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Analog Devices Inc./Maxim Integrated MAX6314US28D2-T
- Part No.:
- MAX6314US28D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6314US28D2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,360
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Product details
Overview
MAX6314US28D2-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 compatible reset I/Os (e.g., 68HC11). It features a factory-trimmed 2.80V reset threshold, 20ms 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 MAX6314US28D2-T datasheet, MAX6314US28D2-T pinout, MAX6314US28D2-T application, or MAX6314US28D2-T equivalent, key selection criteria include bidirectional RESET compatibility, precise 2.80V VTH tolerance over temperature, guaranteed reset assertion down to VCC = 1V, 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 MAX6314US28D2-T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider setting nominal VTH = 2.80V, ±2.5% accuracy across –40°C to +85°C. Its reset generator includes an internally programmed 20ms (minimum) timeout timer that restarts on every VCC dip below threshold or MR assertion.
The RESET output combines an n-channel pulldown, a 4.7kΩ passive pullup, and a p-channel active pullup enabled for 2µs after RESET rises above 0.5V - enabling fast rise time (<350ns typical into 100pF) even with multiple devices on the bus. MR includes a 63kΩ internal pullup and 100ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH Nominal | 2.80V - factory-laser-trimmed threshold for reset assertion during VCC brownout |
| tRP Min | 20ms - guaranteed minimum reset pulse width after VCC recovery or MR release |
| VTH Accuracy | ±1.8% at +25°C - ensures tight supply-margin detection without external calibration |
| ICC | 5µA - enables multi-year battery life in portable monitoring applications |
| RESET Output Type | Bidirectional with integrated 4.7kΩ pullup + active p-channel - eliminates external components for 68HC11-style µP interfaces |
| MR Input Threshold | VIL = 0.8V - compatible with standard CMOS logic levels; internal 63kΩ pullup allows NC connection |
| VCC Range | 1.0V to 5.5V - supports operation down to near-zero VCC while maintaining valid RESET state |
Pinout & Package
SOT143 (4-pin, 1.3mm × 2.9mm, 0.95mm height), surface-mount package rated for –40°C to +85°C operation. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 4) | Supply & Monitor Input | Primary power input; internally monitored by precision voltage divider to trigger reset when falling below 2.80V |
| MR (Pin 3) | Manual Reset Input | Active-low input; asserts reset when pulled ≤0.8V; internal 63kΩ pullup enables direct switch-to-GND use without external resistor |
| RESET (Pin 2) | Bidirectional Reset I/O | Open-drain–compatible output with integrated 4.7kΩ pullup + p-channel active pullup; sinks current when low, drives high via dual-path for fast rise time |
| GND (Pin 1) | Ground Reference | Common return path for VCC, MR, and RESET; required for accurate threshold sensing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed VTH | 2.80V with ±1.8% accuracy at +25°C - eliminates need for external resistor networks or calibration |
| Bidirectional RESET Architecture | Integrated 4.7kΩ pullup + 2µs p-channel active pullup - ensures sub-500ns rise time into 100pF load, enabling reliable multi-device reset bus operation |
| Low-Power Operation | 5µA typical supply current - extends battery life in portable instrumentation and handheld controllers |
| Transient Immunity | Rejects VCC glitches <100ns at 100mV overdrive - prevents false resets in electrically noisy environments |
| Manual Reset Integration | MR with 63kΩ internal pullup and 100ns glitch rejection - supports momentary switch interface without external debounce components |
Applications
| Portable Medical Monitors | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-powered ECG or glucose meter operating from single Li-ion cell with varying VCC (3.0V–4.2V) during discharge. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset if VCC drops below 2.80V, preventing corrupted memory writes or unstable ADC operation. Use Value: Guarantees clean boot and safe shutdown at defined 2.80V margin, with 20ms hold time ensuring µP completes critical save routines before power loss. |
Use Scenario: DIN-rail mounted programmable logic controller exposed to 24V DC supply ripple and transient surges. IC Role / Device Role / Timing Role: Voltage supervisor monitoring regulated 5V rail derived from industrial SMPS; detects brownouts and initiates controlled firmware recovery. Use Value: Bidirectional RESET interface allows PLC µP to distinguish self-initiated watchdog resets from external power-failure resets, enabling differentiated fault logging and recovery paths. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: ANSI C12.22-compliant electricity meter with backup supercapacitor sustaining real-time clock during AC mains outage. IC Role / Device Role / Timing Role: Monitors 3.3V system rail; asserts reset when capacitor discharge drops VCC below 2.80V, triggering RTC save and secure shutdown. Use Value: 5µA quiescent current minimizes supercapacitor drain; ±2.5% VTH stability over –40°C to +85°C ensures consistent behavior across environmental extremes. |
