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Analog Devices Inc./Maxim Integrated MAX6418UK26
- Part No.:
- MAX6418UK26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK26.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,809
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Product details
Overview
MAX6418UK26 from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (2.625V ±2.5%) and one adjustable RESET IN input (1.26V threshold) for monitoring secondary supply rails. It features an active-low push-pull RESET output, capacitor-adjustable reset timeout (275µs to 5.75ms), manual reset capability via MR pin, and operates across -40°C to +125°C in SOT23-5. It is used in automotive ECUs to ensure reliable μP reset during dual-rail brownout events.
For engineers reviewing the MAX6418UK26 datasheet, MAX6418UK26 pinout, MAX6418UK26 application, or MAX6418UK26 equivalent, key selection considerations include its dual-threshold architecture, 1.7µA typical quiescent current at 1.8V, guaranteed RESET validity down to VCC = 1V, and AEC-Q100 qualification for automotive use.
Technical Context
The MAX6418UK26 integrates two independent reset comparators: one laser-trimmed bandgap reference comparator for VCC (2.625V nominal) and one precision 1.26V reference comparator for the external RESET IN pin. Reset assertion occurs if either voltage falls below its respective threshold or the MR pin is pulled low.
Reset deassertion is controlled by an internal 240nA current source charging an external capacitor on the SRT pin; the resulting ramp must reach 0.65V to end the timeout period. The active-low push-pull RESET output drives logic-compatible loads up to 3.2mA sink at VCC ≥ 4.5V with VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±2.5% (factory-laser-trimmed; enables precise power-rail monitoring without external components) |
| RESET IN Threshold | 1.26V ±33mV hysteresis (fixed internal reference; supports external resistor-divider for custom VMON_TH from 1.26V upward) |
| Quiescent Current | 1.7µA typ at VCC ≤ 2.0V (enables >10-year battery life in always-on automotive sensors) |
| Reset Timeout Range | 275µs to 5.75ms (set by 0–1500pF capacitor on SRT; covers μP power-up timing from fast MCUs to legacy processors) |
| Operating Temperature | -40°C to +125°C (fully specified for under-hood automotive environments) |
| RESET Output Type | Active-low push-pull (drives standard CMOS μP reset inputs directly; no pull-up required) |
| AEC-Q100 Qualified | Yes (Grade 0 / Grade 1 per ordering suffix; validated for automotive safety-critical systems) |
Pinout & Package
SOT23-5 package: 5-pin surface-mount, 1.6mm × 2.9mm footprint, 1.1mm height, lead-free (RoHS-compliant) or leaded options available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives μP reset pin directly; sinks 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V; valid for VCC ≥ 1V |
| 2 - GND | Ground reference | Common return path for all internal circuits; requires low-impedance connection to system ground plane |
| 3 - RESET IN | Adjustable reset input | High-impedance (10nA leakage) comparator input referenced to 1.26V; accepts external resistor-divider for dual-rail monitoring |
| 4 - SRT | Set reset timeout input | Connects to external capacitor (0–1500pF); 240nA internal current source sets tRP = 2.71×10⁶×CSRT + 275µs |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Power input (1.0–5.5V) and input to laser-trimmed 2.625V reset comparator; guarantees RESET validity down to 1V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.625V) and external rail (via RESET IN + divider); prevents μP lockup when either rail fails |
| Capacitor-adjustable timeout | Eliminates need for fixed-delay ICs or RC networks; supports design reuse across multiple μP families with varying reset timing requirements |
| Low quiescent current | 1.7µA typical at 1.8V enables integration into always-on automotive modules without compromising battery drain budgets |
| Manual reset input (MR) | Internal 20kΩ pullup allows momentary switch-to-ground implementation; no external components needed for field service reset |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs at 100mV overdrive; prevents spurious resets during ECU load-dump or ignition transients |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V main logic rail and 3.3V sensor interface rail in engine control module exposed to wide temperature and voltage transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RESET to ARM Cortex-M7 MCU upon any rail dropout or manual service trigger. Use Value: Prevents corrupted firmware execution during cold-crank (VCC dip to 2.4V) while maintaining independent validation of 3.3V sensor rail integrity. |
Use Scenario: Ensures fail-safe restart of safety-critical pump controller after battery swap or power interruption in portable medical device. IC Role / Device Role / Timing Role: Supervises 3.6V Li-ion supply and 1.8V analog front-end rail; generates 4.375ms reset pulse synchronized to VCC recovery. Use Value: Guarantees deterministic μP initialization before motor driver activation, eliminating risk of uncontrolled fluid delivery. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
Use Scenario: Embedded in DIN-rail mounted PLC module operating in factory environments with 24V DC input and internal 5V/3.3V conversion. IC Role / Device Role / Timing Role: Monitors post-regulator 5V rail and isolated 3.3V communication rail; uses MR pin for remote diagnostics-triggered reset. Use Value: Enables hot-swap recovery without full system reboot; maintains watchdog timer continuity during brief 5V dips caused by relay switching. |
Use Scenario: Integrated into LTE-connected vehicle telematics unit requiring simultaneous supervision of AP processor core (1.1V), memory (1.2V), and modem (3.8V) rails. IC Role / Device Role / Timing Role: Uses RESET IN divider to monitor 3.8V modem rail while VCC pin supervises 1.2V memory rail; asserts RESET to SoC upon first fault. Use Value: Reduces BOM count by replacing two single-rail supervisors; simplifies layout with shared SRT capacitor and MR signal routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK29-T | VCC threshold = 2.925V ±2.5%; identical pinout, timing, and dual-monitoring architecture | Targeted at systems with higher 3.3V rail tolerance; less margin for 3.3V brownout detection | Select when primary rail is 3.3V ±5% and tighter VTH accuracy at that level is required |
| TLV809E26DBVR | Single fixed-threshold (2.63V) supervisor; no adjustable RESET IN, no MR pin, open-drain output, 0.8µA IQ | Lacks dual-rail capability and manual reset; requires external pull-up; suited only for basic VCC-only monitoring | Choose only for cost-sensitive, single-rail applications where RESET IN functionality is unnecessary |
Compared with MAX6418UK29-T, the MAX6418UK26 offers lower VCC threshold margin for 2.5V/3.3V mixed systems; compared with TLV809E26DBVR, it adds essential dual-rail supervision, MR input, and push-pull drive-making it irreplaceable in automotive and medical dual-supply designs.
