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Analog Devices Inc./Maxim Integrated MAX6318LHUK46CY-T
- Part No.:
- MAX6318LHUK46CY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK46CY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,847
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Product details
Overview
The MAX6318LHUK46CY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity and provides reset assertion during power-up, brownout, or software hang conditions in embedded control systems.
For engineers reviewing the MAX6318LHUK46CY-T datasheet, MAX6318LHUK46CY-T pinout, MAX6318LHUK46CY-T application, or MAX6318LHUK46CY-T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), bidirectional compatibility with Motorola 68HC11-style reset buses, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
This device integrates a precision voltage monitor, programmable reset timer, and watchdog timer with edge-triggered WDI input. Its reset generator asserts active-low RESET when VCC falls below 4.63V ±2.5% over –40°C to +125°C, holding it low for ≥140ms after VCC recovers above threshold.
The watchdog circuit clears on any rising or falling edge at WDI (pulse width ≥50ns) and times out after 1.6s if unserviced; it remains disabled when WDI is left unconnected. The push/pull output drives RESET low with ≤0.4V VOL at 3.2mA sink and high with VOH ≥0.8×VCC at 500µA source, ensuring robust interface with µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over –40°C to +125°C - ensures reliable detection of 5V supply brownout before system instability. |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for µP initialization after power recovery. |
| Watchdog Timeout | 1.6s typical - provides adequate window to detect firmware hangs without false triggers. |
| Supply Current | 5µA typical at 3.6V - enables ultra-low-power operation in battery-backed systems. |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout down to 1V VCC. |
| Reset Output Type | Active-low, push/pull - eliminates need for external pullup and ensures fast, rail-to-rail logic levels. |
| Temperature Range | –40°C to +125°C - qualified for industrial and automotive under-hood applications. |
Pinout & Package
MAX6318LHUK46CY-T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. Thermal resistance θJA is 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push/pull reset output - sinks up to 3.2mA and sources 500µA; asserts low during VCC undervoltage, watchdog timeout, or MR activation. |
| 2 | GND | Ground reference - common return path for internal comparators, timers, and output stage. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 52kΩ; pulling low forces reset for full 140ms timeout period. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); must be toggled within 1.6s to prevent reset; left open to disable watchdog. |
| 5 | VCC | Supply voltage input - monitored for reset threshold violation; operates from 1.0V to 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timing resistors, and push/pull driver eliminate BOM cost and layout area. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, critical for fail-safe embedded controllers. |
| Immunity to short negative VCC transients | Withstands <4µs, 100mV undershoot glitches without spurious reset - improves system noise resilience. |
| AEC-Q100 qualified | Validated for automotive applications including engine control, body electronics, and ADAS subsystems. |
| Factory-trimmed precision threshold | 4.63V threshold with ±2.5% tolerance over full temperature range - removes need for calibration or trimming. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 5V supply rail powering MCU and CAN transceiver in under-hood ECU exposed to wide thermal and electrical stress. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 core upon VCC dip below 4.63V or software lockup detected via WDI timeout. Use Value: Prevents erratic MCU execution during cold cranking or load dump events; AEC-Q100 rating ensures compliance with ISO 16750-2. |
Use Scenario: Ensures deterministic restart of real-time controller after power interruption in factory automation cabinet. IC Role / Device Role / Timing Role: Generates 140ms minimum reset pulse synchronized to 5V rail recovery, while monitoring firmware health via WDI toggling from RTOS task. Use Value: Eliminates need for discrete RC reset network; 1.6s watchdog timeout balances responsiveness and false-trigger avoidance in deterministic cyclic tasks. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU Subsystem |
|
Use Scenario: Provides fail-safe reset supervision for safety-critical ARM-based pump controller operating from Li-ion backup supply. IC Role / Device Role / Timing Role: Asserts reset when main 3.3V rail drops below 4.63V (monitored via resistor divider), and detects firmware freeze via WDI edge detection. Use Value: Guaranteed reset down to VCC = 1V ensures safe shutdown even during battery depletion; MR pin enables hardware-initiated recalibration reset. |
