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Analog Devices Inc./Maxim Integrated MAX6385XS22D3
- Part No.:
- MAX6385XS22D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS22D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,877
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Product details
Overview
The MAX6385XS22D3 from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 2.19V reset threshold, 140ms minimum reset timeout, and manual reset input. It monitors VCC in low-voltage systems (1.0V–5.5V), consumes only 3µA at 1.8V, and guarantees valid reset output down to VCC = 1V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6385XS22D3 datasheet, MAX6385XS22D3 pinout, MAX6385XS22D3 application, or MAX6385XS22D3 equivalent, key selection criteria include its active-high push-pull output, 2.19V ±2.5% threshold accuracy over –40°C to +125°C, 140ms VCC reset timeout, integrated MR pullup resistor (~63kΩ), and SC70-4 package compatibility with space-constrained embedded designs.
Technical Context
This device implements a precision bandgap-based voltage comparator with internal 1.27V reference for threshold detection, coupled with a temperature-compensated RC timer for deterministic reset timeout. The reset assertion logic responds to VCC falling below 2.19V or MR being pulled low, holding RESET high for ≥140ms after recovery.
The manual reset input features internal 63kΩ pullup to VCC, supports TTL/CMOS logic levels, and provides glitch rejection of 100ns. Reset output state remains guaranteed for VCC ≥1.0V, enabling robust operation during deep brownout conditions without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V ±2.5% over –40°C to +125°C - ensures accurate brownout detection across industrial temperature range |
| Reset Timeout | 140ms minimum - provides sufficient hold time for µP initialization before release |
| Supply Current | 3µA at VCC = 1.8V - enables multi-year battery life in always-on monitoring applications |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor, drives directly into µP reset pin |
| MR Input | Internal 63kΩ pullup - allows direct switch-to-GND connection without external components |
| Operating Voltage | 1.0V to 5.5V - supports single-supply operation from Li-ion, coin cell, or regulated rails |
| Tempco | 60ppm/°C - maintains threshold stability across wide temperature excursions |
Pinout & Package
MAX6385XS22D3 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.0mm × 1.0mm × 0.5mm, suitable for ultra-compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node; powers internal circuitry and sets fixed reset threshold |
| 2 | RESET | Active-high push-pull output; asserts high during fault condition and holds for ≥140ms after recovery |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 63kΩ resistor; debounced by design |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.19V with ±2.5% tolerance over full temperature range - eliminates external resistor network and calibration effort |
| Guaranteed reset validity | Operates correctly down to VCC = 1.0V - prevents spurious resets during deep undervoltage events |
| Negative-going transient immunity | Rejects VCC glitches <35µs at 100mV overdrive - improves noise resilience in electrically noisy environments |
| Low-power optimization | 3µA supply current at 1.8V - extends battery life in portable medical, IoT, and wearables |
| SC70-4 footprint | 1.0mm × 1.0mm body size - enables placement in tight spaces where larger SOT-23 or SOIC packages are impractical |
Applications
| Portable Medical Devices | Battery-Powered Sensors |
|---|---|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises VCC during cold-start and battery sag; asserts active-high RESET to hold MCU in reset until stable 3.0V rail is established. Use Value: Prevents firmware crash due to marginal supply during RF burst; 140ms timeout ensures complete ADC and radio initialization before release. | Use Scenario: Wireless environmental sensor node using Li-SOCl₂ primary battery with 10-year shelf life. IC Role / Device Role / Timing Role: Monitors main supply and triggers reset on slow battery decay; MR pin enables field firmware update initiation via button press. Use Value: 3µA quiescent current minimizes self-discharge; internal MR pullup eliminates BOM cost and layout area for external resistor. |
| Industrial Control Modules | Smart Metering Units |
Use Scenario: DIN-rail mounted PLC I/O module operating from 3.3V DC-DC converter with variable load transients. IC Role / Device Role / Timing Role: Detects brownout caused by motor startup surges; generates clean, glitch-free reset pulse to ARM Cortex-M4 core. Use Value: 60ppm/°C tempco maintains threshold accuracy across –40°C to +85°C ambient; push-pull output drives reset net without external components. | Use Scenario: AMI smart meter with dual-rail architecture (3.3V MCU + 1.8V metrology ASIC). IC Role / Device Role / Timing Role: Primary supervisor for 3.3V rail; coordinates power-up sequencing and validates stable supply before enabling communication interface. Use Value: 2.19V threshold aligns with 3.3V rail's 35% dropout margin; 140ms timeout exceeds typical PMIC power-good assertion delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385LT22D3 | Same electrical specs but in 6-pin µDFN-6 (L611-1) package; 1.5mm × 1.0mm footprint | Requires different PCB land pattern; better thermal performance in high-density layouts | Select when board space allows larger package and improved thermal dissipation is needed |
| TPS3808G12DBVR | TI part with 1.2V threshold, 200ms timeout, 1.8V–6.0V operation, and open-drain output | Requires external pullup; different timing and threshold - not drop-in compatible | Choose only if redesign accommodates open-drain interface and 1.2V threshold meets system requirements |
Compared with MAX6385XS22D3, the LT22D3 variant offers identical functionality in a thermally superior µDFN package but increases PCB area by 50%; the TPS3808G12DBVR requires schematic and layout changes due to open-drain output and mismatched threshold/timing, making it a functional alternative rather than a pin-compatible replacement.
