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Analog Devices Inc./Maxim Integrated MAX6367PKA31-T
- Part No.:
- MAX6367PKA31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6367PKA31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:12,180
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Product details
Overview
MAX6367PKA31-T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup control and chip-enable gating, featuring a factory-preset 3.08V reset threshold, active-high BATT ON output, open-drain active-low RESET, and operation down to 1.2V supply voltage. It monitors VCC for power-up/down/brownout, switches CMOS RAM to backup battery when VCC fails, gates CE signals to prevent memory corruption, and indicates battery mode via BATT ON - used in portable POS terminals and industrial controllers requiring reliable nonvolatile memory retention.
For engineers reviewing the MAX6367PKA31-T datasheet, MAX6367PKA31-T pinout, MAX6367PKA31-T application, or MAX6367PKA31-T equivalent, key selection criteria include its 3.08V reset threshold tolerance (±0.07V), 150ms minimum reset timeout, 10µA quiescent current, BATT ON push-pull output capability, and SOT23-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6367PKA31-T implements a precision voltage monitor with internal 3.08V reset threshold (±0.07V over temperature), a dedicated BATT ON push-pull output that asserts high only during battery-backup mode, and a VCC-to-BATT switchover circuit with 40mV hysteresis to prevent oscillation during slow VCC decay. Its chip-enable gating uses a transmission gate with 1.5ns propagation delay and 20–100Ω on-resistance, enabling direct interface with high-speed µP address decoders.
It operates across -40°C to +85°C with guaranteed RESET/RESET validity down to 1.2V (VCC or VBATT), supports 5.5V absolute max VCC/BATT, and delivers up to 150mA from VCC or 20mA from battery via OUT while maintaining <1µA battery standby current when VCC > VBATT + 0.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (min 3.00V, max 3.15V) - ensures reliable reset assertion before 3.3V system brownout. |
| Reset Timeout Period | 150ms min - guarantees µP initialization completes before release from reset. |
| Quiescent Supply Current | 10µA typical at VCC = 5.5V - enables multi-year battery life in always-on backup applications. |
| BATT ON Output Type | Push-pull active-high - 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. |
| Package | 8-pin SOT23 - 2.9mm × 1.6mm footprint for ultra-compact PCB layouts. |
| CE IN to CE OUT Delay | 1.5ns - preserves timing integrity for µP address/data strobes up to 100MHz. |
Pinout & Package
MAX6367PKA31-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm, 0.95mm height) with gull-wing leads, RoHS-compliant and available in tape-and-reel (2500 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC brownout, manual reset, or watchdog timeout; requires external pull-up for system reset line. |
| 2 CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write access during power fault. |
| 3 GND | Ground reference | Common return path for VCC, BATT, and all internal circuits; must be low-impedance. |
| 4 BATT ON | Battery-on status indicator | Push-pull high-output during battery-backup mode; sinks 3.2mA at 0.4V saturation. |
| 5 VCC | Main supply input | Powers device and supplies OUT during normal operation; monitored for reset condition. |
| 6 OUT | Power output to SRAM | Sources from VCC (≤150mA) or BATT (≤20mA); auto-switches based on VCC/VBATT comparison. |
| 7 BATT | Backup battery input | Accepts 2.0V–5.5V; activates OUT sourcing when VCC falls below VTH and VBATT > VCC + 20mV. |
| 8 CE OUT | Gated chip-enable output | Passes CE IN when reset inactive; held low for 12µs after reset assertion to complete memory access. |
Key Features
| Feature | Design Value |
|---|---|
| Battery-on output | Push-pull BATT ON provides immediate visual or logic-level indication of backup mode without external components. |
| Chip-enable gating | 1.5ns propagation delay and <100Ω on-resistance enable direct connection to high-speed µP address buses. |
| Low-voltage operation | 1.2V minimum VCC/VBATT support allows use with single-cell LiFePO₄ or NiMH batteries. |
| Reset threshold accuracy | ±2.3% over temperature (3.00V–3.15V at 3.08V nominal) ensures predictable brownout response in 3.3V systems. |
| Transient immunity | Withstands 100mV VCC glitches up to 30µs duration without false reset - reduces need for excessive input filtering. |
Applications
| Portable POS Terminals | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-backed SRAM retains transaction logs and configuration data during AC power loss or battery swap in handheld payment devices. IC Role / Device Role / Timing Role: MAX6367PKA31-T monitors 3.3V rail, switches SRAM to coin-cell backup, gates CE to freeze writes, and asserts BATT ON to trigger firmware save routines. Use Value: Prevents data corruption during 200ms–500ms brownout windows; eliminates need for external MOSFET switch and comparator circuitry. | Use Scenario: Programmable logic controllers retain I/O state and ladder logic variables during factory floor power dips. IC Role / Device Role / Timing Role: MAX6367PKA31-T supervises 5V system rail, enables seamless VCC-to-BATT switchover, and holds CE low during reset to block spurious writes to EEPROM-mapped registers. Use Value: Guarantees 150ms reset hold time for deterministic µP restart; BATT ON output drives optocoupler to isolate backup status from noisy 24V DC field bus. |
| Set-Top Box Memory Backup | Fax Machine Real-Time Clock Hold |
