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Analog Devices Inc./Maxim Integrated MAX6368PKA29-T
- Part No.:
- MAX6368PKA29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368PKA29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
The MAX6368PKA29-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 2.93V reset threshold (±70mV), delivers 150ms minimum reset timeout, and consumes only 10µA quiescent current. It supports critical power monitoring in portable microprocessor systems requiring reliable brownout detection and nonvolatile memory protection.
For engineers reviewing the MAX6368PKA29-T datasheet, MAX6368PKA29-T pinout, MAX6368PKA29-T application, or MAX6368PKA29-T equivalent, key selection criteria include its 1.235V auxiliary reset comparator threshold, open-drain active-low RESET output, SOT23-8 package compatibility, and integrated VCC-to-BATT switchover with <1µA backup standby current.
Technical Context
The MAX6368PKA29-T implements a precision voltage-monitoring architecture with dual independent reset sources: primary VCC monitoring at 2.93V and secondary RESET IN comparison against a 1.235V internal reference. Its chip-enable gating uses a transmission gate with 1.5ns propagation delay and 20–100Ω on-resistance, enabling real-time CE signal blocking during power faults.
Battery switchover is controlled by a hysteresis-comparator circuit that engages when VCC falls below both the 2.93V threshold and VBATT by ≥20mV, and disengages when VCC rises ≥20mV above VBATT. The device guarantees RESET assertion down to 1.2V supply and maintains functional integrity across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.93V ±0.07V - sets precise brownout detection point for +3.3V or +2.5V logic 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 max at VCC = 5.5V - extends battery life in always-on backup applications |
| RESET IN Threshold | 1.235V ±0.05V - allows accurate secondary supply monitoring via external resistor divider |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| Battery Standby Current | –1.0µA to +0.05µA - near-zero drain preserves backup battery charge during extended outages |
Pinout & Package
MAX6368PKA29-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs. Pin assignments are fully validated per Maxim's official pin configuration diagram for MAX6368.
| 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 | Directly gates CE signal path to SRAM; low disables write access during power fault |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection |
| 4 RESET IN | Auxiliary reset comparator input | Compares against 1.235V reference; falling edge below threshold triggers reset assertion |
| 5 VCC | Main supply input | Powers internal circuitry and supplies OUT during normal operation; monitored for reset generation |
| 6 OUT | Switched output | Sources from VCC normally; switches to BATT during brownout; drives SRAM VDD directly |
| 7 BATT | Backup battery input | Provides hold-up power when VCC fails; enables seamless transition with 40mV hysteresis |
| 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 |
|---|---|
| Auxiliary RESET IN comparator | 1.235V reference enables programmable secondary supply monitoring (e.g., 4.6V rail via R1/R2 divider) |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance prevent SRAM corruption during power transitions |
| VCC-to-BATT switchover | Automatic 40mV hysteresis prevents oscillation during slow VCC decay; OUT sustains up to 150mA from VCC |
| Low-voltage operation | Guaranteed RESET/RESET functionality down to 1.2V supply supports single-cell Li-ion and energy-harvesting systems |
| Ultra-low quiescent current | 10µA typical ICC and <1µA IBACK ensure >10-year coin-cell battery life in backup mode |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitors and ECG patches require persistent RAM retention during intermittent charging cycles and supply dips. IC Role / Device Role / Timing Role: MAX6368PKA29-T monitors main 3.3V rail and auxiliary 1.8V sensor bias supply, asserts RESET to halt MCU execution, and gates CE to lock SRAM during brownout. Use Value: Prevents data corruption during 200ms power interruptions while drawing <1µA from CR2032 backup cell. | Use Scenario: DIN-rail mounted PLC modules operate in harsh environments with fluctuating 24VDC input and need deterministic restart after voltage sags. IC Role / Device Role / Timing Role: MAX6368PKA29-T serves as primary supervisor for ARM Cortex-M7 host, using RESET IN to monitor isolated 5V analog supply and trigger fail-safe shutdown. Use Value: Guarantees 150ms reset hold time and eliminates spurious resets from 100mV/30µs transients on 24V input. |
| Smart Meter Data Loggers | POS Terminal Backup Memory |
Use Scenario: Electricity meters log consumption data to FRAM/EEPROM and must retain state during grid outages lasting minutes to hours. IC Role / Device Role / Timing Role: MAX6368PKA29-T switches SRAM power from 3.3V main rail to 3.0V lithium backup, gates CE to freeze writes, and signals undervoltage via RESET IN on 1.2V RTC supply. Use Value: Enables >5-year backup runtime with <1µA standby current and prevents EEPROM write errors during switchover. | Use Scenario: Retail point-of-sale terminals use battery-backed SRAM to preserve transaction buffers during AC power loss or battery replacement. IC Role / Device Role / Timing Role: MAX6368PKA29-T monitors 5.0V system rail and 3.3V I/O rail simultaneously, asserting RESET and disabling CE within 20µs of VCC drop below 2.93V. Use Value: Eliminates need for discrete diode-OR and manual reset circuits, reducing BOM count by 4 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367PKA29-T | Replaces RESET IN with BATT ON push-pull output; identical reset threshold and timing | Used where battery-backup status indication is required instead of secondary supply monitoring | Select when visual/LED feedback of backup mode is needed, not auxiliary voltage supervision |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no auxiliary RESET IN; 350ms default timeout; 2.5µA IQ | Lacks chip-enable gating and battery switchover; suited for simple reset-only applications | Select for cost-sensitive designs without memory protection or backup power requirements |
Compared with MAX6367PKA29-T and TPS3808G33DBVR, the MAX6368PKA29-T uniquely combines programmable secondary-supply monitoring, integrated SRAM power switching, and chip-enable gating-enabling single-chip protection for battery-backed memory systems where reliability and space are critical.
