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Analog Devices Inc./Maxim Integrated MAX6315US28D3+T
- Part No.:
- MAX6315US28D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6315US28D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,712
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Product details
Overview
MAX6315US28D3+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 2.83V or upon manual reset assertion. It provides a factory-trimmed 140ms (min) reset timeout period, operates from -40°C to +125°C, draws only 5μA typical supply current, and uses a 4-pin SOT23 package for space-constrained embedded power monitoring.
For engineers reviewing the MAX6315US28D3+T datasheet, MAX6315US28D3+T pinout, MAX6315US28D3+T application, or MAX6315US28D3+T equivalent, key selection criteria include its precise 2.83V reset threshold, guaranteed 140ms minimum timeout at extended temperature, open-drain RESET output compatible with supplies up to 6V, and immunity to sub-100ns MR glitches - all critical for reliable brownout recovery in battery-powered controllers.
Technical Context
The MAX6315US28D3+T implements a precision voltage-monitoring comparator with factory-laser-trimmed resistive divider setting the 2.83V nominal reset threshold, ±3.5% over -40°C to +125°C. Its internal timer generates a fixed 140ms (min) reset pulse after VCC recovery or MR release, independent of external components.
Its open-drain RESET output uses an n-channel MOSFET capable of sinking ≥1.2mA at VCC > 2.5V while allowing pullup to voltages up to 6V - enabling level-shifting across supply domains. The MR input includes a 63kΩ internal pullup and rejects transients <100ns, eliminating need for external debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.83V nominal, ±3.5% over full temperature range - ensures deterministic brownout detection at defined supply rail margin |
| Reset Timeout Period | 140ms minimum at -40°C to +125°C - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 5μA typical at VCC = 5.5V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage Range | 1.0V to 5.5V - supports supervision of low-voltage microcontrollers and legacy 5V systems |
| MR Glitch Rejection | 100ns - prevents false resets from EMI or PCB trace coupling on manual reset line |
| RESET Output Drive | Sinks ≥1.2mA at VCC > 2.5V with VOL ≤ 0.3V - ensures clean logic-low under load without external driver |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
MAX6315US28D3+T is housed in a RoHS-compliant 4-pin SOT23 package (package code U4+1), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for high-density PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal circuitry and RESET sink current; must be connected to system ground plane |
| RESET (Pin 2) | Active-low open-drain output | Asserts logic-low during reset; requires external pullup (e.g., 10kΩ) to any supply ≤6V for level-shifting capability |
| MR (Pin 3) | Manual reset input | Logic-low assertion triggers reset; internally pulled up to VCC via 63kΩ resistor - allows direct switch-to-ground connection |
| VCC (Pin 4) | Supply and monitor input | Power source and monitored voltage rail; internal divider compares this node to 2.83V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed reset threshold | 2.83V set at wafer level with ±3.5% tolerance over -40°C to +125°C - eliminates calibration labor and external resistor networks |
| Fixed 140ms minimum reset timeout | Internally generated timing ensures consistent μP initialization window regardless of external capacitor drift or temperature |
| Open-drain RESET with 6V tolerance | Enables reset signaling across isolated power domains (e.g., 3.3V supervisor driving 5V μP reset line) without level translators |
| Integrated MR pullup resistor | 63kΩ internal pullup allows single-pole switch interface - reduces BOM count and PCB area vs. discrete pullup solutions |
| Ultra-low 5μA supply current | Minimizes quiescent drain in always-on battery backup paths - extends shelf life of portable medical and sensor devices |
Applications
| Battery-Powered Data Loggers | Automotive Body Control Modules |
|---|---|
Use Scenario: Long-term environmental monitoring using coin-cell power with infrequent wake-up cycles. IC Role / Device Role / Timing Role: Supervises 3.3V supply rail and asserts reset if voltage sags below 2.83V during cold-start or battery aging. Use Value: 5μA quiescent current preserves battery life; 140ms timeout ensures reliable firmware boot before sensor sampling begins. | Use Scenario: Power management in door module ECUs exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Monitors 5V system rail and initiates controlled reset during load-dump transients or alternator ripple events. Use Value: -40°C to +125°C rating and ±3.5% threshold stability maintain reset accuracy across extreme ambient conditions. |
| Industrial PLC I/O Subsystems | Portable Medical Diagnostic Devices |
Use Scenario: Distributed I/O nodes powered from 24V DC-DC converters with local 3.3V regulation. IC Role / Device Role / Timing Role: Detects undervoltage on local 3.3V rail and holds microcontroller in reset until stable, preventing corrupted register writes. Use Value: Open-drain RESET pulled to 5V logic domain ensures compatibility with legacy backplane signaling standards. | Use Scenario: Handheld ultrasound probe with lithium-polymer battery and real-time DSP processing. IC Role / Device Role / Timing Role: Provides glitch-immune reset initiation during hot-swap battery replacement or ESD events on USB interface. Use Value: 100ns MR glitch rejection prevents spurious resets during cable insertion; SOT23 footprint saves critical board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US28D3+T | Bidirectional reset pin supporting μC reset pin sharing; otherwise identical threshold and timeout | Required where microcontroller uses same pin for reset input and status output | Select MAX6314US28D3+T only if bidirectional reset functionality is explicitly needed; MAX6315US28D3+T is simpler and lower cost for standard unidirectional use |
| TPS3808G33DBVR | 3.3V fixed threshold; 200ms min timeout; 1.4μA supply current; SOT23-6 package | Lacks manual reset input; higher integration density but no MR capability | Choose TPS3808G33DBVR when manual reset is unnecessary and ultra-low current (<2μA) is prioritized over MR flexibility |
Compared with MAX6314US28D3+T, MAX6315US28D3+T offers lower system cost and reduced complexity for unidirectional reset applications; versus TPS3808G33DBVR, it trades 1.4μA current for essential MR functionality and wider VCC operating range (1.0–5.5V vs. 2.0–6.0V), making it suitable for brownout-prone battery systems.
