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Analog Devices Inc./Maxim Integrated MAX6385XS38D1-T
- Part No.:
- MAX6385XS38D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS38D1-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,362
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Product details
Overview
MAX6385XS38D1-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.80V reset threshold, 1ms minimum reset timeout, manual reset input (MR), and 4-pin SC70 package. It monitors VCC from +1.8V to +5.0V, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in battery-powered controllers for reliable power-up sequencing.
For engineers reviewing the MAX6385XS38D1-T datasheet, MAX6385XS38D1-T pinout, MAX6385XS38D1-T application, or MAX6385XS38D1-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), MR input pulse width (≥1µs), VCC-to-reset delay (35µs), open-drain vs. push-pull output compatibility, and SC70 footprint constraints.
Technical Context
The MAX6385XS38D1-T implements a precision voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco, paired with a monolithic timer generating a guaranteed-minimum 1ms reset assertion after VCC recovery. Its MR input features a 63kΩ internal pullup and supports TTL/CMOS logic levels.
Unlike dual-monitor variants (e.g., MAX6387–MAX6389), this device lacks RESET IN functionality and instead focuses on single-supply monitoring with active-high push-pull output - ensuring immediate high-Z release and fast rise time without external pullups. Reset state validity is maintained down to VCC = 1V, enabling robust brownout detection in low-voltage embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.80V nominal (±2.5% over –40°C to +125°C); ensures reliable detection of 3.3V rail brownout before system instability. |
| Reset Timeout | 1ms minimum; provides sufficient hold time for microcontroller core initialization after power stabilization. |
| Supply Current | 3μA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors. |
| Output Type | Active-high push-pull; eliminates need for external pullup resistor and reduces BOM count. |
| MR Input | Debounced manual reset with 63kΩ internal pullup; supports direct switch-to-GND connection without external RC network. |
| VCC Range | +1.0V to +5.5V; supports operation during deep brownout and compatibility with 1.2V–5V logic domains. |
| Operating Temp | –40°C to +125°C; qualified for industrial and automotive under-hood applications. |
Pinout & Package
MAX6385XS38D1-T uses a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187) with 0.65mm pitch and thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage source; must be decoupled with 0.1µF capacitor near pin for transient immunity. |
| 2 | RESET | Active-high push-pull output; drives high during reset assertion and releases to high-impedance when deasserted. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; requires <1µs pulse width for reliable reset initiation. |
| 4 | GND | Analog and digital ground reference; must be connected to low-impedance system ground plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.80V with ±2.5% tolerance over full temperature range - eliminates need for external resistor divider calibration. |
| Ultra-low quiescent current | 3μA at +1.8V - extends battery life in portable medical devices and wireless sensor nodes. |
| Guaranteed reset validity | Operates correctly down to VCC = 1V - ensures deterministic reset behavior during severe brownout conditions. |
| MR input with integrated pullup | 63kΩ internal resistor - enables direct momentary switch interface without discrete components. |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in electrically noisy environments. |
Applications
| Power-Up Sequencing in Industrial PLCs | Battery Voltage Monitoring in Wearables |
|---|---|
Use Scenario: Ensuring deterministic startup of ARM Cortex-M4-based programmable logic controllers after cold power application. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET until 3.3V rail stabilizes above 3.80V and holds for ≥1ms. Use Value: Prevents firmware execution errors caused by marginal VDD during ramp-up; eliminates need for external timing capacitor. | Use Scenario: Monitoring coin-cell voltage in Bluetooth LE fitness trackers to trigger graceful shutdown before deep discharge. IC Role / Device Role / Timing Role: Single-supply monitor detecting drop below 3.80V on 3.0V system rail, asserting RESET to halt MCU operation. Use Value: Achieves 3μA supply current - adds <1% daily drain to CR2032 cell; enables >2-year shelf life. |
| Manual Reset in Test Equipment | Low-Voltage Brownout Protection in Automotive ECUs |
