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Analog Devices Inc./Maxim Integrated MAX6368PKA23+T
- Part No.:
- MAX6368PKA23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368PKA23+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,050
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Product details
Overview
MAX6368PKA23+T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, battery backup switchover, and chip-enable gating. It operates from 1.2V to 5.5V, features a factory-preset 2.32V reset threshold (±0.06V), 150ms minimum reset timeout, and guarantees RESET assertion down to 1.2V supply. It is used in portable equipment requiring reliable power-fail detection and SRAM data retention during main supply brownout.
For engineers reviewing the MAX6368PKA23+T datasheet, MAX6368PKA23+T pinout, MAX6368PKA23+T application, or MAX6368PKA23+T equivalent, key selection criteria include its dedicated RESET IN comparator (1.235V threshold), open-drain active-low RESET output, SOT23-8 package compatibility, and support for battery-backed CMOS RAM write protection in space-constrained embedded systems.
Technical Context
The MAX6368PKA23+T integrates a precision voltage monitor, a user-configurable reset input comparator referenced to 1.235V, and a bidirectional VCC/BATT switchover MOSFET with 40mV hysteresis. Its CE IN-to-CE OUT transmission gate provides 1.5ns propagation delay and 20–100Ω on-resistance, enabling real-time chip-enable gating during power faults.
It delivers battery-backup operation with <3µA quiescent current in backup mode, supports up to 150mA VCC-sourced output current, and maintains guaranteed RESET/RESET functionality even when VCC or VBATT drops to 1.2V - critical for ultra-low-voltage portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.32V (typ), ±0.06V tolerance - ensures reliable power-up/down detection for +2.5V logic rails |
| RESET Output Type | Open-drain active-low - enables wired-OR reset bus configuration and level-shifting flexibility |
| RESET Timeout Period | 150ms (min) - meets µP reset hold-time requirements across industrial temperature range |
| Operating Supply Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| Quiescent Current | 10µA (typ) at VCC > VTH - extends battery life in always-on monitoring applications |
| RESET IN Threshold | 1.235V (typ), ±50mV over temperature - enables precise secondary supply undervoltage detection |
| VCC-to-OUT On-Resistance | 4.6Ω (max) at VCC = 2.38V, IOUT = 25mA - minimizes dropout and thermal rise in high-current SRAM supply paths |
Pinout & Package
MAX6368PKA23+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Asserts low during VCC brownout, RESET IN undervoltage, or after reset timeout expiration; requires external pull-up |
| 2 - CE IN | Chip-enable input | Controls CE OUT gating path; low disables CE signal to prevent erroneous RAM writes during power fault |
| 3 - GND | Ground reference | Common return for all internal circuits and output drivers; must be low-impedance connection |
| 4 - RESET IN | User-adjustable reset input | Compares against internal 1.235V reference; falling edge below threshold triggers reset assertion |
| 5 - VCC | Main supply input | Powers device and sources OUT during normal operation; monitored for reset generation |
| 6 - OUT | Switched output | Sources from VCC when active; automatically switches to BATT during brownout (≥20mV hysteresis) |
| 7 - BATT | Backup battery input | Provides backup power to OUT when VCC falls below reset threshold and VBATT > VCC + 20mV |
| 8 - CE OUT | Chip-enable output | Passes CE IN signal only when reset is deasserted; held low for 12µs if CE IN is low during reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESET IN comparator | 1.235V internal reference with ±50mV accuracy enables programmable secondary supply monitoring via external resistor divider |
| Battery switchover control | Automatic VCC/BATT switching with 40mV hysteresis prevents oscillation during slow VCC decay |
| Chip-enable gating | 1.5ns propagation delay and <100Ω on-resistance allow use with high-speed µPs and DSPs without timing violation |
| Low-voltage operation | Guaranteed function down to 1.2V VCC or VBATT - supports single-cell LiFePO₄ and energy-harvesting systems |
| Ultra-low backup current | 3µA max IBACK at TA = –40°C to +85°C - preserves coin-cell life for >10 years in standby |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG monitor retains real-time waveform buffer during AC power loss. IC Role / Device Role / Timing Role: Supervisory circuit asserts RESET to halt µP execution and gates CE to freeze SRAM writes while switching OUT to backup battery. Use Value: Prevents data corruption and ensures deterministic restart upon power recovery with no firmware intervention. |
Use Scenario: Remote environmental sensor node logs temperature/humidity hourly using flash memory. IC Role / Device Role / Timing Role: MAX6368PKA23+T monitors both main 3.3V rail and backup 3.0V supercapacitor; RESET IN detects capacitor sag before full discharge. Use Value: Enables graceful shutdown and last-value save with 150ms guaranteed reset hold time. |
| POS Terminal Backup | Smart Meter Real-Time Clock |
Use Scenario: Retail point-of-sale terminal maintains transaction journal integrity during brief grid outage. IC Role / Device Role / Timing Role: CE gating blocks spurious writes to EEPROM during VCC dip; OUT supplies SRAM from coin cell. Use Value: Eliminates need for external logic or discrete MOSFETs - reduces BOM count and layout area by 30%. |
Use Scenario: Electricity meter retains accurate timekeeping and tariff data during extended mains failure. IC Role / Device Role / Timing Role: MAX6368PKA23+T uses RESET IN to monitor RTC backup supply; BATT powers RTC and SRAM via OUT. Use Value: Achieves <3µA backup current, extending CR2032 life beyond 10 years per IEC 62056 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368HKA23+T | Same core functions, but push-pull active-high RESET output instead of open-drain active-low | Requires redesign of reset bus termination; incompatible with shared-reset architectures needing wired-OR | Select when system demands active-high reset signaling and no bus sharing is required |
| TPS3808G125DBVR | Lower quiescent current (1.1µA), fixed 1.25V reset threshold, no RESET IN or CE gating | Lacks auxiliary reset input and chip-enable protection - unsuitable for SRAM write-protection-critical designs | Choose only for simple voltage monitoring where CE gating and dual-supply switchover are unnecessary |
Compared with MAX6368HKA23+T, the MAX6368PKA23+T offers superior flexibility in reset bus topology; compared with TPS3808G125DBVR, it delivers essential battery switchover and CE gating for data-integrity-critical applications - making it irreplaceable in portable memory-retention systems.
