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Analog Devices Inc./Maxim Integrated MAX6422US29+T
- Part No.:
- MAX6422US29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,039
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Product details
Overview
MAX6422US29+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 2.925V (typ), holds 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 where deterministic power-up sequencing is critical.
For engineers reviewing the MAX6422US29+T datasheet, MAX6422US29+T pinout, MAX6422US29+T application, or MAX6422US29+T equivalent, key selection criteria include its 2.925V reset threshold accuracy (±2.5% over temperature), 1.6µA quiescent current, SC70-4 package footprint, and active-high push-pull drive capability compatible with 1.8V–5V µP reset inputs.
Technical Context
The MAX6422US29+T implements a precision bandgap-based voltage detector with laser-trimmed resistors to set its nominal 2.925V reset threshold. Its internal 240nA current source charges an external SRT capacitor to generate a programmable reset timeout via ramp-to-reference comparison against a stable 0.65V threshold.
Unlike open-drain variants, the MAX6422US29+T features a push-pull output stage capable of sourcing up to 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC - eliminating need for external pull-ups and enabling direct interface to CMOS reset inputs across wide supply ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (typ), ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Quiescent Current | 1.6µA (typ) at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered IoT sensors |
| Reset Timeout Range | 275µs to >10ms (capacitor-adjustable) - supports µP reset timing requirements from fast-boot MCUs to legacy processors |
| Output Type | Active-high push-pull - drives RESET line directly without pull-up resistor, reducing BOM count and layout area |
| Supply Voltage Range | 1.0V to 5.5V - operates during deep brownout and interfaces with 1.2V–5V logic domains |
| VCC to RESET Delay | 80µs (max) - provides fast response to supply collapse, preventing erroneous code execution |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control applications |
Pinout & Package
MAX6422US29+T is housed in a 4-pin SC70 package (package code X4+1, outline 21-0098), measuring 1.25mm × 1.25mm × 0.9mm with 0.65mm pitch. This ultra-compact footprint supports high-density PCB layouts in space-constrained portable and wearable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and reset threshold monitor node - must be decoupled locally to ensure noise immunity |
| 2 | GND | Analog ground reference for internal comparator and current source - requires low-impedance connection to system ground plane |
| 3 | RESET | Active-high push-pull reset output - sinks up to 3.2mA at VCC ≥ 4.5V and sources up to 800µA, directly driving µP reset pins |
| 4 | SRT | Set-reset-time input - connects to external timing capacitor; trace must be short and isolated from digital noise to maintain timeout accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise timing tuning (275µs–10ms+) using a single external capacitor - eliminates need for multiple fixed-timing parts |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion even during severe brownout conditions before system power rail collapses completely |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - prevents spurious resets in noisy power environments |
| Laser-trimmed reset threshold | Delivers ±1.5% accuracy at +25°C and ±2.5% over full temperature range - reduces calibration overhead in production test |
| Ultra-low quiescent current | 1.6µA typical at 2.0V supply - extends battery life in always-on monitoring applications without compromising supervision integrity |
Applications
| Battery-Powered Portable Equipment | Automotive Body Control Module |
|---|---|
|
Use Scenario: Smart thermostat powered by two AA alkaline cells with dynamic load switching causing supply droop during RF transmission. IC Role / Device Role / Timing Role: Monitors VCC and asserts active-high RESET to halt MCU execution until voltage recovers above 2.925V, then enforces 4.375ms hold time for safe reinitialization. Use Value: Prevents firmware corruption during intermittent power dips, eliminating field failures caused by partial memory writes or register misconfiguration. |
Use Scenario: Door module MCU subjected to load dump and cold-crank transients in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Detects VCC collapse below 2.925V during cranking and maintains RESET high for ≥275µs after recovery - ensuring MCU remains held until stabilized 5V LDO output is valid. Use Value: Guarantees robust startup after engine restart without requiring external RC timing networks or complex watchdog coordination. |
| Medical Wearable Sensor Hub | Industrial PLC I/O Subsystem |
|
Use Scenario: ECG patch with ultra-low-power ARM Cortex-M0+ MCU operating from regulated 1.8V rail derived from coin cell. IC Role / Device Role / Timing Role: Supervises 1.8V supply using internal threshold scaling; asserts RESET if voltage sags below 2.925V × (1.8V/5V) effective level - validated to VCC = 1V. Use Value: Maintains fail-safe behavior during battery depletion, forcing controlled shutdown before analog front-end biasing fails and corrupting clinical data. |
