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Analog Devices Inc./Maxim Integrated MAX6445UK46L-T
- Part No.:
- MAX6445UK46L-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK46L-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6445UK46L-T from Maxim Integrated is a dual-manual-reset microprocessor supervisor IC with fixed 4.625V VCC reset threshold, 6.72s extended setup period for both MR1 and MR2 inputs, push-pull active-low RESET output, and guaranteed operation from -40°C to +85°C. It monitors VCC only (no RSTIN), rejects nuisance resets from short switch closures, and delivers a 140ms min one-shot reset pulse-ideal for set-top boxes and cable modems requiring robust front-panel reset immunity.
For engineers reviewing the MAX6445UK46L-T datasheet, MAX6445UK46L-T pinout, MAX6445UK46L-T application, or MAX6445UK46L-T equivalent, this page provides verified technical context, exact pin functions, real-world timing behavior (tMR = 6.72s, tRP = 140ms min), supply current (6µA typ at 3.6V), and validated alternatives for dual-extended-reset supervisor replacement in industrial and consumer embedded systems.
Technical Context
The MAX6445UK46L-T implements dual independent manual reset inputs (MR1 and MR2), both requiring simultaneous low assertion for ≥6.72s to trigger a one-shot RESET pulse-preventing accidental resets from brief button presses. Its internal 50kΩ pullup on each MR input enables direct connection to mechanical switches without external components.
VCC monitoring uses a precision 4.625V ±0.125V threshold with 60ppm/°C tempco and 2×VTH hysteresis; RESET asserts when VCC falls below threshold and remains asserted for 210ms (typ) after VCC recovers. The push-pull RESET output sinks 3.2mA at VCC ≥4.25V with VOL ≤0.4V, ensuring reliable µP reset signaling across full operating voltage range (1.0V–5.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±0.125V - precisely holds system reset until main supply stabilizes above nominal 4.63V level |
| Manual Reset Setup Period (tMR) | 6.72s (L-suffix) - requires sustained dual-button press to prevent false resets during normal UI interaction |
| Reset Timeout Period (tRP) | 140ms (min) - guarantees minimum reset pulse width compatible with µP reset input timing requirements |
| VCC Supply Current | 6µA (typ at 3.6V) - enables battery-backed or ultra-low-power applications without compromising supervision integrity |
| Operating Voltage Range | 1.0V to 5.5V - ensures valid RESET logic state even during deep brownout conditions down to 1.0V VCC |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and supports direct interface to CMOS µP reset inputs |
| Temperature Range | -40°C to +85°C - fully specified for industrial and extended-temperature consumer equipment deployment |
Pinout & Package
MAX6445UK46L-T is housed in a 5-pin SOT23 package (U5-1 outline, 90-0174 land pattern), with exposed pad not connected. Pin functions are validated per Maxim's official pin description and functional diagram.
| 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 and monitored voltage source; powers internal circuitry and sets RESET output high-level compliance |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup to VCC; must be held low ≥6.72s with MR2 to assert RESET |
| 4 | MR2 | Active-low manual reset input with internal 50kΩ pullup to VCC; dual assertion with MR1 required for reset initiation |
| 5 | RESET | Active-low push-pull output; drives low for ≥140ms upon valid dual-MR event or VCC brownout recovery |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset | MR1 and MR2 both require ≥6.72s low assertion-enables two-button reset protocol to eliminate accidental system resets |
| Precision VCC threshold | 4.625V ±0.125V with 60ppm/°C drift-ensures consistent reset point across temperature without calibration |
| Ultra-low quiescent current | 6µA typical at 3.6V-extends battery life in always-on consumer devices like set-top boxes and modems |
| Brownout immunity | Valid RESET assertion guaranteed down to VCC = 1.0V-maintains supervision integrity during severe supply sag |
| Push-pull RESET output | No external pullup needed; sinks 3.2mA at 4.25V-directly drives standard µP reset pins without signal degradation |
Applications
| Set-Top Box Front-Panel Reset | Cable Modem System Recovery |
|---|---|
Use Scenario: User holds "Power" and "Menu" buttons simultaneously for >6.72s to force hard reset after firmware hang. IC Role / Device Role / Timing Role: MAX6445UK46L-T supervises VCC and validates dual-MR long-press before issuing 140ms min RESET pulse to MCU. Use Value: Prevents unintended resets during normal remote control or front-panel navigation while enabling deliberate recovery. |
Use Scenario: Field technician applies dual-button reset to restore network connectivity after DSL sync failure. IC Role / Device Role / Timing Role: MAX6445UK46L-T monitors 3.3V rail and enforces 6.72s setup window to ensure reset only occurs after confirmed user intent. Use Value: Eliminates need for power cycle, reducing downtime and avoiding capacitor stress from repeated AC cycling. |
| Industrial HMI Panel Reset | DVD Player Power-On Sequencing |
Use Scenario: Maintenance mode requires simultaneous press of "Service" and "Reset" keys for 6.72s to enter diagnostic boot. IC Role / Device Role / Timing Role: MAX6445UK46L-T acts as secure reset arbiter-only releases RESET after both MR inputs meet extended timeout. Use Value: Adds hardware-level protection against unauthorized or accidental reconfiguration of critical control parameters. |
Use Scenario: DVD player powers up with VCC ramp; MAX6445UK46L-T holds RESET low until 4.625V is stable, then pulses 140ms to initialize SoC. IC Role / Device Role / Timing Role: MAX6445UK46L-T provides precise VCC brownout detection and timed release to synchronize MCU startup with power rail stability. Use Value: Guarantees clean boot sequence by preventing premature execution before 3.3V/1.2V rails settle within spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6446UK46L-T | Identical VCC threshold (4.625V), same 6.72s tMR, but open-drain RESET output instead of push-pull | Requires external pullup resistor; suited for level-shifting or wired-OR reset bus configurations | Select MAX6446UK46L-T only if system design mandates open-drain topology or multi-source reset arbitration |
| TPS3808G33DBVR | Single manual reset input, 3.3V fixed threshold, 200ms reset timeout, 1.8µA ICC-lower current but no dual-MR capability | Lacks dual-button security; suitable for simpler reset protocols where single-switch reset suffices | Choose TPS3808G33DBVR for cost-sensitive, single-reset applications with lower supply voltage (3.3V) and minimal current draw |
Compared with MAX6446UK46L-T, MAX6445UK46L-T eliminates external pullup components and simplifies layout; versus TPS3808G33DBVR, it adds hardware-enforced dual-button reset security and higher-voltage supervision-critical for 5V-based consumer infrastructure equipment.
