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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 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,328
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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 MR1/MR2 setup period, and push-pull active-low RESET output. It monitors a single supply (VCC) and provides immunity to nuisance resets in consumer electronics power management systems requiring robust front-panel reset control.
For engineers reviewing the MAX6445UK46L+ datasheet, MAX6445UK46L+ pinout, MAX6445UK46L+ application, or MAX6445UK46L+ equivalent, key selection criteria include its dual extended-setup manual reset inputs, guaranteed reset assertion down to VCC = 1.0V, 210ms typical timeout period, low 6µA supply current, and SOT23-5 package compatibility with industrial temperature range (-40°C to +85°C).
Technical Context
The MAX6445UK46L+ implements a precision bandgap-based voltage monitor for VCC with factory-trimmed 4.625V threshold (±130mV), 60ppm/°C tempco, and 2×VTH hysteresis. Its dual manual reset inputs (MR1 and MR2) require simultaneous low assertion for 6.72s before generating a one-shot 140ms–280ms RESET pulse.
RESET output is push-pull active-low with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.55V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 3.15V). Internal 50kΩ pullups on MR1/MR2 eliminate external components, and the device remains functional down to VCC = 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V (factory-trimmed, ±130mV tolerance; ensures reliable reset assertion during 4.5V–4.75V brownout) |
| Manual Reset Setup Period | 6.72s (simultaneous MR1 & MR2 low required; prevents false resets from brief button presses) |
| Reset Timeout Period | 210ms typical (guaranteed ≥140ms; holds µP in reset long enough for full power stabilization) |
| VCC Supply Current | 6µA typical at 3.6V (enables battery-backed operation in always-on consumer devices) |
| Operating Temperature | -40°C to +85°C (fully specified across industrial range; no derating needed) |
| RESET Output Type | Push-pull active-low (drives µP reset pin directly without external pullup; supports 1.0V–5.5V VCC) |
| Package | SOT23-5 (2.9mm × 1.6mm footprint; compatible with high-density PCB layouts) |
Pinout & Package
MAX6445UK46L+ is housed in a 5-pin SOT23 package (package code U5+1, outline 21-0057) with gull-wing leads, RoHS-compliant lead-free finish (+ suffix), and thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry; must be connected to system ground plane for stable reset threshold accuracy |
| 2 | VCC | Main power supply input (1.0V–5.5V); powers internal comparators and drives RESET output stage |
| 3 | MR1 | Active-low manual reset input with internal 50kΩ pullup; requires 6.72s low assertion to trigger RESET |
| 4 | RESET | Active-low push-pull output; asserts low for 140ms–280ms after valid MR1/MR2 or VCC fault condition |
| 5 | MR2 | Active-low manual reset input with internal 50kΩ pullup; both MR1 and MR2 must be held low simultaneously for 6.72s |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset | MR1 and MR2 both require 6.72s low assertion-prevents accidental resets during normal front-panel operation |
| Factory-trimmed 4.625V threshold | ±130mV accuracy over -40°C to +85°C ensures consistent brownout detection for 4.5V–4.75V supplies |
| Guaranteed reset down to VCC = 1.0V | Enables valid RESET assertion even during deep brownout conditions where most supervisors fail |
| Low 6µA quiescent current | Extends battery life in portable consumer devices such as DVD players and MP3 players |
| Push-pull RESET output | Eliminates need for external pullup resistor-reduces BOM count and PCB area in space-constrained designs |
Applications
| Set-Top Box Power Management | DVD Player System Recovery |
|---|---|
Use Scenario: Front-panel power button triggers hard reset only after sustained press to avoid accidental channel-change-induced reboots. IC Role / Device Role / Timing Role: MAX6445UK46L+ acts as dual-input supervised reset controller, asserting RESET only when both MR1 and MR2 are held low for 6.72s. Use Value: Prevents nuisance resets during normal remote-control or panel-button usage while enabling intentional recovery via deliberate long-press. | Use Scenario: Power supply sag during disc spin-up causes transient brownout; system must hold µP in reset until voltage stabilizes. IC Role / Device Role / Timing Role: MAX6445UK46L+ monitors 4.625V VCC rail and asserts RESET for 210ms after voltage recovers above threshold. Use Value: Ensures µP remains held in reset throughout the entire voltage recovery window, eliminating corrupted firmware execution. |
