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Analog Devices Inc./Maxim Integrated MAX6420UK16+T
- Part No.:
- MAX6420UK16+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK16+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,352
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Product details
Overview
MAX6420UK16+T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (1.575V nominal) and one adjustable RESET IN input for monitoring secondary voltages down to 1.26V. It features an active-low open-drain RESET output, capacitor-adjustable reset timeout (275µs to 5.75ms), manual reset capability via external switch, and guaranteed operation from -40°C to +125°C in SOT23-5 package. It is used in automotive power management systems to ensure reliable µP reset during brownout and dual-rail sequencing.
For engineers reviewing the MAX6420UK16+T datasheet, MAX6420UK16+T pinout, MAX6420UK16+T application, or MAX6420UK16+T equivalent, key selection considerations include its dual-threshold architecture, open-drain logic compatibility with mixed-supply µPs, AEC-Q100 qualification (via /V suffix variants), 1.7µA typical quiescent current, and SRT pin's 240nA precision ramp current for accurate timeout setting.
Technical Context
The MAX6420UK16+T implements dual independent voltage monitoring: a laser-trimmed internal comparator for VCC (1.575V ±2.5% over temperature) and an external resistor-divider–based adjustable comparator on RESET IN (threshold set by 1.26V reference). Reset assertion occurs if either voltage falls below its respective threshold or MR is pulled low.
Its open-drain RESET output supports logic-level translation across supply domains (0–5.5V pull-up), while the SRT pin uses a 240nA constant-current source charging an external capacitor to generate a programmable timeout delay; deassertion requires the SRT voltage to reach 0.65V with 33mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.575V (nominal), ±2.5% over -40°C to +125°C - ensures reliable power-on reset at 1.6V system rails |
| RESET IN Threshold | 1.26V fixed reference - enables monitoring of secondary voltages ≥1.26V using external resistive divider |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - provides flexible delay tuning for diverse µP reset timing requirements |
| Quiescent Current | 1.7µA (typ) at VCC ≤ 2.0V - minimizes battery drain in always-on automotive and portable applications |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive and industrial embedded environments |
| Output Type | Active-low open-drain - allows wired-OR configuration and interface to µPs with different supply voltages |
| 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, 90-0174 land pattern), 5-pin surface-mount, RoHS-compliant (+T suffix), 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 µP reset input low; requires external pull-up to compatible logic rail (0–5.5V); sinks 500µA min at VCC ≥ 2.7V |
| 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 threshold input | High-impedance node (10nA leakage) for external resistor divider; sets secondary voltage monitor threshold via 1.26V internal reference |
| 4 - SRT | Set reset timeout input | 240nA precision current source charges external capacitor; timeout determined by time to reach 0.65V threshold with 33mV hysteresis |
| 5 - VCC | Supply and primary voltage monitor input | Powers device and feeds internal 1.575V threshold comparator; valid operation down to 1.0V; reset asserted if VCC < 1.575V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main VCC (1.575V) and secondary rail (adjustable ≥1.26V) - eliminates need for two discrete supervisors in multi-rail systems |
| Capacitor-programmable reset timeout | 275µs–5.75ms range via single external capacitor on SRT - replaces fixed-delay ICs and avoids firmware-based timing dependencies |
| Open-drain RESET with wide voltage compatibility | Supports pull-up to any rail from 0V to 5.5V - enables direct interfacing to 1.8V, 3.3V, or 5V µPs without level shifters |
| Guaranteed reset validity to VCC = 1V | RESET remains functional and well-defined even during severe brownout - critical for fail-safe behavior in automotive ECUs |
| Low-leakage RESET IN input | 10nA max input leakage - permits use of high-value resistors (e.g., 1MΩ/10MΩ) in voltage dividers, minimizing standby current |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V microcontroller supply and 3.3V sensor interface rail during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to ARM Cortex-M4 µP until both rails stabilize above thresholds. Use Value: Prevents code execution errors during transient brownout by holding µP in reset until both supplies meet timing and voltage criteria. |
Use Scenario: Ensures safe startup and fault recovery in battery-powered infusion pump with separate 3.3V MCU and 2.5V analog front-end rails. IC Role / Device Role / Timing Role: Supervises main VCC and adjustable analog rail; generates 4.375ms reset pulse (CSRT = 1500pF) compliant with IEC 60601-1 power-on timing. Use Value: Guarantees deterministic state initialization after battery insertion or low-battery recovery, meeting medical safety certification requirements. |
| Industrial PLC I/O Module | Automotive ADAS Camera ECU |
