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Analog Devices Inc./Maxim Integrated MAX6448UK16L+T
- Part No.:
- MAX6448UK16L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6448UK16L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,800
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Product details
Overview
The MAX6448UK16L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor supervisory circuit with one extended-setup manual reset input (MR1) and one immediate-assertion manual reset input (MR2), 1.575V VCC reset threshold, 6.72s MR1 setup period, active-low open-drain RESET output, and guaranteed operation from -40°C to +85°C. It prevents nuisance resets in consumer electronics power-up sequencing and front-panel control systems.
For engineers reviewing the MAX6448UK16L+T datasheet, MAX6448UK16L+T pinout, MAX6448UK16L+T application, or MAX6448UK16L+T equivalent, key selection concerns include its dual-mode manual reset logic (extended vs. immediate), low 6µA supply current at 3.6V, immunity to <100ns glitches on MR2, and compatibility with 1.0V–5.5V VCC operation while asserting valid RESET down to VCC = 1.0V.
Technical Context
This device implements a precision bandgap-based voltage monitor for VCC with factory-trimmed 1.575V threshold (±1.5% over temperature), combined with two independent manual reset inputs: MR1 requires a sustained 6.72s low assertion before triggering a 140ms minimum one-shot RESET pulse, while MR2 responds immediately to a rising edge with internal 210ms debouncing on deassertion.
The open-drain RESET output supports level-shifting via external pullup (≥20kΩ to VCC or other rail), and the IC maintains functional reset assertion even as VCC decays to 1.0V - critical for brownout detection in battery-powered set-top boxes and portable media players.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.575V ±1.5% - precisely monitors 1.6V nominal rails without external components |
| MR1 Setup Period | 6.72s typ - eliminates accidental resets from brief front-panel button presses |
| RESET Timeout Period | 140ms min - ensures sufficient processor reset hold time per JEDEC JESD8-12 |
| Supply Current | 6µA at 3.6V - enables multi-year battery life in always-on consumer remote controls |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin environments |
| MR2 Glitch Rejection | 100ns - rejects contact bounce and ESD-induced transients on smart-card detect lines |
| VCC to RESET Delay | 20µs - provides fast response to supply droop during dynamic load switching |
Pinout & Package
MAX6448UK16L+T is housed in a 5-pin SOT23 package (U5+1 outline, 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage |
| 2 | VCC | Main supply input and monitored voltage source; powers internal circuitry |
| 3 | MR1 | Active-low manual reset with internal 50kΩ pullup; requires 6.72s low to trigger RESET |
| 4 | RESET | Active-low open-drain output; requires external pullup resistor ≥20kΩ |
| 5 | MR2 | Active-high immediate manual reset; rising edge triggers 140ms RESET pulse |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset logic | MR1 enables secure long-press system reset; MR2 supports instant smart-card insertion detection |
| Factory-trimmed 1.575V threshold | Eliminates need for external resistive divider when monitoring 1.6V core supplies |
| 210ms MR2 deassertion debounce | Prevents false resets during mechanical switch release or card ejection transients |
| Valid RESET down to VCC = 1.0V | Ensures deterministic processor reset behavior during deep brownout conditions |
| 6µA typical supply current | Reduces quiescent power in always-on standby circuits without compromising reset accuracy |
Applications
| Set-Top Box Power Sequencing | DVD Player Front-Panel Control |
|---|---|
|
Use Scenario: Coordinating cold start of main SoC, tuner, and HDMI controller after AC power restoration. IC Role / Device Role / Timing Role: Supervises 1.6V SoC core rail and asserts synchronized RESET pulse only after stable VCC and validated MR1 press. Use Value: Prevents partial initialization and firmware lockup caused by premature release of reset signal during marginal supply ramp. |
Use Scenario: Enabling both momentary function keys (volume, menu) and intentional hard reset via same physical button. IC Role / Device Role / Timing Role: MR1 interprets >6.72s press as system reset; MR2 detects rising edge on eject sensor for immediate tray motor stop. Use Value: Eliminates need for separate hardware reset button and reduces BOM count by 1 discrete component. |
| DSL Modem Firmware Recovery | MP3 Player Smart-Card Interface |
|
Use Scenario: Remote recovery of corrupted firmware via ISP mode triggered by sustained front-panel button press. IC Role / Device Role / Timing Role: MR1 initiates 140ms RESET pulse that forces bootloader entry; VCC monitor ensures reset occurs only if 3.3V rail is stable. Use Value: Guarantees reliable recovery sequence without requiring host MCU intervention or external timing circuitry. |
Use Scenario: Detecting SD card insertion/removal in portable audio players with zero false triggers. IC Role / Device Role / Timing Role: MR2 connected to card-detect switch; rising edge triggers immediate RESET pulse to halt I/O and reinitialize card interface. Use Value: Enables sub-200ms card hot-swap response while rejecting mechanical bounce via built-in 210ms debounce. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6447UK16L+T | Same 1.575V threshold and 6.72s MR1, but push-pull RESET output instead of open-drain | Requires no external pullup; unsuitable for level-shifting or wired-OR configurations | Select when driving CMOS inputs directly and minimizing external components |
| MAX6448UK16T+T | Identical functionality but with 1.68s MR1 setup period (T suffix) instead of 6.72s (L suffix) | Better suited for user-interface reset actions requiring faster response than 6.72s | Select when balancing reset security against usability in handheld devices |
Compared with MAX6448UK16L+T, MAX6447UK16L+T trades open-drain flexibility for simpler board layout, while MAX6448UK16T+T reduces MR1 setup time by 75% - enabling quicker recovery in applications where long-press security is less critical than responsiveness.
