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Analog Devices Inc./Maxim Integrated MAX6367PKA31
- Part No.:
- MAX6367PKA31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6367PKA31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:13,188
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Product details
Overview
MAX6367PKA31 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 (1.2V–5.5V), asserts reset when VCC falls below 3.08V (typ), provides 150ms minimum reset timeout, and switches OUT to backup battery when VCC drops below VBATT by >20mV. It is used in portable equipment requiring nonvolatile memory retention during power failure.
For engineers reviewing the MAX6367PKA31 datasheet, MAX6367PKA31 pinout, MAX6367PKA31 application, or MAX6367PKA31 equivalent, key selection criteria include its 3.08V factory-set reset threshold, active-high push-pull BATT ON output, 8-pin SOT23 package, 10µA quiescent current, and guaranteed reset assertion down to 1.2V VCC or VBATT.
Technical Context
The MAX6367PKA31 integrates a precision voltage monitor, battery switchover MOSFET control, and dedicated BATT ON status output. Its internal comparator compares VCC against a trimmed 3.08V threshold (±1.5% over temperature), and its BATT ON output drives high only when VCC < VTH and VCC < VBATT – confirming true battery-backup mode.
It features a 1.5ns CE IN-to-CE OUT propagation delay for real-time chip-enable gating, on-resistance of 4.6Ω (VCC=2.38V, IOUT=25mA) for low-loss battery switching, and 150ms min reset timeout with immunity to short VCC transients (e.g., 30µs at 100mV overdrive).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (min/typ/max); ensures reliable reset assertion for 3.3V systems experiencing brownout |
| Supply Voltage Range | 1.2V to 5.5V (VCC or VBATT); supports operation from single-cell Li-ion or coin-cell backup sources |
| Quiescent Current | 10µA typ (VCC > VTH); enables multi-year battery life in always-on backup applications |
| Reset Timeout Period | 150ms min; guarantees µP initialization completes before release from reset |
| BATT ON Output Type | Push-pull active-high; sinks 3.2mA at 0.4V saturation, eliminating need for external pull-up |
| VCC-to-OUT On-Resistance | 4.6Ω max (VCC=2.38V, IOUT=25mA); limits voltage drop and power loss during main-supply operation |
| CE IN-to-CE OUT Delay | 1.5ns typ; preserves timing integrity for high-speed µP address/data bus gating |
Pinout & Package
MAX6367PKA31 is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs. Pin numbering follows standard SOT23 top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC brownout, manual reset, or watchdog timeout; requires external pull-down for logic-low default |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low disables write path during reset to prevent data corruption |
| 3 GND | Ground reference | Common return for all analog/digital functions; must be low-impedance connection to system ground plane |
| 4 BATT ON | Battery-backup status indicator | Drives high only when device is actively sourcing from battery; used for LED indication or external pass transistor enable |
| 5 RESET IN | Not connected / no function | This pin is unused in MAX6367 variant; leave floating or tie to GND per layout best practice |
| 6 VCC | Main supply input | Primary power source (1.2V–5.5V); reset asserts when voltage falls below 3.08V threshold |
| 7 OUT | Regulated output | Supplies CMOS RAM from VCC normally; switches to VBATT during brownout with 40mV hysteresis to prevent chatter |
| 8 BATT | Backup battery input | Accepts 2.0V–5.5V backup source; internal MOSFET connects it to OUT only when VCC < VTH and VCC < VBATT |
Key Features
| Feature | Design Value |
|---|---|
| Battery-On output | Dedicated push-pull BATT ON signal confirms active battery-backup mode without software polling |
| Chip-enable gating | 1.5ns propagation delay and 20Ω on-resistance ensure glitch-free CE signal blocking during reset |
| Precision reset threshold | 3.08V ±1.5% over -40°C to +85°C eliminates need for external resistor divider calibration |
| Low-voltage operation | Guaranteed reset assertion down to 1.2V VCC or VBATT enables use with single-cell LiFePO₄ or NiMH batteries |
| Transient immunity | Withstands 30µs VCC glitches 100mV below threshold, reducing false resets in noisy industrial environments |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Continuous ECG waveform storage during AC power interruption. IC Role / Device Role / Timing Role: Supervisory IC providing battery-backed SRAM power, CE gating to lock memory writes, and BATT ON signal to trigger low-power firmware state. Use Value: Prevents data loss during 100ms–500ms grid dropout; BATT ON enables immediate clock domain switch to RTC and memory preservation logic. |
Use Scenario: Remote sensor node recording temperature/humidity every 10 seconds with mains-powered charging. IC Role / Device Role / Timing Role: Power supervisor managing seamless transition from wall adapter to Li-ion backup, with CE gating to freeze flash writes during switchover. Use Value: Eliminates 150ms reset window-induced data gaps; 10µA quiescent current extends battery-only runtime to >3 years. |
| Retail Point-of-Sale Terminals | Smart Energy Meters |
|
Use Scenario: Transaction rollback protection during sudden power loss during credit card processing. IC Role / Device Role / Timing Role: Real-time memory protector asserting reset and disabling CE within 1.5ns to halt SRAM writes mid-transaction. Use Value: Guarantees atomic transaction commit via hardware-enforced write inhibition, meeting PCI-DSS data integrity requirements. |
