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Analog Devices Inc./Maxim Integrated MAX6422US26+T
- Part No.:
- MAX6422US26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US26+T.pdf
- Description:
- IC MPU/RESET CIRC 2.63V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,996
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Product details
Overview
MAX6422US26+T from Analog Devices is a low-power, active-high push-pull microprocessor supervisor IC that monitors VCC supply voltage and asserts a reset signal when voltage falls below 2.625V (±2.5% over temperature). It features capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), guaranteed operation down to VCC = 1V, and 1.6µA typical quiescent current. It is used in battery-powered controllers and portable equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6422US26+T datasheet, MAX6422US26+T pinout, MAX6422US26+T application, or MAX6422US26+T equivalent, key selection criteria include its 2.625V reset threshold accuracy, active-high push-pull output drive capability (VOH ≥ 0.8×VCC), capacitor-set timeout flexibility, and SC70/SOT143 package compatibility with space-constrained embedded systems.
Technical Context
The MAX6422US26+T implements a precision voltage-detection circuit using laser-trimmed resistors to set a factory-calibrated 2.625V reset threshold with ±2.5% tolerance across –40°C to +125°C. Its internal 240nA ramp current source charges an external SRT capacitor to generate a programmable reset timeout delay.
Unlike open-drain variants, the MAX6422US26+T uses a push-pull output stage capable of sourcing up to 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC - enabling direct interface to CMOS inputs without external pullups. Reset assertion occurs within 80µs of VCC falling below threshold, and deassertion requires both VCC recovery above threshold and full capacitor ramp to 0.65V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% over –40°C to +125°C - ensures deterministic reset activation across automotive and industrial temperature ranges |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 0.275ms (CSRT = 0) to 5.75ms (CSRT = 1500pF) - supports µP initialization timing requirements from fast-boot to safety-critical firmware validation |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies PCB layout versus open-drain alternatives |
| VCC Operating Range | 1.0V to 5.5V - guarantees valid reset assertion even during deep brownout conditions before system collapse |
| VCC to Reset Delay | 80µs maximum - provides rapid response to supply glitches without false triggering on short transients |
| Package | 4-pin SOT143 - 1.6mm × 2.1mm footprint ideal for compact portable and medical device designs |
Pinout & Package
MAX6422US26+T is housed in a 4-pin SOT143 package (package code U4+1), with exposed pad not electrically connected. Pin 1 is VCC, Pin 2 is GND, Pin 3 is RESET (active-high push-pull), and Pin 4 is SRT (capacitor-connected timeout adjust input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Supply voltage and reset threshold reference input | Monitors system rail; internal bandgap and comparator derive 2.625V trip point directly from this pin |
| GND (Pin 2) | Ground reference | Return path for internal current sources and output drivers; must be low-impedance for accurate threshold and timing |
| RESET (Pin 3) | Active-high push-pull reset output | Drives µP reset input high during normal operation; pulls low only during reset condition - no external pullup required |
| SRT (Pin 4) | Reset timeout capacitor connection | Accepts 240nA charging current; capacitor value directly sets timeout period per tRP = 2.73×10⁶×CSRT + 275µs |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.625V threshold | Laser-trimmed resistors ensure ±2.5% accuracy over full temperature range - eliminates manual calibration in production |
| Capacitor-adjustable timeout | External SRT capacitor sets reset hold time from 275µs to >5ms - accommodates diverse µP boot sequences without firmware changes |
| Active-high push-pull output | Direct-drive capability (VOH ≥ 0.8×VCC, VOL ≤ 0.4V) removes dependency on external pullup and reduces BOM count |
| Valid operation down to VCC = 1V | Guaranteed RESET logic state integrity during severe brownout - prevents undefined µP behavior near shutdown |
| Immunity to short VCC transients | Rejects <50µs negative glitches ≥100mV below threshold - avoids spurious resets in noisy power environments |
Applications
| Battery-Powered Portable Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: A handheld diagnostic tool powered by a single Li-ion cell (2.7–4.2V) requires reliable reset during battery discharge and cold cranking. IC Role / Device Role / Timing Role: MAX6422US26+T monitors VCC and asserts active-high RESET to hold the MCU in reset until voltage stabilizes above 2.625V after power-up or brownout. Use Value: The 1.6µA quiescent current extends battery shelf life; the 2.625V threshold aligns with minimum MCU operating voltage, preventing execution of corrupted code. | Use Scenario: A door module controller must survive load-dump and cold-crank events while maintaining deterministic reset behavior. IC Role / Device Role / Timing Role: MAX6422US26+T serves as primary power-on reset generator, interfacing directly with the MCU's active-high reset pin via push-pull output. Use Value: Guaranteed operation from –40°C to +125°C and immunity to 50µs/100mV transients ensure robustness in under-hood environments without additional filtering. |
| Medical Infusion Pump Logic Controller | Industrial PLC I/O Module |
