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Analog Devices Inc./Maxim Integrated MAX6368PKA44+T
- Part No.:
- MAX6368PKA44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368PKA44+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:17,500
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Product details
Overview
MAX6368PKA44+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 4.38V reset threshold (±0.13V), 150ms minimum reset timeout, 10µA quiescent current, and supports CMOS RAM protection in portable and industrial µP systems.
For engineers reviewing the MAX6368PKA44+T datasheet, MAX6368PKA44+T pinout, MAX6368PKA44+T application, or MAX6368PKA44+T equivalent, key selection criteria include its adjustable RESET IN comparator (1.235V reference), open-drain active-low RESET output, SOT23-8 package compatibility, and guaranteed RESET/RESET operation down to 1.2V supply.
Technical Context
The MAX6368PKA44+T integrates a precision voltage monitor for VCC (4.38V threshold), an independent RESET IN comparator referenced to 1.235V, and a bidirectional battery switchover path between VCC and BATT with 40mV hysteresis. Its CE IN-to-CE OUT transmission gate provides 1.5ns propagation delay and 20–100Ω on-resistance during normal operation.
Reset assertion occurs under three conditions: VCC falling below 4.38V, RESET IN falling below 1.235V, or manual intervention via external circuitry. The device guarantees reset deassertion only after VCC rises above threshold and remains stable for ≥150ms, with internal glitch immunity up to 100ns at 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (typ), ±0.13V over -40°C to +85°C - sets precise power-fail detection point for +5V or +3.3V rails |
| RESET Output Type | Open-drain active-low - enables wired-OR configuration and level-shifting with external pull-up |
| RESET Timeout Period | 150ms (min) - ensures µP completes full power-up initialization before release |
| Quiescent Current | 10µA (typ) at VCC = 5.5V - enables multi-year battery life in backup mode |
| RESET IN Threshold | 1.235V (typ), ±50mV - allows accurate secondary supply monitoring via external resistor divider |
| VCC Operating Range | 1.2V to 5.5V - supports ultra-low-voltage logic and legacy 5V systems without external regulators |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC brownout transitions |
Pinout & Package
MAX6368PKA44+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Asserts low continuously during VCC undervoltage or RESET IN fault; requires external pull-up for logic-level definition |
| 2 - CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write access during power faults |
| 3 - GND | Ground reference | Primary return path for VCC, BATT, and internal logic; must be low-impedance for noise immunity |
| 4 - RESET IN | Auxiliary reset input | Compares against 1.235V internal reference; falling edge below threshold triggers system reset |
| 5 - VCC | Main supply input | Powers internal circuitry and sources OUT during normal operation; monitored for 4.38V threshold violation |
| 6 - OUT | Switched output | Sources from VCC when active; switches to BATT during brownout (if VBATT > VCC + 20mV) |
| 7 - BATT | Backup battery input | Provides hold-up power to SRAM during main supply failure; draws <1µA standby current at VBATT = 2.8V |
| 8 - CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs after reset assertion to complete memory access |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable RESET IN | 1.235V precision reference enables programmable secondary supply monitoring (e.g., 4.60V via R1/R2 divider) |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance prevent SRAM corruption during power transients |
| Battery switchover control | Automatic VCC/BATT switching with 40mV hysteresis eliminates need for external MOSFET drivers |
| Ultra-low supply current | 10µA typical ICC and 3µA IBACK ensure minimal drain on backup batteries during extended outages |
| Reset timing guarantee | 150ms minimum timeout and 20µs VCC-falling delay ensure robust µP initialization across temperature |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered ECG or glucose meters requiring data retention during AC power loss. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and monitors backup coin-cell voltage; asserts RESET IN when secondary 2.5V analog supply drops. Use Value: Prevents SRAM corruption during switchover and guarantees 150ms reset hold time for safe state save before shutdown. |
Use Scenario: DIN-rail mounted controllers operating in harsh environments with fluctuating 24V DC input. IC Role / Device Role / Timing Role: Monitors regulated 5V system rail and provides CE gating to isolate EEPROM writes during brownout. Use Value: Eliminates need for discrete MOSFET + RC timing circuits while maintaining <1.5ns CE propagation for real-time I/O updates. |
| Point-of-Sale Terminals | Set-Top Box Firmware Recovery |
|
Use Scenario: Credit card readers with flash-based firmware that must survive sudden power interruption. IC Role / Device Role / Timing Role: Uses RESET IN to detect 1.8V core rail collapse; gates CE to halt flash programming mid-write. Use Value: Ensures atomic firmware update integrity by disabling write access within 1.5ns of fault detection. |
