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Analog Devices Inc./Maxim Integrated MAX6348UR44+T
- Part No.:
- MAX6348UR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6348UR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,399
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Product details
Overview
MAX6348UR44+T from Maxim Integrated is an ultra-low-power, open-drain, active-low microprocessor supervisory circuit designed to monitor 4.38V power supplies in embedded systems. It asserts reset when VCC falls below 4.38V (±2.5% over temperature), maintains reset for ≥100ms after recovery, operates down to 1.2V VCC, consumes ≤1µA supply current, and is housed in a 3-pin SOT23 package for space-constrained portable applications.
For engineers reviewing the MAX6348UR44+T datasheet, MAX6348UR44+T pinout, MAX6348UR44+T application, or MAX6348UR44+T equivalent, this page delivers verified electrical behavior, precise reset threshold tolerance, open-drain output design implications, thermal stability data, and direct alternatives for brownout protection in battery-powered µP systems.
Technical Context
The MAX6348UR44+T implements a precision bandgap-based voltage comparator with factory-trimmed 4.38V reset threshold (±1.5% at +25°C, ±2.5% over −40°C to +85°C) and 9.5mV hysteresis. Its open-drain RESET output requires an external pull-up and supports bidirectional µP reset interfaces like the Motorola 68HC11.
It features transient immunity up to 100V/µs dV/dt on VCC, guarantees correct state down to 1.2V VCC, and delivers a minimum 100ms power-on reset timeout - fully specified across industrial temperature range without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (±2.5% over −40°C to +85°C); ensures reliable brownout detection for 4.5V nominal rails |
| Supply Current | ≤1.0µA at +25°C; enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 100ms to 280ms min–max; meets JEDEC JESD78 latch-up immunity timing requirements |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration and interface with bidirectional µP reset pins |
| VCC Operating Range | 1.2V to 5.5V; supports valid reset assertion during deep brownout and full rail operation |
| Temperature Range | −40°C to +85°C; qualified for industrial-grade embedded control and instrumentation |
| Package | SOT23-3; 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6348UR44+T is supplied in a 3-pin SOT23-3 package (outline U3-1, land pattern 90-0179), with gull-wing leads, RoHS-compliant lead-free finish (+T suffix), and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Open-drain active-low reset output; requires external pull-up resistor (typically 10kΩ) to VCC or another logic rail |
| 3 | VCC | Power supply input; monitors this rail for undervoltage; accepts 1.2V–5.5V with guaranteed functionality |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | ≤1.0µA max at +25°C - extends battery life in always-on monitoring nodes |
| Factory-trimmed VTH | 4.38V with ±2.5% tolerance over full temperature range - eliminates manual calibration |
| Transient immunity | Immune to VCC glitches <100µs wide at 200mV overdrive - prevents false resets in noisy environments |
| No external components | Self-contained reset generation - reduces BOM count and layout area vs. discrete RC solutions |
| Open-drain flexibility | Enables shared reset bus across multiple ICs and compatibility with µPs requiring bidirectional reset control |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
Use Scenario: Power monitoring during cold-start and battery sag in DIN-rail mounted I/O modules. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU until 4.38V rail stabilizes. Use Value: Prevents firmware execution under marginal VCC by enforcing ≥100ms reset hold time post-brownout recovery. |
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Open-drain RESET output pulled up to 3.3V logic rail, coordinating reset with BLE SoC's bidirectional reset pin. Use Value: Enables single-wire reset arbitration between sensor ASIC and radio SoC without additional logic or level shifters. |
| Smart Energy Meters | Automated Test Equipment (ATE) |
Use Scenario: AC/DC-powered meter experiencing line sags and fast transients during grid switching events. IC Role / Device Role / Timing Role: Voltage supervisor detecting dips below 4.38V on 5V system rail and holding µP in reset. Use Value: Guarantees clean boot after transient-induced brownout using 9.5mV hysteresis to prevent chatter near threshold. |
Use Scenario: High-precision ATE fixture requiring deterministic power-on sequencing across FPGA, ADC, and DAC subsystems. IC Role / Device Role / Timing Role: Primary reset generator with 100ms minimum timeout ensuring all peripherals initialize before FPGA configuration completes. Use Value: Eliminates need for external RC timing network while maintaining JEDEC-compliant reset duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328UR44+T | Same 4.38V threshold, same SOT23-3 package, but rated only for 0°C to +70°C industrial range | Limited to commercial-temperature applications; not suitable for extended industrial deployments | Select MAX6328UR44+T only if ambient operating temperature stays within 0°C–70°C and cost is prioritized over temperature margin |
| TPS3808G33DBVR | 4.38V threshold (±0.5% initial accuracy), push-pull output, 1.6µA typical ICC, 2% tempco | Push-pull output requires no pull-up; tighter initial accuracy but higher supply current than MAX6348UR44+T | Choose TPS3808G33DBVR when board space permits larger SOT23-5 and push-pull drive simplifies routing |
Compared with MAX6328UR44+T, the MAX6348UR44+T provides extended −40°C to +85°C operation and identical open-drain functionality; versus TPS3808G33DBVR, it trades tighter accuracy and push-pull convenience for lower quiescent current and proven transient immunity in legacy designs.
