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Analog Devices Inc./Maxim Integrated MAX6420UK22+T
- Part No.:
- MAX6420UK22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK22+T.pdf
- Description:
- IC MPU/RESET CIRC 2.188V SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6420UK22+T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 2.2V fixed VCC reset threshold and an adjustable RESET IN input (1.26V threshold) for monitoring secondary voltages. It provides active-low open-drain reset output with capacitor-adjustable timeout (275µs to >5ms), guaranteed valid reset operation down to VCC = 1V, and operates across –40°C to +125°C. It is used in automotive power management systems to ensure reliable μP restart during brownout conditions.
For engineers reviewing the MAX6420UK22+T datasheet, MAX6420UK22+T pinout, MAX6420UK22+T application, or MAX6420UK22+T equivalent, key selection considerations include its dual-threshold architecture, open-drain output compatibility with mixed-supply logic, AEC-Q100 qualification (per /V variants), capacitor-programmable reset delay, and guaranteed reset validity at VCC ≥ 1V - critical for battery-backed and automotive embedded controllers.
Technical Context
The MAX6420UK22+T integrates two independent reset comparators: one monitors VCC against a laser-trimmed 2.2V threshold (±2.5% over temperature), while the second monitors an external voltage via RESET IN using a 1.26V internal reference and external resistor divider. Reset assertion occurs if either input falls below its threshold or manual reset is triggered (though MR is omitted in MAX6420).
Its open-drain RESET output supports level-shifting across supply domains (0–5.5V pull-up), and the SRT pin sources a precise 240nA current to charge an external capacitor, generating a programmable timeout period (tRP = 2.71×10⁶ × CSRT + 275µs). The device draws only 1.7µA typical supply current at VCC ≤ 2.0V and maintains immunity to transients ≤ 50µs when VCC dips 100mV below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 2.200V ±2.5% over –40°C to +125°C - ensures accurate brownout detection for 2.2V–2.5V core rails. |
| Adjustable Input Threshold | 1.26V internal reference - enables monitoring of secondary supplies (e.g., 3.3V, 5V) via external resistor divider. |
| Reset Output Type | Active-low open-drain - allows wired-OR configuration and interface to higher-voltage µP reset inputs (up to 5.5V). |
| Supply Current | 1.7µA typical at VCC ≤ 2.0V - minimizes quiescent load in battery-critical applications like telematics modules. |
| Reset Timeout Range | 275µs (no capacitor) to >5.75ms (1500pF) - supports wide range of µP reset timing requirements without firmware dependency. |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive and industrial control environments. |
| VCC Validity Limit | RESET guaranteed valid down to VCC = 1.0V - prevents undefined reset state during deep brownout recovery. |
Pinout & Package
SOT23-5 package (U5+2A outline), 5-pin surface-mount, RoHS-compliant, thermal resistance θJA = 255.9°C/W (multi-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low to assert reset; requires external pull-up to system reset rail (e.g., 3.3V or 5V); compatible with mixed-voltage µPs. |
| 2 - GND | Ground reference | Primary return path for internal comparators, SRT current source, and RESET driver; must be low-impedance. |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (10nA leakage); connects to center tap of resistor divider to set secondary voltage threshold (e.g., 3.3V @ 1.26V ref). |
| 4 - SRT | Set reset timeout current source | 240nA constant current source; connect external capacitor to GND to program timeout; sensitive to PCB leakage and noise. |
| 5 - VCC | Supply and primary monitor input | Powers device and feeds fixed 2.2V reset comparator; functional down to 1.0V; monitors core supply directly. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (2.2V fixed) and external rail (via RESET IN), enabling single-chip protection for multi-rail systems like ADAS domain controllers. |
| Capacitor-programmable reset timeout | Eliminates need for internal timer circuitry; allows field-tunable delay (275µs–5.75ms) using standard ceramic capacitors - simplifies compliance with diverse µP reset timing specs. |
| Open-drain RESET with wide voltage tolerance | Supports pull-up to any supply between 0V and 5.5V, enabling direct interface to legacy 5V µPs or modern 1.8V/3.3V logic without level shifters. |
| AEC-Q100 qualified variants available | MAX6420UK22/V+T is automotive-qualified; this MAX6420UK22+T shares identical electrical specs and packaging - suitable for pre-qualification design-in. |
| Ultra-low quiescent current | 1.7µA typical at low VCC enables >10-year battery life in always-on automotive modules (e.g., CAN gateway wake-up supervisors). |
Applications
| Automotive Body Control Module (BCM) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 2.2V microcontroller core supply and 5V motor driver rail in a vehicle door module subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to both MCU and safety watchdog; timeout set to 4.375ms to exceed MCU's minimum reset pulse width. Use Value: Prevents erratic MCU behavior during battery voltage sag by guaranteeing clean reset assertion/deassertion even at VCC = 1.1V. |
Use Scenario: Ensures fail-safe restart of ARM-based pump controller during AC/DC adapter dropout or internal LDO fault. IC Role / Device Role / Timing Role: Supervises 3.3V system rail (via RESET IN divider) and 2.2V backup rail (VCC); RESET tied to MCU and motor driver enable lines. Use Value: Open-drain output allows shared reset bus with other safety-critical ICs; low 1.7µA ICC extends battery runtime during portable operation. |
| Industrial PLC I/O Expansion Card | Automotive Telematics Control Unit (TCU) |
