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Analog Devices Inc./Maxim Integrated MAX6422US16-T
- Part No.:
- MAX6422US16-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US16-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6422US16-T from Maxim Integrated is an active-high, push-pull microprocessor reset supervisor IC designed for reliable power-on and brownout detection in low-voltage embedded systems. It monitors VCC from 1.6V to 5V, asserts a high-level RESET signal when VCC falls below 1.575V (±2.5% over temperature), and maintains reset for a capacitor-adjustable timeout period (275µs minimum). It operates down to VCC = 1V and draws only 1.6µA typical quiescent current, making it suitable for battery-powered portable controllers and medical instrumentation.
For engineers reviewing the MAX6422US16-T datasheet, MAX6422US16-T pinout, MAX6422US16-T application, or MAX6422US16-T equivalent, key selection criteria include its active-high push-pull output, SC70/SOT143-4 package compatibility, factory-trimmed 1.575V reset threshold, guaranteed reset validity at VCC ≥ 1V, and immunity to short VCC transients up to 50µs at 100mV overdrive.
Technical Context
The MAX6422US16-T implements a precision voltage comparator with laser-trimmed internal reference to detect VCC falling below its 1.575V threshold. Its reset timeout is generated by a 240nA internal ramp current charging an external capacitor (CSRT) to a 0.65V internal reference, yielding tRP = 2.73×10⁶ × CSRT + 275µs.
Unlike open-drain variants, the MAX6422US16-T features a push-pull output stage capable of sourcing up to 800µA and sinking up to 3.2mA while maintaining VOH ≥ 0.8×VCC and VOL ≤ 0.4V at VCC ≥ 4.5V - enabling direct interface to CMOS inputs without external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±2.5% over -40°C to +125°C - ensures reliable detection of brownout events across automotive and industrial temperature ranges |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year operation on coin-cell batteries in portable equipment |
| Reset Timeout Min | 275µs with CSRT = 0 - guarantees sufficient hold time for µP initialization even without external capacitor |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion down to 1V, critical for graceful shutdown sequencing |
| Output Type | Active-high push-pull - eliminates need for external pull-up resistor and simplifies PCB layout |
| VCC to Reset Delay | 80µs max at 1mV/µs VCC fall rate - provides fast response to supply collapse |
| Hysteresis | 4×VTH = 6.3mV - prevents chatter during slow-rising/falling VCC transitions |
Pinout & Package
MAX6422US16-T is housed in a 4-pin SOT143-4 surface-mount package (outline 21-0052), with 1.3mm × 1.3mm footprint and 0.95mm height. Pin 1 is VCC, Pin 2 is GND, Pin 3 is RESET (active-high push-pull), and Pin 4 is SRT (capacitor-adjustable timeout input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Supply voltage and reset threshold monitor input | Primary power rail connection; device monitors this node for undervoltage conditions and powers internal circuitry |
| GND (Pin 2) | Ground reference | Return path for all internal currents and reference point for VCC and SRT voltage measurements |
| RESET (Pin 3) | Active-high push-pull reset output | Drives µP reset input high during fault; sinks current when deasserted, sources current when asserted - no external pull-up required |
| SRT (Pin 4) | Set reset timeout input | Connects to external capacitor to set timeout period per tRP = 2.73×10⁶ × CSRT + 275µs; sensitive to leakage and stray capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset pulse width (275µs to >100ms) via single external capacitor - accommodates diverse µP startup requirements |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout or controlled power-down sequences before system power collapse |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration at 100mV overdrive - prevents spurious resets in noisy power environments |
| Low 1.6µA quiescent current | Minimizes battery drain in always-on monitoring applications such as wearable health sensors and remote telemetry nodes |
| Factory-trimmed 1.575V reset threshold | Eliminates need for external resistor dividers or calibration; ±2.5% accuracy over full temperature range ensures robust margining |
Applications
| Battery-Powered Portable Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: A handheld glucose meter powered by a single CR2032 coin cell must initialize its ADC and display reliably after cold start or battery replacement. IC Role / Device Role / Timing Role: MAX6422US16-T monitors the 3.0V regulated rail and asserts active-high RESET until stable, then holds reset for ≥10ms (via 1nF SRT cap) to ensure full µP boot sequence completion. Use Value: The 1.6µA quiescent current extends battery life beyond 2 years in standby; the 1.575V threshold provides 425mV headroom above minimum operating voltage of the µP. |
Use Scenario: An ECG patch continuously samples biopotentials and transmits data via BLE; firmware must recover cleanly from intermittent battery contact loss. IC Role / Device Role / Timing Role: MAX6422US16-T detects VCC sag below 1.575V during connector bounce and asserts RESET for 100ms (via 33nF SRT cap), preventing corrupted memory writes during partial power restoration. Use Value: Active-high push-pull output directly drives the BLE SoC's active-high reset pin without level-shifting; guaranteed operation down to VCC = 1V avoids false releases during rapid discharge. |
| Automotive Body Control Modules | Industrial Sensor Transmitters |
