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Analog Devices Inc./Maxim Integrated MAX6422US29+
- Part No.:
- MAX6422US29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US29+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:278
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Product details
Overview
MAX6422US29+ from Maxim Integrated is a low-power microprocessor supervisor IC with active-high push-pull reset output, 2.925V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors supply voltages from 1.6V to 5.5V and is used in battery-powered controllers to prevent code execution errors during brownout.
For engineers reviewing the MAX6422US29+ datasheet, MAX6422US29+ pinout, MAX6422US29+ application, or MAX6422US29+ equivalent, key selection criteria include reset threshold accuracy, active-high push-pull drive capability, ultra-low quiescent current (1.6µA typ), SOT143-4 package compatibility, and immunity to short VCC transients.
Technical Context
The MAX6422US29+ implements a precision voltage detector with laser-trimmed internal resistors to set its 2.925V reset threshold, featuring ±2.5% accuracy across –40°C to +125°C. Its reset timeout is controlled by an internal 240nA current source charging an external capacitor on the SRT pin, with deassertion triggered at 0.65V ramp voltage.
This device uses BiCMOS process technology and guarantees valid RESET output for VCC ≥ 1V. Unlike open-drain variants, the active-high push-pull output drives high to 0.8×VCC (min) with 200µA source current, eliminating need for external pull-up resistors in most µP reset interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in portable medical or sensor nodes |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0 to 1500pF) - supports wide µP reset timing requirements without fixed-delay constraints |
| VCC Operating Range | 1.0V to 5.5V - allows use with Li-ion, coin-cell, and 3.3V/5V logic supplies without external regulation |
| RESET Output Type | Active-high push-pull - directly interfaces to µP reset inputs requiring asserted-high logic without pull-up components |
| VCC to RESET Delay | 80µs max at 1mV/µs VCC fall rate - provides fast response to supply collapse while rejecting sub-80µs glitches |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial embedded controller environments |
Pinout & Package
MAX6422US29+ is housed in a 4-pin SOT143-4 package (package code U4+1), measuring 2.1mm × 2.3mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply voltage input and reset threshold monitoring node - must be decoupled locally; valid operation starts at 1.0V |
| 2 | GND | Analog ground reference for internal comparator and ramp circuit - 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; sources 200µA minimum at VCC ≥ 1.8V |
| 4 | SRT | Set-reset-time input - connects to external timing capacitor; sensitive to leakage and stray capacitance; trace must be short and isolated |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset pulse width (275µs–5.75ms) to match specific µP requirements without firmware changes |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion even during deep brownout, preventing undefined µP state when supply collapses below 1.6V |
| Immunity to short VCC transients | Rejects negative-going glitches ≤ 50µs duration when VCC drops 100mV below threshold - reduces false resets in noisy power systems |
| Low-leakage SRT ramp current | 240nA ±15% current source enables stable timeout setting with standard ceramic capacitors (no special low-leakage types required) |
| Laser-trimmed threshold accuracy | ±1.5% at +25°C and ±2.5% over full temperature range - eliminates need for external calibration in cost-sensitive applications |
Applications
| Portable Medical Sensors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell operating intermittently over multi-year lifespan. IC Role / Device Role / Timing Role: Supervises VCC during wake-up cycles; asserts active-high RESET until supply stabilizes above 2.925V and holds for 4.375ms (CSRT = 1500pF). Use Value: Prevents corrupted ADC sampling or BLE transmission startup by ensuring µP only exits reset after stable rail and sufficient timeout for LDO settling. |
Use Scenario: Remote RTU in oil-field telemetry system using Li-SOCl₂ primary battery with wide temperature exposure (–40°C to +85°C). IC Role / Device Role / Timing Role: Monitors 3.3V system rail; triggers active-high RESET on brownout and maintains assertion for 3.0ms to cover µP internal clock stabilization. Use Value: Eliminates need for external pull-up resistor, reducing BOM count and PCB area in space-constrained enclosures while maintaining AEC-Q100-equivalent reliability. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Door module MCU powered from vehicle battery (9V–16V) via local 3.3V LDO, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Detects VCC drop below 2.925V during cranking; asserts RESET for min. 275µs (CSRT = 0) to meet ISO 16750-2 pulse immunity requirements. Use Value: Push-pull output drives µP reset pin directly without level-shifting, avoiding timing skew between power rail collapse and reset assertion. |
