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Analog Devices Inc./Maxim Integrated MAX6314US31D4+
- Part No.:
- MAX6314US31D4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6314US31D4+.pdf
- Description:
- MAX6314 68HC11/BIDIRECTIONAL-COM
- Quantity:
- Payment:
- Shipping:
Inventory:7,005
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Product details
Overview
MAX6314US31D4+ 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 compatible reset I/Os (e.g., Motorola 68HC11). It features a factory-trimmed 3.08V reset threshold, 1120ms 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 and brownout reset control.
For engineers reviewing the MAX6314US31D4+ datasheet, MAX6314US31D4+ pinout, MAX6314US31D4+ application, or MAX6314US31D4+ equivalent, key selection criteria include bidirectional RESET compatibility, precise 3.08V VTH tolerance, long 1120ms timeout for slow-ramping systems, 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 MAX6314US31D4+ implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 3.08V reset threshold, maintaining ±2.5% accuracy over –40°C to +85°C. Its reset generator uses an internal timer to hold RESET low for ≥1120ms after VCC rises above threshold or MR deasserts.
The RESET output combines an N-channel pulldown, a 4.7kΩ passive pullup, and a P-channel active pullup enabled for 2µs after RESET crosses 0.5V - enabling fast rise times (<350ns typical) even with >390pF bus capacitance, critical for multi-device reset buses on high-speed µPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH Nominal | 3.08V - factory-trimmed threshold ensures accurate reset assertion during 3.3V system brownout detection. |
| tRP Min | 1120ms - guarantees sufficient reset hold time for slow power-rail stabilization in battery-backed or low-leakage systems. |
| ICC | 5µA - enables multi-year operation in coin-cell–powered portable instruments without compromising supervision integrity. |
| VTH Accuracy | ±1.8% at +25°C - eliminates need for external calibration or margining in 3.3V rail monitoring applications. |
| RESET Output Type | Bidirectional with integrated 4.7kΩ pullup + P-channel active pullup - directly interfaces 68HC11-style µP reset pins without external components. |
| MR Input | Internal 63kΩ pullup - supports momentary switch-to-GND manual reset with no external parts or debounce circuitry required. |
| Immunity | Immune to VCC transients <100µs (at 100mV overdrive) - prevents false resets from switching noise or ESD-induced dips. |
Pinout & Package
SOT143 (4-pin, 1.3mm × 2.1mm, 0.95mm height) surface-mount package with gull-wing leads, rated for –40°C to +85°C operation and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply & Threshold Monitor Input | Primary power input; internally monitored to trigger reset when falling below 3.08V (±2.5% over temp). |
| MR | Manual Reset Input | Active-low input with internal 63kΩ pullup; asserts reset when pulled low and holds reset for full 1120ms timeout after release. |
| RESET | Bidirectional Reset Output | Open-drain–compatible output with integrated 4.7kΩ pullup + P-channel active pullup; sinks current when low, drives high via dual-path pullup. |
| GND | Ground Reference | Return path for VCC, MR, and RESET; must be low-impedance connection to maintain threshold accuracy and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed VTH | 3.08V with ±1.8% accuracy at +25°C enables direct use in 3.3V systems without external resistor networks or recalibration. |
| 1120ms Timeout Period | Longest standard delay option ensures robust reset hold time for systems with slow power-up sequencing or large decoupling capacitance. |
| Bidirectional RESET Architecture | Combines N-channel sink, 4.7kΩ pullup, and 2µs P-channel boost to meet 68HC11 timing requirements (<500ns rise to 0.8×VCC) even with >390pF bus load. |
| No External Components Required | Integrated MR pullup (63kΩ), RESET pullup (4.7kΩ), and active pullup eliminate BOM cost, board space, and assembly steps for basic supervision. |
| Low Supply Current | 5µA max ICC allows deployment in always-on battery monitoring circuits without measurable impact on shelf life. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable glucose monitors powered by CR2032 coin cells with intermittent BLE transmission and deep-sleep modes. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts reset during battery voltage sag below 3.08V to prevent corrupted sensor readings or flash writes. Use Value: 5µA quiescent current extends battery life beyond 2 years; 1120ms timeout ensures MCU completes safe shutdown before power collapse. |
Use Scenario: DIN-rail mounted I/O expansion modules operating in noisy factory environments with fluctuating 24VDC input. IC Role / Device Role / Timing Role: Monitors local 3.3V logic rail derived from isolated DC/DC converter; provides glitch-immune reset during line transients. Use Value: Immunity to sub-100µs VCC dips prevents spurious resets from motor drive noise; bidirectional RESET supports diagnostic firmware that distinguishes supervisor vs. watchdog resets. |
| Smart Utility Meters | Automotive Body Control Modules (BCM) |
|
Use Scenario: AMI meters with supercapacitor backup and cold-start capability under low-temperature grid conditions. IC Role / Device Role / Timing Role: Resets meter SoC when main 3.3V rail drops during capacitor discharge or cold-temperature voltage droop. Use Value: ±2.5% VTH accuracy over –40°C to +85°C ensures consistent trip point across automotive temperature range; SOT143 footprint minimizes PCB area in space-constrained meter designs. |