Availability
MAX6315US28D3+T is available at Aetrix Electronics and suitable for battery-powered data loggers, automotive body control modules, and industrial PLC I/O subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6315US28D3+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 family delivers precision, low-power voltage supervision for microprocessor-based systems - designed specifically for reliable power-up, brownout, and manual reset control in space- and energy-constrained applications.
FAQ
What is the exact reset threshold voltage of the MAX6315US28D3+T?
The MAX6315US28D3+T has a factory-trimmed nominal reset threshold of 2.83V, 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 does not require external calibration. The MAX6315US28D3+T datasheet specifies this threshold in the Electrical Characteristics table under "Reset Threshold (VTH)" with test conditions confirming its stability across voltage and temperature.
Does the MAX6315US28D3+T require an external pullup resistor on the RESET pin?
Yes, the MAX6315US28D3+T features an open-drain RESET output and requires an external pullup resistor to establish a valid logic-high state when deasserted. A 10kΩ resistor pulled to any supply between 0V and 6V is recommended per the MAX6315US28D3+T datasheet. This configuration enables level-shifting - for example, using a 5V pullup while monitoring a 3.3V VCC rail - a key design advantage of the MAX6315US28D3+T.
What is the minimum reset timeout period for the MAX6315US28D3+T across temperature?
The MAX6315US28D3+T guarantees a minimum reset timeout period of 140ms over its full operating temperature range of -40°C to +125°C. This value is specified in the Electrical Characteristics table under "Reset Timeout Period (tRP)" for part suffix D3-T. The actual timeout may extend up to 280ms at +25°C, but the 140ms minimum ensures reliable microprocessor initialization even under worst-case thermal and process conditions.
Can the MAX6315US28D3+T monitor supply voltages below 2.83V?
No - the MAX6315US28D3+T is factory-configured exclusively for a 2.83V reset threshold and cannot be adjusted. Its internal voltage-divider network is laser-trimmed during production and fixed for this specific threshold. To supervise lower rails (e.g., 1.8V or 2.5V), a different variant such as MAX6315US26D3+T (2.63V) or MAX6315US25D3+T would be required. The MAX6315US28D3+T's design purpose is precise, single-threshold supervision at 2.83V.
Is the MR pin of the MAX6315US28D3+T compatible with direct switch-to-ground connection?
Yes, the MR pin of the MAX6315US28D3+T includes an internal 63kΩ pullup resistor to VCC, allowing direct connection of a normally-open momentary switch between MR and GND. No external components are needed for basic manual reset functionality. The MAX6315US28D3+T datasheet confirms this in the Pin Description section and Applications Information, noting that the 100ns glitch rejection further enhances noise immunity in such configurations.
MAX6315US28D3+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:
- 2.8V
- 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
MAX6315US28D3+T FAQ
1.How can I place an order for MAX6315US28D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6315US28D3+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 MAX6315US28D3+T reliable?
The price and inventory of MAX6315US28D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6315US28D3+T is usually 5 days.
3.What payment methods are accepted for MAX6315US28D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6315US28D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6315US28D3+T?
MAX6315US28D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6315US28D3+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 MAX6315US28D3+T?
For technical support, including MAX6315US28D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6315US28D3+T requirements.
6.How does Aetrix verify that MAX6315US28D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6315US28D3+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 MAX6315US28D3+T meets industry standards.
7.What is the process for return or replacement of MAX6315US28D3+T?
All MAX6315US28D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6315US28D3+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 MAX6315US28D3+T part is unused and in its original packaging.
Return procedure for MAX6315US28D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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