Availability
MAX6418UK26 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 MAX6418UK26 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 reliability, low power, and high integration.
The MAX6412–MAX6420 product line delivers ultra-low-power, capacitor-programmable reset supervisors optimized for dual-rail microprocessor systems in harsh environments-including AEC-Q100 qualified variants for automotive safety-critical functions.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK26?
The MAX6418UK26 has a factory-laser-trimmed VCC reset threshold of 2.625V, with ±2.5% tolerance over -40°C to +125°C. This value is confirmed in Table 1 of the datasheet (suffix "26") and is guaranteed by production testing-not derived from typical curves or interpolation. The MAX6418UK26 uses this precise threshold to supervise 2.5V or 3.3V rails with defined brownout margins.
Does MAX6418UK26 support manual reset functionality?
Yes, the MAX6418UK26 includes a dedicated MR (manual reset) input on pin 3. Pulling MR low asserts RESET for the full timeout period, even if VCC and RESET IN remain above threshold. An internal 20kΩ pullup resistor allows the pin to be left floating when unused. This feature is explicitly documented in the Pin Description and Manual Reset Input sections of the MAX6418UK26 datasheet.
What is the minimum VCC voltage at which MAX6418UK26 guarantees valid RESET output?
The MAX6418UK26 guarantees valid RESET output down to VCC = 1.0V. Below this, sink capability degrades significantly. This specification is stated in the "Guaranteed Reset Valid to VCC = 1V" feature bullet and verified in Electrical Characteristics (VOL test conditions begin at VCC ≥ 1.0V). For operation below 1V, external pulldown is required-per the "Ensuring a Valid RESET…" section of the MAX6418UK26 datasheet.
Can MAX6418UK26 monitor a 1.8V rail using the RESET IN pin?
Yes, the MAX6418UK26 RESET IN pin has a fixed 1.26V threshold and supports external resistor dividers to monitor voltages ≥1.26V. To supervise a 1.8V rail, configure R1 and R2 such that VMON_TH = 1.26V × (R1 + R2)/R2 = 1.8V (e.g., R2 = 1MΩ, R1 ≈ 429kΩ). This method is fully detailed in the Reset Threshold section and Figure 1 of the MAX6418UK26 datasheet.
Is MAX6418UK26 qualified for automotive applications?
Yes-MAX6418UK26 is offered in AEC-Q100 qualified versions (denoted by /V suffix, e.g., MAX6418UK26/V+T). While the base MAX6418UK26 part is rated for -40°C to +125°C and meets automotive temperature requirements, formal AEC-Q100 qualification requires the /V variant. This distinction is clearly stated in the Ordering Information and Selector Guide sections of the MAX6418UK26 datasheet.
MAX6418UK26 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:
- 2.625V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6418UK26 FAQ
1.How can I place an order for MAX6418UK26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK26 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 MAX6418UK26 reliable?
The price and inventory of MAX6418UK26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK26 is usually 5 days.
3.What payment methods are accepted for MAX6418UK26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK26?
MAX6418UK26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK26 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 MAX6418UK26?
For technical support, including MAX6418UK26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK26 requirements.
6.How does Aetrix verify that MAX6418UK26 is sourced from the original manufacturer or authorized distributors?
All MAX6418UK26 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 MAX6418UK26 meets industry standards.
7.What is the process for return or replacement of MAX6418UK26?
All MAX6418UK26 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK26, 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 MAX6418UK26 part is unused and in its original packaging.
Return procedure for MAX6418UK26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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