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Analog Devices Inc./Maxim Integrated MAX6443US26L+T
- Part No.:
- MAX6443US26L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6443US26L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,664
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Product details
Overview
MAX6443US26L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with one extended-setup manual reset input (MR1), active-low push-pull RESET output, and 2.625V VCC reset threshold. It monitors VCC only, asserts RESET when VCC drops below 2.625V (±1.5% over temperature), maintains reset for 210ms (typ) after recovery, and requires MR1 to be held low for 6.72s (L suffix) to trigger a manual reset pulse-used in set-top boxes and DVD players for reliable power-on initialization and front-panel reset immunity.
For engineers reviewing the MAX6443US26L+T datasheet, MAX6443US26L+T pinout, MAX6443US26L+T application, or MAX6443US26L+T equivalent, key selection criteria include its 2.625V fixed reset threshold, 6.72s manual reset setup time, 210ms reset timeout, -40°C to +85°C operation, and SOT143-4 package compatibility with space-constrained consumer electronics designs.
Technical Context
The MAX6443US26L+T implements a precision bandgap-based voltage monitor for VCC only, with factory-trimmed 2.625V threshold (±1.5% over -40°C to +85°C) and 60ppm/°C tempco. Its internal timing circuit enforces a fixed 6.72s minimum low-time on MR1 before asserting RESET, rejecting switch bounce and transient closures.
RESET is push-pull active-low with guaranteed logic state down to VCC = 1.0V, sinking up to 3.2mA at VCC ≥ 4.25V, and features 20µs VCC-to-RESET delay (1mV/µs edge). The device draws only 6µA typical supply current at 3.6V and operates across 1.0V–5.5V VCC range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±1.5% - precisely holds system reset until main supply stabilizes above this level |
| Manual Reset Setup Time (tMR) | 6.72s (L suffix) - prevents nuisance resets from brief front-panel button presses |
| Reset Timeout Period (tRP) | 210ms (typ), 140ms (min) - ensures µP completes full reset sequence before release | VCC Operating Range | 1.0V to 5.5V - supports wide-input systems including battery-backed and low-voltage logic |
| Supply Current (ICC) | 6µA (typ at 3.6V) - enables always-on monitoring in power-sensitive consumer devices |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor in most µP interfaces |
| Temperature Range | -40°C to +85°C - qualified for industrial and consumer equipment operating environments |
| Package | SOT143-4 - 1.3mm × 2.1mm footprint ideal for compact PCB layouts |
Pinout & Package
MAX6443US26L+T is housed in a 4-pin SOT143 package (1.3mm × 2.1mm, 0.95mm height), lead(Pb)-free, RoHS-compliant, with gull-wing leads and thermal pad not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage; must be low-impedance connection |
| 2 | VCC | Main power supply input and monitored voltage source; powers internal circuitry and sets RESET logic levels |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup to VCC; requires ≥6.72s low assertion to trigger one-shot RESET pulse |
| 4 | RESET | Active-low push-pull output; drives µP reset pin directly without external components; sinks up to 3.2mA |
Key Features
| Feature | Design Value |
|---|---|
| Extended manual reset setup period | 6.72s (L suffix) - eliminates false resets from accidental or short-duration button presses in consumer UIs |
| Precision fixed reset threshold | 2.625V ±1.5% - ensures deterministic reset behavior across voltage and temperature without external resistors |
| Low quiescent current | 6µA typical at 3.6V - extends battery life in always-on monitoring applications |
| Valid RESET down to VCC = 1.0V | Guaranteed logic state even during brownout - prevents µP from executing corrupted code during partial power loss |
| Push-pull RESET output | No external pullup required - simplifies BOM and layout while ensuring fast, robust reset signal drive |
Applications
| Set-Top Box Power Sequencing | DVD Player Front-Panel Reset |
|---|---|
Use Scenario: Ensures stable boot of media processor after AC power-up or standby wake-up, preventing firmware lockup due to marginal VCC ramp. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts RESET until voltage exceeds 2.625V for ≥210ms; MR1 tied to front-panel reset button with 6.72s hold requirement. Use Value: Eliminates spurious reboots caused by noisy power rails or momentary button contact during normal operation. | Use Scenario: Provides user-initiated hard reset via front-panel "reset" button without interfering with channel navigation or playback controls. IC Role / Device Role / Timing Role: MR1 accepts long-press (≥6.72s) to generate 210ms RESET pulse; VCC monitoring guards against brownout-induced crashes during disc spin-up. Use Value: Enables safe, intentional system restart without requiring service mode or power cycling. |
| Cable Modem System Recovery | Industrial Control Panel Supervision |
