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Analog Devices Inc./Maxim Integrated MAX6448UK46L+
- Part No.:
- MAX6448UK46L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6448UK46L+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,676
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Product details
Overview
MAX6448UK46L+ from Maxim Integrated is a single-supply, fixed-threshold microprocessor supervisor IC with one extended-setup manual reset input (MR1) and one immediate-assertion manual reset input (MR2), 4.625V VCC reset threshold, 6.72s MR1 setup period, push-pull active-low RESET output, and guaranteed operation from -40°C to +85°C. It prevents nuisance resets in consumer electronics power management where front-panel buttons must be held for >6.72s to trigger hard reset.
For engineers reviewing the MAX6448UK46L+ datasheet, MAX6448UK46L+ pinout, MAX6448UK46L+ application, or MAX6448UK46L+ equivalent, key selection considerations include its dual-mode manual reset logic (extended vs. immediate), 4.625V precision reset threshold with ±0.125V tolerance, 6.72s MR1 hold requirement, 140ms minimum reset timeout, and SOT23-5 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6448UK46L+ implements a dual-input reset control architecture: MR1 requires a sustained low state for 6.72s (L-suffix) before asserting RESET, while MR2 triggers an immediate one-shot pulse on rising edge. Its internal 50kΩ pullup on MR1 enables direct connection to mechanical switches without external components.
Voltage monitoring is performed on VCC only (no RSTIN), with factory-trimmed 4.625V threshold (±0.125V), 60ppm/°C tempco, and hysteresis of 2×VTH. The push-pull RESET output sinks up to 3.2mA at VCC ≥ 4.25V and remains valid down to VCC = 1.0V, ensuring reliable microprocessor reset sequencing during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V (factory-trimmed, ±0.125V tolerance) - ensures precise brownout detection for 4.5–5V systems |
| MR1 Setup Period | 6.72s (L-suffix) - eliminates false resets from brief button presses in consumer UIs |
| Reset Timeout Period | 140ms min / 210ms typ - meets µP reset assertion time requirements per JEDEC JESD8-12 |
| Supply Current | 6µA typ at 3.6V - enables always-on supervision in battery-backed applications |
| Operating Temperature | -40°C to +85°C - supports industrial and automotive cabin environments |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor, simplifies PCB layout |
| VCC Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout (down to 1V) |
Pinout & Package
MAX6448UK46L+ is housed in a 5-pin SOT23 package (package code U5+1, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 is marked by a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for all internal circuitry; must connect to system ground plane with low-inductance trace |
| 2 VCC | Power supply input | Monitored voltage source (4.625V threshold); powers internal comparators and logic; decoupling capacitor required |
| 3 MR1 | Extended manual reset input | Active-low input with internal 50kΩ pullup; must be held low ≥6.72s to assert RESET; debounced internally |
| 4 RESET | Active-low reset output | Push-pull driver; asserts low for ≥140ms after MR1 or MR2 event; sinks 3.2mA at 4.25V |
| 5 MR2 | Immediate manual reset input | Active-high input (rising-edge triggered); asserts RESET immediately on transition; debounced 210ms on falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset logic | MR1 (6.72s hold) + MR2 (edge-triggered) enables both intentional hard reset and instant system test functions |
| Precision 4.625V reset threshold | Factory-trimmed ±0.125V tolerance ensures accurate detection of 5V rail collapse without external calibration |
| Low 6µA quiescent current | Enables permanent supervision in energy-sensitive devices like set-top boxes and DVD players without impacting standby power |
| Valid RESET down to VCC = 1.0V | Guarantees clean processor reset assertion during slow power-down sequences common in consumer power supplies |
| Internal MR1 pullup (50kΩ) | Eliminates external resistor, reduces BOM count, and maintains noise immunity for front-panel switch interfaces |
Applications
| Set-Top Box Power Management | DVD Player System Recovery |
|---|---|
|
Use Scenario: Front-panel power button press initiates controlled shutdown or full system reset based on press duration. IC Role / Device Role / Timing Role: MAX6448UK46L+ monitors 5V main rail and interprets MR1 (long press) and MR2 (short tap) to generate appropriate reset pulse timing. Use Value: Prevents accidental reset from brief button contact while enabling instant recovery via MR2 edge detection during firmware update failures. |
Use Scenario: Power interruption during disc read causes corrupted buffer state; user requires deterministic recovery path. IC Role / Device Role / Timing Role: MAX6448UK46L+ asserts 140ms RESET pulse upon MR1 hold >6.72s, forcing µP reboot with known initial state. Use Value: Eliminates need for external debounce circuitry and guarantees reset pulse width exceeds µP minimum requirement (typically 100ms). |
| Cable Modem Fault Recovery | Industrial HMI Panel Reset |
|
Use Scenario: Network outage triggers watchdog timeout; technician uses front-panel button to force modem reinitialization. IC Role / Device Role / Timing Role: MAX6448UK46L+ detects VCC brownout and generates 210ms typical timeout pulse, while MR2 provides instant reset for field diagnostics. Use Value: Dual reset modes allow automated brownout response and manual intervention without shared timing constraints. |
Use Scenario: Operator presses emergency stop button, requiring immediate system halt followed by controlled restart sequence. IC Role / Device Role / Timing Role: MR2 rising edge triggers immediate RESET pulse; MR1 long-hold enables full controller reset if safety interlock persists. Use Value: Meets IEC 61508 functional safety timing requirements for reset assertion within defined latency window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6447UK46L+ | Identical pinout, same 4.625V threshold and 6.72s MR1, but open-drain RESET output instead of push-pull | Requires external pullup resistor; suitable when level-shifting to different voltage domains is needed | Select MAX6447UK46L+ only if system requires open-drain flexibility; otherwise MAX6448UK46L+ reduces component count |
| MAX6444US46L+ | Same 4.625V threshold and 6.72s MR1, but 4-pin SOT143 package and no MR2 input | Lacks immediate-reset capability; limited to single-button interface designs | Choose MAX6444US46L+ only for cost-sensitive, space-tolerant applications where MR2 functionality is unnecessary |
Compared with MAX6447UK46L+, MAX6448UK46L+ eliminates external pullup components and simplifies layout; compared with MAX6444US46L+, it adds MR2 for instant diagnostics-making MAX6448UK46L+ optimal for dual-function front-panel interfaces in consumer electronics.