Use Scenario: 12V automotive body control unit (BCU) with LDO-regulated 3.3V domain powering CAN transceiver and microcontroller. IC Role / Device Role / Timing Role: Detects LDO dropout during cold-crank (battery dip to 6V) and asserts reset before µP executes invalid instructions. Use Value: Immunity to 100ns VCC transients prevents spurious resets during ignition switching noise; MR pin enables service-mode forced reset via diagnostic tool. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US28D2-T | Open-drain RESET output (no internal pullup); identical VTH = 2.80V and tRP = 20ms | Requires external 4.7kΩ pullup; not suitable for bidirectional µP reset I/Os like 68HC11 | Select only when interfacing with µPs having dedicated reset input (not bidirectional) and board space allows external resistor |
| TPS3808G28DBVR | Push-pull RESET output; 2.80V threshold; 20ms timeout; 1.6µA ICC; SOT-23-5 package | Lacks bidirectional capability and active pullup; incompatible with 68HC11-style reset arbitration protocol | Choose for ultra-low-power systems where bidirectional reset signaling is unnecessary and smaller SOT-23 footprint is preferred |
Compared with MAX6314US28D2-T, MAX6315US28D2-T requires external pull-up and cannot support reset-source arbitration, while TPS3808G28DBVR offers lower current but lacks the active pullup timing control essential for multi-device reset buses - making MAX6314US28D2-T uniquely suited for 68HC11-compatible designs.
Availability
MAX6314US28D2-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.
Supply support for MAX6314US28D2-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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6314 family was designed specifically to simplify power-supply monitoring in microprocessor-based systems requiring precise, low-power, and bidirectional reset signaling - targeting cost-sensitive, space-constrained embedded designs.
FAQ
What is the exact reset threshold voltage for MAX6314US28D2-T?
The MAX6314US28D2-T has a factory-laser-trimmed nominal reset threshold voltage of 2.80V, with ±1.8% accuracy at +25°C and ±2.5% over the full –40°C to +85°C operating range. This value is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet, and applies exclusively to this specific variant (D2-T suffix denotes 20ms timeout).
Does MAX6314US28D2-T require an external pull-up resistor on the RESET pin?
No, MAX6314US28D2-T does not require an external pull-up resistor. It integrates a 4.7kΩ passive pull-up in parallel with a p-channel active pull-up transistor, enabling direct connection to bidirectional µP reset pins like those on the 68HC11. The internal pull-up is automatically disconnected when RESET is asserted, minimizing current consumption.
What is the minimum reset timeout period specified for MAX6314US28D2-T?
The minimum reset timeout period for MAX6314US28D2-T is 20ms, as indicated by the "D2" suffix in the part number and confirmed in the Electrical Characteristics table under parameter tRP. This guaranteed minimum duration ensures sufficient time for microprocessor initialization and critical register saves after power recovery or manual reset release.
Can MAX6314US28D2-T interface with microcontrollers other than the 68HC11?
Yes, MAX6314US28D2-T can interface with any microcontroller featuring a bidirectional reset I/O pin that accepts open-drain–compatible signaling. Its RESET output architecture - combining n-channel sink, 4.7kΩ pull-up, and active p-channel pull-up - is explicitly designed for such interfaces, including derivatives of the 68HC11 family and other µPs implementing similar reset arbitration protocols.
Is MAX6314US28D2-T available in lead-free packaging?
Yes, MAX6314US28D2-T is available in lead-free packaging. Per the Ordering Information note, lead-free versions are ordered by replacing the "-T" suffix with "+T", resulting in MAX6314US28D2+T. Both variants use the same SOT143 package and share identical electrical specifications and thermal ratings.
MAX6314US28D2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6314US28D2-T FAQ
1.How can I place an order for MAX6314US28D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6314US28D2-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 MAX6314US28D2-T reliable?
The price and inventory of MAX6314US28D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6314US28D2-T is usually 5 days.
3.What payment methods are accepted for MAX6314US28D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6314US28D2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6314US28D2-T?
MAX6314US28D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6314US28D2-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 MAX6314US28D2-T?
For technical support, including MAX6314US28D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6314US28D2-T requirements.
6.How does Aetrix verify that MAX6314US28D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6314US28D2-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 MAX6314US28D2-T meets industry standards.
7.What is the process for return or replacement of MAX6314US28D2-T?
All MAX6314US28D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6314US28D2-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 MAX6314US28D2-T part is unused and in its original packaging.
Return procedure for MAX6314US28D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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