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Analog Devices Inc./Maxim Integrated MAX6420UK33+T
- Part No.:
- MAX6420UK33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK33+T.pdf
- Description:
- IC MPU/RESET CIRC 3.30V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
The MAX6420UK33+T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 3.3V VCC reset threshold (±2.5% over temperature), an adjustable RESET IN input (1.26V reference), and active-low open-drain RESET output. It monitors both core supply (VCC) and auxiliary rail (e.g., I/O or analog supply) with capacitor-adjustable reset timeout (275µs to 5.75ms), and operates across -40°C to +125°C for automotive and industrial embedded control.
For engineers reviewing the MAX6420UK33+T datasheet, MAX6420UK33+T pinout, MAX6420UK33+T application, or MAX6420UK33+T equivalent, key selection criteria include dual-rail monitoring capability, guaranteed RESET validity down to VCC = 1V, 1.7µA typical quiescent current at 1.8V, and AEC-Q100-qualified variants for automotive use - all validated for brownout immunity and transient rejection in battery-powered systems.
Technical Context
The MAX6420UK33+T implements dual-threshold supervision: a laser-trimmed 3.3V fixed threshold for VCC monitoring and a high-impedance 1.26V reference input (RESET IN) for externally adjustable voltage detection via resistor divider. Reset assertion occurs when either VCC falls below 3.3V or RESET IN falls below its programmed threshold, with manual reset support via external switch parallel to R2.
Its reset timeout is generated by a precision 240nA internal ramp current charging an external capacitor (SRT-to-GND), requiring <10nA leakage capacitance (ceramic recommended); deassertion occurs when ramp voltage reaches 0.65V. The open-drain RESET output supports logic-level translation up to 5.5V and is compatible with µP reset inputs requiring active-low assertion with pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.30V ±2.5% over -40°C to +125°C - ensures reliable power-up sequencing for 3.3V systems with brownout margin |
| RESET IN Reference Voltage | 1.26V ±33mV hysteresis - enables precise external voltage monitoring (e.g., 1.8V, 2.5V rails) using high-value resistors |
| Quiescent Current | 1.7µA typical at VCC = 1.8V - extends battery life in portable and always-on monitoring applications |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - configurable delay prevents premature µP release during slow-rising supplies |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and medical equipment environments |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and interface to multiple logic families (0–5.5V pullup) |
| Supply Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout conditions |
Pinout & Package
SOT23-5 package (U5+2A outline, RoHS-compliant, 5-pin surface-mount). Thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output; requires external pullup; sinks ≥500µA at VCC ≥ 2.7V for robust µP reset assertion |
| 2 | GND | Analog/digital ground reference; must be low-impedance connection to minimize noise coupling into sensitive comparators |
| 3 | RESET IN | High-impedance input (10nA leakage) for adjustable threshold; connects to center tap of resistor divider for external rail monitoring |
| 4 | SRT | Set Reset Timeout input; drives 240nA constant current into external capacitor; trace must be short and isolated from digital noise |
| 5 | VCC | Supply input and fixed-threshold monitor input; powers internal circuitry and provides reference for 3.3V VCC supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises 3.3V VCC and user-defined auxiliary rail (e.g., 1.8V/2.5V) without additional components |
| Capacitor-adjustable timeout | Enables precise reset hold time tuning (275µs–5.75ms) to match µP reset timing requirements across voltage ramps |
| Low-power operation | 1.7µA typical ICC at 1.8V enables multi-year battery life in remote sensors and wearables |
| Open-drain RESET output | Supports level-shifting to 5.5V logic and wired-OR reset bus configurations for system-wide reset coordination |
| Brownout immunity | Rejects transients ≤50µs at 100mV overdrive - prevents spurious resets during switching noise or load dumps |
Applications
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 5V sensor interface rail in vehicle door module with CAN communication. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting active-low RESET to MCU and peripheral ASICs during ignition cycling or battery dip. Use Value: Prevents firmware corruption during 12V battery sag to 6V by holding RESET until both rails stabilize above thresholds. |
Use Scenario: Supervises 3.3V FPGA configuration supply and 24V field-side I/O power in modular PLC backplane. IC Role / Device Role / Timing Role: Provides independent reset assertion for logic domain and isolated I/O domain using single IC. Use Value: Eliminates need for two discrete supervisors, reducing BOM count and PCB area while maintaining functional safety separation. |
| Portable Medical Infusion Pump | Battery-Powered Smart Meter |
Use Scenario: Ensures safe startup and fault recovery in lithium-ion powered infusion pump with dual 3.3V logic and 5V motor driver rails. IC Role / Device Role / Timing Role: Generates timed reset pulse after battery insertion or low-battery recovery, synchronized to both supply domains. Use Value: Guarantees deterministic state initialization before motor activation, meeting IEC 60601-1 essential performance requirements. |
