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Analog Devices Inc./Maxim Integrated MAX6450UT29L-T
- Part No.:
- MAX6450UT29L-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6450UT29L-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
The MAX6450UT29L-T from Maxim Integrated is a dual-supply microprocessor supervisory circuit with one fixed-threshold (2.925V) and one adjustable-threshold (0.63V reference) reset monitor, two extended-setup manual reset inputs (MR1/MR2), push-pull active-low RESET output, and 6.72s minimum manual reset pulse width - designed for reliable system initialization in set-top boxes and industrial equipment.
For engineers reviewing the MAX6450UT29L-T datasheet, MAX6450UT29L-T pinout, MAX6450UT29L-T application, or MAX6450UT29L-T equivalent, key selection criteria include its dual-monitor architecture, 2.925V VCC threshold with ±60ppm/°C tempco, 6.72s extended MR setup period, 140ms min reset timeout, and guaranteed operation down to VCC = 1.0V.
Technical Context
The MAX6450UT29L-T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.925V threshold (±1.5% over temperature), while the second monitors RSTIN using an internal 0.63V reference to support externally adjustable thresholds via resistor divider. Both comparators drive a single push-pull RESET output with 210ms typical timeout after supply recovery.
Its dual manual reset inputs (MR1 and MR2) both require 6.72s low assertion (L-suffix) before triggering a one-shot 140ms–280ms RESET pulse; no immediate-reset functionality is present. The device operates across -40°C to +85°C and draws only 6µA at 3.6V, with valid RESET assertion guaranteed down to VCC = 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±1.5% - precisely holds system reset until main supply stabilizes above this level |
| RSTIN Reference Voltage | 0.630V ±0.020V - enables accurate external voltage monitoring down to ~0.63V with high-impedance input |
| Manual Reset Setup Period | 6.72s (L suffix) - prevents nuisance resets from brief front-panel button presses |
| Reset Timeout Period | 140ms (min) / 210ms (typ) - ensures µP completes full reset sequence before release |
| Supply Current | 6µA at 3.6V - minimizes quiescent power in battery-backed or energy-sensitive systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional RESET output even during deep brownout conditions |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor in most µP interface scenarios |
Pinout & Package
MAX6450UT29L-T is housed in a 6-pin SOT23 package (U6-1 outline), with 1.27mm pitch, 2.9mm × 1.6mm footprint, and exposed pad optional per Maxim package drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage |
| 2 | VCC | Main supply input and primary voltage monitor source (2.925V threshold) |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup; requires 6.72s low assertion |
| 4 | RESET | Active-low push-pull output; drives µP reset pin directly without external components |
| 5 | MR2 | Active-low manual reset input with internal 50kΩ pullup; requires simultaneous 6.72s low assertion with MR1 |
| 6 | RSTIN | High-impedance adjustable-threshold input; referenced to 0.63V internal comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset monitoring | Simultaneous supervision of main VCC (2.925V) and auxiliary rail (via RSTIN/resistor divider) |
| Extended manual reset immunity | 6.72s required MR1+MR2 assertion prevents accidental resets from tactile switches |
| Guaranteed reset validity at low VCC | RESET remains functional and correctly asserted down to VCC = 1.0V |
| Precision threshold stability | ±60ppm/°C tempco ensures <0.3% drift over -40°C to +85°C operating range |
| Low-power supervision | 6µA ICC at 3.6V enables use in always-on, battery-critical applications |
Applications
| Set-Top Box Power Sequencing | DVD Player Brownout Recovery |
|---|---|
Use Scenario: Monitors 3.3V main supply and 1.2V core rail during cold start and AC dropout events. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserts RESET until both rails exceed their thresholds and remain stable for 210ms. Use Value: Prevents corrupted firmware execution by ensuring complete power stabilization before µP release. | Use Scenario: Detects transient dips on 5V analog supply and 1.8V digital supply during disc spin-up. IC Role / Device Role / Timing Role: RSTIN monitors 1.8V rail via resistor divider; VCC monitors 5V rail; both trigger coordinated RESET pulse. Use Value: Eliminates video/audio glitches caused by partial power collapse during mechanical load surges. |
| Industrial PLC Controller Reset | Medical Infusion Pump Safety Supervision |
Use Scenario: Validates 24V DC input and isolated 3.3V logic supply before enabling I/O drivers and communication modules. IC Role / Device Role / Timing Role: MR1/MR2 dual-button reset requires simultaneous 6.72s press for maintenance-mode hard reset. Use Value: Prevents unintended controller restart during field servicing or configuration changes. | Use Scenario: Supervises battery-backed 3.3V MCU supply and 5V pump motor driver supply in fail-safe mode. IC Role / Device Role / Timing Role: Fixed 2.925V threshold guards main MCU rail; RSTIN monitors motor supply via 0.63V reference. Use Value: Ensures pump halts and alarms activate within 140ms if either supply falls below safe operating level. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6449UT29L-T | Same pinout, identical 2.925V VCC threshold and 6.72s MR setup, but push-pull RESET instead of open-drain | No external pullup needed; better for direct µP reset pin drive without level-shifting concerns | Select MAX6449UT29L-T when push-pull output simplifies board layout and eliminates pullup resistor |
| TPS3808G33DBVR | Single 3.3V fixed threshold, 200ms reset timeout, 2.5µA ICC, SOT23-5 package - lacks RSTIN and dual MR | Suitable only for single-rail monitoring; no adjustable threshold or dual manual reset capability | Choose TPS3808G33DBVR for cost-sensitive, single-supply applications where dual monitoring is unnecessary |
Compared with MAX6449UT29L-T, the MAX6450UT29L-T adds RSTIN for auxiliary rail supervision; compared with TPS3808G33DBVR, it provides dual-rail monitoring, extended manual reset, and lower ICC at 3.6V - making it optimal for complex embedded systems requiring layered power integrity assurance.
