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Analog Devices Inc./Maxim Integrated MAX6385XS43D1-T
- Part No.:
- MAX6385XS43D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS43D1-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,812
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Product details
Overview
MAX6385XS43D1-T from Maxim Integrated is a precision active-high push-pull μP supervisory circuit designed for reliable power-on reset and brownout detection in low-voltage embedded systems. It features a factory-set 4.30V reset threshold (±2.5% over −40°C to +125°C), 1ms minimum reset timeout, 3μA supply current at +1.8V, and guaranteed valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring stable voltage monitoring and deterministic reset assertion.
For engineers reviewing the MAX6385XS43D1-T datasheet, MAX6385XS43D1-T pinout, MAX6385XS43D1-T application, or MAX6385XS43D1-T equivalent, key selection criteria include its 4-pin SC70 package, active-high push-pull output, manual reset input with internal pullup, and compatibility with dual-voltage system supervision where precise 4.3V VCC monitoring is required.
Technical Context
The MAX6385XS43D1-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across −40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 1ms reset assertion period after VCC rises above 4.30V, independent of supply ramp rate.
It integrates a debounced manual reset input (MR) with 63kΩ internal pullup and supports reset assertion via either VCC drop below threshold or MR low pulse ≥1µs. The active-high push-pull output drives high during reset and guarantees logic-valid state down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.30V nominal, ±2.5% over −40°C to +125°C - ensures accurate 4.3V supply monitoring without external calibration |
| Reset Timeout | 1ms minimum - provides sufficient hold time for microprocessor initialization after power-up |
| Supply Current | 3μA at +1.8V - enables ultra-low-power operation in battery-critical applications |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to μP reset input |
| Manual Reset Input | MR with 63kΩ internal pullup - allows momentary switch connection without external components |
| Operating Voltage | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| Reset Propagation Delay | 35μs max (VCC falling at 10mV/µs) - ensures fast response to supply transients |
Pinout & Package
MAX6385XS43D1-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for space-constrained PCB layouts with 0.65mm pitch and 1.3mm × 1.1mm footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - must be connected to the system's main 4.3V supply |
| 2 | RESET | Active-high push-pull reset output - asserts high during reset condition and deasserts low when VCC > 4.30V for ≥1ms |
| 3 | MR | Active-low manual reset input - pulling low forces reset; internal 63kΩ pullup holds high when unused |
| 4 | GND | Ground reference for all internal circuits and reset comparator - requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.30V threshold | Eliminates external resistor divider and reduces BOM count in fixed-threshold designs |
| 1ms minimum reset timeout | Meets minimum reset hold-time requirements for most 8-/16-bit microcontrollers without timing margin risk |
| 3μA supply current at 1.8V | Extends battery life in always-on portable instrumentation by minimizing quiescent drain |
| MR input with internal pullup | Reduces component count and board area by removing need for external pullup resistor |
| Valid reset output down to VCC = 1V | Ensures deterministic reset behavior during deep undervoltage events before complete power collapse |
Applications
| Portable/Battery-Powered Equipment | Dual Voltage Systems |
|---|---|
Use Scenario: Handheld medical sensor with Li-ion battery and dual-rail (3.3V I/O, 1.8V core) power architecture. IC Role / Device Role / Timing Role: Monitors 3.3V rail for brownout and asserts active-high reset to MCU upon drop below 4.30V; manual reset via front-panel button. Use Value: Prevents erratic MCU operation during battery discharge while enabling field service reset without power cycle. | Use Scenario: Industrial PLC module with separate 5V control logic and 3.3V communication interface rails. IC Role / Device Role / Timing Role: Supervises 5V rail using 4.30V threshold to ensure clean startup of both domains; 1ms timeout aligns with slowest power rail stabilization. Use Value: Guarantees synchronized reset release across voltage domains, eliminating race conditions during power-up. |
| Computers | Intelligent Instruments |
Use Scenario: Embedded controller in fanless edge computing node with tight thermal envelope and 4.3V auxiliary supply. IC Role / Device Role / Timing Role: Provides fail-safe reset on 4.3V rail powering FPGA configuration memory; MR input enables remote firmware-triggered reset. Use Value: Enables safe reconfiguration under software control without physical access or power interruption. | Use Scenario: Portable gas analyzer with ultra-low-power sleep mode and 4.3V analog front-end supply. IC Role / Device Role / Timing Role: Detects 4.3V rail collapse during battery swap; active-high output directly interfaces to low-threshold reset pin of ARM Cortex-M0+. Use Value: Maintains functional safety integrity by asserting reset before analog subsystem loses regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SXR43D1-T | Same 4.3V threshold and 1ms timeout, but no manual reset input; 3-pin SC70 package | Lacks MR functionality - unsuitable where operator-initiated reset is required | Select when board space is critical and manual reset is handled externally |
| TPS3808G33DBVR | 3.3V threshold (not 4.3V); 20ms min timeout; 6-pin SOT-23; higher 8μA ICC at 1.8V | Designed for 3.3V systems - mismatched threshold invalidates direct substitution in 4.3V monitoring role | Consider only if redesigning for 3.3V rail supervision with longer timeout margin |
Compared with MAX809SXR43D1-T, MAX6385XS43D1-T adds MR capability in a 4-pin package at identical threshold and timeout; versus TPS3808G33DBVR, it delivers exact 4.3V detection with lower quiescent current and smaller footprint-critical for legacy 4.3V supply architectures.
