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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:2,400
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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 monitors VCC supply voltage (reset threshold = 2.93V), asserts active-low open-drain RESET during power-up/down/brownout, switches OUT between VCC and backup battery (VBATT), and gates CE signals with 1.5ns propagation delay. Used in portable equipment requiring reliable memory write protection during power failure.
For engineers reviewing the MAX6368PKA29+T datasheet, MAX6368PKA29+T pinout, MAX6368PKA29+T application, or MAX6368PKA29+T equivalent, key selection criteria include its 2.93V factory-set reset threshold, 1.235V auxiliary RESET IN comparator, 150ms minimum reset timeout, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6368PKA29+T integrates four core functions: precision VCC monitoring with 2.93V ±45mV threshold, automatic VCC-to-battery switchover when VCC falls below VBATT by >20mV, chip-enable signal gating via transmission gate (20–100Ω on-resistance), and auxiliary RESET IN comparator referenced to 1.235V internal bandgap.
Its RESET output is open-drain active-low, guaranteed functional down to 1.2V VCC or VBATT supply. The device operates across -40°C to +85°C, supports up to 150mA VCC-sourced output current, and provides 12µs reset-to-CE OUT delay for controlled memory access termination during fault events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (±45mV) - sets precise brownout detection point for +3.3V systems |
| RESET Output Type | Open-drain active-low - enables wired-OR configuration and level-shifting flexibility |
| RESET Timeout Period | 150ms min - ensures µP completes full reset initialization before release |
| Quiescent Supply Current | 10µA (typ) - minimizes standby power in battery-backed applications |
| RESET IN Threshold | 1.235V (±50mV) - enables external undervoltage monitoring of secondary supplies |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout or single-cell Li-ion backup |
| Package | 8-pin SOT23 - surface-mount footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6368PKA29+T is housed in an 8-pin SOT23 package with standard pinout and thermal pad omitted. Pin assignments are validated per Maxim's official datasheet revision 5 (10/11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low continuously during VCC < 2.93V, RESET IN < 1.235V, or after watchdog timeout; requires external pullup |
| 2 CE IN | Chip-enable input | Controls CE gating path; low disables CE OUT during reset to prevent RAM corruption |
| 3 GND | Ground reference | Common return for all internal circuits and output drivers |
| 4 RESET IN | Auxiliary reset input | Comparator input referenced to 1.235V; falling edge below threshold triggers reset assertion |
| 5 VCC | Main supply input | Primary power source (1.2V–5.5V); powers internal logic and sources OUT during normal operation |
| 6 OUT | Output power rail | Switches between VCC and VBATT based on switchover logic; delivers up to 150mA from VCC |
| 7 BATT | Backup battery input | Provides backup power when VCC drops below threshold and VBATT > VCC + 20mV |
| 8 CE OUT | Chip-enable output | Gated CE signal; goes low only when CE IN is low and reset is not asserted; actively pulled to OUT when disconnected |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.93V reset threshold | Enables accurate brownout detection for +3.3V logic without external resistor networks |
| 1.235V internal reference for RESET IN | Allows programmable secondary supply monitoring using two external resistors (R1/R2) |
| 1.5ns CE IN to CE OUT propagation delay | Supports high-speed µP and DSP interfaces without timing violation in normal operation |
| 150ms minimum reset timeout period | Guarantees sufficient hold time for µP reset initialization across temperature and voltage extremes |
| 10µA supply current (no load) | Extends battery life in portable devices operating in long-duration backup mode |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retains SRAM data during main supply interruption. IC Role / Device Role / Timing Role: Supervisory IC monitors VCC, switches OUT to backup battery, gates CE to freeze memory writes, and asserts RESET to halt processor execution. Use Value: Prevents data loss and system crash during transient brownouts using 2.93V threshold and 150ms reset hold. | Use Scenario: Remote I/O node maintains real-time clock and configuration registers during AC power dropout. IC Role / Device Role / Timing Role: Provides VCC supervision, battery switchover, and CE gating to isolate volatile memory during power transition. Use Value: Ensures deterministic behavior with 1.235V RESET IN used to monitor auxiliary 5V analog supply integrity. |
