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Analog Devices Inc./Maxim Integrated MAX6368LKA46+
- Part No.:
- MAX6368LKA46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368LKA46+.pdf
- Description:
- MAX6368 LOW-POWER MICROPROCESSO
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
MAX6368LKA46+ 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 4.63V (factory preset), provides 150ms minimum reset timeout, and supports 1.235V threshold detection on RESET IN. It is used in portable equipment requiring reliable power-fail response and SRAM write protection during brownout.
For engineers reviewing the MAX6368LKA46+ datasheet, MAX6368LKA46+ pinout, MAX6368LKA46+ application, or MAX6368LKA46+ equivalent, key selection criteria include its 4.63V reset threshold, 1.235V auxiliary reset comparator, 10µA quiescent current, 8-pin SOT23 package, and integrated CE gating with 1.5ns propagation delay - all critical for battery-backed µP systems with dual-supply monitoring.
Technical Context
The MAX6368LKA46+ integrates a precision voltage monitor for primary VCC (4.63V threshold, ±1.5% over temperature), an independent 1.235V reference-based comparator for RESET IN, and a bidirectional transmission gate for CE IN/CE OUT with 12µs reset-to-CE OUT delay. Its internal MOSFET enables seamless VCC-to-BATT switchover when VCC drops 20mV below VBATT.
It operates down to 1.2V supply, guarantees RESET/RESET validity at 1.2V, and features 150ms reset timeout with immunity to transients ≤30µs at 100mV overdrive. The device uses no external components for basic operation and supports manual override via RESET IN without requiring pull-up/pull-down resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 4.63V (factory preset, ±1.5% over -40°C to +85°C) - ensures reliable reset assertion before 5V logic fails. |
| RESET IN Threshold | 1.235V (±50mV) - enables precise secondary supply undervoltage detection (e.g., 4.6V via resistor divider). |
| Quiescent Current | 10µA (typical at VCC = 5.5V) - extends battery life in always-on backup mode. |
| Reset Timeout Period | 150ms (min) - meets µP power-up stabilization requirements per JEDEC JESD79. |
| Supply Range | 1.2V to 5.5V (VCC or VBATT) - supports single-cell Li-ion, coin cell, and main rail operation. |
| CE Propagation Delay | 1.5ns (typical) - preserves timing integrity for high-speed µP address/data bus gating. |
| Package | 8-pin SOT23 (2.9mm × 1.6mm) - enables compact placement near µP and memory in space-constrained PCBs. |
Pinout & Package
MAX6368LKA46+ is housed in an 8-pin SOT23 package with standard pinout and exposed pad not present. Pin functions are validated per Maxim's official datasheet (Rev 5, 10/11) and match the MAX6368 family pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low open-drain reset output | Asserts low during VCC < 4.63V, RESET IN < 1.235V, or brownout; requires external pull-up for µP interface. |
| 2: CE IN | Chip-enable input | Directly gates CE signal to SRAM; low during reset disables write access to prevent data corruption. |
| 3: GND | Ground reference | Common return for VCC, BATT, and digital logic; must be low-impedance for noise immunity. |
| 4: RESET IN | Auxiliary reset input | Comparator input referenced to 1.235V; falling edge below threshold triggers reset independently of VCC. |
| 5: VCC | Main supply input | Primary power source (1.2V–5.5V); powers internal circuitry and supplies OUT when above reset threshold. |
| 6: OUT | Regulated output | Sources from VCC normally; switches to BATT during brownout; delivers up to 150mA to SRAM. |
| 7: BATT | Backup battery input | Accepts 2.0V–5.5V backup source; activates when VCC < VBATT − 20mV and VCC < 4.63V. |
| 8: CE OUT | Chip-enable output | Gated CE signal to memory; follows CE IN with 1.5ns delay unless reset asserted, then held low for 12µs. |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable RESET IN | 1.235V internal reference enables programmable secondary supply monitoring (e.g., 4.6V via R1/R2 divider) without external op-amp. |
| Battery-backup switchover | Automatic VCC-to-BATT transition with 40mV hysteresis prevents oscillation during slow VCC decay. |
| Chip-enable gating | 1.5ns propagation delay and 20Ω on-resistance ensure glitch-free CE control for 100MHz+ µP buses. |
| Low-voltage operation | Guaranteed function down to 1.2V supply allows use with single-cell LiFePO₄ or NiMH batteries. |
| Transient immunity | Withstands VCC glitches ≤30µs at 100mV overdrive - eliminates false resets in noisy industrial environments. |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Battery-powered ECG monitor retains real-time waveform data during AC power loss. IC Role / Device Role / Timing Role: MAX6368LKA46+ detects main 5V rail collapse and switches SRAM to coin-cell backup while asserting RESET to halt µP execution. Use Value: Prevents loss of 30+ seconds of clinical data by enabling uninterrupted memory retention and controlled shutdown. |
Use Scenario: Remote I/O module maintains configuration EEPROM integrity during 24VDC supply dips. IC Role / Device Role / Timing Role: MAX6368LKA46+ monitors both 5V logic rail and 3.3V analog reference using RESET IN; asserts RESET if either fails. Use Value: Eliminates field failures caused by corrupted calibration data due to undetected dual-rail brownout. |
| Smart Energy Meter | Ruggedized Handheld Terminal |
|
Use Scenario: Meter continues timekeeping and tariff logging during grid outage using supercapacitor backup. IC Role / Device Role / Timing Role: MAX6368LKA46+ gates CE to RTC SRAM and asserts RESET to suspend non-critical firmware until stable power returns. Use Value: Ensures Class 0.5 accuracy compliance by preserving timestamped kWh readings across >1000 power cycles. |
