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Analog Devices Inc./Maxim Integrated MAX6421XS48+T
- Part No.:
- MAX6421XS48+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6421XS48+T.pdf
- Description:
- IC MPU/RESET CIRC 4.80V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,010
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Product details
Overview
MAX6421XS48+T from Analog Devices is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-low push-pull reset signal when voltage falls below 4.80 V (±2.5% over temperature). It features capacitor-adjustable reset timeout (3.0–5.75 ms with 1500 pF), guaranteed operation down to VCC = 1 V, and consumes only 1.6 µA typical quiescent current. It is used in battery-powered controllers and portable equipment requiring precise brownout protection.
For engineers reviewing the MAX6421XS48+T datasheet, MAX6421XS48+T pinout, MAX6421XS48+T application, or MAX6421XS48+T equivalent, key selection criteria include its 4.80 V reset threshold accuracy, SC70-4 package footprint, push-pull RESET output drive capability, and immunity to sub-50 µs VCC transients - all critical for reliable µP startup in space-constrained embedded systems.
Technical Context
The MAX6421XS48+T implements a precision voltage detector with laser-trimmed internal resistors to set its 4.80 V reset threshold, maintaining ±2.5% accuracy across –40°C to +125°C. Its reset assertion is triggered by VCC falling below VTH, with a minimum 80 µs response delay.
Reset deassertion uses a 240 nA current source charging an external SRT-to-ground capacitor; the timeout period (tRP = 2.73×10⁶ × CSRT + 275 µs) is fully adjustable and validated over temperature. The device guarantees valid RESET output down to VCC = 1 V, enabling robust operation during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80 V ±2.5% over –40°C to +125°C - ensures consistent brownout detection across automotive/industrial temperature ranges |
| Quiescent Current | 1.6 µA typical at VCC ≤ 2.0 V - enables multi-year battery life in always-on portable monitoring systems |
| Reset Timeout Range | 275 µs (CSRT = 0) to 5.75 ms (CSRT = 1500 pF) - supports µP reset timing requirements from fast-boot MCUs to legacy processors |
| RESET Output Type | Active-low push-pull - drives µP reset input directly without external pullup, simplifying BOM and layout |
| VCC Operating Range | 1.0 V to 5.5 V - allows use with 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains |
| Immunity to VCC Transients | No reset issued for 100 mV overdrive transients ≤ 50 µs - prevents false resets during switching noise or ESD events |
| Guaranteed Valid RESET | Valid down to VCC = 1.0 V - maintains deterministic reset state even during severe undervoltage conditions |
Pinout & Package
MAX6421XS48+T is housed in a 4-pin SC70-4 package (package code X4+1, outline 21-0098), measuring 2.0 mm × 2.1 mm × 0.9 mm, suitable for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal circuitry and SRT ramp current; must be low-impedance connection to system ground plane |
| 2 - VCC | Supply and threshold monitor input | Monitored voltage rail; powers internal circuitry and sets reset detection point; operates from 1.0 V to 5.5 V |
| 3 - RESET | Active-low push-pull reset output | Drives µP reset pin low during fault; sinks up to 3.2 mA at VCC ≥ 4.5 V; no external pullup required |
| 4 - SRT | Set Reset Timeout input | Connects to external capacitor (CSRT); 240 nA internal current source charges CSRT to generate programmable timeout delay |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise timing tuning (275 µs to >5 ms) via single external capacitor - eliminates need for fixed-timing supervisors or firmware delays |
| Laser-trimmed reset threshold | 4.80 V threshold with ±2.5% tolerance over full temperature range - removes calibration step in production test and improves system reliability |
| Ultra-low quiescent current | 1.6 µA typical at 2.0 V - reduces standby power in battery-backed systems by >50% vs. comparable supervisors |
| Push-pull RESET output | Eliminates external pullup resistor and associated leakage paths - saves board area and improves noise immunity in high-impedance reset lines |
| VCC = 1 V operation guarantee | Ensures deterministic reset behavior during deep brownout - prevents µP lockup or undefined execution when supply collapses |
Applications
| Portable Medical Monitors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Wearable ECG device powered by coin-cell battery, requiring reliable reset during voltage sag caused by RF transmission bursts. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET when VCC drops below 4.80 V during 3.3 V rail collapse; timeout set to 4.375 ms to exceed µP's minimum reset pulse width. Use Value: Prevents corrupted sensor data logging by ensuring µP remains held in reset until stable 3.3 V rail is restored - enabled by 1.6 µA ICC and VCC = 1 V validity. |
Use Scenario: Remote PLC node operating on Li-ion battery, exposed to wide temperature swings (-40°C to +85°C) and conducted EMI. IC Role / Device Role / Timing Role: Brownout detector monitoring 3.3 V I/O rail; asserts push-pull RESET to ARM Cortex-M4 during undervoltage; immune to 40 µs transients. Use Value: Eliminates spurious reboots from motor-drive noise due to 50 µs transient immunity and ±2.5% threshold stability - verified across full industrial temperature range. |
