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Analog Devices Inc./Maxim Integrated MAX6348UR45-T
- Part No.:
- MAX6348UR45-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6348UR45-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,333
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Product details
Overview
MAX6348UR45-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.5V power supplies and assert reset during brownout or power-up/down events. It features a factory-trimmed 4.500V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset assertion.
For engineers reviewing the MAX6348UR45-T datasheet, MAX6348UR45-T pinout, MAX6348UR45-T application, or MAX6348UR45-T equivalent, key selection criteria include open-drain output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), transient immunity up to 200µs at 200mV overdrive, guaranteed state down to 1V VCC, and SOT23-3 package footprint constraints.
Technical Context
The MAX6348UR45-T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC drops below its 4.500V threshold. Its internal timing circuit ensures a minimum 100ms reset pulse width after VCC recovers, independent of temperature (fully specified from -40°C to +85°C).
As an open-drain device, it requires an external pull-up resistor for logic-level compatibility and supports bidirectional reset interfaces. Its 1µA max ICC enables use in always-on battery-backed subsystems, and its 40ppm/°C tempco ensures stable threshold performance across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V ±1.5% at +25°C; guarantees reliable detection of 4.5V supply collapse before system malfunction |
| Reset Timeout | 100ms min after VCC rise; ensures µP completes full initialization before release |
| Supply Current | 1µA max at VCC = 3V; enables multi-year operation on coin-cell batteries |
| Output Type | Open-drain active-low; allows wired-OR configuration and interface with bidirectional µP reset pins |
| VCC Operating Range | 1.2V to 5.5V; maintains valid reset state even during deep brownout or partial power loss |
| Tempco | 40ppm/°C; limits threshold drift to <±117mV over -40°C to +85°C |
| Hysteresis | 9.5mV; prevents chatter during slow VCC recovery near threshold |
Pinout & Package
MAX6348UR45-T is housed in a 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance to ensure accurate threshold sensing |
| 2 (RESET) | Active-low open-drain output | Sinks current when asserted; requires external pull-up to VCC or another logic rail for level translation |
| 3 (VCC) | Power supply input | Monitored voltage source; powers internal circuitry and defines reset assertion boundary |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 1µA max enables integration into energy-harvesting and long-life battery systems without measurable drain |
| Factory-trimmed precision threshold | 4.500V ±1.5% eliminates need for external calibration or trimming components |
| Transient immunity | Rejects VCC glitches ≤200µs at 200mV overdrive, preventing false resets in noisy power environments |
| Guaranteed operation down to 1V VCC | Ensures correct reset state during deep undervoltage conditions where other supervisors fail |
| Open-drain output architecture | Supports flexible voltage translation and shared-bus reset arbitration in multi-rail systems |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch operating from single CR2032 battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 4.5V LDO output powering MCU and analog front-end; asserts reset if battery sags below 4.5V during peak transmit current. Use Value: 1µA quiescent current extends battery life beyond 2 years; open-drain output interfaces directly with MCU's bidirectional reset pin without level-shifter. | Use Scenario: DIN-rail mounted I/O module with isolated 4.5V auxiliary supply for digital inputs. IC Role / Device Role / Timing Role: Monitors isolated 4.5V rail feeding FPGA configuration logic; holds reset until rail stabilizes post-power-up and remains asserted during line transients. Use Value: 100ms timeout exceeds FPGA configuration time; 40ppm/°C tempco ensures reliability across -40°C to +85°C ambient range. |
| Smart Meter Communication Units | Automotive Body Control Modules |
Use Scenario: NB-IoT modem section powered by 4.5V buck converter, subject to grid-induced transients. IC Role / Device Role / Timing Role: Detects brownout on 4.5V rail during AC mains dips; asserts open-drain reset to modem SoC and retains state for ≥100ms after recovery. Use Value: 9.5mV hysteresis prevents oscillation during slow VCC recovery; 200µs glitch rejection avoids spurious resets from switching noise. | Use Scenario: Low-power wake-up controller in BCM that monitors 4.5V always-on rail derived from vehicle battery. IC Role / Device Role / Timing Role: Provides fail-safe reset to microcontroller during cold-crank (battery dip to 6V) or load-dump events affecting 4.5V regulation. Use Value: Guaranteed operation down to 1.2V VCC ensures reset assertion integrity even during severe undervoltage; SOT23-3 footprint fits tight space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328UR45-T | Same 4.5V threshold, identical SOT23-3 package and open-drain output, but rated only for 0°C to +70°C industrial range | Limited to commercial-temperature applications; not qualified for extended industrial (-40°C to +85°C) operation | Select MAX6328UR45-T only if ambient operating temperature stays above -40°C and cost sensitivity outweighs temperature margin |
