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Analog Devices Inc./Maxim Integrated MAX6450UT26L-T
- Part No.:
- MAX6450UT26L-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6450UT26L-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,348
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Product details
Overview
The MAX6450UT26L-T from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (2.625V) and one adjustable-threshold (0.63V reference) voltage monitor, two extended-setup manual reset inputs (MR1/MR2), active-low open-drain RESET output, 6.72s manual reset setup period, and guaranteed operation down to VCC = 1.0V - used in consumer electronics and industrial equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6450UT26L-T datasheet, MAX6450UT26L-T pinout, MAX6450UT26L-T application, or MAX6450UT26L-T equivalent, key selection considerations include its dual-monitor architecture (fixed + adjustable), SOT23-6 package, 6.72s extended MR setup time, 140ms min reset timeout, and immunity to short transients - critical for front-panel pushbutton-driven systems requiring nuisance-reset suppression.
Technical Context
The MAX6450UT26L-T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.625V threshold (±1.5% over -40°C to +85°C), while the second monitors an external voltage via RSTIN using a precise 0.630V internal reference (±0.015V over temperature). Both comparators drive a shared open-drain RESET output with 140ms minimum timeout.
Its dual manual reset architecture requires simultaneous assertion of MR1 and MR2 for ≥6.72s to trigger a one-shot RESET pulse; this long setup period rejects switch bounce and accidental presses. The device operates from 1.0V to 5.5V supply and draws only 6µA typical at 3.6V, enabling battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±1.5% - factory-trimmed precision threshold for primary supply monitoring |
| RSTIN Reference Voltage | 0.630V ±0.015V - stable internal reference enabling adjustable monitoring down to 0.63V |
| Manual Reset Setup Time | 6.72s - extended MR1+MR2 hold time prevents false resets from brief button presses |
| Reset Timeout Period | 140ms min - ensures µP reset signal meets minimum assertion duration requirements |
| Supply Current | 6µA typ at 3.6V - ultra-low quiescent current extends battery life in portable devices |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET logic even during deep brownout conditions |
| Output Type | Active-low open-drain - enables level-shifting and wired-OR reset bus configurations |
Pinout & Package
MAX6450UT26L-T is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), RoHS-compliant, lead-free compatible (ordered as +T), and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and comparator inputs |
| 2 | VCC | Main power supply input and monitored voltage source for fixed-threshold reset |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup - must be held low ≥6.72s with MR2 |
| 4 | MR2 | Active-low manual reset input with internal 50kΩ pullup - co-asserted with MR1 for reset initiation |
| 5 | RSTIN | High-impedance adjustable-threshold input - connects to external resistor divider for custom voltage monitoring |
| 6 | RESET | Active-low open-drain output - requires external pullup; sinks 3.2mA at VCC ≥4.25V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitors | Simultaneous fixed (2.625V) and adjustable (0.63V ref) supervision enables multi-rail system reset coordination |
| Extended manual reset setup | 6.72s dual-input hold time eliminates nuisance resets from mechanical switch bounce or user error |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = 1.0V ensures robust behavior during deep brownout recovery |
| Transient immunity | Rejects VCC glitches ≤20µs wide when falling 100mV below threshold - improves noise resilience |
| Low-power operation | 6µA typical ICC at 3.6V supports always-on supervision in energy-constrained designs |
Applications
| Set-Top Boxes | DVD Players |
|---|---|
Use Scenario: Front-panel power/reset button interface with anti-bounce protection. IC Role / Device Role / Timing Role: Dual manual reset inputs (MR1+MR2) require simultaneous 6.72s press to assert RESET, preventing accidental channel-change-triggered resets. Use Value: Eliminates false resets during normal remote control usage while enabling deliberate hard reset via coordinated button press. | Use Scenario: Multi-rail power sequencing and brownout detection during disc spin-up. IC Role / Device Role / Timing Role: Monitors both 3.3V logic rail (via VCC) and 1.2V core rail (via RSTIN + resistor divider) with independent thresholds. Use Value: Ensures processor reset occurs only when both rails are stable, preventing corrupted firmware execution during marginal power conditions. |
| Cable/DSL Modems | Industrial Equipment |
Use Scenario: Remote firmware update recovery with hardware-assisted reset confirmation. IC Role / Device Role / Timing Role: Open-drain RESET output drives an LED indicator that blinks for 140ms during manual reset assertion. Use Value: Provides visual feedback confirming successful reset initiation, improving field service diagnostics and user confidence. | Use Scenario: Reliable power-on initialization in harsh environments with voltage transients. IC Role / Device Role / Timing Role: Immunity to ≤20µs VCC transients ensures no spurious resets during EMI events or relay switching noise. Use Value: Maintains system uptime in electrically noisy factory settings without requiring additional filtering components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6449UT26L-T | Same dual-monitor architecture and 2.625V VCC threshold, but uses push-pull RESET instead of open-drain | Requires no external pullup resistor; unsuitable for wired-OR reset buses or level-shifting | Select MAX6449UT26L-T when driving a single µP reset pin directly without bus sharing |
| TPS3808G33DBVR | Single fixed 3.3V threshold, 200ms reset timeout, 2.5µA ICC, SOT23-5 package - lacks adjustable RSTIN and dual MR inputs | Only monitors one rail; no extended manual reset capability - simpler but less flexible | Choose TPS3808G33DBVR for cost-sensitive single-rail applications where dual monitoring and long MR setup are unnecessary |
Compared with MAX6449UT26L-T, the MAX6450UT26L-T provides open-drain flexibility for bus architectures; versus TPS3808G33DBVR, it adds adjustable monitoring and dual extended MR inputs - making it uniquely suited for complex, multi-button, multi-rail embedded systems requiring high noise immunity.
