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Analog Devices Inc./Maxim Integrated MAX6314US44D2
- Part No.:
- MAX6314US44D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6314US44D2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:9,785
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Product details
Overview
MAX6314US44D2 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., Motorola 68HC11). It features a factory-trimmed 4.39V reset threshold, 20ms minimum reset timeout period, ±1.8% threshold accuracy at +25°C, 5µA supply current, and SOT143 package. Used in portable/battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6314US44D2 datasheet, MAX6314US44D2 pinout, MAX6314US44D2 application, or MAX6314US44D2 equivalent, key selection criteria include bidirectional reset compatibility, precise 4.39V threshold tolerance, 20ms timeout timing, immunity to short VCC transients, and absence of external pull-up requirements due to integrated 4.7kΩ resistor + active p-channel pullup.
Technical Context
The MAX6314US44D2 implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 4.39V nominal reset threshold, maintaining ±2.5% accuracy over –40°C to +85°C. Its reset generator uses an internally programmed monostable timer to guarantee ≥20ms RESET assertion after VCC recovery or MR deassertion.
The RESET output combines an n-channel pulldown, a 4.7kΩ passive pullup, and a p-channel active pullup enabled for 2µs upon rising-edge detection below 0.5V - enabling fast rise time (<350ns typical) on capacitive reset buses with multiple devices, critical for correct 68HC11-style reset source discrimination.
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 without external adjustment. |
| tRP Min | 20ms - guaranteed minimum reset pulse width prevents premature µP release during slow-rising VCC. |
| ICC | 5µA - ultra-low quiescent current extends battery life in portable applications. |
| VTH Accuracy | ±1.8% at +25°C - tight initial tolerance reduces system-level calibration burden. |
| Reset Output Type | Bidirectional with integrated 4.7kΩ pullup + p-channel active pullup - eliminates external components and enables 68HC11-compatible reset arbitration. |
| VCC Range | 1.0V to 5.5V - supports operation down to brownout levels while maintaining RESET sink capability. |
| MR Input Threshold | VIL = 0.8V - compatible with standard CMOS logic low levels; internal 63kΩ pullup allows direct switch-to-GND connection. |
Pinout & Package
SOT143 (4-pin, surface-mount) package with 1.3mm × 2.9mm footprint, -40°C to +85°C operating temperature range, and lead-free option available (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage and reset threshold monitor input | Primary power rail input; internally divided to compare against reference for reset assertion. |
| MR | Manual reset input | Active-low input with internal 63kΩ pullup; asserts RESET when pulled low; debounced via internal timing. |
| RESET | Bidirectional reset output | Open-drain-like output with integrated 4.7kΩ pullup + p-channel active pullup; sinks current when low, drives high via dual-path pullup for fast rise time. |
| GND | Ground reference | Return path for VCC, MR, and RESET circuits; must be low-impedance for accurate threshold sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional RESET interface | Enables direct connection to µPs like 68HC11 that distinguish internal vs. external reset sources via timing-based bus arbitration. |
| Factory-trimmed 4.39V threshold | Eliminates need for external resistor dividers or trimming; supports 4.5V nominal supply systems with margin for droop. |
| Integrated 4.7kΩ + active p-channel pullup | Reduces board space and BOM count; ensures <500ns RESET rise time even with 390pF bus capacitance. |
| 20ms minimum reset timeout | Guarantees sufficient hold time for µP initialization across voltage ramp rates up to 100V/µs. |
| 5µA supply current | Minimizes standby power draw in battery-critical applications such as handheld test instruments and remote sensors. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters require reliable power-on reset and brownout recovery without external components. IC Role / Device Role / Timing Role: MAX6314US44D2 monitors 4.2V Li-ion supply and asserts RESET until VCC stabilizes above 4.39V, then holds for ≥20ms. Use Value: 5µA quiescent current extends single-charge battery life; integrated pullup avoids PCB real estate loss in compact enclosures. |
Use Scenario: Modular PLC backplanes host multiple µP-based I/O cards sharing a common reset bus subject to noise and capacitance. IC Role / Device Role / Timing Role: MAX6314US44D2 provides synchronized, glitch-immune reset assertion across all cards using bidirectional RESET arbitration. Use Value: Active p-channel pullup ensures RESET rises within two E-clock cycles (<500ns @ 4MHz), enabling correct source identification by 68HC11-class controllers. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: BCMs powered from vehicle battery (9–16V) with LDO-regulated 5V rails experience load-dump transients and cold-crank undervoltage. IC Role / Device Role / Timing Role: MAX6314US44D2 detects VCC dip below 4.39V during cranking and holds RESET for ≥20ms post-recovery to prevent firmware corruption. Use Value: Immunity to ≤100µs VCC transients (per Typical Operating Characteristics) avoids spurious resets during engine start. |
