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Analog Devices Inc./Maxim Integrated MAX6419UK44-T
- Part No.:
- MAX6419UK44-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6419UK44-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
MAX6419UK44-T from Maxim Integrated is an active-high, push-pull microprocessor reset supervisor IC for dual-voltage monitoring systems. It features a factory-trimmed VCC reset threshold of 4.375V (±2.5%), an adjustable RESET IN input (1.26V threshold), capacitor-programmable reset timeout, and 1.7µA typical quiescent current. It operates across -40°C to +125°C and is used in automotive power management to ensure reliable µP initialization during brownout or dual-rail sequencing.
For engineers reviewing the MAX6419UK44-T datasheet, MAX6419UK44-T pinout, MAX6419UK44-T application, or MAX6419UK44-T equivalent, key selection criteria include its dual-threshold architecture (fixed + adjustable), guaranteed reset validity down to VCC = 1V, SOT23-5 package compatibility, and capacitor-tunable timeout for system-specific reset hold times.
Technical Context
The MAX6419UK44-T integrates two independent voltage-monitoring comparators: one laser-trimmed for VCC at 4.375V and another with a fixed 1.26V reference for externally resistor-divided voltages (e.g., 1.8V, 2.5V, 3.3V rails). Reset assertion occurs if either monitored voltage falls below its threshold or the manual reset (MR) pin is asserted.
Its reset timeout is set by an external capacitor on the SRT pin, charged by a 240nA internal current source to a 0.65V ramp threshold; deassertion occurs after the capacitor ramps to that voltage. The active-high push-pull RESET output drives high with VOH ≥ 0.8×VCC (at ISOURCE = 800µA) and low with VOL ≤ 0.4V (at ISINK = 3.2mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 4.375V ±2.5% - factory-laser-trimmed for precise 4.3V rail supervision |
| RESET IN Threshold | 1.26V ±33mV - enables monitoring of secondary rails (e.g., 1.8V via R-divider) |
| Quiescent Current | 1.7µA typ - supports ultra-low-power battery-backed systems |
| Reset Timeout Range | 275µs to >6ms - programmable via 0–1500pF capacitor on SRT pin |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial environments |
| RESET Output Type | Active-high push-pull - eliminates need for external pull-up; compatible with standard µP reset inputs |
| Supply Range | 1.0V to 5.5V - ensures valid reset assertion even during deep brownout |
Pinout & Package
SOT23-5 package: compact, surface-mount, thermally efficient, and RoHS-compliant. Pin 1 = RESET (active-high push-pull), Pin 2 = GND, Pin 3 = RESET IN (adjustable threshold input), Pin 4 = MR (manual reset, internal 20kΩ pullup), Pin 5 = SRT (capacitor-connected timeout control).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push-pull output | Drives µP reset pin directly; no external pull-up required; sinks 3.2mA / sources 800µA |
| 2 - GND | Ground reference | Common return path for all internal comparators and current sources |
| 3 - RESET IN | Adjustable threshold monitor input | High-impedance node for resistor-divider network; triggers reset when voltage < 1.26V |
| 4 - MR | Manual reset input | Pulled high internally (20kΩ); asserting low initiates reset for full timeout period |
| 5 - SRT | Reset timeout capacitor connection | 240nA precision current source charges external capacitor; determines reset hold time |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises primary VCC (4.375V) and secondary rail (via RESET IN resistor divider) - essential for multi-rail SoC power sequencing |
| Capacitor-adjustable timeout | Timeout programmable from 275µs to milliseconds using single external capacitor - avoids fixed-delay limitations in diverse µP boot timing requirements |
| Guaranteed reset at low VCC | Valid RESET output asserted down to VCC = 1V - ensures deterministic behavior during deep undervoltage conditions before shutdown |
| Low-leakage RESET IN | 10nA max input leakage - enables use of high-value resistors (e.g., 1MΩ+), minimizing standby current in battery-critical applications |
| Transient immunity | Immune to VCC glitches ≤50µs when overdrive is 100mV - prevents spurious resets from EMI or switching noise |
Applications
| Automotive Power Sequencing | Medical Sensor Node Supervision |
|---|---|
Use Scenario: Monitoring both 5V main supply and 3.3V microcontroller rail in ADAS domain controller during cold cranking. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-high RESET until both rails stabilize above 4.375V and 3.3V-derived threshold. Use Value: Prevents µP lockup during engine start transients by enforcing minimum reset hold time via SRT capacitor. | Use Scenario: Ensuring safe startup of portable ECG front-end ASIC powered by Li-ion (3.6V) and LDO-regulated 1.8V analog rail. IC Role / Device Role / Timing Role: Supervising VCC (4.375V threshold unused, but leveraged for margin) and 1.8V rail via RESET IN divider; asserts RESET until both are stable. Use Value: 1.7µA quiescent current extends battery life; 125°C rating supports operation near heat-generating analog circuitry. |
| Industrial PLC I/O Module | Battery-Powered IoT Gateway |
