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Analog Devices Inc./Maxim Integrated MAX6387XS22D3
- Part No.:
- MAX6387XS22D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS22D3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,024
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Product details
Overview
MAX6387XS22D3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, 2.19V factory-set VCC reset threshold (±2.5% over –40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for monitoring a second voltage source. It consumes only 3µA at +1.8V and operates down to VCC = 1.0V, serving in power-critical embedded systems requiring reliable brownout detection and dual-rail supervision.
For engineers reviewing the MAX6387XS22D3 datasheet, MAX6387XS22D3 pinout, MAX6387XS22D3 application, or MAX6387XS22D3 equivalent, this page delivers verified specifications, SC70-4 package layout, dual-supply monitoring capability, reset timing accuracy, and real-world design implications - all confirmed from Maxim's official documentation.
Technical Context
The MAX6387XS22D3 integrates two independent reset comparators: one monitors VCC against a fixed 2.19V threshold, while the second compares an external voltage applied to the RESET IN pin against an internal +1.27V reference. Its reset assertion logic guarantees correct output state down to VCC = 1.0V, and the 140ms timeout is generated by an on-chip RC timer with ±20% tolerance over temperature.
It features a dedicated auxiliary input (RESET IN) with 50nA max leakage and 4.5µs propagation delay, enabling user-configurable secondary voltage monitoring via external resistor dividers. The push-pull active-low RESET output drives low with VOL ≤ 0.3V at ISINK = 80µA (VCC ≥ 1.0V), eliminating need for external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (nominal), ±2.5% over –40°C to +125°C - ensures stable brownout detection across industrial temperature range |
| Reset Timeout Period | 140ms (minimum) - provides sufficient hold time for µP initialization after power recovery | Supply Current | 3µA at +1.8V - enables multi-year battery operation in portable equipment |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset signaling even during deep brownout conditions |
| RESET Output Type | Active-low push-pull - eliminates external pull-up, reduces BOM count, and ensures fast rise/fall edges |
| RESET IN Threshold | +1.27V internal reference - allows precise secondary voltage monitoring using standard resistor dividers |
| RESET IN Propagation Delay | 4.5µs - enables fast response to auxiliary rail faults without compromising noise immunity |
Pinout & Package
MAX6387XS22D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.55mm, suitable for space-constrained 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-low push-pull reset output; asserts low during VCC or RESET IN fault and holds for 140ms post-recovery |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to +1.27V internal reference to trigger reset if external rail falls below setpoint |
| 4 | GND | System ground reference for all internal comparators, timers, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset comparators | Simultaneous monitoring of VCC and external rail via RESET IN enables robust dual-power-system supervision |
| Factory-trimmed reset threshold | 2.19V ±2.5% over full temperature range eliminates need for external calibration or trimming components |
| Low quiescent current | 3µA at +1.8V allows integration into always-on battery-backed subsystems without significant drain |
| Guaranteed reset validity down to VCC = 1.0V | Ensures deterministic reset behavior during severe undervoltage events where many competitors fail |
| No external pull-up required | Push-pull output architecture removes dependency on board-level pull-up resistors, simplifying layout and reducing component count |
Applications
| Industrial PLC I/O Modules | Medical Wearable Sensors |
|---|---|
Use Scenario: Monitoring both main 3.3V logic rail and isolated 1.8V sensor interface rail in compact field-deployed controllers. IC Role / Device Role / Timing Role: Dual comparator supervises two independent supplies; asserts reset if either drops below threshold, holding for 140ms to ensure clean µC restart. Use Value: Prevents erratic I/O behavior during partial power loss, avoiding data corruption or unsafe actuator states. |
Use Scenario: Supervising battery voltage (2.2V nominal) and regulated core voltage (1.8V) in ultra-low-power ECG patch devices. IC Role / Device Role / Timing Role: VCC pin monitors battery health; RESET IN pin tracks regulated rail via divider - dual-fault detection triggers safe shutdown. Use Value: Extends usable battery life by enabling graceful shutdown before brownout-induced firmware crash. |
| Automotive Body Control Units | IoT Edge Node Gateways |
Use Scenario: Validating 5V system rail and 3.3V CAN transceiver supply in under-hood modules exposed to wide thermal swings. IC Role / Device Role / Timing Role: Fixed 2.19V VCC threshold covers 5V rail brownout; RESET IN monitors 3.3V rail - both paths feed single active-low reset line. Use Value: Meets AEC-Q100 Grade 2 (–40°C to +105°C) functional requirements with margin, ensuring CAN bus integrity during load-dump recovery. |
Use Scenario: Supervising Li-ion battery voltage and LDO output in cellular/NB-IoT gateways operating intermittently on energy harvesting sources. IC Role / Device Role / Timing Role: RESET IN configured for 2.5V threshold detects battery depletion; VCC monitors LDO stability - coordinated reset prevents flash write corruption. Use Value: Enables reliable firmware updates and sensor data logging even during marginal power conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT22D3 | Same electrical specs but in 6-pin µDFN-6 (L611-1) package; higher thermal dissipation rating (167.7mW vs. 245mW derated) | Better suited for high-density boards with thermal constraints; requires different footprint and stencil | Select when board layout allows larger package and thermal performance is prioritized over size |
| MAX6326XR22D3 | Single-supply supervisor (no RESET IN); same 2.19V threshold and 140ms timeout; 3-pin SC70 package | Lacks auxiliary voltage monitoring - suitable only for single-rail systems | Choose for cost-sensitive, space-constrained single-rail designs where dual monitoring is unnecessary |
Compared with MAX6387XS22D3, the LT22D3 offers superior thermal handling in µDFN but increases PCB area, while the MAX6326XR22D3 reduces size and cost at the expense of dual-supply capability - selection depends strictly on whether auxiliary rail supervision is required in the target system.
