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Analog Devices Inc./Maxim Integrated MAX6450UT46L+T
- Part No.:
- MAX6450UT46L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6450UT46L+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
MAX6450UT46L+T from Maxim Integrated is a dual-supply microprocessor reset supervisor IC with one fixed-threshold (4.625V) and one adjustable-threshold (0.63V reference) voltage monitor, dual extended-setup manual reset inputs (MR1/MR2), push-pull active-low RESET output, and 6.72s minimum manual reset setup period. It operates from 1.0V to 5.5V supply, draws only 6µA typical current, and guarantees valid reset assertion down to VCC = 1.0V - used in set-top boxes and cable modems for reliable power-on/brownout detection and controlled system reset.
For engineers reviewing the MAX6450UT46L+T datasheet, MAX6450UT46L+T pinout, MAX6450UT46L+T application, or MAX6450UT46L+T equivalent, key selection considerations include its dual-monitor architecture (VCC + RSTIN), 6.72s extended MR1/MR2 setup time to prevent nuisance resets, 4.625V fixed threshold with ±13mV tolerance, 0.63V RSTIN reference for external resistor-divider configuration, and SOT23-6 package compatibility with industrial temperature range (-40°C to +85°C).
Technical Context
The MAX6450UT46L+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 4.625V threshold (±13mV), while the second monitors an external voltage via RSTIN using a precision 0.630V internal reference (±15mV over -40°C to +85°C). Both comparators drive a single push-pull RESET output that asserts low when either monitored voltage falls below its threshold and remains asserted for 210ms (typ) after recovery.
It implements dual manual reset logic: MR1 and MR2 both require ≥6.72s low assertion (tMR, L-suffix) before triggering a 140ms (min) one-shot RESET pulse; neither input has immediate-response capability. Internal 50kΩ pullups on MR1/MR2 eliminate external components, and the device is immune to transients ≤20µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V (factory-trimmed, ±13mV tolerance) - ensures precise brownout detection for 4.5–5.0V systems |
| RSTIN Reference Voltage | 0.630V (±15mV over full temp range) - enables accurate external voltage monitoring down to 0.63V via resistor divider |
| Manual Reset Setup Time | 6.72s (L-suffix) - prevents accidental resets from brief front-panel switch closures |
| Reset Timeout Period | 210ms typical (140ms min) - provides sufficient hold time for µP initialization sequences |
| Supply Current | 6µA typical at 3.6V - supports ultra-low-power battery-backed or always-on applications |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional RESET output even during deep brownout conditions |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and simplifies interface to µP reset pins |
Pinout & Package
MAX6450UT46L+T is housed in a 6-pin SOT23 package (U6+1 outline, 90-0175 land pattern), rated for -40°C to +85°C operation. Pin functions are validated per Maxim's official pin description table and functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and comparator thresholds |
| 2 | VCC | Main supply input and primary voltage monitor source (4.625V threshold) |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup; requires ≥6.72s low assertion to trigger RESET |
| 4 | MR2 | Active-low manual reset input with internal 50kΩ pullup; must be held low simultaneously with MR1 for ≥6.72s to assert RESET |
| 5 | RSTIN | High-impedance adjustable-threshold input referenced to 0.630V; connects to external resistor divider for custom voltage monitoring |
| 6 | RESET | Active-low push-pull output; drives µP reset pin directly without external components |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of main VCC (4.625V) and auxiliary rail (via RSTIN + external divider) prevents undetected partial power failures |
| Extended manual reset setup period | 6.72s dual-input requirement eliminates false resets from momentary button presses in consumer front panels |
| Guaranteed RESET validity down to VCC = 1.0V | Ensures deterministic µP reset state during deep brownout, avoiding undefined behavior or latch-up in downstream logic |
| Low 6µA quiescent current | Enables integration into battery-powered or energy-harvesting systems where standby power budget is sub-10µA |
| Push-pull RESET output | Eliminates external pullup resistor, reduces BOM count, and improves noise immunity vs. open-drain alternatives |
Applications
| Set-Top Box Power Sequencing | Cable Modem Brownout Recovery |
|---|---|
Use Scenario: Monitors 3.3V and 1.2V rails in hybrid digital/analog STB platforms during cold start and line-voltage sags. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET until both supplies stabilize above 3.3V and 1.2V thresholds, with 210ms timeout ensuring complete SoC boot readiness. Use Value: Prevents firmware corruption by blocking µP execution until all critical rails meet timing and voltage margins. | Use Scenario: Detects transient drops on 5V DC input in outdoor-installed cable modems exposed to lightning-induced surges. IC Role / Device Role / Timing Role: VCC monitor triggers RESET on 5V sag below 4.625V; RSTIN monitors PoE-derived 3.3V rail via divider to catch secondary supply failure. Use Value: Enables autonomous recovery without technician intervention by combining fast transient immunity (20µs/100mV) with dual-rail fault coverage. |
| Industrial HMI Panel Reset Control | DVD Player Front-Panel Safety Reset |
