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Analog Devices Inc./Maxim Integrated MAX6314US44D3+T
- Part No.:
- MAX6314US44D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6314US44D3+T.pdf
- Description:
- IC RESET CIRCUIT 4.39V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6314US44D3+T from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit designed to monitor VCC supply voltage and assert a bidirectional reset signal for µPs with bidirectional reset I/Os (e.g., 68HC11). It features a factory-trimmed 4.39V reset threshold, 140ms minimum reset timeout period, ±1.8% threshold accuracy at +25°C, 5µA supply current, and SOT143 package. It is used in portable/battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6314US44D3+T datasheet, MAX6314US44D3+T pinout, MAX6314US44D3+T application, or MAX6314US44D3+T equivalent, key selection criteria include bidirectional RESET compatibility, precise 4.39V threshold tolerance, 140ms timeout timing, immunity to short VCC transients, and absence of external pull-up components.
Technical Context
The MAX6314US44D3+T integrates a precision voltage comparator with laser-trimmed resistors to monitor VCC against a fixed 4.39V threshold and trigger a reset when voltage falls below that level. Its internal timer guarantees RESET remains asserted for ≥140ms after VCC recovers above threshold or manual reset deassertion.
The RESET output combines a 4.7kΩ passive pull-up resistor with a P-channel active pull-up transistor enabled for 2µs upon rising edge detection - enabling fast rise time (<350ns typical) even under high capacitive load conditions common in multi-device reset buses. MR input includes a 63kΩ internal pull-up and supports debounced manual reset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH Nominal | 4.39V - Factory-trimmed threshold ensures accurate power-fail detection for 4.5V–5V systems. |
| tRP Min | 140ms - Guarantees sufficient reset hold time for full µP initialization during power-up or brownout recovery. |
| Reset Threshold Accuracy | ±1.8% at +25°C - Enables stable reset assertion without calibration or trimming in production environments. |
| ICC | 5µA - Ultra-low quiescent current extends battery life in portable applications. |
| RESET Output Type | Bidirectional with integrated 4.7kΩ pull-up + P-channel active pull-up - Directly interfaces 68HC11-style µPs without external components. |
| MR Input Threshold | 0.3×VCC (low), 0.7×VCC (high) - Ensures noise-immune manual reset activation across operating voltage range. |
| Operating Temp Range | −40°C to +85°C - Qualified for industrial and automotive-adjacent embedded applications. |
Pinout & Package
SOT143 package: 4-pin, surface-mount, lead-free compatible (indicated by "+T" suffix), footprint matches JEDEC TO-236AB standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input and reset threshold monitor node | Monitored directly by internal voltage divider; must be decoupled with 0.1µF capacitor near pin for transient immunity. |
| MR | Manual reset input | Active-low; internally pulled up to VCC via 63kΩ resistor; logic low asserts reset and holds it for full 140ms timeout. |
| RESET | Bidirectional reset output | Combines N-channel pulldown + parallel 4.7kΩ pull-up + P-channel active pull-up; sinks current when low, drives high actively for fast rise time. |
| GND | Ground reference | Return path for all internal circuitry; must be connected to system ground plane with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.39V reset threshold | Eliminates need for external resistor dividers or calibration, reducing BOM count and assembly cost. |
| 140ms minimum reset timeout | Ensures µP completes full boot sequence before release, preventing race conditions in firmware startup. |
| Bidirectional RESET interface | Enables µP self-diagnostics (e.g., 68HC11 reset source identification) without external logic or bus arbitration. |
| 5µA supply current | Supports >10-year battery operation in always-on monitoring applications such as smart sensors or IoT endpoints. |
| Immunity to VCC transients ≤100µs | Prevents false resets during switching noise or ESD events, improving system robustness in electrically noisy environments. |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools require guaranteed reset during cold-start and brownout. IC Role / Device Role / Timing Role: MAX6314US44D3+T monitors 4.2V Li-ion supply and asserts reset until voltage stabilizes above 4.39V for ≥140ms. Use Value: Prevents corrupted EEPROM writes or sensor initialization errors during marginal power conditions. |
Use Scenario: Programmable logic controllers operate in harsh factory environments with fluctuating 5V rails and EMI. IC Role / Device Role / Timing Role: MAX6314US44D3+T provides deterministic reset timing and rejects sub-100µs supply glitches on VCC. Use Value: Avoids unintended controller reboot during motor switching transients, ensuring process continuity. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Meters with backup supercapacitors must restart cleanly after AC mains interruption. IC Role / Device Role / Timing Role: MAX6314US44D3+T detects VCC drop below 4.39V and holds reset for 140ms while capacitor discharges. Use Value: Guarantees secure firmware state restoration and prevents meter data loss during brief outages. |
Use Scenario: BCMs powered from vehicle battery experience load-dump and cranking voltage dips. IC Role / Device Role / Timing Role: MAX6314US44D3+T asserts reset during cranking (VCC < 4.39V) and maintains it for 140ms post-recovery. Use Value: Ensures MCU reinitializes peripherals correctly after engine start, avoiding CAN bus faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US44D3+T | Open-drain RESET output (no internal pull-up); requires external 4.7kΩ pull-up resistor. | Lacks bidirectional reset capability; incompatible with 68HC11-style µPs needing active pull-up. | Select only if system uses open-drain reset architecture and external pull-up is acceptable. |
| TPS3808G33DBVR | Fixed 3.3V threshold; 200ms timeout; push-pull RESET; no MR input; ±2% accuracy over temperature. | Not suitable for 4.39V monitoring or manual reset integration; requires different PCB layout and firmware handling. | Choose only for 3.3V systems where bidirectional reset is unnecessary and higher tempco is acceptable. |
Compared with MAX6314US44D3+T, MAX6315US44D3+T lacks integrated pull-up and cannot support bidirectional reset protocols, while TPS3808G33DBVR offers tighter tempco but fails to match the 4.39V threshold or MR functionality required in legacy µP designs.
