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Analog Devices Inc./Maxim Integrated MAX6315US31D2
- Part No.:
- MAX6315US31D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6315US31D2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
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Product details
Overview
MAX6315US31D2 from Maxim Integrated is a low-power, open-drain microprocessor reset supervisor IC designed to monitor VCC supply voltage and assert a reset signal during power-up, brownout, or manual reset events. It features a factory-trimmed 3.08V reset threshold, 20ms minimum reset timeout period, 5µA supply current, -40°C to +125°C operating temperature range, and SOT143-4 package. It is used in portable battery-powered equipment requiring reliable, low-quiescent-current power monitoring.
For engineers reviewing the MAX6315US31D2 datasheet, MAX6315US31D2 pinout, MAX6315US31D2 application, or MAX6315US31D2 equivalent, key selection considerations include its precise 3.08V threshold tolerance (±1.8%), immunity to short VCC transients (<1µs rejection at 10mV overdrive), open-drain RESET output capable of level-shifting above VCC (up to +6V), guaranteed operation over industrial temperature, and compatibility with µP systems requiring debounced manual reset input.
Technical Context
The MAX6315US31D2 implements a precision voltage-monitoring comparator with laser-trimmed internal resistors to set the 3.08V nominal reset threshold, with ±1.8% accuracy over temperature. Its internal timer generates a fixed 20ms (min) reset pulse width after VCC rises above threshold or MR deasserts.
It uses an open-drain n-channel MOSFET for the RESET output, enabling pull-up to any voltage between 0V and +6V - independent of VCC - supporting level-shifted reset signaling across mixed-supply systems. The MR input includes a 63kΩ internal pullup and accepts logic-low manual reset pulses without external debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±1.8% over -40°C to +125°C - ensures accurate brownout detection for 3.3V systems |
| Reset Timeout Period | 20ms minimum - guarantees sufficient reset assertion time for microcontroller initialization |
| Supply Current | 5µA typical at +25°C - enables ultra-low-power operation in battery-backed applications |
| Operating Temperature | -40°C to +125°C - supports industrial and automotive under-hood environments |
| RESET Output Type | Open-drain, rated to +6V - allows pull-up to higher-voltage rails (e.g., 5V) while monitoring 3.3V VCC |
| MR Input | Logic-low active with 63kΩ internal pullup - eliminates need for external resistor; supports momentary switch to GND |
| VCC Operating Range | 1.0V to 5.5V - ensures valid reset assertion down to 1V, critical for deep brownout detection |
Pinout & Package
SOT143-4 surface-mount package (4-pin, 1.3mm × 2.9mm footprint), lead(Pb)-free compatible, tape-and-reel delivery only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal circuitry and RESET sink current; must be low-impedance connection |
| 2 (RESET) | Active-low open-drain output | Sinks current when asserted; requires external pullup (e.g., 10kΩ) to target reset rail (≤+6V) |
| 3 (MR) | Manual reset input | Logic-low assertion forces RESET active; internally pulled up to VCC (63kΩ); floats high if unused |
| 4 (VCC) | Supply and monitored voltage input | Power source and reset threshold reference; monitored continuously; valid down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed threshold | 3.08V ±1.8% over full temperature range - eliminates calibration and external resistor networks |
| Four standard timeout options | 20ms min timeout (this variant) - matches typical µP reset hold requirements without overspecifying delay |
| Open-drain RESET with >VCC capability | Supports level-shifted reset signaling (e.g., 3.3V VCC → 5V RESET rail) - simplifies multi-rail system design |
| Debounced manual reset input | Internal 63kΩ pullup + glitch rejection (100ns MR pulse rejection) - removes need for RC filters or logic gates |
| Ultra-low quiescent current | 5µA max at +25°C - extends battery life in always-on supervisory applications |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools requiring long shelf life and reliable cold-start behavior. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset until 3.08V VCC is stable, then holding reset for ≥20ms to ensure MCU core and peripherals initialize fully. Use Value: 5µA supply current minimizes standby drain; ±1.8% threshold ensures consistent trip point across temperature swings encountered in field use. |
Use Scenario: DIN-rail mounted programmable logic controllers exposed to wide ambient temperatures and noisy 24V DC supplies. IC Role / Device Role / Timing Role: Brownout detector monitoring 3.3V logic rail derived from switched-mode power supply; asserts reset on dips below 3.08V. Use Value: Guaranteed operation to +125°C and immunity to <1µs transients prevent spurious resets in electrically harsh factory environments. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: ANSI C12.20-compliant electricity meters with backup supercapacitors and dual-supply microcontrollers. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and triggers controlled shutdown/reset when primary supply fails and backup takes over. Use Value: Open-drain RESET pulled up to 5V microcontroller reset pin enables clean handoff between supply domains without level translators. |
Use Scenario: Under-dash body control units powered from vehicle battery (9V–16V), regulating local 3.3V domain for CAN microcontrollers. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts reset during cranking-induced brownouts (e.g., 6V battery sag). Use Value: 3.08V threshold aligns with 3.3V rail dropout margin; 20ms timeout exceeds ISO 16750-2 pulse 4a requirement for reset hold duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US31D1-T | Same 3.08V threshold and SOT143 package, but 1ms reset timeout (vs. 20ms) | Suitable for fast-boot µPs where minimal reset hold time is required | Select D1 for speed-critical applications; D2 preferred when longer reset assertion improves system reliability |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V), push-pull RESET output, 2% threshold accuracy, 20ms timeout option available | Requires VCC-referenced pullup; lacks >VCC level-shifting capability | Choose if system uses only single-supply reset signaling and tighter 3.3V margin is acceptable |
Compared with MAX6315US31D1-T (1ms timeout) and TPS3808G33DBVR (3.3V push-pull), the MAX6315US31D2 offers the unique combination of precise 3.08V detection, 20ms industrial-grade timing, and open-drain level-shifting - making it optimal for robust, multi-rail embedded systems where brownout response consistency and supply-domain isolation matter.
