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Analog Devices Inc./Maxim Integrated MAX6422US26+
- Part No.:
- MAX6422US26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US26+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,357
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Product details
Overview
MAX6422US26+ from Maxim Integrated is a low-power microprocessor supervisor IC that monitors 2.625V system supply voltage and asserts an active-high push-pull reset signal when VCC falls below threshold. It features capacitor-adjustable reset timeout (275µs base + 2.73s/F·CSRT), guaranteed reset validity down to VCC = 1V, and consumes only 1.6µA typical quiescent current. It is used in battery-powered embedded controllers requiring reliable power-on reset with flexible timing.
For engineers reviewing the MAX6422US26+ datasheet, MAX6422US26+ pinout, MAX6422US26+ application, or MAX6422US26+ equivalent, key selection criteria include its active-high push-pull output, SOT143-4 package, 2.625V factory-trimmed reset threshold, ±2.5% accuracy over -40°C to +125°C, and immunity to sub-50µs VCC transients at 100mV overdrive.
Technical Context
The MAX6422US26+ implements a precision bandgap-based voltage detector with laser-trimmed resistors to set the 2.625V reset threshold. Its reset timeout is generated by a 240nA internal current source charging an external capacitor (CSRT) to a 0.65V ramp threshold, enabling accurate, temperature-stable delay adjustment.
It operates across 1.0V–5.5V supply range and guarantees valid RESET output for VCC ≥ 1V. The push-pull output drives high to 0.8×VCC at 200µA source current and low to 0.4V at 3.2mA sink current, eliminating need for external pull-up components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% (factory-laser-trimmed; ensures precise brownout detection at nominal 2.625V) |
| Quiescent Current | 1.6µA typical (enables multi-year operation in coin-cell–powered systems) |
| Reset Timeout Base | 275µs minimum (fixed internal delay before CSRT-controlled extension begins) |
| Timeout Scaling Factor | 2.73 s/F (defines linear relationship between CSRT capacitance and total timeout period) |
| VCC Validity Range | 1.0V to 5.5V (guarantees functional reset assertion/deassertion down to 1V supply) |
| Output Type | Active-high push-pull (drives µP reset input directly without external resistor) |
| Transient Immunity | No reset for ≤50µs VCC glitches at 100mV overdrive (prevents false resets during noise events) |
Pinout & Package
MAX6422US26+ is housed in a 4-pin SOT143-4 surface-mount package (1.3mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (active-high push-pull output), and Pin 4 is VCC (supply and threshold monitoring input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Capacitor connection node for reset timeout adjustment | Accepts external capacitor (CSRT) to set precise reset hold time; sensitive to leakage-requires short, clean trace |
| 2 - GND | Analog and digital ground reference | Common return path for internal voltage reference and output stage; must be low-impedance |
| 3 - RESET | Active-high push-pull reset output | Drives µP reset pin directly; sinks up to 3.2mA and sources up to 200µA without external components |
| 4 - VCC | Supply input and monitored voltage rail | Both powers the device and serves as the monitored rail; reset triggers when this voltage drops below 2.625V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific reset hold times (e.g., 100ms for slow-start regulators) via single external capacitor |
| Active-high push-pull output | Eliminates need for external pull-up resistor, reducing BOM count and PCB area in µP reset circuits |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset behavior during deep brownout or ultra-low-power wake-up sequences |
| Low 1.6µA quiescent current | Extends battery life in always-on monitoring applications such as medical wearables and remote sensors |
| ±2.5% reset threshold accuracy over temperature | Maintains reliable trip point across automotive (-40°C to +125°C) and industrial environments without calibration |
Applications
| Battery-Powered Embedded Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Microcontroller in a wireless sensor node powered by a CR2032 coin cell must execute safe boot sequence after cold start or voltage sag. IC Role / Device Role / Timing Role: MAX6422US26+ monitors VCC and holds the µP in reset until stable 2.625V is reached and sustained for user-defined timeout. Use Value: Prevents code execution errors during marginal power conditions; 1.6µA supply current extends battery life beyond 5 years. | Use Scenario: Central body controller in a vehicle requires robust reset during load-dump or battery-reconnect events. IC Role / Device Role / Timing Role: MAX6422US26+ provides active-high reset to MCU upon 12V system voltage drop below 2.625V, with timeout configurable to match CAN bus initialization timing. Use Value: ±2.5% threshold accuracy over -40°C to +125°C ensures consistent behavior across full automotive temperature range. |
| Portable Medical Instruments | Industrial Programmable Logic Controllers |