| Cable Modem Firmware Update | Industrial Control Panel Reset |
Use Scenario: Field technician performs emergency firmware reload by pressing two dedicated panel buttons simultaneously. IC Role / Device Role / Timing Role: MAX6445UK46L+ serves as secure dual-button reset enabler-both MR1 and MR2 must be asserted for 6.72s to initiate recovery sequence. Use Value: Adds physical security layer against unintended firmware updates while maintaining simple mechanical interface. | Use Scenario: Operator initiates controlled system restart after maintenance by holding reset button for defined duration. IC Role / Device Role / Timing Role: MAX6445UK46L+ provides deterministic, glitch-immune reset timing with 6.72s setup and 210ms timeout. Use Value: Guarantees clean state transition in safety-critical industrial equipment by eliminating race conditions and noise-induced resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6446UK46L+ | Same 4.625V threshold and 6.72s setup, but open-drain RESET output | Requires external pullup resistor; suitable when level-shifting or wired-OR reset bus is needed | Select MAX6446UK46L+ only if open-drain logic or multi-source reset arbitration is required |
| MAX6445UK44L+ | Identical pinout and timing, but 4.375V reset threshold (vs. 4.625V) | Designed for 4.25V–4.50V supply rails; not interchangeable without verifying VCC margin | Choose MAX6445UK44L+ only when monitoring lower-voltage 4.3V nominal supplies |
Compared with MAX6445UK46L+, MAX6446UK46L+ trades push-pull simplicity for open-drain flexibility, while MAX6445UK44L+ shifts reset sensitivity downward-neither offers drop-in replacement without circuit review.
Availability
MAX6445UK46L+ is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable modems, and industrial control panels requiring stable component supply across extended temperature ranges and long product 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, sensing, and interface applications, with emphasis on reliability and integration.
The MAX6443–MAX6452 family delivers ultra-low-power, extended-setup microprocessor supervisors targeting consumer, industrial, and automotive systems where robust reset control under noisy or intermittent power conditions is critical.
FAQ
What is the exact reset threshold voltage for MAX6445UK46L+?
The MAX6445UK46L+ has a factory-trimmed VCC reset threshold of 4.625V, with a guaranteed range of 4.50V to 4.75V over -40°C to +85°C. This value is fixed and non-adjustable, matching the "46" suffix in the part number per Maxim's ordering guide. The threshold exhibits 60ppm/°C tempco and 2×VTH hysteresis to prevent chatter near the trip point.
Does MAX6445UK46L+ support dual manual reset inputs with independent timing?
No. The MAX6445UK46L+ requires both MR1 and MR2 to be held low *simultaneously* for the full 6.72s extended setup period before asserting RESET. It does not support independent or staggered activation of the two inputs-the dual-input architecture is designed specifically for coordinated, tamper-resistant reset initiation, not separate control paths.
Can MAX6445UK46L+ operate with VCC below 1.0V?
No. The MAX6445UK46L+ is guaranteed to function correctly only down to VCC = 1.0V. Below this voltage, RESET output behavior is not specified: VOL rises unpredictably, and internal comparators may cease accurate monitoring. For applications requiring valid reset signaling down to 0V, a pulldown resistor on the push-pull RESET output is recommended-but this applies only when VCC ≥ 1.0V during assertion.
What is the purpose of the 50kΩ internal pullup resistors on MR1 and MR2 of MAX6445UK46L+?
The 50kΩ internal pullup resistors on MR1 and MR2 of MAX6445UK46L+ ensure default high logic states, eliminating the need for external pullups. They allow direct connection of momentary switches from MRx pins to GND, simplifying front-panel design. These resistors also define the input leakage path during switch closure and contribute to the device's immunity to short transients (<100ns) on the manual reset lines.
Is MAX6445UK46L+ pin-compatible with other devices in the MAX6443–MAX6452 family?
Yes-within the same package type. MAX6445UK46L+ uses the 5-pin SOT23 package (U5+1), sharing identical pinout with all other MAX6445/46/47/48 variants in SOT23-5. However, pin compatibility does not imply functional equivalence: MAX6447/48 add immediate-reset MR2 capability, and MAX6449–6452 add RSTIN input-so substitution requires verification of feature alignment and reset threshold.
MAX6445UK46L+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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.
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