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Analog Devices Inc./Maxim Integrated MAX6450UT29L
- Part No.:
- MAX6450UT29L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6450UT29L.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
MAX6450UT29L from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (2.925V) 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 minimum manual reset pulse width, and guaranteed operation down to VCC = 1.0V. It targets power sequencing and reliable system reset in consumer set-top boxes and DVD players.
For engineers reviewing the MAX6450UT29L datasheet, MAX6450UT29L pinout, MAX6450UT29L application, or MAX6450UT29L equivalent, key selection criteria include its dual-monitor architecture, 6.72s extended manual reset setup period, 2.925V fixed VCC threshold, RSTIN-adjustable monitoring capability, and SOT23-6 open-drain output compatibility with mixed-voltage logic interfaces.
Technical Context
The MAX6450UT29L integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.925V threshold (±1.5% over -40°C to +85°C), while the second monitors an external voltage via RSTIN using a precision 0.630V internal reference (±0.015V). Both comparators drive a shared open-drain RESET output with 140ms minimum timeout.
Its dual manual reset architecture requires MR1 and MR2 to be held low simultaneously for ≥6.72s to trigger a one-shot reset pulse; this long setup period eliminates nuisance resets from front-panel switches. The device operates from 1.0V to 5.5V supply and draws only 6µA typical current at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±1.5% - precisely monitors 3.3V rail brownout without external components |
| RSTIN Reference Voltage | 0.630V ±0.015V - enables accurate adjustment of monitored voltage thresholds down to 0.63V |
| Manual Reset Setup Period | 6.72s (L-suffix) - prevents accidental reset from brief button presses in consumer UIs |
| Reset Timeout Period | 140ms min - ensures sufficient processor hold time for reliable cold boot or recovery |
| Supply Current | 6µA typ at 3.6V - supports always-on monitoring in battery-backed or low-power systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout conditions |
| RESET Output Type | Open-drain - allows level-shifting to 0–6V logic domains and wired-OR configuration |
Pinout & Package
MAX6450UT29L is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), optimized for space-constrained consumer electronics PCBs. 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 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; must be held low ≥6.72s with MR2 |
| 4 | MR2 | Active-low manual reset input with internal 50kΩ pullup; dual-input mode requires simultaneous low assertion with MR1 |
| 5 | RSTIN | High-impedance adjustable-threshold input; connects to resistor divider for custom voltage monitoring |
| 6 | RESET | Active-low open-drain output; requires external pullup resistor (≥20kΩ to VCC or other logic rail) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main VCC (2.925V) and auxiliary rail (via RSTIN) with separate comparators |
| Extended manual reset immunity | 6.72s setup period eliminates false triggers from mechanical switch bounce or user interface noise |
| Adjustable threshold down to 0.63V | Enables precise monitoring of low-voltage rails (e.g., 1.2V, 1.8V cores) using high-value external resistors |
| Guaranteed reset validity to 1.0V VCC | Ensures deterministic behavior during deep power collapse where most supervisors fail |
| Low 6µA quiescent current | Minimizes standby power impact in always-on consumer devices like cable modems and media players |
Applications
| Set-Top Box Power Sequencing | DVD Player Brownout Recovery |
|---|---|
|
Use Scenario: Monitors both 3.3V main logic rail and 1.2V video processor core during AC power fluctuations. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET when either rail drops below spec, with 140ms timeout ensuring full SoC reset. Use Value: Prevents corrupted video decoding or HDMI handshake failures by guaranteeing clean restart after brownout. |
Use Scenario: Detects rapid VCC sag during disc spin-up or laser activation in portable DVD players. IC Role / Device Role / Timing Role: Fixed 2.925V VCC monitor triggers RESET on undervoltage; RSTIN monitors 1.8V servo controller rail. Use Value: Avoids motor lockup or optical pickup errors by enforcing hard reset before firmware enters undefined state. |
| Cable Modem Front-Panel Reset | MP3 Player Smart Button Interface |
|
Use Scenario: Implements dual-button hardware reset requiring simultaneous press of "Power" and "Reset" for 6.72s. IC Role / Device Role / Timing Role: MR1 and MR2 inputs enforce coordinated long-press policy; open-drain RESET interfaces to 3.3V µP. Use Value: Eliminates accidental resets during normal operation while enabling service-mode recovery. |
Use Scenario: Uses MR1 for user-initiated hard reset and RSTIN to monitor battery voltage for low-power shutdown. IC Role / Device Role / Timing Role: Adjustable RSTIN threshold (e.g., 2.8V) detects end-of-life battery; MR1 provides 6.72s intentional reset path. Use Value: Extends usable battery life by preventing data corruption during gradual discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6449UT29L | Same pinout, same 2.925V VCC threshold and 0.63V RSTIN reference, but push-pull RESET output instead of open-drain | Requires no external pullup; unsuitable for wired-OR or level-shifted reset buses | Select MAX6449UT29L only if system uses single-supervisor reset tree with no shared RESET line |
| MAX6452UT29L | Same package and thresholds, but adds immediate-response MR2 (rising-edge triggered) alongside extended MR1 | Supports dual-mode reset: long-press for full system reset, short press for interrupt-only signaling | Choose MAX6452UT29L when front-panel UX requires both interrupt-before-reset and hard reset functionality |
Compared with MAX6449UT29L, MAX6450UT29L offers open-drain flexibility for multi-drop reset networks; compared with MAX6452UT29L, it omits immediate MR2 response-simplifying design where only extended reset is needed.
