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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 RESET CIRCUIT 2.80V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,791
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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., 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 pullup, MR debounce capability, and immunity to short VCC transients.
Technical Context
The MAX6314US28D4+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 2.80V reset threshold, coupled with an internal timer that guarantees RESET remains asserted for ≥1120ms after VCC rises above threshold or manual reset deassertion. 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 time on capacitive reset buses.
This architecture directly supports bidirectional reset protocols used by Motorola 68HC11 and similar µPs: the device allows external devices to pull RESET low while ensuring rapid, deterministic high-to-low and low-to-high transitions even with multiple loads and stray capacitance. The MR input includes a 63kΩ internal pullup and accepts logic-low manual reset pulses without external debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH | 2.80V nominal reset threshold; factory-laser-trimmed for ±2.5% accuracy across -40°C to +85°C - ensures consistent brownout detection at defined supply level. |
| tRP | 1120ms minimum reset timeout period; guarantees RESET remains asserted long enough for full µP initialization and peripheral stabilization after power recovery. |
| ICC | 5µA typical supply current at +25°C; enables multi-year battery life in portable systems with continuous supervision. |
| RESET Output Type | Bidirectional-compatible with integrated 4.7kΩ pullup + p-channel active pullup; eliminates need for external pullup and ensures <500ns rise time under 390pF load - critical for multi-device reset bus timing. |
| MR Input | Logic-compatible manual reset input with 63kΩ internal pullup; accepts direct switch-to-GND connection; no external components required for debounced reset initiation. |
| VCC Range | 1.0V to 5.5V operating supply range; RESET guaranteed low down to VCC = 1V, supporting supervision of low-voltage µPs and mixed-supply systems. |
| Transient Immunity | Immune to VCC negative transients ≤100µs at 100mV overdrive; prevents false resets during switching noise or ESD events without external filtering. |
Pinout & Package
SOT143 (4-pin, surface-mount) package with 1.3mm × 2.1mm footprint and 0.95mm height; rated for -40°C to +85°C ambient operation; lead-free per RoHS (indicated by "+T" suffix).
| 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; must be decoupled with 0.1µF capacitor near pin. |
| MR | Manual reset input | Active-low input; asserts reset when pulled low; includes 63kΩ internal pullup - connect to GND via momentary switch if used; left open if unused. |
| RESET | Active-low bidirectional reset output | Combines n-channel pulldown, 4.7kΩ passive pullup, and p-channel active pullup; interfaces directly with 68HC11-style bidirectional reset pins without external components. |
| GND | Ground reference | System ground return for all internal circuitry; must be connected to lowest-impedance system ground plane 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 full temperature range - eliminates calibration and reduces BOM count. |
| Bidirectional RESET output | Integrated 4.7kΩ pullup + p-channel active pullup enables µP-initiated reset acknowledgment and fast bus recovery - solves timing failure in multi-device reset networks. |
| 1120ms reset timeout | Guaranteed minimum assertion time ensures reliable µP and peripheral initialization after brownout recovery - avoids premature code execution. |
| 5µA quiescent current | Ultra-low ICC supports always-on supervision in energy-constrained applications like coin-cell-powered instruments and IoT edge sensors. |
| MR debounce & pullup | 63kΩ internal MR pullup and glitch rejection (100ns) allow direct switch interface - removes need for RC filters or Schmitt triggers in manual reset paths. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered handheld ECG or glucose meter with cold-start requirement and intermittent power interruptions. IC Role / Device Role / Timing Role: Supervises 3.3V main supply and asserts reset until stable; provides 1120ms timeout to complete ADC calibration and display initialization. Use Value: Prevents corrupted measurements or display artifacts during brownout recovery by guaranteeing full µP and analog subsystem readiness before firmware execution. |
