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Analog Devices Inc./Maxim Integrated MAX6314US28D4-T
- Part No.:
- MAX6314US28D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6314US28D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,944
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Product details
Overview
MAX6314US28D4-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., Motorola 68HC11). It features a factory-trimmed 2.80V reset threshold, 1120ms 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 MAX6314US28D4-T datasheet, MAX6314US28D4-T pinout, MAX6314US28D4-T application, or MAX6314US28D4-T equivalent, key selection considerations include its 2.80V VTH tolerance, 1120ms reset timeout, bidirectional RESET output architecture with integrated 4.7kΩ pullup + active P-channel transistor, immunity to short VCC transients, and compatibility with systems requiring manual reset debouncing without external components.
Technical Context
The MAX6314US28D4-T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 2.80V reset threshold, coupled with an internal timer that guarantees RESET remains asserted for ≥1120ms after VCC rises above threshold or MR deasserts. Its 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 - enabling fast rise times on capacitive reset buses.
This architecture directly supports bidirectional reset protocols (e.g., 68HC11), where the µP samples RESET state after releasing it to distinguish self-initiated vs. supervisor-initiated resets. The device includes a 63kΩ internal MR pullup, accepts logic-low manual reset inputs, and disables internal pullups during reset assertion to minimize current consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH | 2.80V nominal reset threshold, factory-laser-trimmed; enables precise brownout detection for 2.8V–3.0V supply rails. |
| tRP | ≥1120ms minimum reset timeout period; ensures sufficient hold time for full µP initialization after power recovery. |
| ICC | 5µA typical supply current at +25°C; supports ultra-low-power operation in battery-backed or energy-constrained systems. |
| VTH Accuracy | ±2.5% over -40°C to +85°C; maintains reliable reset assertion across industrial temperature range without calibration. |
| RESET Output | Bidirectional structure with 4.7kΩ passive pullup + P-channel active pullup; eliminates need for external pullup and solves rise-time issues on multi-device reset buses. |
| MR Input | Internal 63kΩ pullup; allows direct connection of momentary switch to GND without external components or debounce circuitry. |
| VCC Range | 1.0V to 5.5V operating supply; ensures functional RESET assertion down to 1V, supporting wide-input legacy and low-voltage designs. |
Pinout & Package
SOT143 package: 4-pin surface-mount, lead-free or leaded options, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input and reset threshold monitor node | Monitored rail input; internal laser-trimmed divider derives 2.80V reference; must be bypassed with 0.1µF capacitor for transient immunity. |
| MR | Manual reset input | Active-low; asserts reset when pulled low; internal 63kΩ pullup enables switch-to-GND implementation without external resistor. |
| RESET | Bidirectional reset output | Combines N-channel pulldown, 4.7kΩ pullup, and P-channel active pullup; interfaces directly with 68HC11-style bidirectional reset I/Os and supports multi-device bus timing. |
| GND | Ground reference | Return path for VCC, MR, and RESET; must be low-impedance to ensure accurate threshold sensing and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed VTH | 2.80V threshold set at wafer level with ±2.5% accuracy over temperature - eliminates post-manufacturing calibration and external resistor networks. |
| 1120ms reset timeout | Guaranteed minimum duration ensures µP core, peripherals, and PLLs fully stabilize before release - prevents premature code execution in complex embedded systems. |
| Bidirectional RESET architecture | Integrated 4.7kΩ pullup + 2µs active P-channel pullup enables sub-500ns rise time on 390pF bus capacitance - critical for correct 68HC11 reset-source discrimination. |
| Debounced manual reset | MR pin accepts direct switch-to-GND connection with no external RC network; internal 63kΩ pullup and glitch rejection (100ns) prevent false triggers. |
| Ultra-low ICC | 5µA typical quiescent current extends battery life in portable instruments and remote sensors - 10× lower than discrete reset solutions. |
Applications
| Portable Medical Monitors | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating from single Li-ion cell (2.8V–4.2V range) with strict power-up sequencing requirements. IC Role / Device Role / Timing Role: Supervises VCC during startup, brownout, and shutdown; asserts bidirectional RESET to ARM Cortex-M0+ MCU to enforce known initial state and prevent memory corruption. Use Value: 2.80V VTH matches minimum cell voltage; 1120ms tRP accommodates slow analog front-end stabilization; 5µA ICC minimizes standby drain. |
Use Scenario: DIN-rail mounted programmable logic controller with multiple I/O modules sharing a common reset bus subject to EMI and trace capacitance. IC Role / Device Role / Timing Role: Provides system-level reset coordination and manual reset via front-panel button; RESET output drives up to 5 devices on shared bus without external pullup. Use Value: Active P-channel pullup ensures RESET rises within two E-clock cycles (<500ns @4MHz) despite 390pF total bus capacitance - enabling correct reset-source identification by host µP. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: ANSI C12.20-compliant electricity meter with isolated RS-485 interface and tamper-detection circuitry requiring deterministic power-cycle recovery. IC Role / Device Role / Timing Role: Monitors main 3.3V supply derived from flyback converter; asserts RESET during AC line dropout or surge-induced brownout; supports manual reset via optical isolator. Use Value: ±2.5% VTH accuracy over -40°C to +85°C ensures consistent trip point across environmental stress; MR input immune to 100ns glitches avoids spurious resets during switching noise events. |
