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Analog Devices Inc./Maxim Integrated MAX6422US22+T
- Part No.:
- MAX6422US22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US22+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,608
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Product details
Overview
MAX6422US22+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 2.188V (typical), with capacitor-adjustable timeout (3.0–5.75ms at CSRT = 1500pF), guaranteed operation down to VCC = 1V, and 1.6µA typical quiescent current - used in battery-powered controllers and portable equipment for reliable power-up sequencing.
For engineers reviewing the MAX6422US22+T datasheet, MAX6422US22+T pinout, MAX6422US22+T application, or MAX6422US22+T equivalent, key selection criteria include its 2.188V reset threshold accuracy (±2.5% over temperature), SC70-4/SOT143-4 package compatibility, active-high push-pull output drive capability (VOH ≥ 0.8×VCC), and immunity to sub-50µs VCC transients.
Technical Context
The MAX6422US22+T implements a precision voltage-detection comparator with laser-trimmed internal resistors to set its 2.188V nominal reset threshold, coupled with a 240nA SRT pin ramp current source that charges an external capacitor to generate the reset timeout delay. Its active-high push-pull output ensures direct interface with µP reset inputs without external pullups.
It operates across -40°C to +125°C, maintains valid RESET assertion down to VCC = 1V, and features hysteresis of 4×VTH (≈8.75mV) to prevent chatter during slow VCC transitions. The device uses BiCMOS process technology and integrates 295 transistors for low leakage and stable threshold performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.188V (typ), ±2.5% over -40°C to +125°C - sets precise brownout detection point for 2.2V nominal systems |
| Quiescent Current | 1.6µA (typ) at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout | 3.0–5.75ms (at CSRT = 1500pF) - adjustable via external capacitor to match µP reset timing requirements |
| Output Type | Active-high push-pull - drives RESET high directly; no external pullup required; sinks 500µA at VCC ≥ 1.8V |
| VCC Operating Range | 1.0V to 5.5V - supports wide input rails including single-cell Li-ion (2.7–4.2V) and 3.3V/5V logic domains |
| Reset Propagation Delay | 80µs (VCC falling at 1mV/µs) - ensures fast response to supply collapse before µP executes invalid code |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial embedded environments |
Pinout & Package
MAX6422US22+T is packaged in a 4-pin SC70 (X4+1) or SOT143 (U4+1) surface-mount package, both 1.25mm × 1.65mm footprint, 0.95mm height, lead-free (RoHS-compliant), tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SC70) / 3 (SOT143) | RESET | Active-high push-pull reset output - drives µP reset input high during normal operation; pulls low during reset |
| 2 (SC70) / 1 (SOT143) | GND | Analog ground reference - must be connected to system ground plane with low-impedance path |
| 3 (SC70) / 2 (SOT143) | VCC | Supply voltage and monitored rail - powers device and provides input for threshold comparison |
| 4 (SC70) / 4 (SOT143) | SRT | Set-reset-time input - connects to external capacitor (CSRT) to program timeout period per tRP = 2.73×10⁶×CSRT + 275µs |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise matching to µP reset hold time requirements across diverse platforms using one standard part |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, avoiding undefined µP states in low-voltage battery discharge |
| 240nA SRT ramp current source | Provides stable, temperature-invariant timeout programming independent of VCC variations |
| Immunity to short VCC transients | Rejects <50µs glitches down to 100mV below threshold - prevents spurious resets in noisy power environments |
| Laser-trimmed reset threshold | Delivers ±2.5% accuracy over full temperature range without external calibration components |
Applications
| Battery-Powered Portable Controllers | Automotive Body Control Modules |
|---|---|
|
Use Scenario: A handheld medical monitor powered by a single Li-ion cell experiences gradual voltage sag during discharge. IC Role / Device Role / Timing Role: MAX6422US22+T continuously monitors VCC and asserts RESET when voltage drops below 2.188V, holding µP in reset until battery recovers or user intervenes. Use Value: Prevents erratic sensor readings and data corruption during undervoltage operation, extending usable battery runtime before shutdown. |
Use Scenario: A BCM supplies power to door locks, lighting, and window controls; VCC may dip during load dump or cold-crank events. IC Role / Device Role / Timing Role: MAX6422US22+T detects VCC dips below 2.188V and initiates controlled µP reset with 3–5.75ms timeout to ensure firmware reloads cleanly. Use Value: Eliminates lock/unlock command loss and prevents partial actuation due to brownout-induced µP hang. |
| Industrial Embedded Controllers | Medical Diagnostic Handhelds |
|
