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Analog Devices Inc./Maxim Integrated MAX6445UK26L+T
- Part No.:
- MAX6445UK26L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK26L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,586
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Product details
Overview
MAX6445UK26L+T from Maxim Integrated is a dual manual-reset microprocessor supervisor IC with fixed 2.625V VCC reset threshold, 6.72s extended MR1/MR2 setup period, push-pull active-low RESET output, and guaranteed operation from -40°C to +85°C. It monitors a single supply (VCC) and supports dual long-duration manual reset inputs for nuisance-free system recovery in set-top boxes and industrial equipment.
For engineers reviewing the MAX6445UK26L+T datasheet, MAX6445UK26L+T pinout, MAX6445UK26L+T application, or MAX6445UK26L+T equivalent, key selection criteria include its 2.625V precision reset threshold, 6.72s dual manual reset hold time, 210ms typical reset timeout, low 6µA supply current, and SOT23-5 package compatibility with space-constrained embedded designs.
Technical Context
This device implements dual extended-setup manual reset logic requiring simultaneous low assertion of both MR1 and MR2 for ≥6.72s to trigger a one-shot 140ms–280ms RESET pulse. Its internal 50kΩ pullup on each manual input eliminates external components while ensuring immunity to sub-6.72s switch bounce.
The VCC monitor uses a precision bandgap reference with ±0.5% threshold accuracy (2.625V ±13mV), 60ppm/°C tempco, and hysteresis of ~2×VTH. RESET remains valid down to VCC = 1.0V, with VOL ≤ 0.3V at ISINK = 1.2mA and VOH ≥ 0.8×VCC at ISOURCE = 500µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±13mV - precisely holds system reset until main supply stabilizes above nominal 2.625V rail |
| Manual Reset Setup Period | 6.72s - prevents accidental resets from brief front-panel button presses; requires simultaneous MR1+MR2 low hold |
| Reset Timeout Period | 140ms (min) to 280ms (max) - ensures µP completes full power-on initialization before release |
| Supply Current | 6µA (typ at 3.6V) - enables always-on supervision in battery-backed or ultra-low-power systems |
| Operating Temperature | -40°C to +85°C - fully specified for industrial and automotive cabin environments |
| RESET Output Type | Active-low push-pull - drives µP reset pin directly without external pullup; sinks 1.2mA at VCC ≥ 2.55V |
| Package | 5-pin SOT23 - 2.9mm × 1.6mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6445UK26L+T is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057), with 0.95mm pitch, 1.3mm height, and thermal pad omitted. Pin 1 is GND; pin 2 is VCC; pin 3 is MR1; pin 4 is RESET; pin 5 is MR2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 2 VCC | Main supply input | Power source and monitored voltage rail; supplies internal bias and powers RESET output stage |
| 3 MR1 | Extended manual reset input | Active-low input with 50kΩ internal pullup; must be held low ≥6.72s with MR2 to assert RESET |
| 4 RESET | Active-low push-pull output | Drives µP reset pin directly; asserts low for 140–280ms after valid MR1+MR2 event or VCC brownout |
| 5 MR2 | Extended manual reset input | Active-low input with 50kΩ internal pullup; requires simultaneous low assertion with MR1 for reset generation |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended manual reset inputs | MR1 and MR2 both require ≥6.72s low assertion - prevents false resets from accidental or transient button presses |
| Precision 2.625V reset threshold | ±0.5% accuracy over temperature - ensures reliable detection of 2.6V–2.7V supply rails common in 2.5V/2.8V systems |
| Guaranteed RESET validity down to VCC = 1.0V | Output remains functional during deep brownout - maintains deterministic reset state even as supply collapses |
| Low 6µA quiescent current | Enables permanent supervision in energy-sensitive applications like remote sensors or backup power circuits |
| Push-pull RESET output | No external pullup required - simplifies BOM and layout; drives standard CMOS reset inputs directly |
Applications
| Set-Top Box Power Management | DVD Player System Recovery |
|---|---|
|
Use Scenario: Front-panel power button triggers controlled system restart after firmware hang or HDMI handshake failure. IC Role / Device Role / Timing Role: Dual manual reset supervisor asserting 210ms RESET pulse only after simultaneous 6.72s MR1+MR2 press - distinguishes intentional reset from channel-up/down keypresses. Use Value: Eliminates need for separate debounce hardware; prevents user-induced nuisance resets during normal operation. |
Use Scenario: Recovery from corrupted disc read state or USB peripheral enumeration failure. IC Role / Device Role / Timing Role: Monitors 2.625V core supply and generates precise reset pulse upon detected undervoltage or manual reset command. Use Value: Ensures microcontroller reinitializes all peripherals (optical drive, audio DAC, video decoder) synchronously after stable power restoration. |
| Cable Modem Firmware Update | Industrial HMI Panel Reset |
|
Use Scenario: Forced reboot during failed OTA firmware update to restore bootloader functionality. IC Role / Device Role / Timing Role: Provides fail-safe reset independent of processor-controlled GPIO; asserts RESET for ≥140ms after 6.72s button hold. Use Value: Guarantees complete memory and register reset even if CPU hangs mid-update - no reliance on software watchdog. |
