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Analog Devices Inc./Maxim Integrated MAX6447UK46L+T
- Part No.:
- MAX6447UK46L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6447UK46L+T.pdf
- Description:
- IC MPU RESET 4.625V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,179
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Product details
Overview
MAX6447UK46L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with dual manual reset inputs - one extended-setup (MR1) and one immediate-assertion (MR2) - designed for reliable system initialization in consumer and industrial electronics. It monitors VCC at 4.625V ±130mV threshold, delivers 140ms min reset timeout, consumes only 6µA typical supply current, and operates across -40°C to +85°C in a 5-pin SOT23 package.
For engineers reviewing the MAX6447UK46L+T datasheet, MAX6447UK46L+T pinout, MAX6447UK46L+T application, or MAX6447UK46L+T equivalent, key selection criteria include its dual-mode manual reset logic (6.72s extended MR1 + immediate MR2 edge-triggered pulse), guaranteed RESET validity down to VCC = 1.0V, push-pull active-low output, and immunity to <100ns glitches on MR2.
Technical Context
The MAX6447UK46L+T implements a precision bandgap-based voltage monitor for VCC with factory-trimmed 4.625V reset threshold (±130mV), 60ppm/°C tempco, and 2×VTH hysteresis. Its dual manual reset architecture separates long-duration system reset initiation (MR1, tMR = 6.72s typ) from instantaneous event signaling (MR2 rising-edge triggered, 200ns delay, 100ns glitch rejection).
Internally, MR1 features a 50kΩ pullup to VCC and debounces low-to-high transitions; MR2 is edge-sensitive with 210ms internal deassertion debounce and supports smart-card detect or interrupt-before-reset functions. The push-pull RESET output drives low for ≥140ms after valid assertion and remains functional down to VCC = 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±130mV - ensures reliable reset assertion during 4.5V–4.75V brownout conditions on main supply |
| Reset Timeout Period | 140ms (min) - guarantees sufficient processor hold time for full firmware reload or state recovery | Supply Current (ICC) | 6µA typ at 3.6V - enables ultra-low-power operation in battery-backed or energy-sensitive systems |
| MR1 Setup Period (tMR) | 6.72s (typ) - prevents nuisance resets from brief front-panel button presses |
| MR2 Glitch Rejection | 100ns - suppresses EMI-induced false triggers on immediate-reset input |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor and ensures defined logic level at all VCC ≥1.0V |
| Operating Temperature | -40°C to +85°C - qualified for industrial and extended-environment embedded applications |
Pinout & Package
Package: 5-pin SOT23 (U5+1), footprint-compatible with industry-standard 5-lead SC-74A layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output driver; must be low-impedance connection to system ground plane |
| 2 | VCC | Main power supply input (1.0V–5.5V); powers internal circuitry and serves as primary monitored voltage source |
| 3 | MR1 | Active-low manual reset input with 50kΩ internal pullup; requires ≥6.72s low assertion to trigger one-shot RESET pulse |
| 4 | RESET | Active-low push-pull output; sinks ≥1.2mA at VCC ≥2.55V; asserts for ≥140ms after valid reset condition |
| 5 | MR2 | Active-low manual reset input with immediate rising-edge response; generates RESET pulse on each MR2 low→high transition |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset | MR1 provides 6.72s extended setup for intentional system reset; MR2 enables immediate edge-triggered pulse for smart-card detect or test mode entry |
| Guaranteed RESET down to VCC = 1.0V | Ensures deterministic reset behavior during deep brownout - no external pulldown required for push-pull output |
| Low 6µA supply current | Minimizes standby power draw in always-on consumer devices such as set-top boxes and modems |
| 100ns MR2 glitch rejection | Eliminates need for external RC filtering on immediate-reset input, reducing BOM count and PCB area |
| 210ms MR2 deassertion debounce | Prevents false RESET pulses during mechanical switch bounce or card removal transients |
Applications
| Set-Top Box Power Management | DVD Player System Recovery |
|---|---|
Use Scenario: Front-panel power button press initiates soft interrupt if brief, hard reset if held >6.72s; MR2 detects HDMI hot-plug events. IC Role / Device Role / Timing Role: Supervisor IC providing dual-path reset control - MR1 for user-initiated full reboot, MR2 for peripheral hot-swap signaling. Use Value: Enables single-button interface for both UI navigation and system recovery without external logic or timing components. | Use Scenario: DVD tray open/close detection triggers immediate RESET pulse via MR2; MR1 used for service technician reset sequence. IC Role / Device Role / Timing Role: Dual-input reset supervisor coordinating mechanical event response (MR2) and maintenance reset (MR1). Use Value: Eliminates separate interrupt controller for tray sensor while maintaining secure, debounce-protected service reset path. |
| Cable Modem Firmware Update | Industrial HMI Panel Reset |
Use Scenario: During OTA firmware update, MR2 signals "update start" to host MCU; MR1 invoked only if update fails and full restart required. IC Role / Device Role / Timing Role: Reset supervisor enabling staged recovery - MR2 for non-disruptive status signaling, MR1 for last-resort full system reset. Use Value: Reduces risk of bricking during field updates by decoupling diagnostic signaling from destructive reset action. | Use Scenario: Touchscreen HMI panel uses MR1 for controlled shutdown/reboot sequence (6.72s hold); MR2 tied to emergency stop input for instant fault response. IC Role / Device Role / Timing Role: Safety-critical reset coordinator delivering immediate fault reaction (MR2) and deliberate operator-initiated restart (MR1). Use Value: Meets IEC 61508 functional safety requirements for dual-response timing without external watchdog or FPGA logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6447UK46T+T | tMR = 1.68s (vs. 6.72s); same pinout, threshold, and MR2 behavior | Suitable for applications requiring shorter manual reset hold time, e.g., portable devices with space-constrained buttons | Select when user interface design cannot accommodate 6.72s button press but retains identical dual-reset functionality |
| MAX6448UK46L+T | Open-drain RESET output (vs. push-pull); identical MR1/MR2 timing and threshold | Required where level-shifting or wired-OR reset bus configuration is needed | Choose when interfacing to mixed-voltage systems or sharing RESET line with other supervisors |
Compared with MAX6447UK46L+T, the MAX6447UK46T+T reduces manual reset setup time by 75% while preserving all other timing and electrical characteristics; the MAX6448UK46L+T maintains identical reset logic but replaces push-pull drive with open-drain, enabling flexible reset bus topologies at the cost of requiring an external pullup.
