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Analog Devices Inc./Maxim Integrated MAX6314US44D4+T
- Part No.:
- MAX6314US44D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6314US44D4+T.pdf
- Description:
- IC RESET CIRCUIT 4.39V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,639
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Product details
Overview
MAX6314US44D4+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 bidirectional reset I/Os (e.g., 68HC11). It features a factory-trimmed 4.39V reset threshold, 1120ms minimum reset timeout period, ±1.8% threshold accuracy at +25°C, and operates from 2.5V to 5.5V. It is used in portable/battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6314US44D4+T datasheet, MAX6314US44D4+T pinout, MAX6314US44D4+T application, or MAX6314US44D4+T equivalent, key selection criteria include bidirectional RESET compatibility, 4.39V VTH tolerance over temperature, 1120ms timeout stability, SOT143 footprint constraints, and manual reset (MR) debounce capability without external components.
Technical Context
The MAX6314US44D4+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 4.39V reset threshold, and an internal timer that guarantees RESET remains asserted for ≥1120ms after VCC rises above threshold or MR deasserts. Its bidirectional RESET output combines a 4.7kΩ pull-up resistor with a P-channel active pull-up transistor to ensure fast rise time (<35µs typical) under capacitive load-critical for multi-device reset buses.
It integrates a 63kΩ internal pull-up on MR, enabling direct connection of a momentary switch to GND without external components, and includes glitch rejection (100ns minimum MR pulse width) and immunity to short VCC transients (e.g., <10µs at 100mV overdrive). The device draws only 5µA typical supply current at +25°C and functions across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTH Nominal | 4.39V - Factory-trimmed threshold ensures precise brownout detection at system VCC rail |
| tRP Min | 1120ms - Guarantees sufficient reset hold time for full µP initialization and memory stabilization |
| VTH Accuracy | ±1.8% at +25°C - Enables tight margining for 3.3V/5V systems without calibration |
| ICC Typ | 5µA - Supports ultra-low-power operation in battery-backed or energy-harvested systems |
| Package | SOT143 - 4-pin surface-mount package with 1.3mm × 2.9mm footprint, compatible with high-density PCB layouts |
| RESET Type | Bidirectional with active pull-up - Directly interfaces 68HC11-style µPs; eliminates need for external pull-up or level-shifting |
| MR Input | Internal 63kΩ pull-up - Allows single-pole momentary switch to GND; no external R required |
Pinout & Package
SOT143 package: 4-pin, surface-mount, lead-free (RoHS-compliant), -40°C to +85°C operating range. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage and reset threshold monitor input | Primary power rail input; internally divided to generate 4.39V reference for reset assertion |
| MR | Manual reset input | Active-low input with 63kΩ internal pull-up; asserts reset when pulled low, holds reset for full 1120ms timeout |
| RESET | Active-low bidirectional reset output | Combines 4.7kΩ passive pull-up + P-channel active pull-up; sinks current and sources current to interface bidirectional µP reset pins |
| GND | Ground reference | Common return path for VCC, MR, and RESET; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional RESET output | Enables direct connection to 68HC11 and similar µPs without external logic or level shifters-reduces BOM count and layout complexity |
| Factory-trimmed 4.39V threshold | Eliminates need for external resistor dividers or trimming; ensures consistent reset point across production lots and temperature |
| 1120ms minimum timeout | Guarantees µP and peripheral initialization completes before release; prevents premature code execution during power ramp |
| 5µA supply current | Extends battery life in portable instruments and remote sensors where standby current directly impacts operational lifetime |
| MR debounce via internal design | Supports mechanical switch inputs without RC filters or firmware debouncing-simplifies hardware and reduces µP resource usage |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter requiring guaranteed reset during cold-start and brownout recovery. IC Role / Device Role / Timing Role: Supervisory IC asserting bidirectional RESET to ARM Cortex-M0 µP upon VCC drop below 4.39V or user-initiated MR press. Use Value: 1120ms timeout ensures flash programming and ADC calibration complete before application code resumes; 5µA ICC extends 2xAA battery life beyond 12 months in sleep mode. | Use Scenario: DIN-rail mounted I/O module exposed to 24VDC supply fluctuations in factory automation environments. IC Role / Device Role / Timing Role: Voltage supervisor monitoring 3.3V logic rail derived from switching regulator; asserts RESET during line sags or hot-swap events. Use Value: ±2.5% VTH accuracy over –40°C to +85°C maintains reliable trip point despite ambient thermal cycling; MR allows field-service reset without power cycle. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Low-voltage subsystem (e.g., door module) powered from vehicle battery with transient-heavy 12V supply. IC Role / Device Role / Timing Role: Reset generator interfacing bidirectional reset pin of Infineon XC2200 µC; monitors 5V regulated rail. Use Value: Immunity to <10µs VCC glitches prevents spurious resets during load-dump or ignition noise; SOT143 footprint fits constrained space behind dashboard bezel. | Use Scenario: Revenue-grade electricity meter with tamper detection and real-time clock backup requiring deterministic power-fail response. IC Role / Device Role / Timing Role: Supervisor for MSP430FR59xx µC, asserting RESET when main 3.3V rail falls below 4.39V (indicating AC loss or DC-DC fault). Use Value: Active pull-up ensures RESET rises within two E-clock cycles even with 200pF bus capacitance-enabling correct reset source identification (external vs. watchdog) per TI/MSP430 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US44D4+T | Open-drain RESET output (no active pull-up); same VTH (4.39V), tRP (1120ms), and SOT143 package | Requires external pull-up resistor; incompatible with bidirectional µP reset pins like 68HC11 | Select only if target µP uses open-drain reset input and board layout already includes 4.7kΩ pull-up |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; push-pull RESET; 200ms timeout; SOT-23-5 package | Not pin-compatible; lacks MR input; different VTH and timeout prevent direct substitution in 4.39V/1120ms designs | Consider only for new designs targeting 3.3V systems with push-pull reset requirements and no MR need |
Compared with MAX6315US44D4+T and TPS3808G33DBVR, the MAX6314US44D4+T uniquely delivers bidirectional RESET with integrated active pull-up-essential for legacy µPs like 68HC11-and matches the exact 4.39V/1120ms specification required in existing industrial and portable designs.
Availability
MAX6314US44D4+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6314US44D4+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 analog and mixed-signal ICs for power, interface, sensing, and timing applications.
The MAX6314 series was designed specifically for microprocessor supervision in space-constrained, low-power systems-emphasizing factory-trimmed accuracy, bidirectional reset compatibility, and minimal external component count.
FAQ
What is the exact reset threshold voltage for MAX6314US44D4+T?
The MAX6314US44D4+T has a factory-trimmed nominal reset threshold voltage of 4.39V, with ±1.8% accuracy at +25°C and ±2.5% 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 of the datasheet.
Does MAX6314US44D4+T require an external pull-up resistor on the RESET pin?
No, the MAX6314US44D4+T does not require an external pull-up resistor on the RESET pin. It integrates a 4.7kΩ pull-up resistor in parallel with a P-channel active pull-up transistor, enabling direct interface to bidirectional µP reset inputs such as those found on the 68HC11. This eliminates external components and ensures fast rise time under capacitive load.
What is the minimum reset timeout period for MAX6314US44D4+T?
The minimum reset timeout period for MAX6314US44D4+T is 1120ms. This is the guaranteed minimum duration that the RESET output remains asserted after VCC rises above the 4.39V threshold or after the manual reset (MR) input is deasserted. The actual timeout may be longer due to process and temperature variation but will never fall below this value.
Can MAX6314US44D4+T be used with microcontrollers that have open-drain reset inputs?
Yes, the MAX6314US44D4+T can be used with microcontrollers having open-drain reset inputs, but it is suboptimal. Its bidirectional RESET output includes an active pull-up, which is unnecessary-and potentially problematic-in open-drain configurations. For such cases, the pin-compatible MAX6315US44D4+T (open-drain only) is the recommended alternative.
Is the manual reset (MR) input of MAX6314US44D4+T debounced internally?
Yes, the MR input of MAX6314US44D4+T is internally debounced. It features a 100ns minimum pulse-width rejection and integrates a 63kΩ internal pull-up resistor, allowing direct connection of a momentary switch to GND without external RC networks or firmware debouncing routines. This simplifies hardware design and improves reliability in noisy environments.
MAX6314US44D4+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:
- 4.39V
- 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
MAX6314US44D4+T FAQ
1.How can I place an order for MAX6314US44D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6314US44D4+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 MAX6314US44D4+T reliable?
The price and inventory of MAX6314US44D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6314US44D4+T is usually 5 days.
3.What payment methods are accepted for MAX6314US44D4+T?
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4.How is shipping managed for MAX6314US44D4+T?
MAX6314US44D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6314US44D4+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 MAX6314US44D4+T?
For technical support, including MAX6314US44D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6314US44D4+T requirements.
6.How does Aetrix verify that MAX6314US44D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6314US44D4+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 MAX6314US44D4+T meets industry standards.
7.What is the process for return or replacement of MAX6314US44D4+T?
All MAX6314US44D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6314US44D4+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 MAX6314US44D4+T part is unused and in its original packaging.
Return procedure for MAX6314US44D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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