Use Scenario: Consumer STBs requiring fail-safe boot recovery after corrupted OTA updates. IC Role / Device Role / Timing Role: Supervises 3.3V AVDD rail and uses open-drain RESET to trigger bootloader watchdog reset sequence. Use Value: Guarantees 150ms minimum reset pulse width even at 1.2V VCC, enabling reliable recovery on low-VDD SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367PKA44+T | Includes BATT ON push-pull indicator output instead of RESET IN; same 4.38V VTH and SOT23-8 package | Used where visual/LED battery-backup status is required rather than secondary supply monitoring | Select when system needs hardware confirmation of switchover, not auxiliary reset triggering |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no battery switchover or CE gating; 350ms timeout, 2.5µA IQ | Targeted at simple power-on reset only - lacks MAX6368PKA44+T's dual-supply supervision and memory protection | Choose for cost-sensitive designs needing basic reset without backup or SRAM gating functionality |
Compared with MAX6367PKA44+T, MAX6368PKA44+T trades BATT ON indication for programmable RESET IN monitoring, enabling secondary rail supervision; versus TPS3808G33DBVR, it adds battery switchover, CE gating, and adjustable reset input at higher quiescent current but broader functional scope.
Availability
MAX6368PKA44+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6368PKA44+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 industrial, automotive, and computing markets.
The MAX6365–MAX6368 family delivers integrated µP supervision with battery backup and chip-enable gating, targeting space- and power-constrained systems requiring reliable power-fail response and SRAM data integrity.
FAQ
What is the exact reset threshold voltage for MAX6368PKA44+T?
The MAX6368PKA44+T has a factory-trimmed reset threshold of 4.38V (typical), with a guaranteed range of 4.25V to 4.50V over the full -40°C to +85°C operating temperature range. This value is fixed per the "KA44" suffix and applies to the primary VCC monitoring function, not the auxiliary RESET IN input.
How does the RESET IN pin on MAX6368PKA44+T function in practice?
The RESET IN pin on MAX6368PKA44+T compares an external voltage against an internal 1.235V reference. When the applied voltage falls below 1.235V (±50mV), the device asserts its open-drain RESET output low. It is commonly used with a resistor divider to monitor secondary supplies like 5V or 2.5V rails.
Does MAX6368PKA44+T support battery backup operation with zero external components?
Yes - MAX6368PKA44+T enables battery backup operation with only a backup battery connected to the BATT pin and the OUT pin wired to SRAM VCC. No external MOSFETs, diodes, or timing capacitors are required; switchover is fully internal and hysteresis-controlled.
What is the purpose of the CE IN and CE OUT pins on MAX6368PKA44+T?
The CE IN and CE OUT pins implement hardware chip-enable gating: CE IN connects to the µP's CE signal, and CE OUT drives the SRAM's CE input. During reset assertion, CE OUT is disabled or held low for 12µs to prevent partial memory writes, ensuring data integrity during power faults.
Can MAX6368PKA44+T operate reliably at 1.2V supply voltage?
Yes - MAX6368PKA44+T guarantees full functionality including RESET/RESET output validity, reset timeout timing, and RESET IN comparator operation down to 1.2V VCC. Its 10µA quiescent current and 1.2V minimum rating make it suitable for ultra-low-voltage energy-harvesting and backup-battery applications.
MAX6368PKA44+T 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
MAX6368PKA44+T FAQ
1.How can I place an order for MAX6368PKA44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368PKA44+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 MAX6368PKA44+T reliable?
The price and inventory of MAX6368PKA44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368PKA44+T is usually 5 days.
3.What payment methods are accepted for MAX6368PKA44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368PKA44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368PKA44+T?
MAX6368PKA44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368PKA44+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 MAX6368PKA44+T?
For technical support, including MAX6368PKA44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368PKA44+T requirements.
6.How does Aetrix verify that MAX6368PKA44+T is sourced from the original manufacturer or authorized distributors?
All MAX6368PKA44+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 MAX6368PKA44+T meets industry standards.
7.What is the process for return or replacement of MAX6368PKA44+T?
All MAX6368PKA44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368PKA44+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 MAX6368PKA44+T part is unused and in its original packaging.
Return procedure for MAX6368PKA44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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