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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:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,252
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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 bidirectional reset I/Os (e.g., Motorola 68HC11). It features a factory-trimmed reset threshold of 3.08V, minimum reset timeout period of 1120ms, ±2.5% threshold accuracy over temperature, 5µA supply current, and SOT143 package. It is used in portable/battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6314US31D4 datasheet, MAX6314US31D4 pinout, MAX6314US31D4 application, or MAX6314US31D4 equivalent, key selection criteria include its 3.08V reset threshold, 1120ms minimum timeout, bidirectional RESET output architecture with integrated 4.7kΩ pullup + active P-channel pullup, immunity to short VCC transients, and compatibility with systems requiring manual reset debouncing without external components.
Technical Context
The MAX6314US31D4 implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 3.08V reset threshold, coupled with an internal timer that enforces a minimum 1120ms reset assertion after VCC recovery or MR 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 below 0.5V - enabling fast rise times on capacitive reset buses.
This architecture directly supports bidirectional reset protocols used by the 68HC11: the µP releases RESET after four E-clock cycles, samples it after two more cycles, and distinguishes self-initiated vs. external resets based on logic state - a function enabled only by the MAX6314US31D4's active pullup capability under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 3.3V systems with margin. |
| Reset Timeout Period | 1120ms minimum - guarantees sufficient hold time for full system initialization in slow-start applications. |
| Supply Current | 5µA typical at +25°C - enables multi-year battery life in portable monitoring devices. |
| VCC Operating Range | 1.0V to 5.5V - supports operation down to near-zero VCC for valid reset assertion during deep power-down. |
| MR Input Threshold | 0.3 × VCC low, 0.7 × VCC high - ensures noise-immune manual reset triggering across supply range. |
| RESET Output Structure | N-channel pulldown + 4.7kΩ pullup + P-channel active pullup - eliminates need for external pullup and enables <500ns rise time on 390pF bus. |
| MR Glitch Rejection | 100ns - suppresses EMI-induced false resets on manual reset line. |
Pinout & Package
SOT143 package: 4-pin, surface-mount, 1.3mm × 2.9mm footprint, -40°C to +85°C operating range, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input and reset threshold monitor | Primary power rail connection; internal voltage divider references this node to generate 3.08V threshold. |
| MR | Manual reset input | Active-low input with 63kΩ internal pullup; asserts reset when pulled ≤0.3×VCC and holds reset for full 1120ms timeout after release. |
| RESET | Bidirectional reset output | Open-drain–compatible output with integrated 4.7kΩ pullup and 2µs active P-channel pullup - enables direct interface to 68HC11-style bidirectional reset I/Os. |
| GND | Ground reference | Return path for all internal circuitry and reset comparator; must be low-impedance for accurate threshold sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional RESET output | Integrates 4.7kΩ pullup + P-channel active pullup to meet 68HC11 timing requirements (<500ns rise on 390pF), eliminating external components and ensuring correct reset source identification. |
| Factory-trimmed 3.08V threshold | Laser-trimmed internal resistor network achieves ±2.5% accuracy over temperature - matches 3.3V system rails with guaranteed 220mV hysteresis margin. |
| 1120ms minimum reset timeout | Internally programmed one-shot timer ensures reset remains asserted long enough for FPGA configuration, EEPROM write completion, or slow-crystal startup in embedded controllers. |
| 5µA quiescent current | Ultra-low ICC enables use in always-on battery-backed instrumentation where standby current directly impacts service life. |
| Immunity to short VCC transients | Rejects glitches ≤100ns duration at 3.08V–VCC overdrive ≥20mV - prevents spurious resets in electrically noisy industrial environments. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter requires guaranteed reset during cold-start and brownout while minimizing standby drain. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET until VCC stabilizes above 3.08V and holds it for ≥1120ms to allow ADC calibration and display initialization. Use Value: 5µA supply current extends single-CR2032 battery life beyond 5 years in sleep mode; 3.08V threshold aligns precisely with 3.3V LDO dropout voltage. | Use Scenario: DIN-rail mounted PLC module operates in 24V DC field environments with frequent power interruptions and conducted noise. IC Role / Device Role / Timing Role: Voltage supervisor detecting undervoltage on 3.3V logic rail and generating clean, glitch-immune reset pulse to ARM Cortex-M7 MCU. Use Value: 100ns MR glitch rejection and 1120ms timeout prevent spurious reboots during transient dips; bidirectional RESET supports firmware-triggered diagnostics reset. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: ANSI C12.22-compliant meter must retain RTC state during brief AC loss and perform secure boot on recovery. IC Role / Device Role / Timing Role: Power monitor asserting RESET only when VCC falls below 3.08V, then holding for 1120ms to ensure secure bootloader execution before application code launch. Use Value: Factory-trimmed threshold eliminates calibration step; 1120ms timeout exceeds max EEPROM write cycle time (100ms) with 10× safety margin. | Use Scenario: BCM powered from vehicle battery experiences load-dump and cold-crank transients; must avoid unintended reset during cranking (VCC dip to 2.5V). IC Role / Device Role / Timing Role: Supervisor monitoring 3.3V domain, asserting RESET only when VCC drops below 3.08V and sustaining it through cranking recovery phase. Use Value: ±2.5% threshold accuracy over temperature ensures consistent trip point from –40°C engine bay to +85°C cabin; 1120ms timeout covers worst-case CAN bus reinitialization. |
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); identical 3.08V threshold and 1120ms timeout. | Requires external 4.7kΩ pullup; not suitable for bidirectional reset protocols like 68HC11. | Select only if target µP uses standard open-drain reset input and board layout already includes pullup. |
| TPS3808G31DBVR | 3.08V threshold, 1200ms timeout, 1.6µA IQ, but push-pull RESET (not bidirectional); no MR glitch rejection spec. | Lacks active pullup and MR debounce; incompatible with 68HC11-style reset arbitration. | Prefer for ultra-low-power applications where bidirectional reset is unnecessary and push-pull drive is acceptable. |
Compared with MAX6315US31D4 and TPS3808G31DBVR, the MAX6314US31D4 uniquely delivers bidirectional RESET with integrated active pullup - essential for systems requiring reset source discrimination - while maintaining identical 3.08V/1120ms specifications and 5µA supply current.
Availability
MAX6314US31D4 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed reset reliability under voltage transients.
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) designs precision analog, mixed-signal, and power management ICs for industrial, computing, communications, and consumer applications.
The MAX6314 family delivers highly accurate, low-power µP supervisory circuits optimized for systems requiring bidirectional reset compatibility, factory-trimmed thresholds, and robust transient immunity - especially in battery-powered and harsh-environment embedded control.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6314US31D4?
The MAX6314US31D4 has a factory-trimmed nominal reset threshold of 3.08V, with ±2.5% accuracy over the full operating temperature range of –40°C to +85°C. This specification is verified per the Electrical Characteristics table in the official Maxim datasheet, and the 3.08V value corresponds to the "US31" suffix in the part number. The MAX6314US31D4 maintains this accuracy without external calibration or trimming components.
Does MAX6314US31D4 support bidirectional reset communication with the Motorola 68HC11?
Yes, the MAX6314US31D4 is explicitly designed for bidirectional reset compatibility with the Motorola 68HC11 and other µPs featuring bidirectional reset I/Os. Its RESET pin integrates both an N-channel pulldown and a P-channel active pullup (enabled for 2µs), allowing the µP to pull the line low and the supervisor to actively drive it high - satisfying the precise timing and voltage transition requirements defined in the 68HC11 reset protocol.
What is the minimum reset timeout period specified for MAX6314US31D4?
The MAX6314US31D4 provides a minimum reset timeout period of 1120ms, as indicated by the "D4" suffix in the part number. This value is guaranteed across temperature and supply voltage variations, and is internally programmed - no external capacitor or resistor is required to set or adjust the timeout. The 1120ms duration ensures reliable system initialization in applications such as FPGA configuration or secure bootloader execution.
Can MAX6314US31D4 operate with VCC as low as 1.0V, and what happens to RESET below that?
Yes, the MAX6314US31D4 operates with VCC down to 1.0V, and RESET is guaranteed to remain a valid logic low (≤0.4V) for VCC > 1.0V. When VCC falls below 1.0V, the internal circuitry disables the RESET pulldown, causing RESET to become a high-impedance open circuit. In applications requiring a defined logic state down to 0V, a 100kΩ external pull-down resistor on RESET is recommended - a design detail confirmed in the MAX6314US31D4 datasheet's Applications Information section.
Is there an internal pullup on the MR pin of MAX6314US31D4, and what is its value?
Yes, the MAX6314US31D4 includes a 63kΩ internal pullup resistor on the MR pin, as documented in the Pin Description and Electrical Characteristics tables. This allows MR to be left unconnected (open) when unused, simplifying PCB layout. For manual reset functionality, a normally open momentary switch from MR to GND is sufficient - no external pullup or debounce circuitry is required, though a 0.1µF capacitor to ground is recommended in noisy environments.
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:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- 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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