| Automotive Body Control Modules | Smart Home Sensor Hubs |
Use Scenario: Door module powered from vehicle 5 V bus, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises 5 V supply; triggers 5.75 ms reset pulse (CSRT = 1500 pF) to ensure complete µP initialization after cold-crank recovery. Use Value: Guarantees safe state entry after battery voltage dip to 3.2 V - supported by 4.80 V threshold accuracy and operation down to VCC = 1 V. |
Use Scenario: Zigbee-enabled temperature/humidity hub using AAA batteries, requiring multi-year shelf life and instant wake-on-event. IC Role / Device Role / Timing Role: Low-power supervisor monitoring 1.8 V LDO output; asserts RESET on 1.8 V rail collapse; timeout set to 275 µs for fast wake-up. Use Value: Achieves <1 µA average system standby current - enabled by 1.6 µA ICC and SC70-4 footprint minimizing parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6424UK48+T | Same 4.80 V threshold and push-pull output, but in 5-pin SOT23-5 package with N.C. pin instead of SC70-4 pinout | Requires PCB redesign due to different footprint and pin assignment; offers identical electrical performance | Select when SOT23-5 layout already exists or when N.C. pin provides routing flexibility |
| NCP302HS48T1G | 4.8 V threshold, open-drain RESET, 1.5 µA ICC, but lacks capacitor-adjustable timeout (fixed 200 ms) | Suitable for basic reset needs but cannot meet µP-specific timeout requirements <5 ms | Choose only if fixed timeout suffices and open-drain interface is acceptable for the target µP |
Compared with MAX6421XS48+T, MAX6424UK48+T delivers identical supervision functionality in a larger package requiring layout change, while NCP302HS48T1G trades timeout flexibility for lower cost and slightly lower ICC - making MAX6421XS48+T optimal where programmable delay and minimal footprint are mandatory.
Availability
MAX6421XS48+T is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered industrial controllers, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6421XS48+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX6421XS48+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power µP supervisors, designed specifically for space-constrained, battery-sensitive applications demanding precise, adjustable reset timing and wide-temperature reliability.
FAQ
What is the exact reset threshold voltage of the MAX6421XS48+T?
The MAX6421XS48+T has a nominal reset threshold of 4.80 V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating temperature range. This value is laser-trimmed at wafer sort and confirmed in the Electrical Characteristics table under "VCC Reset Threshold Accuracy".
Does the MAX6421XS48+T require an external pullup resistor on the RESET pin?
No, the MAX6421XS48+T features an active-low push-pull RESET output, meaning it actively drives both high and low states. Unlike open-drain variants, it does not require an external pullup resistor - simplifying design and reducing component count in systems using this specific variant.
How is the reset timeout period set for the MAX6421XS48+T?
The reset timeout period for MAX6421XS48+T is set by connecting an external capacitor (CSRT) between the SRT pin and GND. The relationship is tRP = 2.73 × 10⁶ × CSRT + 275 µs, where tRP is in seconds and CSRT in farads. A 1500 pF capacitor yields 3.0–5.75 ms timeout, verified across temperature.
Can the MAX6421XS48+T operate reliably at VCC = 1.2 V?
Yes, the MAX6421XS48+T is guaranteed to provide valid RESET output down to VCC = 1.0 V, including at 1.2 V. Its internal circuitry remains functional, and RESET assertion/deassertion behavior is fully specified at this level - critical for brownout recovery in low-voltage systems.
What package type and dimensions does the MAX6421XS48+T use?
The MAX6421XS48+T uses a 4-pin SC70-4 package (Analog Devices code X4+1, outline 21-0098), measuring 2.0 mm × 2.1 mm × 0.9 mm. It is lead(Pb)-free, tape-and-reel packaged, and compatible with standard SC70 reflow profiles per JEDEC J-STD-020.
MAX6421XS48+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6421XS48+T FAQ
1.How can I place an order for MAX6421XS48+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6421XS48+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 MAX6421XS48+T reliable?
The price and inventory of MAX6421XS48+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6421XS48+T is usually 5 days.
3.What payment methods are accepted for MAX6421XS48+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6421XS48+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6421XS48+T?
MAX6421XS48+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6421XS48+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 MAX6421XS48+T?
For technical support, including MAX6421XS48+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6421XS48+T requirements.
6.How does Aetrix verify that MAX6421XS48+T is sourced from the original manufacturer or authorized distributors?
All MAX6421XS48+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 MAX6421XS48+T meets industry standards.
7.What is the process for return or replacement of MAX6421XS48+T?
All MAX6421XS48+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6421XS48+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 MAX6421XS48+T part is unused and in its original packaging.
Return procedure for MAX6421XS48+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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