Use Scenario: Revenue-grade meters operate from AC/DC converters with ripple-sensitive µPs requiring deterministic reset behavior during line sags. IC Role / Device Role / Timing Role: MAX6314US44D2 monitors regulated 4.5V rail and asserts RESET on sag below 4.39V, with 20ms timeout ensuring stable clock domain initialization. Use Value: ±2.5% VTH accuracy over temperature guarantees consistent trip point across –25°C to +70°C meter operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US44D2-T | Open-drain RESET output (no internal pullup); identical 4.39V threshold and 20ms timeout. | Requires external 4.7kΩ pullup resistor; unsuitable for bidirectional reset arbitration but lower cost where µP has dedicated reset driver. | Select MAX6315US44D2-T only if the target µP does not require bidirectional reset source detection and external component addition is acceptable. |
| TPS3808G33DBVR | Fixed 3.3V threshold; push-pull RESET; 20ms timeout; 1.5µA ICC; SOT-23-5 package. | Not pin-compatible; requires different PCB layout; lacks bidirectional capability and manual reset input. | Choose TPS3808G33DBVR only for 3.3V systems where ultra-low current (1.5µA) outweighs loss of MR and bidirectional functionality. |
Compared with MAX6315US44D2-T and TPS3808G33DBVR, the MAX6314US44D2 uniquely delivers factory-trimmed 4.39V monitoring, bidirectional RESET arbitration support, integrated pullup, and manual reset in a 4-pin SOT143 - making it irreplaceable for 4.5V-system 68HC11-based designs requiring zero external components and deterministic reset source identification.
Availability
MAX6314US44D2 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, long-term lifecycle support, and traceable sourcing.
Supply support for MAX6314US44D2 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.
The MAX6314 family delivers low-power, factory-trimmed µP supervisory circuits optimized for systems requiring bidirectional reset compatibility, minimal external components, and robust transient immunity - especially in battery-powered and noise-prone environments.
FAQ
What is the exact reset threshold voltage of the MAX6314US44D2?
The MAX6314US44D2 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 operating temperature range. This value is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet, and applies specifically to the "US44" variant with "D2" timeout suffix.
Does the MAX6314US44D2 require an external pull-up resistor on the RESET pin?
No, the MAX6314US44D2 does not require an external pull-up resistor. It integrates a 4.7kΩ passive pull-up resistor in parallel with an active p-channel transistor, enabling fast RESET rise time and eliminating external components - a key design feature explicitly stated in the General Description and Pin Description sections.
What is the minimum reset timeout period for the MAX6314US44D2?
The MAX6314US44D2 has a minimum reset timeout period (tRP) of 20ms, as designated by the "D2" suffix in its part number. This value is guaranteed across temperature and supply voltage, and is used to ensure µP initialization completes before release - confirmed in both the Ordering Information table and Electrical Characteristics.
Is the MAX6314US44D2 compatible with the Motorola 68HC11 microcontroller?
Yes, the MAX6314US44D2 is explicitly designed for bidirectional reset compatibility with the Motorola 68HC11, as stated in its functional title ("68HC11/Bidirectional-Compatible µP Reset Circuit") and detailed in the Detailed Description section. Its RESET output architecture enables the 68HC11 to distinguish between internal and external reset sources via timing-based bus arbitration.
What package type is used for the MAX6314US44D2?
The MAX6314US44D2 is supplied in a SOT143 (also referenced as SOT-143) surface-mount package with four leads, measuring 1.3mm × 2.9mm. This is confirmed in the Package Information note, Pin Configuration diagram, and Absolute Maximum Ratings section of the datasheet.
MAX6314US44D2 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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6314US44D2 FAQ
1.How can I place an order for MAX6314US44D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6314US44D2 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 MAX6314US44D2 reliable?
The price and inventory of MAX6314US44D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6314US44D2 is usually 5 days.
3.What payment methods are accepted for MAX6314US44D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6314US44D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6314US44D2?
MAX6314US44D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6314US44D2 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 MAX6314US44D2?
For technical support, including MAX6314US44D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6314US44D2 requirements.
6.How does Aetrix verify that MAX6314US44D2 is sourced from the original manufacturer or authorized distributors?
All MAX6314US44D2 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 MAX6314US44D2 meets industry standards.
7.What is the process for return or replacement of MAX6314US44D2?
All MAX6314US44D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6314US44D2, 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 MAX6314US44D2 part is unused and in its original packaging.
Return procedure for MAX6314US44D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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