Availability
MAX6450UT29L-T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and industrial PLC controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6450UT29L-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 in industrial, medical, and communications systems.
The MAX6443–MAX6452 family delivers robust µP supervision with extended manual reset immunity and dual-voltage monitoring - engineered specifically for consumer electronics and industrial equipment demanding high noise immunity and predictable reset behavior.
FAQ
What is the exact reset threshold voltage for MAX6450UT29L-T?
The MAX6450UT29L-T has a factory-trimmed VCC reset threshold of 2.925V (±1.5%) and an internal RSTIN reference voltage of 0.630V (±0.020V). These values are specified in the Electrical Characteristics table of the MAX6443–MAX6452 datasheet Rev 4, with tempco of ±60ppm/°C. The "29" suffix explicitly denotes the 2.925V threshold per Table 1.
Does MAX6450UT29L-T support adjustable reset thresholds?
Yes, the MAX6450UT29L-T supports adjustable reset thresholds via its RSTIN pin, which references an internal 0.630V comparator. By connecting an external resistor divider between VCC and GND with RSTIN at the midpoint, users can monitor any voltage ≥0.63V. The formula VMON-TH = 0.63 × (R1 + R2)/R2 defines the monitored threshold, and MAX6450UT29L-T datasheet Figure 5 provides design guidance.
What is the function of the two manual reset inputs on MAX6450UT29L-T?
The MAX6450UT29L-T features MR1 and MR2 - both active-low inputs requiring simultaneous 6.72s low assertion (per L-suffix) to trigger a one-shot RESET pulse. Neither input supports immediate reset; both must be held low together for the full setup period. This dual-input requirement prevents accidental resets and is documented in the Manual Reset Input Options section of the MAX6443–MAX6452 datasheet.
Is MAX6450UT29L-T compatible with 1.8V microcontrollers?
Yes, the MAX6450UT29L-T guarantees valid RESET output down to VCC = 1.0V, and its RSTIN input accepts voltages as low as 0.63V. When interfacing with a 1.8V µP, the push-pull RESET output drives high to ≥0.8 × VCC (≥1.44V) and low to ≤0.3V - meeting standard 1.8V logic thresholds. No level-shifting circuitry is required for direct connection.
What package type and dimensions does MAX6450UT29L-T use?
The MAX6450UT29L-T uses a 6-pin SOT23 package (package code U6-1, outline 21-0058), measuring 2.9mm × 1.6mm with 1.27mm lead pitch. It is available in lead-free form (denoted by "+T" suffix) and conforms to RoHS requirements. Land pattern information is published in Maxim's package documentation under PN 90-0175.
MAX6450UT29L-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.925V, 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
MAX6450UT29L-T FAQ
1.How can I place an order for MAX6450UT29L-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6450UT29L-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 MAX6450UT29L-T reliable?
The price and inventory of MAX6450UT29L-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6450UT29L-T is usually 5 days.
3.What payment methods are accepted for MAX6450UT29L-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6450UT29L-T transactions.
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4.How is shipping managed for MAX6450UT29L-T?
MAX6450UT29L-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6450UT29L-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 MAX6450UT29L-T?
For technical support, including MAX6450UT29L-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6450UT29L-T requirements.
6.How does Aetrix verify that MAX6450UT29L-T is sourced from the original manufacturer or authorized distributors?
All MAX6450UT29L-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 MAX6450UT29L-T meets industry standards.
7.What is the process for return or replacement of MAX6450UT29L-T?
All MAX6450UT29L-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6450UT29L-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 MAX6450UT29L-T part is unused and in its original packaging.
Return procedure for MAX6450UT29L-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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