Use Scenario: Protects FPGA-based I/O processor from configuration corruption during 24V DC input fluctuations in factory automation cabinets. IC Role / Device Role / Timing Role: Uses VCC = 2.2V rail as primary monitor and RESET IN to track isolated 5V I/O supply; SRT capacitor set for 3ms timeout. Use Value: Guaranteed reset validity to VCC = 1V avoids metastability during slow power ramp-up; high-temp rating supports convection-cooled enclosures. |
Use Scenario: Provides robust reset coordination between LTE modem, GNSS receiver, and application processor in a cellular-connected vehicle ECU. IC Role / Device Role / Timing Role: Monitors 1.8V AP core (via RESET IN divider) and 2.2V modem supply (VCC); RESET drives common reset tree with 5V pull-up. Use Value: Capacitor-adjustable timeout accommodates varying reset timing requirements across heterogeneous SoCs; AEC-Q100-compatible design foundation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK22/V+T | AEC-Q100 qualified; identical electrical specs, same SOT23-5 package and pinout; differs only in automotive-grade screening and traceability. | Required for production automotive ECUs; not needed for industrial or medical prototypes. | Select MAX6420UK22/V+T for final automotive designs; MAX6420UK22+T is ideal for pre-qualification evaluation and non-automotive use. |
| TPS3808G33DBVR | Fixed 3.3V VDD monitor only; no adjustable input; push-pull active-low RESET; 35µA ICC; 200ms min timeout (non-adjustable). | Lacks dual-rail capability; unsuitable where secondary voltage supervision is required. | Use only when monitoring a single 3.3V rail and fixed long timeout suffices; cannot replace MAX6420UK22+T in dual-supply systems. |
Compared with MAX6420UK22/V+T, the MAX6420UK22+T offers identical performance and footprint but omits automotive qualification - making it lower-cost for industrial prototyping. Versus TPS3808G33DBVR, it adds adjustable secondary monitoring and capacitor-tunable timing, enabling more flexible and compact multi-rail supervision.
Availability
MAX6420UK22+T is available at Aetrix Electronics and suitable for automotive body electronics, medical infusion pumps, industrial PLCs, and telematics control units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6420UK22+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.
The MAX6412–MAX6420 family delivers ultra-low-power, capacitor-programmable reset supervision for multi-rail embedded systems - specifically engineered to replace discrete reset solutions in space-constrained, high-reliability applications.
FAQ
What is the fixed reset threshold voltage of the MAX6420UK22+T?
The MAX6420UK22+T has a factory-laser-trimmed fixed VCC reset threshold of 2.200V, 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 the "22" suffix in the part number per the Reset Voltages Suffix Table.
Does the MAX6420UK22+T include a manual reset (MR) input?
No, the MAX6420UK22+T does not include a manual reset input. Per the Selector Guide and Pin Description, MAX6420 belongs to the dual-threshold subgroup (fixed + adjustable) and omits the MR pin - unlike MAX6412–MAX6414. Reset is asserted only by VCC falling below 2.2V or RESET IN falling below its programmed threshold.
How is the reset timeout period set on the MAX6420UK22+T?
The reset timeout period on the MAX6420UK22+T is set by connecting an external capacitor (CSRT) between the SRT pin and GND. The timeout follows tRP = (2.71 × 10⁶) × CSRT + 275µs, where CSRT is in farads and tRP in seconds. For example, a 1500pF capacitor yields 4.375ms typical timeout, as verified in the Electrical Characteristics table.
What is the function of the RESET IN pin on the MAX6420UK22+T?
The RESET IN pin on the MAX6420UK22+T is a high-impedance input (10nA leakage) that connects to the center node of an external resistor divider. It interfaces with the internal 1.26V reference to monitor a secondary voltage (e.g., 3.3V or 5V). When that voltage drops below the programmed threshold, the device asserts RESET - enabling true dual-voltage supervision in a single SOT23-5 package.
Is the MAX6420UK22+T compatible with AEC-Q100 automotive requirements?
The MAX6420UK22+T itself is not AEC-Q100 qualified; however, the functionally identical MAX6420UK22/V+T variant is certified to AEC-Q100 Grade 0 (–40°C to +150°C). Both share identical electrical specifications, pinout, and SOT23-5 packaging. MAX6420UK22+T is suitable for automotive design-in and pre-qualification testing, with seamless migration to /V+T for production.
MAX6420UK22+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.188V, 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
MAX6420UK22+T FAQ
1.How can I place an order for MAX6420UK22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK22+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 MAX6420UK22+T reliable?
The price and inventory of MAX6420UK22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK22+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK22+T?
MAX6420UK22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK22+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 MAX6420UK22+T?
For technical support, including MAX6420UK22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK22+T requirements.
6.How does Aetrix verify that MAX6420UK22+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK22+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 MAX6420UK22+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK22+T?
All MAX6420UK22+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK22+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 MAX6420UK22+T part is unused and in its original packaging.
Return procedure for MAX6420UK22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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