Use Scenario: Providing field-serviceable reset capability in handheld oscilloscope calibrators using tactile button. IC Role / Device Role / Timing Role: MR input accepts direct switch closure to GND; internal 63kΩ pullup ensures clean logic transition without bounce filtering. Use Value: Eliminates debounce circuitry - reduces PCB area by 2.5mm² and component count by 3 parts per unit. | Use Scenario: Protecting CAN controller firmware during engine cranking-induced 12V battery sag in body control modules. IC Role / Device Role / Timing Role: Monitoring 3.3V LDO output derived from vehicle battery; asserts RESET if voltage falls below 3.80V for >1ms. Use Value: ±2.5% threshold accuracy over –40°C to +125°C ensures consistent trip point across extreme ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR38D1+T | Same 3.80V threshold and 1ms timeout, but active-low push-pull output; no MR input. | Suitable where host MCU requires active-low reset signal and manual reset is unnecessary. | Select when system design mandates active-low assertion and board layout cannot accommodate MR trace routing. |
| TPS3808G33DBVR | 3.3V threshold (not 3.80V); 20ms min timeout; 1.8–6V VCC range; includes watchdog timer. | Applicable where 3.3V rail supervision is required and extended timeout supports complex bootloaders. | Choose when higher VCC range tolerance or integrated watchdog functionality is needed, accepting different threshold and timing. |
Compared with MAX6385XS38D1-T, MAX6326XR38D1+T offers identical threshold and timing but lacks MR and uses active-low signaling - requiring level-shifting or MCU pin reassignment. TPS3808G33DBVR provides watchdog capability and wider VCC range but targets 3.3V rails, making it unsuitable for precise 3.80V brownout detection.
Availability
MAX6385XS38D1-T is available at Aetrix Electronics and suitable for industrial PLCs, wearable medical sensors, handheld test equipment, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6385XS38D1-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 and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers single/dual-supply microprocessor supervisory circuits optimized for ultra-low current consumption, tight threshold accuracy, and compact SC70/μDFN packaging - targeting space-constrained, battery-sensitive embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6385XS38D1-T?
The MAX6385XS38D1-T has a factory-set nominal reset threshold of 3.80V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "38" corresponds to VTH(nom) = 3.80V, VTH(min) = 3.71V, and VTH(max) = 3.90V.
Does MAX6385XS38D1-T support manual reset functionality?
Yes, MAX6385XS38D1-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an active-high reset assertion for the full 1ms timeout period after release. The MR pin accepts TTL/CMOS logic levels and requires a minimum pulse width of 1µs for reliable triggering.
What package type and pin count does MAX6385XS38D1-T use?
MAX6385XS38D1-T is packaged in a lead-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098). Pin configuration is: Pin 1 = VCC, Pin 2 = RESET (active-high push-pull), Pin 3 = MR (active-low manual reset), Pin 4 = GND. Land pattern number is 90-0187.
Can MAX6385XS38D1-T operate reliably at VCC = 1.2V?
Yes, MAX6385XS38D1-T guarantees correct reset output logic state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.2V, the device remains fully functional - monitoring the supply, asserting RESET when below 3.80V (though physical trip is impossible below VCC), and maintaining valid output drive capability.
Is MAX6385XS38D1-T pin-compatible with older Maxim reset ICs like MAX809?
No, MAX6385XS38D1-T is not pin-compatible with MAX809. While the datasheet states pin compatibility with MAX809/MAX810/MAX803 *within the same package variant*, MAX6385XS38D1-T uses a 4-pin SC70 package, whereas MAX809 is offered in 3-pin SOT23. The pin assignments differ: MAX6385XS38D1-T allocates Pin 3 to MR, which MAX809 lacks entirely.
MAX6385XS38D1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS38D1-T FAQ
1.How can I place an order for MAX6385XS38D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS38D1-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 MAX6385XS38D1-T reliable?
The price and inventory of MAX6385XS38D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS38D1-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS38D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS38D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS38D1-T?
MAX6385XS38D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS38D1-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 MAX6385XS38D1-T?
For technical support, including MAX6385XS38D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS38D1-T requirements.
6.How does Aetrix verify that MAX6385XS38D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS38D1-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 MAX6385XS38D1-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS38D1-T?
All MAX6385XS38D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS38D1-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 MAX6385XS38D1-T part is unused and in its original packaging.
Return procedure for MAX6385XS38D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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