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Analog Devices Inc./Maxim Integrated MAX6315US31D4-T
- Part No.:
- MAX6315US31D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6315US31D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,467
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Product details
Overview
MAX6315US31D4-T from Analog Devices is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an open-drain reset signal when voltage falls below 3.08V or upon manual reset assertion. It provides a guaranteed minimum 1120ms reset timeout period over -40°C to +125°C, consumes only 5μA typical supply current at 5.5V, and operates across 1.0V–5.5V VCC range. It is used in battery-powered controllers and critical μP systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6315US31D4-T datasheet, MAX6315US31D4-T pinout, MAX6315US31D4-T application, or MAX6315US31D4-T equivalent, key selection criteria include factory-trimmed 3.08V reset threshold, 1120ms min timeout at full temperature range, open-drain RESET output compatible with voltages up to 6V, SOT23-4 package footprint, and immunity to sub-100ns MR glitches.
Technical Context
The MAX6315US31D4-T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider setting nominal VTH = 3.08V ±3.5% over -40°C to +125°C, and integrates a monolithic timer circuit that guarantees ≥1120ms reset assertion after VCC recovery or MR deassertion. Its open-drain RESET output uses an n-channel MOSFET capable of sinking ≥3.2mA at VCC > 4.25V while allowing pullup to any voltage ≤6V - enabling level-shifted reset signaling across mixed-supply systems.
MR input includes a 63kΩ internal pullup resistor and rejects transients <100ns; it drives reset active as long as MR is low and sustains timeout after release. The device draws only 5μA (typ) at 5.5V and remains functional down to VCC = 1.0V, ensuring reset assertion during deep brownout conditions before system collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.08V ±3.5% over -40°C to +125°C - ensures reliable detection of 3.3V rail brownout before logic failure |
| Reset Timeout Period | 1120ms minimum at -40°C to +125°C - guarantees sufficient processor initialization time after power recovery |
| VCC Supply Current | 5μA typical at 5.5V - enables multi-year operation in coin-cell–powered portable instruments |
| RESET Output Type | Open-drain n-MOSFET - supports pullup to 6V, enabling reset signaling across 3.3V/5V domain boundaries |
| MR Input Glitch Rejection | 100ns - suppresses EMI-induced false resets without external RC filtering |
| Operating Voltage Range | 1.0V to 5.5V - functions through full discharge of single Li-ion or dual alkaline cells |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
MAX6315US31D4-T is housed in a RoHS-compliant 4-pin SOT23 package (outline 21-0052), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and 0.95mm pitch. The package supports reflow soldering per JEDEC J-STD-020 and is rated for 300°C peak solder temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground return | Must be connected directly to system power ground plane; serves as analog reference for internal voltage comparator |
| RESET (Pin 2) | Active-low open-drain reset output | Sinks current when asserted; requires external pullup (e.g., 10kΩ) to target reset rail (≤6V); remains valid down to VCC = 1.0V |
| MR (Pin 3) | Manual reset input | Logic-low assertion forces reset; internally pulled up to VCC via 63kΩ; accepts 1μs minimum pulse width |
| VCC (Pin 4) | Supply and monitored voltage input | Power source and reset threshold reference; monitored internally via laser-trimmed resistor divider; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±3.5% tolerance over full temperature range - eliminates calibration components and improves BOM consistency |
| Guaranteed 1120ms reset timeout | Minimum duration at -40°C to +125°C - ensures μP core and peripherals fully stabilize before release |
| Open-drain RESET with 6V tolerance | Allows pullup to higher-voltage rails (e.g., 5V) while monitoring 3.3V VCC - simplifies mixed-supply reset sequencing |
| 5μA max supply current | Enables use in always-on battery-backed subsystems with >10-year shelf life |
| MR glitch rejection & internal pullup | 100ns noise immunity and 63kΩ internal pullup - removes need for external debounce or pullup resistors |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers operating in unregulated factory environments with wide ambient temperature swings and noisy 24V DC supplies. IC Role / Device Role / Timing Role: Supervisory circuit monitoring 3.3V logic rail derived from buck converter; asserts reset during line sags or cold starts. Use Value: Prevents firmware corruption by guaranteeing ≥1120ms reset hold time even at +125°C junction temperature, meeting IEC 61000-4-29 immunity requirements. |
Use Scenario: Remote environmental sensors powered by AA batteries, transmitting data every 15 minutes with ultra-low sleep current. IC Role / Device Role / Timing Role: Power-on and brownout detector for ARM Cortex-M0+ MCU; triggers hardware reset if battery voltage drops below 3.08V during wake-up. Use Value: 5μA quiescent current extends battery life beyond 5 years; open-drain RESET allows direct interface to MCU's 1.8V reset pin via 10kΩ pullup to 1.8V rail. |
| Automotive Body Control Modules | Medical Point-of-Care Monitors |
Use Scenario: Under-dash electronics exposed to -40°C winter starts and +105°C engine-bay radiated heat, powered from vehicle battery via LDO. IC Role / Device Role / Timing Role: Resets microcontroller during cranking-induced 6V dips; debounces MR from mechanical ignition switch. Use Value: Guaranteed operation at -40°C to +125°C and 100ns MR glitch rejection prevent spurious resets during engine start transient events. |
