My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6444US31L+T
- Part No.:
- MAX6444US31L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6444US31L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,219
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6444US31L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with one extended-setup manual reset input (MR1), active-low open-drain RESET output, 3.075V VCC reset threshold, and 6.72s manual reset setup period. It monitors VCC only, asserts RESET when VCC drops below 3.075V, holds RESET low for 210ms (typ) after recovery, and ignores short switch closures-ideal for consumer electronics power sequencing and brownout protection.
For engineers reviewing the MAX6444US31L+T datasheet, MAX6444US31L+T pinout, MAX6444US31L+T application, or MAX6444US31L+T equivalent, key selection criteria include its 3.075V precision reset threshold, 6.72s MR1 setup timeout, 4-pin SOT143 package, -40°C to +85°C operation, and immunity to <20µs transients at 100mV overdrive-critical for reliable front-panel reset implementation in set-top boxes and DVD players.
Technical Context
The MAX6444US31L+T implements a dedicated voltage-monitoring comparator with 60ppm/°C tempco and 2×VTH hysteresis, paired with a digital timing block that enforces a fixed 6.72s low assertion on MR1 before generating a 140ms (min) one-shot RESET pulse. Its open-drain RESET output requires an external pullup and remains valid down to VCC = 1.0V.
It operates as a standalone supervisory circuit with no internal regulator or watchdog timer-only VCC monitoring and manual reset debouncing. The 4-pin SOT143 package integrates GND, VCC, MR1, and RESET terminals with internal 50kΩ MR1 pullup and guaranteed 0.3V VOL at 50µA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.075V ±0.075V - precisely triggers reset during 3.3V system brownout |
| Manual Reset Setup Period (tMR) | 6.72s typ - prevents nuisance resets from brief front-panel button presses |
| Reset Timeout Period (tRP) | 210ms typ - ensures µP reset pulse meets minimum hold-time requirements |
| Supply Current (ICC) | 6µA typ at 3.6V - enables always-on supervision in battery-backed systems |
| Operating Temperature | -40°C to +85°C - supports industrial and consumer ambient conditions |
| RESET Output Type | Active-low open-drain - allows level-shifting to diverse logic supplies via external pullup |
| Package | 4-pin SOT143 - compact footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6444US31L+T is housed in a 4-pin SOT143 package (outline 21-0052) with gull-wing leads, 1.3mm × 2.1mm body size, and 0.95mm pitch. Pin 1 is GND, Pin 2 is VCC, Pin 3 is MR1, and Pin 4 is RESET.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal circuits; must be low-impedance connection to system ground plane |
| VCC (Pin 2) | Power supply and monitored voltage input | Supplies IC core and serves as primary reset monitor source; valid from 1.0V to 5.5V |
| MR1 (Pin 3) | Active-low manual reset input | Internally pulled up to VCC via 50kΩ; must be held low ≥6.72s to trigger one-shot RESET pulse |
| RESET (Pin 4) | Active-low open-drain output | Drives low to assert reset; requires external pullup resistor (≥20kΩ) to target logic supply |
Key Features
| Feature | Design Value |
|---|---|
| Extended manual reset setup period | 6.72s enforced delay prevents false resets from accidental or transient button presses |
| Precision factory-set reset threshold | 3.075V ±0.075V ensures accurate brownout detection in 3.3V systems without external calibration |
| Low quiescent current | 6µA typical ICC enables integration into always-on subsystems without significant battery drain |
| Valid RESET down to VCC = 1.0V | Guaranteed output state integrity during deep brownout, supporting robust µP initialization |
| Transient immunity | Immune to 20µs VCC glitches at 100mV overdrive-reduces spurious resets in noisy power environments |
Applications
| Set-Top Box Power Management | DVD Player Brownout Recovery |
|---|---|
Use Scenario: Monitors 3.3V main supply during AC power cycling and cable disconnection events. IC Role / Device Role / Timing Role: Single-supply supervisor asserting active-low RESET to ARM-based SoC upon VCC drop below 3.075V. Use Value: Prevents corrupted firmware execution by enforcing 210ms minimum reset pulse after supply recovery. | Use Scenario: Detects rapid VCC sag during laser sled motor startup or HDMI hot-plug transients. IC Role / Device Role / Timing Role: Voltage monitor with 6.72s MR1 debounce used for front-panel "reset" button to avoid accidental activation. Use Value: Eliminates nuisance resets while enabling deliberate hard reset via sustained button press. |
| Cable Modem System Initialization | Industrial Control Panel Supervision |
Use Scenario: Ensures clean boot of DOCSIS-compliant processor after upstream power interruption. IC Role / Device Role / Timing Role: Primary reset generator triggered by 3.075V VCC threshold crossing; open-drain RESET interfaces to 3.3V µP reset pin. Use Value: 6µA supply current minimizes standby power draw in always-on broadband equipment. | Use Scenario: Provides fail-safe reset during 24/7 operation in factory automation HMI panels. IC Role / Device Role / Timing Role: Standalone supervisor monitoring 3.3V logic rail; operates across full -40°C to +85°C range. Use Value: Guaranteed performance over extended temperature ensures reliability in uncontrolled industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6444US31K+T | 10.08s MR1 setup period vs. 6.72s; identical VCC threshold and package | Suitable where longer human-accessible reset delay is required (e.g., service mode entry) | Select MAX6444US31K+T only if >6.72s debounce is mandated by safety or UX requirements |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, 3-pin SOT23, push-pull RESET, no manual reset input | Lacks MR1 functionality; intended for simple power-on reset only-not for front-panel reset | Choose TPS3808G33DBVR only for cost-sensitive designs requiring basic VCC monitoring without manual reset capability |
Compared with MAX6444US31K+T, the MAX6444US31L+T offers faster user-initiated reset response; compared with TPS3808G33DBVR, it adds essential manual reset debouncing but requires an external pullup and occupies a larger 4-pin footprint.