Use Scenario: Handheld blood glucose meter must guarantee error-free startup after battery insertion or low-battery recovery. IC Role / Device Role / Timing Role: MAX6422US26+ asserts active-high RESET until VCC exceeds 2.625V and remains asserted for ≥100ms (via 36nF CSRT) to allow analog front-end stabilization. Use Value: Push-pull output eliminates pull-up resistor, saving board space and avoiding leakage-induced timing drift in high-impedance analog sections. | Use Scenario: DIN-rail mounted PLC experiences wide input voltage variation (18–32V DC) and must maintain deterministic reset during line fluctuations. IC Role / Device Role / Timing Role: MAX6422US26+ supervises local 3.3V LDO output, asserting reset on undervoltage while ignoring <50µs transients induced by relay switching. Use Value: Immunity to short VCC transients prevents spurious resets during normal industrial switching noise, improving system uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US26+ | Active-low push-pull RESET output; identical threshold, package, and timeout architecture | Requires µP with active-low reset input; incompatible with active-high-only reset pins | Select when target µP accepts only active-low reset assertion |
| TLV803EB26DBZR | Fixed 2.63V threshold, 200ms factory-fixed timeout, SOT23-3 package, no external capacitor support | Lacks timeout adjustability; smaller footprint but less design flexibility for timing-critical systems | Select when fixed timeout suffices and board space is extremely constrained |
Compared with MAX6421US26+, the MAX6422US26+ enables direct interface to active-high reset inputs without logic inversion, while TLV803EB26DBZR trades adjustability for minimal footprint and simplified layout-making it suitable only where timing requirements are static and space is premium.
Availability
MAX6422US26+ is available at Aetrix Electronics and suitable for battery-powered embedded controllers, automotive body electronics, portable medical instruments, and industrial programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6422US26+ 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, communications, and consumer applications.
The MAX6421–MAX6426 family was designed specifically for low-power microprocessor supervision in space- and energy-constrained systems, emphasizing precision threshold accuracy, ultra-low quiescent current, and flexible reset timing via external capacitor.
FAQ
What is the exact reset threshold voltage of the MAX6422US26+?
The MAX6422US26+ has a factory-laser-trimmed reset threshold of 2.625V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 1 of the datasheet under suffix "26", and applies specifically to the MAX6422US26+ variant-not the broader MAX6422 family.
Does the MAX6422US26+ require an external pull-up resistor on its RESET pin?
No, the MAX6422US26+ does not require an external pull-up resistor because it features an active-high push-pull RESET output. The output actively drives high (to 0.8×VCC) and low (to 0.4V at 3.2mA), enabling direct connection to µP reset inputs without additional components-unlike open-drain variants such as MAX6423US26+.
How is the reset timeout period calculated for the MAX6422US26+?
The reset timeout period tRP for the MAX6422US26+ is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 36nF capacitor yields ~100ms total timeout. This formula is explicitly defined in the Pin Description section and validated across temperature in Typical Operating Characteristics figure toc02.
What package type and dimensions does the MAX6422US26+ use?
The MAX6422US26+ uses the 4-pin SOT143-4 package (1.3mm × 2.1mm × 0.95mm body size), as confirmed in the Ordering Information table and Package Information section. This matches the "US" suffix designation (e.g., MAX6422US26+), distinguishing it from SC70-4 ("XS") and SOT23-5 ("UK") variants in the same family.
Can the MAX6422US26+ operate reliably below 1.6V supply voltage?
Yes-the MAX6422US26+ is fully specified to operate down to VCC = 1.0V, with guaranteed RESET functionality (both assertion and deassertion) throughout this range. The datasheet states "Guaranteed Reset Valid to VCC = 1V", and electrical characteristics tables confirm parameters like ICC and VTH are tested at VCC = 1.0V.
MAX6422US26+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- 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:
- SOT-23-4
MAX6422US26+ FAQ
1.How can I place an order for MAX6422US26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US26+ 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 MAX6422US26+ reliable?
The price and inventory of MAX6422US26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US26+ is usually 5 days.
3.What payment methods are accepted for MAX6422US26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US26+?
MAX6422US26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US26+ 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 MAX6422US26+?
For technical support, including MAX6422US26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US26+ requirements.
6.How does Aetrix verify that MAX6422US26+ is sourced from the original manufacturer or authorized distributors?
All MAX6422US26+ 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 MAX6422US26+ meets industry standards.
7.What is the process for return or replacement of MAX6422US26+?
All MAX6422US26+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US26+, 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 MAX6422US26+ part is unused and in its original packaging.
Return procedure for MAX6422US26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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