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Analog Devices Inc./Maxim Integrated MAX6385XS44D5-T
- Part No.:
- MAX6385XS44D5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS44D5-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,444
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Product details
Overview
MAX6385XS44D5-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.38V reset threshold, 280ms minimum VCC reset timeout, and manual reset input. It monitors +1.8V to +5.0V supply rails while consuming only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in battery-powered controllers and critical μP power monitoring systems.
For engineers reviewing the MAX6385XS44D5-T datasheet, MAX6385XS44D5-T pinout, MAX6385XS44D5-T application, or MAX6385XS44D5-T equivalent, key selection factors include its active-high push-pull reset output, ±2.5% threshold accuracy over –40°C to +125°C, 4-pin SC70 package, MR debounce capability, and immunity to negative-going VCC transients.
Technical Context
The MAX6385XS44D5-T implements a precision voltage comparator with internal 4.38V reference and a monostable timer for reset assertion. Its MR input features an internal 63kΩ pullup resistor and supports TTL/CMOS logic levels, enabling direct switch or logic-driven reset initiation without external components.
Reset assertion occurs when VCC falls below 4.38V (±2.5% over temperature) or MR is pulled low; reset remains asserted for ≥280ms after VCC recovers or MR is released. The push-pull output drives high during reset, ensuring compatibility with active-high μP reset inputs and eliminating need for external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges |
| VCC Reset Timeout | 280ms minimum - provides sufficient hold time for μP initialization and memory stabilization after power recovery |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered portable instrumentation |
| Output Type | Active-high push-pull - eliminates external pullup resistor, reduces BOM count, and ensures fast rise/fall times |
| MR Input | Debounced manual reset with 63kΩ internal pullup - supports momentary switch interface without external RC network |
| Operating Voltage | +1.0V to +5.5V - guarantees functional reset assertion even during deep brownout conditions down to 1V |
| Reset Propagation Delay | 35µs max (VCC falling at 10mV/µs) - enables rapid response to fast supply glitches |
Pinout & Package
MAX6385XS44D5-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. This compact footprint supports high-density PCB layouts in space-constrained portable and embedded applications.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - powers internal circuitry and serves as reset threshold reference point |
| 2 | RESET | Active-high push-pull output - asserts high during reset condition and deasserts low upon timeout completion |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC via 63kΩ resistor |
| 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 4.38V threshold | Eliminates external resistor divider, reducing component count and layout area while maintaining ±2.5% accuracy over full temperature range |
| 280ms guaranteed reset timeout | Ensures μP reset pulse meets JEDEC JESD8-12E and Intel PCH specification minimum durations for reliable boot sequencing |
| MR input with internal pullup | Enables direct connection of normally open momentary switch to GND - no external resistor or capacitor required for basic manual reset function |
| Negative-going transient immunity | Withstands VCC glitches up to 100mV below threshold for durations ≤10µs - prevents spurious resets in noisy power environments |
| Valid reset output down to VCC = 1V | Guarantees correct logic state during deep brownout, supporting fail-safe shutdown in low-voltage battery systems |
Applications
| Battery-Powered Instrumentation | Industrial Controller Power Monitoring |
|---|---|
|
Use Scenario: Portable multimeter with Li-ion battery supply experiencing gradual discharge and intermittent load spikes. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers controlled shutdown before brownout-induced firmware corruption. Use Value: 3μA quiescent current extends battery life; 4.38V threshold aligns with 3.3V LDO dropout margin; 280ms timeout accommodates slow battery recovery. |
Use Scenario: PLC I/O module operating in factory environment with fluctuating 24V DC input converted to 5V/3.3V rails. IC Role / Device Role / Timing Role: Monitors 5V microcontroller supply and asserts reset on undervoltage events caused by line sags or regulator faults. Use Value: ±2.5% threshold accuracy ensures consistent trip point across –40°C to +85°C ambient; push-pull output drives long traces without signal degradation. |
| Automotive Body Control Module | Medical Diagnostic Handheld |
|
Use Scenario: BCM powered from vehicle battery subject to cold-crank transients and load-dump surges. IC Role / Device Role / Timing Role: Provides AEC-Q100 qualified supervision of 3.3V MCU core supply, with MR input for service-mode reset. Use Value: Negative-going transient immunity prevents false resets during cranking; 4-pin SC70 fits tight CAN/LIN interface board real estate. |
