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Analog Devices Inc./Maxim Integrated MAX6443US16L+T
- Part No.:
- MAX6443US16L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6443US16L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
The MAX6443US16L+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, 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 for 210ms (typ) after recovery, and consumes only 6µA at 3.6V - ideal for low-power consumer electronics power sequencing and brownout protection.
For engineers reviewing the MAX6443US16L+T datasheet, MAX6443US16L+T pinout, MAX6443US16L+T application, or MAX6443US16L+T equivalent, key selection criteria include its guaranteed valid reset down to VCC = 1.0V, immunity to <100ns glitches on MR1, 4-pin SOT143 package footprint, and precise factory-set 1.575V threshold with ±1.5% tolerance over -40°C to +85°C.
Technical Context
This device implements a precision bandgap-based voltage monitor for VCC with 60ppm/°C tempco and 2×VTH hysteresis, coupled with a digital timing block that enforces a fixed 6.72s low assertion on MR1 before generating a 140ms–280ms one-shot RESET pulse. The internal 50kΩ MR1 pullup enables direct connection to front-panel switches without external components.
The push-pull RESET output drives low to ≤0.3V at 50µA sink current and high to ≥0.8×VCC at 200µA source current, ensuring reliable interface with 1.8V–5.5V µP reset inputs. All timing and threshold specifications are fully guaranteed across the extended industrial temperature range (-40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±1.5% - precisely set at factory for 3.3V or 5V system VCC monitoring with brownout detection margin |
| Manual Reset Setup Period | 6.72s (L suffix) - prevents nuisance resets from brief switch closures; requires sustained MR1 low for full duration |
| Reset Timeout Period | 140ms min / 210ms typ - ensures µP completes full reset initialization before release |
| Supply Current | 6µA at 3.6V - enables multi-year battery operation in always-on monitoring applications |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout down to 1.0V VCC |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor; compatible with standard µP reset inputs |
| Package | 4-pin SOT143 - 1.3mm × 2.9mm footprint supports high-density PCB layouts |
Pinout & Package
MAX6443US16L+T is housed in a 4-pin SOT143 package (U4+1 outline, 21-0052), with gull-wing leads, RoHS-compliant lead-free finish (+T suffix), and thermal pad omitted.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be connected to system ground plane |
| 2 | VCC | Main supply input and monitored voltage rail; powers internal circuitry and sets reset threshold reference |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup to VCC; requires 6.72s low assertion to trigger one-shot RESET |
| 4 | RESET | Active-low push-pull output; drives low during VCC brownout or valid MR1 assertion, high otherwise |
Key Features
| Feature | Design Value |
|---|---|
| Extended manual reset setup | 6.72s MR1 hold time prevents false resets from tactile switch bounce or accidental presses |
| Precision fixed reset threshold | 1.575V ±1.5% with 60ppm/°C tempco ensures stable brownout detection across temperature |
| Ultra-low quiescent current | 6µA at 3.6V enables integration into energy-harvesting or coin-cell-powered systems |
| Valid reset at low VCC | Guaranteed RESET assertion and logic state integrity down to VCC = 1.0V |
| Glitch-immune MR1 input | Rejects transients <100ns, eliminating noise-induced spurious resets |
Applications
| Set-Top Box Power Sequencing | DVD Player Brownout Protection |
|---|---|
Use Scenario: Monitors main 3.3V rail during cold start and AC dropout events in cable set-top boxes. IC Role / Device Role / Timing Role: Single-supply supervisor asserting active-low RESET to ARM-based SoC upon VCC drop below 1.575V. Use Value: Prevents corrupted firmware execution by holding SoC in reset until 3.3V stabilizes for ≥210ms post-recovery. | Use Scenario: Detects rapid VCC sag during motor startup in portable DVD players powered by Li-ion batteries. IC Role / Device Role / Timing Role: Fixed-threshold supervisor triggering one-shot RESET pulse when battery voltage dips below 1.575V. Use Value: Ensures optical drive controller reinitializes cleanly without data corruption or mechanical fault lockup. |
| MP3 Player Front-Panel Reset | Industrial Modem Watchdog Interface |
Use Scenario: Implements long-press hardware reset using same button for UI navigation and system recovery. IC Role / Device Role / Timing Role: MR1 accepts 6.72s sustained press to assert RESET; shorter presses ignored per extended setup logic. Use Value: Eliminates need for dedicated reset button while preventing accidental resets during normal UI interaction. | Use Scenario: Provides fail-safe reset to embedded modem processor when host MCU fails to refresh watchdog. IC Role / Device Role / Timing Role: Push-pull RESET output directly drives modem's active-low reset pin with no external components. Use Value: Guarantees modem reboot within 210ms of VCC instability, restoring network connectivity without host intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316LUK31D3+T | 3.075V threshold, 3.36s MR1 setup (S suffix), 5-pin SOT23 package | Higher threshold suited for 3.3V-only systems; different pinout and package require PCB redesign | Select when 3.075V detection level matches system VCC nominal and SOT23 layout is available |
| TPS3808G15DBVR | 1.5V threshold, 200ms timeout, open-drain output, 5-pin SOT23 | Lacks extended manual reset; requires external pullup; lower quiescent current (1.8µA) | Choose for ultra-low-power designs where manual reset is not required and open-drain flexibility is needed |
Compared with MAX6443US16L+T, MAX6316LUK31D3+T offers higher threshold and faster manual reset but demands layout change, while TPS3808G15DBVR reduces current draw but removes extended-setup MR1 functionality - making MAX6443US16L+T optimal for cost-sensitive, space-constrained 1.5V–1.6V brownout detection with robust front-panel reset.
