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Analog Devices Inc./Maxim Integrated MAX6445UK23L
- Part No.:
- MAX6445UK23L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK23L.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,644
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Product details
Overview
MAX6445UK23L from Maxim Integrated is a dual-manual-reset, fixed-threshold microprocessor supervisor IC with 2.313V VCC reset threshold, 6.72s extended manual reset setup period (L suffix), and push-pull active-low RESET output in 5-pin SOT23 package. It monitors VCC only, asserts RESET when VCC drops below threshold or when both MR1 and MR2 are held low ≥6.72s, and guarantees valid reset down to VCC = 1.0V. Used in set-top boxes and industrial equipment for reliable power-on/brownout reset control.
For engineers reviewing the MAX6445UK23L datasheet, MAX6445UK23L pinout, MAX6445UK23L application, or MAX6445UK23L equivalent, key selection criteria include its dual extended-setup manual reset architecture, 2.313V fixed threshold, 6.72s tMR timing, push-pull output logic, and guaranteed operation at VCC ≥1.0V - all critical for robust front-panel reset implementation in consumer and industrial systems.
Technical Context
The MAX6445UK23L implements a dual-input manual reset function requiring simultaneous assertion of MR1 and MR2 for ≥6.72s to trigger a one-shot 140ms (min) RESET pulse. Its internal 50kΩ pullup on both MR1 and MR2 eliminates external resistors, and it features no RSTIN pin - confirming single-supply monitoring only.
This device belongs to the MAX6445/MAX6446 variant group with two extended-setup manual reset inputs and fixed-threshold VCC monitoring. It uses BiCMOS process, operates over –40°C to +85°C, and delivers 6µA typical supply current - enabling ultra-low-power system supervision without compromising reset timing accuracy or transient immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.313V ±1.5% - precisely sets brownout detection point for 2.5V or 3.3V rails with hysteresis to prevent chatter. |
| Manual Reset Setup Period (tMR) | 6.72s (L suffix) - prevents nuisance resets from brief button presses; requires simultaneous MR1+MR2 low for full duration. |
| Reset Timeout Period (tRP) | 140ms min / 210ms typ - ensures µP reset pulse meets minimum assertion time for reliable processor initialization. |
| Supply Current (ICC) | 6µA typ at 3.6V - enables multi-year battery life in always-on supervisory applications. |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET output even during deep brownout conditions down to 1.0V VCC. |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor and supports direct interface to CMOS µP reset inputs. |
| Temperature Range | –40°C to +85°C - fully specified for industrial and automotive cabin-temperature environments. |
Pinout & Package
MAX6445UK23L is housed in a 5-pin SOT23 package (package code U5-1, outline 21-0057), with pin 1 marked by a dot or bevel. The package measures 2.9mm × 1.6mm × 1.1mm and is RoHS-compliant (lead-free version denoted by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output driver; must be low-impedance connection to system ground plane. |
| 2 | VCC | Main power supply input and monitored voltage source; powers internal circuitry and defines reset threshold reference. |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup to VCC; must be held low ≥6.72s with MR2 to assert RESET. |
| 4 | MR2 | Active-low manual reset input with internal 50kΩ pullup to VCC; dual-input requirement prevents accidental reset activation. |
| 5 | RESET | Active-low push-pull output; drives low for ≥140ms upon valid VCC drop or MR1+MR2 assertion; no external pullup needed. |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset inputs | MR1 and MR2 both require ≥6.72s low assertion - enforces deliberate user action and eliminates false triggers from switch bounce or ESD. |
| Guaranteed reset validity down to VCC = 1.0V | Ensures deterministic µP reset state even during severe brownout; avoids undefined behavior in low-VCC edge cases. |
| 6µA typical supply current | Reduces standby power in battery-backed systems; enables integration into energy-sensitive designs without compromising supervision integrity. |
| Immunity to short voltage transients | Rejects ≤20µs VCC glitches down to 100mV below threshold - prevents spurious resets from noise or coupling in noisy industrial environments. |
| Push-pull RESET output | Eliminates external pullup resistor, reduces BOM count, and ensures fast, rail-to-rail logic transitions compatible with all modern µP reset inputs. |
Applications
| Set-Top Box Power Management | Industrial HMI Panel Reset |
|---|---|
Use Scenario: Front-panel reset button must distinguish between momentary press (menu navigation) and long press (full system reboot) without false triggers from mechanical bounce or EMI. IC Role / Device Role / Timing Role: MAX6445UK23L acts as dual-input reset arbiter - MR1 and MR2 tied to same physical button; 6.72s setup enforces intentional hold before asserting RESET. Use Value: Prevents accidental reboots during normal operation while enabling field-service recovery via deliberate long-press sequence. |
Use Scenario: Human-machine interface panel in factory automation requires fail-safe reset under brownout, ESD, and voltage ripple conditions. IC Role / Device Role / Timing Role: MAX6445UK23L monitors 3.3V VCC rail and provides 140ms min RESET pulse to PLC controller; 2.313V threshold aligns with 3.3V system margin. Use Value: Guarantees µP reset assertion even if VCC sags to 1.0V, and 6µA quiescent current minimizes impact on backup battery runtime. |
| DVD Player System Recovery | Medical Device Power Sequencing |
