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Analog Devices Inc./Maxim Integrated MAX6422XS44+T
- Part No.:
- MAX6422XS44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6422XS44+T.pdf
- Description:
- IC MPU/RESET CIRC 4.375V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,084
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Product details
Overview
MAX6422XS44+T from Analog Devices is a low-power, active-high push-pull microprocessor reset supervisor IC designed for precise VCC monitoring in embedded systems. It asserts a high-level RESET signal when supply voltage falls below 4.375V (typ), maintains it for a capacitor-adjustable timeout (e.g., 4.375ms with 1500pF), and guarantees valid output down to VCC = 1V. Used in battery-powered controllers and portable equipment requiring reliable power-on reset.
For engineers reviewing the MAX6422XS44+T datasheet, MAX6422XS44+T pinout, MAX6422XS44+T application, or MAX6422XS44+T equivalent, key selection criteria include its 4-pin SC70 package, 1.6µA quiescent current, ±2.5% reset threshold accuracy over –40°C to +125°C, and compatibility with µP reset inputs requiring active-high assertion.
Technical Context
The MAX6422XS44+T implements a precision voltage detector with laser-trimmed internal reference and a 240nA SRT ramp current source that charges an external capacitor to set reset timeout. Its active-high push-pull output drives directly into CMOS µP reset inputs without pull-up resistors.
It operates across 1.0V–5.5V supply range, features guaranteed reset validity down to VCC = 1V, and rejects short VCC transients (e.g., ≤50µs for 100mV overdrive). The device uses BiCMOS process and achieves ±2.5% threshold tolerance over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.266V (min) / 4.375V (typ) / 4.484V (max) - sets precise brownout detection point for 4.375V nominal systems |
| Supply Current | 1.6µA (typ at VCC ≤ 2.0V) - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout Period | 4.375ms (typ with CSRT = 1500pF) - ensures µP completes internal initialization before release |
| Operating Temperature | –40°C to +125°C - supports automotive under-hood and industrial control environments |
| Output Type | Active-high push-pull - eliminates need for external pull-up resistor; sinks/supplies ≥500µA |
| VCC to Reset Delay | 80µs (max) - provides fast response to supply collapse during brownout |
| Hysteresis | 4 × VTH (≈17.5mV at 4.375V) - prevents oscillation near threshold during slow VCC transitions |
Pinout & Package
MAX6422XS44+T is housed in a 4-pin SC70 package (package code X4+1, outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal circuitry and SRT ramp current; must connect to system ground plane |
| 2 - VCC | Supply and threshold monitor input | Monitored voltage rail; device operates and asserts reset based on this pin's potential |
| 3 - RESET | Active-high push-pull reset output | Drives µP reset pin high during fault; sinks 500µA @ VCC ≥ 2.7V, sources 200µA @ VCC ≥ 1.8V |
| 4 - SRT | Set Reset Timeout input | Connects to external capacitor (CSRT); 240nA current source charges it to 0.65V to define timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Timeout programmable from 275µs to >10ms via external CSRT (0–10nF), enabling µP-specific timing alignment |
| Guaranteed reset validity to VCC = 1V | RESET remains functional and logic-valid even as supply collapses, preventing undetermined µP states |
| Low quiescent current (1.6µA typ) | Minimizes battery drain in always-on monitoring applications such as medical wearables and remote sensors |
| ±2.5% reset threshold accuracy over temperature | Ensures consistent brownout detection across –40°C to +125°C without calibration |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration at 100mV overdrive, avoiding false resets in noisy power environments |
Applications
| Portable Medical Monitors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output; asserts active-high RESET until stable voltage and timeout elapse. Use Value: Prevents firmware execution during weak-battery brownout, extending usable battery life by eliminating spurious reboots. |
Use Scenario: Remote PLC I/O module operating in unregulated 12V vehicle power with wide temperature swings. IC Role / Device Role / Timing Role: Monitors 5V system rail derived from buck converter; provides 4.375V threshold and 4.375ms timeout aligned to µP boot sequence. Use Value: Ensures deterministic startup after engine cranking dips, meeting ISO 16750-2 transient immunity requirements. |
| Automotive Infotainment Head Units | Smart Energy Metering Modules |
Use Scenario: Dual-core ARM-based head unit with separate 1.2V core and 3.3V I/O rails, powered from vehicle battery. IC Role / Device Role / Timing Role: Resets application processor on 3.3V rail collapse; leverages active-high output to interface directly with AP reset pin. Use Value: Eliminates external level-shifting components, reducing BOM count and layout area in AEC-Q200–aligned designs. |