Availability
MAX6448UK16L+T is available at Aetrix Electronics and suitable for set-top box power sequencing, DVD player front-panel control, and DSL modem firmware recovery requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for MAX6448UK16L+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in cost-sensitive consumer electronics, emphasizing glitch immunity, ultra-low quiescent current, and flexible manual reset architectures.
FAQ
What is the exact reset threshold voltage of the MAX6448UK16L+T?
The MAX6448UK16L+T has a factory-trimmed VCC reset threshold of 1.575V, with ±1.5% tolerance over the full -40°C to +85°C operating range. This value is confirmed in Table 1 of the datasheet under suffix "16", and applies specifically to the MAX6448UK16L+T - not to other variants in the MAX6443–MAX6452 family.
How does the MR2 input behave on the MAX6448UK16L+T?
On the MAX6448UK16L+T, MR2 is an active-high immediate manual reset input: a rising edge triggers a 140ms minimum one-shot RESET pulse. Its deassertion is internally debounced for 210ms to prevent false resets during switch release. MR2 does not require a sustained low condition - unlike MR1, which needs 6.72s of assertion.
Can the MAX6448UK16L+T operate with VCC below 1.6V?
Yes - the MAX6448UK16L+T is fully specified from VCC = 1.0V to 5.5V. Its 1.575V reset threshold remains valid down to VCC = 1.0V, and the RESET output is guaranteed functional (active-low, open-drain) across this entire range. Below 1.0V, reset assertion is not guaranteed.
What package type and pin count does the MAX6448UK16L+T use?
The MAX6448UK16L+T uses a 5-pin SOT23 package (package code U5+1, outline 21-0057), with pinout: 1=GND, 2=VCC, 3=MR1, 4=RESET, 5=MR2. This matches the mechanical dimensions and land pattern defined in Maxim's Package Information document #90-0174.
Is the MAX6448UK16L+T RoHS-compliant and lead-free?
Yes - the "+T" suffix in MAX6448UK16L+T explicitly denotes lead(Pb)-free, RoHS-compliant packaging. All standard versions of this part are shipped in tape-and-reel format with 2500-piece minimum order quantity, and comply with JEDEC J-STD-020 moisture sensitivity level 1.
MAX6448UK16L+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:
- 1.575V
- Output:
- Open Drain or Open Collector
- 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
MAX6448UK16L+T FAQ
1.How can I place an order for MAX6448UK16L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6448UK16L+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 MAX6448UK16L+T reliable?
The price and inventory of MAX6448UK16L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6448UK16L+T is usually 5 days.
3.What payment methods are accepted for MAX6448UK16L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6448UK16L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6448UK16L+T?
MAX6448UK16L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6448UK16L+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 MAX6448UK16L+T?
For technical support, including MAX6448UK16L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6448UK16L+T requirements.
6.How does Aetrix verify that MAX6448UK16L+T is sourced from the original manufacturer or authorized distributors?
All MAX6448UK16L+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 MAX6448UK16L+T meets industry standards.
7.What is the process for return or replacement of MAX6448UK16L+T?
All MAX6448UK16L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6448UK16L+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 MAX6448UK16L+T part is unused and in its original packaging.
Return procedure for MAX6448UK16L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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