Use Scenario: A LIN bus node in a door module experiences load-dump-induced VCC dips during alternator regulation faults. IC Role / Device Role / Timing Role: MAX6422US16-T monitors the 5V supply derived from the vehicle battery and triggers a clean µP reset if VCC drops below 1.575V, with timeout set to 50ms to cover worst-case transient duration. Use Value: Immunity to 50µs transients at 100mV overdrive prevents nuisance resets during normal switching noise; -40°C to +125°C rating matches under-hood thermal requirements. |
Use Scenario: A 4–20mA loop-powered pressure transmitter must maintain accurate zero calibration during 24V supply fluctuations caused by long cable runs. IC Role / Device Role / Timing Role: MAX6422US16-T supervises the internal 3.3V LDO output and initiates reset if input sag causes regulator dropout, holding reset for 20ms to allow analog front-end stabilization post-recovery. Use Value: Factory-trimmed 1.575V threshold aligns precisely with LDO dropout voltage; push-pull output ensures fast, low-impedance reset assertion compatible with isolated µP reset inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US16-T | Active-low push-pull RESET output; identical threshold, timeout, and package | Requires µP with active-low reset input; incompatible with active-high-only designs | Select when interfacing to legacy µPs requiring inverted reset polarity |
| MAX6423US16-T | Active-low open-drain RESET output; same threshold and timeout capability | Needs external pull-up resistor; supports wired-OR reset with auxiliary circuits | Choose when system requires multiple reset sources or mixed-voltage logic interfacing |
Compared with MAX6422US16-T, MAX6421US16-T offers identical supervision performance but inverted logic polarity, while MAX6423US16-T trades push-pull drive strength for open-drain flexibility - both require board-level redesign due to different output configurations and pin assignments.
Availability
MAX6422US16-T is available at Aetrix Electronics and suitable for battery-powered portable controllers, medical diagnostic handhelds, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6422US16-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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervisors optimized for space-constrained, battery-sensitive systems where deterministic power-on reset timing and brownout immunity are critical.
FAQ
What is the exact reset threshold voltage of the MAX6422US16-T?
The MAX6422US16-T has a factory-trimmed nominal reset threshold of 1.575V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 1 of the datasheet and applies specifically to the "16" suffix variant. The MAX6422US16-T uses laser-trimmed resistors to achieve this accuracy without external components.
Does the MAX6422US16-T require an external capacitor to function?
No, the MAX6422US16-T operates with a minimum reset timeout of 275µs even when the SRT pin is left unconnected (CSRT = 0). An external capacitor is optional and used only to extend the timeout period beyond this base value using the formula tRP = 2.73×10⁶ × CSRT + 275µs. The MAX6422US16-T remains fully functional as a reset supervisor without any external capacitor.
What package type does the MAX6422US16-T use, and what are its dimensions?
The MAX6422US16-T uses a 4-pin SOT143-4 surface-mount package (package code U4+1, outline 21-0052), measuring 1.3mm × 1.3mm with a maximum height of 0.95mm. This compact footprint is identical to the SC70-4 variant but uses a different leadframe geometry - both packages share the same pinout and thermal characteristics per Maxim's land pattern documentation.
Can the MAX6422US16-T operate with a supply voltage below 1.6V?
Yes, the MAX6422US16-T is specified to monitor VCC from 1.0V to 5.5V and guarantees valid reset assertion down to VCC = 1.0V. While its reset threshold is fixed at 1.575V, the device continues to assert RESET as long as VCC remains below that threshold - even if VCC drops to 1.0V. This behavior is explicitly documented in the Electrical Characteristics table and Typical Operating Characteristics.
How does the MAX6422US16-T handle short voltage transients on the VCC line?
The MAX6422US16-T is immune to short negative-going VCC transients up to 50µs in duration when the overdrive magnitude is 100mV below the 1.575V threshold. This immunity is verified in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph (toc05) and ensures no spurious resets occur during typical switching noise or load-dump events. The MAX6422US16-T achieves this via internal filtering and hysteresis design.
MAX6422US16-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:
- 1.575V
- 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-23-4
MAX6422US16-T FAQ
1.How can I place an order for MAX6422US16-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US16-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 MAX6422US16-T reliable?
The price and inventory of MAX6422US16-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US16-T is usually 5 days.
3.What payment methods are accepted for MAX6422US16-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US16-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US16-T?
MAX6422US16-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US16-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 MAX6422US16-T?
For technical support, including MAX6422US16-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US16-T requirements.
6.How does Aetrix verify that MAX6422US16-T is sourced from the original manufacturer or authorized distributors?
All MAX6422US16-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 MAX6422US16-T meets industry standards.
7.What is the process for return or replacement of MAX6422US16-T?
All MAX6422US16-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US16-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 MAX6422US16-T part is unused and in its original packaging.
Return procedure for MAX6422US16-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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