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Analog Devices Inc./Maxim Integrated MAX6385XS40D7-T
- Part No.:
- MAX6385XS40D7-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS40D7-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,535
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Product details
Overview
MAX6385XS40D7-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.00V reset threshold, 1200ms VCC reset timeout, and manual reset input. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for use in industrial power-up sequencing and brownout protection.
For engineers reviewing the MAX6385XS40D7-T datasheet, MAX6385XS40D7-T pinout, MAX6385XS40D7-T application, or MAX6385XS40D7-T equivalent, this page delivers verified electrical parameters, SC70-4 package layout, reset timing behavior, MR debounce capability, and direct alternatives for voltage-monitoring system design.
Technical Context
The MAX6385XS40D7-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy over temperature and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 1200ms reset assertion after VCC rises above 4.00V, while the debounced manual reset input (MR) triggers a separate 150ms reset pulse when pulled low.
This device uses BiCMOS process technology and features an internal 63kΩ pullup on MR, push-pull active-high RESET output capable of sourcing 800µA at VCC ≥ 4.5V, and immunity to negative-going VCC transients up to 150µs at 100mV overdrive - all within a 4-pin SC70 package rated for automotive-grade operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V (factory-set, ±2.5% over –40°C to +125°C) |
| VCC Reset Timeout | 1200ms minimum - ensures μP remains held in reset long enough for stable power rail settling |
| Manual Reset Timeout | 150ms minimum - provides short, controlled reset pulse independent of VCC behavior |
| Supply Current | 3μA at +1.8V - enables battery-backed or ultra-low-power monitoring without significant drain |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout conditions |
| Output Type | Push-pull active-high - eliminates need for external pullup resistor and drives high-impedance loads directly |
| MR Input Pullup | 63kΩ internal - allows direct connection of momentary switch to GND without external components |
Pinout & Package
MAX6385XS40D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, with thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - powers internal circuitry and serves as reset trigger source |
| 2 | RESET | Active-high push-pull output - asserts high during reset condition; sinks current when deasserted, sources current when asserted |
| 3 | MR | Active-low manual reset input - logic low forces reset; internal 63kΩ pullup to VCC enables switch-to-GND interface |
| 4 | GND | Ground reference for all internal comparators, timers, and output drivers - must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.00V reset threshold | Eliminates external resistor divider and calibration effort for +5V system monitoring |
| 1200ms VCC reset timeout | Meets JEDEC JESD8-12B hold-time requirements for 32-bit microcontrollers during cold start |
| Debounced manual reset input | Rejects >100ns noise pulses and enables direct PCB-mount pushbutton integration without RC filtering |
| Valid reset output down to VCC = 1V | Ensures deterministic μP initialization even during rapid power collapse or backup battery switchover |
| –40°C to +125°C operating range | Qualified for under-hood automotive, industrial PLC, and outdoor embedded applications without derating |
Applications
| Industrial PLC Power Sequencing | Automotive Body Control Module |
|---|---|
|
Use Scenario: Coordinating startup of multiple voltage rails (3.3V I/O, 1.2V core) in programmable logic controllers. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting active-high RESET to ARM Cortex-M7 until all rails stabilize above 4.00V for ≥1200ms. Use Value: Prevents firmware execution errors caused by premature release of reset during multi-rail power-up ramp. |
Use Scenario: Ensuring safe boot of BCM microcontroller after vehicle battery reconnection or jump-start. IC Role / Device Role / Timing Role: Monitoring 5V supply rail and generating 1200ms reset pulse; MR pin accepts ignition-switch signal for forced reset on key cycle. Use Value: Guarantees full register initialization before CAN bus initialization, avoiding bus arbitration faults. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU Supervision |
|
Use Scenario: Maintaining fail-safe state during AC/DC adapter dropout or battery transition in Class II medical devices. IC Role / Device Role / Timing Role: Active-high RESET output holds PIC32MX in reset during brownout; MR enables nurse-initiated soft reset via front-panel button. Use Value: Meets IEC 62304 §5.5.2 requirement for deterministic restart after power anomaly without EEPROM corruption. |
Use Scenario: Securing metering SoC (e.g., STPM3x + ARM Cortex-M0) against undervoltage-induced flash write corruption during grid sags. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output; 4.00V threshold detects upstream 5V rail collapse; 1200ms timeout exceeds max EEPROM write cycle time. Use Value: Prevents partial configuration writes during voltage dip, preserving metrology accuracy and regulatory compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS40D4-T | Same 4.00V threshold and MR function, but 1120ms VCC reset timeout (vs. 1200ms) | Suitable where slightly shorter reset hold time is acceptable, e.g., faster-boot consumer devices | Select when 1120ms meets system timing margin and cost optimization is prioritized |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, open-drain output, no MR input | Lacks manual reset and longer timeout; requires external pullup; not drop-in compatible | Choose only if 3.3V monitoring suffices and board layout allows redesign for open-drain drive |
Compared with MAX6385XS40D7-T, MAX6385XS40D4-T offers identical functionality with reduced timeout duration, while TPS3808G33DBVR provides lower-cost supervision at a different voltage point but sacrifices MR capability and requires interface redesign.