| TPS3808G33DBVR | 3.3V fixed threshold, push-pull output, 1.6µA typical ICC, same SOT23-3 package | Not suitable for 4.5V monitoring; requires redesign of reset logic due to active-high push-pull output | Choose only if system uses 3.3V supply and board layout permits output polarity change and higher quiescent current |
Compared with MAX6328UR45-T, the MAX6348UR45-T provides guaranteed -40°C to +85°C operation and tighter production testing; versus TPS3808G33DBVR, it delivers precise 4.5V monitoring, lower max ICC, and open-drain flexibility-critical for bidirectional reset architectures.
Availability
MAX6348UR45-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6348UR45-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, mixed-signal, and power management ICs for industrial, computing, communications, and consumer applications.
The MAX63xx family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for reliable reset generation in battery-powered and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6348UR45-T and how tightly is it specified?
The MAX6348UR45-T has a nominal reset threshold of 4.500V, factory-trimmed with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This specification is guaranteed per datasheet Electrical Characteristics table and applies directly to the MAX6348UR45-T, not inferred from family data.
Does MAX6348UR45-T support operation during deep brownout conditions?
Yes, MAX6348UR45-T is guaranteed to maintain correct reset state for VCC down to 1.2V over temperature and functions reliably down to 1.0V at 0°C to +70°C. Its internal circuitry remains fully operational and asserts reset as long as VCC remains below 4.500V, making it suitable for deep undervoltage supervision.
What is the required external component for MAX6348UR45-T's open-drain RESET output?
The MAX6348UR45-T's pin 2 (RESET) is an open-drain output and requires an external pull-up resistor to a logic rail (e.g., VCC or another supply). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements; no other external components are needed for basic reset functionality.
How does MAX6348UR45-T handle fast transients on the VCC line?
MAX6348UR45-T rejects negative-going VCC transients up to 200µs duration when the overdrive (VTH – VCC) is 200mV, as shown in the Typical Operating Characteristics graph. This transient immunity prevents false resets caused by switching noise or coupling spikes, a design feature confirmed for the MAX6348UR45-T in the official datasheet.
Is MAX6348UR45-T pin-compatible with legacy Maxim reset supervisors like MAX809?
Yes, MAX6348UR45-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, MAX6348UR45-T offers improved specs: lower ICC (1µA vs. 20µA), tighter threshold accuracy, and enhanced transient immunity - all verified for the MAX6348UR45-T in the datasheet Selector Guide.
MAX6348UR45-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.5V
- 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
MAX6348UR45-T FAQ
1.How can I place an order for MAX6348UR45-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348UR45-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 MAX6348UR45-T reliable?
The price and inventory of MAX6348UR45-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348UR45-T is usually 5 days.
3.What payment methods are accepted for MAX6348UR45-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348UR45-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348UR45-T?
MAX6348UR45-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348UR45-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 MAX6348UR45-T?
For technical support, including MAX6348UR45-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348UR45-T requirements.
6.How does Aetrix verify that MAX6348UR45-T is sourced from the original manufacturer or authorized distributors?
All MAX6348UR45-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 MAX6348UR45-T meets industry standards.
7.What is the process for return or replacement of MAX6348UR45-T?
All MAX6348UR45-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348UR45-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 MAX6348UR45-T part is unused and in its original packaging.
Return procedure for MAX6348UR45-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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