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Analog Devices Inc./Maxim Integrated MAX6451UT46L+T
- Part No.:
- MAX6451UT46L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6451UT46L+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6451UT46L+T from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (4.625V) and one adjustable-threshold (0.63V reference) voltage monitor, extended manual reset setup period (6.72s), push-pull active-low RESET output, and operation over –40°C to +85°C. It prevents nuisance resets in set-top boxes and industrial equipment by rejecting short switch closures and transient glitches.
For engineers reviewing the MAX6451UT46L+T datasheet, MAX6451UT46L+T pinout, MAX6451UT46L+T application, or MAX6451UT46L+T equivalent, key selection considerations include its dual manual reset architecture (MR1 extended + MR2 immediate), guaranteed RESET validity down to VCC = 1.0V, 6µA supply current, and SOT23-6 package compatibility with high-reliability embedded power sequencing.
Technical Context
The MAX6451UT46L+T integrates two independent reset comparators: one monitors VCC against a factory-set 4.625V threshold (±130mV tolerance), while the second monitors an external voltage via RSTIN using a precision 0.630V internal reference with 2.5mV hysteresis. Its dual manual reset inputs implement distinct timing behaviors - MR1 requires a 6.72s low assertion for reset generation, whereas MR2 triggers an immediate one-shot RESET pulse on rising edge.
This architecture enables coordinated system-level control: MR1 serves as a deliberate hard-reset input (e.g., front-panel service button), while MR2 supports event-driven actions like smart-card insertion detection. The device guarantees valid push-pull RESET output down to VCC = 1.0V and maintains immunity to transients ≤20µs when VCC drops 100mV below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V (factory-trimmed, ±130mV max deviation); ensures reliable brownout detection for 4.5–5.0V logic rails. |
| RSTIN Reference Voltage | 0.630V (±20mV, –40°C to +85°C); enables precise monitoring of sub-1V supplies via external resistor divider. |
| MR1 Setup Period | 6.72s (L-suffix); eliminates false resets from accidental or brief front-panel switch actuation. |
| RESET Timeout Period | 140ms minimum; provides sufficient hold time for microprocessor initialization sequences. |
| Supply Current | 6µA at 3.6V; enables battery-backed or ultra-low-power always-on supervision without significant drain. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and automotive cabin environments without derating. |
| VCC Range | 1.0V to 5.5V; ensures functional RESET assertion even during deep brownout conditions. |
Pinout & Package
MAX6451UT46L+T is housed in a RoHS-compliant 6-pin SOT23 package (U6+1 outline, 90-0175 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output driver; must be low-impedance connection to system ground plane. |
| 2 | VCC | Main power supply input (1.0V–5.5V); powers internal circuitry and serves as primary monitored voltage source. |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup; requires ≥6.72s low assertion to trigger one-shot RESET pulse. |
| 4 | MR2 | Active-high manual reset input; rising edge immediately initiates 140ms RESET pulse; debounced for 210ms on falling edge. |
| 5 | RSTIN | High-impedance adjustable-threshold input; connects to external resistor divider to monitor secondary supply (e.g., core voltage). |
| 6 | RESET | Active-low push-pull output; drives microprocessor reset pin directly without external pullup; sinks 1.2mA at VCC ≥ 2.55V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual manual reset architecture | MR1 (6.72s extended setup) + MR2 (immediate edge-triggered) enables both deliberate system reset and responsive event signaling (e.g., card detect). |
| Adjustable secondary voltage monitor | RSTIN input with 0.630V reference allows precise supervision of any supply ≥0.63V using only two external resistors, minimizing BOM count. |
| Nuisance-reset immunity | Guaranteed rejection of MR1 transitions <6.72s and VCC transients ≤20µs (at 100mV overdrive), eliminating false resets in noisy environments. |
| Low-voltage reset assurance | Valid RESET output guaranteed down to VCC = 1.0V, ensuring deterministic processor behavior during deep brownout recovery. |
| Ultra-low quiescent current | 6µA typical supply current at 3.6V enables multi-year operation on coin-cell batteries in maintenance-free applications. |
Applications
| Set-Top Box Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Coordinating startup of main SoC, tuner, and HDMI controller after AC power restoration. IC Role / Device Role / Timing Role: MAX6451UT46L+T monitors 5V rail (VCC) and 1.2V core supply (via RSTIN), asserting RESET until both stabilize above thresholds, then holding for 140ms. Use Value: Prevents firmware corruption by ensuring all voltage domains are stable before processor release, eliminating boot failures caused by marginal rail sequencing. |
Use Scenario: Ensuring deterministic restart after field wiring fault or ESD-induced latch-up in programmable logic controllers. IC Role / Device Role / Timing Role: MAX6451UT46L+T uses MR1 (6.72s front-panel button) for controlled maintenance reset and MR2 (rising edge) for automatic watchdog-triggered recovery. Use Value: Eliminates need for separate hardware watchdog and manual reset circuits, reducing component count while maintaining safety-critical reset integrity. |
| Smart-Card Reader Interface | Medical Infusion Pump Safety Monitoring |
