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Analog Devices Inc./Maxim Integrated MAX6315US25D1
- Part No.:
- MAX6315US25D1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6315US25D1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:162
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Product details
Overview
MAX6315US25D1 from Maxim Integrated is a low-power, open-drain microprocessor reset supervisor IC that monitors VCC supply voltage and asserts an active-low RESET signal when VCC falls below 2.50V (±3.5% over temperature), with a guaranteed minimum reset timeout period of 1ms. It features a 4-pin SOT143 package, 5µA typical supply current at +25°C, internal MR pullup resistor (~63kΩ), and operates across –40°C to +125°C. It is used in portable battery-powered equipment for reliable power-on reset and brownout detection.
For engineers reviewing the MAX6315US25D1 datasheet, MAX6315US25D1 pinout, MAX6315US25D1 application, or MAX6315US25D1 equivalent, key selection considerations include its factory-trimmed 2.50V reset threshold, 1ms minimum timeout, open-drain output capable of level-shifting above VCC, immunity to short VCC transients, and compatibility with µP systems requiring manual reset input and guaranteed operation over extended temperature range.
Technical Context
The MAX6315US25D1 implements a precision voltage-monitoring comparator with laser-trimmed resistive divider to detect VCC falling below 2.50V, triggering an internally timed reset pulse. Its open-drain RESET output uses an n-channel MOSFET switch, enabling pullup to voltages up to +6.0V - independent of VCC - supporting level-shifted reset signaling across multiple supply domains.
It integrates a debounced manual reset input (MR) with internal 63kΩ pullup, allowing direct connection of a momentary switch to GND without external components. The device's reset timeout timer restarts on every VCC dip below threshold and remains asserted for ≥1ms after VCC recovers, ensuring robust immunity to sub-millisecond transients per the Maximum Transient Duration vs. Comparator Overdrive curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH Nominal | 2.50V - Factory-trimmed reset threshold with ±3.5% tolerance over –40°C to +125°C ensures accurate brownout detection for 2.5V logic systems. |
| tRP Min | 1ms - Minimum guaranteed reset timeout period prevents premature release of µP reset during slow-rising VCC or marginal power recovery. |
| ICC | 5µA typical at +25°C - Ultra-low quiescent current extends battery life in portable and always-on monitoring applications. |
| RESET Output | Open-drain n-MOS - Enables pullup to any voltage ≤+6.0V, allowing reset assertion across different supply domains (e.g., 3.3V µP reset by 2.5V-supervised IC). |
| MR Input | Internal 63kΩ pullup - Eliminates need for external pullup; supports direct switch-to-GND manual reset with no debounce circuitry required. |
| Operating Temp | –40°C to +125°C - Qualified for automotive under-hood, industrial control, and high-reliability embedded environments. |
| VCC Range | 1.0V to 5.5V - Ensures valid reset assertion down to 1.0V VCC, guaranteeing fail-safe behavior even during deep brownout or power collapse. |
Pinout & Package
MAX6315US25D1 is housed in a 4-pin SOT143 (also referenced as U4+1 / SOT-143B) surface-mount package with 1.3mm pitch, JEDEC MO-178 compliant footprint, and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | System ground return path for internal comparator and reset timer; must be low-impedance to ensure accurate threshold sensing. |
| 2 (RESET) | Active-low open-drain output | Sinks current when asserted; requires external pullup resistor (e.g., 10kΩ) to target reset rail (≤+6.0V); floats high when deasserted. |
| 3 (MR) | Manual reset input | Logic-low active input; internally pulled up to VCC (~63kΩ); asserts reset immediately and holds it for full tRP after release. |
| 4 (VCC) | Supply and monitor input | Power source and monitored voltage node; internal laser-trimmed divider derives 2.50V threshold reference from this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-set VTH | 2.50V ±3.5% over full temperature range eliminates calibration and reduces BOM count versus adjustable reset ICs. |
| Guaranteed 1ms reset timeout | Ensures µP reset remains asserted long enough for stable clock and supply establishment, even under worst-case VCC ramp conditions. |
| Open-drain RESET with >VCC capability | Enables single reset supervisor to drive reset lines of multiple ICs powered from different rails (e.g., 2.5V supervisor driving 3.3V µP). |
| Immunity to short VCC transients | Rejects glitches ≤1µs wide (at 100mV overdrive), preventing spurious resets in noisy or switching-power-supply environments. |
| Integrated MR pullup | Removes need for external pullup resistor, saving PCB area and reducing component count in space-constrained portable designs. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered wearable ECG sensor operating from a 2.5V LDO with intermittent RF transmission. IC Role / Device Role / Timing Role: Monitors 2.5V rail and asserts RESET during battery sag or cold-start; guarantees µC enters known state before firmware initialization. Use Value: Prevents corrupted memory writes or erratic analog front-end behavior during brownout, directly enabled by 2.50V threshold and 1ms timeout. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V-to-2.5V DC/DC powering core logic. IC Role / Device Role / Timing Role: Supervises 2.5V digital supply and provides manual reset via front-panel pushbutton for field firmware recovery. Use Value: Ensures deterministic boot after power interruption or watchdog timeout, leveraging MR debouncing and –40°C to +125°C qualification. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: Under-hood BCM using 2.5V microcontroller supplied from vehicle battery via multi-stage regulation. IC Role / Device Role / Timing Role: Detects undervoltage events during cranking (battery dip to ~6–9V) that propagate through regulators to 2.5V domain. Use Value: Maintains system integrity during engine start by asserting reset before µC executes invalid instructions, supported by guaranteed operation to +125°C. |