Use Scenario: BCMs managing door locks, lighting, and window controls powered from vehicle battery with wide voltage range (6V–16V). IC Role / Device Role / Timing Role: Supervises regulated 3.3V domain feeding CAN transceivers and microcontroller; debounced MR supports service-mode entry via physical button. Use Value: Internal MR pullup eliminates external resistor; 1120ms timeout accommodates slow wake-up of CAN PHY after ignition-on, preventing communication loss during initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US31D4+ | Open-drain RESET output (no internal pullup); requires external 4.7kΩ pullup resistor. | Lacks bidirectional interface support; unsuitable for 68HC11 or other µPs requiring active pullup. | Select only if system uses open-drain reset topology and external pullup is acceptable. |
| TPS3808G33DBVR | Fixed 3.3V threshold (not 3.08V); 200ms default timeout (adjustable via capacitor); higher 12µA ICC. | Designed for TI ecosystem; lacks MR debounce and bidirectional optimization; requires external timing cap. | Prefer when 3.3V exact threshold is required and longer timeout is managed externally. |
Compared with MAX6314US31D4+, MAX6315US31D4+ saves no BOM cost (adds external resistor) and cannot drive bidirectional reset lines, while TPS3808G33DBVR trades precision 3.08V brownout detection and integrated pullup for programmability and TI-specific integration - making MAX6314US31D4+ optimal for compact, low-power, 68HC11-compatible designs needing guaranteed 1120ms hold time.
Availability
MAX6314US31D4+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart utility meters, and automotive body control modules requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MAX6314US31D4+ 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, communications, computing, and consumer applications.
The MAX6314 series was designed specifically for microprocessor supervision in space- and power-constrained systems, emphasizing precision voltage monitoring, bidirectional reset compatibility, and zero-external-component operation.
FAQ
What is the exact reset threshold voltage for MAX6314US31D4+?
The MAX6314US31D4+ has a factory-trimmed nominal reset threshold voltage of 3.08V, with ±1.8% accuracy at +25°C and ±2.5% over the full –40°C to +85°C operating temperature range. This value is laser-trimmed during production and verified per the Electrical Characteristics table in the official MAX6314 datasheet Rev 2 (12/2005).
Does MAX6314US31D4+ require an external pull-up resistor on the RESET pin?
No, the MAX6314US31D4+ does not require an external pull-up resistor. It integrates a 4.7kΩ passive pull-up resistor in parallel with a P-channel active pull-up transistor, enabling direct interface with bidirectional reset pins like those on the Motorola 68HC11. This eliminates external components and ensures fast RESET rise time even under capacitive loads up to 390pF.
What is the minimum reset timeout period specified for MAX6314US31D4+?
The MAX6314US31D4+ is configured with a minimum reset timeout period (tRP) of 1120ms. This is the longest standard timeout option in the MAX6314 family and is guaranteed over temperature and process variation. The actual timeout may extend slightly (up to ~1570ms typical) but will never fall below 1120ms under specified conditions.
Can MAX6314US31D4+ be used with microcontrollers other than the 68HC11?
Yes, the MAX6314US31D4+ can be used with any microcontroller featuring a bidirectional reset I/O pin that accepts an active-pullup reset signal. While optimized for the 68HC11 timing sequence (e.g., two E-clock sampling), its RESET architecture - combining N-channel sink, 4.7kΩ pullup, and 2µs P-channel boost - meets timing requirements for similar µPs including certain Renesas H8 and legacy STMicroelectronics devices with compatible reset protocols.
Is MAX6314US31D4+ pin-compatible with MAX811?
Yes, the MAX6314US31D4+ is explicitly stated in the datasheet to be pin-compatible with the MAX811. Both devices share identical SOT143 pinout (VCC, MR, RESET, GND), same footprint, and compatible electrical behavior - though MAX6314US31D4+ adds bidirectional RESET drive capability and offers selectable timeout periods, whereas MAX811 provides only fixed 140ms timeout and open-drain RESET.
MAX6314US31D4+ 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:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Bidirectional
- Reset:
- Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6314US31D4+ FAQ
1.How can I place an order for MAX6314US31D4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6314US31D4+ 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 MAX6314US31D4+ reliable?
The price and inventory of MAX6314US31D4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6314US31D4+ is usually 5 days.
3.What payment methods are accepted for MAX6314US31D4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6314US31D4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6314US31D4+?
MAX6314US31D4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6314US31D4+ 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 MAX6314US31D4+?
For technical support, including MAX6314US31D4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6314US31D4+ requirements.
6.How does Aetrix verify that MAX6314US31D4+ is sourced from the original manufacturer or authorized distributors?
All MAX6314US31D4+ 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 MAX6314US31D4+ meets industry standards.
7.What is the process for return or replacement of MAX6314US31D4+?
All MAX6314US31D4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6314US31D4+, 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 MAX6314US31D4+ part is unused and in its original packaging.
Return procedure for MAX6314US31D4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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