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Analog Devices Inc./Maxim Integrated MAX6385XS26D4-T
- Part No.:
- MAX6385XS26D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS26D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,759
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Product details
Overview
MAX6385XS26D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 2.63V reset threshold, 1120ms 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. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6385XS26D4-T datasheet, MAX6385XS26D4-T pinout, MAX6385XS26D4-T application, or MAX6385XS26D4-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), MR input pullup resistance (63kΩ), open-drain vs. push-pull output compatibility, and SC70-4 package footprint constraints.
Technical Context
The MAX6385XS26D4-T implements a precision bandgap-based voltage comparator with ±2.5% threshold tolerance across temperature, paired with a monotonic RC-based timeout timer. Its active-high push-pull RESET output drives high during fault conditions and deasserts cleanly after the 1120ms minimum timeout period.
It integrates a debounced manual reset input (MR) with internal 63kΩ pullup to VCC, supporting TTL/CMOS logic levels and momentary switch interfaces without external components. The device operates over full industrial temperature range (–40°C to +125°C) and maintains guaranteed reset state validity down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (factory-set, ±2.5% over –40°C to +125°C) |
| VCC Reset Timeout | 1120ms min (ensures μP initialization completes before release) |
| Manual Reset Timeout | 1120ms min (same as VCC timeout per MAX6385 family spec) |
| Supply Current | 3μA at +1.8V (enables multi-year battery life in always-on monitoring) |
| Operating Voltage Range | +1.0V to +5.5V (supports operation during deep brownout recovery) |
| Output Type | Active-high push-pull (drives high during reset; no external pullup required) |
| MR Input Pullup | 63kΩ internal resistor (allows direct switch-to-GND interface) |
Pinout & Package
MAX6385XS26D4-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. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input and primary voltage monitor | Supplies internal circuitry and serves as reference for fixed-threshold reset detection |
| RESET (Pin 2) | Active-high push-pull reset output | Drives high during reset assertion; sinks current when low; no external pullup needed |
| MR (Pin 3) | Active-low manual reset input | Logic-low pulse forces reset; internal 63kΩ pullup enables switch-only interface |
| GND (Pin 4) | Ground reference | Return path for all internal currents and reset output sink current |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.63V with ±2.5% accuracy over –40°C to +125°C ensures consistent brownout response across environments |
| Guaranteed reset validity down to VCC = 1V | Enables robust reset signaling even during severe undervoltage transients before complete power collapse |
| Debounced manual reset input | Internal 63kΩ pullup and 1µs MR pulse width requirement eliminate need for external RC debounce |
| Negative-going VCC transient immunity | Withstands sub-100µs glitches below threshold without spurious reset assertion (per Typical Operating Characteristics) |
| Low-power operation | 3μA supply current at +1.8V allows integration into energy-constrained IoT sensor nodes |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Power Monitoring |
|---|---|
Use Scenario: Wearable health monitor operating from coin-cell battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises main LDO output (+2.8V) and asserts active-high RESET to ARM Cortex-M0+ during brownout. Use Value: Prevents corrupted flash writes by holding processor in reset until supply stabilizes above 2.63V for ≥1120ms. | Use Scenario: Industrial PLC controller with dual-rail power (3.3V core, 5V I/O) requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Monitors 3.3V rail and provides synchronized reset signal to microcontroller and FPGA configuration logic. Use Value: Ensures deterministic startup by guaranteeing 1120ms minimum assertion time, eliminating race conditions during power ramp. |
| Computers | Controllers |
Use Scenario: Embedded single-board computer (SBC) with USB-C PD input and buck-boost regulation. IC Role / Device Role / Timing Role: Acts as primary supervisor for 1.8V DDR memory supply, interfacing directly with SoC's nRESET pin. Use Value: Active-high push-pull output matches SoC input polarity, eliminating level-shifter and reducing BOM count. | Use Scenario: Smart HVAC controller using low-power MCU and isolated RS-485 transceiver. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and provides reset to MCU and transceiver enable line via shared RESET net. Use Value: Internal MR input allows front-panel reset button to force full system restart without firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS26D3-T | 140ms reset timeout (vs. 1120ms) | Suitable for fast-boot systems where minimal reset hold time is required | Select when shorter reset duration is acceptable and faster system wake-up is prioritized |
| MAX6385LT26D4-T | 6-pin μDFN package (vs. 4-pin SC70); identical electrical specs | Requires different PCB footprint and land pattern (90-0080 vs. 90-0187) | Select when higher thermal performance (θJA = 477°C/W vs. 322.6°C/W) or board space permits larger package |
Compared with MAX6385XS26D4-T, the D3 variant reduces reset hold time by 87.5% enabling rapid recovery, while the LT variant trades smaller footprint for improved thermal dissipation in thermally constrained layouts - both retain identical 2.63V threshold and MR functionality.
Availability
MAX6385XS26D4-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and industrial controllers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6385XS26D4-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, sensing, and connectivity applications in industrial, automotive, and computing 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 exact reset threshold voltage of MAX6385XS26D4-T?
The MAX6385XS26D4-T has a factory-set reset threshold of 2.63V, with guaranteed accuracy 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 and applies specifically to the "26" suffix in the MAX6385XS26D4-T part number.
Does MAX6385XS26D4-T support manual reset functionality?
Yes, MAX6385XS26D4-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, which remains active for the full 1120ms timeout period after MR is released. No external components are required for basic switch interfacing.
What package type and dimensions does MAX6385XS26D4-T use?
MAX6385XS26D4-T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. Its land pattern is documented as 90-0187, and it is RoHS-compliant (indicated by the "+T" suffix). This compact footprint supports high-density PCB layouts in portable electronics.
How does the reset timeout behavior differ between VCC drop and manual reset on MAX6385XS26D4-T?
For MAX6385XS26D4-T, both VCC dropout and MR assertion trigger the same 1120ms minimum reset timeout period. Unlike the MAX6390, this part does not implement separate VCC and MR timeout durations - the "D4" suffix specifies 1120ms for both events, as defined in the MAX6385 family timing table.
Is MAX6385XS26D4-T compatible with systems requiring reset assertion down to very low supply voltages?
Yes, MAX6385XS26D4-T guarantees correct RESET output logic state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures reliable reset signaling during deep brownout conditions before complete power loss, a key requirement for fail-safe embedded systems.
MAX6385XS26D4-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:
- 2.63V
- 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
MAX6385XS26D4-T FAQ
1.How can I place an order for MAX6385XS26D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS26D4-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 MAX6385XS26D4-T reliable?
The price and inventory of MAX6385XS26D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS26D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS26D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS26D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS26D4-T?
MAX6385XS26D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS26D4-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 MAX6385XS26D4-T?
For technical support, including MAX6385XS26D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS26D4-T requirements.
6.How does Aetrix verify that MAX6385XS26D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS26D4-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 MAX6385XS26D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS26D4-T?
All MAX6385XS26D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS26D4-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 MAX6385XS26D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS26D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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