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Analog Devices Inc./Maxim Integrated MAX6318LHUK29CY-T
- Part No.:
- MAX6318LHUK29CY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK29CY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,386
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Product details
Overview
MAX6318LHUK29CY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 2.93V 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 MAX6318LHUK29CY-T datasheet, MAX6318LHUK29CY-T pinout, MAX6318LHUK29CY-T application, or MAX6318LHUK29CY-T equivalent, this device delivers guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, and integrated manual reset input - critical for portable/battery-powered equipment requiring robust power-on sequencing and watchdog supervision.
Technical Context
The MAX6318LHUK29CY-T implements a precision voltage monitor with laser-trimmed internal resistor divider setting VRST = 2.93V (±2.5% over -40°C to +125°C), paired with a digital reset timer generating 140ms minimum active-reset duration after VCC recovery. Its watchdog circuit clears on any WDI edge and times out after 1.6s if unserviced.
This variant features both MR (manual reset) and WDI (watchdog input) pins but no bidirectional or open-drain reset output - it uses an active-low CMOS push/pull RESET output capable of sourcing/sinking current, with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.7V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% (–40°C to +125°C); ensures reliable detection of VCC brownout below nominal 3.3V rail |
| Reset Timeout | 140ms min; guarantees microprocessor remains held in reset long enough for stable power and clock settling |
| Watchdog Timeout | 1.6s typ; provides sufficient margin to detect firmware hangs without false triggering during normal operation |
| Supply Current | 5µA typ at VCC = 3.6V; enables ultra-low-power operation in battery-backed systems |
| Operating Temp | –40°C to +125°C; supports industrial and automotive under-hood environments |
| VCC Range | 1.0V to 5.5V; allows valid reset assertion even during deep brownout or partial power loss |
| Reset Output Type | Active-low push/pull; eliminates need for external pullup and drives reset line directly into µP reset pin |
Pinout & Package
MAX6318LHUK29CY-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, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low CMOS push/pull output; asserts logic low during VCC undervoltage, MR assertion, or watchdog timeout |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 52kΩ; debounced by design (100ns glitch rejection) |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets internal timer on transition; disable by leaving floating |
| 5 | VCC | Power supply input; reset asserted when VCC falls below 2.93V; functional down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timer, and reset driver eliminate discrete R/C networks and reduce BOM count |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout - critical for data retention and safe shutdown |
| Immunity to short negative VCC transients | Withstands ≤4µs, 100mV-under-VTH glitches without spurious reset - improves system resilience in noisy power domains |
| AEC-Q100 qualified | Validated for automotive applications including engine control units and body electronics modules |
| Factory-trimmed precision | 2.93V threshold trimmed to ±1.5% at +25°C and ±2.5% over full temperature range - reduces calibration overhead |
Applications
| Portable/Battery-Powered Equipment | Embedded Control Systems |
|---|---|
Use Scenario: Power management in handheld medical devices with Li-ion battery and low-voltage MCU. IC Role / Device Role / Timing Role: Monitors 3.3V supply derived from buck converter; asserts reset if battery drops below 3.0V or firmware hangs. Use Value: Prevents corrupted memory writes during brownout and forces safe reboot after watchdog timeout - preserving patient data integrity. |
Use Scenario: Industrial PLC module with ARM Cortex-M4 MCU operating in harsh electrical environments. IC Role / Device Role / Timing Role: Provides power-on reset, manual reset via front-panel button, and software watchdog supervision. Use Value: 140ms reset pulse ensures clock stabilization before boot; MR debounce eliminates false triggers from EMI-coupled switch noise. |
| Intelligent Instruments | Computers |
Use Scenario: Portable oscilloscope with FPGA-based signal processing and dual-rail power (1.2V/3.3V). IC Role / Device Role / Timing Role: Supervises 3.3V I/O rail; generates synchronized reset for FPGA and MCU upon VCC fault or user-initiated reset. Use Value: Active-low push/pull output drives FPGA PROG_B and MCU nRST simultaneously without level-shifting or external drivers. |
Use Scenario: Compact fanless mini-PC using x86 SoC with strict power sequencing requirements. IC Role / Device Role / Timing Role: Acts as primary supervisor for 5V standby and 3.3V main rails; integrates MR for BIOS recovery button. Use Value: 2.93V threshold aligns with 3.3V rail tolerance; 1.6s watchdog timeout accommodates BIOS POST delays without premature reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316LUK29CY-T | Lacks watchdog function; identical 2.93V threshold and 140ms reset timeout | Suitable where software hang detection is unnecessary; lower complexity and cost | Select when watchdog supervision adds no value and BOM simplification is prioritized |
| TPS3808G125DBVR | 2.5V reset threshold, 200ms timeout, no manual reset input; TI's nano-power supervisor | Better suited for ultra-low-power IoT sensors; lacks MR and WDI pins | Choose for battery life-critical designs where 2.5V threshold matches system rail and manual reset is omitted |
Compared with MAX6318LHUK29CY-T, MAX6316LUK29CY-T removes watchdog capability while retaining identical reset behavior - ideal for cost-sensitive, non-watchdog applications; TPS3808G125DBVR offers lower quiescent current but sacrifices MR/WDI flexibility and requires redesign for 2.5V threshold alignment.
