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Analog Devices Inc./Maxim Integrated MAX6348UR33-T
- Part No.:
- MAX6348UR33-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6348UR33-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,560
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Product details
Overview
MAX6348UR33-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 3.3V power supplies and assert a reset signal during brownout, power-up, or power-down events. It features a factory-trimmed 3.30V 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 MAX6348UR33-T datasheet, MAX6348UR33-T pinout, MAX6348UR33-T application, or MAX6348UR33-T equivalent, key selection criteria include open-drain output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), transient immunity against fast VCC glitches, guaranteed reset state down to 1V, and SOT23-3 footprint suitability for space-constrained embedded designs.
Technical Context
The MAX6348UR33-T implements a precision bandgap-based reset comparator with 40ppm/°C temperature coefficient and 9.5mV hysteresis to prevent chatter near threshold. Its open-drain RESET output requires an external pull-up and supports wired-OR configurations with other reset sources.
It asserts reset when VCC falls below 3.30V and holds it for ≥100ms after VCC rises above threshold - a timing function fully specified across -40°C to +85°C. The device ignores transients ≤20µs at 100mV overdrive, enabling robust operation in noisy power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.30V (±1.5% at +25°C); ensures reliable detection of 3.3V supply droop before system instability |
| Reset Timeout | 100–280ms; guarantees sufficient hold time for µP initialization after power recovery |
| Supply Current | ≤1.0µA at 3V; enables multi-year battery life in always-on portable instrumentation |
| Operating Voltage Range | 1.2V to 5.5V; supports valid reset assertion even during deep brownout or partial power loss |
| Output Type | Open-drain RESET; allows direct interface to bidirectional µP reset pins and shared reset buses |
| Tempco | 40ppm/°C; limits threshold drift to <±27mV over full -40°C to +85°C range |
| VCC Transient Immunity | Rejects ≤20µs negative glitches at 100mV overdrive; prevents false resets in electrically noisy systems |
Pinout & Package
MAX6348UR33-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.
| 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 | Drives low during reset; requires external pull-up to VCC or another rail; supports wired-OR reset arbitration |
| 3 (VCC) | Supply input | Power source and monitored voltage rail; internally decoupled; accepts 1.2V–5.5V with full functionality |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Extends battery runtime in handheld meters and remote sensors without compromising reset reliability |
| Factory-trimmed 3.30V threshold | Eliminates external resistor networks or calibration; reduces BOM count and assembly cost |
| 100ms minimum reset timeout | Meets JEDEC JESD82-20 requirement for µP power-on initialization timing |
| Open-drain output architecture | Enables seamless integration with legacy µPs having bidirectional reset pins (e.g., 68HC11) via single pull-up |
| Guaranteed operation down to 1V VCC | Ensures deterministic reset state during severe brownout, preventing undefined µP behavior |
Applications
| Handheld Test Instruments | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered multimeters and oscilloscopes require stable reset during intermittent battery contact or low-voltage cutoff. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to microcontroller upon 3.3V rail collapse, holding for ≥100ms post-recovery. Use Value: Prevents corrupted ADC readings or display artifacts by ensuring full µP reset before firmware execution resumes. | Use Scenario: DIN-rail mounted I/O modules operate in electrically noisy factory environments with frequent 24V supply transients coupling into 3.3V logic rails. IC Role / Device Role / Timing Role: Open-drain RESET output interfaces directly to µP's bidirectional reset pin, sharing bus with watchdog and external emergency stop signals. Use Value: Transient immunity rejects sub-20µs noise spikes, eliminating spurious resets that would disrupt real-time I/O scanning cycles. |
| Medical Wearable Sensors | Smart Energy Meters |
Use Scenario: ECG patch monitors use coin-cell batteries; voltage sags occur during RF transmission bursts, risking µP lockup. IC Role / Device Role / Timing Role: Monitors dedicated 3.3V LDO output; asserts reset if VCC drops below 3.30V, with hysteresis preventing oscillation near threshold. Use Value: 40ppm/°C tempco ensures consistent trip point across body-temperature variations (32–40°C), maintaining clinical data integrity. | Use Scenario: Meters experience wide ambient temperature swings (-25°C to +70°C) and must retain accurate timekeeping and metrology during AC mains dips. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection for the metrology SoC; operates reliably from 1.2V to guarantee reset assertion even during deep brownout. Use Value: Guaranteed reset state down to 1V prevents flash corruption or register misconfiguration during extended low-VCC conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2-T | Push-pull active-low RESET; 3.08V threshold; 1.2µA max ICC; same SOT23-3 package | Requires no pull-up resistor but cannot share reset bus; less suitable for bidirectional µP interfaces | Select when board layout lacks space for pull-up or when only single-source reset is needed |
| TPS3808G33DBVR | Open-drain active-low RESET; 3.3V threshold; 1.1µA max ICC; 6-pin SOT23 package with manual reset input | Includes MR pin for external reset initiation; larger footprint adds routing complexity | Select when system-level fault recovery requires software-triggered reset in addition to power monitoring |
Compared with MAX809TRD2-T and TPS3808G33DBVR, the MAX6348UR33-T uniquely balances ultra-low ICC (≤1µA), open-drain flexibility for shared reset buses, and minimal 3-pin SOT23 footprint - making it optimal for space- and power-constrained portable designs where bidirectional µP reset support is required.
