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Analog Devices Inc./Maxim Integrated MAX6318LHUK31AY
- Part No.:
- MAX6318LHUK31AY
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK31AY.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:729
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Product details
Overview
MAX6318LHUK31AY from Maxim Integrated is an active-low, push/pull µP supervisory circuit with integrated watchdog timer and manual reset input, designed to monitor VCC supply integrity and microprocessor activity in embedded systems. It features a factory-trimmed 3.1V reset threshold (±2.5%), 140ms minimum reset timeout, 1.6s typical watchdog timeout, and guaranteed reset validity down to VCC = 1V. It is used in industrial controllers and battery-powered instrumentation for reliable power-on reset and software fault recovery.
For engineers reviewing the MAX6318LHUK31AY datasheet, MAX6318LHUK31AY pinout, MAX6318LHUK31AY application, or MAX6318LHUK31AY equivalent, this page provides verified functional specifications, SOT23-5 pin mapping, real-world use scenarios, and two validated alternative parts for design flexibility under varying reset voltage and timeout requirements.
Technical Context
The MAX6318LHUK31AY implements a dual-monitoring architecture: a precision voltage detector triggers reset when VCC falls below 3.1V, while a programmable watchdog timer asserts reset if the WDI input remains static beyond 1.6s. Its push/pull output drives RESET low actively and pulls it high with CMOS strength, eliminating external pullup components.
It integrates internal 52kΩ MR pullup and supports bidirectional timing coordination via WDI edge detection (rising/falling), with glitch rejection on MR (≥100ns) and immunity to sub-4µs negative VCC transients. The device operates across -40°C to +125°C and draws only 5–12µA at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.1V ±2.5% over -40°C to +125°C - ensures accurate brownout detection for 3.3V systems |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for processor initialization sequences |
| Watchdog Timeout | 1.6s typical - balances fault detection responsiveness with software execution margin |
| Supply Current | 5µA at VCC = 3.6V - enables ultra-low-power operation in battery-backed applications |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| RESET Output Type | Active-low, push/pull CMOS - drives low and high without external components; VOL ≤0.3V at 1.2mA |
| MR Input Threshold | VIL ≤0.3×VCC, VIH ≥0.7×VCC - compatible with 3.3V and 5V logic families without level shifting |
Pinout & Package
MAX6318LHUK31AY is housed in a lead-free 5-pin SOT23 package (JEDEC MO-178AA), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height - optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for all internal circuits; must be connected to system ground plane |
| 2 - WDI | Watchdog input | Edge-sensitive trigger; reset asserted if no transition occurs within 1.6s; accepts 50ns pulses |
| 3 - MR | Manual reset input | Active-low; internal 52kΩ pullup; reset held for full 140ms after MR release |
| 4 - VCC | Supply voltage input | Monitored rail; reset asserted when VCC drops below 3.1V; operates down to 1.0V |
| 5 - RESET | Active-low reset output | Push/pull CMOS; sinks 1.2mA / sources 500µA; valid logic levels guaranteed to VCC = 1V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.1V reset threshold | Eliminates external resistor divider; achieves ±2.5% accuracy over full temperature range |
| 140ms minimum reset timeout | Ensures reliable processor boot sequence completion before firmware execution begins |
| 1.6s watchdog timeout period | Provides deterministic software hang detection without requiring CPU clock dependency |
| Guaranteed reset validity to VCC = 1V | Enables fail-safe reset assertion during severe brownout, preventing undefined MCU states |
| No external components required | Integrates MR pullup, precision voltage reference, and push/pull driver - reduces BOM count by 3–5 parts |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power-up sequencing and runtime watchdog supervision in DIN-rail mounted PLCs operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Primary reset supervisor ensuring deterministic boot and detecting firmware lockups during analog I/O scanning cycles. Use Value: Prevents spurious resets from EMI-induced VCC dips using 4µs transient immunity, while 140ms timeout aligns with Modbus RTU initialization timing. |
Use Scenario: Battery-powered ECG and pulse oximeter devices requiring low-quiescent-current supervision during sleep/wake transitions. IC Role / Device Role / Timing Role: Low-power reset manager that maintains valid reset state down to 1.0V VCC and consumes only 5µA during standby. Use Value: Extends battery life by minimizing supply current; 3.1V threshold matches Li-ion cell discharge profile, triggering reset before data corruption occurs. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Reset coordination in non-critical automotive subsystems (e.g., lighting control, HVAC interface) exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervisory guardrail that asserts reset during VCC sag below 3.1V and recovers cleanly post-transient. Use Value: Immunity to 200ns negative VCC glitches prevents false resets during alternator switching; -40°C to +125°C rating meets AEC-Q100 Grade 2 requirements. |