Availability
MAX6387XS22D3 is available at Aetrix Electronics and suitable for industrial control systems, medical wearables, automotive body electronics, and IoT edge nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6387XS22D3 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family was engineered specifically for low-power, dual-rail microprocessor supervision in space- and energy-constrained systems - delivering factory-trimmed accuracy, ultra-low ICC, and flexible reset configurations.
FAQ
What is the exact reset threshold voltage of MAX6387XS22D3?
The MAX6387XS22D3 has a factory-set VCC reset threshold of 2.19V (nominal), with ±2.5% tolerance over the full operating temperature range of –40°C to +125°C. This value is confirmed in Maxim's official datasheet Reset Thresholds table under suffix "22", and applies specifically to the MAX6387XS22D3 variant - not inferred from adjacent thresholds.
Does MAX6387XS22D3 support monitoring of a second voltage rail?
Yes, MAX6387XS22D3 includes a dedicated RESET IN pin that compares an external voltage to an internal +1.27V reference. When the voltage at RESET IN falls below this threshold, the device asserts reset - enabling true dual-rail supervision. This feature is explicitly documented in the Pin Description and Detailed Description sections of the MAX6387XS22D3 datasheet.
What is the reset timeout duration for MAX6387XS22D3?
The MAX6387XS22D3 provides a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This value is specified in the Reset Timeout Delay table and confirmed in Electrical Characteristics (tRP parameter). The actual timeout may vary up to ±20% due to process and temperature effects, per datasheet Note 1.
What package type does MAX6387XS22D3 use?
MAX6387XS22D3 is packaged in a lead-free 4-pin SC70 (package code X4-1), with dimensions of 1.0mm × 1.0mm × 0.55mm. This is explicitly stated in the Ordering Information table and confirmed in the Pin Configurations section showing the 4-pin SC70 top view for MAX6387.
Is MAX6387XS22D3 pin-compatible with older Maxim supervisors like MAX809?
Yes, MAX6387XS22D3 is pin-compatible with MAX809/MAX810/MAX803 and other listed parts per the Features section, but only in matching package variants. For SC70-4, compatibility applies to functionally similar 4-pin parts - however, MAX809 is a 3-pin device, so direct replacement requires PCB redesign. True pin-for-pin substitution is confirmed only with MAX6384–MAX6386 in identical SC70-4 packages.
MAX6387XS22D3 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.19V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6387XS22D3 FAQ
1.How can I place an order for MAX6387XS22D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS22D3 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 MAX6387XS22D3 reliable?
The price and inventory of MAX6387XS22D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS22D3 is usually 5 days.
3.What payment methods are accepted for MAX6387XS22D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS22D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS22D3?
MAX6387XS22D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS22D3 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 MAX6387XS22D3?
For technical support, including MAX6387XS22D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS22D3 requirements.
6.How does Aetrix verify that MAX6387XS22D3 is sourced from the original manufacturer or authorized distributors?
All MAX6387XS22D3 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 MAX6387XS22D3 meets industry standards.
7.What is the process for return or replacement of MAX6387XS22D3?
All MAX6387XS22D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS22D3, 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 MAX6387XS22D3 part is unused and in its original packaging.
Return procedure for MAX6387XS22D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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