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Analog Devices Inc./Maxim Integrated MAX6344SUT+T
- Part No.:
- MAX6344SUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6344SUT+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:980
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Product details
Overview
MAX6344SUT+T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit in a 6-pin SOT23 package, designed to monitor VCC supply voltage and assert reset when it falls below a factory-trimmed 2.93V threshold. It features a dedicated power-fail comparator (PFI/PFO), guaranteed RESET validity down to VCC = +1V, 100ms minimum reset pulse width, and operates across -40°C to +125°C for use in battery-powered telecom and embedded control systems.
For engineers reviewing the MAX6344SUT+T datasheet, MAX6344SUT+T pinout, MAX6344SUT+T application, or MAX6344SUT+T equivalent, this device delivers precise reset timing, dual-voltage monitoring capability via PFI, and robust manual-reset debouncing - critical for reliable power-up sequencing and brownout recovery in multivoltage portable systems.
Technical Context
The MAX6344SUT+T implements a precision bandgap-based reset threshold detector with ±25mV accuracy over temperature, paired with a dedicated 1.25V reference for the PFI input. Its active-high push-pull RESET output drives logic-high during normal operation and asserts low for ≥100ms after VCC rises above 2.93V or MR transitions high.
It integrates a CMOS-compatible manual-reset input (MR) with 1µs glitch rejection and 100kΩ internal pull-up, and supports independent power-fail warning via PFO - which asserts low when PFI drops below 1.25V - enabling early shutdown signaling without affecting reset state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V ±25mV (factory-trimmed; ensures accurate brownout detection at nominal 3.0V rail) |
| Supply Voltage Range | +1.0V to +5.5V (enables operation during deep brownout and compatibility with 1.2V–5V systems) |
| RESET Pulse Width | 100ms min (guarantees µP initialization completes before release) |
| PFI Threshold | +1.25V (fixed internal reference for configurable power-fail or low-battery warning) |
| Operating Temperature | -40°C to +125°C (supports industrial and automotive under-hood environments) |
| Reset Output Type | Active-high push-pull (drives high-Z to high-impedance state; no external pull-up required) |
| Supply Current | 1.2µA typical at VCC = 3V (ultra-low quiescent current for battery longevity) |
Pinout & Package
MAX6344SUT+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs. Pin assignments are fully validated per Maxim's official pin configuration diagram (Rev 2, 12/05).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply Input | Primary power rail input; reset assertion triggered when voltage falls below 2.93V |
| 2 - GND | Ground Reference | Analog and digital ground return; must be low-impedance for stable threshold accuracy |
| 3 - PFI | Power-Fail Input | Monitors external voltage divider; asserts PFO low when input < 1.25V |
| 4 - PFO | Power-Fail Output | Open-drain output used for early-warning interrupt or secondary reset trigger |
| 5 - MR | Manual-Reset Input | CMOS-compatible active-low input; debounced internally; pulls RESET low when asserted |
| 6 - RESET | Active-High Reset Output | Push-pull output; drives high during normal operation; goes low for ≥100ms on fault or MR event |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±25mV tolerance over full temperature range - eliminates external resistor calibration |
| Guaranteed RESET validity to VCC = +1V | Ensures clean reset assertion even during severe brownout, preventing µP lockup |
| Dedicated PFI/PFO comparator | Independent 1.25V reference enables dual-supply monitoring without shared reset timing |
| Debounced manual-reset input | 1µs minimum MR pulse width rejection prevents false resets from switch bounce |
| Ultra-low supply current | 1.2µA typical at 3V - extends battery life in always-on portable equipment |
Applications
| Portable/Battery-Powered Equipment | Telecom Equipment |
|---|---|
Use Scenario: Handheld test meters and IoT sensors operating from single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Supervises main 3.0V rail and monitors battery voltage decay via PFI to trigger graceful shutdown before cutoff. Use Value: Prevents data corruption during low-battery brownout using 2.93V reset threshold aligned with typical 3.0V LDO dropout. |
Use Scenario: Line cards and remote radio units requiring stable reset during AC/DC converter transients. IC Role / Device Role / Timing Role: Provides immunity to sub-12µs negative VCC glitches while asserting reset on sustained undervoltage. Use Value: Eliminates spurious reboots caused by switching noise, improving system uptime in dense PCB layouts. |
| Multivoltage Systems | Embedded Control Systems |
Use Scenario: Industrial PLC modules with separate 5V, 3.3V, and 1.8V rails. IC Role / Device Role / Timing Role: Monitors primary 3.3V domain while using PFI to track 5V auxiliary supply via resistor divider. Use Value: Enables coordinated reset sequencing - PFO tied to MR triggers secondary reset if 5V fails first. |
Use Scenario: Automotive body control modules exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Guarantees valid reset assertion from -40°C to +125°C with no external components. Use Value: Meets AEC-Q100 stress requirements for reset reliability without derating or thermal compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6342SUT+T | Active-low push-pull RESET output; includes MR input; same 2.93V threshold and PFI/PFO | Requires inverted reset logic on µP side; suitable where host expects active-low reset signal | Select when interfacing with legacy µPs requiring active-low reset assertion |
| MAX6343SUT+T | Active-low open-drain RESET output; same 2.93V threshold, PFI/PFO, and MR | Needs external pull-up resistor; allows wired-OR reset bus sharing across multiple supervisors | Choose for multi-rail systems needing shared reset bus or level translation to higher voltage domains |
Compared with MAX6342SUT+T and MAX6343SUT+T, the MAX6344SUT+T provides active-high push-pull reset output - eliminating external pull-up components and simplifying interface to modern µPs with active-high reset inputs, while retaining identical monitoring accuracy, temperature range, and power-fail functionality.
