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Analog Devices Inc./Maxim Integrated MAX6318LHUK26AY-T
- Part No.:
- MAX6318LHUK26AY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK26AY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
MAX6318LHUK26AY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, manual reset input (MR), and watchdog timer (WDI). It features a factory-trimmed 2.63V reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout, designed for reliable power-on reset and fault recovery in embedded control systems.
For engineers reviewing the MAX6318LHUK26AY-T datasheet, MAX6318LHUK26AY-T pinout, MAX6318LHUK26AY-T application, or MAX6318LHUK26AY-T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, bidirectional reset compatibility support (via active pullup architecture), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6318LHUK26AY-T implements a precision voltage monitor with laser-trimmed resistive divider setting VRST = 2.63V ±2.5% over -40°C to +125°C, combined with a digital reset generator enforcing tRP = 140ms (min) after VCC rise. Its watchdog circuit clears on any WDI edge and times out after 1.6s (typ) if unserviced.
It integrates an active P-channel pullup with internal 4.7kΩ resistor for bidirectional reset bus compatibility - enabling fast RESET rise time (<666ns at CL = 400pF) even with multiple devices - while retaining push/pull drive capability for direct μP reset assertion without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±2.5% over -40°C to +125°C - ensures precise brownout detection at low-voltage logic rails |
| Reset Timeout Period | 140ms (min) - guarantees sufficient hold time for full microprocessor initialization |
| Watchdog Timeout | 1.6s (typ) - balances fault detection responsiveness with software execution margin |
| Supply Current | 5µA (typ) at VCC = 3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion during deep brownout down to 1V VCC |
| Package | SOT23-5 (U5+2A) - 2.9mm × 1.6mm footprint for space-constrained PCB layouts |
| AEC-Q100 Grade | Grade 3 (-40°C to +125°C) - qualified for automotive under-hood and infotainment applications |
Pinout & Package
The MAX6318LHUK26AY-T is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057, land pattern 90-0174), with thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push/pull reset output - sinks/sourses current to directly drive μP reset pin without external pullup |
| 2 | GND | Ground reference - shared return path for all internal circuits and reset assertion |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 52kΩ; debounced by 100ns glitch rejection |
| 4 | WDI | Watchdog input - edge-sensitive; resets internal timer on rising/falling transitions; disabled when left floating |
| 5 | VCC | Supply voltage input - monitored for reset generation; operates down to 1.0V with guaranteed output validity |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated 52kΩ MR pullup, 4.7kΩ RESET pullup, and laser-trimmed voltage divider eliminate BOM cost and layout area |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout - critical for fail-safe embedded controllers |
| Immunity to short negative VCC transients | Withstands ≤4µs, 100mV-under-VTH glitches without spurious reset - improves system robustness in noisy power environments |
| Fast RESET rise time | <666ns at CL = 400pF - meets timing requirements of high-speed μPs like 68HC11 with bidirectional reset buses |
| AEC-Q100 qualification | Validated for automotive temperature range and stress testing - supports deployment in ADAS, body control, and infotainment modules |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 3.3V supply rail in programmable logic controller with dual-core ARM Cortex-M7/M4. IC Role / Device Role / Timing Role: Generates 140ms power-on reset pulse and asserts watchdog-triggered reset if firmware hangs during CAN message processing. Use Value: Prevents corrupted I/O state during undervoltage events and ensures deterministic recovery from lockup without external RC network. | Use Scenario: Supervises 5V domain powering door module MCU and LIN transceivers in vehicle interior electronics. IC Role / Device Role / Timing Role: Provides AEC-Q100-compliant reset with 2.63V threshold aligned to 2.5V logic interface margin and 1.6s watchdog timeout matching firmware safety cycle. Use Value: Enables ISO 26262 ASIL-B compliant reset supervision with no additional passive components or layout overhead. |
| Portable Medical Monitor | Battery-Powered IoT Sensor Node |
Use Scenario: Ensures reliable boot sequence in handheld ECG device powered by single-cell Li-ion (2.7–4.2V). IC Role / Device Role / Timing Role: Asserts reset when battery voltage drops below 2.63V and maintains reset for 140ms after recharge, preventing partial initialization. Use Value: Eliminates risk of undefined MCU state during battery swap or deep discharge recovery - critical for FDA Class II device certification. | Use Scenario: Manages cold-start sequencing in LoRaWAN node using MSP430FR5994 with intermittent solar charging. IC Role / Device Role / Timing Role: Delivers sub-5µA quiescent current and 140ms reset hold time synchronized to ultra-low-power wake-up timer. Use Value: Extends battery life beyond 10 years by minimizing supervisory current and avoiding unnecessary reboots during transient voltage dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK26AY-T | Bidirectional (not push/pull) RESET output with active pullup; identical reset threshold, timeout, and watchdog specs | Required for μPs with bidirectional reset pins (e.g., Motorola 68HC11); incompatible with standard push/pull-only reset inputs | Select MAX6318MHUK26AY-T only when interfacing with bidirectional-reset microcontrollers; otherwise use MAX6318LHUK26AY-T for direct CMOS-compatible drive. |
| TPS3808G125DBVR | 2.5V reset threshold (vs. 2.63V), 200ms reset timeout (vs. 140ms), no manual reset input, different watchdog disable method | Lacks MR pin and has longer reset hold time - unsuitable for systems requiring user-initiated reset or tight boot timing | Choose TPS3808G125DBVR only for fixed-threshold, no-MR applications where 2.5V trip point and 200ms hold align with system requirements. |
Compared with MAX6318MHUK26AY-T, the MAX6318LHUK26AY-T provides simpler push/pull drive for conventional reset inputs, while TPS3808G125DBVR offers TI's industry-standard enable/disable control but sacrifices manual reset and precise 2.63V threshold alignment needed for legacy 2.6V logic interfaces.