| POS Terminal Data Logging | Smart Meter Firmware Recovery |
Use Scenario: Retail terminal logs transaction data to SRAM before main power fails. IC Role / Device Role / Timing Role: Asserts RESET to suspend µP, gates CE to block write cycles, and sustains OUT from battery to preserve RAM contents. Use Value: Eliminates need for external reset debouncing or discrete switchover MOSFETs due to integrated 20mV hysteresis and low RON switching. | Use Scenario: Electricity meter recovers firmware state after grid outage using retained SRAM image. IC Role / Device Role / Timing Role: Monitors both main VCC and auxiliary DC-DC output via RESET IN, triggering safe reboot sequence upon dual-supply fault. Use Value: Dual-threshold supervision (2.93V VCC + 1.235V REF) enables robust fault discrimination in safety-critical metering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368HKA29+T | Same reset threshold (2.93V) and RESET IN function, but push-pull RESET output instead of open-drain | Requires no external pullup resistor; incompatible with wired-OR reset bus topologies | Select when board-level reset signaling uses dedicated lines and pullup components must be minimized |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no RESET IN input, no battery switchover, 350ms reset timeout | Lacks auxiliary monitoring and backup power management; suited for simpler VCC-only supervision | Choose only if battery backup and secondary supply monitoring are unnecessary and 3.3V threshold suffices |
Compared with MAX6368PKA29+T, the MAX6368HKA29+T offers identical supervision functionality but differs in RESET drive architecture, while TPS3808G33DBVR omits critical features like RESET IN and battery switchover-making it unsuitable for applications requiring dual-supply fault detection or seamless backup power handoff.
Availability
MAX6368PKA29+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, POS terminal data logging, and smart meter firmware recovery 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) designs precision analog and mixed-signal ICs for power, sensing, interface, and reliability-critical applications.
The MAX6365–MAX6368 family was engineered specifically for µP-based systems needing integrated power supervision, battery backup control, and memory write protection in ultra-small form factors.
FAQ
What is the factory-set reset threshold voltage for MAX6368PKA29+T?
The MAX6368PKA29+T has a factory-set reset threshold of 2.93V (minimum 2.85V, maximum 3.00V) for VCC monitoring. This value is laser-trimmed during production and applies across the full -40°C to +85°C operating temperature range. The threshold ensures reliable detection of brownout conditions in +3.3V systems without requiring external calibration components.
How does the RESET IN pin function on MAX6368PKA29+T?
The RESET IN pin on MAX6368PKA29+T compares an external voltage against an internal 1.235V reference. When the voltage at RESET IN falls below 1.235V (±50mV), the device asserts the active-low RESET output. This allows monitoring of secondary power rails-such as a 5V analog supply-using a simple resistor divider network connected to RESET IN.
What is the purpose of the CE IN and CE OUT pins on MAX6368PKA29+T?
The CE IN and CE OUT pins on MAX6368PKA29+T implement chip-enable signal gating to prevent erroneous writes to CMOS RAM during power faults. During normal operation, CE IN passes directly to CE OUT through a low-on-resistance transmission gate. When RESET is asserted, CE OUT is disabled-blocking memory access until power stabilizes and reset completes.
Does MAX6368PKA29+T support battery backup switchover, and what are the conditions?
Yes, MAX6368PKA29+T supports automatic battery backup switchover. Switchover occurs when two conditions are met: (1) VCC falls below the 2.93V reset threshold, and (2) VBATT exceeds VCC by at least 20mV. Once engaged, OUT connects to BATT, supplying up to 150mA from VCC or limited current from battery depending on load and VBATT level.
What package type and pin count does MAX6368PKA29+T use?
MAX6368PKA29+T uses an 8-pin SOT23 package with standardized pinout matching Maxim's documented layout (pin 1 = RESET, pin 8 = CE OUT). This miniature surface-mount package measures 2.9mm × 1.6mm × 1.1mm and is RoHS-compliant and lead(Pb)-free, indicated by the "+T" suffix in the part number.
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:
- Active
- 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.
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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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