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Analog Devices Inc./Maxim Integrated MAX6445UK16L+
- Part No.:
- MAX6445UK16L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK16L+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,767
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Product details
Overview
MAX6445UK16L+ from Maxim Integrated is a dual-input, fixed-threshold microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC at 1.575V ±1.5% with 60ppm/°C tempco, featuring two extended-setup manual reset inputs (MR1/MR2), 6.72s minimum hold time, 140ms min reset timeout, and push-pull active-low RESET output. It prevents nuisance resets in consumer electronics power sequencing and front-panel control systems.
For engineers reviewing the MAX6445UK16L+ datasheet, MAX6445UK16L+ pinout, MAX6445UK16L+ application, or MAX6445UK16L+ equivalent, key selection criteria include dual extended manual reset timing (tMR = 6.72s), guaranteed reset assertion down to VCC = 1.0V, low 6µA supply current, and immunity to <100ns glitches on MR inputs - all validated over -40°C to +85°C.
Technical Context
The MAX6445UK16L+ implements dual independent manual reset inputs (MR1 and MR2), both requiring simultaneous low assertion for ≥6.72s (L-suffix) before generating a one-shot 140ms–280ms RESET pulse. Its VCC monitor uses a precision bandgap reference with factory-trimmed 1.575V threshold and 60ppm/°C temperature coefficient.
RESET output is push-pull active-low, sinking up to 3.2mA at VCC ≥ 4.25V while maintaining VOL ≤ 0.4V; it guarantees valid logic state across full VCC range (1.0V–5.5V). Internal 50kΩ pullups on MR1/MR2 eliminate external components for switch interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.575V ±1.5% - precisely sets brownout detection point for 1.6V–1.8V supply rails |
| Manual Reset Setup Period (tMR) | 6.72s typ - prevents false resets from brief front-panel button presses |
| Reset Timeout Period (tRP) | 140ms min / 210ms typ - ensures sufficient processor initialization time after power recovery |
| VCC Supply Current | 6µA typ at 3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Temperature Range | -40°C to +85°C - fully specified for industrial and consumer-grade embedded applications |
| RESET Output Type | Push-pull active-low - eliminates need for external pullup resistor in most µP interfaces |
| MR Input Glitch Rejection | 100ns - rejects EMI-induced noise on manual reset lines without external RC filtering |
Pinout & Package
MAX6445UK16L+ is housed in a 5-pin SOT23 package (U5+1 outline, 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad option not included. Pin 1 is GND, pin 2 is VCC, pin 3 is MR1, pin 4 is RESET, and pin 5 is MR2 - all verified per Maxim's official pin configuration diagram (SOT23-5 top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for internal comparators and output driver; must be low-impedance connection to system ground plane |
| VCC (Pin 2) | Supply voltage input | Power source and monitored rail; device operates and asserts reset when VCC drops below 1.575V |
| MR1 (Pin 3) | Extended manual reset input | Active-low input with internal 50kΩ pullup; requires ≥6.72s low assertion to trigger RESET pulse |
| RESET (Pin 4) | Active-low reset output | Push-pull driver asserting low for 140ms min upon VCC brownout or valid MR1/MR2 event |
| MR2 (Pin 5) | Extended manual reset input | Active-low input with internal 50kΩ pullup; both MR1 and MR2 must be held low simultaneously for tMR to initiate reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended manual reset inputs | MR1 and MR2 both require simultaneous 6.72s low assertion - prevents accidental resets during normal UI interaction |
| Precision 1.575V VCC threshold | Factory-trimmed ±1.5% tolerance with 60ppm/°C tempco - ensures stable brownout detection across temperature |
| Guaranteed reset down to VCC = 1.0V | Valid RESET logic state maintained even as supply decays to 1.0V - critical for graceful shutdown sequencing |
| 6µA typical supply current | Enables use in always-on subsystems without compromising battery life in portable devices |
| 100ns MR input glitch rejection | Eliminates need for external debounce circuitry - reduces BOM count and PCB area |
Applications
| Set-Top Box Power Management | DVD Player Front-Panel Control |
|---|---|
Use Scenario: System recovers from brownout caused by HDMI hot-plug transients or AC line sag. IC Role / Device Role / Timing Role: Monitors 1.6V core supply and asserts RESET for 210ms after VCC exceeds 1.575V, ensuring clean µP restart. Use Value: Prevents corrupted firmware execution during unstable power conditions using factory-calibrated threshold and tempco. |
Use Scenario: User holds "Power" and "Eject" buttons simultaneously for >6.72s to force hard reset. IC Role / Device Role / Timing Role: Dual MR1/MR2 inputs enforce intentional reset action; internal 50kΩ pullups simplify switch interface. Use Value: Eliminates nuisance resets from single-button presses while enabling service-mode recovery via coordinated button press. |
| Cable Modem Boot Integrity | MP3 Player Low-Power Sequencing |
Use Scenario: Power-up sequence fails due to slow-ramping 3.3V rail; µP executes invalid code before voltage stabilizes. IC Role / Device Role / Timing Role: VCC monitor holds RESET low until 3.3V exceeds 1.575V and remains asserted for 210ms post-threshold crossing. Use Value: Ensures µP remains held in reset until supply is fully regulated and stable - no external timing capacitor required. |
Use Scenario: Battery voltage decays to 1.4V during deep discharge; system must shut down cleanly before data loss. IC Role / Device Role / Timing Role: Asserts RESET at 1.575V threshold and maintains valid logic down to VCC = 1.0V, enabling controlled firmware save. Use Value: Guarantees deterministic reset behavior even under extreme low-VCC conditions where other supervisors fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6445UK16T+ | tMR = 1.68s (T-suffix) vs. 6.72s (L-suffix); identical VCC threshold, package, and RESET drive | Suitable for applications needing faster manual reset response, e.g., lab test fixtures with momentary switches | Select MAX6445UK16T+ only if 6.72s hold time is excessive for intended user interface; otherwise retain L-suffix for robustness |
| MAX6446UK16L+ | Open-drain RESET output instead of push-pull; same VCC threshold, tMR, and pinout | Required when level-shifting to higher-voltage logic (e.g., 5V µP reset input) or wired-OR reset bus configurations | Choose MAX6446UK16L+ only if open-drain functionality is explicitly needed; MAX6445UK16L+ simplifies design with integrated push-pull drive |
Compared with MAX6445UK16T+, the MAX6445UK16L+ provides four times longer manual reset setup period for enhanced noise immunity in consumer UIs; compared with MAX6446UK16L+, it eliminates external pullup requirements and supports direct µP reset pin connection without voltage translation.
