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Analog Devices Inc./Maxim Integrated MAX6318LHUK46CY
- Part No.:
- MAX6318LHUK46CY
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK46CY.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
MAX6318LHUK46CY from Maxim Integrated is an active-low, push/pull µP supervisory circuit with watchdog and manual reset functions, designed to monitor VCC and ensure reliable microprocessor reset during power-up, brownout, or software lockup. It features a 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, 1.6s typical watchdog timeout, guaranteed reset validity down to VCC = 1V, and operates in -40°C to +125°C industrial temperature range.
For engineers reviewing the MAX6318LHUK46CY datasheet, MAX6318LHUK46CY pinout, MAX6318LHUK46CY application, or MAX6318LHUK46CY equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), bidirectional compatibility support (though this variant uses push/pull), immunity to sub-4µs VCC transients, and low 5µA typical supply current at 3.6V - critical for battery-powered embedded control systems.
Technical Context
The MAX6318LHUK46CY implements a precision voltage-monitoring comparator with internal 100mV-step factory-trimmed resistive divider, enabling accurate detection of VCC falling below 4.63V. Its reset generator guarantees assertion for ≥140ms after VCC rises above threshold, independent of supply ramp rate.
Watchdog functionality clears on any WDI edge (rising or falling) with 50ns minimum pulse width detection; timeout is fixed at 1.6s (Y-suffix). Manual reset (MR) input is internally pulled up (52kΩ) and rejects ≤100ns glitches, asserting reset for full tRP upon low-to-high transition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over -40°C to +125°C - ensures reliable brownout detection for 5V systems with margin |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for microprocessor initialization sequences |
| Watchdog Timeout | 1.6s typical - balances fault detection responsiveness against false triggers in deterministic firmware |
| Supply Current | 5µA typical at 3.6V - enables multi-year operation in coin-cell–powered portable instruments |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| Reset Output Type | Active-Low, Push/Pull - drives reset line directly without external pullup; sinks/sourses current |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
MAX6318LHUK46CY is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-Low Reset Output | CMOS push/pull driver; asserts logic low when VCC < 4.63V, MR low, or watchdog times out |
| 2 - GND | Ground Reference | Primary return path for internal circuitry and output stage; must be low-impedance |
| 3 - MR | Manual Reset Input | Active-Low input; internally pulled up to VCC (52kΩ); resets system when pulled low |
| 4 - WDI | Watchdog Input | Edge-triggered input; rising or falling edge resets watchdog timer; unconnected disables watchdog |
| 5 - VCC | Supply Voltage Input | Monitored power rail; reset asserted when VCC falls below 4.63V; operates down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed Reset Threshold | 4.63V with ±2.5% tolerance over full temperature range - eliminates external resistor network and calibration |
| Guaranteed Reset Validity | Operates and asserts valid logic levels down to VCC = 1V - ensures fail-safe behavior during severe brownout |
| Immunity to VCC Transients | Rejects negative transients <4µs duration at 100mV under threshold - prevents spurious resets from switching noise |
| No External Components Required | Integrated pullup on MR, precision voltage reference, and watchdog oscillator - reduces BOM count and layout area |
| Low-Power Operation | 5µA typical ICC at 3.6V - extends battery life in always-on monitoring applications |
Applications
| Industrial PLC Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: Microcontroller-based programmable logic controllers deployed in factory automation environments subject to voltage sags and EMI. IC Role / Device Role / Timing Role: Monitors 5V system rail and asserts active-low reset to ARM Cortex-M MCU if VCC drops below 4.63V or software hangs. Use Value: Prevents corrupted I/O state and unsafe actuator commands during brownout by enforcing 140ms minimum reset hold time. | Use Scenario: Handheld blood glucose meters powered by single CR2032 coin cell, requiring ultra-low quiescent current and robust startup sequencing. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and triggers reset if supply dips during LCD backlight activation or sensor measurement. Use Value: 5µA supply current extends battery life beyond 2 years; 4.63V threshold ensures reset before analog front-end biasing fails. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Under-hood body control unit exposed to load dump and cold-crank conditions where VCC may dip to 1.2V. IC Role / Device Role / Timing Role: Provides fail-safe reset to Infineon AURIX™ MCU using active-low push/pull output compatible with automotive reset bus architecture. Use Value: Guaranteed reset assertion down to VCC = 1V prevents MCU latch-up during cold-crank; -40°C to +125°C rating meets AEC-Q100 requirements. | Use Scenario: DIN-rail mounted electricity meter with isolated RS-485 communication, requiring immunity to power-line transients and long-term reliability. IC Role / Device Role / Timing Role: Monitors auxiliary 5V supply feeding real-time clock and metrology ASIC; watchdog guards against firmware corruption from ESD events. Use Value: 1.6s watchdog timeout allows full metrology cycle completion before reset; 100ns MR glitch rejection suppresses noise from relay switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP 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 | Required for Motorola 68HC11 or other µPs needing bidirectional reset handshake capability | Select when interfacing with legacy microcontrollers that detect reset source via timing-based protocol on shared reset bus |