Use Scenario: DIN-rail mounted PLC module operating in electrically noisy factory environments with fluctuating 24VDC-derived 3.3V rails. IC Role / Device Role / Timing Role: Monitors isolated 3.3V domain; detects dips caused by relay switching or motor startup; holds reset for 1120ms to prevent spurious I/O state changes. Use Value: Eliminates false I/O toggling and communication loss by maintaining deterministic reset hold time despite transient-induced VCC sags. |
| Smart Energy Meters | Automotive Body Control Units (BCU) |
Use Scenario: ANSI C12.20-compliant electricity meter with dual-supply (battery + line) and tamper-detection circuitry. IC Role / Device Role / Timing Role: Supervises 2.8V backup rail; asserts reset on battery voltage decay; uses MR for secure firmware update initiation. Use Value: Ensures meter retains metrology integrity during power switchover by enforcing clean restart before real-time clock and measurement engine resume. |
Use Scenario: 12V automotive body controller managing door locks, lighting, and CAN transceivers with strict ASIL-B reset timing requirements. IC Role / Device Role / Timing Role: Monitors 3.3V domain derived from buck converter; provides 2.80V threshold aligned with MCU brownout spec; supports manual reset via diagnostic tool. Use Value: Meets ISO 16750-2 pulse immunity and cold-crank voltage drop requirements by rejecting sub-100µs transients and holding reset through 1120ms recovery window. |
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 (2.80V), tRP (1120ms), and package. | Requires external 4.7kΩ pullup resistor; not compatible with bidirectional reset protocols like 68HC11. | Select when interfacing with standard open-drain µP reset inputs or when board layout requires separate pullup placement. |
| TPS3808G28DBVR | Push-pull RESET output; 2.80V threshold; 1200ms timeout; 1.5µA ICC; SOT-23-5 package. | No MR input; no bidirectional support; higher accuracy (±0.5%) but lacks manual reset functionality. | Select when ultra-low current and tighter threshold tolerance are prioritized over manual reset and bidirectional compatibility. |
Compared with MAX6314US28D4+T, MAX6315US28D4+T removes the bidirectional capability but simplifies design for open-drain systems, while TPS3808G28DBVR offers lower current and better accuracy but sacrifices MR and bidirectional operation - choice depends on µP interface type and feature trade-offs.
Availability
MAX6314US28D4+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply with guaranteed long-term lifecycle support.
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) designs precision analog, mixed-signal, and power management ICs for industrial, computing, communications, and consumer applications.
The MAX6314 family delivers cost-effective, low-power µP supervisory circuits with factory-trimmed thresholds and programmable timeouts - engineered for reliable power monitoring in space- and energy-constrained embedded systems.
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 operating temperature range (-40°C to +85°C). This value is laser-trimmed during manufacturing and specified in the Ordering Information table - it is not adjustable and applies specifically to the MAX6314US28D4+T variant.
Does MAX6314US28D4+T support bidirectional reset communication with the 68HC11 microcontroller?
Yes, the MAX6314US28D4+T is explicitly designed for bidirectional reset compatibility with the Motorola 68HC11 and similar µPs. Its RESET output integrates both an n-channel pulldown and a p-channel active pullup in parallel with a 4.7kΩ resistor, enabling the µP to drive the line low and detect external reset sources - a core requirement of the 68HC11 reset protocol.
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 duration RESET remains asserted after VCC rises above 2.80V or after the MR input is deasserted - ensuring sufficient time for µP and peripheral initialization before firmware 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 draw only 5µA and maintains valid RESET output behavior down to VCC = 1.0V. Below 1.0V, RESET becomes high-impedance - a known limitation documented in the datasheet.
Is an external pullup resistor required for the RESET pin of MAX6314US28D4+T?
No external pullup resistor is required for the RESET pin of MAX6314US28D4+T. The device integrates a 4.7kΩ passive pullup resistor and a p-channel active pullup transistor, enabling direct interface with bidirectional µP reset pins. Adding an external pullup would conflict with this internal structure and is explicitly discouraged in the datasheet.
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:
- 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:
- 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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