Availability
MAX6348UR33-T is available at Aetrix Electronics and suitable for handheld test instruments, industrial PLC I/O modules, medical wearable sensors, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6348UR33-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 is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, connectivity, and security applications.
The MAX63xx family delivers ultra-low-power, precision voltage supervision for microprocessor-based systems - engineered specifically for battery-operated, space-constrained, and thermally demanding embedded applications.
FAQ
What is the exact reset threshold voltage of MAX6348UR33-T and how tightly is it specified?
The MAX6348UR33-T has a factory-trimmed nominal reset threshold of 3.30V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range of -40°C to +85°C. This specification is guaranteed by production testing per the Electrical Characteristics table in the official datasheet, and the device uses internal bandgap referencing to maintain accuracy without external components.
Does MAX6348UR33-T support operation at VCC voltages below 3.3V, and what is its minimum functional supply voltage?
Yes, MAX6348UR33-T remains fully functional and guarantees correct reset assertion down to VCC = 1.2V over temperature, and maintains defined logic states down to 1.0V. This allows reliable brownout detection even during severe supply sag - critical for preserving system integrity in portable equipment powered by depleting batteries.
What is the purpose of the open-drain output on MAX6348UR33-T, and how should it be connected?
The open-drain RESET output on MAX6348UR33-T requires an external pull-up resistor to VCC or another logic rail. This architecture enables wired-OR connection with other reset sources (e.g., watchdog timers or manual reset buttons) and direct interfacing with microprocessors featuring bidirectional reset pins like the Motorola 68HC11 - a capability push-pull supervisors lack.
How does MAX6348UR33-T handle fast voltage transients on the VCC line?
MAX6348UR33-T incorporates built-in transient immunity: it ignores negative-going VCC glitches ≤20µs in duration when the overdrive (VTH – VCC) is 100mV. This is achieved via internal filtering and comparator hysteresis (9.5mV), preventing false resets caused by switching noise or ESD-induced supply disturbances without requiring external RC networks.
Is MAX6348UR33-T pin-compatible with older Maxim reset supervisors such as MAX809?
No, MAX6348UR33-T is not pin-compatible with MAX809. While both use SOT23-3 packages, MAX809 has push-pull output and different pin assignments (VCC–GND–RESET vs. VCC–RESET–GND). MAX6348UR33-T follows the MAX6328/MAX6348 pinout: Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC - confirmed in the Pin Configuration diagram and Absolute Maximum Ratings table of the datasheet.
MAX6348UR33-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:
- 3.3V
- 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
MAX6348UR33-T FAQ
1.How can I place an order for MAX6348UR33-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348UR33-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 MAX6348UR33-T reliable?
The price and inventory of MAX6348UR33-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348UR33-T is usually 5 days.
3.What payment methods are accepted for MAX6348UR33-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348UR33-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348UR33-T?
MAX6348UR33-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348UR33-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 MAX6348UR33-T?
For technical support, including MAX6348UR33-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348UR33-T requirements.
6.How does Aetrix verify that MAX6348UR33-T is sourced from the original manufacturer or authorized distributors?
All MAX6348UR33-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 MAX6348UR33-T meets industry standards.
7.What is the process for return or replacement of MAX6348UR33-T?
All MAX6348UR33-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348UR33-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 MAX6348UR33-T part is unused and in its original packaging.
Return procedure for MAX6348UR33-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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