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Analog Devices Inc./Maxim Integrated MAX6315US29D3+T
- Part No.:
- MAX6315US29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6315US29D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:6,467
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Product details
Overview
MAX6315US29D3+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 2.93V or upon manual reset assertion. It provides a guaranteed 140ms (min) reset timeout period, consumes only 5μA typical supply current at 5.5V, and operates across -40°C to +125°C for use in battery-powered industrial controllers and embedded systems.
For engineers reviewing the MAX6315US29D3+T datasheet, MAX6315US29D3+T pinout, MAX6315US29D3+T application, or MAX6315US29D3+T equivalent, key selection criteria include factory-trimmed 2.93V reset threshold accuracy (±3.5% over full temperature range), immunity to sub-100ns MR glitches, open-drain RESET output capable of level-shifting up to +6V, and SOT23-4 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6315US29D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 2.93V nominal reset threshold, with ±3.5% tolerance over -40°C to +125°C and 60ppm/°C tempco. Its internal monostable timer generates a minimum 140ms reset pulse after VCC recovery or MR deassertion.
It features an integrated 63kΩ MR pullup resistor, supports manual reset input with 1μs minimum pulse width and 100ns glitch rejection, and guarantees RESET sink capability down to VCC = 1.0V (0.3V VOL at 80μA). The open-drain output allows interfacing with logic supplies independent of VCC - e.g., pulling RESET to +3.3V while monitoring a +2.5V rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±3.5% over -40°C to +125°C - ensures reliable brownout detection for 3.0V nominal systems |
| Reset Timeout Period | 140ms (min) - holds μP in reset long enough for power stabilization and clock lock |
| Supply Current | 5μA typical at 5.5V - enables multi-year operation in coin-cell–powered IoT sensors |
| MR Input Logic | VIL ≤0.3×VCC, VIH ≥0.7×VCC - compatible with standard CMOS logic driving manual reset |
| RESET Output Type | Open-drain n-MOS - permits level-shifting; supports pullup to any voltage ≤6V, independent of VCC |
| Operating Temp Range | -40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
| VCC Range | 1.0V to 5.5V - functions during deep brownout and supports wide-input power architectures |
Pinout & Package
MAX6315US29D3+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 optimized for reflow soldering and high-density layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal comparator and reset timer; must be connected directly to system ground plane |
| RESET (Pin 2) | Active-low open-drain output | Sinks current when asserted; requires external pullup (e.g., 10kΩ) to logic supply; can interface across voltage domains |
| MR (Pin 3) | Manual reset input | Logic-low active; includes 63kΩ internal pullup; debounced internally - no external RC needed |
| VCC (Pin 4) | Supply and monitor input | Power source and monitored rail; internal divider samples this node to detect undervoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed threshold | 2.93V reset point set via laser trimming - eliminates external resistor networks and calibration effort |
| Four selectable timeout options | 140ms minimum delay ensures sufficient hold time for slow-ramping supplies and PLL lock in μP systems |
| Immunity to short VCC transients | Rejects <100ns noise spikes - prevents spurious resets in electrically noisy motor drive or switching PSU environments |
| Open-drain RESET with >VCC capability | Enables reset signaling to higher-voltage logic domains (e.g., +3.3V RESET line monitoring +2.5V core rail) |
| Guaranteed operation over temperature | Full -40°C to +125°C specification - validated for extended life in sealed industrial enclosures without derating |
Applications
| Industrial PLC I/O Modules | Battery-Powered Wireless Sensors |
|---|---|
Use Scenario: Monitoring 3.3V I/O power rail in programmable logic controller modules exposed to 125°C ambient temperatures. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during brownout caused by shared 24V DC-DC converter ripple or load dump. Use Value: Prevents firmware corruption by holding CPU in reset until rail stabilizes above 2.93V and remains valid for ≥140ms. | Use Scenario: Long-life environmental sensor node powered by CR2032 coin cell, requiring ultra-low quiescent current and reliable cold-start behavior. IC Role / Device Role / Timing Role: Voltage supervisor ensuring microcontroller only exits reset after stable 3.0V rail is established post-battery insertion. Use Value: 5μA supply current extends battery life beyond 10 years; 2.93V threshold matches typical LiMnO₂ discharge profile. |
| Automotive Body Control Units | Medical Infusion Pump Controllers |