Availability
MAX6315US31D2 is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6315US31D2 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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX6315 family delivers highly accurate, low-power reset supervision for microprocessor-based systems - engineered specifically for applications demanding guaranteed reset behavior across extreme temperatures and noisy supply conditions.
FAQ
What is the exact reset threshold voltage for MAX6315US31D2, and how tightly is it specified?
The MAX6315US31D2 has a nominal reset threshold of 3.08V, with guaranteed accuracy of ±1.8% over the full -40°C to +125°C operating temperature range. This specification is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table under "Reset Threshold (Note 1)" with min/max limits of VTH – 1.8% and VTH + 1.8%. The 3.08V value is selected to provide appropriate margin below standard 3.3V rails while avoiding false trips during normal operation.
Does MAX6315US31D2 support manual reset functionality, and what are the interface requirements?
Yes, MAX6315US31D2 includes a dedicated MR (manual reset) input (Pin 3) that is logic-low active. It features an internal 63kΩ pullup resistor, so the pin can be left floating if unused. To activate manual reset, connect a normally open momentary switch from MR to GND. No external debounce components are needed due to built-in 100ns glitch rejection. The MR-to-RESET propagation delay is guaranteed ≤500ns, ensuring immediate response to operator-initiated resets.
Can the RESET output of MAX6315US31D2 be pulled up to a voltage higher than its VCC supply?
Yes, the RESET output of MAX6315US31D2 is an open-drain n-channel MOSFET rated for voltages up to +6.0V - independent of the VCC supply voltage. This allows the RESET signal to be pulled up to a higher-voltage rail (e.g., 5V) while monitoring a lower VCC (e.g., 3.3V), enabling level-shifted reset signaling across mixed-supply systems without additional translators. The absolute maximum rating for RESET is +6.0V, and the output leakage current remains ≤0.4µA at +6V.
What is the guaranteed reset timeout period for MAX6315US31D2, and how does temperature affect it?
The MAX6315US31D2 provides a minimum reset timeout period of 20ms after VCC rises above the 3.08V threshold or after MR is deasserted. Over temperature, the normalized timeout remains within ±3% of nominal across -40°C to +125°C, as shown in Figure MAX6315-04. This stability ensures predictable reset hold time regardless of ambient conditions - critical for reliable microcontroller initialization in industrial and automotive applications.
Is MAX6315US31D2 compatible with systems requiring operation down to very low VCC levels?
Yes, MAX6315US31D2 guarantees valid reset assertion down to VCC = 1.0V, as specified in the Electrical Characteristics table ("RESET Output Voltage" and "VCC Supply Current" rows). Below 1.0V, the device may not reliably sink RESET current, but above 1.0V - including during deep brownout recovery - RESET remains a solid logic-low. This capability supports robust power-fail detection in battery-powered systems where supply voltage decays gradually.
MAX6315US31D2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6315US31D2 FAQ
1.How can I place an order for MAX6315US31D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6315US31D2 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 MAX6315US31D2 reliable?
The price and inventory of MAX6315US31D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6315US31D2 is usually 5 days.
3.What payment methods are accepted for MAX6315US31D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6315US31D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6315US31D2?
MAX6315US31D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6315US31D2 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 MAX6315US31D2?
For technical support, including MAX6315US31D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6315US31D2 requirements.
6.How does Aetrix verify that MAX6315US31D2 is sourced from the original manufacturer or authorized distributors?
All MAX6315US31D2 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 MAX6315US31D2 meets industry standards.
7.What is the process for return or replacement of MAX6315US31D2?
All MAX6315US31D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6315US31D2, 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 MAX6315US31D2 part is unused and in its original packaging.
Return procedure for MAX6315US31D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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