Use Scenario: DIN-rail mounted controller with isolated 3.3V digital supply powering FPGA configuration logic and communication peripherals. IC Role / Device Role / Timing Role: Provides independent reset supervision for FPGA domain, with SRT capacitor selected to match FPGA's minimum TPROG requirement (e.g., 5ms). Use Value: Decouples reset timing from main system supervisor, enabling staged power-up sequences and avoiding race conditions during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US29+T | Active-low push-pull output; identical threshold, timing, and package | Requires inverted reset logic on µP side or external inverter; unsuitable for µPs with active-high-only reset inputs | Select when host MCU accepts active-low reset and board layout already uses pull-down strategy |
| TLV809E29DBZR | Fixed 2.93V threshold, 200ms factory-fixed timeout, SOT-23-3 package, no SRT pin | Lacks adjustable timeout; smaller footprint but no timing flexibility; lower max operating temperature (+85°C) | Choose for cost-sensitive, space-constrained designs where fixed 200ms delay suffices and extended temp range is not required |
Compared with MAX6421US29+T, the MAX6422US29+T eliminates need for logic inversion; compared with TLV809E29DBZR, it trades fixed timing simplicity for field-programmable delay and extended temperature support - making it optimal for automotive and industrial applications demanding both precision and configurability.
Availability
MAX6422US29+T is available at Aetrix Electronics and suitable for battery-powered portable equipment, automotive body electronics, and medical wearables requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6422US29+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 since 1965.
The MAX6422US29+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power reset supervisors, engineered specifically for reliable power-monitoring in energy-constrained and thermally harsh environments.
FAQ
What is the exact reset threshold voltage of the MAX6422US29+T?
The MAX6422US29+T has a nominal reset threshold of 2.925V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed at wafer sort and confirmed in the Electrical Characteristics table of the official datasheet (Rev 11, p.2).
Can the MAX6422US29+T operate with a 1.2V supply rail?
No - the MAX6422US29+T requires VCC between 1.0V and 5.5V to function, but its internal voltage reference and comparator are optimized for accurate threshold detection only when VCC ≥ 1.6V. At 1.2V, the device may power up but cannot guarantee correct reset assertion per specification.
How do I calculate the SRT capacitor value for a 10ms reset timeout using the MAX6422US29+T?
Use the formula CSRT = (tRP − 275µs) / 2.735 × 10⁶, where tRP is in seconds. For 10ms: CSRT = (0.01 − 0.000275) / 2,735,000 ≈ 3.55nF. Select a low-leakage ceramic capacitor (X7R/C0G, <10nA leakage) placed close to the SRT pin per layout guidelines in the datasheet (p.5).
Is the MAX6422US29+T pin-compatible with other parts in the MAX642x family?
Yes - the MAX6422US29+T shares identical 4-pin SC70 pinout with MAX6421US29+T and MAX6423US29+T. However, output polarity differs: MAX6422US29+T is active-high push-pull, MAX6421US29+T is active-low push-pull, and MAX6423US29+T is open-drain - requiring schematic and firmware review before substitution.
Does the MAX6422US29+T meet AEC-Q100 automotive qualification standards?
No - AEC-Q100 qualification is explicitly documented only for the MAX6340UK31/V+T variant (per datasheet p.1). The MAX6422US29+T is rated for -40°C to +125°C operation and widely used in automotive applications, but it does not carry formal AEC-Q100 certification. For Q100-requiring designs, consider the MAX6340UK29+T as an open-drain alternative.
MAX6422US29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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:
- SOT-143-4
MAX6422US29+T FAQ
1.How can I place an order for MAX6422US29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US29+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 MAX6422US29+T reliable?
The price and inventory of MAX6422US29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US29+T is usually 5 days.
3.What payment methods are accepted for MAX6422US29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US29+T?
MAX6422US29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US29+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 MAX6422US29+T?
For technical support, including MAX6422US29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US29+T requirements.
6.How does Aetrix verify that MAX6422US29+T is sourced from the original manufacturer or authorized distributors?
All MAX6422US29+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 MAX6422US29+T meets industry standards.
7.What is the process for return or replacement of MAX6422US29+T?
All MAX6422US29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US29+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 MAX6422US29+T part is unused and in its original packaging.
Return procedure for MAX6422US29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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