Use Scenario: Validating 24V-to-5V DC/DC output and isolated 3.3V logic rail in harsh factory environment with voltage ripple. IC Role / Device Role / Timing Role: Using RESET IN to monitor 3.3V rail while ignoring VCC (configured for higher threshold); MR pin tied to service button. Use Value: -40°C to +125°C operation ensures reliability in uncontrolled enclosures; MR debounce not required due to internal timing. | Use Scenario: Supervising coin-cell-powered BLE SoC (1.8V core) and 3.0V sensor interface rail in wireless environmental sensor. IC Role / Device Role / Timing Role: Configuring RESET IN for 1.8V rail and VCC for 3.0V rail; SRT capacitor set for 200ms timeout to cover slow crystal startup. Use Value: Capacitor-programmable delay replaces multiple fixed-reset ICs; open-drain alternatives excluded due to need for active-high drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK44-T | Same dual-threshold architecture and 4.375V VCC threshold, but features open-drain RESET output instead of push-pull | Requires external pull-up resistor; suitable only where level-shifting or wired-OR reset buses are needed | Select MAX6420UK44-T only if system requires open-drain reset signaling or interfacing to non-5V logic domains |
| TPS3808G33DBVR | Fixed 3.3V VCC threshold only; no adjustable RESET IN input; 350ms fixed timeout (non-adjustable) | Lacks dual-voltage capability and timeout flexibility; designed for single-rail 3.3V systems | Choose TPS3808G33DBVR only for cost-sensitive, single-supply applications where adjustable timeout and secondary rail monitoring are unnecessary |
Compared with MAX6419UK44-T, MAX6420UK44-T trades push-pull drive for open-drain flexibility but adds board-level components, while TPS3808G33DBVR sacrifices dual-monitoring and programmability for lower unit cost in simpler 3.3V-only designs.
Availability
MAX6419UK44-T is available at Aetrix Electronics and suitable for automotive power sequencing, medical sensor node supervision, industrial PLC I/O modules, and battery-powered IoT gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6419UK44-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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 family was designed specifically for low-power, high-accuracy microprocessor reset supervision in multi-rail systems where flexible timeout and dual-voltage monitoring are critical - addressing gaps in legacy fixed-threshold supervisors.
FAQ
What is the exact VCC reset threshold voltage for MAX6419UK44-T?
The MAX6419UK44-T has a factory-laser-trimmed VCC reset threshold of 4.375V, with guaranteed accuracy of ±2.5% over the full -40°C to +125°C operating range. This value corresponds to the "44" suffix in the part number per Maxim's Reset Voltages Suffix Table. The threshold is fixed and not user-adjustable.
How do I configure MAX6419UK44-T to monitor a 2.5V rail in addition to VCC?
To monitor a 2.5V rail, connect it to the RESET IN pin through a resistor divider that scales 2.5V down to 1.26V - the internal reference threshold. Use R2 = 1MΩ and calculate R1 = R2 × (2.5V / 1.26V − 1) ≈ 984kΩ. The MAX6419UK44-T asserts reset if either VCC drops below 4.375V or the divided voltage at RESET IN falls below 1.26V.
Does MAX6419UK44-T require an external pull-up resistor on the RESET pin?
No. The MAX6419UK44-T features an active-high push-pull RESET output, meaning it actively drives HIGH (up to 0.8×VCC) and LOW (≤0.4V) without needing an external pull-up. This simplifies PCB layout and reduces BOM count compared to open-drain alternatives like MAX6420UK44-T.
What capacitor value sets a 500ms reset timeout for MAX6419UK44-T?
Using the formula tRP = (2.71 × 10⁶) × CSRT + 275µs, a 500ms timeout requires CSRT = (0.5 − 0.000275) / 2.71×10⁶ ≈ 183nF. A standard 180nF ceramic capacitor (low-leakage, X7R/C0G) is recommended. Ensure minimal stray capacitance on the SRT trace for timing accuracy.
Is MAX6419UK44-T qualified for automotive applications?
The MAX6419UK44-T is specified from -40°C to +125°C and built on Maxim's BiCMOS process, meeting AEC-Q100 stress test requirements for temperature range and reliability. While not explicitly marked "/V" (automotive grade), its full-spec operation across this extended range makes it suitable for under-hood and infotainment applications where automotive qualification is functionally required.
MAX6419UK44-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:
- 4.375V, Adj
- 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-23-5
MAX6419UK44-T FAQ
1.How can I place an order for MAX6419UK44-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6419UK44-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 MAX6419UK44-T reliable?
The price and inventory of MAX6419UK44-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6419UK44-T is usually 5 days.
3.What payment methods are accepted for MAX6419UK44-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6419UK44-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6419UK44-T?
MAX6419UK44-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6419UK44-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 MAX6419UK44-T?
For technical support, including MAX6419UK44-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6419UK44-T requirements.
6.How does Aetrix verify that MAX6419UK44-T is sourced from the original manufacturer or authorized distributors?
All MAX6419UK44-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 MAX6419UK44-T meets industry standards.
7.What is the process for return or replacement of MAX6419UK44-T?
All MAX6419UK44-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6419UK44-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 MAX6419UK44-T part is unused and in its original packaging.
Return procedure for MAX6419UK44-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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