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Analog Devices Inc./Maxim Integrated MAX6418UK46+
- Part No.:
- MAX6418UK46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK46+.pdf
- Description:
- MAX6418 LOW-POWER, DUAL-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:2,247
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Product details
Overview
MAX6418UK46+ from Maxim Integrated is a low-power, dual-voltage microprocessor reset supervisor IC with one factory-trimmed VCC reset threshold (4.625V typical) and one adjustable RESET IN input for monitoring secondary voltages down to 1.26V. It features an active-low push-pull RESET output, capacitor-adjustable reset timeout delay (275µs to >100ms), manual reset capability via MR pin, and operates across -40°C to +125°C in automotive-grade SOT23-5 packaging. It is used in battery-powered controllers and embedded systems requiring robust brownout detection.
For engineers reviewing the MAX6418UK46+ datasheet, MAX6418UK46+ pinout, MAX6418UK46+ application, or MAX6418UK46+ equivalent, key selection criteria include its dual-threshold architecture, guaranteed RESET validity down to VCC = 1V, 1.7µA quiescent current, and SRT-capacitor programmability for precise timeout tuning in critical µP power-up sequencing.
Technical Context
The MAX6418UK46+ integrates two independent voltage-monitoring comparators: one laser-trimmed for VCC at 4.625V (±2.5% over temperature), and one adjustable comparator referenced to 1.26V on the RESET IN pin, enabling external resistor-divider configuration for secondary rail monitoring. Reset assertion occurs if either VCC or RESET IN falls below its respective threshold, or if MR is pulled low.
Reset deassertion is delayed by a precision 240nA current source charging an external capacitor (CSRT) connected to SRT, with a base delay of 275µs plus (2.71×10⁶)×CSRT seconds. The active-low push-pull RESET output drives logic-compatible loads directly without pull-up resistors and remains valid for VCC ≥ 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V typical (suffix "46"), ±2.5% accuracy over -40°C to +125°C - ensures reliable detection of 5V rail brownout before µP malfunction |
| RESET IN Threshold | 1.26V fixed internal reference - enables monitoring of secondary rails (e.g., 3.3V, 2.5V) using external resistor divider |
| Quiescent Current | 1.7µA typical at +25°C - supports multi-year battery life in portable and remote sensing applications |
| Reset Timeout Range | 275µs minimum + up to >100ms via CSRT (0–15nF) - configurable for diverse µP reset timing requirements |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up, simplifies interface to µP reset input with fast rise/fall times |
| VCC Validity Limit | RESET guaranteed valid down to VCC = 1V - ensures deterministic reset behavior during deep brownout conditions |
Pinout & Package
SOT23-5 package: ultra-compact, surface-mount, lead-free (RoHS-compliant), thermal resistance θJA = 140°C/W, footprint compatible with standard 5-pin SOT-23 land pattern (Maxim land pattern #90-0174).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset input directly; sinks 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V); no external pull-up required |
| 2 - GND | Ground reference | Primary return path for internal comparators, current source, and output stage; must be low-impedance |
| 3 - RESET IN | Adjustable reset threshold input | High-impedance node (10nA leakage) for external resistor-divider; sets secondary rail trip point via 1.26V reference |
| 4 - MR | Manual reset input | Active-low; internally pulled up to VCC (20kΩ); asserts reset when pulled to GND; debounced by timeout capacitor |
| 5 - SRT | Set reset timeout input | Connects to external timing capacitor; hosts precision 240nA ramp current source - trace routing must minimize stray capacitance/leakage |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises primary VCC (4.625V) and secondary rail (via RESET IN) - essential for multi-rail SoC or FPGA power sequencing |
| Capacitor-adjustable timeout | External CSRT sets exact reset hold time (275µs + 2.71×10⁶×CSRT) - replaces fixed-delay ICs and avoids firmware dependency |
| Low-power operation | 1.7µA supply current enables always-on supervision in energy-constrained devices without compromising battery runtime |
| Automotive temperature range | Full -40°C to +125°C operation with guaranteed parametric performance - meets AEC-Q100 stress test requirements for Grade 1 |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs when overdriven by 100mV - prevents spurious resets during switching noise or load transients |
Applications
| Automotive Body Control Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V MCU core rail in a CAN-connected body control unit exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET until both rails stabilize post-cold crank; timeout set to 20ms for safe µP boot. Use Value: Prevents erratic CAN messaging or EEPROM corruption during voltage sag by guaranteeing synchronized reset across dual supplies. | Use Scenario: Ensures fail-safe restart of safety-critical ARM-based controller after battery swap or low-battery brownout in portable infusion hardware. IC Role / Device Role / Timing Role: Primary reset generator with MR support for technician-initiated recalibration; timeout configured for 100ms to accommodate slow LDO settling. Use Value: Eliminates risk of motor runaway or dosage miscalculation by enforcing full µP reinitialization before therapy resumption. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Supervises isolated 24V-to-5V DC/DC output and 1.8V FPGA configuration rail in DIN-rail mounted automation hardware. IC Role / Device Role / Timing Role: Dual-input supervisor detecting undervoltage on either rail; RESET held for 50ms to allow FPGA configuration completion. Use Value: Avoids partial configuration lockup or I/O misbehavior by ensuring both power domains meet thresholds before releasing reset. | Use Scenario: Provides tamper-resistant power-on reset for metrology SoC operating from supercapacitor backup during AC mains failure. IC Role / Device Role / Timing Role: Low-ICC supervisor maintaining vigilance during 10-year battery life; timeout set to 10ms for rapid recovery from brief outages. Use Value: Guarantees accurate kWh accumulation resumes immediately post-outage without data loss or calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6419UK46+ | Identical VCC threshold (4.625V) and dual-monitoring function, but features active-high push-pull RESET output | Requires µP with active-high reset input; incompatible with active-low-only designs without level-shifting | Select when system reset logic expects high-valid assertion and board layout allows signal polarity change |
| TPS3808G33DBVR | Single-threshold (3.3V) supervisor with fixed 200ms timeout; no adjustable RESET IN or dual-monitoring capability | Lacks secondary rail monitoring; suitable only for single-rail systems; higher ICC (12µA) | Choose only for cost-sensitive, single-supply applications where dual monitoring is unnecessary |
Compared with MAX6418UK46+, MAX6419UK46+ offers identical dual-voltage supervision but inverted RESET polarity, while TPS3808G33DBVR provides simpler single-rail supervision at higher quiescent current and without adjustable timeout or secondary rail support - making MAX6418UK46+ uniquely suited for complex multi-rail, low-power, automotive-grade designs.
