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Analog Devices Inc./Maxim Integrated MAX6445UK46L
- Part No.:
- MAX6445UK46L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK46L.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:304
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Product details
Overview
MAX6445UK46L from Maxim Integrated is a dual-manual-reset, fixed-threshold microprocessor supervisor IC with 4.625V VCC reset threshold, 6.72s extended manual reset setup period (L suffix), and push-pull active-low RESET output. It monitors a single supply (VCC) and provides immunity to short switch closures and voltage transients in embedded power-management circuits. Used in set-top boxes and industrial equipment for reliable brownout and hard-reset control.
For engineers reviewing the MAX6445UK46L datasheet, MAX6445UK46L pinout, MAX6445UK46L application, or MAX6445UK46L equivalent, key selection considerations include its dual extended-setup MR inputs, guaranteed RESET validity down to VCC = 1.0V, 6µA quiescent current, and SOT23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6445UK46L implements a precision bandgap-based voltage monitor with 4.625V factory-set VCC threshold and ±0.125V hysteresis. Its dual manual reset inputs (MR1 and MR2) require simultaneous low assertion for ≥6.72s to trigger a one-shot 140ms–280ms RESET pulse - preventing nuisance resets from front-panel switches.
RESET output is push-pull active-low, sinking up to 3.2mA at VCC ≥ 4.25V with VOL ≤ 0.4V, and guaranteed functional down to VCC = 1.0V. Internal 50kΩ pullups on MR1/MR2 eliminate external biasing, and the device operates across –40°C to +85°C with 60ppm/°C reset threshold tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±0.125V - precisely triggers reset when main supply drops below nominal 4.6V rail, e.g., during 5V system brownout. |
| Manual Reset Setup Period | 6.72s (L suffix) - requires sustained dual-button press to avoid accidental resets; enables service-mode entry in consumer devices. |
| Reset Timeout Period | 140ms (min) to 280ms (max) - ensures µP receives sufficient hold time for full initialization after power recovery or manual reset. |
| Supply Current | 6µA (typ) at VCC = 3.6V - enables always-on supervision in battery-backed or ultra-low-power systems without significant drain. |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET logic even as VCC decays to 1.0V, critical for orderly shutdown sequencing. |
| Output Type | Active-low push-pull - drives RESET directly without external pullup; compatible with standard CMOS µP reset inputs. |
| Temperature Range | –40°C to +85°C - fully specified for industrial and automotive cabin environments without derating. |
Pinout & Package
MAX6445UK46L is housed in a 5-pin SOT23 package (U5-1 outline), footprint-compatible with industry-standard 2.9mm × 1.6mm land patterns. Pin 1 is GND; pin 2 is VCC; pin 3 is RESET; pin 4 is MR1; pin 5 is MR2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for internal comparators and output driver; must be low-impedance connection to system ground plane. |
| 2 VCC | Supply input & monitored voltage | Power source for IC and primary voltage rail under supervision; reset asserts when this pin falls below 4.625V. |
| 3 RESET | Active-low push-pull output | Drives µP reset pin low for 140–280ms; sinks 3.2mA at VCC ≥ 4.25V; no external pullup required. |
| 4 MR1 | Extended-setup manual reset input | Active-low input with internal 50kΩ pullup to VCC; must be held low ≥6.72s with MR2 to initiate reset pulse. |
| 5 MR2 | Extended-setup manual reset input | Active-low input with internal 50kΩ pullup to VCC; both MR1 and MR2 must be asserted simultaneously for valid reset trigger. |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset inputs | MR1 and MR2 both require ≥6.72s low assertion - prevents false resets from momentary button presses in consumer front panels. |
| Precision 4.625V reset threshold | Factory-trimmed ±0.125V tolerance - eliminates need for external resistor dividers when supervising standard 5V or 4.8V rails. |
| 6µA supply current | Enables permanent supervision in energy-harvesting or coin-cell-powered systems without measurable battery depletion. |
| Guaranteed RESET down to VCC = 1.0V | Ensures deterministic reset behavior during deep brownout - avoids undefined µP states when supply collapses gradually. |
| Transient immunity | Rejects <20µs VCC glitches dropping ≤100mV below threshold - suppresses noise-induced resets in electrically noisy industrial enclosures. |
Applications
| Set-Top Box Power Sequencing | Industrial PLC Controller Supervision |
|---|---|
|
Use Scenario: Managing safe boot and recovery of media processor and tuner subsystems after AC loss or firmware crash. IC Role / Device Role / Timing Role: Monitors 3.3V and 5V rails; asserts RESET for ≥140ms upon undervoltage or dual-button service reset. Use Value: Prevents corrupted firmware execution by ensuring µP remains held in reset until all supplies stabilize post-brownout. |
Use Scenario: Ensuring deterministic restart of programmable logic controllers during factory floor voltage sags or EMI events. IC Role / Device Role / Timing Role: Dual MR inputs enable technician-initiated reset only after simultaneous press of two safety interlock buttons (6.72s). Use Value: Eliminates unintended reboots from relay contact bounce or transient coupling on control wiring. |