| TLV809E46DBZR | Single-channel, active-low open-drain reset IC with 4.63V threshold; no watchdog or manual reset | Lacks watchdog timer and MR input; requires external pullup resistor | Choose only for cost-sensitive, non-safety-critical applications where software supervision is handled externally |
Compared with MAX6318MHUK46CY-T, the MAX6318LHUK46CY offers simpler push/pull drive but lacks bidirectional timing handshake; versus TLV809E46DBZR, it adds watchdog and manual reset at modest BOM cost - making it optimal for firmware-reliability–critical embedded systems.
Availability
MAX6318LHUK46CY is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6318LHUK46CY 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 high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and computing markets.
The MAX6316–MAX6322 family was engineered specifically for robust microprocessor supervision in harsh environments - delivering precise voltage monitoring, configurable reset timing, and integrated watchdog functionality in miniature SOT23 packaging.
FAQ
What is the exact reset threshold voltage of the MAX6318LHUK46CY?
The MAX6318LHUK46CY has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 2 of the official Maxim datasheet and corresponds to the "46" suffix in the part number, referencing the 4.63V entry in the factory-trimmed threshold table. The MAX6318LHUK46CY does not require external calibration.
Does the MAX6318LHUK46CY include a watchdog timer, and what is its timeout period?
Yes, the MAX6318LHUK46CY includes a watchdog timer with a fixed typical timeout period of 1.6 seconds, corresponding to the "Y" suffix in its ordering code. The timer resets on any rising or falling edge at the WDI pin and asserts reset if no transition occurs within that interval. This behavior is fully specified in the Electrical Characteristics table and functional diagram of the MAX6318LHUK46CY datasheet.
What is the function of the MR pin on the MAX6318LHUK46CY, and how should it be used?
The MR (Manual Reset) pin on the MAX6318LHUK46CY is an active-low input that forces a system reset when pulled low. After MR transitions from low to high, the MAX6318LHUK46CY holds RESET low for the full 140ms reset timeout period. The pin features an internal 52kΩ pullup resistor, so it may be left unconnected when unused. It rejects transients ≤100ns and accepts TTL/CMOS logic levels depending on VCC.
Can the MAX6318LHUK46CY operate reliably at very low supply voltages?
Yes, the MAX6318LHUK46CY guarantees valid reset output operation down to VCC = 1.0V, meaning both RESET assertion and deassertion meet logic-level specifications even during deep brownout. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections of the MAX6318LHUK46CY datasheet and distinguishes it from many competing supervisors that fail below 2.0V.
What package type and footprint does the MAX6318LHUK46CY use?
The MAX6318LHUK46CY is supplied in a standard 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), with pin 1 marked by a dot or beveled edge. Its land pattern matches JEDEC MO-178AB, and the top-side marking "ACDH" identifies the MAX6318LHUK46CY variant. This compact footprint supports high-density PCB layouts in portable and automotive applications.
MAX6318LHUK46CY 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:
- 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 FAQ
1.How can I place an order for MAX6318LHUK46CY through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK46CY 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 reliable?
The price and inventory of MAX6318LHUK46CY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK46CY is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK46CY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK46CY transactions.
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4.How is shipping managed for MAX6318LHUK46CY?
MAX6318LHUK46CY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK46CY 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?
For technical support, including MAX6318LHUK46CY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK46CY requirements.
6.How does Aetrix verify that MAX6318LHUK46CY is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK46CY 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 meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK46CY?
All MAX6318LHUK46CY units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK46CY, 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 part is unused and in its original packaging.
Return procedure for MAX6318LHUK46CY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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