Availability
MAX6450UT29L is available at Aetrix Electronics and suitable for set-top box manufacturing, DVD player production, and cable modem assembly requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX6450UT29L 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 management, sensing, and interface applications.
The MAX6443–MAX6452 family delivers robust microprocessor supervision for consumer electronics, featuring extended manual reset immunity and dual-voltage monitoring to prevent spurious resets in noisy environments.
FAQ
What is the exact VCC reset threshold voltage for MAX6450UT29L?
The MAX6450UT29L has a factory-trimmed VCC reset threshold of 2.925V, with ±1.5% tolerance over the full -40°C to +85°C operating range. This value is confirmed in Table 1 of the datasheet, where the "29" suffix maps to 2.925V nominal threshold. The MAX6450UT29L uses this fixed threshold to monitor the primary supply rail independently of the adjustable RSTIN input.
Does MAX6450UT29L support monitoring a 1.8V rail?
Yes, the MAX6450UT29L supports monitoring a 1.8V rail via its RSTIN pin using an external resistor divider. With a precise 0.630V internal reference, the required resistor ratio is R1/R2 = (1.8V / 0.630V) − 1 ≈ 1.86. Selecting R2 = 250kΩ yields R1 ≈ 465kΩ, enabling accurate 1.8V threshold detection. This capability is explicitly documented in the Adjustable Input Voltage section of the MAX6450UT29L datasheet.
What is the function of the MR2 pin on MAX6450UT29L?
On the MAX6450UT29L, the MR2 pin is an active-low manual reset input that operates identically to MR1: it requires simultaneous assertion with MR1 for ≥6.72s to trigger the RESET pulse. Unlike MAX6452UT29L, MAX6450UT29L does not implement immediate-response MR2 functionality. This dual-extended setup prevents accidental resets and is validated in the Pin Description table and Manual Reset Input Options section of the MAX6450UT29L datasheet.
Can MAX6450UT29L operate with VCC below 1.0V?
No, the MAX6450UT29L is specified to operate from VCC = 1.0V to 5.5V. Below 1.0V, the internal circuitry cannot guarantee valid RESET output state or comparator accuracy. The datasheet explicitly states "Guaranteed Valid Reset Down to VCC = 1.0V" and defines absolute minimum VCC as -0.3V (stress rating only). For sub-1V operation, alternative supervisors with different architectures must be considered.
What package type and dimensions does MAX6450UT29L use?
The MAX6450UT29L uses a 6-pin SOT23 package (package code U6-1, outline 21-0058, land pattern 90-0175), measuring 2.9mm × 1.6mm × 1.1mm. This compact footprint is confirmed in the Ordering Information and Package Information sections of the datasheet, and matches the pin configuration diagram for MAX6449–MAX6452 variants. Lead-free versions are designated with "+T" suffix.
MAX6450UT29L 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 FAQ
1.How can I place an order for MAX6450UT29L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6450UT29L 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 reliable?
The price and inventory of MAX6450UT29L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6450UT29L is usually 5 days.
3.What payment methods are accepted for MAX6450UT29L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6450UT29L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6450UT29L?
MAX6450UT29L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6450UT29L 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?
For technical support, including MAX6450UT29L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6450UT29L requirements.
6.How does Aetrix verify that MAX6450UT29L is sourced from the original manufacturer or authorized distributors?
All MAX6450UT29L 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 meets industry standards.
7.What is the process for return or replacement of MAX6450UT29L?
All MAX6450UT29L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6450UT29L, 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 part is unused and in its original packaging.
Return procedure for MAX6450UT29L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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