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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:10,000
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Product details
Overview
MAX6447UK29L-T from Maxim Integrated is a single-supply, dual-manual-reset microprocessor supervisor IC with fixed 2.925V VCC reset threshold and extended (6.72s) + immediate (MR2) reset inputs. It features active-low push-pull RESET output, 6µA supply current, guaranteed valid reset down to VCC = 1.0V, and operates over -40°C to +85°C. Used in smart-card-detect and front-panel interrupt-before-reset systems.
For engineers reviewing the MAX6447UK29L-T datasheet, MAX6447UK29L-T pinout, MAX6447UK29L-T application, or MAX6447UK29L-T equivalent, this page delivers verified electrical parameters, exact pin functions for SOT23-5 package, real-world use cases including interrupt-before-reset and smart-card insertion detection, and two validated alternative parts with documented functional and timing differences.
Technical Context
The MAX6447UK29L-T integrates two distinct manual reset paths: MR1 requires a sustained low pulse of 6.72s (L-suffix) to trigger a 140ms min one-shot RESET pulse, while MR2 responds immediately to a rising edge with debounced assertion and 210ms internal deassertion debounce. Its fixed 2.925V VCC monitor ensures reliable brownout detection across industrial temperature range.
RESET output is push-pull active-low with VOL ≤ 0.3V at ISINK = 50–1.2mA, and the device guarantees proper logic state for VCC ≥ 1.0V. Internal 50kΩ pullups on MR1 and MR2 eliminate external components, and glitch rejection on MR2 is specified at 100ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±0.075V - precisely monitors 3.3V rail brownout without external adjustment |
| Supply Current (ICC) | 6µA typ at 3.6V - enables always-on supervision in battery-backed systems |
| MR1 Setup Period (tMR) | 6.72s typ - prevents nuisance resets from brief front-panel button presses |
| MR2 Response | Rising-edge triggered, 200ns delay - enables immediate system test or card-detect assertion |
| RESET Timeout Period | 140ms min / 210ms typ - meets µP minimum reset pulse width requirements |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin applications |
| VCC Range | 1.0V to 5.5V - supports valid RESET assertion even during deep brownout |
Pinout & Package
MAX6447UK29L-T is housed in a 5-pin SOT23 package (U5-1 outline), RoHS-compliant, tape-and-reel packaged. Pin 1 = GND, Pin 2 = VCC, Pin 3 = MR1, Pin 4 = RESET, Pin 5 = MR2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for all internal circuits; must be low-impedance connection |
| 2 VCC | Primary supply input | Power source and monitored voltage rail; powers internal circuitry and sets reset threshold reference |
| 3 MR1 | Extended manual reset input | Active-low input with 50kΩ internal pullup; requires ≥6.72s low pulse to assert RESET |
| 4 RESET | Active-low push-pull output | Drives µP reset pin directly; sinks up to 1.2mA at VCC ≥ 2.55V with VOL ≤ 0.3V |
| 5 MR2 | Immediate manual reset input | Active-high rising-edge triggered; asserts RESET on edge, debounced for 210ms on release |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset | MR1 enables secure long-press reset; MR2 enables instant card-detect or test assertion |
| Guaranteed reset at low VCC | Valid RESET logic asserted down to VCC = 1.0V - ensures reliability during deep power sag |
| Transient immunity | Rejects <20µs VCC glitches below threshold by ≥100mV - prevents false resets from noise |
| Zero-external-component interface | Internal 50kΩ MR1/MR2 pullups and push-pull RESET eliminate need for external resistors |
| Precision fixed threshold | 2.925V ±0.075V VCC monitor - matches standard 3.3V rail tolerance without trimming |
Applications
| Smart Card Insertion Detection | Front-Panel Interrupt-Before-Reset |
|---|---|
|
Use Scenario: Detecting physical insertion/removal of a smart card in set-top box or payment terminal. IC Role / Device Role / Timing Role: MR2 monitors card-sense switch; rising edge triggers immediate 140ms RESET pulse; internal 210ms MR2 deassertion debounce prevents false removal resets. Use Value: Eliminates need for external debounce circuitry; enables deterministic card-detect response within 200ns of edge detection. |
Use Scenario: Single pushbutton serving both system interrupt and hard reset functions in consumer electronics. IC Role / Device Role / Timing Role: MR1 connected to same button; short press (<6.72s) triggers µP interrupt only; long press (≥6.72s) asserts RESET for full restart. Use Value: Reduces BOM count and front-panel footprint; provides intuitive user interface with fail-safe reset escalation. |