Availability
MAX6385XS43D1-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, dual voltage systems, and intelligent instruments requiring stable component supply with automotive-grade reliability (AEC-Q100 qualified).
Supply support for MAX6385XS43D1-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 solutions.
The MAX6381–MAX6390 family was engineered specifically for single/dual low-voltage microprocessor reset supervision in space- and power-constrained environments, prioritizing accuracy, ultra-low ICC, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6385XS43D1-T and how stable is it over temperature?
The MAX6385XS43D1-T has a factory-set nominal reset threshold of 4.30V, with guaranteed accuracy of ±2.5% over the full operating temperature range of −40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning the threshold drifts less than ±0.3% across the entire range - ensuring consistent 4.3V monitoring in automotive and industrial environments where thermal stress is significant. This stability is confirmed in the device's Electrical Characteristics table and Typical Operating Characteristics plots.
Does the MAX6385XS43D1-T require an external pullup resistor on its RESET output?
No, the MAX6385XS43D1-T does not require an external pullup resistor because it features an active-high push-pull RESET output. Unlike open-drain variants, this output actively drives high during reset assertion and low during deassertion, eliminating dependency on external components. This simplifies design, reduces BOM count, and improves noise immunity - a key advantage confirmed in the Pin Description and Features sections of the datasheet.
What is the function and electrical behavior of the MR pin on the MAX6385XS43D1-T?
The MR (Manual Reset) pin on the MAX6385XS43D1-T is an active-low input that forces a reset when pulled below 0.3×VCC. It includes a 63kΩ internal pullup resistor to VCC, so it can be left unconnected if unused. A logic-low pulse ≥1µs on MR asserts RESET high for the full 1ms timeout period after MR returns high. This enables hardware-initiated resets via switches or logic signals without external debounce circuitry - a feature explicitly documented in the Detailed Description and Electrical Characteristics tables.
Can the MAX6385XS43D1-T operate reliably at VCC = 1.0V, and what happens to the RESET output at that level?
Yes, the MAX6385XS43D1-T is guaranteed to operate and maintain valid logic states down to VCC = 1.0V. At this voltage, the RESET output remains functional: it asserts high during reset and deasserts low when conditions are met, with VOL ≤ 0.3V (ISINK = 80µA) and VOH ≥ 0.8×VCC. This behavior is specified in the Absolute Maximum Ratings and Electrical Characteristics tables and ensures deterministic reset signaling even during severe brownout - critical for fail-safe embedded systems.
Is the MAX6385XS43D1-T pin-compatible with other members of the MAX6381–MAX6390 family, and which packages share the same pinout?
Yes, the MAX6385XS43D1-T shares identical 4-pin SC70 pinout with all other XS-suffix variants in the MAX6381–MAX6390 family (e.g., MAX6384XSxxDx-T, MAX6386XSxxDx-T). Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND - confirmed in the Pin Configurations section and Selector Guide. This allows drop-in replacement within the same package variant when changing reset threshold or timeout, provided the output type (active-high push-pull) and MR functionality match the design requirements.
MAX6385XS43D1-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:
- 4.3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS43D1-T FAQ
1.How can I place an order for MAX6385XS43D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS43D1-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 MAX6385XS43D1-T reliable?
The price and inventory of MAX6385XS43D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS43D1-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS43D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS43D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS43D1-T?
MAX6385XS43D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS43D1-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 MAX6385XS43D1-T?
For technical support, including MAX6385XS43D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS43D1-T requirements.
6.How does Aetrix verify that MAX6385XS43D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS43D1-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 MAX6385XS43D1-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS43D1-T?
All MAX6385XS43D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS43D1-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 MAX6385XS43D1-T part is unused and in its original packaging.
Return procedure for MAX6385XS43D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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