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Analog Devices Inc./Maxim Integrated MAX6447UK29L+T
- Part No.:
- MAX6447UK29L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6447UK29L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
MAX6447UK29L+T from Maxim Integrated is a precision single-supply microprocessor supervisor IC with dual manual reset inputs-one extended-setup (MR1) and one immediate-assertion (MR2)-and a fixed 2.925V VCC reset threshold. It delivers a 140ms minimum reset timeout, 6µA supply current, and guaranteed valid reset output down to VCC = 1.0V. It is used in consumer electronics like DVD players and cable modems to prevent spurious resets during front-panel button presses.
For engineers reviewing the MAX6447UK29L+T datasheet, MAX6447UK29L+T pinout, MAX6447UK29L+T application, or MAX6447UK29L+T equivalent, key selection criteria include its dual-mode manual reset logic (6.72s extended + immediate edge-triggered), SOT23-5 package compatibility, push-pull RESET output, and immunity to <100ns MR2 glitches-critical for smart-card detect and interrupt-before-reset designs.
Technical Context
The MAX6447UK29L+T integrates two independent manual reset paths: MR1 requires a sustained low pulse of 6.72s (L-suffix) to trigger a one-shot 140ms RESET assertion, while MR2 responds immediately to a rising edge with internal 210ms debouncing on deassertion. Its VCC monitor uses a factory-trimmed 2.925V threshold with ±0.075V tolerance and 60ppm/°C tempco.
It features a push-pull active-low RESET output capable of sinking 1.2mA at VCC ≥ 2.55V, operates across -40°C to +85°C, and draws only 6µA typical supply current at 3.6V. The device ignores transients <100ns on MR2 and tolerates VCC glitches as short as 20µs when falling 100mV below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±0.075V - ensures reliable brownout detection for 3.3V systems with margin against noise |
| Reset Timeout Period | 140ms (min) - guarantees sufficient processor initialization time before release | Manual Reset Setup (MR1) | 6.72s (L-suffix) - prevents nuisance resets from brief front-panel switch closures |
| MR2 Response | Rising-edge triggered - enables immediate system test or smart-card insertion detection |
| Supply Current | 6µA (typ at 3.6V) - supports ultra-low-power battery-backed or always-on monitoring |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and consumer equipment environments |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor in most µP interfaces |
Pinout & Package
MAX6447UK29L+T is housed in a 5-pin SOT23 package (package code U5+1), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 is GND; pin 2 is VCC; pin 3 is MR1; pin 4 is RESET; pin 5 is MR2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for all internal circuitry and reset timing references |
| 2 (VCC) | Power supply input | Primary monitored voltage rail; powers internal comparators and logic; valid reset asserted down to 1.0V |
| 3 (MR1) | Extended manual reset input | Active-low input with internal 50kΩ pullup; must be held low ≥6.72s to assert RESET |
| 4 (RESET) | Active-low reset output | Push-pull driver; asserts low for ≥140ms after MR1 or MR2 activation; sinks 1.2mA at VCC ≥2.55V |
| 5 (MR2) | Immediate manual reset input | Active-high edge-triggered input; rising edge pulses RESET immediately; debounced for 210ms on release |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset | MR1 provides 6.72s extended setup for secure system reset; MR2 enables instant response for card-detect or test functions |
| Glitch-immune MR2 input | Rejects <100ns noise pulses-eliminates false triggers from mechanical switch bounce or EMI |
| Low-power operation | 6µA typical ICC allows integration into energy-sensitive applications without impacting standby budget |
| Valid reset at low VCC | Guaranteed RESET logic state down to VCC = 1.0V-ensures deterministic behavior during deep brownout |
| Factory-trimmed accuracy | ±0.075V threshold tolerance at 2.925V enables precise power-rail monitoring without calibration |
Applications
| Smart Card Detection | Front-Panel Interrupt/Reset |
|---|---|
Use Scenario: Detecting insertion/removal of a smart card in set-top box or payment terminal. IC Role / Device Role / Timing Role: MR2 monitors card-insertion switch; rising edge triggers immediate 140ms RESET pulse; MR2 debounced 210ms on release prevents false removal resets. Use Value: Enables hardware-level card presence signaling without µP polling-reducing latency and firmware overhead. | Use Scenario: Single pushbutton serving both system interrupt and hard reset in DVD player remote interface. IC Role / Device Role / Timing Role: MR1 connected to same button; short press (<6.72s) asserts NMI/interrupt; long press (≥6.72s) asserts full RESET. Use Value: Eliminates need for separate buttons or external timing logic-reducing BOM count and PCB area. |
| Industrial Modem Power Sequencing | Cable/DSL Modem Brownout Recovery |
Use Scenario: Ensuring clean boot sequence after AC power restoration in embedded modem hardware. IC Role / Device Role / Timing Role: VCC monitor watches 3.3V rail; asserts RESET until rail stabilizes >2.925V for 210ms (typ); prevents premature CPU execution. Use Value: Avoids corrupted firmware load or register misconfiguration caused by marginal supply voltage. | Use Scenario: Recovering from transient line sags in broadband access equipment without requiring user intervention. IC Role / Device Role / Timing Role: Immunity to 20µs VCC transients falling 100mV below threshold prevents spurious resets during grid fluctuations. Use Value: Maintains service continuity and reduces field-reported "random reboot" failures in deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6447UK29T+T | Same 2.925V threshold and dual MR architecture, but MR1 setup period reduced to 1.68s (T-suffix) | Less secure against accidental reset; suitable where faster user-initiated reset is preferred | Select when shorter manual reset hold time improves UX without compromising reliability |
| TPS3808G33DBVR | Single MR input, 3.08V threshold, 200ms timeout, 2.5µA ICC; no immediate MR2 function | Lacks dual-mode reset capability; requires external logic for edge-triggered functions | Choose for cost-sensitive, single-reset applications where MR2 functionality is unnecessary |
Compared with MAX6447UK29L+T, the L-suffix variant offers superior nuisance-reset immunity via its 6.72s MR1 hold requirement, while the T-suffix alternative trades security for responsiveness; the TPS3808G33DBVR provides lower quiescent current but omits the critical immediate MR2 path needed for smart-card or test-mode use cases.
