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Analog Devices Inc./Maxim Integrated MAX6451UT29L+T
- Part No.:
- MAX6451UT29L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6451UT29L+T.pdf
- Description:
- IC MPU RESET 2.925V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,172
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Product details
Overview
MAX6451UT29L+T from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (2.925V) and one adjustable-threshold reset monitor, featuring one extended-setup manual reset input (MR1, tMR = 6.72s) and one immediate-assertion manual reset input (MR2). It delivers active-low push-pull RESET output with 140ms min timeout, 6µA supply current, and guaranteed operation down to VCC = 1.0V - used in smart-card-detect and interrupt-before-reset systems in set-top boxes and industrial equipment.
For engineers reviewing the MAX6451UT29L+T datasheet, MAX6451UT29L+T pinout, MAX6451UT29L+T application, or MAX6451UT29L+T equivalent, key selection concerns include fixed/adjustable voltage monitoring capability, dual-mode manual reset timing (extended vs. immediate), push-pull RESET drive strength at low VCC, SOT23-6 package compatibility, and immunity to <20µs transients below threshold.
Technical Context
The MAX6451UT29L+T integrates two independent reset comparators: one factory-set at 2.925V for VCC monitoring and one high-impedance RSTIN input with 0.63V reference enabling external resistor-divider configuration for voltages as low as 0.63V. Its MR1 input requires 6.72s low assertion before generating a 140ms–280ms RESET pulse, while MR2 triggers an immediate one-shot RESET on rising edge with 210ms debounce on deassertion.
This architecture supports hierarchical system control: MR1 serves as secure long-press hardware reset (e.g., service mode), MR2 enables fast card-insertion detection, and RSTIN allows precise monitoring of auxiliary rails like 1.2V core supplies. The push-pull RESET output drives µP reset pins directly without external pullup, maintaining valid logic down to VCC = 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±0.075V - precisely monitors +3.3V rail brownout with 2.5mV hysteresis |
| RSTIN Threshold | 0.630V ±0.015V - sets adjustable reset point for external divider; enables monitoring of 1.2V, 1.5V, or 1.8V supplies |
| Manual Reset Setup (MR1) | 6.72s typical - prevents nuisance resets from front-panel switches; requires sustained press for system recovery |
| MR2 Response | Immediate rising-edge triggered - asserts RESET within 200ns; debounced 210ms on release to prevent false card-removal resets |
| RESET Timeout | 140ms min / 210ms typ - ensures µP completes power-up initialization before releasing reset |
| Supply Current | 6µA at 3.6V - enables always-on supervision in battery-backed systems without significant drain |
| Operating Range | -40°C to +85°C - qualified for industrial and automotive cabin environments |
Pinout & Package
MAX6451UT29L+T is housed in a 6-pin SOT23 package (U6+1 outline, 90-0175 land pattern), with 1.27mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not connected. Pin 1 is GND, Pin 2 is VCC, Pin 3 is MR1, Pin 4 is RESET, Pin 5 is MR2, and Pin 6 is RSTIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for all internal comparators and output driver; must be low-impedance connection to system ground plane |
| VCC (Pin 2) | Main supply and primary monitor input | Powers IC and provides reference for fixed 2.925V reset threshold; accepts 1.0V–5.5V |
| MR1 (Pin 3) | Extended manual reset input | Active-low input with internal 50kΩ pullup; requires ≥6.72s low assertion to trigger one-shot RESET |
| RESET (Pin 4) | Active-low push-pull reset output | Drives µP reset pin directly; sinks 1.2mA at VCC ≥ 2.55V; valid logic state guaranteed down to VCC = 1.0V |
| MR2 (Pin 5) | Immediate manual reset input | Active-high input; rising edge triggers immediate RESET pulse; internally debounced 210ms on falling edge |
| RSTIN (Pin 6) | Adjustable threshold monitor input | High-Z input referenced to 0.63V; connects to center tap of external resistor divider to set custom reset voltage |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset | MR1 enables secure long-press reset (6.72s); MR2 enables instant card-detect response - eliminates need for separate reset and interrupt ICs |
| Fixed + adjustable voltage monitoring | Simultaneously supervises main +3.3V rail (2.925V) and secondary core rail (e.g., 1.2V via RSTIN) - reduces BOM count in multi-rail systems |
| Push-pull RESET with low-VCC validity | Guaranteed output state down to VCC = 1.0V - ensures deterministic reset behavior during deep brownout conditions |
| Transient immunity | Immune to 20µs transients ≤100mV below threshold - prevents spurious resets from ESD or switching noise |
| Ultra-low quiescent current | 6µA at 3.6V - extends battery life in always-on supervisory applications such as smart meters and IoT edge nodes |
Applications
| Smart Card Detection | Interrupt-Before-Reset |
|---|---|
Use Scenario: Detecting insertion/removal of SIM or secure element cards in set-top boxes or payment terminals. IC Role / Device Role / Timing Role: MR2 monitors card-detect switch; rising edge triggers immediate 140ms RESET pulse to initialize card interface logic. Use Value: Eliminates need for external debounce circuitry; 210ms MR2 deassertion debounce prevents false removal resets during mechanical contact bounce. | Use Scenario: Allowing user to first interrupt firmware (e.g., enter diagnostics) before triggering full hard reset if unresponsive. IC Role / Device Role / Timing Role: Same front-panel pushbutton drives both µP NMI and MR1; short press (<6.72s) asserts interrupt only, long press asserts RESET. Use Value: Reduces mechanical parts count and PCB space; leverages extended setup period to differentiate user intent without additional logic. |