Use Scenario: Field technician-initiated system reset after configuration error or display freeze. IC Role / Device Role / Timing Role: Dual MR inputs wired to service-mode buttons; requires deliberate 6.72s simultaneous press to avoid accidental activation. Use Value: Meets IEC 62368-1 requirement for deliberate human action before safety-critical reset - prevents unintended machine restart. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6445UK26T+T | Same 2.625V threshold and SOT23-5 package, but 1.68s manual reset setup period instead of 6.72s | Suitable for applications needing faster manual reset response, e.g., consumer remotes or portable devices | Select when shorter user-press duration is acceptable and higher nuisance-reset risk is tolerable |
| MAX6446UK26L+T | Identical electrical specs and timing, but open-drain RESET output instead of push-pull | Required when level-shifting to different logic families or driving multiple loads via shared bus | Choose when interfacing with 1.8V/3.3V mixed-voltage systems or when external pullup resistor is preferred |
Compared with MAX6445UK26L+T, the MAX6445UK26T+T reduces manual reset latency by 75% but increases susceptibility to accidental activation, while the MAX6446UK26L+T retains identical timing but trades push-pull drive strength for voltage-level flexibility - both serve distinct system architecture needs without altering core supervision functionality.
Availability
MAX6445UK26L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable modems, industrial HMIs, and medical monitoring devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6445UK26L+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, automotive, and communications markets.
The MAX6443–MAX6452 family delivers robust µP supervision with extended manual reset timing, targeting applications where accidental resets must be eliminated - especially in consumer electronics with mechanical front-panel controls.
FAQ
What is the exact reset threshold voltage of the MAX6445UK26L+T?
The MAX6445UK26L+T has a factory-trimmed VCC reset threshold of 2.625V, with guaranteed limits of 2.55V (min) and 2.70V (max) over -40°C to +85°C. This value is encoded in the "26" suffix per Table 1 of the datasheet and applies specifically to the MAX6445UK26L+T, not the broader MAX6445 family.
How does the dual manual reset function work on the MAX6445UK26L+T?
The MAX6445UK26L+T requires both MR1 and MR2 pins to be held low simultaneously for the full 6.72s extended setup period before asserting RESET. Neither pin alone triggers reset; the dual-input requirement adds deliberate user action, preventing false resets from single-button presses or noise on one line.
Can the MAX6445UK26L+T operate with VCC below 1.0V?
No - the MAX6445UK26L+T guarantees valid RESET output only down to VCC = 1.0V. Below this, RESET current-sinking capability degrades rapidly and output state becomes indeterminate. For operation down to 0V, an external pulldown resistor is required - but only with push-pull versions like the MAX6445UK26L+T, not open-drain variants.
What is the RESET timeout period specification for the MAX6445UK26L+T?
The MAX6445UK26L+T provides a minimum reset timeout of 140ms and a maximum of 280ms, with a typical value of 210ms. This duration is fixed and internally generated - it applies identically whether triggered by VCC brownout or by the dual manual reset input sequence.
Is the MAX6445UK26L+T pin-compatible with other parts in the MAX6443–MAX6452 family?
Yes - the MAX6445UK26L+T uses the 5-pin SOT23 package (U5+1 outline) shared with MAX6445/MAX6446/MAX6447/MAX6448 variants. Pin 1 (GND), pin 2 (VCC), pin 3 (MR1), pin 4 (RESET), and pin 5 (MR2) maintain identical mapping across all SOT23-5 versions, enabling drop-in replacement within same reset threshold and output type.
MAX6445UK26L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- 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
MAX6445UK26L+T FAQ
1.How can I place an order for MAX6445UK26L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK26L+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 MAX6445UK26L+T reliable?
The price and inventory of MAX6445UK26L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK26L+T is usually 5 days.
3.What payment methods are accepted for MAX6445UK26L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK26L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK26L+T?
MAX6445UK26L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK26L+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 MAX6445UK26L+T?
For technical support, including MAX6445UK26L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK26L+T requirements.
6.How does Aetrix verify that MAX6445UK26L+T is sourced from the original manufacturer or authorized distributors?
All MAX6445UK26L+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 MAX6445UK26L+T meets industry standards.
7.What is the process for return or replacement of MAX6445UK26L+T?
All MAX6445UK26L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK26L+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 MAX6445UK26L+T part is unused and in its original packaging.
Return procedure for MAX6445UK26L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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