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Analog Devices Inc./Maxim Integrated MAX6422XS44+
- Part No.:
- MAX6422XS44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6422XS44+.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, AD
- Quantity:
- Payment:
- Shipping:
Inventory:1,355
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Product details
Overview
MAX6422XS44+ from Maxim Integrated is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-high push-pull RESET signal when voltage falls below 4.375V (factory-trimmed threshold). It features capacitor-adjustable reset timeout (275µs base + 2.73s/F × CSRT), guaranteed operation down to VCC = 1V, and consumes only 1.6µA typical quiescent current. It is used in battery-powered embedded controllers to prevent code-execution errors during power-up, brownout, or transient conditions.
For engineers reviewing the MAX6422XS44+ datasheet, MAX6422XS44+ pinout, MAX6422XS44+ application, or MAX6422XS44+ equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts for voltage-monitoring reset circuits in portable and automotive systems.
Technical Context
The MAX6422XS44+ implements a precision bandgap-based voltage detector with ±1.5% threshold accuracy at +25°C and ±2.5% over –40°C to +125°C. Its reset timeout is generated by a 240nA internal current source charging an external capacitor (CSRT) to a 0.65V ramp threshold, enabling programmable delays from 275µs to >100ms.
It uses a push-pull output stage capable of sourcing ≥800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC, and sinking ≥3.2mA with VOL ≤ 0.4V - ensuring robust logic-level compatibility with modern µP reset inputs without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.375V ±2.5% over full temperature range - ensures reliable brownout detection for 4.5V nominal supplies |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Base | 275µs minimum - guarantees sufficient deassertion hold time even with zero external capacitor |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion down to ultra-low VCC, critical for graceful shutdown |
| Output Type | Active-high push-pull - eliminates need for external pull-up resistor and simplifies PCB layout |
| Reset Propagation Delay | 80µs max (VCC falling at 1mV/µs) - provides fast response to supply collapse without false triggering |
| Hysteresis | 4×VTH = 17.5mV - prevents oscillation near threshold during slow-rising/falling VCC transitions |
Pinout & Package
MAX6422XS44+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input - connects to external timing capacitor; 240nA ramp current charges CSRT to 0.65V to define timeout period |
| 2 | GND | Ground reference - must be low-impedance return path for internal current sources and reset logic |
| 3 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks up to 3.2mA, sources up to 800µA |
| 4 | VCC | Supply and monitored voltage input - powers device and serves as the monitored rail; reset asserted when VCC < 4.375V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (275µs to >100ms) via single external capacitor - avoids fixed-delay limitations |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout or battery depletion - prevents undefined µP states |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - eliminates spurious resets in noisy environments |
| Low-leakage SRT pin design | Minimizes timing error from board leakage or stray capacitance - enables accurate timeout with ceramic capacitors |
| Laser-trimmed reset threshold | Delivers 4.375V with ±2.5% tolerance across –40°C to +125°C - eliminates need for external calibration or trimming |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Wearable ECG monitor operating from coin-cell battery with gradual voltage decay during discharge cycle. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high RESET to ARM Cortex-M0+ MCU upon crossing 4.375V threshold during brownout. Use Value: Prevents corrupted memory writes and firmware lockup by guaranteeing clean restart before supply collapses below µP operational minimum. |
Use Scenario: Door module powered from vehicle battery subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: Monitors 5V LDO output feeding microcontroller; holds RESET active during <50µs negative transients. Use Value: Maintains system integrity during engine start by rejecting cranking-induced dips while asserting reset on sustained undervoltage. |
| Industrial Handheld Terminals | Smart Energy Meters |
Use Scenario: Ruggedized barcode scanner using Li-ion battery with protection circuit causing abrupt VCC drop at end-of-life. IC Role / Device Role / Timing Role: Generates 50ms reset pulse via 15nF SRT capacitor to ensure full µP initialization after power recovery. Use Value: Eliminates boot failures caused by marginal VCC recovery by enforcing minimum reset assertion time independent of supply slew rate. |