Availability
MAX6318LHUK29CY-T is available at Aetrix Electronics and suitable for portable computers, embedded control systems, and intelligent instruments requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX6318LHUK29CY-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, emphasizing reliability, integration, and thermal robustness.
The MAX6316–MAX6322 family was engineered specifically for microprocessor reset supervision in space-constrained, high-reliability systems - delivering factory-trimmed thresholds, multiple timeout options, and AEC-Q100 qualification in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK29CY-T and how stable is it over temperature?
The MAX6318LHUK29CY-T has a factory-trimmed nominal reset threshold of 2.93V, specified as ±1.5% at +25°C and ±2.5% over the full –40°C to +125°C operating range. Its temperature coefficient is 40ppm/°C, ensuring predictable drift and eliminating need for external calibration in most embedded applications.
Does MAX6318LHUK29CY-T include manual reset and watchdog functionality?
Yes, MAX6318LHUK29CY-T includes both a manual reset (MR) input and a watchdog input (WDI). MR is active-low with internal 52kΩ pullup and 100ns glitch rejection; WDI is edge-triggered and resets the watchdog timer on any rising or falling transition - enabling flexible firmware supervision without additional logic.
What is the reset output configuration of MAX6318LHUK29CY-T and can it drive a standard microcontroller reset pin directly?
MAX6318LHUK29CY-T features an active-low push/pull reset output capable of sinking 1.2mA at VCC ≥ 2.7V (VOL ≤ 0.3V) and sourcing 500µA (VOH ≥ 0.8×VCC). This allows direct connection to standard µP reset inputs - no external pullup resistor or level shifter is required.
How does MAX6318LHUK29CY-T behave during severe VCC brownout - down to what voltage does it guarantee valid reset assertion?
MAX6318LHUK29CY-T guarantees valid reset output down to VCC = 1.0V, meaning the RESET pin remains a well-defined logic low (≤0.3V) even as supply collapses. This ensures deterministic behavior during deep brownout events where other supervisors may release reset prematurely.
Is MAX6318LHUK29CY-T qualified for automotive applications and what packaging options are available?
Yes, MAX6318LHUK29CY-T is AEC-Q100 qualified for automotive use. It is supplied in a lead-free 5-pin SOT23 package (U5+2A outline), with top marking "ACDH". The "-T" suffix denotes tape-and-reel packaging; lead-free versions use "+T" per Maxim ordering conventions.
MAX6318LHUK29CY-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:
- 2.93V
- 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
MAX6318LHUK29CY-T FAQ
1.How can I place an order for MAX6318LHUK29CY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK29CY-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 MAX6318LHUK29CY-T reliable?
The price and inventory of MAX6318LHUK29CY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK29CY-T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK29CY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK29CY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK29CY-T?
MAX6318LHUK29CY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK29CY-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 MAX6318LHUK29CY-T?
For technical support, including MAX6318LHUK29CY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK29CY-T requirements.
6.How does Aetrix verify that MAX6318LHUK29CY-T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK29CY-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 MAX6318LHUK29CY-T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK29CY-T?
All MAX6318LHUK29CY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK29CY-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 MAX6318LHUK29CY-T part is unused and in its original packaging.
Return procedure for MAX6318LHUK29CY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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