Use Scenario: An infusion pump uses a low-voltage MCU and must guarantee safe shutdown and restart upon power interruption. IC Role / Device Role / Timing Role: MAX6422US26+T triggers reset when main 3.3V rail dips below 2.625V, holding the MCU in reset for ≥3ms (with 1500pF) to allow stable clock and memory initialization. Use Value: The capacitor-adjustable timeout ensures sufficient hold time for safety-critical firmware self-checks before release from reset. | Use Scenario: A DIN-rail mounted I/O module operates from unregulated 24V DC converted to 3.3V, subject to line transients and ripple. IC Role / Device Role / Timing Role: MAX6422US26+T supervises the 3.3V domain and drives the FPGA's active-high PROG_B pin to enforce controlled reconfiguration after brownout. Use Value: Push-pull output eliminates risk of floating reset lines in industrial noise environments; 80µs response time prevents metastability in FPGA configuration state machines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US26+T | Active-low push-pull output; identical threshold, timing, and package | Requires inverted reset logic on host MCU; incompatible with active-high-only reset inputs | Select when target µP accepts active-low reset and board layout already accommodates polarity |
| TLV803EB26DBZR | 2.63V threshold, 35µA ICC, fixed 200ms timeout, SOT23-3 package | Lacks adjustable timeout and ultra-low current; smaller footprint but higher power and inflexible timing | Choose for cost-sensitive, non-battery applications where fixed long timeout suffices and 3-pin simplicity is prioritized |
Compared with MAX6421US26+T and TLV803EB26DBZR, the MAX6422US26+T uniquely combines active-high push-pull drive, 1.6µA quiescent current, and capacitor-adjustable timeout in a 4-pin SOT143 - making it optimal for battery-powered systems requiring precise, low-power, polarity-matched reset control.
Availability
MAX6422US26+T is available at Aetrix Electronics and suitable for battery-powered portable controllers, automotive body electronics, and medical infusion pump logic requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6422US26+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 MAX6422US26+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power microprocessor supervisors, designed specifically for reliable power-on reset and brownout detection in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6422US26+T and how does it vary with temperature?
The MAX6422US26+T has a nominal reset threshold of 2.625V, 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 "26") and Electrical Characteristics section, where VTH min/max values are explicitly listed as 2.559V and 2.691V. The normalized threshold vs. temperature plot (toc08) shows drift remains within specification bounds across temperature.
Does the MAX6422US26+T require an external pullup resistor on its RESET pin?
No, the MAX6422US26+T does not require an external pullup resistor because it features an active-high push-pull output stage. As specified in the Electrical Characteristics table, VOH is guaranteed ≥0.8×VCC with sourcing capability up to 800µA, enabling direct connection to CMOS reset inputs. This eliminates BOM components and layout complexity compared to open-drain supervisors like MAX6423US26+T.
How is the reset timeout period set for the MAX6422US26+T, and what capacitor value yields a 4.0ms timeout?
The reset timeout period for MAX6422US26+T is set by connecting a capacitor (CSRT) between the SRT pin and GND. Using the formula tRP = 2.73×10⁶ × CSRT + 275µs, a 4.0ms timeout requires CSRT = (4.0×10⁻³ − 275×10⁻⁶) / 2.73×10⁶ ≈ 1365pF. Ceramic capacitors with leakage <10nA are recommended, and 1500pF yields 4.375ms (per datasheet tRP typ value).
Can the MAX6422US26+T operate reliably when VCC drops below 1.8V?
Yes, the MAX6422US26+T is fully specified to operate down to VCC = 1.0V, with guaranteed RESET output validity (VOH ≥ 0.8×VCC, VOL ≤ 0.4V) and functional reset assertion/deassertion. The datasheet explicitly states "Guaranteed Reset Valid to VCC = 1V" and confirms performance at VCC ≥ 1.0V in multiple Electrical Characteristics rows - critical for brownout resilience in Li-ion and coin-cell applications.
What package type and pin configuration does the MAX6422US26+T use, and how does it differ from the SC70 variant?
The MAX6422US26+T uses a 4-pin SOT143 package (U4+1 outline), with pin 1 = VCC, pin 2 = GND, pin 3 = RESET, pin 4 = SRT. The "US" in the part number denotes SOT143; "XS" would indicate SC70. Both packages share identical electrical specs and pin functions, but SOT143 has slightly larger pad dimensions (1.6mm × 2.1mm vs. SC70's 1.25mm × 2.0mm) and different land pattern (90-0183 vs. 90-0187), requiring separate PCB footprints.
MAX6422US26+T 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:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6422US26+T FAQ
1.How can I place an order for MAX6422US26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US26+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 MAX6422US26+T reliable?
The price and inventory of MAX6422US26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US26+T is usually 5 days.
3.What payment methods are accepted for MAX6422US26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US26+T?
MAX6422US26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US26+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 MAX6422US26+T?
For technical support, including MAX6422US26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US26+T requirements.
6.How does Aetrix verify that MAX6422US26+T is sourced from the original manufacturer or authorized distributors?
All MAX6422US26+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 MAX6422US26+T meets industry standards.
7.What is the process for return or replacement of MAX6422US26+T?
All MAX6422US26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US26+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 MAX6422US26+T part is unused and in its original packaging.
Return procedure for MAX6422US26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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