| Industrial Power Sequencing | DVD/Blu-ray Player Supervision |
Use Scenario: Ensuring proper startup order of FPGA, DSP, and analog subsystems in programmable logic controllers. IC Role / Device Role / Timing Role: RSTIN monitors 1.2V FPGA core rail; VCC monitors 3.3V I/O rail; RESET holds all devices in reset until both exceed thresholds and timeout expires. Use Value: Prevents metastability and latch-up by enforcing strict voltage sequencing; 210ms typ timeout accommodates slow-ramping supplies. | Use Scenario: Reliable reset coordination across DVD servo controller, video decoder, and USB host in consumer disc players. IC Role / Device Role / Timing Role: Fixed 2.925V threshold supervises +3.3V supply; push-pull RESET drives multiple reset inputs simultaneously with clean edges. Use Value: 6µA supply current minimizes standby power; -40°C to +85°C rating ensures operation in enclosed, thermally stressed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6452UT29L+T | Same pinout and electrical specs, but open-drain RESET output instead of push-pull | Requires external pullup resistor; better suited for level-shifting or wired-OR reset buses | Select MAX6452UT29L+T when interfacing to mixed-voltage systems or sharing RESET bus with other open-drain sources |
| TPS3808G33DBVR | Single fixed 3.3V threshold, no RSTIN or dual MR inputs; 200ms timeout; 1.5µA ICC | Lacks adjustable monitoring and dual-mode reset; optimized for simple single-rail applications | Choose TPS3808G33DBVR for cost-sensitive, single-supply designs where extended/manual reset flexibility is unnecessary |
Compared with MAX6452UT29L+T, the MAX6451UT29L+T offers direct-drive push-pull RESET eliminating external components, while TPS3808G33DBVR trades feature depth for ultra-low current and lower unit cost in basic supervision roles.
Availability
MAX6451UT29L+T is available at Aetrix Electronics and suitable for set-top box manufacturing, industrial PLC design, smart-card terminal development, and DVD player production requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6451UT29L+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, mixed-signal, and power management ICs for industrial, computing, communications, and consumer applications.
The MAX6443–MAX6452 family was engineered to solve nuisance reset issues in front-panel-controlled electronics, combining extended manual reset timing, dual-supply monitoring, and robust transient immunity in miniature SOT packages.
FAQ
What is the exact reset threshold voltage for MAX6451UT29L+T?
The MAX6451UT29L+T has a factory-trimmed VCC reset threshold of 2.925V, with ±0.075V tolerance over temperature. This value is specified in Table 1 of the datasheet under suffix "29" and applies to the primary supply monitor. The RSTIN input uses a separate 0.630V internal reference for adjustable threshold configuration.
Does MAX6451UT29L+T support monitoring a 1.2V supply?
Yes, MAX6451UT29L+T supports monitoring a 1.2V supply using its RSTIN pin. With the internal 0.630V reference, a resistor divider (e.g., R1 = 225kΩ, R2 = 250kΩ) sets the trip point at 1.2V. The high-impedance RSTIN input draws only ±25nA, minimizing divider current and power loss.
What is the function of MR2 on MAX6451UT29L+T?
MR2 on MAX6451UT29L+T is an immediate-assertion manual reset input. A rising edge on MR2 triggers a one-shot RESET pulse within 200ns. Its falling edge is debounced for 210ms to prevent false resets during mechanical switch release - ideal for smart-card detect or test-mode entry.
Can MAX6451UT29L+T operate with VCC below 1.0V?
No, MAX6451UT29L+T is not guaranteed to operate below VCC = 1.0V. Its RESET output is specified to maintain valid logic states only down to 1.0V. For applications requiring reset assertion at 0V, an external pulldown resistor (e.g., 100kΩ) must be added to the push-pull RESET output.
What package type does MAX6451UT29L+T use?
MAX6451UT29L+T uses a 6-pin SOT23 package (package code U6+1, outline 21-0058). It measures 2.9mm × 1.6mm with 1.27mm lead pitch and is RoHS-compliant (indicated by "+T" suffix). The pin 1 indicator is a dot, and the package has no thermal pad.
MAX6451UT29L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.925V, 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
MAX6451UT29L+T FAQ
1.How can I place an order for MAX6451UT29L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6451UT29L+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 MAX6451UT29L+T reliable?
The price and inventory of MAX6451UT29L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6451UT29L+T is usually 5 days.
3.What payment methods are accepted for MAX6451UT29L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6451UT29L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6451UT29L+T?
MAX6451UT29L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6451UT29L+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 MAX6451UT29L+T?
For technical support, including MAX6451UT29L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6451UT29L+T requirements.
6.How does Aetrix verify that MAX6451UT29L+T is sourced from the original manufacturer or authorized distributors?
All MAX6451UT29L+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 MAX6451UT29L+T meets industry standards.
7.What is the process for return or replacement of MAX6451UT29L+T?
All MAX6451UT29L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6451UT29L+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 MAX6451UT29L+T part is unused and in its original packaging.
Return procedure for MAX6451UT29L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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