Availability
MAX6447UK29L+T is available at Aetrix Electronics and suitable for consumer electronics, industrial modems, and medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6447UK29L+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer markets.
The MAX6443–MAX6452 family was designed to solve unreliable reset behavior in systems using mechanical switches-delivering extended manual reset setup periods, dual-mode reset inputs, and robust transient immunity for set-top boxes, modems, and portable electronics.
FAQ
What is the exact reset threshold voltage for MAX6447UK29L+T?
The MAX6447UK29L+T has a factory-set VCC reset threshold of 2.925V, with a guaranteed tolerance of ±0.075V (2.85V to 3.00V) over temperature. This value is confirmed in Table 1 of the datasheet under suffix "29", and applies specifically to the MAX6447UK29L+T-not derived from family averages or adjacent variants.
How does the MR2 pin function on MAX6447UK29L+T?
The MR2 pin on MAX6447UK29L+T is an immediate-assertion, rising-edge-triggered manual reset input. A low-to-high transition pulses the RESET output low for ≥140ms. MR2 is internally debounced for 210ms on release to prevent false deassertion due to contact bounce-making it ideal for smart-card detect or test-mode activation in the MAX6447UK29L+T.
What package type and pin count does MAX6447UK29L+T use?
MAX6447UK29L+T uses a 5-pin SOT23 package (outline 21-0057), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, pin 4 = RESET, and pin 5 = MR2. This matches the MAX6445/MAX6446/MAX6447/MAX6448 group per the Pin Configurations section and is explicitly listed in the Ordering Information table.
Is MAX6447UK29L+T compatible with 1.8V microcontrollers?
Yes-MAX6447UK29L+T's push-pull RESET output is specified to drive high to ≥0.8×VCC when VCC ≥ 1.8V and sourcing 200µA, ensuring logic-high compatibility with 1.8V µP reset inputs. Its VCC operating range (1.0V to 5.5V) and guaranteed reset validity down to VCC = 1.0V further confirm interoperability in mixed-voltage systems using the MAX6447UK29L+T.
Does MAX6447UK29L+T support open-drain RESET output?
No-MAX6447UK29L+T is configured with a push-pull RESET output, as indicated by its part number suffix "+T" and confirmed in the Selector Guide table (row MAX6447 shows "✔" under "PUSH-PULL RESET" and "-" under "OPEN-DRAIN RESET"). Open-drain variants exist in the family (e.g., MAX6448), but MAX6447UK29L+T exclusively uses push-pull logic.
MAX6447UK29L+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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
MAX6447UK29L+T FAQ
1.How can I place an order for MAX6447UK29L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6447UK29L+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 MAX6447UK29L+T reliable?
The price and inventory of MAX6447UK29L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6447UK29L+T is usually 5 days.
3.What payment methods are accepted for MAX6447UK29L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6447UK29L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6447UK29L+T?
MAX6447UK29L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6447UK29L+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 MAX6447UK29L+T?
For technical support, including MAX6447UK29L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6447UK29L+T requirements.
6.How does Aetrix verify that MAX6447UK29L+T is sourced from the original manufacturer or authorized distributors?
All MAX6447UK29L+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 MAX6447UK29L+T meets industry standards.
7.What is the process for return or replacement of MAX6447UK29L+T?
All MAX6447UK29L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6447UK29L+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 MAX6447UK29L+T part is unused and in its original packaging.
Return procedure for MAX6447UK29L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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