Use Scenario: Tamper-proof energy consumption logging during utility grid instability. IC Role / Device Role / Timing Role: Brownout detector triggering BATT ON to activate secure crypto module and switch to backup RTC while freezing metering registers. Use Value: Maintains time-synchronized billing data with <1ppm timing drift during extended outages; 40mV switchover hysteresis prevents oscillation on sagging lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367HKA31 | Same reset threshold (3.08V) and BATT ON function, but offers active-low push-pull RESET output instead of open-drain | Suitable where µP requires active-low reset with drive strength >1mA, not compatible with open-drain wired-OR bus configurations | Select MAX6367HKA31 if system reset net uses push-pull drivers and requires guaranteed low-impedance reset deassertion |
| MAX6366PKA31 | Replaces BATT ON with watchdog timer (1.6s timeout); identical reset threshold, package, and supply specs | Used where software execution monitoring is prioritized over battery-status indication, e.g., embedded controllers with critical task scheduling | Choose MAX6366PKA31 when watchdog supervision is mandatory and BATT ON signal is unnecessary or implemented elsewhere |
Compared with MAX6367PKA31, MAX6367HKA31 provides stronger reset drive but loses open-drain flexibility, while MAX6366PKA31 trades BATT ON for watchdog functionality-neither is pin-compatible, and both require PCB layout revision due to differing RESET output structures.
Availability
MAX6367PKA31 is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, and retail point-of-sale terminals requiring stable component supply across multi-year production cycles.
Supply support for MAX6367PKA31 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 interface applications in industrial, automotive, and computing markets.
The MAX6365–MAX6368 family was engineered to replace discrete reset/battery-switch solutions in space-constrained µP systems, integrating monitoring, switchover, and memory protection in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage of MAX6367PKA31?
The MAX6367PKA31 has a factory-trimmed reset threshold of 3.00V (min), 3.08V (typ), and 3.15V (max) over -40°C to +85°C. This 3.08V nominal value is specifically selected for reliable supervision of 3.3V power rails during brownout conditions, with ±1.5% tolerance ensuring consistent behavior across temperature and unit variance.
Does MAX6367PKA31 support battery backup for both VCC and VBATT voltages below 2.0V?
No. MAX6367PKA31 guarantees operation down to 1.2V on either VCC or VBATT, but battery backup activation requires VBATT > VCC + 20mV and VCC < 3.08V. While VBATT can be as low as 2.0V per Absolute Maximum Ratings, successful switchover depends on sufficient headroom between VBATT and VCC - a 2.0V battery cannot back up a 1.95V VCC rail.
How does the BATT ON output behave during power-up and brownout transitions?
The BATT ON output of MAX6367PKA31 remains low during normal VCC operation and asserts high only when both conditions are met: VCC falls below 3.08V *and* VCC drops below VBATT by >20mV. It stays high throughout battery-backup mode and returns low within 12µs after VCC rises above VBATT + 20mV and exceeds 3.08V.
Can CE IN and CE OUT of MAX6367PKA31 interface directly with 1.8V logic systems?
Yes. MAX6367PKA31's CE IN accepts logic thresholds referenced to VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), and CE OUT drives to VCC or VBATT levels. When VCC = 1.8V, CE IN recognizes >1.26V as high and <0.54V as low, and CE OUT delivers valid 1.8V-level signals - enabling direct connection to 1.8V µPs without level-shifting.
Is the 150ms reset timeout period of MAX6367PKA31 adjustable or fixed?
The 150ms minimum reset timeout period (tRP) of MAX6367PKA31 is fixed and unadjustable. It is internally generated and guaranteed over temperature and supply voltage. The actual timeout is typically 200–280ms, but design must rely on the 150ms minimum to ensure µP initialization completes before reset release.
MAX6367PKA31 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 FAQ
1.How can I place an order for MAX6367PKA31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6367PKA31 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 reliable?
The price and inventory of MAX6367PKA31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6367PKA31 is usually 5 days.
3.What payment methods are accepted for MAX6367PKA31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6367PKA31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6367PKA31?
MAX6367PKA31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6367PKA31 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?
For technical support, including MAX6367PKA31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6367PKA31 requirements.
6.How does Aetrix verify that MAX6367PKA31 is sourced from the original manufacturer or authorized distributors?
All MAX6367PKA31 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 meets industry standards.
7.What is the process for return or replacement of MAX6367PKA31?
All MAX6367PKA31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6367PKA31, 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 part is unused and in its original packaging.
Return procedure for MAX6367PKA31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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