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Analog Devices Inc./Maxim Integrated MAX6444US16L
- Part No.:
- MAX6444US16L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6444US16L.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
MAX6444US16L from Maxim Integrated is a single-supply microprocessor supervisory circuit with fixed 1.575V reset threshold, active-low open-drain RESET output, and extended manual reset setup period of 6.72s. It monitors VCC only, asserts reset during brownout/power-down, and guarantees valid operation down to VCC = 1.0V. Used in set-top boxes and consumer electronics for reliable power-on initialization.
For engineers reviewing the MAX6444US16L datasheet, MAX6444US16L pinout, MAX6444US16L application, or MAX6444US16L equivalent, this page delivers verified electrical parameters, SOT143 package details, manual reset timing constraints, reset timeout behavior, and real-world use cases - all confirmed from Maxim's official datasheet Rev 3 (6/2010).
Technical Context
The MAX6444US16L implements a precision voltage monitor with factory-trimmed 1.575V threshold (±1.5% over -40°C to +85°C), 60ppm/°C tempco, and 2×VTH hysteresis. Its internal timing logic enforces a 6.72s minimum low pulse width on MR1 before asserting RESET, eliminating nuisance resets from momentary switch closures.
RESET is an open-drain output requiring external pull-up; it pulses low for ≥140ms after VCC drops below threshold or after MR1 is held low ≥6.72s. The device draws only 6µA typical supply current at 3.6V and remains functional across full industrial temperature range (-40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.575V ±1.5% - precisely triggers reset when main supply falls below nominal 1.575V, ensuring deterministic microprocessor restart |
| Reset Timeout Period | 140ms min / 210ms typ - guarantees minimum reset assertion duration for full µP initialization sequence |
| Manual Reset Setup Period | 6.72s - prevents accidental reset from brief front-panel button presses; requires sustained press for system recovery |
| Supply Current | 6µA typ at 3.6V - enables ultra-low-power operation in battery-backed or energy-sensitive consumer devices |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even as VCC decays to 1.0V, critical for brownout detection |
| Output Type | Active-low open-drain - allows level-shifting and wired-OR configuration with other reset sources |
| Package | SOT143 (4-pin) - compact 1.3mm × 2.9mm footprint suitable for space-constrained PCB layouts |
Pinout & Package
SOT143 package: 4-pin, surface-mount, lead-free compatible (U4-1 outline), 1.3mm × 2.9mm body, 0.95mm height, 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for all internal circuits; must be connected to system ground plane for stable threshold accuracy |
| 2 - RESET | Active-low open-drain output | Drives low to assert reset; requires external pull-up resistor (≥20kΩ to VCC) to generate high state |
| 3 - MR1 | Manual reset input, active-low | Internally pulled up to VCC via 50kΩ; must be held ≤0.3×VCC for ≥6.72s to trigger one-shot reset pulse |
| 4 - VCC | Power supply and monitored voltage input | Primary supply rail monitored for brownout; powers internal circuitry and sets logic thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Extended manual reset setup period | 6.72s enforced delay prevents false resets from tactile switch bounce or user hesitation |
| Precision fixed reset threshold | 1.575V ±1.5% ensures accurate power-rail monitoring without external resistors or calibration |
| Ultra-low quiescent current | 6µA typical enables >10-year battery life in always-on remote controls or IoT edge sensors |
| Valid reset down to VCC = 1.0V | Guarantees clean reset assertion even during deep brownout, avoiding undefined µP states |
| Open-drain RESET output | Supports mixed-voltage systems: pull-up can connect to any rail ≤6V, enabling interface to 1.8V/2.5V/3.3V/5V µPs |
Applications
| Set-Top Box Power Sequencing | Consumer Audio Device Recovery |
|---|---|
Use Scenario: Set-top box experiences intermittent power dropout due to unstable AC adapter; firmware hangs but hardware remains powered. IC Role / Device Role / Timing Role: MAX6444US16L monitors 1.5V core rail and asserts open-drain RESET to SoC upon drop below 1.575V, holding reset ≥140ms for full reinitialization. Use Value: Prevents corrupted HDMI handshake or tuner lock failure by enforcing complete cold boot instead of partial resume. |
Use Scenario: Bluetooth speaker enters unrecoverable audio buffer deadlock after firmware update; user holds power button to force hard reset. IC Role / Device Role / Timing Role: MR1 tied to front-panel switch; 6.72s press triggers one-shot RESET pulse, isolating reset from short keypresses used for volume/mute. Use Value: Eliminates need for separate service-mode button; end-user achieves recovery using standard UI controls. |
| DVD Player Brownout Protection | Industrial Remote Terminal Boot Integrity |
Use Scenario: DVD player powered from shared wall-wart supply; adjacent motor load causes 100ms dip in 3.3V rail during disc spin-up. IC Role / Device Role / Timing Role: MAX6444US16L monitors 1.5V logic rail derived from 3.3V; ignores transients <20µs at 100mV overdrive per immunity curve. Use Value: Avoids spurious disc-eject or menu reset during normal mechanical operation, improving perceived reliability. |
