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Analog Devices Inc./Maxim Integrated MAX6394US480D1+T
- Part No.:
- MAX6394US480D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6394US480D1+T.pdf
- Description:
- IC MPU/RESET CIRC 4.80V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,122
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Product details
Overview
MAX6394US480D1+T from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an active-low open-drain RESET signal when voltage falls below 4.800V or when manual reset (MR) is asserted. It features ±0.6% threshold accuracy at +25°C, 0.7ms minimum reset timeout, 5µA supply current, and operates from -40°C to +125°C. It is used in battery-powered controllers requiring precise brownout detection.
For engineers reviewing the MAX6394US480D1+T datasheet, MAX6394US480D1+T pinout, MAX6394US480D1+T application, or MAX6394US480D1+T equivalent, key selection criteria include factory-trimmed 4.8V reset threshold, SOT143-4 package compatibility, open-drain output capable of level-shifting above VCC, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6394US480D1+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its nominal 4.800V reset threshold. Its reset timeout period is fixed at 0.7ms (min), generated by an internal RC timer independent of external components.
It uses an open-drain n-channel MOSFET for RESET output, enabling pullup to any voltage ≤6V - including supplies higher than VCC - supporting level-shifted reset signaling. MR includes a 63kΩ internal pullup and 100ns glitch rejection, eliminating need for external debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.800V ±0.6% at +25°C; ensures reliable brownout detection at nominal 4.8V rail |
| Reset Timeout Period | 0.7ms (min); guarantees sufficient processor hold time during power recovery |
| Supply Current | 5µA typical at 5.5V; enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | -40°C to +125°C; supports under-hood automotive and industrial embedded environments |
| Output Type | Active-low open-drain; allows flexible pullup to voltages up to 6V, including higher rails |
| MR Input Logic | Logic-low active with 1µs minimum pulse width; compatible with momentary switches and digital logic |
Pinout & Package
The MAX6394US480D1+T is housed in a 4-pin SOT143-4 (also labeled U4+1/U4+1A) surface-mount package, measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal circuitry and MR/RESET bias networks; must be low-impedance |
| RESET (Pin 2) | Active-low open-drain output | Sinks current when asserted; requires external pullup; supports level-shifting up to 6V |
| MR (Pin 3) | Manual reset input | Logic-low assertion triggers reset; internally pulled up to VCC via 63kΩ resistor |
| VCC (Pin 4) | Supply and monitor input | Powers device and provides monitored voltage source for reset comparator |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.8V threshold | Eliminates external resistor network and calibration, reducing BOM count and layout area |
| 0.7ms reset timeout | Guarantees μP initialization stability without requiring external timing capacitor |
| Open-drain RESET with >VCC capability | Enables reset signaling across mixed-voltage domains (e.g., 3.3V logic controlling 5V μP reset) |
| 5µA quiescent current | Extends battery life in portable instrumentation and always-on monitoring systems |
| AEC-Q100 qualified | Validated for automotive applications including engine control modules and ADAS sensor nodes |
Applications
| Industrial Controllers | Automotive Engine Control Units |
|---|---|
Use Scenario: Monitoring 5V supply rails in programmable logic controllers subject to voltage sags during motor switching. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET to halt PLC firmware execution until stable 5V is restored. Use Value: Prevents corrupted state transitions during brownout; 4.800V threshold aligns with 5V system tolerance limits. | Use Scenario: Power sequencing and fault detection in ECU modules operating in under-hood environments (-40°C to +125°C). IC Role / Device Role / Timing Role: High-accuracy reset generator ensuring deterministic boot after cold crank or load dump events. Use Value: ±1.0% threshold accuracy over full temperature range eliminates false resets during thermal cycling. |
| Portable Medical Monitors | Smart Energy Meters |
Use Scenario: Battery-powered vital sign monitors using single-cell Li-ion (4.2V max) with regulated 3.3V rail. IC Role / Device Role / Timing Role: Supervisory circuit detecting end-of-battery discharge before system shutdown. Use Value: 5µA supply current minimizes standby drain; 0.7ms timeout ensures fast recovery on battery recharge. | Use Scenario: Tamper-resistant metering ICs requiring secure power-up initialization and brownout immunity. IC Role / Device Role / Timing Role: Reset supervisor validating main 3.3V supply before enabling metrology ADC and communication interfaces. Use Value: Immunity to <100ns transients prevents spurious resets from EMI-coupled noise on power lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB48DBZR | 4.8V threshold, 35ms timeout, SOT23-3 package, no MR input | Lacks manual reset functionality and offers longer timeout; suited for simpler reset-only use cases | Select when MR is unnecessary and board space permits SOT23-3 footprint |
| ADM6315-48ARTZ-RL | 4.8V threshold, 200ms timeout, SOT23-3, no MR, ±2% accuracy over temperature | Lower accuracy (±2% vs. ±1%) and fixed 200ms timeout limit flexibility in fast-recovery systems | Choose only if cost sensitivity outweighs need for tight threshold tolerance and short timeout |
Compared with TLV803EB48DBZR and ADM6315-48ARTZ-RL, the MAX6394US480D1+T uniquely combines 0.7ms timeout, MR input, ±0.6% room-temp accuracy, and AEC-Q100 qualification - making it optimal for automotive and industrial designs demanding rapid, robust, and configurable reset behavior.