Use Scenario: Monitors 3.3V RF SoC supply and 1.8V metrology ADC supply in AMI smart meter operating from coin-cell backup. IC Role / Device Role / Timing Role: Holds µP in reset during brownout events on either rail, enabling accurate energy measurement continuity. Use Value: Achieves <1.7µA total system quiescent current during sleep mode while maintaining dual-rail fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK33+T | Active-low push-pull RESET output; no external pullup required; same 3.3V/adjustable dual-threshold architecture | Preferred where µP reset pin requires driven high/low (no pullup needed) and board space permits slightly higher drive strength | Select MAX6418UK33+T if system lacks pullup resistor and µP accepts push-pull RESET; otherwise MAX6420UK33+T offers greater interface flexibility |
| TPS3808G33DBVR | Fixed 3.3V threshold only; no adjustable RESET IN; 350ms min timeout (non-adjustable); 2.5µA ICC | Suitable for single-rail systems where auxiliary rail monitoring is unnecessary and fixed long timeout suffices | Choose TPS3808G33DBVR only for cost-sensitive single-supply designs lacking dual-rail requirements; MAX6420UK33+T is mandatory for dual-voltage supervision |
Compared with MAX6418UK33+T and TPS3808G33DBVR, the MAX6420UK33+T uniquely delivers open-drain flexibility for mixed-voltage systems and true dual-rail monitoring - critical for designs requiring coordinated reset across disparate supply domains without added components.
Availability
MAX6420UK33+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, portable medical devices, and battery-powered smart meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK33+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 and mixed-signal ICs for demanding industrial, automotive, and medical applications, with emphasis on low-power, high-reliability solutions.
The MAX6412–MAX6420 family was engineered specifically for microprocessor reset supervision in harsh environments, delivering dual-voltage monitoring, capacitor-tunable timing, and AEC-Q100 qualification for automotive-grade reliability.
FAQ
What is the exact VCC reset threshold voltage for MAX6420UK33+T?
The MAX6420UK33+T has a factory-laser-trimmed VCC reset threshold of 3.30V, with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is confirmed in the Electrical Characteristics table and corresponds to suffix "33" per the Reset Voltages Suffix Table in the datasheet.
Does MAX6420UK33+T support monitoring a second voltage besides VCC?
Yes, the MAX6420UK33+T supports dual-voltage monitoring: its RESET IN pin accepts an externally programmed threshold using a resistor divider referenced to a precise 1.26V internal comparator. This enables supervision of auxiliary rails such as 1.8V, 2.5V, or 5V, independent of the 3.3V VCC threshold.
What type of capacitor should be used on the SRT pin of MAX6420UK33+T?
The SRT pin of MAX6420UK33+T requires a low-leakage ceramic capacitor (<10nA) with stable dielectric properties (e.g., X7R or C0G). Typical values range from 0pF (for minimum 275µs timeout) to 1500pF (for ~5.75ms timeout); avoid electrolytic or high-leakage film types which distort timing accuracy.
Is MAX6420UK33+T qualified for automotive applications?
The MAX6420UK33+T itself is not automotive-qualified; however, the MAX6420UK33/V+T variant is AEC-Q100 Grade 1 qualified (-40°C to +125°C) and specified for automotive use. Always verify ordering code suffix "/V" for automotive compliance - standard MAX6420UK33+T is industrial-grade.
How does the open-drain RESET output of MAX6420UK33+T interface with different logic levels?
The open-drain RESET output of MAX6420UK33+T can be pulled up to any voltage from 0V to 5.5V, enabling direct interface with 1.8V, 3.3V, or 5V microprocessors without level shifters. Its 500µA sink capability at VCC ≥ 2.7V ensures robust low-state assertion across logic families.
MAX6420UK33+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.3V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6420UK33+T FAQ
1.How can I place an order for MAX6420UK33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK33+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 MAX6420UK33+T reliable?
The price and inventory of MAX6420UK33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK33+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK33+T?
MAX6420UK33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK33+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 MAX6420UK33+T?
For technical support, including MAX6420UK33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK33+T requirements.
6.How does Aetrix verify that MAX6420UK33+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK33+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 MAX6420UK33+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK33+T?
All MAX6420UK33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK33+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 MAX6420UK33+T part is unused and in its original packaging.
Return procedure for MAX6420UK33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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