Use Scenario: Detecting card insertion/removal and initiating secure session initialization or termination. IC Role / Device Role / Timing Role: MAX6451UT46L+T configures MR2 as card-detect input (rising edge = insert), generating 140ms RESET pulse to initialize secure crypto engine; MR1 remains available for emergency hard reset. Use Value: Provides glitch-immune, debounced card presence signal without external RC filters or firmware polling, accelerating secure session setup. |
Use Scenario: Guaranteeing fail-safe shutdown and restart of motor control MCU during battery voltage sag or sensor supply dropout. IC Role / Device Role / Timing Role: MAX6451UT46L+T monitors main 3.3V logic rail (VCC) and isolated 2.5V analog sensor supply (RSTIN), asserting RESET if either falls below threshold for >140ms. Use Value: Meets IEC 62304 Class C requirements by providing hardware-enforced reset independent of software, preventing unsafe actuator motion during power anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6452UT46L+T | Same VCC threshold (4.625V) and MR1 setup (6.72s), but open-drain RESET output instead of push-pull. | Requires external pullup resistor; suited for level-shifting or wired-OR reset bus configurations. | Select MAX6452UT46L+T only when interfacing to mixed-voltage systems or sharing RESET line with other open-drain sources. |
| MAX6448UK46L+T | Single-supply supervisor (VCC only), 4.625V threshold, 5-pin SOT23, no RSTIN or MR2; MR1-only with same 6.72s setup. | Lacks adjustable secondary monitoring and immediate-reset capability; simpler BOM for single-rail applications. | Choose MAX6448UK46L+T when supervising only main supply and no secondary voltage or event-triggered reset is needed. |
Compared with MAX6451UT46L+T, MAX6452UT46L+T trades push-pull drive strength for interface flexibility, while MAX6448UK46L+T reduces feature set and pin count for cost-sensitive single-monitor use cases-neither is pin-compatible, requiring PCB layout changes.
Availability
MAX6451UT46L+T is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, set-top boxes, and smart-card readers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6451UT46L+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, medical, and communications applications, emphasizing reliability, low power, and integration.
The MAX6443–MAX6452 family was engineered to solve nuisance-reset problems in consumer and industrial electronics by combining extended manual reset timing, dual-supply monitoring, and ultra-low quiescent current in miniature packages.
FAQ
What is the exact VCC reset threshold voltage for MAX6451UT46L+T?
The MAX6451UT46L+T has a factory-trimmed VCC reset threshold of 4.625V, with a maximum deviation of ±130mV over the full –40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet under suffix "46", and applies specifically to the MAX6451UT46L+T-not to other variants in the MAX6443–MAX6452 family.
Does MAX6451UT46L+T support monitoring a secondary voltage lower than 1.0V?
Yes, MAX6451UT46L+T supports monitoring voltages as low as 0.63V via its RSTIN pin, using an internal precision 0.630V reference. By connecting RSTIN to a resistor divider from the target supply, users can set custom thresholds down to 0.63V; the datasheet provides explicit formulas and examples for calculating R1/R2 values.
How does the MR2 input on MAX6451UT46L+T differ from MR1?
MR1 on MAX6451UT46L+T is an active-low input requiring a sustained 6.72s low assertion to trigger RESET, while MR2 is an active-high input that asserts RESET on a rising edge-enabling immediate response to events like smart-card insertion. MR2 also features 210ms debouncing on the falling edge to prevent false deassertion during removal.
Is MAX6451UT46L+T compatible with 1.8V logic systems?
Yes, MAX6451UT46L+T operates with VCC as low as 1.0V and guarantees valid RESET output down to that level. Its MR1/MR2 input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), making it fully compatible with 1.8V systems when powered from a 1.8V supply, provided the monitored VCC rail matches the intended reset threshold.
What package type and dimensions does MAX6451UT46L+T use?
MAX6451UT46L+T uses a 6-pin SOT23 package (package code U6+1, outline 21-0058), measuring 2.9mm × 1.6mm × 1.1mm with standard 0.95mm pin pitch. The land pattern is documented as 90-0175 on Maxim's packaging website, and the device is supplied in tape-and-reel format with 2500-piece minimum order quantity.
MAX6451UT46L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- 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-6
MAX6451UT46L+T FAQ
1.How can I place an order for MAX6451UT46L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6451UT46L+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 MAX6451UT46L+T reliable?
The price and inventory of MAX6451UT46L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6451UT46L+T is usually 5 days.
3.What payment methods are accepted for MAX6451UT46L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6451UT46L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6451UT46L+T?
MAX6451UT46L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6451UT46L+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 MAX6451UT46L+T?
For technical support, including MAX6451UT46L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6451UT46L+T requirements.
6.How does Aetrix verify that MAX6451UT46L+T is sourced from the original manufacturer or authorized distributors?
All MAX6451UT46L+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 MAX6451UT46L+T meets industry standards.
7.What is the process for return or replacement of MAX6451UT46L+T?
All MAX6451UT46L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6451UT46L+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 MAX6451UT46L+T part is unused and in its original packaging.
Return procedure for MAX6451UT46L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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