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Analog Devices Inc./Maxim Integrated MAX6368LKA26-T
- Part No.:
- MAX6368LKA26-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368LKA26-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,998
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Product details
Overview
MAX6368LKA26-T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, battery backup switching, and chip-enable gating. It monitors VCC (1.2V–5.5V), asserts active-low open-drain RESET when VCC falls below 2.63V or RESET IN drops below 1.235V, and maintains CMOS RAM during power failure via automatic VCC/BATT switchover. Used in portable POS terminals and industrial controllers requiring reliable brownout detection and secondary supply monitoring.
For engineers reviewing the MAX6368LKA26-T datasheet, MAX6368LKA26-T pinout, MAX6368LKA26-T application, or MAX6368LKA26-T equivalent, key selection criteria include its 2.63V factory-trimmed reset threshold, 1.235V auxiliary RESET IN comparator, 150ms minimum reset timeout, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained embedded systems.
Technical Context
The MAX6368LKA26-T integrates a precision voltage monitor for primary VCC (2.63V threshold) and an independent 1.235V reference comparator for external RESET IN, enabling dual-supply fault detection. Its internal MOSFET switch routes power from VCC or BATT to OUT with <4.6Ω on-resistance at 2.38V, while CE IN/CE OUT transmission gate provides 1.5ns propagation delay and 20–100Ω on-resistance for chip-enable signal gating.
Reset assertion is triggered by VCC undervoltage, RESET IN falling below 1.235V, or manual intervention - with guaranteed RESET validity down to 1.2V supply. The device operates across -40°C to +85°C, supports 150ms min reset timeout, and features 100ns glitch immunity on RESET IN with 1.5µs propagation delay from RESET IN fall to RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.55V to 2.70V (typ 2.63V); ensures reliable power-up reset for 2.5V/3.3V logic rails |
| RESET IN Threshold | 1.185V to 1.285V (typ 1.235V); enables precise secondary supply monitoring via external resistor divider |
| Quiescent Supply Current | 10µA (max at VCC = 5.5V); minimizes standby power in battery-backed systems |
| Reset Timeout Period | 150ms to 280ms; guarantees µP initialization stability after power recovery |
| VCC-to-OUT On-Resistance | 4.6Ω (at VCC = 2.38V, IOUT = 25mA); limits voltage drop during high-current SRAM operation |
| Battery Backup Current | 3µA (max at VBATT = 2.8V, TA = -40°C to +85°C); extends backup runtime in long-term storage |
| CE IN to CE OUT Delay | 2ns to 9ns (50Ω source, 50pF load); preserves timing integrity for fast µP address/data gating |
Pinout & Package
MAX6368LKA26-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts in portable and industrial equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, RESET IN fault, or brownout; requires external pullup for system reset signaling |
| 2 CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write access during power faults |
| 3 GND | Ground reference | Common return path for VCC, BATT, and digital logic; must be low-impedance for noise immunity |
| 4 RESET IN | Auxiliary reset input | Compares external voltage to 1.235V reference; falling edge triggers reset for secondary supply monitoring |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation |
| 6 OUT | Power output | Switches between VCC and BATT based on voltage comparison; delivers up to 150mA to SRAM |
| 7 BATT | Backup battery input | Provides hold-up power when VCC drops; requires ≥20mV above VCC to engage switchover |
| 8 CE OUT | Chip-enable output | Passes CE signal only when CE IN is high and reset is deasserted; prevents memory corruption during faults |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable RESET IN | 1.235V internal reference enables programmable undervoltage detection for secondary supplies using external resistors |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance allow real-time SRAM write protection without timing violations |
| Battery switchover | Automatic VCC/BATT handoff with 40mV hysteresis prevents oscillation during slow VCC decay |
| Low-power operation | 10µA supply current and 3µA battery-backup current extend operational life in energy-sensitive applications |
| Reset validity down to 1.2V | Guaranteed RESET assertion and release even as VCC or VBATT decays to minimum operating voltage |
Applications
| Portable POS Terminals | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-backed transaction logging during AC power loss in retail payment systems. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and secondary 5V analog supply; gates SRAM CE to preserve sales data during brownout. Use Value: Prevents data corruption by asserting RESET within 20µs of VCC falling below 2.63V and maintaining CE OUT low for 12µs after reset assertion. |
Use Scenario: Maintaining real-time clock and configuration memory during factory floor power fluctuations. IC Role / Device Role / Timing Role: Monitors 2.5V I/O rail with primary reset and 1.235V reference for 1.8V core supply monitoring via RESET IN. Use Value: Dual-threshold detection ensures fail-safe response to both main and auxiliary supply faults without additional comparators. |
| Medical Handheld Devices | Smart Energy Meters |
|