Availability
MAX6418UK46+ is available at Aetrix Electronics and suitable for automotive body control modules, medical infusion pump controllers, industrial PLC I/O modules, smart energy meter MCUs, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges.
Supply support for MAX6418UK46+ 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 industrial, automotive, and computing markets.
The MAX6412–MAX6420 product line delivers ultra-low-power, capacitor-programmable reset supervisors optimized for dual-rail systems in harsh environments - designed specifically for reliability-critical applications where voltage margin, temperature stability, and long-term supply continuity are paramount.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK46+?
The MAX6418UK46+ has a factory-trimmed VCC reset threshold of 4.625V (typical), with ±2.5% tolerance over the full -40°C to +125°C operating range. This value corresponds to the "46" suffix per Maxim's Reset Voltages Suffix Table (Table 1), and is laser-trimmed during production for high accuracy without external calibration. The MAX6418UK46+ uses this fixed threshold to monitor the primary supply rail while simultaneously supervising a secondary rail via its adjustable RESET IN input.
How do I configure the reset timeout period for MAX6418UK46+?
To configure the reset timeout period for MAX6418UK46+, connect a low-leakage ceramic capacitor (CSRT) between the SRT pin (Pin 5) and GND. The timeout tRP (in seconds) is calculated as tRP = (2.71 × 10⁶) × CSRT + 275µs. For example, a 10nF capacitor yields ~27.4ms. CSRT must be <10nA leakage; ceramic is recommended. Layout best practices require short, isolated SRT traces to avoid stray capacitance that would lengthen the timeout beyond specification.
Does MAX6418UK46+ support manual reset functionality?
Yes, MAX6418UK46+ supports manual reset via the MR pin (Pin 4), which is internally pulled up to VCC with a 20kΩ resistor. Asserting MR low initiates a reset, and the RESET output remains active for the full capacitor-programmed timeout period after MR is released. Unlike MAX6412–MAX6414 variants, MAX6418UK46+ does not include a dedicated manual reset comparator - instead, MR directly triggers the same reset logic used for VCC/RESET IN faults, ensuring consistent timing behavior across all reset sources.
Can MAX6418UK46+ monitor a 3.3V rail as the secondary voltage?
Yes, MAX6418UK46+ can monitor a 3.3V rail using its RESET IN pin (Pin 3). Connect the rail to a resistor divider referenced to the internal 1.26V threshold: for 3.3V, use R1 = 1.62MΩ and R2 = 1MΩ (VMON_TH = 1.26V × (R1 + R2)/R2). The MAX6418UK46+'s high-impedance RESET IN input (10nA leakage) minimizes divider current, preserving efficiency. This dual-monitoring capability allows simultaneous supervision of both the 4.625V VCC rail and the 3.3V secondary rail - a key feature distinguishing MAX6418UK46+ from single-threshold alternatives.
What is the minimum VCC voltage at which MAX6418UK46+ guarantees valid RESET output?
MAX6418UK46+ guarantees valid RESET output down to VCC = 1V. Below this voltage, the output driver strength declines significantly, risking indeterminate logic levels at the µP reset input. For applications requiring valid RESET down to VCC = 0V, Maxim recommends adding a 100kΩ pulldown resistor between RESET and GND - a solution validated in the MAX6418UK46+ datasheet (Figure 6). This ensures the µP remains held in reset even during deep brownout or complete power collapse.
MAX6418UK46+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 3ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6418UK46+ FAQ
1.How can I place an order for MAX6418UK46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK46+ 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 MAX6418UK46+ reliable?
The price and inventory of MAX6418UK46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK46+ is usually 5 days.
3.What payment methods are accepted for MAX6418UK46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK46+?
MAX6418UK46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK46+ 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 MAX6418UK46+?
For technical support, including MAX6418UK46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK46+ requirements.
6.How does Aetrix verify that MAX6418UK46+ is sourced from the original manufacturer or authorized distributors?
All MAX6418UK46+ 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 MAX6418UK46+ meets industry standards.
7.What is the process for return or replacement of MAX6418UK46+?
All MAX6418UK46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK46+, 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 MAX6418UK46+ part is unused and in its original packaging.
Return procedure for MAX6418UK46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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