Use Scenario: Supervises metrology SoC and communication module in ANSI C12.22-compliant smart meter with dual-supply architecture. IC Role / Device Role / Timing Role: Active-low push/pull RESET output interfaces directly to SoC reset pin; WDI driven by metrology firmware loop. Use Value: No external pullup reduces component count and leakage paths; 140ms reset timeout meets IEC 62056-21 power-fail recovery requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK46CY-T | Bidirectional active-low RESET output with integrated 4.7kΩ pullup and P-channel active pullup FET - supports Motorola 68HC11-style reset bus arbitration. | Required where µP must distinguish self-initiated vs. supervisor-initiated reset via two-cycle sampling protocol. | Select when interfacing with legacy 68HC11 or other bidirectional-reset µPs; not drop-in compatible due to different pin function (Pin 1 = bidirectional, not push/pull). |
| TLV803EB29DBZR | Fixed 2.93V reset threshold, no watchdog, SOT23-5, 35µA supply current - simpler single-function reset IC without supervision features. | Suitable only for basic power-on reset without software hang detection or manual reset capability. | Choose only if watchdog and MR functions are unnecessary; lacks 4.63V threshold, 1.6s watchdog, and AEC-Q100 qualification of MAX6318LHUK46CY-T. |
Compared with MAX6318MHUK46CY-T, the MAX6318LHUK46CY-T offers faster, lower-impedance push/pull drive ideal for modern µPs without bidirectional reset requirements; compared with TLV803EB29DBZR, it delivers comprehensive supervision (watchdog + MR + precise 4.63V threshold) essential for safety-critical embedded systems.
Availability
MAX6318LHUK46CY-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and smart energy meter subsystems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX6318LHUK46CY-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 industrial, automotive, communications, and computing markets.
The MAX6316–MAX6322 family delivers highly integrated µP supervisory circuits with factory-trimmed thresholds, configurable timeouts, and robust reset architectures for mission-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6318LHUK46CY-T?
The MAX6318LHUK46CY-T has a factory-trimmed nominal reset threshold of 4.63V, with tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in Table 1 and the Ordering Information section of the datasheet, and corresponds to the "46" suffix in the part number.
Does the MAX6318LHUK46CY-T include a watchdog timer, and what is its timeout period?
Yes, the MAX6318LHUK46CY-T includes a watchdog timer with a typical timeout period of 1.6 seconds. This is specified in the Selector Guide and Table 2 of the datasheet, and corresponds to the "Y" position in the ordering code (MAX6318LHUK46CY-T → Y = 1.6s). The timer resets on any rising or falling edge at the WDI pin.
What type of reset output does the MAX6318LHUK46CY-T provide, and how is it configured?
The MAX6318LHUK46CY-T provides an active-low, push/pull reset output on Pin 1. It actively drives LOW (≤0.4V at 3.2mA sink) and HIGH (≥0.8×VCC at 500µA source), eliminating the need for an external pullup resistor. This configuration is explicitly defined in the Pin Description table and Selector Guide for the "LH" variant.
Is the MAX6318LHUK46CY-T qualified for automotive applications?
Yes, the MAX6318LHUK46CY-T is AEC-Q100 qualified, as stated in the "Benefits and Features" section of the datasheet. This qualification covers stress testing for temperature cycling, humidity, and electrical robustness required for automotive under-hood and cabin applications.
What is the minimum reset timeout period for the MAX6318LHUK46CY-T, and how is it set?
The MAX6318LHUK46CY-T has a minimum reset timeout period of 140ms. This value is factory-programmed and corresponds to the "C" suffix in the ordering code (MAX6318LHUK46CY-T → C = 140ms), as defined in Table 3 of the datasheet. It is not user-adjustable.
MAX6318LHUK46CY-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6318LHUK46CY-T FAQ
1.How can I place an order for MAX6318LHUK46CY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK46CY-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 MAX6318LHUK46CY-T reliable?
The price and inventory of MAX6318LHUK46CY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK46CY-T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK46CY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK46CY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK46CY-T?
MAX6318LHUK46CY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK46CY-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 MAX6318LHUK46CY-T?
For technical support, including MAX6318LHUK46CY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK46CY-T requirements.
6.How does Aetrix verify that MAX6318LHUK46CY-T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK46CY-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 MAX6318LHUK46CY-T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK46CY-T?
All MAX6318LHUK46CY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK46CY-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 MAX6318LHUK46CY-T part is unused and in its original packaging.
Return procedure for MAX6318LHUK46CY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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