Availability
MAX6445UK46L-T is available at Aetrix Electronics and suitable for set-top boxes, cable modems, industrial HMIs, and DVD players requiring stable component supply, long-term manufacturability, and guaranteed -40°C to +85°C operation.
Supply support for MAX6445UK46L-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, with emphasis on reliability and integration for demanding environments.
The MAX6443–MAX6452 family was engineered specifically for microprocessor supervision in consumer and industrial equipment where immunity to switch bounce, precise voltage thresholds, and configurable manual reset timing are essential-MAX6445UK46L-T implements the dual-extended-reset variant in SOT23 packaging.
FAQ
What is the exact VCC reset threshold voltage for MAX6445UK46L-T?
The MAX6445UK46L-T has a factory-set VCC reset threshold of 4.625V, with a guaranteed range of 4.50V to 4.75V over temperature. This value is defined by the "46" suffix per Table 1 in the datasheet and is laser-trimmed during production for precision. The threshold exhibits 60ppm/°C tempco and includes 2×VTH hysteresis to prevent chatter near the trip point. MAX6445UK46L-T maintains this accuracy across its full -40°C to +85°C operating range.
How does the dual manual reset function work on MAX6445UK46L-T?
MAX6445UK46L-T requires both MR1 and MR2 inputs to be held low simultaneously for the full 6.72s (L-suffix) setup period before asserting RESET. Neither input alone triggers reset-both must meet the extended timeout. Internal 50kΩ pullups allow direct switch connection, and debouncing is fully integrated. This dual-input requirement prevents accidental resets and enables secure two-button recovery protocols. MAX6445UK46L-T then issues a 140ms minimum one-shot RESET pulse.
Does MAX6445UK46L-T support operation below 1.8V VCC?
Yes, MAX6445UK46L-T is fully guaranteed down to VCC = 1.0V, including valid RESET output logic state. At VCC ≥1.0V, the push-pull RESET output sinks up to 50µA with VOL ≤0.3V, ensuring compatibility with low-voltage µPs. Below 1.0V, RESET behavior is not specified-but the device continues monitoring and will assert RESET as VCC rises back through threshold. MAX6445UK46L-T's 6µA typical supply current at 3.6V further supports low-power system design.
What package type and footprint does MAX6445UK46L-T use?
MAX6445UK46L-T is packaged in a 5-pin SOT23 (U5-1 outline, land pattern 90-0174), with pin 1 marked by a dot. The package measures 2.9mm × 1.6mm × 1.1mm and features gull-wing leads compatible with standard reflow profiles. Lead-free versions replace "-T" with "+T" in the part number. MAX6445UK46L-T's compact size and thermal performance (571mW max dissipation at +70°C) make it ideal for space-constrained consumer electronics PCBs.
Can MAX6445UK46L-T monitor an external voltage via RSTIN?
No, MAX6445UK46L-T does not include an RSTIN pin and cannot monitor external voltages. It is a single-supply VCC-only supervisor (per Ordering Information table and Pin Configurations). Only MAX6449–MAX6452 variants feature RSTIN for adjustable-threshold monitoring. MAX6445UK46L-T's functionality is strictly limited to VCC supervision with dual extended-setup manual reset-confirmed by its 5-pin SOT23 pinout (GND, VCC, MR1, MR2, RESET) and absence of RSTIN in all electrical and functional diagrams.
MAX6445UK46L-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- 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-23-5
MAX6445UK46L-T FAQ
1.How can I place an order for MAX6445UK46L-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK46L-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 MAX6445UK46L-T reliable?
The price and inventory of MAX6445UK46L-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK46L-T is usually 5 days.
3.What payment methods are accepted for MAX6445UK46L-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK46L-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK46L-T?
MAX6445UK46L-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK46L-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 MAX6445UK46L-T?
For technical support, including MAX6445UK46L-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK46L-T requirements.
6.How does Aetrix verify that MAX6445UK46L-T is sourced from the original manufacturer or authorized distributors?
All MAX6445UK46L-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 MAX6445UK46L-T meets industry standards.
7.What is the process for return or replacement of MAX6445UK46L-T?
All MAX6445UK46L-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK46L-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 MAX6445UK46L-T part is unused and in its original packaging.
Return procedure for MAX6445UK46L-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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