Use Scenario: A programmable logic controller (PLC) I/O module operates in harsh factory environments with fluctuating 3.3V supply. IC Role / Device Role / Timing Role: MAX6422US22+T supervises the 3.3V rail and triggers reset if voltage sags below 2.188V, with timeout adjusted via 1500pF capacitor to meet IEC 61000-4-11 immunity requirements. Use Value: Ensures deterministic recovery after power interruption, maintaining functional safety integrity without external watchdog intervention. |
Use Scenario: An ultrasound probe with integrated FPGA and analog front-end requires fail-safe startup under variable battery conditions. IC Role / Device Role / Timing Role: MAX6422US22+T monitors the 2.2V analog supply and asserts active-high RESET to hold FPGA configuration logic until stable power is confirmed. Use Value: Guarantees correct initialization sequence and avoids corrupted image acquisition due to premature clock enable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US22+T | Active-low push-pull RESET output; identical threshold, timeout, and package | Requires inverted logic interface - suitable where host µP accepts active-low reset only | Select when system design mandates active-low reset signaling and no level-shifting is desired |
| MAX6424UK22+T | 5-pin SOT23-5 package; same 2.188V threshold and active-high push-pull output | Larger footprint and different pinout - not drop-in compatible; requires PCB redesign | Choose only if SOT23-5 layout is already committed and SC70/SOT143 space constraints prohibit 4-pin variants |
Compared with MAX6421US22+T and MAX6424UK22+T, the MAX6422US22+T uniquely combines active-high push-pull drive with ultra-small SC70/SOT143 packaging - enabling compact, low-power designs where logic polarity and board area are critical constraints.
Availability
MAX6422US22+T is available at Aetrix Electronics and suitable for battery-powered portable controllers, automotive body control modules, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6422US22+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 MAX6422US22+T belongs to the MAX6340/MAX6421–MAX6426 family of low-power microprocessor supervisors designed specifically for reliable power-monitoring in space-constrained, battery-sensitive applications across automotive and medical end-equipment.
FAQ
What is the exact reset threshold voltage of the MAX6422US22+T?
The MAX6422US22+T has a nominal reset threshold voltage of 2.188V, with ±1.5% accuracy at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed at wafer test and specified in Table 1 of the datasheet under suffix "22".
Does the MAX6422US22+T require an external pullup resistor on the RESET pin?
No, the MAX6422US22+T features an active-high push-pull RESET output, so it actively drives high and low without needing an external pullup. This eliminates BOM cost and board space associated with discrete resistors and simplifies interface to µP reset inputs expecting active-high signals.
How do I calculate the external capacitor value for a specific reset timeout with the MAX6422US22+T?
Use the formula CSRT = (tRP − 275µs) / 2.735×10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 4.375ms timeout requires CSRT = (0.004375 − 0.000275) / 2.735×10⁶ = 1500pF. Ceramic capacitors with <10nA leakage are recommended.
Can the MAX6422US22+T operate reliably at VCC = 1.2V?
Yes, the MAX6422US22+T guarantees valid RESET output operation down to VCC = 1.0V, including proper threshold detection and push-pull drive strength. At VCC = 1.2V, VOH remains ≥ 0.8×VCC (≥0.96V) with 200µA source current, ensuring robust logic-level compatibility with low-voltage µPs.
What package options are available for the MAX6422US22+T?
The MAX6422US22+T is offered in two pin-compatible 4-pin packages: SC70-4 (X4+1 outline) and SOT143-4 (U4+1 outline). Both are RoHS-compliant, lead-free, tape-and-reel packaged, and share identical electrical specifications and pin functions - allowing layout flexibility without circuit redesign.
MAX6422US22+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:
- 2.188V
- 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
MAX6422US22+T FAQ
1.How can I place an order for MAX6422US22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US22+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 MAX6422US22+T reliable?
The price and inventory of MAX6422US22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US22+T is usually 5 days.
3.What payment methods are accepted for MAX6422US22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US22+T?
MAX6422US22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US22+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 MAX6422US22+T?
For technical support, including MAX6422US22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US22+T requirements.
6.How does Aetrix verify that MAX6422US22+T is sourced from the original manufacturer or authorized distributors?
All MAX6422US22+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 MAX6422US22+T meets industry standards.
7.What is the process for return or replacement of MAX6422US22+T?
All MAX6422US22+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US22+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 MAX6422US22+T part is unused and in its original packaging.
Return procedure for MAX6422US22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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