Availability
MAX6385XS22D3 is available at Aetrix Electronics and suitable for portable medical devices, battery-powered sensors, industrial control modules, and smart metering units requiring stable component supply and long-term production continuity.
Supply support for MAX6385XS22D3 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.
The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for space- and energy-constrained embedded systems requiring reliable power-on reset and brownout protection.
FAQ
What is the exact reset threshold voltage of MAX6385XS22D3?
The MAX6385XS22D3 has a factory-set reset threshold of 2.19V, specified with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet under suffix "22", and applies directly to the MAX6385XS22D3 part number.
Does MAX6385XS22D3 support manual reset functionality?
Yes, MAX6385XS22D3 includes a dedicated MR (manual reset) input on pin 3. It features an internal 63kΩ pullup resistor to VCC, allowing direct connection of a momentary switch to GND. When MR is pulled low, MAX6385XS22D3 asserts its active-high RESET output for the full 140ms timeout period after MR is released.
What package type and dimensions does MAX6385XS22D3 use?
MAX6385XS22D3 uses the 4-pin SC70 package (package code X4-1), with nominal dimensions of 1.0mm × 1.0mm × 0.5mm. The pinout is VCC (pin 1), RESET (pin 2), MR (pin 3), and GND (pin 4), as documented in the "Pin Configurations" section of the MAX6381–MAX6390 datasheet.
Can MAX6385XS22D3 operate reliably at VCC = 1.2V?
Yes, MAX6385XS22D3 guarantees correct reset output behavior down to VCC = 1.0V, including proper assertion and deassertion timing. At 1.2V, the device remains fully functional: the 2.19V threshold comparison is internally referenced, and the 140ms timeout timer operates correctly, ensuring robust brownout response even in ultra-low-voltage scenarios.
How does the reset timeout of MAX6385XS22D3 compare to MAX6385XS22D5?
MAX6385XS22D3 provides a 140ms minimum reset timeout, while MAX6385XS22D5 offers 280ms. Both share identical reset threshold (2.19V), package (SC70-4), and MR functionality. The timeout difference is solely defined by the suffix "D3" vs. "D5", per the Reset Timeout Delay table - no other electrical or functional differences exist between these variants.
MAX6385XS22D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.19V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS22D3 FAQ
1.How can I place an order for MAX6385XS22D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS22D3 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 MAX6385XS22D3 reliable?
The price and inventory of MAX6385XS22D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS22D3 is usually 5 days.
3.What payment methods are accepted for MAX6385XS22D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS22D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS22D3?
MAX6385XS22D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS22D3 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 MAX6385XS22D3?
For technical support, including MAX6385XS22D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS22D3 requirements.
6.How does Aetrix verify that MAX6385XS22D3 is sourced from the original manufacturer or authorized distributors?
All MAX6385XS22D3 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 MAX6385XS22D3 meets industry standards.
7.What is the process for return or replacement of MAX6385XS22D3?
All MAX6385XS22D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS22D3, 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 MAX6385XS22D3 part is unused and in its original packaging.
Return procedure for MAX6385XS22D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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