Use Scenario: Restores network connectivity after upstream power interruption by forcing clean reboot of embedded Linux host upon VCC recovery. IC Role / Device Role / Timing Role: VCC supervisor with 2.625V threshold and 210ms timeout ensures µP remains held in reset until power stabilizes post-interruption. Use Value: Prevents failed boot sequences that would otherwise require technician field visit or remote firmware update. | Use Scenario: Guarantees deterministic startup of PLC I/O controller after mains power restoration in factory automation cabinets. IC Role / Device Role / Timing Role: Monitors 5V system rail; RESET output drives controller's nRST pin; MR1 wired to maintenance access button with 6.72s debounce. Use Value: Meets IEC 61000-4-4 immunity requirements by rejecting EFT-induced glitches shorter than tMR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316US26D3+T | Same 2.625V threshold, but 140ms min timeout (vs. 210ms typ), no extended manual reset - uses standard 100ms setup | Lacks long manual reset immunity; suitable only where front-panel reset is not used or handled externally | Select when simpler reset timing suffices and board space allows larger SOT23-5 package |
| TPS3808G26DBVR | 2.63V threshold, 200ms timeout, 1.6µA ICC, but only 200ms max manual reset setup (not configurable to 6.72s) | Cannot replace long-press functionality; designed for standard pushbutton use, not nuisance-immune UIs | Choose for ultra-low-power battery applications where extended manual reset is unnecessary |
Compared with MAX6443US26L+T, MAX6316US26D3+T offers faster reset release but no long-setup protection, while TPS3808G26DBVR delivers lower current draw but lacks configurable multi-second manual reset-making MAX6443US26L+T uniquely suited for consumer front-panel reliability.
Availability
MAX6443US26L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable modems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6443US26L+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX6443–MAX6452 family was engineered specifically for reliable microprocessor supervision in cost-sensitive, space-constrained consumer electronics where immunity to switch bounce and power transients is critical.
FAQ
What is the exact reset threshold voltage of the MAX6443US26L+T?
The MAX6443US26L+T has a factory-set VCC reset threshold of 2.625V, with ±1.5% tolerance over the full -40°C to +85°C temperature range and 60ppm/°C tempco. This value is confirmed in Table 1 of the datasheet under suffix "26", and applies exclusively to the VCC monitor-not RSTIN, which is unused in this variant.
How does the manual reset function work on the MAX6443US26L+T?
The MAX6443US26L+T features a single extended-setup manual reset input (MR1) requiring ≥6.72 seconds (L suffix) of continuous low assertion to trigger a one-shot 210ms (typ) RESET pulse. Internal 50kΩ pullup ensures MR1 defaults high; no external components are needed, and short pulses <6.72s are ignored to prevent nuisance resets.
Is the RESET output of the MAX6443US26L+T push-pull or open-drain?
The MAX6443US26L+T uses an active-low push-pull RESET output, as indicated by the "US" prefix and confirmed in the Pin Configurations table. This eliminates the need for an external pullup resistor and provides strong sink capability (up to 3.2mA at VCC ≥ 4.25V), unlike open-drain variants such as MAX6444.
What package type and dimensions does the MAX6443US26L+T use?
The MAX6443US26L+T is packaged in a 4-pin SOT143 (U4+1) case measuring 1.3mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead(Pb)-free finish. Land pattern #90-0183 applies, and the device is supplied in tape-and-reel format with 2500-piece minimum order quantity.
Does the MAX6443US26L+T support monitoring of auxiliary voltages like RSTIN?
No, the MAX6443US26L+T does not support RSTIN monitoring. It is a single-supply supervisor (VCC only) within the MAX6443–MAX6448 subgroup. RSTIN functionality is exclusive to MAX6449–MAX6452 variants, which feature six-pin SOT23 packages and adjustable threshold capability.
MAX6443US26L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- 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-143-4
MAX6443US26L+T FAQ
1.How can I place an order for MAX6443US26L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6443US26L+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 MAX6443US26L+T reliable?
The price and inventory of MAX6443US26L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6443US26L+T is usually 5 days.
3.What payment methods are accepted for MAX6443US26L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6443US26L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6443US26L+T?
MAX6443US26L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6443US26L+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 MAX6443US26L+T?
For technical support, including MAX6443US26L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6443US26L+T requirements.
6.How does Aetrix verify that MAX6443US26L+T is sourced from the original manufacturer or authorized distributors?
All MAX6443US26L+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 MAX6443US26L+T meets industry standards.
7.What is the process for return or replacement of MAX6443US26L+T?
All MAX6443US26L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6443US26L+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 MAX6443US26L+T part is unused and in its original packaging.
Return procedure for MAX6443US26L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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