Use Scenario: 12V automotive body control unit (BCU) with LDO-regulated 2.8V rail powering CAN transceiver and microcontroller. IC Role / Device Role / Timing Role: Supervises 2.8V domain; provides reset pulse synchronized to ignition-on sequence and responds to load-dump transients on main 12V input via LDO dropout monitoring. Use Value: Immunity to short VCC transients (≤100ns) prevents false resets during alternator load dump; SOT143 package fits tight PCB space constraints near microcontroller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US28D4-T | Open-drain RESET output (no internal pullup); identical VTH, tRP, and accuracy specs. | Requires external 4.7kΩ pullup resistor; unsuitable for bidirectional reset protocols like 68HC11. | Select when interfacing with µPs having dedicated reset input (not bidirectional) and board layout allows external pullup placement. |
| TPS3808G28DBVR | Fixed 2.8V threshold, 1200ms timeout, but uses push-pull (not bidirectional) RESET; higher 8µA ICC. | Lacks MR debouncing and bidirectional capability; requires external RC for manual reset; not drop-in for 68HC11 systems. | Choose for cost-sensitive, non-bidirectional applications where push-pull drive and slightly longer timeout are acceptable. |
Compared with MAX6314US28D4-T, MAX6315US28D4-T removes the bidirectional RESET structure but retains identical monitoring specs - making it suitable only where external pullup is acceptable and µP reset I/O is unidirectional. TPS3808G28DBVR offers longer timeout and TI's production support but sacrifices bidirectional functionality and adds current overhead, limiting use in low-power or 68HC11-compatible designs.
Availability
MAX6314US28D4-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 assurance, and guaranteed lead-free sourcing.
Supply support for MAX6314US28D4-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX6314 series was designed specifically to solve bidirectional reset interface challenges in µP-based systems - targeting applications like 68HC11-based controllers where reset source discrimination is essential for fault diagnostics and recovery.
FAQ
What is the exact reset threshold voltage for MAX6314US28D4-T?
The MAX6314US28D4-T has a factory-trimmed nominal reset threshold voltage 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 specified in the Ordering Information table; it is not adjustable and applies directly to the VCC supply monitored by the device.
Does MAX6314US28D4-T support bidirectional reset communication with the Motorola 68HC11?
Yes, the MAX6314US28D4-T is explicitly designed for bidirectional reset compatibility with the Motorola 68HC11 and similar µPs. Its RESET output integrates a 4.7kΩ pullup resistor and a P-channel active pullup transistor that enables the µP to detect whether reset was initiated externally (by the MAX6314US28D4-T) or internally (by watchdog or software), based on the state of RESET after release.
What is the minimum reset timeout period for MAX6314US28D4-T?
The MAX6314US28D4-T provides a minimum reset timeout period of 1120ms. This is the guaranteed minimum duration that the RESET output remains asserted after VCC rises above the 2.80V threshold or after the MR input is deasserted - ensuring sufficient time for complete µP and peripheral initialization before program execution resumes.
Can MAX6314US28D4-T operate with supply voltages below 2.8V?
Yes, the MAX6314US28D4-T operates from VCC = 1.0V to 5.5V. While its reset function activates when VCC falls below 2.80V, the device continues to assert RESET down to VCC = 1.0V. Below 1.0V, RESET becomes high-impedance; for validity down to 0V, a 100kΩ external pull-down resistor on RESET is recommended per the datasheet Figure 3.
Is an external pullup resistor required for MAX6314US28D4-T's RESET pin?
No external pullup resistor is required for MAX6314US28D4-T. Its RESET output includes an integrated 4.7kΩ passive pullup resistor and a P-channel active pullup transistor - both optimized to meet timing requirements of bidirectional reset protocols without additional components. Adding an external pullup would conflict with the internal design and is not recommended.
MAX6314US28D4-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:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6314US28D4-T FAQ
1.How can I place an order for MAX6314US28D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6314US28D4-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 MAX6314US28D4-T reliable?
The price and inventory of MAX6314US28D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6314US28D4-T is usually 5 days.
3.What payment methods are accepted for MAX6314US28D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6314US28D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6314US28D4-T?
MAX6314US28D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6314US28D4-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 MAX6314US28D4-T?
For technical support, including MAX6314US28D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6314US28D4-T requirements.
6.How does Aetrix verify that MAX6314US28D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6314US28D4-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 MAX6314US28D4-T meets industry standards.
7.What is the process for return or replacement of MAX6314US28D4-T?
All MAX6314US28D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6314US28D4-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 MAX6314US28D4-T part is unused and in its original packaging.
Return procedure for MAX6314US28D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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