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Analog Devices Inc./Maxim Integrated MAX6394US300D2+T
- Part No.:
- MAX6394US300D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6394US300D2+T.pdf
- Description:
- IC MPU/RESET CIRC 3.0V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
MAX6394US300D2+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 3.003V or upon manual reset assertion. It features ±1.0% threshold accuracy over −40°C to +125°C, 14ms minimum reset timeout, 5µA typical supply current at +25°C, and SOT143-4 packaging. It is used in battery-powered controllers and critical μP power monitoring systems.
For engineers reviewing the MAX6394US300D2+T datasheet, MAX6394US300D2+T pinout, MAX6394US300D2+T application, or MAX6394US300D2+T equivalent, key selection criteria include factory-trimmed 3.003V reset threshold, 14ms timeout option (D2), open-drain output capable of level-shifting above VCC, AEC-Q100 qualification for automotive-grade reliability, and immunity to sub-100ns MR glitches.
Technical Context
The MAX6394US300D2+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 3.003V nominal reset threshold. Its internal timer generates a fixed 14ms minimum reset timeout after VCC recovery or MR deassertion, with guaranteed timing stability across temperature.
This device 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 in multi-rail systems. The MR input includes a 63kΩ internal pullup and 100ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.003V nominal, ±1.0% over −40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 14ms minimum (D2 option) - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 5µA typical at +25°C - enables ultra-low-power operation in portable/battery-powered equipment |
| Output Type | Active-low open-drain RESET - allows flexible pullup to voltages up to 6V, independent of VCC |
| MR Input Logic | Logic-low assertion with 100ns glitch rejection and internal 63kΩ pullup - eliminates need for external debounce components |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev G - meets automotive reliability and stress-test requirements |
Pinout & Package
The MAX6394US300D2+T is housed in a 4-pin SOT143-4 package (package code U4+1), with 1.3mm × 1.3mm footprint and 0.95mm height, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal circuitry and RESET sink current; must be connected to system ground plane |
| 2 (RESET) | Active-low open-drain output | Sinks current when asserted; requires external pullup resistor (e.g., 10kΩ) to logic-high voltage ≤6V |
| 3 (MR) | Manual reset input | Logic-low active; internally pulled up to VCC via 63kΩ; debounced by 100ns filter |
| 4 (VCC) | Supply and monitor input | Power source and monitored rail; voltage range 1.0V–5.5V; internal divider sets 3.003V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed threshold | 3.003V ±1.0% over full temperature range - eliminates calibration and external resistor networks |
| Four selectable timeout options | D2 variant provides 14ms minimum timeout - balances reset hold time and fast system recovery |
| Open-drain RESET with >VCC capability | Supports pullup to 6V - enables reset signaling across isolated or higher-voltage domains |
| Immunity to short VCC transients | Rejects <100ns glitches - prevents spurious resets during EMI or switching noise events |
| Ultra-low quiescent current | 5µA typical at +25°C - extends battery life in always-on portable instrumentation |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Monitoring 3.3V core supply during cold-start and brownout in embedded PC BIOS firmware. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until VCC stabilizes above 3.003V for ≥14ms. Use Value: Prevents CPU lockup or corrupted boot sequence by guaranteeing valid reset pulse duration post-power-up. | Use Scenario: Power supervision in HVAC controller using 3.0V MCU with wide ambient temperature variation. IC Role / Device Role / Timing Role: High-accuracy reset generator with ±1.0% threshold tolerance from −40°C to +125°C. Use Value: Ensures deterministic reset behavior without recalibration across seasonal thermal cycling. |
| Intelligent Instruments | Critical μP and μC Power Monitoring |
Use Scenario: Battery-backed handheld multimeter requiring low-current supervision during sleep mode. IC Role / Device Role / Timing Role: Ultra-low-power (5µA) reset monitor with manual reset via front-panel button. Use Value: Extends shelf life and operational runtime while maintaining field-serviceable reset functionality. | Use Scenario: Safety-critical medical sensor node powered by Li-ion battery with 3.0V regulation. IC Role / Device Role / Timing Role: AEC-Q100-qualified supervisor ensuring fail-safe reset on undervoltage or manual intervention. Use Value: Meets IEC 62304 power integrity requirements for Class B software in medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB30DBZR | 3.0V threshold, 240ms timeout, SOT-23-3 package, no MR input | Lacks manual reset and shorter timeout - unsuitable where operator-initiated reset or fast recovery is required | Select only if MR functionality and 14ms timing are unnecessary and board space permits SOT-23-3 |
| TPS3808G30DBVR | 3.0V threshold, 20ms timeout, SOT-23-6 package, push-pull RESET, higher ICC (12µA) | Push-pull output limits level-shifting capability; higher current draw reduces battery life | Prefer when driving heavy capacitive loads directly but avoid where open-drain flexibility or ultra-low ICC is critical |
Compared with TLV803EB30DBZR and TPS3808G30DBVR, the MAX6394US300D2+T uniquely combines 14ms timeout, manual reset with internal pullup, open-drain level-shifting, and 5µA supply current - making it optimal for compact, battery-sensitive, multi-supply μP systems requiring field serviceability.