Availability
MAX6385XS40D7-T is available at Aetrix Electronics and suitable for industrial PLC power sequencing, automotive body control modules, medical infusion pump controllers, and smart energy meter MCU supervision requiring stable component supply across extended temperature ranges.
Supply support for MAX6385XS40D7-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 demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability performance.
The MAX6381–MAX6390 family delivers single/dual-voltage microprocessor supervisory circuits optimized for ultra-low quiescent current, wide temperature operation, and robust transient immunity in space-constrained systems.
FAQ
What is the exact reset threshold voltage of the MAX6385XS40D7-T?
The MAX6385XS40D7-T has a factory-set reset threshold of 4.00V, specified with ±2.5% tolerance over the full –40°C to +125°C temperature range. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "40"), and applies to the VCC supply rail monitored by the device. The MAX6385XS40D7-T does not monitor auxiliary voltages - it is a single-supply supervisor.
Does the MAX6385XS40D7-T support manual reset, and how is it implemented?
Yes, the MAX6385XS40D7-T includes a debounced manual reset input (MR) on Pin 3. Driving MR low forces an active reset; the device then holds RESET high for a guaranteed minimum 150ms after MR is released. An internal 63kΩ pullup resistor connects MR to VCC, enabling direct connection of a momentary switch to ground without external components. This functionality is explicitly documented for MAX6385 in the Selector Guide and Pin Description sections.
What package type and dimensions does the MAX6385XS40D7-T use?
The MAX6385XS40D7-T is packaged in a lead-free, RoHS-compliant 4-pin SC70 (SOT-323) outline, with package code X4+1, outline number 21-0098, and land pattern 90-0187. Its footprint measures 2.0mm × 2.1mm, height is 0.95mm maximum, and thermal resistance is θJA = 322.6°C/W on a multilayer PCB - all confirmed in the official Package Information section.
How does the MAX6385XS40D7-T behave during brownout conditions below 1.8V?
The MAX6385XS40D7-T guarantees correct reset output logic state down to VCC = 1.0V, per Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.0V, it continues asserting RESET high while consuming <6μA, ensuring μP remains held until full power recovery. Below 1.0V, operation is not specified - external pulldown resistors are recommended only for push-pull active-low variants, not applicable to this active-high device.
Is the MAX6385XS40D7-T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, the MAX6385XS40D7-T is explicitly listed as pin-compatible with MAX809/MAX810/MAX803 and other members of the MAX63xx family in the Features section. All share identical 4-pin SC70 pinout (VCC, RESET, MR, GND), same reset output drive strength, and compatible voltage thresholds - enabling direct replacement in existing designs without PCB modification.
MAX6385XS40D7-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:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS40D7-T FAQ
1.How can I place an order for MAX6385XS40D7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS40D7-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 MAX6385XS40D7-T reliable?
The price and inventory of MAX6385XS40D7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS40D7-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS40D7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS40D7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS40D7-T?
MAX6385XS40D7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS40D7-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 MAX6385XS40D7-T?
For technical support, including MAX6385XS40D7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS40D7-T requirements.
6.How does Aetrix verify that MAX6385XS40D7-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS40D7-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 MAX6385XS40D7-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS40D7-T?
All MAX6385XS40D7-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS40D7-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 MAX6385XS40D7-T part is unused and in its original packaging.
Return procedure for MAX6385XS40D7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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