Use Scenario: Detects undervoltage on isolated 24V-to-5V DC-DC output and 5V-to-3.3V LDO output in harsh factory environments. IC Role / Device Role / Timing Role: Uses RESET IN to monitor secondary 3.3V rail via resistor divider; asserts open-drain RESET to FPGA configuration controller. Use Value: Enables single-chip supervision of cascaded power stages, reducing BOM count and PCB area versus discrete solutions. |
Use Scenario: Provides fail-safe reset during camera module power sequencing where 12V input, 5V image sensor, and 1.2V SoC rails must meet strict timing windows. IC Role / Device Role / Timing Role: Factory-trimmed VCC threshold monitors 5V rail; adjustable RESET IN tracks 1.2V core rail; SRT capacitor sets 3.0ms timeout per ISO 26262 ASIL-B timing constraints. Use Value: Meets automotive functional safety requirements by ensuring µP reset duration exceeds worst-case power rail stabilization time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK16+T | Active-low push-pull RESET output; no open-drain capability | Requires same-supply pull-up; incompatible with mixed-voltage bus architectures | Select when µP reset input accepts only active-low push-pull drive and no level translation is needed |
| TPS3808G16DBVR | Fixed 1.6V VDD threshold only; no adjustable RESET IN input; 200ms min timeout (non-adjustable) | Lacks dual-rail monitoring; unsuitable for systems requiring secondary voltage supervision | Choose only for single-rail applications where programmable timeout is unnecessary and cost is prioritized over flexibility |
Compared with MAX6420UK16+T, MAX6418UK16+T offers identical dual-monitoring functionality but lacks open-drain flexibility, while TPS3808G16DBVR sacrifices adjustability and dual-threshold capability for lower unit cost in simpler designs.
Availability
MAX6420UK16+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK16+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, emphasizing reliability, low power, and high integration.
The MAX6412–MAX6420 family was engineered specifically for robust µP reset supervision in multi-rail embedded systems, combining dual-threshold monitoring, capacitor-adjustable timing, and AEC-Q100–ready performance in ultra-small packages.
FAQ
What is the exact VCC reset threshold voltage for MAX6420UK16+T?
The MAX6420UK16+T has a factory-trimmed VCC reset threshold of 1.575V (nominal), with tolerance of ±1.25% at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value corresponds to the "16" suffix in the part number per Table 1 of the datasheet, and is laser-trimmed for accuracy without requiring external calibration.
How do I calculate the external capacitor value for a 4.0ms reset timeout with MAX6420UK16+T?
Use the formula CSRT = (tRP − 275µs) / 2.71 × 10⁶, where tRP = 4.0ms = 0.004s. Substituting gives CSRT = (0.004 − 0.000275) / 2,710,000 ≈ 1375pF. A standard 1500pF ceramic capacitor yields 4.375ms (within datasheet spec), making it a practical choice for 4ms targeting with margin.
Does MAX6420UK16+T support manual reset functionality, and how is it implemented?
Yes, MAX6420UK16+T supports manual reset via the RESET IN pin: connect a normally open momentary switch between RESET IN and ground. Closing the switch pulls RESET IN to 0V, triggering reset assertion. Reset remains active for the full timeout period after switch release, eliminating need for external debounce circuitry due to the built-in timing control.
Can MAX6420UK16+T monitor a 2.5V rail as the secondary voltage, and what resistor values are recommended?
Yes, MAX6420UK16+T can monitor a 2.5V rail using its adjustable RESET IN input. With VRST = 1.26V, set R2 = 1MΩ and calculate R1 = 1MΩ × (2.5V / 1.26V − 1) ≈ 984kΩ. Use standard 1MΩ and 976kΩ resistors for <1% error. Total divider current is ~1.26µA, minimizing impact on rail regulation.
Is MAX6420UK16+T qualified for automotive applications, and what is its AEC-Q100 status?
The base MAX6420UK16+T is not AEC-Q100 qualified; however, the /V-suffixed variant MAX6420UK16/V+T is explicitly AEC-Q100 qualified for automotive use. Both share identical electrical specs and packaging, but only the /V version undergoes stress testing per AEC-Q100 Rev H for Grade 0 (−40°C to +150°C junction) and Grade 1 (−40°C to +125°C ambient).
MAX6420UK16+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.575V, 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
MAX6420UK16+T FAQ
1.How can I place an order for MAX6420UK16+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK16+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 MAX6420UK16+T reliable?
The price and inventory of MAX6420UK16+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK16+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK16+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK16+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK16+T?
MAX6420UK16+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK16+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 MAX6420UK16+T?
For technical support, including MAX6420UK16+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK16+T requirements.
6.How does Aetrix verify that MAX6420UK16+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK16+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 MAX6420UK16+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK16+T?
All MAX6420UK16+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK16+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 MAX6420UK16+T part is unused and in its original packaging.
Return procedure for MAX6420UK16+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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