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Analog Devices Inc./Maxim Integrated MAX6368LKA23-T
- Part No.:
- MAX6368LKA23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368LKA23-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,162
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Product details
Overview
MAX6368LKA23-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 2.32V reset threshold (VTH), 150ms minimum reset timeout (tRP), and 10µA quiescent supply current. It is used in portable equipment and industrial controllers to maintain SRAM data integrity during power failure.
For engineers reviewing the MAX6368LKA23-T datasheet, MAX6368LKA23-T pinout, MAX6368LKA23-T application, or MAX6368LKA23-T equivalent, this page delivers verified functional identity, SOT23-8 package mapping, RESET IN comparator behavior (1.235V threshold), battery-switchover hysteresis (±20mV), and CE gating propagation delay (≤9ns), all confirmed from Maxim's official datasheet Rev 5.
Technical Context
The MAX6368LKA23-T integrates a precision voltage comparator for the RESET IN input referenced to an internal 1.235V bandgap, enabling programmable secondary supply monitoring via external resistor dividers. Its VCC-to-OUT and BATT-to-OUT MOSFET switches provide seamless power-source handover with 40mV hysteresis to prevent oscillation during slow VCC decay.
Chip-enable gating uses a transmission gate architecture with ≤9ns propagation delay (50Ω source, 50pF load) and active pull-up to OUT when disabled. The device asserts RESET (open-drain active-low) continuously during VCC brownout, RESET IN undervoltage (<1.235V), or after manual assertion, holding for ≥150ms post-recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 2.25V to 2.38V (factory-set 2.32V); ensures reliable µP reset initiation at nominal +2.5V supply rail |
| RESET IN Threshold (VRTH) | 1.185V to 1.285V (typ 1.235V); enables accurate secondary supply monitoring via external divider |
| Reset Timeout Period (tRP) | 150ms to 280ms; guarantees sufficient µP initialization time after power recovery |
| Quiescent Supply Current (ICC) | 10µA typical at VCC = 5.5V; supports ultra-low-power battery-backed operation |
| VCC/VBATT Operating Range | 1.2V to 5.5V; allows direct interface with +1.2V logic, +2.5V, +3.3V, and +5.0V systems |
| Battery-Backup Supply Current (IBACK) | 3µA max at TA = −40°C to +85°C; minimizes battery drain during extended hold-up |
| CE IN to CE OUT Propagation Delay | 2ns to 9ns (50Ω/50pF); preserves timing integrity for high-speed µP address/data bus gating |
Pinout & Package
MAX6368LKA23-T is housed in an 8-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and Pb-free finish (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Asserts low during VCC brownout, RESET IN undervoltage, or watchdog timeout; 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 VCC, BATT, and internal circuitry; must be low-impedance |
| 4 - RESET IN | Auxiliary reset input | Compares against 1.235V internal reference; falling edge below threshold triggers reset assertion |
| 5 - VCC | Main supply input | Powers device and supplies OUT during normal operation; monitored for reset generation |
| 6 - OUT | Power output | Sources from VCC normally; switches to BATT during brownout; drives SRAM VCC |
| 7 - BATT | Backup battery input | Provides hold-up power when VCC < VTH and VCC < VBATT; enables >100hr data retention |
| 8 - CE OUT | Chip-enable output | Passes CE signal only when reset is deasserted and CE IN is high; prevents erroneous writes |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable RESET IN | 1.235V internal reference enables precise secondary supply monitoring (e.g., 4.60V via R1/R2 divider) |
| Battery-switchover hysteresis | ±20mV prevents oscillation during slow VCC decay; ensures clean transition between VCC and BATT |
| Chip-enable gating propagation delay | ≤9ns (50Ω/50pF) preserves timing margins for fast µPs and DSPs without added latency |
| Ultra-low backup current | 3µA max IBACK extends lithium coin-cell life to >5 years in typical SRAM hold-up applications |
| 1.2V minimum operating voltage | Supports integration into modern low-voltage SoC platforms without level-shifting overhead |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered ECG monitor retains real-time waveform buffer during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and triggers battery switchover while asserting RESET to halt CPU and enable CE gating. Use Value: Prevents data corruption in SRAM during 200ms brownout; 3µA backup current enables >3-year coin-cell service life. |
Use Scenario: Programmable logic controller maintains I/O state and configuration memory during factory line voltage sag. IC Role / Device Role / Timing Role: MAX6368LKA23-T acts as system-level power supervisor, using RESET IN to monitor isolated 24V DC-DC output. Use Value: Secondary supply monitoring (via 1.235V reference + resistor network) detects 24V rail collapse before main 5V fails, enabling preemptive shutdown. |
| Smart Energy Meter | Ruggedized Handheld Terminal |
Use Scenario: Utility meter logs consumption data to FRAM during grid outage; requires tamper-proof power fail detection. IC Role / Device Role / Timing Role: Dual-threshold supervision: VTH (2.32V) guards 3.3V MCU rail; RESET IN monitors 1.8V RTC supply. Use Value: Guarantees 150ms+ reset hold time for safe FRAM write completion; 1.235V comparator rejects noise-induced false triggers. |
Use Scenario: Field technician terminal operates on Li-ion battery and must retain GPS position cache during hot-swap battery replacement. IC Role / Device Role / Timing Role: Supervisory IC manages seamless VCC/BATT handover and gates CE to 256KB SRAM during transition. Use Value: 40mV switchover hysteresis eliminates flicker during battery insertion; 10µA ICC extends standby runtime to 120 days. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA23-T | Same functionality and pinout; differs only in output structure - push-pull active-low RESET vs. open-drain on MAX6368LKA23-T | Eliminates need for external pull-up resistor; better suited for driving multiple loads or noisy environments | Select PKA version if system lacks pull-up or requires stronger drive capability; LKA retains flexibility for wired-OR configurations |
| MAX6368HKA23-T | Identical core functions; differs in RESET output type - open-drain active-high vs. active-low on LKA variant | Compatible with µPs requiring active-high reset assertion; avoids level-shifter in legacy designs | Choose HKA when interfacing with processors like older ARM7 or PIC that mandate active-high reset signaling |
Compared with MAX6368PKA23-T and MAX6368HKA23-T, the MAX6368LKA23-T provides open-drain active-low reset output - optimal for shared-bus systems and compatibility with standard µP reset inputs, while retaining identical battery switchover, CE gating, and RESET IN functionality.