Availability
MAX6314US44D3+T 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 across extended temperature ranges and long product lifecycles.
Supply support for MAX6314US44D3+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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6314 family was designed specifically for reliable, low-cost µP supervision in systems with bidirectional reset I/Os - targeting legacy and new designs requiring precise voltage monitoring without external components.
FAQ
What is the exact reset threshold voltage of the MAX6314US44D3+T?
The MAX6314US44D3+T has a factory-trimmed nominal reset threshold voltage of 4.39V, with ±1.8% accuracy at +25°C and ±2.5% over the full −40°C to +85°C temperature range. This value is laser-trimmed during manufacturing and does not require external adjustment. The MAX6314US44D3+T is specified to assert RESET when VCC falls below this threshold and hold it until VCC rises above 4.39V and the 140ms timeout expires.
Does the MAX6314US44D3+T support bidirectional reset communication with the 68HC11 microcontroller?
Yes, the MAX6314US44D3+T is explicitly designed for bidirectional reset compatibility with the Motorola 68HC11 and other µPs featuring bidirectional reset I/O pins. Its RESET output includes both an N-channel pulldown and a parallel 4.7kΩ pull-up with P-channel active pull-up, enabling the µP to drive RESET low and detect external assertion - a requirement for 68HC11 reset-source discrimination. This functionality is integral to the MAX6314US44D3+T's architecture and verified in its functional diagram and timing specifications.
What is the minimum reset timeout period for the MAX6314US44D3+T?
The MAX6314US44D3+T has a minimum reset timeout period (tRP) of 140ms. This is the guaranteed duration RESET remains asserted after VCC rises above the 4.39V threshold or after the MR input is deasserted. The actual timeout may vary slightly due to temperature and process variation but will never fall below 140ms. This value is fixed per device variant and confirmed in the Ordering Information table and Electrical Characteristics section of the MAX6314US44D3+T datasheet.
Can the MAX6314US44D3+T operate from a 3.3V supply?
No, the MAX6314US44D3+T is not rated for reliable operation at 3.3V. Its specified operating voltage range is 2.5V to 5.5V, but its 4.39V reset threshold means it will continuously assert RESET when VCC is below that level - including at 3.3V. For 3.3V systems, a different variant such as MAX6314US33D3+T (3.30V threshold) or alternative supervisor like TPS3808G33 should be selected. The MAX6314US44D3+T is intended for 4.5V–5V supply rails where 4.39V monitoring is required.
Is an external pull-up resistor required for the RESET pin of the MAX6314US44D3+T?
No external pull-up resistor is required for the RESET pin of the MAX6314US44D3+T. It integrates a 4.7kΩ pull-up resistor and a P-channel active pull-up transistor that engages for 2µs during rising-edge transitions. This dual-stage pull-up ensures fast rise time (<350ns typical into 100pF) and eliminates the need for external components - a key design feature confirmed in the Typical Operating Circuit, Pin Description, and Detailed Description sections of the MAX6314US44D3+T datasheet.
MAX6314US44D3+T 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:
- 4.39V
- Output:
- Bidirectional
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6314US44D3+T FAQ
1.How can I place an order for MAX6314US44D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6314US44D3+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 MAX6314US44D3+T reliable?
The price and inventory of MAX6314US44D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6314US44D3+T is usually 5 days.
3.What payment methods are accepted for MAX6314US44D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6314US44D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6314US44D3+T?
MAX6314US44D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6314US44D3+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 MAX6314US44D3+T?
For technical support, including MAX6314US44D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6314US44D3+T requirements.
6.How does Aetrix verify that MAX6314US44D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6314US44D3+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 MAX6314US44D3+T meets industry standards.
7.What is the process for return or replacement of MAX6314US44D3+T?
All MAX6314US44D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6314US44D3+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 MAX6314US44D3+T part is unused and in its original packaging.
Return procedure for MAX6314US44D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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