain | Requires no external pull-down resistor; better suited for driving TTL inputs directly | Select when interfacing with legacy µPs needing active-low push-pull reset without external components |
| MAX6367HKA31+ | Identical functionality and pinout, but rated for automotive AEC-Q100 Grade 3 (-40°C to +105°C) | Validated for under-hood and infotainment systems requiring extended temperature operation | Choose for automotive telematics or ADAS modules where ambient temperature exceeds +85°C |
Compared with MAX6367LKA31+, the PKA variant offers simplified reset interface at the cost of flexibility in bus-sharing configurations, while the HKA variant adds automotive qualification without altering electrical behavior - both retain identical battery switchover, CE gating, and BATT ON functionality.
Availability
MAX6367LKA31+ is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLCs, medical data loggers, and smart meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6367LKA31+ 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 consumer applications.
The MAX6365–MAX6368 family delivers integrated µP supervision with battery backup and memory write protection, targeting space- and power-constrained embedded systems requiring high reliability during power faults.
FAQ
What is the exact reset threshold voltage for MAX6367LKA31+?
The MAX6367LKA31+ has a factory-trimmed reset threshold of 3.08V (typical), with a guaranteed range of 3.00V to 3.15V over the full -40°C to +85°C operating temperature range. This value is permanently laser-trimmed during production and does not require external resistor programming - it is fixed for this specific part number.
Does MAX6367LKA31+ support battery backup for CMOS RAM?
Yes, MAX6367LKA31+ directly supports battery backup for CMOS RAM via its OUT pin, which automatically switches from VCC to BATT when VCC falls below the 3.08V threshold and VBATT exceeds VCC by ≥20mV. The device sources up to 150mA from VCC and maintains SRAM power during brownout using the backup battery connected to the BATT pin.
What is the function of the BATT ON pin on MAX6367LKA31+?
The BATT ON pin on MAX6367LKA31+ is a push-pull active-high output that asserts high exclusively when the device is in battery-backup mode (i.e., when OUT is sourced from BATT). It sinks 3.2mA at 0.4V saturation and sources ~10µA from OUT, enabling direct LED indication or base drive for external pass transistors without external components.
Can MAX6367LKA31+ operate with a 1.8V main supply?
Yes, MAX6367LKA31+ operates from VCC as low as 1.2V, making it fully compatible with 1.8V systems. However, its 3.08V reset threshold means it will assert reset continuously when powered from 1.8V - it is intended for use with 3.3V or higher supplies. For 1.8V systems, a different suffix (e.g., KA23 for 2.32V) would be required.
How does the chip-enable gating work on MAX6367LKA31+?
MAX6367LKA31+ provides chip-enable gating through CE IN and CE OUT pins: during normal operation, CE IN passes directly to CE OUT with 1.5ns propagation delay; when reset asserts, CE OUT is held low for 12µs to complete ongoing memory access, then actively pulled high to OUT - preventing erroneous writes to SRAM during power faults.
MAX6367LKA31+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6367LKA31+ FAQ
1.How can I place an order for MAX6367LKA31+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6367LKA31+ 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 MAX6367LKA31+ reliable?
The price and inventory of MAX6367LKA31+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6367LKA31+ is usually 5 days.
3.What payment methods are accepted for MAX6367LKA31+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6367LKA31+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6367LKA31+?
MAX6367LKA31+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6367LKA31+ 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 MAX6367LKA31+?
For technical support, including MAX6367LKA31+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6367LKA31+ requirements.
6.How does Aetrix verify that MAX6367LKA31+ is sourced from the original manufacturer or authorized distributors?
All MAX6367LKA31+ 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 MAX6367LKA31+ meets industry standards.
7.What is the process for return or replacement of MAX6367LKA31+?
All MAX6367LKA31+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6367LKA31+, 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 MAX6367LKA31+ part is unused and in its original packaging.
Return procedure for MAX6367LKA31+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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