Availability
MAX6450UT26L-T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and industrial equipment requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6450UT26L-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) is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX6443–MAX6452 family was designed specifically for robust microprocessor supervision in consumer and industrial systems where immunity to switch bounce, voltage transients, and brownout conditions is essential.
FAQ
What is the exact reset threshold voltage for the VCC monitor in MAX6450UT26L-T?
The MAX6450UT26L-T has a factory-trimmed VCC reset threshold of 2.625V, with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is defined by the "26" suffix per Table 1 in the datasheet and is laser-trimmed during production for high accuracy without external calibration.
Does MAX6450UT26L-T support monitoring a 1.8V supply rail?
Yes, the MAX6450UT26L-T can monitor a 1.8V rail using its RSTIN pin. With the internal 0.630V reference, a resistor divider (e.g., R1 = 457kΩ, R2 = 250kΩ) sets the trip point to 1.8V. The RSTIN input draws only ±25nA, minimizing divider current and power loss.
What is the function of the MR2 pin on MAX6450UT26L-T?
On the MAX6450UT26L-T, MR2 is an active-low manual reset input that must be asserted simultaneously with MR1 for ≥6.72 seconds to trigger the RESET pulse. Unlike immediate-reset variants, MR2 has no standalone function - it works exclusively in conjunction with MR1 to provide dual-button reset security.
Can MAX6450UT26L-T operate with a 1.2V supply?
No, the MAX6450UT26L-T requires a minimum VCC of 1.0V to guarantee valid RESET output logic, but its VCC reset threshold is fixed at 2.625V. Supplying only 1.2V would prevent the internal circuitry from reaching the 2.625V threshold, so it cannot supervise a 1.2V rail directly via VCC - use RSTIN with a divider instead.
Is MAX6450UT26L-T pin-compatible with MAX6449UT26L-T?
Yes, MAX6450UT26L-T and MAX6449UT26L-T share identical 6-pin SOT23 pinouts (GND, VCC, MR1, MR2, RSTIN, RESET) and identical electrical connections. The only functional difference is RESET output type: MAX6450UT26L-T uses open-drain, while MAX6449UT26L-T uses push-pull - requiring different external pullup handling.
MAX6450UT26L-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:
- 2.625V, 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
MAX6450UT26L-T FAQ
1.How can I place an order for MAX6450UT26L-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6450UT26L-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 MAX6450UT26L-T reliable?
The price and inventory of MAX6450UT26L-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6450UT26L-T is usually 5 days.
3.What payment methods are accepted for MAX6450UT26L-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6450UT26L-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6450UT26L-T?
MAX6450UT26L-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6450UT26L-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 MAX6450UT26L-T?
For technical support, including MAX6450UT26L-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6450UT26L-T requirements.
6.How does Aetrix verify that MAX6450UT26L-T is sourced from the original manufacturer or authorized distributors?
All MAX6450UT26L-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 MAX6450UT26L-T meets industry standards.
7.What is the process for return or replacement of MAX6450UT26L-T?
All MAX6450UT26L-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6450UT26L-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 MAX6450UT26L-T part is unused and in its original packaging.
Return procedure for MAX6450UT26L-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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