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Analog Devices Inc./Maxim Integrated MAX6444US26L+T
- Part No.:
- MAX6444US26L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6444US26L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,411
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Product details
Overview
MAX6444US26L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with one extended-setup manual reset input (MR1), active-low open-drain RESET output, 2.625V VCC reset threshold, and 6.72s manual reset setup period. It monitors VCC only, asserts RESET when VCC drops below 2.625V (±1.5% over temperature), holds RESET low for 210ms (typ) after recovery, and consumes just 6µA at 3.6V - used in set-top boxes and cable modems to prevent spurious resets from switch bounce.
For engineers reviewing the MAX6444US26L+T datasheet, MAX6444US26L+T pinout, MAX6444US26L+T application, or MAX6444US26L+T equivalent, key selection criteria include its 2.625V precision reset threshold, 6.72s MR1 setup timeout (preventing nuisance resets), SOT143-4 package compatibility, and guaranteed operation down to VCC = 1.0V with valid open-drain RESET assertion.
Technical Context
The MAX6444US26L+T implements a precision bandgap-based voltage monitor for VCC only, with factory-trimmed 2.625V reset threshold (±1.5% over -40°C to +85°C) and 60ppm/°C tempco. Its internal 50kΩ pullup on MR1 requires sustained low assertion for 6.72s before generating a 140ms–280ms one-shot RESET pulse.
RESET is open-drain with guaranteed VOL ≤ 0.3V at ISINK = 50µA (VCC ≥ 1.0V), and leakage < 1µA when deasserted. The device ignores transients < 20µs duration when VCC dips 100mV below threshold, ensuring immunity to short supply glitches without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±1.5% - precisely triggers reset during brownout at nominal 2.625V supply level |
| Manual Reset Setup Period (tMR) | 6.72s typ - prevents accidental system reset from brief front-panel button presses |
| Reset Timeout Period (tRP) | 140ms min / 210ms typ - ensures µP completes full power-up initialization before release |
| Supply Current (ICC) | 6µA typ at 3.6V - enables always-on monitoring in battery-backed or low-power systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even as VCC decays to 1.0V |
| Output Type | Active-low open-drain - allows level-shifting to µP logic rails up to 6V using external pullup |
| Package | SOT143-4 - 1.3mm × 2.1mm footprint ideal for space-constrained consumer PCBs |
Pinout & Package
SOT143-4 package: 1.3mm × 2.1mm body, 0.95mm pitch, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 2 VCC | Power supply input | Monitored supply rail and IC power source; operates from 1.0V to 5.5V with valid RESET down to 1.0V |
| 3 MR1 | Manual reset input | Active-low input with internal 50kΩ pullup to VCC; requires ≥6.72s low assertion to trigger one-shot RESET |
| 4 RESET | Reset output | Open-drain, active-low signal; requires external pullup resistor (min 20kΩ) to VCC or other logic rail |
Key Features
| Feature | Design Value |
|---|---|
| Extended manual reset setup period | 6.72s tMR eliminates false resets from mechanical switch bounce or momentary user presses |
| Precision 2.625V reset threshold | ±1.5% tolerance over -40°C to +85°C ensures reliable brownout detection across industrial temperature range |
| Ultra-low 6µA supply current | Enables permanent supervision in always-on consumer devices without measurable battery drain |
| Valid RESET down to VCC = 1.0V | Guarantees clean reset assertion during deep brownout, preventing µP lockup at marginal supply levels |
| Transient immunity | Rejects <20µs VCC glitches dipping 100mV below threshold - no external RC filter required |
Applications
| Set-Top Box Power Sequencing | Cable Modem Brownout Recovery |
|---|---|
Use Scenario: Monitors main 3.3V rail during cold start and grid fluctuations in digital TV receivers. IC Role / Device Role / Timing Role: Single-supply supervisor asserting active-low RESET to ARM-based SoC until 3.3V stabilizes above 2.625V for 210ms. Use Value: Prevents firmware corruption by holding SoC in reset during unstable power ramp-up and transient sags. | Use Scenario: Ensures reliable reboot after AC line interruption in DOCSIS-compliant broadband modems. IC Role / Device Role / Timing Role: Detects VCC drop below 2.625V and holds RESET low for 210ms post-recovery to guarantee PHY/MAC reinitialization. Use Value: Eliminates "stuck boot" failures by enforcing minimum reset pulse width independent of µP timing margins. |
| MP3 Player Front-Panel Reset | DVD Player Nuisance-Proof Service Mode |
Use Scenario: Uses same physical power button for both soft interrupt (short press) and hard reset (long press). IC Role / Device Role / Timing Role: MR1 input tied to pushbutton; 6.72s setup period distinguishes intentional reset from accidental presses. Use Value: Enables dual-function UI control without extra hardware - no separate reset button needed. | Use Scenario: Enters factory service mode only when technician holds two buttons simultaneously for >6.72s. IC Role / Device Role / Timing Role: MR1 connected to front-panel reset switch; long-duration assertion triggers one-shot RESET pulse. Use Value: Blocks inadvertent entry into diagnostic mode during normal playback or transport operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6444US26K+T | 10.08s manual reset setup period vs. 6.72s - longer debounce for higher-noise environments | Preferred where ESD-prone front panels or high-vibration mounting increases risk of false MR1 activation | Select when system-level noise or mechanical shock demands stricter manual reset validation |
| MAX6444US26S+T | 3.36s manual reset setup period vs. 6.72s - half the time for faster user-initiated reset | Better suited for portable devices requiring rapid recovery after accidental power loss | Choose when end-user experience prioritizes shorter reset initiation time over maximum nuisance immunity |
Compared with MAX6444US26K+T, the MAX6444US26L+T offers faster reset initiation (6.72s vs. 10.08s) while retaining identical 2.625V threshold and SOT143-4 footprint; versus MAX6444US26S+T, it provides stronger immunity to brief switch closures at the cost of slightly longer user wait time.