Availability
MAX6394US300D2+T is available at Aetrix Electronics and suitable for computers, controllers, and intelligent instruments requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for MAX6394US300D2+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 high-reliability semiconductor solutions for industrial, automotive, and computing markets.
The MAX6394 series belongs to Maxim's high-accuracy μP supervisory product line, engineered specifically for robust power-monitoring in safety-critical and thermally demanding applications where ±1.0% threshold stability and AEC-Q100 compliance are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6394US300D2+T?
The MAX6394US300D2+T has a factory-trimmed nominal reset threshold of 3.003V, with ±1.0% tolerance over the full −40°C to +125°C operating temperature range. This value is confirmed in Tables 1 and 2 of the official datasheet and corresponds to the "300" suffix in the part number.
Does the MAX6394US300D2+T support manual reset functionality?
Yes, the MAX6394US300D2+T includes a dedicated MR (manual reset) input (Pin 3) that asserts RESET when driven logic-low. It features an internal 63kΩ pullup resistor and 100ns glitch rejection, allowing direct connection of a momentary switch to GND without external debounce circuitry.
What is the reset timeout period for the MAX6394US300D2+T?
The MAX6394US300D2+T uses the D2 timeout option, providing a minimum reset timeout period of 14ms after VCC rises above the 3.003V threshold or after MR is deasserted. Typical and maximum values are 28ms and 40ms respectively, as specified in the Electrical Characteristics table.
Can the RESET output of the MAX6394US300D2+T be pulled up to a voltage higher than VCC?
Yes, the MAX6394US300D2+T features an open-drain RESET output rated for voltages up to +6.0V. This allows the output to be pulled up to a supply rail higher than VCC - for example, interfacing a 3.0V-monitored system with a 5V reset controller - enabling level-shifted reset signaling.
Is the MAX6394US300D2+T qualified for automotive applications?
Yes, the MAX6394US300D2+T is AEC-Q100 qualified (Grade 1: −40°C to +125°C), as explicitly stated in the Benefits and Features section and Ordering Information. This qualification confirms its suitability for under-hood and other automotive electronic control units requiring high reliability.
MAX6394US300D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.003V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 14ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6394US300D2+T FAQ
1.How can I place an order for MAX6394US300D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6394US300D2+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 MAX6394US300D2+T reliable?
The price and inventory of MAX6394US300D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6394US300D2+T is usually 5 days.
3.What payment methods are accepted for MAX6394US300D2+T?
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4.How is shipping managed for MAX6394US300D2+T?
MAX6394US300D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6394US300D2+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 MAX6394US300D2+T?
For technical support, including MAX6394US300D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6394US300D2+T requirements.
6.How does Aetrix verify that MAX6394US300D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6394US300D2+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 MAX6394US300D2+T meets industry standards.
7.What is the process for return or replacement of MAX6394US300D2+T?
All MAX6394US300D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6394US300D2+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 MAX6394US300D2+T part is unused and in its original packaging.
Return procedure for MAX6394US300D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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