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Analog Devices Inc./Maxim Integrated MAX6448UK31L+T
- Part No.:
- MAX6448UK31L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6448UK31L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,793
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Product details
Overview
MAX6448UK31L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with one extended-setup manual reset input (MR1) and one immediate-assertion manual reset input (MR2), 3.075V 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 systems where front-panel buttons must be held for extended durations to trigger hard reset.
For engineers reviewing the MAX6448UK31L+T datasheet, MAX6448UK31L+T pinout, MAX6448UK31L+T application, or MAX6448UK31L+T equivalent, key selection considerations include its dual-mode manual reset logic (extended vs. immediate), 3.075V precision reset threshold, 6.72s validated MR1 hold time, push-pull RESET drive capability down to VCC = 1.0V, and SOT23-5 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6448UK31L+T 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 RESET pulse on rising edge-debounced for 210ms to suppress false assertions during card insertion/removal events. Its internal 50kΩ pullup on MR1 enables direct switch connection without external components.
It monitors only VCC (not RSTIN), uses a factory-trimmed 3.075V reset threshold with ±0.075V tolerance and 60ppm/°C tempco, and guarantees valid RESET assertion down to VCC = 1.0V. The push-pull RESET output sinks up to 1.2mA at VCC ≥ 2.55V and maintains logic integrity across the full -40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.075V ±0.075V - precise brownout detection point for 3.3V rail supervision |
| MR1 Setup Period | 6.72s typ - eliminates accidental resets from brief button presses in user interfaces |
| RESET Timeout Period | 140ms min / 210ms typ - ensures sufficient processor initialization time after power recovery |
| Supply Current | 6µA typ at 3.6V - ultra-low quiescent current for battery-backed or always-on systems |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin applications |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor in most µP reset circuits |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
Pinout & Package
MAX6448UK31L+T is housed in a 5-pin SOT23 package (package code U5+1), footprint-compatible with industry-standard SOT23-5 land patterns (Maxim land pattern 90-0174). 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 external switch connections |
| 2 VCC | Supply voltage input | Primary monitored rail and power source for internal comparators and timing logic |
| 3 MR1 | Extended manual reset input | Active-low input requiring 6.72s low assertion to trigger one-shot RESET; internally pulled up to VCC via 50kΩ |
| 4 RESET | Active-low reset output | Push-pull driver capable of sinking 1.2mA at VCC ≥ 2.55V; asserts low for 140ms min after valid reset event |
| 5 MR2 | Immediate manual reset input | Active-high input - rising edge triggers immediate RESET pulse; debounced for 210ms to reject contact bounce |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset logic | MR1 provides 6.72s extended hold for intentional system reset; MR2 delivers immediate response for smart-card detect or test functions |
| Precision 3.075V reset threshold | Factory-trimmed ±0.075V tolerance ensures reliable 3.3V rail monitoring without external calibration |
| Guaranteed RESET validity to VCC = 1.0V | Enables robust reset signaling during severe brownout-no external pulldown required for push-pull output |
| 6µA typical supply current | Minimizes standby power draw in always-on consumer devices like set-top boxes and modems |
| 210ms typical reset timeout | Provides adequate deassertion delay for microprocessor clock stabilization and memory initialization |
Applications
| Set-Top Box Power Management | DVD Player Front-Panel Control |
|---|---|
Use Scenario: Front-panel power button must distinguish between short press (menu wake-up) and long press (full system reset). IC Role / Device Role / Timing Role: MAX6448UK31L+T acts as dual-mode reset arbiter: MR2 detects short button closure for interrupt; MR1 enforces 6.72s hold for hard reset. Use Value: Eliminates need for separate interrupt controller and reset supervisor, reducing BOM count and PCB area. |
Use Scenario: User presses channel-up/down button during playback; system must avoid unintended reset from mechanical switch bounce. IC Role / Device Role / Timing Role: MAX6448UK31L+T supervises 3.3V main rail and uses MR1's 6.72s setup period to reject transient closures. Use Value: Prevents data corruption and playback interruption caused by false resets during normal UI interaction. |
| Cable Modem System Recovery | Industrial HMI Panel Reset |
Use Scenario: Remote technician initiates firmware update; modem must perform controlled reboot after download completes. IC Role / Device Role / Timing Role: MAX6448UK31L+T receives software-triggered MR2 signal to assert immediate RESET pulse, synchronized with bootloader readiness. Use Value: Enables deterministic, software-controlled restart without relying on µP's internal reset generation-critical for field-upgrade reliability. |
Use Scenario: Maintenance personnel access service mode via physical key switch; system requires verified long-press to enter diagnostic reset. IC Role / Device Role / Timing Role: MAX6448UK31L+T monitors 24V-derived 3.3V rail and validates 6.72s MR1 press before enabling service-mode reset sequence. Use Value: Enforces deliberate operator action to prevent accidental entry into privileged diagnostic states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6447UK31L+T | Identical pinout, same 3.075V threshold and 6.72s MR1 setup, but open-drain RESET output | Requires external pullup resistor; less suitable for µPs with weak internal pullups or high-noise environments | Select when level-shifting or interfacing to multiple voltage domains is needed |
| MAX6444US31L+T | SOT143-4 package, same 3.075V threshold and 6.72s setup, push-pull RESET, no MR2 input | Lacks immediate-reset MR2 functionality; limited to single-button reset architectures | Select when board space allows larger SOT143 and dual-mode reset is unnecessary |
Compared with MAX6447UK31L+T, MAX6448UK31L+T offers superior noise immunity and drive strength via push-pull RESET; compared with MAX6444US31L+T, it adds MR2 for flexible system-level test and card-detect integration-making it optimal for compact, feature-rich consumer HMI designs.
