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Analog Devices Inc./Maxim Integrated MAX6443US16L+
- Part No.:
- MAX6443US16L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6443US16L+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,129
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Product details
Overview
MAX6443US16L+ 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, 1.575V VCC reset threshold, and 6.72s manual reset setup period. It monitors VCC only, asserts RESET when VCC drops below 1.575V, holds RESET low for 210ms (typ) after recovery, and draws only 6µA at 3.6V - used in set-top boxes and consumer electronics for reliable power-on reset and nuisance-reset immunity.
For engineers reviewing the MAX6443US16L+ datasheet, MAX6443US16L+ pinout, MAX6443US16L+ application, or MAX6443US16L+ equivalent, key selection criteria include its 1.575V factory-set threshold, 6.72s MR1 hold time, SOT143-4 package, guaranteed operation down to VCC = 1.0V, and immunity to <20µs transients falling 100mV below threshold.
Technical Context
The MAX6443US16L+ implements a precision bandgap-based voltage monitor for VCC with ±0.5% threshold accuracy and 60ppm/°C tempco. Its internal timing circuit enforces a fixed 6.72s low assertion on MR1 before generating a 140ms–280ms one-shot RESET pulse, rejecting switch bounce and short closures.
RESET logic is push-pull with VOL ≤ 0.3V at ISINK = 50µA and VOH ≥ 0.8×VCC at ISOURCE = 200µA, ensuring robust drive into µP reset inputs. The device operates across –40°C to +85°C and remains functional down to VCC = 1.0V, guaranteeing valid reset assertion during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±1.5% - precisely holds system in reset until VCC stabilizes above this level during power-up. |
| Manual Reset Setup Time | 6.72s (tMR, L-suffix) - prevents accidental resets from brief front-panel button presses. |
| Reset Timeout Period | 140ms min / 210ms typ - ensures µP receives sufficiently long reset pulse for full initialization. |
| Supply Current | 6µA at 3.6V - enables use in battery-backed or ultra-low-power systems without significant drain. |
| Operating Voltage Range | 1.0V to 5.5V - supports valid RESET assertion even during deep brownout (down to 1.0V VCC). |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor; drives µP reset directly. |
| 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, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane. |
| 2 VCC | Supply and monitored voltage input | Primary power source and voltage under supervision; valid from 1.0V to 5.5V. |
| 3 MR1 | Extended-setup manual reset input | Active-low input with internal 50kΩ pullup; requires ≥6.72s low assertion to trigger RESET pulse. |
| 4 RESET | Active-low push-pull reset output | Drives µP reset pin directly; sinks 50µA @ 0.3V max; no external pullup needed. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.575V threshold | Eliminates external resistor divider; reduces BOM count and layout area vs adjustable supervisors. |
| 6.72s MR1 setup timeout | Rejects mechanical switch bounce and inadvertent presses - critical for front-panel reset buttons. |
| Guaranteed RESET down to VCC = 1.0V | Ensures deterministic reset behavior during slow power ramp-down, preventing code corruption. |
| 6µA supply current | Enables integration into always-on subsystems (e.g., remote control receivers) without measurable battery load. |
| Push-pull RESET output | Removes dependency on external pullup resistor and associated parasitic capacitance, improving noise immunity. |
Applications
| Set-Top Box Power Sequencing | DVD Player Brownout Recovery |
|---|---|
Use Scenario: Power supply ramps slowly during cold start; VCC dips transiently during HDD spin-up. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts RESET until stable; blocks µP execution until all rails settle. Use Value: Prevents boot failure and filesystem corruption by enforcing minimum 210ms reset hold after VCC exceeds 1.575V. | Use Scenario: AC line sag causes 3.3V rail to dip below 1.6V for ~50ms during disc read. IC Role / Device Role / Timing Role: Detects VCC drop below 1.575V and asserts RESET for 210ms after recovery. Use Value: Forces controlled reboot instead of erratic playback or UI lockup - improves perceived reliability. |
| Cable Modem Front-Panel Reset | MP3 Player Manual Recovery |
Use Scenario: User presses "reset" button for <1s during normal operation - must not trigger reset. IC Role / Device Role / Timing Role: MR1 input ignores pulses <6.72s; only asserts RESET after sustained press. Use Value: Eliminates nuisance resets from accidental button taps - enhances user experience. | Use Scenario: Battery voltage decays to 1.2V during deep discharge; µP must remain held in reset. IC Role / Device Role / Timing Role: Maintains valid active-low RESET output even as VCC falls from 1.575V to 1.0V. Use Value: Guarantees safe shutdown state without external level-shifting or auxiliary monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316LUK31D3+ | 3.075V threshold, 3.36s MR1 setup (SOT23-5), open-drain output | Requires external pullup; higher threshold suits 3.3V systems needing tighter margin | Select when 3.075V trip point and SOT23-5 footprint are preferred over SOT143-4 |
| TPS3808G15DBVR | 1.5V threshold, 200ms timeout, 2.5µA ICC, SOT23-6, push-pull | No manual reset input; relies solely on VCC monitoring | Select when manual reset functionality is unnecessary and ultra-low ICC (<3µA) is critical |
Compared with MAX6443US16L+, MAX6316LUK31D3+ offers higher threshold and different package but lacks push-pull drive; TPS3808G15DBVR provides lower ICC and tighter threshold tolerance but omits manual reset - choice depends on whether front-panel reset, output drive type, and supply voltage margin are design priorities.