Availability
MAX6447UK46L+T is available at Aetrix Electronics and suitable for set-top boxes, cable/DSL modems, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6447UK46L+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 power, sensing, and interface applications, with emphasis on high-reliability, low-power solutions.
The MAX6443–MAX6452 family was developed to address nuisance reset immunity and dual-mode reset control in consumer and industrial embedded systems - specifically targeting front-panel interfaces, smart-card readers, and brownout-prone power domains.
FAQ
What is the exact reset threshold voltage for MAX6447UK46L+T?
The MAX6447UK46L+T has a factory-trimmed VCC reset threshold of 4.625V, with a guaranteed range of 4.50V to 4.75V over temperature and process variation. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" with suffix "46", and applies directly to the MAX6447UK46L+T device without calibration or external adjustment.
How does the MR2 input on MAX6447UK46L+T differ from MR1?
The MR2 input on MAX6447UK46L+T responds to rising-edge transitions with 200ns delay and 100ns glitch rejection, generating an immediate RESET pulse - unlike MR1, which requires a sustained low state for 6.72s. MR2 also features 210ms deassertion debounce to prevent false triggers during switch release or card removal, making it ideal for smart-card detect or emergency stop functions in the MAX6447UK46L+T.
Can MAX6447UK46L+T operate with VCC below 1.0V?
No - the MAX6447UK46L+T is not guaranteed to function correctly below VCC = 1.0V. Its RESET output is only specified to remain valid down to VCC = 1.0V, and internal comparators may behave unpredictably below this level. For applications requiring reset assertion at lower voltages, consider the MAX6449–MAX6452 series with adjustable RSTIN input, but note that MAX6447UK46L+T lacks RSTIN and is strictly a single-fixed-threshold device.
What package type and pin count does MAX6447UK46L+T use?
The MAX6447UK46L+T uses a 5-pin SOT23 package (package code U5+1), with pinout: 1=GND, 2=VCC, 3=MR1, 4=RESET, 5=MR2. This matches the standard SC-74A footprint and is documented in the Pin Configurations section of the MAX6443–MAX6452 datasheet - confirming physical compatibility and layout interchangeability with other 5-pin SOT23 supervisors.
Is MAX6447UK46L+T RoHS-compliant and lead-free?
Yes - the "+T" suffix in MAX6447UK46L+T explicitly denotes lead(Pb)-free, RoHS-compliant packaging per Maxim Integrated's ordering conventions. The device meets JEDEC J-STD-020 reflow profile requirements for lead-free soldering (peak 260°C), and land pattern information is available on maximintegrated.com/packages for the U5+1 outline.
MAX6447UK46L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- 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-23-5
MAX6447UK46L+T FAQ
1.How can I place an order for MAX6447UK46L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6447UK46L+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 MAX6447UK46L+T reliable?
The price and inventory of MAX6447UK46L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6447UK46L+T is usually 5 days.
3.What payment methods are accepted for MAX6447UK46L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6447UK46L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6447UK46L+T?
MAX6447UK46L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6447UK46L+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 MAX6447UK46L+T?
For technical support, including MAX6447UK46L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6447UK46L+T requirements.
6.How does Aetrix verify that MAX6447UK46L+T is sourced from the original manufacturer or authorized distributors?
All MAX6447UK46L+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 MAX6447UK46L+T meets industry standards.
7.What is the process for return or replacement of MAX6447UK46L+T?
All MAX6447UK46L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6447UK46L+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 MAX6447UK46L+T part is unused and in its original packaging.
Return procedure for MAX6447UK46L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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