Availability
MAX6445UK16L+ is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable modems, MP3 players, and industrial equipment requiring stable component supply across extended temperature ranges and long-term production continuity.
Supply support for MAX6445UK16L+ 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 management, sensing, and interface applications, with emphasis on high-reliability, low-power solutions.
The MAX6443–MAX6452 family delivers robust µP supervision for consumer and industrial systems where immunity to transient noise and intentional manual reset control are critical - specifically engineered for front-panel switch interfaces and brownout resilience.
FAQ
What is the exact VCC reset threshold voltage for MAX6445UK16L+?
The MAX6445UK16L+ has a factory-set VCC reset threshold of 1.575V with ±1.5% tolerance (1.52V to 1.62V) and 60ppm/°C temperature coefficient. This value is confirmed in Table 1 of the datasheet under suffix "16", and applies across the full -40°C to +85°C operating range. The MAX6445UK16L+ uses this precise threshold to detect brownout on 1.6V–1.8V supply rails without external calibration.
How does the dual manual reset function work on MAX6445UK16L+?
The MAX6445UK16L+ requires both MR1 and MR2 inputs to be held low simultaneously for ≥6.72s (L-suffix) before asserting RESET for 140ms minimum. This dual-input requirement prevents accidental resets from single-button presses. Both pins feature internal 50kΩ pullups to VCC, so simple SPST switches to ground suffice - no external resistors needed. The MAX6445UK16L+ ignores transitions shorter than 100ns to reject EMI.
Is MAX6445UK16L+ compatible with 1.0V VCC operation?
Yes, the MAX6445UK16L+ guarantees valid RESET output logic down to VCC = 1.0V, including proper VOL ≤ 0.3V when sinking 50µA. This capability is explicitly specified in the Electrical Characteristics table and enables safe shutdown sequencing in ultra-low-voltage systems. Below 1.0V, RESET behavior is not guaranteed - the MAX6445UK16L+ is not rated for sub-1.0V operation.
What package type and pin count does MAX6445UK16L+ use?
The MAX6445UK16L+ uses a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, pin 4 = RESET, and pin 5 = MR2. This compact 2.9mm × 1.6mm footprint is verified in the Pin Configurations section and supported by Maxim's official package drawings. The MAX6445UK16L+ does not use SOT143 or 6-pin variants.
Does MAX6445UK16L+ support adjustable reset thresholds?
No, the MAX6445UK16L+ is a fixed-threshold device monitoring only VCC at 1.575V. Adjustable threshold capability (via RSTIN pin) is exclusive to MAX6449–MAX6452 variants - the MAX6445UK16L+ lacks the RSTIN pin and associated comparator. Its datasheet confirms no RSTIN functionality, and the pinout shows only GND, VCC, MR1, RESET, and MR2 - five terminals total.
MAX6445UK16L+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
MAX6445UK16L+ FAQ
1.How can I place an order for MAX6445UK16L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK16L+ 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 MAX6445UK16L+ reliable?
The price and inventory of MAX6445UK16L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK16L+ is usually 5 days.
3.What payment methods are accepted for MAX6445UK16L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK16L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK16L+?
MAX6445UK16L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK16L+ 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 MAX6445UK16L+?
For technical support, including MAX6445UK16L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK16L+ requirements.
6.How does Aetrix verify that MAX6445UK16L+ is sourced from the original manufacturer or authorized distributors?
All MAX6445UK16L+ 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 MAX6445UK16L+ meets industry standards.
7.What is the process for return or replacement of MAX6445UK16L+?
All MAX6445UK16L+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK16L+, 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 MAX6445UK16L+ part is unused and in its original packaging.
Return procedure for MAX6445UK16L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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