Availability
MAX6444US31L+T is available at Aetrix Electronics and suitable for set-top box manufacturing, DVD player design, and cable modem production requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6444US31L+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 across industrial, communications, and consumer markets.
The MAX6443–MAX6452 family delivers ultra-low-power, high-immunity microprocessor reset supervision with configurable manual reset behavior-engineered specifically for front-panel-controlled consumer electronics and embedded systems demanding robust power-up/down sequencing.
FAQ
What is the exact reset threshold voltage of the MAX6444US31L+T?
The MAX6444US31L+T has a factory-trimmed VCC reset threshold of 3.075V, with a guaranteed tolerance of ±0.075V (3.000V to 3.150V) over -40°C to +85°C. This value is fixed and non-adjustable, optimized for reliable supervision of standard 3.3V power rails. The threshold exhibits 60ppm/°C tempco and includes 2×VTH hysteresis to prevent chatter near the trip point. MAX6444US31L+T does not monitor RSTIN-it is a single-supply device.
How does the manual reset function work on the MAX6444US31L+T?
The MAX6444US31L+T features a single active-low manual reset input (MR1) that must be held low for a minimum of 6.72s (typical) before the RESET output pulses low for 140ms (min). This extended setup period prevents false resets from momentary button presses. MR1 includes an internal 50kΩ pullup to VCC, so a simple SPST switch to ground suffices. The MAX6444US31L+T does not support dual or immediate-reset inputs-only MR1 with long setup is implemented.
What package type and pin count does the MAX6444US31L+T use?
The MAX6444US31L+T uses a 4-pin SOT143 package (outline 21-0052), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, and pin 4 = RESET. It measures 1.3mm × 2.1mm with 0.95mm lead pitch and is RoHS-compliant (lead-free, denoted by "+T"). This compact surface-mount package supports high-density PCB layouts and automated assembly. No other package variants exist for this specific part number.
Is the MAX6444US31L+T suitable for automotive applications?
The MAX6444US31L+T is rated for -40°C to +85°C operation and is not AEC-Q100 qualified. While it meets extended temperature requirements, it lacks automotive-specific qualification, traceability, and stress testing. For automotive use, select the AEC-Q100 qualified variant MAX6444US16K/V+T (1.575V threshold) or consult Maxim's automotive-grade alternatives. MAX6444US31L+T is intended for industrial and consumer applications only.
What is the recommended pullup resistor value for the open-drain RESET output of the MAX6444US31L+T?
Maxim specifies a minimum 20kΩ pullup resistor from the MAX6444US31L+T RESET pin to the target logic supply (e.g., 3.3V). A 47kΩ to 100kΩ resistor is commonly used to balance rise time and power consumption. The pullup must connect to the same supply monitored by VCC or another compatible logic rail. Note that RESET sink capability degrades as VCC falls below 1.0V-so the pullup value should be chosen to ensure adequate VOH margin across the full operating range. MAX6444US31L+T does not support push-pull RESET configuration.
MAX6444US31L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6444US31L+T FAQ
1.How can I place an order for MAX6444US31L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6444US31L+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 MAX6444US31L+T reliable?
The price and inventory of MAX6444US31L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6444US31L+T is usually 5 days.
3.What payment methods are accepted for MAX6444US31L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6444US31L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6444US31L+T?
MAX6444US31L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6444US31L+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 MAX6444US31L+T?
For technical support, including MAX6444US31L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6444US31L+T requirements.
6.How does Aetrix verify that MAX6444US31L+T is sourced from the original manufacturer or authorized distributors?
All MAX6444US31L+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 MAX6444US31L+T meets industry standards.
7.What is the process for return or replacement of MAX6444US31L+T?
All MAX6444US31L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6444US31L+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 MAX6444US31L+T part is unused and in its original packaging.
Return procedure for MAX6444US31L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6444US31L+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
