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Analog Devices Inc./Maxim Integrated MAX6314US28D3
- Part No.:
- MAX6314US28D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6314US28D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,597
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Product details
Overview
MAX6314US28D3 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., 68HC11). It features a factory-trimmed 2.80V reset threshold, 140ms minimum reset timeout period, ±2.5% threshold accuracy over temperature, 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 MAX6314US28D3 datasheet, MAX6314US28D3 pinout, MAX6314US28D3 application, or MAX6314US28D3 equivalent, key selection considerations include its bidirectional RESET output architecture, 2.80V threshold tolerance, 140ms timeout timing, immunity to short VCC transients, and compatibility with systems requiring manual reset debouncing without external components.
Technical Context
The MAX6314US28D3 implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 2.80V reset threshold, and an internal timer that guarantees RESET remains asserted for ≥140ms after VCC rises above threshold or MR deasserts. Its RESET output combines a 4.7kΩ pull-up resistor with a p-channel active pullup transistor to meet fast rise-time requirements on shared reset buses.
This device uses a transition edge flip-flop and 2µs one-shot to enable rapid low-to-high RESET transitions-even with multiple devices and stray capacitance-while maintaining compatibility with µPs like the 68HC11 that distinguish external vs. internal reset sources by sampling RESET state after release. MR includes a 63kΩ internal pullup and supports noise-immune manual reset via momentary switch to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.80V nominal, ±2.5% over -40°C to +85°C - ensures reliable detection of brownout at precisely defined VCC level |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for µP initialization before release |
| Supply Current | 5µA typical at +25°C - enables ultra-low-power operation in battery-backed systems |
| VCC Operating Range | 1.0V to 5.5V - supports wide input supply range including single-cell Li-ion and 3.3V/5V logic rails |
| MR Input Threshold | 0.3 × VCC (low), 0.7 × VCC (high) - provides robust noise margin for manual reset assertion |
| RESET Output Structure | Bidirectional with 4.7kΩ passive pullup + p-channel active pullup - eliminates need for external pullup and meets µP timing requirements |
| MR Glitch Rejection | 100ns - rejects EMI-induced false triggers on manual reset line |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage and reset threshold monitor input | Primary power rail connection; internally monitored to trigger reset when falling below 2.80V |
| MR | Manual reset input | Active-low input with 63kΩ internal pullup; asserts reset when pulled low, no external debounce required |
| RESET | Active-low bidirectional reset output | Combines n-channel pulldown + p-channel pullup + 4.7kΩ resistor to interface directly with 68HC11-style bidirectional reset pins |
| GND | Ground reference | Return path for all internal circuitry and reset output current sink/source |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional RESET output | Enables direct interface with µPs like 68HC11 that sample reset source by monitoring RESET state transitions |
| Factory-trimmed 2.80V threshold | Eliminates external resistor network and calibration, reducing BOM count and layout area |
| 140ms minimum reset timeout | Ensures µP completes power stabilization and internal initialization before releasing reset |
| 5µA quiescent current | Extends battery life in portable instruments and handheld controllers without compromising supervision reliability |
| Immunity to short VCC transients | Rejects <100ns glitches down to 10mV below threshold - prevents spurious resets in noisy power environments |
Applications
| Portable Medical Monitors | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-powered ECG or glucose meter operating from single Li-ion cell with variable VCC during discharge. IC Role / Device Role / Timing Role: Supervises VCC to detect brownout before critical sensor data corruption; asserts RESET to halt µP until stable supply resumes. Use Value: Prevents firmware crash and data loss during low-battery conditions using precise 2.80V threshold aligned with battery cutoff voltage. |
Use Scenario: DIN-rail mounted controller exposed to industrial power fluctuations and EMI. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail and provides glitch-immune reset assertion during line sags or switching noise events. Use Value: 100ns MR glitch rejection and 140ms timeout ensure deterministic recovery without repeated resets under transient stress. |
| Handheld Test Equipment | Smart Energy Meters |
|
Use Scenario: Field-deployable multimeter with pushbutton-initiated self-test and calibration routines. IC Role / Device Role / Timing Role: Provides debounced manual reset via front-panel button while maintaining automatic VCC supervision. Use Value: Internal 63kΩ MR pullup and no-external-component design reduce PCB space and eliminate debounce RC network. |
Use Scenario: Revenue-grade meter with tamper detection and secure boot requiring validated power integrity. IC Role / Device Role / Timing Role: Ensures µC enters known state only after VCC exceeds 2.80V and remains stable for ≥140ms post-power-up. Use Value: ±2.5% threshold accuracy over temperature guarantees consistent reset behavior across -25°C to +70°C field operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US28D3-T | Open-drain RESET output (no internal pullup); same 2.80V threshold and 140ms timeout | Requires external pullup resistor; suitable for systems where bidirectional reset sampling is not needed | Select when interfacing with µPs having unidirectional reset inputs or when board-level pullup already exists |
| TPS3808G18DBVR | Fixed 1.8V reset threshold, 200ms timeout, 1.4µA IQ, SOT-23-5 package | Lower threshold and higher accuracy (±0.5%), but incompatible with 2.80V system rails and bidirectional timing protocols | Choose only if redesigning for lower-voltage µP and prioritizing ultra-low IQ over 68HC11 compatibility |
Compared with MAX6314US28D3, MAX6315US28D3 lacks the bidirectional RESET structure and requires external biasing, while TPS3808G18DBVR offers superior accuracy and lower current but cannot replace it in 2.80V systems or applications requiring 68HC11-style reset arbitration.