| Medical Infusion Pump Safety Reset | DVD Player Front-Panel Reset |
|
Use Scenario: Providing fail-safe reset initiation during critical therapy interruptions or user-requested system reboot. IC Role / Device Role / Timing Role: Supervises 5V main rail; RESET output drives safety-critical microcontroller reset pin with push-pull drive. Use Value: Guarantees reset assertion even if VCC decays to 1.0V - essential for meeting IEC 62304 power-fail response requirements. |
Use Scenario: Enabling user-accessible hard reset without requiring disassembly or service mode entry. IC Role / Device Role / Timing Role: MR1 and MR2 connected to "Power" and "Eject" buttons; reset triggered only when both pressed ≥6.72s. Use Value: Blocks accidental resets during normal operation while allowing intentional recovery from frozen UI states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6446UK46L | Identical specs except open-drain RESET output (requires external pullup resistor). | Suitable where level-shifting or wired-OR reset bus is needed; not drop-in for push-pull-driven µP inputs. | Select MAX6446UK46L only if system design already uses open-drain reset architecture or requires multi-source reset arbitration. |
| TPS3808G33DBVR | Single manual reset input, 3.3V fixed threshold, 200ms timeout, 1.6µA ICC - lower current but no dual-MR capability. | Applicable for simpler reset needs in 3.3V-only systems; lacks extended dual-button security for service access. | Choose TPS3808G33DBVR for cost-sensitive, single-rail 3.3V designs where dual-MR setup is unnecessary. |
Compared with MAX6445UK46L, MAX6446UK46L offers identical supervision and timing but requires external pullup for RESET, while TPS3808G33DBVR reduces quiescent current by 73% but sacrifices dual manual reset security and 4.6V threshold accuracy - making MAX6445UK46L optimal for robust, dual-button-secured 5V-system supervision.
Availability
MAX6445UK46L is available at Aetrix Electronics and suitable for set-top boxes, industrial PLCs, medical infusion pumps, and DVD players requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6445UK46L 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 - emphasizing high reliability and extended temperature performance.
The MAX6443–MAX6452 family delivers microprocessor supervisors with extended manual reset setup periods, targeting consumer, industrial, and medical systems where accidental resets must be prevented without sacrificing brownout protection.
FAQ
What is the exact reset threshold voltage for MAX6445UK46L?
The MAX6445UK46L has a factory-set VCC reset threshold of 4.625V with ±0.125V tolerance over –40°C to +85°C. This value is defined by the "46" suffix per Table 1 and is laser-trimmed during production - no external components are needed to achieve precise 4.6V supervision.
Does MAX6445UK46L support dual manual reset inputs with independent timing?
No - MAX6445UK46L requires both MR1 and MR2 to be held low simultaneously for the full 6.72s (L suffix) extended setup period to assert RESET. It does not support independent or staggered activation; both inputs function as a logical AND gate for reset initiation.
Can MAX6445UK46L operate with VCC below 1.0V?
MAX6445UK46L is guaranteed to provide valid RESET output only down to VCC = 1.0V. Below that, RESET logic state becomes indeterminate. For operation down to 0V, a pulldown resistor is required - but only for push-pull versions like MAX6445UK46L, not open-drain variants.
What is the RESET output drive strength of MAX6445UK46L?
The MAX6445UK46L features a push-pull active-low RESET output capable of sinking 3.2mA at VCC ≥ 4.25V with VOL ≤ 0.4V. At lower VCC (e.g., 1.8V), it sinks 200µA with VOL ≤ 0.8×VCC - ensuring compatibility with modern low-voltage µPs.
Is MAX6445UK46L RoHS-compliant and available in lead-free packaging?
Yes - MAX6445UK46L is offered in lead-free packaging. Specify "+T" instead of "-T" in the order code (e.g., MAX6445UK46L+T) to receive RoHS-compliant, lead-free SOT23-5 units. Standard tape-and-reel packaging supports automated assembly.
MAX6445UK46L 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:
- 4.63V
- 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 FAQ
1.How can I place an order for MAX6445UK46L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK46L 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 reliable?
The price and inventory of MAX6445UK46L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK46L is usually 5 days.
3.What payment methods are accepted for MAX6445UK46L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK46L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK46L?
MAX6445UK46L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK46L 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?
For technical support, including MAX6445UK46L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK46L requirements.
6.How does Aetrix verify that MAX6445UK46L is sourced from the original manufacturer or authorized distributors?
All MAX6445UK46L 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 meets industry standards.
7.What is the process for return or replacement of MAX6445UK46L?
All MAX6445UK46L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK46L, 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 part is unused and in its original packaging.
Return procedure for MAX6445UK46L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6445UK46L Tags
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