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Analog Devices Inc./Maxim Integrated MAX6385XS25D4-T
- Part No.:
- MAX6385XS25D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS25D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,413
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Product details
Overview
MAX6385XS25D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit in 4-pin SC70 package, with factory-set 2.50V reset threshold (±2.5% over -40°C to +125°C), 1120ms minimum VCC reset timeout, and debounced manual reset input. It monitors single supply voltage in battery-powered embedded systems where reliable power-up sequencing and brownout protection are critical.
For engineers reviewing the MAX6385XS25D4-T datasheet, MAX6385XS25D4-T pinout, MAX6385XS25D4-T application, or MAX6385XS25D4-T equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset validity down to VCC = 1V, manual reset pulse handling without external debounce, and compatibility with low-voltage μP I/O domains.
Technical Context
The MAX6385XS25D4-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 1120ms reset assertion after VCC rises above 2.50V, independent of supply ramp rate.
It features an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC, and includes a dedicated MR input with 63kΩ internal pullup resistor-asserting reset on logic-low pulse ≥1µs and rejecting glitches <100ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.50V (nominal), ±2.5% over -40°C to +125°C - ensures deterministic reset activation across automotive and industrial temperature ranges |
| VCC Reset Timeout | 1120ms (min) - holds μP in reset long enough for power rails and clocks to stabilize before code execution |
| Supply Current | 3µA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| MR Input Pullup | 63kΩ - allows direct connection of momentary switch to GND without external components |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct interface to CMOS μP reset inputs |
| Operating Voltage | 1.0V to 5.5V - guarantees valid reset state even during deep brownout conditions down to 1V |
| Reset Propagation Delay | 35µs (VCC falling at 10mV/µs) - provides fast response to rapid supply collapse without false triggering on transients |
Pinout & Package
MAX6385XS25D4-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, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and monitored voltage rail; powers internal circuitry and serves as reference for reset detection |
| 2 | RESET | Active-high push-pull output; drives high during reset assertion and low otherwise - directly compatible with standard μP reset pins |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 63kΩ resistor - enables hardware-initiated reset with no external components |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold sensing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.50V threshold | Eliminates external resistor divider and calibration effort - reduces BOM count and layout area in cost-sensitive applications |
| 1120ms VCC reset timeout | Ensures μP remains held in reset until all peripheral supplies and oscillators achieve stable operation post-power-up |
| Debounced MR input | Rejects mechanical switch bounce and EMI-induced pulses <100ns - removes need for RC filter or firmware debounce logic |
| Valid reset down to VCC = 1V | Guarantees correct logic state on RESET pin during deep brownout, preventing spurious release before full power recovery |
| Negative-going transient immunity | Withstands VCC glitches ≤35µs at 100mV overdrive - avoids false resets in noisy power environments without added bulk capacitance |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable glucose monitor powered by CR2032 coin cell with 1.8V–3.3V operating range and strict low-power requirements. IC Role / Device Role / Timing Role: Supervises main supply rail and asserts active-high RESET to ARM Cortex-M0+ MCU during startup and brownout events. Use Value: 3µA quiescent current extends battery life beyond 5 years; 2.50V threshold aligns precisely with LDO dropout voltage to prevent premature reset release. |
Use Scenario: DIN-rail mounted PLC module with dual 5V/24V supplies, requiring deterministic reset coordination across multiple ASICs. IC Role / Device Role / Timing Role: Monitors 5V logic rail and provides synchronized reset pulse to FPGA configuration controller and communication UART. Use Value: 1120ms timeout exceeds worst-case FPGA configuration time; push-pull output drives multiple loads without signal degradation. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: BCM sub-module operating from 12V battery via 3.3V buck converter, exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V domain and forces MCU reset; MR pin tied to diagnostic test button. Use Value: ±2.5% threshold accuracy over -40°C to +125°C ensures consistent behavior across ambient extremes; MR internal pullup simplifies button interface. |
Use Scenario: ANSI C12.20-certified meter with isolated RS-485 interface and real-time clock, powered from AC line via flyback converter. IC Role / Device Role / Timing Role: Supervises 3.3V RTC and communication IC supply; manual reset used for field firmware recovery. Use Value: 1µs MR pulse width support enables reliable reset initiation from optocoupled diagnostic port; guaranteed reset validity to 1V prevents corruption during AC dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR25D4-T | Same 2.50V threshold and 1120ms timeout, but active-low push-pull output and no MR input | Requires level-shifting or inverted reset logic on host MCU; unsuitable where manual reset is mandatory | Select when legacy board uses active-low reset and manual reset is handled elsewhere |
| TPS3808G33DBVR | 2.93V threshold (not 2.50V), 1200ms timeout, 1.8V–6.5V VCC range, no MR input | Higher threshold may cause premature reset release in 2.5V systems; lacks hardware reset button support | Choose only if system operates near 3.3V and manual reset is implemented externally |
Compared with MAX6385XS25D4-T, MAX6326XR25D4-T saves one pin but requires redesign of reset logic polarity, while TPS3808G33DBVR offers wider VCC range but mismatches the precise 2.50V trip point and omits MR functionality essential for field serviceability.