Use Scenario: Reset management in under-dash BCM modules subject to load-dump transients and thermal cycling. IC Role / Device Role / Timing Role: Monitors 5.0V system rail derived from automotive 12V supply; asserts reset during cranking-induced brownout. Use Value: ±3.5% threshold tolerance and 125°C rating ensure deterministic reset behavior across full vehicle lifecycle. | Use Scenario: Safety-critical reset supervision in portable infusion pumps where firmware integrity is mandated by IEC 62304. IC Role / Device Role / Timing Role: Primary reset source for ARM Cortex-M4 MCU; provides fail-safe restart on power anomaly or user-initiated reset. Use Value: MR input with internal pullup simplifies BOM; 140ms timeout satisfies FDA-recommended minimum reset duration for medical firmware recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US29D3+T | Bidirectional reset pin; supports μC reset pin sharing with other peripherals | Required for microcontrollers with bidirectional reset I/O (e.g., some STM32 variants) | Select only if target MCU uses bidirectional reset - MAX6315US29D3+T is incompatible due to unidirectional open-drain output |
| TPS3808G33DBVR | Fixed 3.3V threshold; 200ms min timeout; 2.5μA ICC; SOT23-5 package | Larger footprint (5-pin); lacks MR input - requires external switch or GPIO for manual reset | Choose when 3.3V threshold suffices and board space allows 5-pin SOT23; not drop-in due to pin count and missing MR function |
Compared with MAX6314US29D3+T and TPS3808G33DBVR, the MAX6315US29D3+T offers optimal trade-off for cost-sensitive, space-constrained designs needing manual reset, precise 2.93V detection, and minimal external components - all in a 4-pin SOT23 with guaranteed 125°C operation.
Availability
MAX6315US29D3+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered wireless sensors, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6315US29D3+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.
The MAX6315 belongs to Analog Devices' precision supervisory IC product line, engineered for deterministic power-on reset, brownout protection, and manual reset integration in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6315US29D3+T?
The MAX6315US29D3+T has a factory-trimmed nominal reset threshold of 2.93V, with tolerance of ±3.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during manufacturing and specified in the Electrical Characteristics table under "Reset Threshold (VTH)" - it ensures accurate undervoltage detection for 3.0V nominal rails without external calibration.
Does the MAX6315US29D3+T require an external pullup resistor on the RESET pin?
Yes, the MAX6315US29D3+T features an open-drain RESET output and requires an external pullup resistor. A 10kΩ resistor to a logic supply (e.g., +3.3V or +5.0V) is recommended per the datasheet. This resistor enables proper logic-high assertion when RESET is inactive and ensures sufficient sink current (≤0.4V at 3.2mA) when asserted - critical for reliable microprocessor reset signaling.
Can the MAX6315US29D3+T monitor a supply voltage lower than its own VCC pin voltage?
No - the MAX6315US29D3+T monitors only the voltage applied to its VCC pin. Its internal voltage-divider network samples VCC directly; it cannot supervise a separate rail. To monitor a different supply, that rail must be connected to the VCC pin. The open-drain RESET output *can* interface with higher-voltage logic domains, but sensing is strictly limited to the VCC node.
What is the minimum reset timeout period for the MAX6315US29D3+T?
The MAX6315US29D3+T provides a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full temperature range (-40°C to +125°C), with typical values ranging from 140ms to 280ms depending on temperature and process variation - sufficient to meet boot-time requirements of most ARM Cortex-M and PIC microcontrollers.
Is the MR (manual reset) input of the MAX6315US29D3+T internally pulled up?
Yes, the MR input of the MAX6315US29D3+T includes an internal 63kΩ pullup resistor to VCC, allowing it to be left floating if unused. When active, a logic-low pulse ≥1μs on MR forces RESET assertion for the full 140ms timeout period after MR returns high. This eliminates need for external pullup components and simplifies pushbutton reset implementation.
MAX6315US29D3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6315US29D3+T FAQ
1.How can I place an order for MAX6315US29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6315US29D3+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 MAX6315US29D3+T reliable?
The price and inventory of MAX6315US29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6315US29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6315US29D3+T?
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MAX6315US29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6315US29D3+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 MAX6315US29D3+T?
For technical support, including MAX6315US29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6315US29D3+T requirements.
6.How does Aetrix verify that MAX6315US29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6315US29D3+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 MAX6315US29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6315US29D3+T?
All MAX6315US29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6315US29D3+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 MAX6315US29D3+T part is unused and in its original packaging.
Return procedure for MAX6315US29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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