Use Scenario: Preserving calibration data and patient history during battery replacement in portable diagnostics tools. IC Role / Device Role / Timing Role: Switches SRAM power from depleted main battery to backup cell using BATT switchover; holds CE IN gated during transition. Use Value: 3µA battery-backup current enables >10-year data retention on coin-cell backup without periodic refresh. |
Use Scenario: Securing meter firmware and tariff tables during grid voltage sags in smart grid infrastructure. IC Role / Device Role / Timing Role: Provides 150ms reset timeout and 100ns glitch immunity to reject transient noise on 230VAC-derived 3.3V supply. Use Value: Immunity to 30µs transients 100mV below threshold eliminates spurious resets in electrically noisy utility environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA26-T | Same reset threshold (2.63V) and RESET IN function, but push-pull RESET output instead of open-drain | Eliminates need for external pullup resistor; unsuitable where wired-OR reset bus is required | Select when driving single-load reset lines directly without bus sharing |
| MAX6368HKA26-T | Identical functionality and thresholds, but offers active-high open-drain RESET output | Compatible with µPs requiring active-high reset assertion; incompatible with standard active-low reset inputs | Choose only for systems with active-high reset architecture and no level-shifting capability |
Compared with MAX6368LKA26-T, the PKA variant simplifies board layout by removing the pullup resistor but sacrifices bus-sharing flexibility, while the HKA variant supports active-high reset domains at the cost of requiring redesign of reset signal routing and µP interface logic.
Availability
MAX6368LKA26-T is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLC controllers, medical handheld devices, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6368LKA26-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 targets space-constrained µP systems needing integrated power supervision, battery backup, and memory write protection - eliminating discrete comparators, MOSFETs, and logic gates.
FAQ
What is the factory-set reset threshold voltage for MAX6368LKA26-T?
The MAX6368LKA26-T has a factory-trimmed VCC reset threshold of 2.55V (min), 2.63V (typ), and 2.70V (max). This value is laser-trimmed during production and applies specifically to the '26' suffix variant, ensuring accurate power-on reset for 2.5V and 3.3V logic systems without external adjustment.
How does the RESET IN pin function on MAX6368LKA26-T?
The RESET IN pin on MAX6368LKA26-T compares an external voltage to an internal 1.235V reference. When the applied voltage falls below 1.185V (min), the device asserts RESET. This enables monitoring of secondary supplies - for example, a 5V rail can be scaled via resistor divider to trigger reset at 4.60V nominal using R1 = 273kΩ and R2 = 100kΩ.
What package type and dimensions does MAX6368LKA26-T use?
MAX6368LKA26-T uses an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm with standard JEDEC MO-178 footprint. The package is lead(Pb)-free and RoHS-compliant, with thermal pad omitted - suitable for reflow soldering and high-density PCB assembly in portable electronics.
Does MAX6368LKA26-T support battery backup operation with zero external components?
Yes - MAX6368LKA26-T enables autonomous battery backup with no external MOSFETs or diodes. When VCC drops below the reset threshold and VBATT exceeds VCC by ≥20mV, the internal switch automatically connects BATT to OUT. A 0.1µF bypass capacitor on VCC is recommended for transient immunity, but no other components are required for basic switchover.
What is the maximum load current supported by the OUT pin of MAX6368LKA26-T?
The OUT pin of MAX6368LKA26-T delivers up to 150mA when sourced from VCC (at VCC = 4.75V), and up to 25mA when sourced from BATT (at VBATT = 2.3V). The VCC-to-OUT on-resistance is 4.6Ω (typ) at 2.38V, resulting in ≤115mV dropout at 25mA - sufficient for powering small SRAMs and RTCs in backup mode.
MAX6368LKA26-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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6368LKA26-T FAQ
1.How can I place an order for MAX6368LKA26-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368LKA26-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 MAX6368LKA26-T reliable?
The price and inventory of MAX6368LKA26-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA26-T is usually 5 days.
3.What payment methods are accepted for MAX6368LKA26-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA26-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368LKA26-T?
MAX6368LKA26-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368LKA26-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 MAX6368LKA26-T?
For technical support, including MAX6368LKA26-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA26-T requirements.
6.How does Aetrix verify that MAX6368LKA26-T is sourced from the original manufacturer or authorized distributors?
All MAX6368LKA26-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 MAX6368LKA26-T meets industry standards.
7.What is the process for return or replacement of MAX6368LKA26-T?
All MAX6368LKA26-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA26-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 MAX6368LKA26-T part is unused and in its original packaging.
Return procedure for MAX6368LKA26-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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