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Analog Devices Inc./Maxim Integrated MAX6385XS19D2-T
- Part No.:
- MAX6385XS19D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS19D2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,043
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Product details
Overview
MAX6385XS19D2-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 1.9V reset threshold, 20ms minimum reset timeout, and manual reset input (MR). It monitors VCC from +1.8V to +5.0V, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in battery-powered controllers and portable instrumentation for reliable power-up/brownout protection.
For engineers reviewing the MAX6385XS19D2-T datasheet, MAX6385XS19D2-T pinout, MAX6385XS19D2-T application, or MAX6385XS19D2-T equivalent, key selection criteria include its 1.9V ±2.5% threshold accuracy over –40°C to +125°C, MR debounce capability, 4-pin SC70 package footprint, and compatibility with dual-voltage monitoring systems requiring active-high assertion.
Technical Context
The MAX6385XS19D2-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across temperature, paired with a monolithic timer generating a guaranteed-minimum 20ms reset timeout after VCC recovery. Its internal 63kΩ MR pullup resistor enables direct connection of a momentary switch to GND without external components.
This device operates as a single-supply VCC monitor only - it lacks RESET IN functionality (unlike MAX6387–MAX6389) and does not support auxiliary voltage monitoring. Reset assertion occurs on VCC falling below 1.9V, and deassertion is delayed by the fixed 20ms timeout after VCC rises above threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.90V nominal, ±2.5% over –40°C to +125°C - ensures robust brownout detection across automotive and industrial temperature ranges |
| Reset Timeout | 20ms minimum - provides sufficient hold time for microcontroller initialization before release |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Output Type | Active-high push-pull - drives high without external pullup, compatible with standard CMOS μP reset inputs |
| Manual Reset | MR input with 63kΩ internal pullup - supports direct switch-to-GND interface; no external resistor required |
| Operating Voltage | +1.0V to +5.5V - guarantees functional reset state down to 1V, supporting ultra-low-power wake-up sequencing |
| Reset Propagation Delay | 35μs max (VCC falling) - fast response to supply glitches prevents spurious code execution |
Pinout & Package
MAX6385XS19D2-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, with pins arranged in a single row. Thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail; must be decoupled with 0.1μF capacitor near pin |
| 2 | RESET | Active-high push-pull output; drives high during reset assertion, low otherwise; sinks/source up to 1.2mA |
| 3 | GND | Ground reference for all internal circuitry and reset comparator; requires low-impedance connection to system ground plane |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC (63kΩ); asserting low forces immediate reset for 20ms after release |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.9V threshold | Eliminates external resistor divider; reduces BOM count and layout area in space-constrained portable designs |
| 20ms guaranteed-minimum timeout | Meets JEDEC JESD76B requirements for μP reset hold time without needing external timing capacitors |
| MR input with integrated pullup | Enables direct mechanical switch interface - no external resistor needed, reducing component count and assembly cost |
| Valid reset down to VCC = 1V | Ensures deterministic reset behavior during deep brownout or battery depletion, preventing undefined μP states |
| 3μA supply current at 1.8V | Extends battery life in always-on monitoring applications - e.g., >10 years on CR2032 at 10% duty cycle |
Applications
| Portable Power Management | Industrial Controller Supervision |
|---|---|
Use Scenario: Battery-powered handheld test instrument with Li-ion supply and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts active-high RESET to halt processor during undervoltage events. Use Value: Prevents flash corruption and erratic behavior during battery discharge below 3.0V, leveraging 1.9V threshold headroom and 20ms timeout for safe shutdown. | Use Scenario: Programmable logic controller (PLC) I/O module operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Provides cold-start reset assurance for FPGA configuration and firmware boot sequence. Use Value: ±2.5% threshold accuracy over temperature ensures consistent reset point across wide environmental range, avoiding false resets or missed brownouts. |
| Medical Sensor Node | Dual-Rail Embedded System |
Use Scenario: Wearable ECG sensor using coin cell (1.8V–2.2V) and ultra-low-power MCU. IC Role / Device Role / Timing Role: Acts as primary supervisor for VCC rail, with MR used for user-initiated self-test reset. Use Value: 3μA quiescent current extends operational lifetime; MR's internal pullup eliminates need for discrete resistor in miniaturized PCB layout. | Use Scenario: Industrial gateway with separate 1.2V core and 3.3V I/O supplies. IC Role / Device Role / Timing Role: Monitors 3.3V I/O rail only; coordinated with separate supervisor on core rail via sequenced reset release. Use Value: Active-high push-pull output interfaces directly with 3.3V-tolerant reset inputs; 20ms timeout aligns with power-rail stabilization timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS20D2-T | 2.0V reset threshold (vs. 1.9V); same 20ms timeout, 4-pin SC70, MR input | Suitable where system brownout margin requires higher trip point - e.g., 2.0V LDO dropout tolerance | Select when VCC nominal is ≥2.2V and design requires tighter margin above 2.0V threshold |
| TPS3808G19DBVR | 1.9V threshold, 20ms timeout, but open-drain active-low output and no MR input | Requires external pullup resistor and cannot support manual reset; better suited for legacy μP with active-low reset | Choose only if active-low signaling is mandatory and MR functionality is unnecessary |
Compared with MAX6385XS19D2-T, MAX6385XS20D2-T offers a 100mV higher reset threshold for improved noise immunity in noisy 2.0V+ rails, while TPS3808G19DBVR trades MR and active-high drive for lower cost and TI ecosystem alignment - neither is pin-compatible, requiring layout revision.