Use Scenario: Consumer STBs preserve channel lineup, parental controls, and EPG data across unplanned outages using onboard SRAM. IC Role / Device Role / Timing Role: MAX6367PKA31-T detects 3.3V rail collapse, routes backup power to 32kB SRAM, blocks CE during fault, and lights BATT ON LED for service diagnostics. Use Value: Reduces bill-of-materials by integrating reset, switchover, and CE gating - replaces discrete supervisor + analog switch + level shifter. | Use Scenario: Legacy fax machines maintain real-time clock and dialing history during AC adapter disconnection or failure. IC Role / Device Role / Timing Role: MAX6367PKA31-T monitors 5V supply, powers RTC/SRAM from 3V lithium battery, asserts BATT ON to disable main processor clocks, and gates CE to halt memory access. Use Value: Enables >10-year RTC hold time with <1µA battery drain in standby; eliminates risk of clock drift during 100ms–1s power interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367HKA31-T | Same 3.08V reset threshold and BATT ON function, but push-pull active-high RESET output instead of open-drain. | Requires no external pull-up on RESET line; better suited for driving multiple loads or interfacing with µPs lacking internal pull-ups. | Select when system RESET net has high capacitive load or when active-high reset polarity is required by µP. |
| TPS3808G33DBVR | 3.3V reset threshold (fixed), 350ms timeout, 2.5µA IQ, no BATT ON or CE gating - only basic reset supervision. | Lacks battery switchover, CE gating, and BATT ON indicator; suitable only for simple reset-only applications. | Select only if battery backup and memory protection are unnecessary and lower quiescent current is critical. |
Compared with MAX6367PKA31-T, MAX6367HKA31-T offers identical supervision and battery functions but simplifies RESET interface with push-pull drive, while TPS3808G33DBVR reduces cost and IQ but removes all backup-control features - making it unsuitable for SRAM-retention designs.
Availability
MAX6367PKA31-T is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLC controllers, set-top box memory backup, and fax machine real-time clock hold applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX6367PKA31-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, sensing, and connectivity in demanding industrial and embedded environments.
The MAX6365–MAX6368 family was engineered specifically for µP systems needing integrated power monitoring, battery-switchover, and memory write protection - targeting space-constrained, battery-sensitive applications like portable instrumentation and edge controllers.
FAQ
What is the exact reset threshold voltage of the MAX6367PKA31-T?
The MAX6367PKA31-T has a factory-trimmed reset threshold of 3.08V, with guaranteed limits of 3.00V (minimum) and 3.15V (maximum) across -40°C to +85°C. This value is confirmed in the Reset Threshold Ranges table and Electrical Characteristics section of the official datasheet, and applies specifically to the "KA31" suffix variant of the MAX6367 series.
Does the MAX6367PKA31-T provide battery backup switching functionality?
Yes, the MAX6367PKA31-T provides automatic VCC-to-BATT switchover when VCC falls below the 3.08V reset threshold and VBATT exceeds VCC by at least 20mV. During this mode, OUT is sourced from the battery, and the BATT ON output asserts high to indicate backup activation - a core function documented in the General Description and Detailed Description sections.
What is the purpose of the BATT ON pin on the MAX6367PKA31-T?
The BATT ON pin on the MAX6367PKA31-T is a push-pull active-high output that asserts high exclusively during battery-backup mode. It sinks 3.2mA at 0.4V saturation and can directly drive LEDs, optocouplers, or base/gate inputs of external pass transistors - eliminating need for external logic or level-shifting components per the Applications Information section.
Can the MAX6367PKA31-T be used without a backup battery?
Yes, the MAX6367PKA31-T operates without a backup battery: connect BATT to GND and tie OUT to VCC. In this configuration, it retains full reset supervision, CE gating, and BATT ON functionality (though BATT ON remains low). This usage is explicitly supported in the Applications Information section under "Operation Without a Backup Power Source."
What package type and dimensions does the MAX6367PKA31-T use?
The MAX6367PKA31-T uses an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 0.95mm, with gull-wing leads and RoHS compliance. This is confirmed in the Pin Configurations diagram, Ordering Information table, and Absolute Maximum Ratings section - and is consistent across all MAX6365–MAX6368 variants.
MAX6367PKA31-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:
- 3.08V
- 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
MAX6367PKA31-T FAQ
1.How can I place an order for MAX6367PKA31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6367PKA31-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 MAX6367PKA31-T reliable?
The price and inventory of MAX6367PKA31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6367PKA31-T is usually 5 days.
3.What payment methods are accepted for MAX6367PKA31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6367PKA31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6367PKA31-T?
MAX6367PKA31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6367PKA31-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 MAX6367PKA31-T?
For technical support, including MAX6367PKA31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6367PKA31-T requirements.
6.How does Aetrix verify that MAX6367PKA31-T is sourced from the original manufacturer or authorized distributors?
All MAX6367PKA31-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 MAX6367PKA31-T meets industry standards.
7.What is the process for return or replacement of MAX6367PKA31-T?
All MAX6367PKA31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6367PKA31-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 MAX6367PKA31-T part is unused and in its original packaging.
Return procedure for MAX6367PKA31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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