Availability
MAX6443US16L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, MP3 players, cable/DSL modems, and industrial equipment requiring stable component supply, long-term lifecycle support, and guaranteed performance over -40°C to +85°C.
Supply support for MAX6443US16L+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, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6443–MAX6452 family delivers highly reliable, low-current µP reset supervision with extended manual reset setup periods - engineered specifically for consumer electronics and industrial systems where nuisance resets from mechanical switches must be eliminated.
FAQ
What is the exact reset threshold voltage of the MAX6443US16L+T?
The MAX6443US16L+T has a factory-trimmed VCC reset threshold of 1.575V with ±1.5% tolerance over temperature. This value is fixed by the "16" suffix per Table 1 in the datasheet and is guaranteed across the full -40°C to +85°C operating range with 60ppm/°C tempco and 2×VTH hysteresis.
How does the manual reset function work on the MAX6443US16L+T?
The MAX6443US16L+T features a single extended-setup manual reset input (MR1) requiring a minimum 6.72s low assertion (L suffix) to trigger a one-shot RESET pulse. Its internal 50kΩ pullup allows direct switch connection, and it rejects glitches <100ns - ensuring only intentional long-press events cause reset, not switch bounce or EMI.
Does the MAX6443US16L+T support operation below 1.8V VCC?
Yes, the MAX6443US16L+T operates and guarantees valid RESET assertion down to VCC = 1.0V. Its internal circuitry remains functional at this level, and the push-pull RESET output maintains specified VOL ≤0.3V and VOH ≥0.8×VCC - enabling use in ultra-low-voltage battery-powered systems where other supervisors fail.
What package type and dimensions does the MAX6443US16L+T use?
The MAX6443US16L+T uses a 4-pin SOT143 package (outline 21-0052, land pattern 90-0183), measuring 1.3mm × 2.9mm with 0.95mm height and 0.95mm lead pitch. It is RoHS-compliant with lead-free terminations (+T suffix) and designed for reflow soldering at up to +260°C.
Can the MAX6443US16L+T monitor voltages other than VCC?
No, the MAX6443US16L+T monitors VCC only. It lacks an RSTIN pin and adjustable threshold capability - those features are exclusive to MAX6449–MAX6452 variants. For dual-rail or custom-threshold monitoring, select MAX6449UTxx+T or equivalent with RSTIN input and external resistor divider.
MAX6443US16L+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:
- 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+T FAQ
1.How can I place an order for MAX6443US16L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6443US16L+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 MAX6443US16L+T reliable?
The price and inventory of MAX6443US16L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6443US16L+T is usually 5 days.
3.What payment methods are accepted for MAX6443US16L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6443US16L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6443US16L+T?
MAX6443US16L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6443US16L+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 MAX6443US16L+T?
For technical support, including MAX6443US16L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6443US16L+T requirements.
6.How does Aetrix verify that MAX6443US16L+T is sourced from the original manufacturer or authorized distributors?
All MAX6443US16L+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 MAX6443US16L+T meets industry standards.
7.What is the process for return or replacement of MAX6443US16L+T?
All MAX6443US16L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6443US16L+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 MAX6443US16L+T part is unused and in its original packaging.
Return procedure for MAX6443US16L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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