Availability
MAX6368PKA23+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, POS terminals, and smart meters requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6368PKA23+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 interface applications in demanding industrial and portable environments.
The MAX6365–MAX6368 family was engineered specifically for microprocessor systems needing integrated power supervision, battery backup, and hardware-enforced memory write protection - targeting space- and power-constrained embedded devices.
FAQ
What is the exact reset threshold voltage of the MAX6368PKA23+T?
The MAX6368PKA23+T has a factory-trimmed reset threshold of 2.32V (typical), with a guaranteed range of 2.25V to 2.38V across –40°C to +85°C. This value is fixed per the "23" suffix in the part number and applies to the primary VCC monitoring function - not the auxiliary RESET IN input, which uses a separate 1.235V internal reference.
Does the MAX6368PKA23+T support battery backup for CMOS RAM?
Yes, the MAX6368PKA23+T directly supports battery-backed CMOS RAM via its OUT pin, which automatically switches from VCC to BATT when VCC falls below the reset threshold and VBATT exceeds VCC by ≥20mV. In backup mode, it delivers up to 20mA from the battery while consuming only 3µA quiescent current - preserving coin-cell life for multi-year operation.
How does the RESET IN pin function on the MAX6368PKA23+T?
The RESET IN pin on the MAX6368PKA23+T connects to an internal comparator referenced to 1.235V. When the voltage at RESET IN falls below this threshold, the device asserts RESET. The input leakage is ±25nA (max), allowing high-impedance resistor-divider programming for custom undervoltage detection - e.g., monitoring a 5V rail with a 4.60V trip point using R1 = 273kΩ and R2 = 100kΩ.
What is the purpose of CE IN and CE OUT on the MAX6368PKA23+T?
CE IN and CE OUT implement hardware-enforced chip-enable gating: during normal operation, CE IN passes through to CE OUT with 1.5ns delay; when RESET is asserted, the path is disabled to prevent spurious memory writes. If CE IN is low during reset, CE OUT remains low for 12µs to complete ongoing read/write cycles - ensuring data integrity in SRAM-based systems powered by MAX6368PKA23+T.
Is the MAX6368PKA23+T compatible with 1.2V logic systems?
Yes, the MAX6368PKA23+T is fully functional at VCC = 1.2V: RESET/RESET outputs remain valid, the 2.32V reset threshold detector operates correctly, and CE gating maintains <100Ω on-resistance. Its guaranteed 1.2V operation enables use in ultra-low-power applications such as energy-harvesting sensors and single-cell LiFePO₄ systems - unlike most supervisory ICs that require ≥1.8V.
MAX6368PKA23+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- 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
MAX6368PKA23+T FAQ
1.How can I place an order for MAX6368PKA23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368PKA23+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 MAX6368PKA23+T reliable?
The price and inventory of MAX6368PKA23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368PKA23+T is usually 5 days.
3.What payment methods are accepted for MAX6368PKA23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368PKA23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368PKA23+T?
MAX6368PKA23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368PKA23+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 MAX6368PKA23+T?
For technical support, including MAX6368PKA23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368PKA23+T requirements.
6.How does Aetrix verify that MAX6368PKA23+T is sourced from the original manufacturer or authorized distributors?
All MAX6368PKA23+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 MAX6368PKA23+T meets industry standards.
7.What is the process for return or replacement of MAX6368PKA23+T?
All MAX6368PKA23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368PKA23+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 MAX6368PKA23+T part is unused and in its original packaging.
Return procedure for MAX6368PKA23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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