Use Scenario: Ultrasound probe with dual-rail power (1.8V analog front-end, 3.3V digital processor) and strict safety-critical boot validation. IC Role / Device Role / Timing Role: Ensures deterministic reset sequence for FPGA configuration and ADC calibration startup routines. Use Value: 280ms timeout exceeds typical FPGA configuration time; active-high output matches processor reset polarity requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS44D3-T | 140ms VCC reset timeout (vs. 280ms) | Suitable for faster-booting MCUs with shorter initialization sequences | Select when system boot time requires shorter reset hold duration without compromising reliability |
| MAX6385XS44D6-T | 560ms VCC reset timeout (vs. 280ms) | Required for complex SoCs with extended PLL lock or DDR training phases | Choose when downstream logic demands longer reset assertion to ensure complete hardware initialization |
Compared with MAX6385XS44D3-T and MAX6385XS44D6-T, the MAX6385XS44D5-T offers a balanced 280ms reset timeout that satisfies most ARM Cortex-M and RISC-V MCU boot requirements while avoiding unnecessary delay in time-sensitive embedded control loops.
Availability
MAX6385XS44D5-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controller power monitoring, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for MAX6385XS44D5-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 power management, sensing, and interface applications in industrial, automotive, and medical markets.
The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for reliable reset generation in space- and energy-constrained embedded systems.
FAQ
What is the reset threshold voltage of the MAX6385XS44D5-T?
The MAX6385XS44D5-T has a factory-set reset threshold of 4.38V (nominal), with ±2.5% tolerance over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet and applies specifically to the "44" suffix in the part number. The MAX6385XS44D5-T uses this fixed threshold to monitor VCC and assert reset when supply voltage drops below this level.
Does the MAX6385XS44D5-T support manual reset functionality?
Yes, the MAX6385XS44D5-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset, which remains active for the full 280ms timeout period after MR is released. This feature is explicitly documented for MAX6385 in the Features and Pin Description sections, and the "XS" prefix confirms 4-pin SC70 packaging with MR support.
What package type is used for the MAX6385XS44D5-T?
The MAX6385XS44D5-T is packaged in a 4-pin SC70 (SOT-323) outline, identified by package code X4+1, outline number 21-0098, and land pattern 90-0187. This RoHS-compliant package measures 2.0mm × 2.1mm × 0.95mm and is specified in the Ordering Information table for all MAX6384–MAX6390 "XS" variants, including MAX6385XS44D5-T.
How does the MAX6385XS44D5-T behave during brownout conditions?
The MAX6385XS44D5-T guarantees valid reset output down to VCC = 1V, meaning its RESET pin maintains correct logic state (high during reset, low otherwise) even during severe brownout. When VCC falls below 4.38V, RESET asserts high and remains high for ≥280ms after VCC rises above threshold. This behavior is verified in Electrical Characteristics and Detailed Description sections.
Is the MAX6385XS44D5-T compatible with other Maxim reset ICs?
The MAX6385XS44D5-T is pin-compatible with MAX809/MAX810/MAX803 and several MAX63xx series devices, as stated in the Features section. However, functional compatibility depends on matching reset polarity (active-high push-pull), threshold (4.38V), and timeout (280ms). Substituting non-identical variants may require layout or firmware changes due to differing timing or output drive characteristics.
MAX6385XS44D5-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:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 280ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS44D5-T FAQ
1.How can I place an order for MAX6385XS44D5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS44D5-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 MAX6385XS44D5-T reliable?
The price and inventory of MAX6385XS44D5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS44D5-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS44D5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS44D5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS44D5-T?
MAX6385XS44D5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS44D5-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 MAX6385XS44D5-T?
For technical support, including MAX6385XS44D5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS44D5-T requirements.
6.How does Aetrix verify that MAX6385XS44D5-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS44D5-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 MAX6385XS44D5-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS44D5-T?
All MAX6385XS44D5-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS44D5-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 MAX6385XS44D5-T part is unused and in its original packaging.
Return procedure for MAX6385XS44D5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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