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Analog Devices Inc./Maxim Integrated MAX6368PKA31+T
- Part No.:
- MAX6368PKA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368PKA31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,285
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Product details
Overview
The MAX6368PKA31+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 monitors VCC supply (1.2V–5.5V), asserts active-low open-drain RESET when VCC falls below 3.08V (typ), provides 1.235V reference-based RESET IN threshold, delivers ≤10µA quiescent current, and operates in -40°C to +85°C for use in portable equipment requiring reliable power-fail detection and SRAM data retention.
For engineers reviewing the MAX6368PKA31+T datasheet, MAX6368PKA31+T pinout, MAX6368PKA31+T application, or MAX6368PKA31+T equivalent, this page delivers verified functional identity, confirmed SOT23-8 package mapping, validated pin roles including RESET IN and CE IN/OUT, exact reset timeout (150ms min), and two technically documented alternative parts for secondary-supply monitoring applications.
Technical Context
The MAX6368PKA31+T integrates a precision voltage comparator for RESET IN (1.235V ±50mV reference), a VCC brownout detector with factory-trimmed 3.08V threshold (±70mV over temperature), and a bidirectional transmission gate for CE IN-to-CE OUT signal gating with 1.5ns propagation delay and <100Ω on-resistance. Its battery switchover logic enforces dual conditions: VCC must be both below VTH and at least 20mV below VBATT before connecting BATT to OUT.
RESET output is open-drain active-low, guaranteed functional down to 1.2V VCC or VBATT, with 150ms minimum timeout period and 20µs VCC-falling delay. The device uses internal MOSFET switching for VCC/BATT selection and actively pulls CE OUT to OUT during reset disable, ensuring CMOS RAM write protection during power faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 3.00V to 3.15V - factory-set trip point for VCC brownout detection; ensures reliable µP reset at 3.3V system rail margin. |
| RESET IN Threshold (VRTH) | 1.185V to 1.285V - internal 1.235V reference enables external resistor-divider programming of secondary supply reset points. |
| Quiescent Supply Current | 10µA max at VCC = 5.5V - enables multi-year battery backup operation without significant drain on coin-cell sources. |
| Reset Timeout Period (tRP) | 150ms to 280ms - guarantees sufficient µP initialization time after power recovery before release of reset state. |
| VCC-to-OUT On-Resistance | 4.6Ω at VCC = 2.38V, IOUT = 25mA - supports up to 150mA load from main supply with minimal dropout. |
| CE IN to CE OUT Propagation Delay | 2ns to 9ns - allows compatibility with high-speed µPs and DSPs while maintaining deterministic write-protection timing. |
| Battery Backup Current (IBACK) | 3µA max at VBATT = 2.8V, VCC = 0V - preserves backup battery life during extended power-loss events. |
Pinout & Package
MAX6368PKA31+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead(Pb)-free, RoHS-compliant, with thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC brownout, RESET IN undervoltage, or power-up; requires external pullup for logic-high level. |
| 2 CE IN | Chip-enable input | Directly gates CE signal path to CMOS RAM; low disables write access during fault conditions. |
| 3 GND | Ground reference | Primary return path for all internal circuits and output loads; must be low-impedance connection. |
| 4 RESET IN | Auxiliary reset input | Compares external voltage against 1.235V reference; falling edge below threshold triggers system reset. |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and supplies OUT during normal operation. |
| 6 OUT | Regulated output | Sources from VCC (≤150mA) or BATT (≤40mA) depending on switchover logic; powers SRAM or real-time clock. |
| 7 BATT | Backup battery input | Connects to coin cell or supercap; activates only when VCC < VTH and VCC < VBATT – 20mV. |
| 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 |
|---|---|
| User-adjustable RESET IN | 1.235V internal reference enables precise secondary supply monitoring via external resistor divider (e.g., 4.60V trip with R1=273kΩ, R2=100kΩ). |
| Chip-enable gating | 1.5ns propagation delay and <100Ω on-resistance ensure transparent CE signal routing during operation and immediate disable during reset. |
| Battery switchover hysteresis | 40mV total hysteresis (20mV up/down) prevents oscillation during slow VCC ramp-down or noisy backup transitions. |
| Low-voltage operation | Guaranteed RESET/RESET functionality down to 1.2V VCC or VBATT enables use with ultra-low-power 1.8V/1.2V µP systems. |
| Power-supply transient immunity | Withstands negative-going VCC transients up to 30µs at 100mV overdrive without false reset-validated per Typical Operating Characteristics graph. |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered ECG monitor retains real-time waveform buffer and clock during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC asserts RESET to halt µP execution, switches SRAM to BATT, and gates CE to prevent corrupted memory writes. Use Value: Ensures zero-data-loss operation during 100ms–5s brownouts using standard CR2032 coin cell with ≤3µA backup current draw. |
Use Scenario: Factory-floor PLC maintains I/O state and configuration registers during 24VDC supply dips caused by motor startup. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail; triggers reset if voltage drops below 3.08V and simultaneously isolates memory bus via CE gating. Use Value: Prevents spurious relay actuation or sensor misreads by enforcing 150ms minimum reset hold time and deterministic CE disable timing. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Retail terminal preserves transaction log and secure key storage during brief UPS switchover delays. IC Role / Device Role / Timing Role: Uses RESET IN to monitor isolated 5V analog supply; asserts system reset if secondary rail fails independently of main 3.3V rail. Use Value: Enables dual-rail fault detection-prevents corrupted sales records by triggering reset on either primary or auxiliary supply failure. |