Use Scenario: Revenue-grade electricity meter with tamper-detection circuitry and real-time clock backed by supercapacitor. IC Role / Device Role / Timing Role: Monitors 2.5V RTC and metrology ASIC supply; triggers controlled shutdown and nonvolatile state save upon detected brownout. Use Value: Preserves billing accuracy and timekeeping continuity using open-drain RESET to coordinate reset across multiple voltage domains (e.g., 3.3V comms + 2.5V metrology). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US25D1-T | Push-pull (active-high) RESET output; same 2.50V threshold, 1ms timeout, and SOT143 package. | Requires direct connection to µP reset pin expecting active-high signal; incompatible with open-drain bus architectures or level-shifting needs. | Select only if target µP has dedicated active-high reset input and no shared reset bus. |
| TPS3808G12DBVR | Adjustable threshold (via external resistor divider); 1.2V to 5.5V range; 20ms default timeout; SOT-23-5 package. | Lacks factory-trimmed precision and fixed 2.50V point; requires two external resistors; higher quiescent current (12µA typical). | Choose when design requires flexible threshold tuning or board space permits SOT-23-5; not drop-in for MAX6315US25D1 due to pin count and topology mismatch. |
Compared with MAX6315US25D1, MAX6314US25D1 offers identical supervision specs but lacks level-shifting capability, while TPS3808G12DBVR trades precision and simplicity for configurability and higher power - making MAX6315US25D1 optimal for cost-sensitive, space-constrained 2.5V systems demanding guaranteed timing and open-drain interoperability.
Availability
MAX6315US25D1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply, extended temperature support, and long-term lifecycle assurance.
Supply support for MAX6315US25D1 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6315 product line delivers precision, low-power, single-function reset supervisors optimized for reliability-critical µP-based systems where minimal external components, guaranteed timing, and extended temperature operation are mandatory.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6315US25D1?
The MAX6315US25D1 has a nominal reset threshold voltage of 2.50V, with a guaranteed tolerance of ±3.5% over the full operating temperature range of –40°C to +125°C. This specification is factory-laser-trimmed and confirmed in the Electrical Characteristics table under "Reset Threshold (Note 1)" for the D1 temperature grade. The MAX6315US25D1 does not use adjustable resistors - its threshold is fixed and unchangeable.
Does MAX6315US25D1 support manual reset, and how is it implemented?
Yes, MAX6315US25D1 includes a dedicated Manual Reset (MR) input on Pin 3. It is logic-low active and features an internal 63kΩ pullup resistor to VCC, allowing direct connection of a momentary switch to GND without external components. When MR is pulled low, MAX6315US25D1 asserts RESET immediately and holds it for the full 1ms timeout period after MR returns high - providing fully debounced manual reset functionality.
Can the RESET output of MAX6315US25D1 be pulled up to a voltage higher than its VCC supply?
Yes, the RESET output of MAX6315US25D1 is an open-drain n-channel MOSFET capable of being pulled up to any voltage between 0V and +6.0V - including voltages higher than the IC's own VCC. This enables level-shifting applications, such as using a 2.5V-supervised MAX6315US25D1 to assert reset on a 3.3V or 5V microprocessor. The absolute maximum rating for RESET is +6.0V, and sink current is specified up to 20mA.
What is the supply current consumption of MAX6315US25D1 across temperature and voltage?
The MAX6315US25D1 draws 5µA typical supply current at +25°C and VCC = 3.6V, with a maximum of 12µA over –40°C to +85°C and 15µA over –40°C to +125°C. Current remains stable across VCC from 1.0V to 5.5V, as verified in the "Supply Current vs. Supply Voltage" and "Supply Current vs. Temperature" graphs (Figures MAX6315-01 and MAX6315-02). This ultra-low ICC makes MAX6315US25D1 ideal for battery-backed and energy-harvesting systems.
Is MAX6315US25D1 pin-compatible with other members of the MAX6315 family or legacy parts?
Yes, all MAX6315 variants - including MAX6315US25D1 - share identical 4-pin SOT143 pinout (VCC, MR, RESET, GND) and are pin-compatible with the industry-standard MAX811 series. This allows direct substitution in existing layouts when upgrading to tighter thresholds, longer timeouts, or extended temperature grades - provided the reset logic polarity (open-drain active-low) and electrical interface remain compatible with the host system.
MAX6315US25D1 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:
- 2.5V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6315US25D1 FAQ
1.How can I place an order for MAX6315US25D1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6315US25D1 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 MAX6315US25D1 reliable?
The price and inventory of MAX6315US25D1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6315US25D1 is usually 5 days.
3.What payment methods are accepted for MAX6315US25D1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6315US25D1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6315US25D1?
MAX6315US25D1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6315US25D1 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 MAX6315US25D1?
For technical support, including MAX6315US25D1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6315US25D1 requirements.
6.How does Aetrix verify that MAX6315US25D1 is sourced from the original manufacturer or authorized distributors?
All MAX6315US25D1 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 MAX6315US25D1 meets industry standards.
7.What is the process for return or replacement of MAX6315US25D1?
All MAX6315US25D1 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6315US25D1, 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 MAX6315US25D1 part is unused and in its original packaging.
Return procedure for MAX6315US25D1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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