Availability
MAX6368PKA29-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and POS terminal backup memory requiring stable component supply and long-term lifecycle support.
Supply support for MAX6368PKA29-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX6365–MAX6368 family was designed specifically for microprocessor systems needing integrated power monitoring, battery switchover, and memory write protection in ultra-small form factors.
FAQ
What is the exact reset threshold voltage of the MAX6368PKA29-T?
The MAX6368PKA29-T has a factory-trimmed VCC reset threshold of 2.93V, with guaranteed tolerance of ±0.07V (2.85V to 3.00V) over temperature. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix "29". The device does not allow field adjustment of this primary threshold.
How does the RESET IN pin function on the MAX6368PKA29-T?
The RESET IN pin on the MAX6368PKA29-T compares an external voltage against an internal 1.235V reference. When the voltage at RESET IN falls below 1.235V ±0.05V, the device asserts the open-drain RESET output low. The propagation delay from RESET IN falling edge to RESET assertion is 1.5µs typical, enabling fast response to secondary supply failures.
What package type and dimensions does the MAX6368PKA29-T use?
The MAX6368PKA29-T uses an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm with standard gull-wing leads. It is RoHS-compliant and available in tape-and-reel format (2500 pieces per reel). The top-mark "AACS" corresponds to the PKA29 variant per Maxim's Device Marking Codes table.
Does the MAX6368PKA29-T support battery-backup operation, and what are the switchover conditions?
Yes, the MAX6368PKA29-T supports automatic battery-backup operation. Switchover engages when both conditions are met: VCC falls below the 2.93V reset threshold AND VCC is at least 20mV lower than VBATT. Disengagement occurs when VCC rises 20mV above VBATT. This 40mV hysteresis prevents chattering during slow supply decay.
What is the maximum load current the MAX6368PKA29-T can deliver from its OUT pin?
The MAX6368PKA29-T can deliver up to 150mA from the OUT pin when powered by VCC (at VCC = 4.75V), and up to 20mA when powered by BATT (at VBATT = 3.0V). The VCC-to-OUT on-resistance is 4.6Ω typical at VCC = 2.38V/25mA, and BATT-to-OUT on-resistance is VBATT – 0.15V typical at VBATT = 3.0V/10mA.
MAX6368PKA29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX6368PKA29-T FAQ
1.How can I place an order for MAX6368PKA29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368PKA29-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 MAX6368PKA29-T reliable?
The price and inventory of MAX6368PKA29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368PKA29-T is usually 5 days.
3.What payment methods are accepted for MAX6368PKA29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368PKA29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368PKA29-T?
MAX6368PKA29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368PKA29-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 MAX6368PKA29-T?
For technical support, including MAX6368PKA29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368PKA29-T requirements.
6.How does Aetrix verify that MAX6368PKA29-T is sourced from the original manufacturer or authorized distributors?
All MAX6368PKA29-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 MAX6368PKA29-T meets industry standards.
7.What is the process for return or replacement of MAX6368PKA29-T?
All MAX6368PKA29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368PKA29-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 MAX6368PKA29-T part is unused and in its original packaging.
Return procedure for MAX6368PKA29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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