Availability
MAX6394US480D1+T is available at Aetrix Electronics and suitable for industrial controllers, automotive ECUs, and portable medical monitors requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for MAX6394US480D1+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 high-reliability applications.
The MAX6394US480D1+T belongs to Maxim's high-accuracy μP supervisory product line, engineered specifically for deterministic reset generation in automotive, industrial, and battery-critical systems where voltage margin and timing predictability are essential.
FAQ
What is the exact reset threshold voltage of the MAX6394US480D1+T?
The MAX6394US480D1+T has a factory-trimmed nominal reset threshold of 4.800V, with ±0.6% accuracy at +25°C (4.771V to 4.829V) and ±1.0% accuracy from -40°C to +125°C (4.752V to 4.848V). This value is laser-trimmed during production and specified in Tables 1 and 2 of the MAX6394US480D1+T datasheet.
Does the MAX6394US480D1+T require external components to operate?
No, the MAX6394US480D1+T requires no external components for basic operation. Its reset threshold and timeout period are factory-programmed; only an external pullup resistor on the open-drain RESET pin is needed. The MR pin includes a 63kΩ internal pullup, so it may be left floating if unused.
Can the RESET output of the MAX6394US480D1+T be pulled up to a voltage higher than VCC?
Yes, the MAX6394US480D1+T's open-drain RESET output can be pulled up to any voltage between 0V and +6.0V - including supplies higher than VCC. This enables level-shifting functionality, such as using a 5V pullup while monitoring a 3.3V VCC rail, which is explicitly supported per the Absolute Maximum Ratings table.
What is the reset timeout period of the MAX6394US480D1+T?
The MAX6394US480D1+T has a minimum reset timeout period of 0.7ms, with typical and maximum values of 1.4ms and 2.0ms respectively. This fixed timeout is internally generated and does not depend on external capacitors or resistors, ensuring consistent reset assertion duration across temperature and voltage.
Is the MAX6394US480D1+T qualified for automotive applications?
Yes, the MAX6394US480D1+T is AEC-Q100 qualified for automotive applications. It is rated for operation from -40°C to +125°C and meets stress testing requirements for temperature cycling, humidity, and mechanical shock - making it suitable for engine control units, body electronics, and ADAS subsystems.
MAX6394US480D1+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:
- 4.8V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 700µs Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6394US480D1+T FAQ
1.How can I place an order for MAX6394US480D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6394US480D1+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 MAX6394US480D1+T reliable?
The price and inventory of MAX6394US480D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6394US480D1+T is usually 5 days.
3.What payment methods are accepted for MAX6394US480D1+T?
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4.How is shipping managed for MAX6394US480D1+T?
MAX6394US480D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6394US480D1+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 MAX6394US480D1+T?
For technical support, including MAX6394US480D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6394US480D1+T requirements.
6.How does Aetrix verify that MAX6394US480D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6394US480D1+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 MAX6394US480D1+T meets industry standards.
7.What is the process for return or replacement of MAX6394US480D1+T?
All MAX6394US480D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6394US480D1+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 MAX6394US480D1+T part is unused and in its original packaging.
Return procedure for MAX6394US480D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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