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Analog Devices Inc./Maxim Integrated MAX6420UK17+T
- Part No.:
- MAX6420UK17+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK17+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,649
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Product details
Overview
The MAX6420UK17+T from Maxim Integrated is a low-power microprocessor supervisor IC with dual-voltage monitoring capability, featuring a factory-trimmed 1.665V fixed VCC reset threshold (suffix '17'), an adjustable RESET IN input for monitoring secondary voltages down to 1.26V, and an active-low open-drain RESET output. It operates from -40°C to +125°C in a SOT23-5 package and uses an external capacitor on the SRT pin to set a programmable reset timeout period-ideal for automotive and battery-powered embedded controllers requiring precise brownout protection.
For engineers reviewing the MAX6420UK17+T datasheet, MAX6420UK17+T pinout, MAX6420UK17+T application, or MAX6420UK17+T equivalent, key selection criteria include its dual-threshold architecture (fixed + adjustable), 1.7μA typical quiescent current, guaranteed RESET validity down to VCC = 1V, open-drain logic compatibility with multiple supply rails, and AEC-Q100 qualification for automotive use.
Technical Context
The MAX6420UK17+T implements dual independent voltage monitoring: one internal bandgap-referenced comparator for VCC (1.665V ±2.5% over temperature), and a high-impedance adjustable comparator on RESET IN (1.26V threshold) that accepts external resistor dividers to monitor secondary supplies. Reset assertion occurs if either voltage falls below its respective threshold or if the manual reset function is enabled via external switch across R2.
Its reset timeout is generated by a precision 240nA current source charging an external capacitor (CSRT) to a 0.65V internal reference; deassertion occurs only after the ramp reaches this level, ensuring immunity to short transients. The open-drain RESET output supports pull-up to any rail ≤5.5V, enabling flexible interfacing with diverse μP logic families without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 1.665V (±2.5% over -40°C to +125°C); ensures reliable power-on reset for 1.8V systems with margin |
| Adjustable Input Threshold | 1.26V (±33mV hysteresis); enables monitoring of secondary rails like 3.3V, 5V, or custom voltages via resistor divider |
| Quiescent Current | 1.7μA (typ at VCC ≤ 2.0V); extends battery life in portable and automotive always-on modules |
| Reset Timeout Range | 275μs to 5.75ms (with CSRT = 0F to 1500pF); configurable for μP reset timing requirements across applications |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive and industrial control environments |
| RESET Output Type | Active-low open-drain; allows wired-OR configuration and pull-up to independent logic supply (e.g., 3.3V μP with 5V system rail) |
| VCC Validity Limit | RESET guaranteed valid down to VCC = 1V; prevents undefined logic states 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 (multi-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives μP reset input low during fault; requires external pull-up; compatible with 0–5.5V logic rails |
| 2 - GND | Ground reference | Common return path for all internal comparators and current sources; must be low-impedance |
| 3 - RESET IN | Adjustable reset threshold input | High-impedance node (10nA leakage) for external resistor divider; sets secondary voltage trip point |
| 4 - SRT | Set reset timeout input | Connects to external capacitor (CSRT); 240nA precision current source charges it to 0.65V for timeout control |
| 5 - VCC | Supply and primary voltage monitor input | Powers device and feeds fixed-threshold comparator; monitors main system rail (1.0–5.5V range) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (1.665V) and external rail via RESET IN-enables single-chip protection for multi-rail systems like 1.8V core + 3.3V I/O |
| Capacitor-programmable timeout | External CSRT sets delay from 275μs to >5ms; eliminates need for fixed-delay ICs or RC networks with poor temp stability |
| Open-drain RESET output | Supports mixed-voltage designs: pull-up to 1.8V, 3.3V, or 5V independently of VCC-no level translators required |
| AEC-Q100 qualified | Validated for automotive applications per Grade 0 (-40°C to +125°C); includes stress testing for reliability in harsh environments |
| Low-power operation | 1.7μA typical ICC at VCC ≤ 2.0V; reduces standby current in battery-backed systems and telematics modules |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 1.8V microcontroller supply and 5V analog sensor rail in engine management systems exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to ARM Cortex-M7 during VCC brownout or 5V sensor rail collapse; timeout set to 4.375ms for safe firmware reload. Use Value: Prevents erratic ECU behavior during cranking or load dump; AEC-Q100 qualification ensures compliance with ISO 16750-2. | Use Scenario: Ensures deterministic restart of safety-critical pump controller after battery voltage sag during motor startup or wireless data transmission. IC Role / Device Role / Timing Role: Supervises main 3.3V logic rail and backup 1.8V real-time clock domain; RESET asserted until both rails stabilize above thresholds. Use Value: Guarantees fail-safe shutdown and recovery within 5ms-meets IEC 62304 Class C software safety requirements. |
| Industrial PLC I/O Module | Portable Test Equipment |