Use Scenario: Revenue-grade meter with dual-supply architecture (main AC-derived 3.3V + backup supercapacitor 2.5V) requiring fail-safe reset coordination. IC Role / Device Role / Timing Role: Supervises backup rail; generates active-high RESET pulse upon supercapacitor discharge below 2.925V, synchronized with main µP watchdog timeout. Use Value: Capacitor-adjustable timeout allows precise alignment with supercapacitor discharge curve, preventing premature reset or delayed fault response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US29+ | Active-low push-pull RESET output; identical threshold, timeout, and quiescent current specs | Requires µP with active-low reset input; incompatible with active-high-only reset pins | Select MAX6421US29+ only when target µP mandates active-low assertion and board layout accommodates inverted logic path |
| TLV803EB29DBZR | Fixed 2.93V threshold, 200ms min reset timeout, 0.5µA IQ, SOT23-3 package - no adjustable timeout or SRT pin | Lacks capacitor-programmable delay; limited to applications where fixed 200ms+ timeout is acceptable | Choose TLV803EB29DBZR only for cost-sensitive, space-constrained designs where timeout flexibility is unnecessary and 200ms+ reset hold is sufficient |
Compared with MAX6421US29+, the MAX6422US29+ provides active-high reset polarity essential for modern ARM Cortex-M MCUs with non-inverting reset inputs; compared with TLV803EB29DBZR, it offers 20× finer timeout resolution (down to 275µs) and design adaptability across µP families with varying reset timing requirements.
Availability
MAX6422US29+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6422US29+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for resource-constrained embedded systems where supply stability and deterministic boot behavior are critical.
FAQ
What is the exact reset threshold voltage of MAX6422US29+ and how does it vary with temperature?
The MAX6422US29+ has a nominal reset threshold of 2.925V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This is confirmed by Table 1 (suffix "29") and Electrical Characteristics section, where VTH min/max values are explicitly listed as 2.852V and 2.998V respectively at temperature extremes.
Can MAX6422US29+ operate reliably when VCC drops below 1.6V?
Yes - the MAX6422US29+ guarantees valid RESET output down to VCC = 1.0V, as stated in both the General Description and Absolute Maximum Ratings sections. Its internal circuitry remains functional and asserts RESET correctly even during deep brownout conditions below typical 1.6V minimums.
What package type and footprint does MAX6422US29+ use, and is it RoHS-compliant?
MAX6422US29+ uses the 4-pin SOT143-4 package (outline 21-0052), with land pattern 90-0183. The "+" suffix confirms it is lead(Pb)-free and RoHS-compliant, as documented in the Package Information and Ordering Information sections of the datasheet.
How is the reset timeout period set on MAX6422US29+, and what capacitor value yields a 4.375ms delay?
The reset timeout is set by connecting a capacitor (CSRT) between the SRT pin and GND. For a 4.375ms delay, CSRT = 1500pF is specified in the Electrical Characteristics table under tRP conditions. The formula tRP = 2.73×10⁶ × CSRT + 275µs confirms this value yields exactly 4.375ms.
Does MAX6422US29+ require an external pull-up resistor on its RESET pin?
No - MAX6422US29+ features an active-high push-pull RESET output, which actively drives high to 0.8×VCC and low to <0.4V. Unlike open-drain variants (e.g., MAX6423US29+), it requires no external pull-up resistor, simplifying schematic design and reducing component count.
MAX6422US29+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- 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+ FAQ
1.How can I place an order for MAX6422US29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US29+ 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+ reliable?
The price and inventory of MAX6422US29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US29+ is usually 5 days.
3.What payment methods are accepted for MAX6422US29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US29+?
MAX6422US29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US29+ 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+?
For technical support, including MAX6422US29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US29+ requirements.
6.How does Aetrix verify that MAX6422US29+ is sourced from the original manufacturer or authorized distributors?
All MAX6422US29+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6422US29+?
All MAX6422US29+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US29+, 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+ part is unused and in its original packaging.
Return procedure for MAX6422US29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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