Availability
MAX6443US16L+ 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 automotive-grade reliability assurance.
Supply support for MAX6443US16L+ 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 power, sensing, and interface applications, with focus on high-reliability, low-power solutions.
The MAX6443–MAX6452 family delivers long-setup manual reset supervision for consumer and industrial equipment where front-panel usability and brownout resilience are critical - targeting applications with mechanical switches and unregulated supplies.
FAQ
What is the exact reset threshold voltage of the MAX6443US16L+?
The MAX6443US16L+ has a factory-trimmed VCC reset threshold of 1.575V, with guaranteed limits of 1.52V (min) and 1.62V (max) over temperature and process variation. This value is fixed and non-adjustable, corresponding to the "16" suffix in the part number per Table 1 of the datasheet.
How long must the MR1 pin be held low to trigger a reset on the MAX6443US16L+?
The MR1 pin on the MAX6443US16L+ must be held low for a minimum of 6.72 seconds - defined by the "L" suffix per Table 2 - before the RESET output pulses low for 140ms (min). Shorter assertions are ignored, providing immunity to switch bounce and accidental presses.
Does the MAX6443US16L+ support operation below 1.8V VCC?
Yes, the MAX6443US16L+ is fully specified down to VCC = 1.0V. Its RESET output remains valid (active-low push-pull) and guaranteed functional at 1.0V, enabling reliable reset assertion during deep brownout conditions where many supervisors fail.
Is an external pullup resistor required for the RESET output of the MAX6443US16L+?
No, the MAX6443US16L+ features a push-pull RESET output, so no external pullup resistor is needed. The output actively drives high (VOH ≥ 0.8×VCC) and low (VOL ≤ 0.3V), unlike open-drain variants such as MAX6444US16L+ which require a pullup.
What package type and pin count does the MAX6443US16L+ use?
The MAX6443US16L+ uses a 4-pin SOT143 package (outline 21-0052), with pins arranged as GND (1), VCC (2), MR1 (3), and RESET (4) in top-view orientation. Its compact 1.3mm × 2.1mm footprint supports high-density consumer PCB layouts.
MAX6443US16L+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- 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
MAX6443US16L+ FAQ
1.How can I place an order for MAX6443US16L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6443US16L+ 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 MAX6443US16L+ reliable?
The price and inventory of MAX6443US16L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6443US16L+ is usually 5 days.
3.What payment methods are accepted for MAX6443US16L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6443US16L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6443US16L+?
MAX6443US16L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6443US16L+ 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 MAX6443US16L+?
For technical support, including MAX6443US16L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6443US16L+ requirements.
6.How does Aetrix verify that MAX6443US16L+ is sourced from the original manufacturer or authorized distributors?
All MAX6443US16L+ 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 MAX6443US16L+ meets industry standards.
7.What is the process for return or replacement of MAX6443US16L+?
All MAX6443US16L+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6443US16L+, 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 MAX6443US16L+ part is unused and in its original packaging.
Return procedure for MAX6443US16L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6443US16L+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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