Use Scenario: Tamper-resistant metering platforms where firmware integrity must be verified after power restoration following grid outages. IC Role / Device Role / Timing Role: Dual-trigger supervisor combining VCC monitoring and software watchdog to detect both hardware faults and malicious code injection. Use Value: 1.6s watchdog timeout enables verification of secure boot chain execution; MR pin allows field-service forced reset without opening enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK31AY | Bidirectional (not push/pull) RESET output; includes active P-channel pullup for Motorola 68HC11 compatibility | Required when interfacing with µPs having bidirectional reset pins needing fast rise-time under capacitive bus loading | Select when system uses 68HC11-family processors or multi-device reset buses exceeding 120pF total capacitance |
| TLV809K31DBVR | Single-function reset IC (no watchdog or MR); 3.08V threshold; 200ms timeout; SOT23-3 package | Lacks watchdog and manual reset - suitable only for basic power-monitoring applications without software supervision | Choose when design requires lowest cost/size and watchdog/MR functionality is implemented elsewhere in firmware or hardware |
Compared with MAX6318LHUK31AY, MAX6318MHUK31AY adds bidirectional timing coordination for legacy µPs but removes independent RESET drive capability, while TLV809K31DBVR reduces feature set and package size at the cost of losing critical fault-detection redundancy.
Availability
MAX6318LHUK31AY is available at Aetrix Electronics and suitable for industrial controllers, portable medical monitors, automotive body electronics, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6318LHUK31AY 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, and computing applications, with emphasis on reliability, low power, and integration.
The MAX6316–MAX6322 family delivers compact, factory-configured supervisory solutions targeting embedded systems needing robust power monitoring, watchdog safety, and manual reset - all in a 5-pin SOT23 footprint.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK31AY?
The MAX6318LHUK31AY has a factory-trimmed nominal reset threshold of 3.1V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 1 and Electrical Characteristics section of the official datasheet, and corresponds to the "31" suffix in the part number per Maxim's ordering guide.
Does MAX6318LHUK31AY include a watchdog timer, and what is its timeout period?
Yes, MAX6318LHUK31AY includes a watchdog timer with a typical timeout period of 1.6 seconds, corresponding to the "Y" suffix in its full ordering code. The watchdog clears on any WDI edge (rising or falling) and asserts reset if unattended beyond this interval - verified in Table 3 and Electrical Characteristics.
What is the function of the MR pin on MAX6318LHUK31AY, and how is it biased?
The MR (Manual Reset) pin on MAX6318LHUK31AY is an active-low input with an internal 52kΩ pullup resistor to VCC. Pulling MR low forces a reset that remains asserted for the full 140ms timeout period after MR returns high. It accepts TTL/CMOS logic levels and rejects transients ≥100ns - specified in Pin Description and Electrical Characteristics.
Can MAX6318LHUK31AY operate reliably at low supply voltages?
Yes, MAX6318LHUK31AY guarantees valid reset output behavior down to VCC = 1.0V, including proper RESET logic levels and internal circuit functionality. This is explicitly stated in Absolute Maximum Ratings and Electrical Characteristics, enabling safe operation during deep brownout conditions.
What package type and pin configuration does MAX6318LHUK31AY use?
MAX6318LHUK31AY uses a 5-pin SOT23 package (JEDEC MO-178AA) with standard pinout: Pin 1 = GND, Pin 2 = WDI, Pin 3 = MR, Pin 4 = VCC, Pin 5 = RESET. This layout is confirmed in the "Pin Configurations" diagram (page 12) and "Ordering Information" tables of the datasheet.
MAX6318LHUK31AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6318LHUK31AY FAQ
1.How can I place an order for MAX6318LHUK31AY through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK31AY 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 MAX6318LHUK31AY reliable?
The price and inventory of MAX6318LHUK31AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK31AY is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK31AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK31AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK31AY?
MAX6318LHUK31AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK31AY 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 MAX6318LHUK31AY?
For technical support, including MAX6318LHUK31AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK31AY requirements.
6.How does Aetrix verify that MAX6318LHUK31AY is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK31AY 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 MAX6318LHUK31AY meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK31AY?
All MAX6318LHUK31AY units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK31AY, 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 MAX6318LHUK31AY part is unused and in its original packaging.
Return procedure for MAX6318LHUK31AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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