| Industrial Equipment Power Sequencing | Medical Device Brownout Recovery |
|
Use Scenario: Ensuring safe startup/shutdown sequencing in programmable logic controllers with multiple voltage rails. IC Role / Device Role / Timing Role: Monitors primary 3.3V supply (VCC = 2.925V threshold); asserts RESET for 210ms after rail stabilizes to meet µP tRP requirement. Use Value: Prevents code execution during undervoltage; 6µA ICC minimizes impact on standby power budget. |
Use Scenario: Maintaining data integrity and safe shutdown during AC power interruption in portable diagnostic devices. IC Role / Device Role / Timing Role: Guarantees valid RESET assertion down to VCC = 1.0V; ensures µP enters known state before backup battery depletion. Use Value: Meets IEC 60601-1 safety requirements for controlled power-down; eliminates risk of corrupted EEPROM writes. |
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 package and threshold, but MR1 setup period reduced to 1.68s (T-suffix vs L-suffix) | Suitable where shorter user-press duration is acceptable; less immune to accidental reset | Select when faster manual reset response is prioritized over nuisance immunity |
| MAX6448UK29L-T | Identical electrical specs and timing, but open-drain RESET output instead of push-pull | Requires external pullup resistor; enables level-shifting to different logic voltages | Choose when interfacing to µPs with non-3.3V reset inputs or needing wired-OR reset bus capability |
Compared with MAX6447UK29L-T, MAX6447UK29T-T offers faster manual reset activation but reduced noise immunity, while MAX6448UK29L-T trades integrated push-pull drive for flexible open-drain interfacing-both require no PCB changes but differ in reset driver architecture and user interaction timing.
Availability
MAX6447UK29L-T is available at Aetrix Electronics and suitable for smart-card-detect systems, front-panel interrupt-before-reset interfaces, and industrial brownout monitoring requiring stable component supply, full temperature-range qualification, and long-term lifecycle support.
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) designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications, with emphasis on power management and sensor interface solutions.
The MAX6443–MAX6452 family was developed specifically for robust microprocessor supervision in noisy, space-constrained environments-delivering extended manual reset immunity, ultra-low quiescent current, and guaranteed operation across harsh temperature ranges.
FAQ
What is the exact VCC reset threshold voltage for MAX6447UK29L-T?
The MAX6447UK29L-T has a factory-trimmed VCC reset threshold of 2.925V, with ±0.075V tolerance over temperature. This value is defined by the "29" suffix per Table 1 and is guaranteed across the full -40°C to +85°C operating range. The threshold exhibits 60ppm/°C tempco and 2×VTH hysteresis, ensuring stable release point during voltage recovery.
How does the MR2 pin function on MAX6447UK29L-T?
On MAX6447UK29L-T, MR2 is an immediate-response, active-high manual reset input. A rising edge on MR2 triggers a 140ms minimum RESET pulse; the internal timer resets on each subsequent rising edge within the timeout window. MR2 also features 210ms deassertion debounce to prevent false releases during card removal, and 100ns glitch rejection on the input line.
Is MAX6447UK29L-T compatible with 1.8V microprocessors?
Yes, MAX6447UK29L-T is compatible with 1.8V µPs via its push-pull RESET output: VOH ≥ 0.8×VCC at ISOURCE = 200µA when VCC ≥ 1.8V, ensuring sufficient high-level drive. However, the VCC supply must be ≥1.0V for valid RESET assertion, and the 2.925V threshold applies only to the monitored 3.3V rail-not the µP's core voltage.
What package type and dimensions does MAX6447UK29L-T use?
MAX6447UK29L-T uses a 5-pin SOT23 package (package code U5-1, outline 21-0057). Its footprint measures 2.9mm × 1.6mm × 1.1mm (L×W×H), with 0.95mm pin pitch. The device is available in lead-free form (replacing "-T" with "+T") and is supplied in tape-and-reel format with 2500-piece minimum order quantity.
Does MAX6447UK29L-T require external components for basic operation?
No, MAX6447UK29L-T requires zero external components for core functionality: internal 50kΩ pullups on MR1 and MR2 eliminate external resistors, and the push-pull RESET output drives µP reset pins directly without pullup. Only optional features-like LED indicators or RSTIN monitoring (not used in this variant)-require external parts.
MAX6447UK29L-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- 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.
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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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