Availability
MAX6448UK31L+T is available at Aetrix Electronics and suitable for set-top box power sequencing, DVD player front-panel control, and cable modem system recovery requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6448UK31L+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 management, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX6443–MAX6452 family was engineered to solve nuisance reset issues in user-interactive electronics, delivering robust dual-mode manual reset logic and ultra-low-power supervision for 3.3V and 5V systems.
FAQ
What is the exact reset threshold voltage of the MAX6448UK31L+T?
The MAX6448UK31L+T has a factory-set VCC reset threshold of 3.075V, with a guaranteed tolerance of ±0.075V over temperature. This value is defined by the "31" suffix per Table 1 in the datasheet and is optimized for reliable supervision of standard 3.3V power rails in consumer and industrial equipment.
How does the MR2 input on the MAX6448UK31L+T function differently from MR1?
The MR2 input on the MAX6448UK31L+T responds to a rising edge with immediate one-shot RESET assertion, debounced for 210ms to reject contact bounce. In contrast, MR1 requires a sustained low state for 6.72 seconds (L-suffix) before triggering RESET-enabling distinct use cases such as smart-card detect (MR2) and deliberate system reset (MR1).
Is the RESET output of the MAX6448UK31L+T push-pull or open-drain?
The MAX6448UK31L+T features a push-pull RESET output, confirmed by its "U" prefix in the ordering code (MAX6448UK31L+T) and the functional diagram in the datasheet. This eliminates the need for an external pullup resistor and provides stronger drive capability than open-drain alternatives like the MAX6447UK31L+T.
What package type and pin count does the MAX6448UK31L+T use?
The MAX6448UK31L+T is packaged in a 5-pin SOT23 (package code U5+1), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, pin 4 = RESET, and pin 5 = MR2. Its land pattern matches standard SOT23-5 footprints (Maxim land pattern 90-0174), enabling drop-in compatibility with existing layouts.
Does the MAX6448UK31L+T support operation below 1.8V VCC?
Yes-the MAX6448UK31L+T is fully specified down to VCC = 1.0V, with guaranteed RESET assertion integrity and 6µA typical supply current at that level. This enables reliable brownout detection in low-voltage systems where other supervisors may fail to assert reset correctly.
MAX6448UK31L+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:
- 3.075V
- 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
MAX6448UK31L+T FAQ
1.How can I place an order for MAX6448UK31L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6448UK31L+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 MAX6448UK31L+T reliable?
The price and inventory of MAX6448UK31L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6448UK31L+T is usually 5 days.
3.What payment methods are accepted for MAX6448UK31L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6448UK31L+T transactions.
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4.How is shipping managed for MAX6448UK31L+T?
MAX6448UK31L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6448UK31L+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 MAX6448UK31L+T?
For technical support, including MAX6448UK31L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6448UK31L+T requirements.
6.How does Aetrix verify that MAX6448UK31L+T is sourced from the original manufacturer or authorized distributors?
All MAX6448UK31L+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 MAX6448UK31L+T meets industry standards.
7.What is the process for return or replacement of MAX6448UK31L+T?
All MAX6448UK31L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6448UK31L+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 MAX6448UK31L+T part is unused and in its original packaging.
Return procedure for MAX6448UK31L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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