Availability
MAX6385XS19D2-T is available at Aetrix Electronics and suitable for portable medical devices, industrial controllers, battery-powered instrumentation, and embedded gateways requiring stable component supply and long-term lifecycle support.
Supply support for MAX6385XS19D2-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 performance.
The MAX6381–MAX6390 family delivers single/dual-supply microprocessor supervisors optimized for ultra-low quiescent current, tight threshold accuracy, and compact packaging - targeting space- and power-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6385XS19D2-T and how tightly is it specified?
The MAX6385XS19D2-T has a nominal reset threshold of 1.90V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). At +25°C, the threshold is specified as 1.85V (min) to 1.95V (max). This accuracy is achieved via factory laser trimming and is documented in the Electrical Characteristics table of the official datasheet.
Does MAX6385XS19D2-T support monitoring a second voltage rail like VCORE?
No, MAX6385XS19D2-T monitors only the VCC supply rail. It does not include a RESET IN input - that feature is exclusive to MAX6387/MAX6388/MAX6389 variants. For dual-rail supervision, a second supervisor (e.g., MAX6387XS19D2-T) or a dedicated dual-input device is required.
What is the function and electrical behavior of the MR pin on MAX6385XS19D2-T?
The MR pin on MAX6385XS19D2-T is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces immediate reset assertion; reset remains active for the full 20ms timeout after MR returns high. The pin accepts TTL/CMOS logic levels and tolerates voltages from –0.3V to (VCC + 0.3V).
Can MAX6385XS19D2-T operate reliably when VCC drops below 1.8V?
Yes - MAX6385XS19D2-T is fully specified down to VCC = 1.0V. Its reset output remains valid (correct logic state) even at 1.0V, and supply current drops to ~3μA at 1.8V. Below 1.0V, operation is not guaranteed; for VCC = 0V compatibility, external pullup/pulldown resistors are recommended per Figure 2 in the datasheet.
Is MAX6385XS19D2-T pin-compatible with older Maxim reset ICs like MAX809?
Yes, MAX6385XS19D2-T is pin-compatible with MAX809/MAX810/MAX803 and other listed predecessors in the same 4-pin SC70 package. However, note that MAX809 is active-low, while MAX6385XS19D2-T is active-high - direct replacement requires verification of target μP reset polarity and may necessitate schematic updates.
MAX6385XS19D2-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:
- 1.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS19D2-T FAQ
1.How can I place an order for MAX6385XS19D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS19D2-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 MAX6385XS19D2-T reliable?
The price and inventory of MAX6385XS19D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS19D2-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS19D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS19D2-T transactions.
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4.How is shipping managed for MAX6385XS19D2-T?
MAX6385XS19D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS19D2-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 MAX6385XS19D2-T?
For technical support, including MAX6385XS19D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS19D2-T requirements.
6.How does Aetrix verify that MAX6385XS19D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS19D2-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 MAX6385XS19D2-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS19D2-T?
All MAX6385XS19D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS19D2-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 MAX6385XS19D2-T part is unused and in its original packaging.
Return procedure for MAX6385XS19D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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