Use Scenario: DIN-rail mounted electricity meter with tamper-detection circuitry and backup supercapacitor. IC Role / Device Role / Timing Role: Monitors primary 3.3V supply; triggers controlled shutdown and nonvolatile state save before VCC drops below 1V. Use Value: Guarantees valid RESET assertion down to VCC = 1V, enabling safe EEPROM write completion during power failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6422US44+T | SOT143-4 package (vs. SC70); identical electrical specs and pinout mapping | Larger footprint (2.9mm × 2.8mm) but higher thermal mass; preferred for manual assembly or high-reliability solder joints | Select when board layout allows larger package or requires enhanced thermal performance at cost of area |
| TLV803S43DBZR | Fixed 4.3V threshold (vs. 4.375V); 1.8µA ICC (vs. 1.6µA); open-drain output (requires pull-up) | Lacks capacitor-adjustable timeout; reset period fixed at 200ms; not suitable for µPs needing custom delay | Choose only if fixed delay and lower cost outweigh need for timing flexibility and active-high drive |
Compared with MAX6422XS44+T, MAX6422US44+T offers identical functionality in a mechanically distinct package, while TLV803S43DBZR trades adjustable timing and push-pull drive for lower unit cost and fixed behavior-making it unsuitable for designs requiring precise timeout tuning or direct µP interface.
Availability
MAX6422XS44+T is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered industrial controllers, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6422XS44+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 MAX6421–MAX6426 family delivers ultra-low-power, precision reset supervision for space- and energy-constrained embedded systems, emphasizing accuracy, temperature stability, and flexible timeout configuration.
FAQ
What is the exact reset threshold voltage of the MAX6422XS44+T?
The MAX6422XS44+T has a factory-trimmed reset threshold of 4.375V (typical), with minimum 4.266V and maximum 4.484V across –40°C to +125°C. This value is laser-trimmed and specified in Table 1 of the datasheet under suffix "44", ensuring tight tolerance without external calibration.
How do I calculate the reset timeout capacitor for the MAX6422XS44+T?
Use the formula CSRT = (tRP – 275µs) / 2.735 × 10⁶, where tRP is desired timeout in seconds and CSRT is in farads. For example, a 4.375ms timeout requires CSRT = (0.004375 – 0.000275) / 2.735e6 ≈ 1500pF. Ceramic capacitors with leakage <10nA are recommended.
Can the MAX6422XS44+T operate reliably at VCC = 1.2V?
Yes - the MAX6422XS44+T guarantees valid RESET output down to VCC = 1V. At 1.2V, it maintains full reset assertion capability, including VOL ≤ 0.3V (ISINK = 500µA) and VOH ≥ 0.8 × VCC, ensuring robust interface with low-voltage µPs.
Is the MAX6422XS44+T pin-compatible with other members of the MAX642x family?
Yes - MAX6422XS44+T shares identical 4-pin SC70 pinout with MAX6421XSxx+T and MAX6423XSxx+T. Pin 1 = GND, Pin 2 = VCC, Pin 3 = RESET, Pin 4 = SRT. Functionally, only the reset polarity (active-high) and threshold differ; no PCB change is needed when swapping within same package type.
Does the MAX6422XS44+T require an external pull-up resistor on the RESET pin?
No - the MAX6422XS44+T features an active-high push-pull RESET output, which actively drives high and low without external components. Unlike open-drain variants (e.g., MAX6423), it sources up to 800µA and sinks up to 3.2mA, enabling direct connection to µP reset inputs.
MAX6422XS44+T 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.375V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6422XS44+T FAQ
1.How can I place an order for MAX6422XS44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422XS44+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 MAX6422XS44+T reliable?
The price and inventory of MAX6422XS44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422XS44+T is usually 5 days.
3.What payment methods are accepted for MAX6422XS44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422XS44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422XS44+T?
MAX6422XS44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422XS44+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 MAX6422XS44+T?
For technical support, including MAX6422XS44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422XS44+T requirements.
6.How does Aetrix verify that MAX6422XS44+T is sourced from the original manufacturer or authorized distributors?
All MAX6422XS44+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 MAX6422XS44+T meets industry standards.
7.What is the process for return or replacement of MAX6422XS44+T?
All MAX6422XS44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422XS44+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 MAX6422XS44+T part is unused and in its original packaging.
Return procedure for MAX6422XS44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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