Use Scenario: Portable vital-sign monitors using rechargeable Li-ion with fuel-gauge IC and real-time clock, requiring fail-safe boot integrity. IC Role / Device Role / Timing Role: Primary reset supervisor for safety-critical ARM-based SoC; monitors main 3.3V rail and asserts reset on undervoltage or user-initiated MR. Use Value: Factory-trimmed 3.08V threshold matches 3.3V rail tolerance band; 1120ms timeout satisfies FDA Class II boot validation timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US31D3-T | Same 3.08V threshold but 140ms min timeout (vs. 1120ms) | Suitable for faster-booting MCUs where extended reset hold is unnecessary | Select when system initialization completes in <200ms and lower timeout reduces boot latency |
| TPS3808G33DBVR | 3.3V threshold (±0.5%), 200ms timeout, push-pull RESET, 1.4μA IQ | Requires separate pullup not needed; tighter threshold accuracy but no 3.08V option | Choose for ultra-low-power designs needing 3.3V rail monitoring with highest accuracy, accepting push-pull limitation |
Compared with MAX6315US31D3-T, the MAX6315US31D4-T provides eight times longer reset hold time for robust initialization of complex peripherals; versus TPS3808G33DBVR, it offers exact 3.08V trip point and open-drain flexibility at higher quiescent current, making it preferable for mixed-rail systems requiring level shifting.
Availability
MAX6315US31D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, automotive body control modules, and medical point-of-care monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6315US31D4-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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX6315 series belongs to Analog Devices' precision supervisory IC product line, engineered specifically for reliable power-monitoring and reset generation in resource-constrained embedded systems operating across harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of the MAX6315US31D4-T?
The MAX6315US31D4-T has a factory-trimmed nominal reset threshold voltage of 3.08V, with tolerance of ±3.5% over the full operating temperature range of -40°C to +125°C. This value is laser-trimmed during manufacturing and specified in the Electrical Characteristics table under "Reset Threshold (VTH)" with test conditions confirming stability across voltage and temperature extremes.
Does the MAX6315US31D4-T require an external pullup resistor on the RESET pin?
Yes, the MAX6315US31D4-T features an open-drain RESET output and requires an external pullup resistor to establish a valid high-level signal. A 10kΩ resistor pulled to any voltage between 0V and 6V is recommended; the device's RESET pin can safely interface with higher-voltage rails than its own VCC, enabling level-shifted reset signaling in multi-supply systems.
What is the minimum reset timeout period for the MAX6315US31D4-T across temperature?
The MAX6315US31D4-T guarantees a minimum reset timeout period of 1120ms over the full industrial temperature range of -40°C to +125°C. This value is confirmed in the Electrical Characteristics table under "Reset Timeout Period (tRP)" for part suffix D4-T, and applies whether reset is triggered by VCC recovery or MR deassertion.
Can the MAX6315US31D4-T monitor a 1.8V supply rail?
No - the MAX6315US31D4-T is factory-trimmed for a 3.08V reset threshold and cannot reliably monitor 1.8V rails. Its operating VCC range is 1.0V to 5.5V, but the internal voltage-divider network is fixed for 3.08V detection. For 1.8V supervision, select a variant such as MAX6315US18D4-T (if available) or consider alternative supervisors like the TPS3808G18.
Is the MR pin of the MAX6315US31D4-T internally pulled up, and what is its resistance value?
Yes, the MR pin of the MAX6315US31D4-T includes an internal pullup resistor with a nominal value of 63kΩ, as specified in the Electrical Characteristics table under "MR Pullup Resistance". This allows the pin to be left floating when unused, eliminating the need for an external pullup; a momentary switch to GND suffices for manual reset functionality.
MAX6315US31D4-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6315US31D4-T FAQ
1.How can I place an order for MAX6315US31D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6315US31D4-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 MAX6315US31D4-T reliable?
The price and inventory of MAX6315US31D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6315US31D4-T is usually 5 days.
3.What payment methods are accepted for MAX6315US31D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6315US31D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6315US31D4-T?
MAX6315US31D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6315US31D4-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 MAX6315US31D4-T?
For technical support, including MAX6315US31D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6315US31D4-T requirements.
6.How does Aetrix verify that MAX6315US31D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6315US31D4-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 MAX6315US31D4-T meets industry standards.
7.What is the process for return or replacement of MAX6315US31D4-T?
All MAX6315US31D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6315US31D4-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 MAX6315US31D4-T part is unused and in its original packaging.
Return procedure for MAX6315US31D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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