Use Scenario: Consumer DVD player needs reliable recovery from corrupted firmware states triggered by user-initiated hard reset. IC Role / Device Role / Timing Role: MAX6445UK23L serves as primary reset supervisor - MR1 and MR2 connected to recessed service button; 6.72s hold time prevents inadvertent activation. Use Value: Enables certified service-mode entry without modifying PCB layout; push-pull RESET ensures clean reset edge for flash memory controller initialization. |
Use Scenario: Portable medical monitor must maintain deterministic reset behavior during battery voltage decay and EMI-rich clinical environments. IC Role / Device Role / Timing Role: MAX6445UK23L supervises main 2.5V supply rail; 2.313V threshold provides 187mV headroom for safe brownout detection. Use Value: 6µA ICC extends battery life between calibrations; guaranteed operation down to VCC = 1.0V ensures reset integrity through full discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6446UK23L | Identical pinout, threshold, and timing - but open-drain RESET output instead of push-pull. | Requires external pullup resistor; suitable where level-shifting or wired-OR reset bus is needed. | Select MAX6446UK23L only if system design mandates open-drain topology for shared reset lines or mixed-voltage interfacing. |
| TPS3808G33DBVR | Single manual reset input, 3.3V fixed threshold, 200ms timeout, 1.6µA ICC - no dual-MR support or 6.72s setup option. | Lacks dual-input security; optimized for lower-power, single-button applications without extended setup requirements. | Choose TPS3808G33DBVR only for cost-sensitive, single-reset-button designs where nuisance rejection relies on shorter 200ms debounce instead of long setup. |
Compared with MAX6446UK23L, MAX6445UK23L offers integrated push-pull drive eliminating BOM overhead; versus TPS3808G33DBVR, it delivers superior front-panel security via dual-MR + 6.72s setup - critical for tamper-resistant or service-mode applications.
Availability
MAX6445UK23L is available at Aetrix Electronics and suitable for set-top boxes, industrial HMIs, DVD players, and portable medical devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6445UK23L 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6443–MAX6452 family was designed specifically for robust microprocessor supervision in noise-prone environments - emphasizing extended manual reset setup, low ICC, and guaranteed operation down to 1.0V VCC.
FAQ
What is the exact reset threshold voltage of MAX6445UK23L?
The MAX6445UK23L has a factory-set VCC reset threshold of 2.313V, with ±1.5% tolerance over temperature. This value is defined by the "23" suffix per Table 1 and is laser-trimmed during production. The threshold exhibits 60ppm/°C tempco and includes built-in hysteresis to prevent oscillation near trip point - ensuring stable reset assertion/deassertion in real-world supply conditions.
Does MAX6445UK23L support adjustable voltage monitoring via RSTIN?
No, MAX6445UK23L does not support RSTIN functionality. It is a single-supply fixed-threshold supervisor (MAX6445 variant) with VCC-only monitoring. RSTIN capability is exclusive to MAX6449–MAX6452 variants (6-pin SOT23). The MAX6445UK23L pinout contains GND, VCC, MR1, MR2, and RESET only - no RSTIN terminal is present or functional.
What is the purpose of the dual manual reset inputs MR1 and MR2 on MAX6445UK23L?
MR1 and MR2 on MAX6445UK23L implement a deliberate dual-activation security mechanism: both inputs must be held low simultaneously for ≥6.72s (L suffix) to trigger RESET. This prevents accidental resets from single-point failures, ESD events, or brief switch closures. Internal 50kΩ pullups eliminate external components, and the architecture is validated for use in service-mode entry and tamper-resistant systems.
Can MAX6445UK23L operate with VCC below 1.0V?
MAX6445UK23L is guaranteed to provide valid RESET output only down to VCC = 1.0V. Below this voltage, RESET current-sinking capability degrades rapidly and logic state becomes indeterminate. For applications requiring reset assertion down to 0V, a pulldown resistor (e.g., 100kΩ) must be added to the RESET line - but this is only valid for push-pull versions like MAX6445UK23L, not open-drain alternatives.
What package type and dimensions does MAX6445UK23L use?
MAX6445UK23L uses a 5-pin SOT23 package (package code U5-1, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm. Pin 1 is marked by a dot or bevel. The device is available in both leaded and lead-free versions - specify "+T" instead of "-T" for RoHS-compliant packaging. Land pattern 90-0174 applies for PCB layout.
MAX6445UK23L 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6445UK23L FAQ
1.How can I place an order for MAX6445UK23L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK23L 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 MAX6445UK23L reliable?
The price and inventory of MAX6445UK23L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK23L is usually 5 days.
3.What payment methods are accepted for MAX6445UK23L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK23L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK23L?
MAX6445UK23L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK23L 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 MAX6445UK23L?
For technical support, including MAX6445UK23L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK23L requirements.
6.How does Aetrix verify that MAX6445UK23L is sourced from the original manufacturer or authorized distributors?
All MAX6445UK23L 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 MAX6445UK23L meets industry standards.
7.What is the process for return or replacement of MAX6445UK23L?
All MAX6445UK23L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK23L, 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 MAX6445UK23L part is unused and in its original packaging.
Return procedure for MAX6445UK23L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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