Availability
MAX6444US26L+T is available at Aetrix Electronics and suitable for set-top boxes, cable modems, and MP3 players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6444US26L+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 precision analog and mixed-signal ICs for industrial, communications, and consumer applications.
The MAX6443–MAX6452 family delivers ultra-low-power, high-immunity microprocessor supervisors optimized for consumer electronics and networking equipment where reliable power-up sequencing and robust manual reset are critical.
FAQ
What is the exact reset threshold voltage for MAX6444US26L+T?
The MAX6444US26L+T has a factory-set VCC reset threshold of 2.625V, with ±1.5% tolerance over the full -40°C to +85°C operating temperature range and 60ppm/°C tempco. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" for suffix "26", and applies exclusively to the VCC supply monitor - the device does not include RSTIN functionality.
Does MAX6444US26L+T support dual manual reset inputs?
No, MAX6444US26L+T supports only a single extended-setup manual reset input (MR1). It belongs to the MAX6443/MAX6444 subgroup, which lacks MR2 and RSTIN pins. Dual manual reset capability is exclusive to MAX6445–MAX6448 and MAX6449–MAX6452 variants, as confirmed in the Pin Description and Selector Guide sections of the datasheet.
What package type and pin count does MAX6444US26L+T use?
MAX6444US26L+T uses the SOT143-4 package: a 4-pin, surface-mount, gull-wing outline with 0.95mm lead pitch and 1.3mm × 2.1mm body size. Pin configuration is GND (1), VCC (2), MR1 (3), RESET (4), as shown in the "Pin Configurations" diagram on page 10 of the datasheet.
Can MAX6444US26L+T monitor an external voltage via RSTIN?
No, MAX6444US26L+T does not include an RSTIN pin or adjustable-threshold functionality. It is a single-fixed-threshold supervisor monitoring only VCC. RSTIN capability is reserved for MAX6449–MAX6452 variants (6-pin SOT23), as explicitly stated in the General Description and confirmed in the Pin Description table where RSTIN appears only for parts numbered MAX6449 and higher.
What is the minimum reset timeout period specified for MAX6444US26L+T?
The minimum reset timeout period for MAX6444US26L+T is 140ms, as specified in the Electrical Characteristics table under "Reset Timeout Period (tRP)". The typical value is 210ms, and maximum is 280ms. This timeout applies both after VCC recovery and after valid MR1 assertion, ensuring sufficient hold time for microprocessor initialization.
MAX6444US26L+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:
- Open Drain or Open Collector
- 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
MAX6444US26L+T FAQ
1.How can I place an order for MAX6444US26L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6444US26L+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 MAX6444US26L+T reliable?
The price and inventory of MAX6444US26L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6444US26L+T is usually 5 days.
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4.How is shipping managed for MAX6444US26L+T?
MAX6444US26L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6444US26L+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 MAX6444US26L+T?
For technical support, including MAX6444US26L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6444US26L+T requirements.
6.How does Aetrix verify that MAX6444US26L+T is sourced from the original manufacturer or authorized distributors?
All MAX6444US26L+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 MAX6444US26L+T meets industry standards.
7.What is the process for return or replacement of MAX6444US26L+T?
All MAX6444US26L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6444US26L+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 MAX6444US26L+T part is unused and in its original packaging.
Return procedure for MAX6444US26L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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