Use Scenario: Utility meter retains time-of-use billing data and tamper logs during grid outages lasting hours. IC Role / Device Role / Timing Role: Provides battery-backed SRAM power via BATT-to-OUT MOSFET switch and blocks memory writes via CE gating during brownout. Use Value: Achieves >10-year backup lifetime with 2.8V lithium thionyl chloride cell due to 3µA IBACK and 1.2V operational floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367PKA31+T | Replaces RESET IN with BATT ON push-pull output; identical VTH, tRP, and package. | Used where battery-backup status indication (e.g., LED driver or external pass transistor enable) is required instead of secondary supply monitoring. | Select when system needs visual or control-signal feedback of battery mode rather than programmable reset input. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no battery switchover or CE gating; 350ms timeout, 2.5µA IQ. | Applicable only for basic VCC monitoring without backup power management or memory protection features. | Choose only for cost-sensitive, single-rail applications lacking battery backup or SRAM write protection requirements. |
Compared with MAX6368PKA31+T, MAX6367PKA31+T adds BATT ON signaling but removes RESET IN flexibility, while TPS3808G33DBVR reduces feature set to basic reset generation-making MAX6368PKA31+T uniquely suited for dual-supply monitoring with integrated memory safety.
Availability
MAX6368PKA31+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, point-of-sale terminals, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed lead(Pb)-free compliance.
Supply support for MAX6368PKA31+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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated power supervision, battery backup, and memory write protection-replacing discrete reset + switch + gating solutions with a single 8-pin SOT23 device.
FAQ
What is the exact reset threshold voltage for MAX6368PKA31+T?
The MAX6368PKA31+T has a factory-trimmed reset threshold (VTH) of 3.00V (min), 3.08V (typ), and 3.15V (max) at TA = +25°C, with ±70mV variation over -40°C to +85°C. This value is laser-trimmed during production and applies specifically to the VCC supply monitoring function-not the RESET IN input, which uses a separate 1.235V reference.
How does the RESET IN pin function on MAX6368PKA31+T?
The RESET IN pin on MAX6368PKA31+T compares an external voltage against an internal 1.235V reference. When the applied voltage falls below 1.185V (min), the device asserts active-low RESET. The input leakage is ±25nA max, enabling high-impedance resistor-divider networks-for example, R1 = 273kΩ and R2 = 100kΩ sets a 4.60V trip point for a secondary 5V supply.
What package type and dimensions does MAX6368PKA31+T use?
MAX6368PKA31+T uses an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. It is lead(Pb)-free, RoHS-compliant, and marked "AACR" per Maxim's Device Marking Codes table. The thermal pad is not internally connected, and no heatsinking is required for its 10µA typical supply current.
Can MAX6368PKA31+T operate with a 1.2V supply?
Yes, MAX6368PKA31+T is fully specified to operate with VCC or VBATT as low as 1.2V. Its RESET and RESET outputs remain functional at this voltage, and the internal 1.235V reference for RESET IN remains accurate. This enables direct integration into modern ultra-low-power 1.2V/1.8V microcontroller systems without level-shifting.
Does MAX6368PKA31+T provide chip-enable gating, and how does it work?
Yes, MAX6368PKA31+T provides chip-enable gating via CE IN and CE OUT pins. During normal operation, CE IN passes directly to CE OUT with 1.5ns propagation delay and <100Ω on-resistance. When RESET asserts, CE OUT is immediately disabled and held low for 12µs to complete any pending memory access before full isolation.
MAX6368PKA31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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
MAX6368PKA31+T FAQ
1.How can I place an order for MAX6368PKA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368PKA31+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 MAX6368PKA31+T reliable?
The price and inventory of MAX6368PKA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368PKA31+T is usually 5 days.
3.What payment methods are accepted for MAX6368PKA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368PKA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368PKA31+T?
MAX6368PKA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368PKA31+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 MAX6368PKA31+T?
For technical support, including MAX6368PKA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368PKA31+T requirements.
6.How does Aetrix verify that MAX6368PKA31+T is sourced from the original manufacturer or authorized distributors?
All MAX6368PKA31+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 MAX6368PKA31+T meets industry standards.
7.What is the process for return or replacement of MAX6368PKA31+T?
All MAX6368PKA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368PKA31+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 MAX6368PKA31+T part is unused and in its original packaging.
Return procedure for MAX6368PKA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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