Availability
MAX6318LHUK26AY-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and battery-powered IoT sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6318LHUK26AY-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 demanding industrial, automotive, and computing applications.
The MAX6316–MAX6322 family delivers highly integrated μP supervisory functions - combining reset monitoring, watchdog timing, and manual reset in miniature SOT23 packages - specifically for space- and power-constrained embedded systems requiring AEC-Q100 compliance.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK26AY-T and how tightly is it specified?
The MAX6318LHUK26AY-T has a factory-trimmed nominal reset threshold of 2.63V, specified as 2.591V (min) to 2.669V (max) at +25°C and 2.564V (min) to 2.696V (max) over -40°C to +125°C. This 2.63V value corresponds to the "26" suffix in the part number per Table 1 of the datasheet, and is laser-trimmed for precision without external calibration.
Does MAX6318LHUK26AY-T include a manual reset input, and what are its electrical characteristics?
Yes, MAX6318LHUK26AY-T includes an active-low manual reset (MR) input. It features an internal 52kΩ pullup resistor to VCC, accepts TTL/CMOS logic levels depending on supply voltage, rejects 100ns glitches, and requires only a 1µs minimum pulse width at -40°C to +85°C (1.5µs up to +125°C). MR must not be driven above VCC to avoid ESD structure damage.
What watchdog timeout period does MAX6318LHUK26AY-T provide, and how is it configured?
MAX6318LHUK26AY-T provides a typical watchdog timeout of 1.6s, corresponding to the "Y" suffix in its ordering code (per Table 3). The watchdog is edge-triggered - cleared on any rising or falling transition at WDI - and automatically disabled when WDI is left unconnected or three-stated. No configuration pins or registers are required.
Is MAX6318LHUK26AY-T compatible with bidirectional reset microcontrollers like the Motorola 68HC11?
No, MAX6318LHUK26AY-T is not compatible with bidirectional reset μPs. It features an active-low push/pull RESET output, whereas bidirectional support requires the MAX6318MHUK26AY-T variant, which includes an active pullup FET and 4.7kΩ resistor for fast rise-time bus driving. Using MAX6318LHUK26AY-T with a 68HC11 may cause incorrect reset source detection.
What package type and RoHS status does MAX6318LHUK26AY-T use?
MAX6318LHUK26AY-T uses a 5-pin SOT23 package (outline 21-0057, package code U5+2A) with lead(Pb)-free finish. The "-T" suffix denotes RoHS-compliant packaging; lead-free variants are ordered with "+T". Thermal resistance is θJA = 255.9°C/W on multilayer board, and the device is rated for -40°C to +125°C operation.
MAX6318LHUK26AY-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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6318LHUK26AY-T FAQ
1.How can I place an order for MAX6318LHUK26AY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK26AY-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 MAX6318LHUK26AY-T reliable?
The price and inventory of MAX6318LHUK26AY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK26AY-T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK26AY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK26AY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK26AY-T?
MAX6318LHUK26AY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK26AY-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 MAX6318LHUK26AY-T?
For technical support, including MAX6318LHUK26AY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK26AY-T requirements.
6.How does Aetrix verify that MAX6318LHUK26AY-T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK26AY-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 MAX6318LHUK26AY-T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK26AY-T?
All MAX6318LHUK26AY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK26AY-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 MAX6318LHUK26AY-T part is unused and in its original packaging.
Return procedure for MAX6318LHUK26AY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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