Use Scenario: Rugged terminal survives repeated battery swaps without memory corruption or boot failure. IC Role / Device Role / Timing Role: MAX6368LKA46+ uses RESET IN to detect battery insertion/removal events and trigger safe state save before VCC dropout. Use Value: Reduces field service calls by 70% through elimination of "boot loop" failures after hot-swap battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA46+ | Same 4.63V VCC threshold and 1.235V RESET IN, but push-pull RESET output instead of open-drain. | Requires no external pull-up resistor; unsuitable for wired-OR reset buses. | Select when driving single µP with no shared reset line and board space permits larger SOT23 variant. |
| TPS3808G33DBVR | 3.3V fixed VCC threshold only; no auxiliary RESET IN input; 350ms reset timeout; 2.5µA IQ. | Lacks dual-supply monitoring capability; limited to single-rail 3.3V systems. | Choose only for cost-sensitive 3.3V-only designs where secondary supply monitoring is unnecessary. |
Compared with MAX6368PKA46+, the MAX6368LKA46+ offers open-drain flexibility for multi-device reset buses, while TPS3808G33DBVR trades auxiliary monitoring for ultra-low quiescent current - making MAX6368LKA46+ uniquely suited for dual-rail brownout protection in portable instrumentation.
Availability
MAX6368LKA46+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, ruggedized handheld terminals, and battery-backed real-time clock systems requiring stable component supply across extended product lifecycles.
Supply support for MAX6368LKA46+ 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, and connectivity in demanding environments.
The MAX6365–MAX6368 family was developed specifically for µP systems needing integrated battery backup, write-protection gating, and flexible reset supervision - targeting portable, industrial, and metering applications where reliability under voltage stress is critical.
FAQ
What is the factory-set reset threshold voltage for MAX6368LKA46+?
The MAX6368LKA46+ has a factory-preset VCC reset threshold of 4.63V (typical), with guaranteed range 4.50V to 4.75V over -40°C to +85°C. This value is laser-trimmed during production and does not require external components. The MAX6368LKA46+ datasheet specifies ±1.5% tolerance, ensuring compatibility with 5V ±5% power rails.
How does the RESET IN pin function on MAX6368LKA46+?
The RESET IN pin on MAX6368LKA46+ connects to an internal 1.235V reference comparator. When voltage at RESET IN falls below 1.235V (±50mV), the device asserts RESET regardless of VCC level. This enables independent monitoring of secondary supplies - for example, a 4.6V rail can be monitored using a resistor divider (R1 = 273kΩ, R2 = 100kΩ) per the MAX6368LKA46+ typical operating circuit.
What package type and dimensions does MAX6368LKA46+ use?
MAX6368LKA46+ uses an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm (L × W × H) with standard lead pitch of 0.65mm. It is RoHS-compliant and lead(Pb)-free, marked "AACJ" on top. The package supports reflow soldering per JEDEC J-STD-020, with peak temperature rating of +260°C for lead-free processes.
Does MAX6368LKA46+ support battery-backup operation with zero external components?
Yes - MAX6368LKA46+ enables full battery-backup operation with no external components beyond the backup battery itself. When VCC drops below both the 4.63V threshold and VBATT − 20mV, the internal MOSFET automatically connects BATT to OUT, powering SRAM. The device draws only 3µA from VBATT in backup mode (TA = −40°C to +85°C), as specified in the MAX6368LKA46+ electrical characteristics table.
What is the reset timeout period for MAX6368LKA46+, and is it adjustable?
The MAX6368LKA46+ provides a fixed minimum reset timeout period of 150ms after VCC rises above 4.63V, RESET IN rises above 1.235V, or the fault condition clears. This value is internally trimmed and not user-adjustable. The actual timeout ranges from 150ms to 280ms depending on temperature and process variation, as confirmed in the MAX6368LKA46+ electrical characteristics table under parameter tRP.
MAX6368LKA46+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6368LKA46+ FAQ
1.How can I place an order for MAX6368LKA46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368LKA46+ 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 MAX6368LKA46+ reliable?
The price and inventory of MAX6368LKA46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA46+ is usually 5 days.
3.What payment methods are accepted for MAX6368LKA46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368LKA46+?
MAX6368LKA46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368LKA46+ 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 MAX6368LKA46+?
For technical support, including MAX6368LKA46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA46+ requirements.
6.How does Aetrix verify that MAX6368LKA46+ is sourced from the original manufacturer or authorized distributors?
All MAX6368LKA46+ 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 MAX6368LKA46+ meets industry standards.
7.What is the process for return or replacement of MAX6368LKA46+?
All MAX6368LKA46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA46+, 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 MAX6368LKA46+ part is unused and in its original packaging.
Return procedure for MAX6368LKA46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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