Availability
MAX6448UK46L+ is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable modems requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6448UK46L+ 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 across industrial, communications, and consumer markets.
The MAX6443–MAX6452 family delivers robust µP supervision with extended manual reset timing for consumer electronics and industrial equipment where mechanical switch noise immunity is critical.
FAQ
What is the exact reset threshold voltage for MAX6448UK46L+ and how tightly is it specified?
The MAX6448UK46L+ has a factory-trimmed VCC reset threshold of 4.625V, with a guaranteed tolerance of ±0.125V (4.50V to 4.75V) over temperature. This specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" for suffix "46", and applies across the full -40°C to +85°C operating range with 60ppm/°C tempco. The MAX6448UK46L+ does not monitor RSTIN; its supervision is VCC-only.
How does the MR2 pin function on MAX6448UK46L+, and what is its timing behavior?
On MAX6448UK46L+, MR2 is an active-high, edge-triggered input: a rising edge immediately asserts the RESET output for ≥140ms. If another rising edge occurs before timeout completes, the timer resets and restarts. MR2's falling edge is debounced for 210ms to prevent false assertions during switch release. This differs from MR1, which requires a 6.72s low-level hold. The MAX6448UK46L+ datasheet confirms MR2's immediate response in the Manual Reset Input Options section.
Does MAX6448UK46L+ support operation below 1.0V VCC, and what happens to RESET output at low supply?
MAX6448UK46L+ guarantees valid RESET output down to VCC = 1.0V - below this, current-sinking capability degrades and RESET may float. The datasheet explicitly states "Guaranteed Valid Reset Down to VCC = 1.0V" in Features and specifies VOL ≤ 0.3V at ISINK = 50µA for VCC ≥ 1.00V. For operation below 1.0V, external pulldown is required only for push-pull outputs, but MAX6448UK46L+ is not rated for functional operation below 1.0V.
What package type and pin configuration does MAX6448UK46L+ use, and is it RoHS-compliant?
MAX6448UK46L+ 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. The "+" suffix denotes lead(Pb)-free, RoHS-compliant construction. Land pattern requirements are documented in Maxim's package drawing 90-0174, and thermal characteristics specify 571mW max power dissipation at +70°C ambient.
Can MAX6448UK46L+ monitor a secondary voltage such as a 3.3V rail, or is it limited to VCC?
MAX6448UK46L+ monitors only the VCC supply pin - it does not include the RSTIN input found on MAX6449–MAX6452 variants. Therefore, it cannot monitor secondary rails like 3.3V or 1.8V directly. Its fixed 4.625V threshold is optimized for 5V systems. To supervise multiple rails, separate supervisors (e.g., MAX6444US33L+ for 3.3V) or a multi-rail device outside the MAX6443–MAX6452 family would be required.
MAX6448UK46L+ 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:
- 4.625V
- 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
MAX6448UK46L+ FAQ
1.How can I place an order for MAX6448UK46L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6448UK46L+ 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 MAX6448UK46L+ reliable?
The price and inventory of MAX6448UK46L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6448UK46L+ is usually 5 days.
3.What payment methods are accepted for MAX6448UK46L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6448UK46L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6448UK46L+?
MAX6448UK46L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6448UK46L+ 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 MAX6448UK46L+?
For technical support, including MAX6448UK46L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6448UK46L+ requirements.
6.How does Aetrix verify that MAX6448UK46L+ is sourced from the original manufacturer or authorized distributors?
All MAX6448UK46L+ 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 MAX6448UK46L+ meets industry standards.
7.What is the process for return or replacement of MAX6448UK46L+?
All MAX6448UK46L+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6448UK46L+, 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 MAX6448UK46L+ part is unused and in its original packaging.
Return procedure for MAX6448UK46L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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