Availability
MAX6344SUT+T is available at Aetrix Electronics and suitable for portable computers, telecom equipment, and embedded control systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6344SUT+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 connectivity applications, with emphasis on reliability and integration.
The MAX6342–MAX6345 family targets power-supply supervision in space- and power-constrained digital systems, delivering factory-trimmed accuracy, ultra-low current, and dual-monitoring capability in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage for MAX6344SUT+T?
The MAX6344SUT+T has a factory-trimmed VCC reset threshold of 2.93V, with guaranteed tolerance of ±25mV over the full -40°C to +125°C operating temperature range. This value is laser-trimmed during production and specified in Maxim's Selector Guide 2. The 'S' suffix in MAX6344SUT+T explicitly denotes the 2.93V variant, and the threshold is confirmed in the Electrical Characteristics table on page 2 of the datasheet.
Does MAX6344SUT+T require an external pull-up resistor on its RESET pin?
No, MAX6344SUT+T does not require an external pull-up resistor because it features an active-high push-pull RESET output. Unlike open-drain variants (e.g., MAX6343SUT+T), the MAX6344SUT+T actively drives high during normal operation and pulls low during reset - eliminating dependency on external biasing and reducing BOM count. This is explicitly stated in the Pin Description and Typical Operating Circuit sections.
How is the power-fail warning function implemented in MAX6344SUT+T?
The MAX6344SUT+T implements power-fail warning via its dedicated PFI (Power-Fail Input) and PFO (Power-Fail Output) pins. PFI connects to an external voltage divider; when the divided voltage falls below the internal 1.25V reference, PFO asserts low. This signal is independent of the main reset function and can be used to trigger µP interrupts or initiate controlled shutdown - detailed in the Applications Information section on page 5.
What is the minimum reset pulse width guaranteed for MAX6344SUT+T?
The MAX6344SUT+T guarantees a minimum reset pulse width of 100ms after VCC rises above the 2.93V threshold or after the MR input transitions from low to high. This timeout period (tRP) is production-tested and specified across -40°C to +85°C (100ms min) and -40°C to +125°C (80ms min), ensuring sufficient time for µP initialization and peripheral stabilization before release.
Can MAX6344SUT+T operate reliably at VCC = +1.0V?
Yes, MAX6344SUT+T is guaranteed to assert a valid logic-level RESET output down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures robust brownout detection even during deep undervoltage conditions - a key differentiator versus competitors that specify reset validity only down to 1.5V or higher.
MAX6344SUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6344SUT+T FAQ
1.How can I place an order for MAX6344SUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6344SUT+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 MAX6344SUT+T reliable?
The price and inventory of MAX6344SUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6344SUT+T is usually 5 days.
3.What payment methods are accepted for MAX6344SUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6344SUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6344SUT+T?
MAX6344SUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6344SUT+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 MAX6344SUT+T?
For technical support, including MAX6344SUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6344SUT+T requirements.
6.How does Aetrix verify that MAX6344SUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6344SUT+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 MAX6344SUT+T meets industry standards.
7.What is the process for return or replacement of MAX6344SUT+T?
All MAX6344SUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6344SUT+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 MAX6344SUT+T part is unused and in its original packaging.
Return procedure for MAX6344SUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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