Availability
MAX6348UR44+T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical sensors, smart energy meters, automated test equipment, and battery-backed real-time clocks requiring stable component supply with long-lifecycle support.
Supply support for MAX6348UR44+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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX63xx family was engineered specifically for ultra-low-power, high-reliability microprocessor reset supervision in space- and energy-constrained systems - emphasizing precision threshold stability, minimal external dependencies, and robust noise immunity.
FAQ
What is the exact reset threshold voltage of MAX6348UR44+T and its tolerance over temperature?
The MAX6348UR44+T has a nominal reset threshold of 4.38V, with ±1.5% tolerance at +25°C and ±2.5% tolerance across the full −40°C to +85°C operating range. This specification is factory-trimmed and guaranteed per the Electrical Characteristics table in the official datasheet, ensuring consistent brownout detection for 4.5V nominal power rails.
Does MAX6348UR44+T require an external pull-up resistor on the RESET pin?
Yes, MAX6348UR44+T features an open-drain RESET output and requires an external pull-up resistor - typically 4.7kΩ to 10kΩ - connected between the RESET pin and the target logic rail (e.g., VCC or 3.3V). This configuration enables wired-OR reset buses and compatibility with microprocessors having bidirectional reset pins, such as the Motorola 68HC11.
What is the minimum VCC voltage at which MAX6348UR44+T remains functional?
MAX6348UR44+T is guaranteed to maintain correct reset state down to VCC = 1.2V across the full −40°C to +85°C temperature range. Below 1.2V, the device may not assert or release reset reliably; however, its 1.2V lower limit supports operation during deep brownout conditions where other supervisors fail.
How does the reset timeout duration of MAX6348UR44+T vary with temperature?
The reset timeout (power-up reset pulse width) of MAX6348UR44+T ranges from 100ms (minimum) to 280ms (maximum) across temperature. The Typical Operating Characteristics graph "POWER-UP RESET TIMEOUT vs. TEMPERATURE" shows monotonic increase from ~140ms at −40°C to ~210ms at +85°C, with 100ms guaranteed minimum at all temperatures.
Is MAX6348UR44+T pin-compatible with older Maxim reset ICs like MAX809?
Yes, MAX6348UR44+T is pin-compatible with MAX809 in the SOT23-3 package - sharing identical pin 1 (GND), pin 2 (RESET), and pin 3 (VCC) assignments. However, MAX6348UR44+T offers improved specs: lower supply current (1µA vs. 20µA), tighter threshold tolerance (±2.5% vs. ±2.8%), and enhanced transient immunity, making it a direct functional upgrade.
MAX6348UR44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6348UR44+T FAQ
1.How can I place an order for MAX6348UR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348UR44+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 MAX6348UR44+T reliable?
The price and inventory of MAX6348UR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348UR44+T is usually 5 days.
3.What payment methods are accepted for MAX6348UR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348UR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348UR44+T?
MAX6348UR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348UR44+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 MAX6348UR44+T?
For technical support, including MAX6348UR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348UR44+T requirements.
6.How does Aetrix verify that MAX6348UR44+T is sourced from the original manufacturer or authorized distributors?
All MAX6348UR44+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 MAX6348UR44+T meets industry standards.
7.What is the process for return or replacement of MAX6348UR44+T?
All MAX6348UR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348UR44+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 MAX6348UR44+T part is unused and in its original packaging.
Return procedure for MAX6348UR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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