Availability
MAX6314US28D3 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, handheld test equipment, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6314US28D3 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX6314 family delivers precision, low-power µP supervision with factory-trimmed thresholds and programmable timeouts-targeted specifically at systems needing reliable, component-minimized reset control for legacy and modern microcontrollers.
FAQ
What is the exact reset threshold voltage for MAX6314US28D3?
The MAX6314US28D3 has a factory-trimmed nominal reset threshold of 2.80V, with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during manufacturing and does not require external calibration. The threshold is specified relative to VCC and remains stable across supply variations and thermal drift, making MAX6314US28D3 suitable for applications where precise brownout detection at 2.80V is required.
Does MAX6314US28D3 support bidirectional reset communication with the 68HC11?
Yes, MAX6314US28D3 is explicitly designed for bidirectional reset compatibility with the Motorola 68HC11 and similar µPs. Its RESET output integrates a 4.7kΩ pull-up resistor and a p-channel active pullup transistor, enabling the µP to drive RESET low and then sample its state to distinguish between internal and external reset sources. This architecture is confirmed in the functional diagram, timing diagrams, and application notes for MAX6314US28D3.
What is the reset timeout period for MAX6314US28D3, and is it guaranteed?
The MAX6314US28D3 provides a minimum reset timeout period of 140ms after VCC rises above the 2.80V threshold or after the manual reset (MR) input is deasserted. This value is guaranteed across temperature and supply voltage per the Electrical Characteristics table. The actual timeout may be longer due to process variation, but never shorter than 140ms - ensuring robust µP initialization in all operating conditions for MAX6314US28D3.
Can MAX6314US28D3 operate from a 1.8V supply?
No, MAX6314US28D3 requires a minimum VCC of 1.0V to assert RESET, but its 2.80V reset threshold means it will continuously assert RESET below that level. For reliable supervision, VCC must reach at least 2.80V to release reset. While the device draws only 5µA at low VCC, it cannot monitor or release reset below its programmed threshold - so MAX6314US28D3 is not suitable for 1.8V-only systems unless used with an external voltage translator or supervisor with matching threshold.
Is an external pull-up resistor required for the RESET pin of MAX6314US28D3?
No, an external pull-up resistor is not required for MAX6314US28D3. The device integrates both a 4.7kΩ passive pull-up resistor and a p-channel active pull-up transistor on the RESET pin, enabling direct interface with bidirectional µP reset inputs. This integrated design eliminates the need for external components, reduces PCB area, and ensures fast rise time even with multiple devices on the reset bus - a key feature confirmed in the Typical Operating Circuit and Reset Output section of the MAX6314US28D3 datasheet.
MAX6314US28D3 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:
- 2.8V
- 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-23-4
MAX6314US28D3 FAQ
1.How can I place an order for MAX6314US28D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6314US28D3 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 MAX6314US28D3 reliable?
The price and inventory of MAX6314US28D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6314US28D3 is usually 5 days.
3.What payment methods are accepted for MAX6314US28D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6314US28D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6314US28D3?
MAX6314US28D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6314US28D3 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 MAX6314US28D3?
For technical support, including MAX6314US28D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6314US28D3 requirements.
6.How does Aetrix verify that MAX6314US28D3 is sourced from the original manufacturer or authorized distributors?
All MAX6314US28D3 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 MAX6314US28D3 meets industry standards.
7.What is the process for return or replacement of MAX6314US28D3?
All MAX6314US28D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6314US28D3, 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 MAX6314US28D3 part is unused and in its original packaging.
Return procedure for MAX6314US28D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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