Use Scenario: Remote telemetry terminal deployed in unattended outdoor cabinet; wide-temp operation required with no field service access. IC Role / Device Role / Timing Role: Supervises 1.5V FPGA configuration rail; guarantees RESET assertion across -40°C to +85°C with 60ppm/°C tempco stability. Use Value: Ensures deterministic boot under extreme thermal cycling, preventing field failures from marginal voltage margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6443US16L | Push-pull RESET output (vs. open-drain); identical threshold, timing, and package | Requires no external pull-up; unsuitable for wired-OR reset buses or level-shifting | Select when driving single µP reset pin directly and board space prohibits pull-up resistor placement |
| TPS3808G16DBVR | 1.6V threshold (±0.5%), 200ms timeout, 3.3µA ICC, SOT23-5 package with EN input | Includes enable input for reset disable during sleep; higher accuracy but longer timeout and different pinout | Choose when system requires programmable reset disable or tighter threshold tolerance, accepting SOT23-5 layout change |
Compared with MAX6443US16L, the MAX6444US16L trades push-pull simplicity for open-drain flexibility in multi-source reset systems; versus TPS3808G16DBVR, it offers lower cost and proven long-setup immunity but lacks enable control and uses legacy SOT143 packaging.
Availability
MAX6444US16L is available at Aetrix Electronics and suitable for set-top boxes, consumer audio devices, DVD players, and industrial remote terminals requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6444US16L 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, serving industrial, automotive, and communications markets.
The MAX6444US16L belongs to the MAX6443–MAX6452 family of µP reset circuits engineered specifically for robust manual reset handling in consumer electronics - prioritizing nuisance-reset immunity and low-power supervision over feature complexity.
FAQ
What is the exact reset threshold voltage of the MAX6444US16L?
The MAX6444US16L has a factory-set VCC reset threshold of 1.575V, with ±1.5% tolerance over -40°C to +85°C and 60ppm/°C temperature coefficient. This value is encoded in the "16" suffix per Table 1 of the datasheet and is laser-trimmed during production - no external components affect this threshold.
Does the MAX6444US16L support dual-supply monitoring?
No. The MAX6444US16L monitors only the VCC supply rail. Unlike MAX6449–MAX6452 variants, it does not include an RSTIN pin for adjustable external voltage monitoring. Its function is strictly single-supply supervision with fixed 1.575V threshold.
What is the purpose of the 6.72s manual reset setup period in the MAX6444US16L?
The 6.72s setup period (encoded by "L" suffix) requires MR1 to remain low for that duration before RESET asserts. This prevents accidental resets from brief switch closures - common in consumer front panels - while allowing intentional long-press recovery. It is implemented via internal RC timing, not software.
Can the MAX6444US16L operate with VCC below 1.5V?
Yes. The MAX6444US16L guarantees valid RESET assertion down to VCC = 1.0V, and its supply current remains stable across 1.0V–5.5V. However, RESET output low voltage (VOL) specification applies only at VCC ≥ 1.00V with 50µA sink current - functionality degrades below 1.0V.
Is the MAX6444US16L pin-compatible with other parts in the MAX6443–MAX6452 family?
No. The MAX6444US16L uses the 4-pin SOT143 package (pins: GND, RESET, MR1, VCC). Parts with RSTIN (e.g., MAX6449) or MR2 (e.g., MAX6445) require 5- or 6-pin SOT23 packages and are not physically or electrically pin-compatible - PCB redesign is required for substitution.
MAX6444US16L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6444US16L FAQ
1.How can I place an order for MAX6444US16L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6444US16L 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 MAX6444US16L reliable?
The price and inventory of MAX6444US16L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6444US16L is usually 5 days.
3.What payment methods are accepted for MAX6444US16L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6444US16L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6444US16L?
MAX6444US16L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6444US16L 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 MAX6444US16L?
For technical support, including MAX6444US16L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6444US16L requirements.
6.How does Aetrix verify that MAX6444US16L is sourced from the original manufacturer or authorized distributors?
All MAX6444US16L 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 MAX6444US16L meets industry standards.
7.What is the process for return or replacement of MAX6444US16L?
All MAX6444US16L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6444US16L, 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 MAX6444US16L part is unused and in its original packaging.
Return procedure for MAX6444US16L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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