Use Scenario: Electricity meter with isolated power supply where main rail may sag during surge events. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller supply; asserts RESET if VCC drops below 4.375V (monitored via resistive divider). Use Value: Enables safe nonvolatile memory write abort and secure state save before power loss - meeting IEC 62053-21 data retention requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6422US44+ | Same electrical specs and reset function, but in 4-pin SOT143 package (2.9mm × 1.5mm) | SOT143 offers slightly larger pad area and higher thermal mass; SC70 preferred for ultra-dense layouts | Select MAX6422US44+ only if SOT143 footprint is already standardized in your design - no electrical trade-offs. |
| TLV803SDBZR | Fixed 4.38V threshold, 200ms factory-fixed timeout, 0.5µA IQ, SOT23-3 package | Lacks adjustable timeout and operates down to only 0.9V VCC; no SRT pin or capacitor interface | Choose TLV803SDBZR only when timeout flexibility is unnecessary and ultra-low IQ (<1µA) is prioritized over programmability. |
Compared with MAX6422XS44+, MAX6422US44+ offers identical functionality in a different 4-pin package, while TLV803SDBZR trades timeout adjustability and VCC-range robustness for lower quiescent current and smaller 3-pin footprint - making each suitable for distinct design constraints.
Availability
MAX6422XS44+ is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6422XS44+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX6422XS44+ belongs to Maxim's µP supervisor product line, designed specifically to provide reliable, low-power reset supervision for microcontrollers in harsh or energy-constrained environments.
FAQ
What is the exact reset threshold voltage of the MAX6422XS44+?
The MAX6422XS44+ has a factory-laser-trimmed reset threshold of 4.375V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 of the datasheet under suffix "44", and applies specifically to the MAX6422XS44+ variant - not the broader MAX6422 family.
Does the MAX6422XS44+ require an external pull-up resistor on the RESET pin?
No, the MAX6422XS44+ features an active-high push-pull RESET output, so it actively drives both high and low states without needing an external pull-up. This is explicitly stated in the General Description and Pin Description sections, distinguishing it from open-drain variants like MAX6423XS44+.
How is the reset timeout period calculated for the MAX6422XS44+?
The reset timeout period tRP for MAX6422XS44+ is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the capacitor value in farads. For example, a 1500pF capacitor yields ~4.375ms timeout. This formula is given in the Pin Description section and validated in Typical Operating Characteristics figure toc02.
Can the MAX6422XS44+ operate reliably when VCC drops below 1.0V?
The MAX6422XS44+ guarantees valid RESET output only down to VCC = 1.0V. Below that, output drive capability degrades significantly. The datasheet explicitly states "guaranteed reset valid to VCC = 1V" and recommends a 100kΩ pullup to VCC for valid high-state assurance below 1V - a design consideration unique to the MAX6422XS44+'s active-high output.
What package type does the MAX6422XS44+ use, and how is it marked?
The MAX6422XS44+ uses a 4-pin SC70-4 package (2.0mm × 2.1mm), with top-mark "ADM" per the Standard Versions Table. This marking is laser-etched and matches the ordering suffix "XS" denoting SC70 packaging - distinct from "US" (SOT143) or "UK" (SOT23-5) variants.
MAX6422XS44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.375V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 3ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6422XS44+ FAQ
1.How can I place an order for MAX6422XS44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422XS44+ 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+ reliable?
The price and inventory of MAX6422XS44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422XS44+ is usually 5 days.
3.What payment methods are accepted for MAX6422XS44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422XS44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422XS44+?
MAX6422XS44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422XS44+ 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+?
For technical support, including MAX6422XS44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422XS44+ requirements.
6.How does Aetrix verify that MAX6422XS44+ is sourced from the original manufacturer or authorized distributors?
All MAX6422XS44+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6422XS44+?
All MAX6422XS44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422XS44+, 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+ part is unused and in its original packaging.
Return procedure for MAX6422XS44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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