Use Scenario: Integrates with touch-button interface on factory-floor HMIs where accidental reset must be prevented but service-mode reset required. IC Role / Device Role / Timing Role: MR1/MR2 configured as dual-button safety interlock; both front-panel switches must be pressed ≥6.72s to assert RESET, preventing unintended reboots. Use Value: Meets IEC 61000-4-2 ESD and IEC 61000-4-4 EFT immunity requirements by rejecting sub-6.72s glitches from noisy industrial environments. | Use Scenario: Provides user-initiated hard reset in consumer DVD players using existing channel-select and power buttons. IC Role / Device Role / Timing Role: MR1 connected to power button, MR2 to channel-up button; simultaneous 6.72s press initiates full system reset while short presses retain normal function. Use Value: Eliminates need for dedicated reset button, reducing mechanical cost and improving UI consistency without compromising reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6449UT46L+T | Identical pinout, package, and electrical specs except open-drain RESET output (vs. push-pull in MAX6450UT46L+T) | Requires external pullup resistor; suitable when level-shifting to non-VCC logic domains is needed | Select MAX6449UT46L+T only if open-drain flexibility (e.g., wired-OR with other reset sources) outweighs added component count |
| TPS3808G33DBVR | Single 3.3V fixed threshold, no RSTIN input, 200ms timeout, 1.6µA ICC - lacks dual-monitoring and adjustable threshold capability | Applicable only for single-rail 3.3V systems; cannot replace MAX6450UT46L+T in dual-supply or custom-threshold designs | Choose TPS3808G33DBVR only for cost-sensitive, single-threshold applications where RSTIN functionality is unused |
Compared with MAX6449UT46L+T, MAX6450UT46L+T offers simplified layout via push-pull RESET but sacrifices level-shifting flexibility; versus TPS3808G33DBVR, it delivers essential dual-supply monitoring and field-programmable thresholding at higher quiescent current and cost - making it irreplaceable in multi-rail consumer electronics requiring robust, user-controlled reset.
Availability
MAX6450UT46L+T is available at Aetrix Electronics and suitable for set-top boxes, cable modems, industrial HMIs, and DVD players requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6450UT46L+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, sensing, and interface applications, with emphasis on high-reliability industrial and consumer solutions.
The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in noise-prone consumer electronics, featuring extended manual reset timing, dual voltage monitoring, and ultra-low power consumption.
FAQ
What is the exact reset threshold voltage for VCC on the MAX6450UT46L+T?
The MAX6450UT46L+T has a factory-trimmed VCC reset threshold of 4.625V, with a guaranteed tolerance of ±13mV (4.612V to 4.638V) over the full -40°C to +85°C operating range. This value is defined by the "46" suffix in the part number and is confirmed in the Electrical Characteristics table under VTH parameter for the 46 threshold code.
Does the MAX6450UT46L+T support monitoring a second voltage rail besides VCC?
Yes, the MAX6450UT46L+T supports monitoring a second voltage rail via its RSTIN pin, which references an internal 0.630V precision comparator. By connecting RSTIN to the center node of an external resistor divider, users can configure custom reset thresholds down to 0.63V - enabling supervision of auxiliary rails like 1.2V, 1.8V, or 2.5V in multi-rail systems.
What is the purpose of the dual manual reset inputs (MR1 and MR2) on the MAX6450UT46L+T?
The dual manual reset inputs MR1 and MR2 on the MAX6450UT46L+T require simultaneous assertion for ≥6.72 seconds (L-suffix) to trigger a one-shot RESET pulse. This design prevents accidental resets from brief button presses and enforces intentional user action - commonly used in consumer devices where two front-panel buttons must be pressed together for service-mode reset.
Can the MAX6450UT46L+T operate reliably when VCC drops below 1.0V?
No - the MAX6450UT46L+T guarantees valid RESET output only down to VCC = 1.0V. Below this voltage, its internal circuitry cannot maintain specified sink current or logic state integrity. For applications requiring RESET assertion down to 0V, a pulldown resistor (e.g., 100kΩ) must be added externally to the push-pull RESET output, as detailed in the "Ensuring a Valid RESET Down to VCC = 0V" section of the datasheet.
What package type and footprint does the MAX6450UT46L+T use?
The MAX6450UT46L+T uses a 6-pin SOT23 package (package code U6+1, outline 21-0058, land pattern 90-0175), with pin 1 (GND) at bottom-left when viewed from top with marking dot in upper-left corner. This compact footprint supports high-density PCB layouts and is compatible with standard SOT23 reflow profiles including lead-free soldering at +260°C.
MAX6450UT46L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- 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-6
MAX6450UT46L+T FAQ
1.How can I place an order for MAX6450UT46L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6450UT46L+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 MAX6450UT46L+T reliable?
The price and inventory of MAX6450UT46L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6450UT46L+T is usually 5 days.
3.What payment methods are accepted for MAX6450UT46L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6450UT46L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6450UT46L+T?
MAX6450UT46L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6450UT46L+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 MAX6450UT46L+T?
For technical support, including MAX6450UT46L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6450UT46L+T requirements.
6.How does Aetrix verify that MAX6450UT46L+T is sourced from the original manufacturer or authorized distributors?
All MAX6450UT46L+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 MAX6450UT46L+T meets industry standards.
7.What is the process for return or replacement of MAX6450UT46L+T?
All MAX6450UT46L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6450UT46L+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 MAX6450UT46L+T part is unused and in its original packaging.
Return procedure for MAX6450UT46L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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