Use Scenario: Protects FPGA-based I/O interface operating from 2.5V and 12V isolated supplies in factory automation cabinets with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 12V auxiliary rail via resistor divider while VCC tracks 2.5V FPGA core; open-drain RESET pulled to 2.5V. Use Value: Eliminates need for two separate supervisors; reduces BOM count and PCB area in space-constrained DIN-rail modules. | Use Scenario: Maintains stable operation of handheld oscilloscope with Li-ion battery (2.8–4.2V) powering 1.2V ADC and 3.3V display controller. IC Role / Device Role / Timing Role: Fixed threshold (1.665V) supervises battery voltage; adjustable input monitors 3.3V display rail; timeout set to 275μs for fast wake-from-sleep. Use Value: Enables ultra-low-quiescent-current design (1.7μA) extending battery runtime beyond 12 hours between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK17+T | Same fixed VCC threshold (1.665V) and dual-monitoring architecture, but features active-low push-pull RESET instead of open-drain | Requires dedicated reset rail; cannot share RESET line with other open-drain devices or interface to higher-voltage logic | Select when push-pull drive strength (≥1.2mA sink) is needed and no multi-supply logic interfacing is required |
| TLV809E16DBVR | Single-threshold (1.63V), fixed-reset-time (200ms), SOT23-3 package; no adjustable input or capacitor-programmable timeout | Lacks dual-voltage capability and timeout flexibility; suitable only for basic VCC-only monitoring with fixed delay | Choose for cost-sensitive, space-constrained applications where secondary rail monitoring and precise timeout tuning are unnecessary |
Compared with MAX6418UK17+T, the MAX6420UK17+T trades push-pull drive for open-drain flexibility and multi-rail compatibility; versus TLV809E16DBVR, it adds critical dual-supply supervision, sub-millisecond timeout adjustability, and automotive-grade temperature range-justifying its use in safety-critical or multi-rail embedded systems.
Availability
MAX6420UK17+T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC I/O modules, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK17+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 product line delivers highly configurable microprocessor supervisors targeting systems needing dual-rail monitoring, capacitor-adjustable reset timing, and AEC-Q100 compliance-especially in automotive and battery-operated embedded controllers.
FAQ
What is the exact fixed reset threshold voltage of the MAX6420UK17+T?
The MAX6420UK17+T has a factory-trimmed fixed VCC reset threshold of 1.665V (typical), with tolerance of ±1.25% at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is confirmed by the '17' suffix in the part number and the Reset Voltages Suffix Table in the datasheet.
How does the MAX6420UK17+T support dual-voltage monitoring?
The MAX6420UK17+T supports dual-voltage monitoring by combining a fixed 1.665V threshold for VCC with an adjustable RESET IN input referenced to 1.26V. An external resistor divider applied to RESET IN allows precise setting of a second trip point-for example, monitoring both a 1.8V core rail and a 3.3V I/O rail simultaneously using a single MAX6420UK17+T.
What is the function of the SRT pin on the MAX6420UK17+T?
The SRT pin on the MAX6420UK17+T connects to an external capacitor (CSRT) that sets the reset timeout period. A precision 240nA current source charges CSRT to an internal 0.65V reference; the resulting ramp time determines the duration RESET remains asserted after fault clearance-ranging from 275μs (CSRT = 0F) to 5.75ms (CSRT = 1500pF).
Why does the MAX6420UK17+T use an open-drain RESET output?
The MAX6420UK17+T uses an open-drain RESET output to enable flexible logic-level interfacing: the output can be pulled up to any voltage rail (0–5.5V) independent of VCC, allowing direct connection to μPs with different I/O voltages (e.g., 1.8V FPGA core with 3.3V peripheral bus) without external level shifters or additional components.
Is the MAX6420UK17+T qualified for automotive applications?
Yes, the MAX6420UK17+T is AEC-Q100 qualified for automotive use. While the base part number does not include '/V', Maxim's Ordering Information confirms that MAX6420UK_ _/V-T and MAX6420UK_ _/V+T variants exist; the +T suffix indicates lead-free packaging, and the device is fully specified from -40°C to +125°C-meeting Grade 0 requirements for under-hood automotive electronics.
MAX6420UK17+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.665V, 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
MAX6420UK17+T FAQ
1.How can I place an order for MAX6420UK17+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK17+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 MAX6420UK17+T reliable?
The price and inventory of MAX6420UK17+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK17+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK17+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK17+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK17+T?
MAX6420UK17+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK17+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 MAX6420UK17+T?
For technical support, including MAX6420UK17+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK17+T requirements.
6.How does Aetrix verify that MAX6420UK17+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK17+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 MAX6420UK17+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK17+T?
All MAX6420UK17+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK17+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 MAX6420UK17+T part is unused and in its original packaging.
Return procedure for MAX6420UK17+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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