Availability
MAX6368LKA23-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and ruggedized handheld terminals requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for MAX6368LKA23-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 analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The MAX6365–MAX6368 family was designed specifically for space-constrained µP systems needing integrated power monitoring, battery backup, and memory write protection - targeting portable, industrial, and metering applications where reliability and ultra-low quiescent current are critical.
FAQ
What is the exact reset threshold voltage for MAX6368LKA23-T?
The MAX6368LKA23-T has a factory-preset reset threshold (VTH) of 2.32V (min 2.25V, max 2.38V), optimized for reliable supervision of +2.5V supply rails. This value is laser-trimmed during production and guaranteed over −40°C to +85°C. The MAX6368LKA23-T datasheet specifies it under Electrical Characteristics, Reset Threshold (VTH) row.
How does the RESET IN pin function on MAX6368LKA23-T?
The RESET IN pin on MAX6368LKA23-T compares an external voltage against an internal 1.235V reference. When the applied voltage falls below 1.235V (1.185V min, 1.285V max), the device asserts RESET. This enables programmable monitoring of secondary supplies - for example, a 4.60V rail can be tracked using a resistor divider per VRTH = 1.235V × (R1/R2 + 1). The MAX6368LKA23-T propagates the event with ≤1.5µs delay.
What package type and dimensions does MAX6368LKA23-T use?
The MAX6368LKA23-T uses an 8-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. It is RoHS-compliant and Pb-free, marked "AACO" on top. This miniature footprint supports high-density PCB layouts in portable and battery-powered devices where board space is constrained - a key design advantage of the MAX6368LKA23-T.
Does MAX6368LKA23-T support battery backup for SRAM, and how does switchover work?
Yes, MAX6368LKA23-T supports seamless battery backup for CMOS SRAM. When VCC drops below the reset threshold and falls 20mV below VBATT, the internal MOSFET switches OUT from VCC to BATT. Switchover includes 40mV hysteresis to prevent chatter. In backup mode, MAX6368LKA23-T draws only 3µA from the battery (excluding load current), enabling multi-year data retention - a core capability of the MAX6368LKA23-T.
What is the reset timeout period for MAX6368LKA23-T, and is it adjustable?
The MAX6368LKA23-T features a fixed minimum reset timeout period (tRP) of 150ms, with typical value 200ms and maximum 280ms over temperature. This parameter is not user-adjustable - it is internally generated and guaranteed across −40°C to +85°C. The 150ms+ hold time ensures robust µP initialization after power recovery, a non-negotiable requirement addressed by the MAX6368LKA23-T's design.
MAX6368LKA23-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:
- 2.32V
- 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
MAX6368LKA23-T FAQ
1.How can I place an order for MAX6368LKA23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368LKA23-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 MAX6368LKA23-T reliable?
The price and inventory of MAX6368LKA23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA23-T is usually 5 days.
3.What payment methods are accepted for MAX6368LKA23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368LKA23-T?
MAX6368LKA23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368LKA23-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 MAX6368LKA23-T?
For technical support, including MAX6368LKA23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA23-T requirements.
6.How does Aetrix verify that MAX6368LKA23-T is sourced from the original manufacturer or authorized distributors?
All MAX6368LKA23-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 MAX6368LKA23-T meets industry standards.
7.What is the process for return or replacement of MAX6368LKA23-T?
All MAX6368LKA23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA23-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 MAX6368LKA23-T part is unused and in its original packaging.
Return procedure for MAX6368LKA23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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