Availability
MAX6385XS25D4-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6385XS25D4-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 solutions.
The MAX6381–MAX6390 family delivers single/dual-supply μP supervisory circuits optimized for battery-powered and harsh-environment systems where deterministic reset timing, ultra-low quiescent current, and AEC-Q100 compliance are required.
FAQ
What is the exact reset threshold voltage of the MAX6385XS25D4-T and how does it vary with temperature?
The MAX6385XS25D4-T has a nominal reset threshold of 2.50V, specified with ±2.5% tolerance over the full -40°C to +125°C operating range. Its temperature coefficient is 60ppm/°C, meaning the threshold drifts less than ±12.5mV across the entire temperature span. This level of stability is confirmed in the Electrical Characteristics table and Typical Operating Characteristics plots (toc04) of the official datasheet.
Does the MAX6385XS25D4-T support manual reset, and what are the electrical requirements for the MR pin?
Yes, the MAX6385XS25D4-T includes a debounced manual reset (MR) input with a 63kΩ internal pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC (for VTH < 4V) for ≥1µs; the device rejects glitches shorter than 100ns. The MR pin accepts TTL/CMOS logic levels and can be connected directly to a momentary switch to GND - no external components are needed.
What is the guaranteed minimum reset timeout period for the MAX6385XS25D4-T, and how is it triggered?
The MAX6385XS25D4-T guarantees a minimum reset timeout of 1120ms (D4 suffix) after VCC rises above the 2.50V threshold. This timeout is generated by an internal timer that starts upon VCC crossing the threshold and is independent of supply ramp rate. The same 1120ms period applies to VCC-initiated reset; manual reset releases after 140ms (per MAX6390 family timing, though MAX6385 uses D4 for VCC timeout only).
Can the MAX6385XS25D4-T operate reliably at very low supply voltages, and what is its minimum functional VCC?
Yes, the MAX6385XS25D4-T guarantees correct RESET output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Its supply current remains at just 3µA at 1.8V, and the reset comparator continues to function accurately - enabling robust operation during deep brownout conditions common in battery-depleted systems.
Is the MAX6385XS25D4-T pin-compatible with other members of the MAX6381–MAX6390 family, and which packages does it use?
Yes, the MAX6385XS25D4-T shares identical 4-pin SC70 pinout with other XS-suffix variants (e.g., MAX6384XSxxDx-T, MAX6386XSxxDx-T) and is not pin-compatible with 3-pin SC70 or 6-pin μDFN versions. Its pin configuration (VCC, RESET, MR, GND) matches the SC70 top view shown in Figure 9 of the datasheet, and it uses package code X4+1 (outline 21-0098).
MAX6385XS25D4-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:
- 2.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS25D4-T FAQ
1.How can I place an order for MAX6385XS25D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS25D4-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 MAX6385XS25D4-T reliable?
The price and inventory of MAX6385XS25D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS25D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS25D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS25D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS25D4-T?
MAX6385XS25D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS25D4-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 MAX6385XS25D4-T?
For technical support, including MAX6385XS25D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS25D4-T requirements.
6.How does Aetrix verify that MAX6385XS25D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS25D4-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 MAX6385XS25D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS25D4-T?
All MAX6385XS25D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS25D4-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 MAX6385XS25D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS25D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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