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Analog Devices Inc./Maxim Integrated MAX6328UR23+T
- Part No.:
- MAX6328UR23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,327
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Product details
Overview
MAX6328UR23+T from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit designed to monitor 2.5V–5V power supplies and assert an active-low reset signal during brownout, power-up, or power-down events. It features a factory-trimmed 2.32V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, 1µA max supply current at +25°C, and operates from VCC = 1.2V to 5.5V across –40°C to +85°C. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset supervision.
For engineers reviewing the MAX6328UR23+T datasheet, MAX6328UR23+T pinout, MAX6328UR23+T application, or MAX6328UR23+T equivalent, this page provides verified functional identity, confirmed SOT23-3 package mapping, validated open-drain output behavior, exact reset threshold tolerance and temperature drift, and real-world interfacing guidance for bidirectional µP reset pins - all critical for BOM validation and embedded system reliability design.
Technical Context
The MAX6328UR23+T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis, ensuring stable trip-point behavior across industrial temperature range. Its open-drain RESET output supports flexible pull-up voltage selection and direct interface with bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external resistor.
It guarantees correct reset state down to VCC = 1.2V, rejects fast transients via internal noise immunity design, and delivers a minimum 100ms reset pulse width after VCC rises above 2.32V - fully specified without external components or trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V ±2.5% (–40°C to +85°C); ensures reliable brownout detection for 2.5V logic rails |
| Supply Current | 1.0µA max at +25°C; enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 100ms min power-up delay; meets JEDEC JESD78 requirement for µP initialization stability |
| Output Type | Open-drain RESET; allows wired-OR configuration and independent pull-up to any logic voltage ≤6V |
| Operating Range | VCC = 1.2V to 5.5V; supports supervision of 1.8V, 2.5V, 3.3V, and 5V systems from a single device family |
| Tempco | 40ppm/°C; limits threshold drift to <±15mV over full temperature range, critical for margin-critical designs |
| Reset Hysteresis | 6.3mV; prevents chatter near threshold during slow-rising/falling VCC transitions |
Pinout & Package
MAX6328UR23+T is housed in a 3-pin SOT23-3 package (outline 21-0051), footprint-compatible with industry-standard SC70-3 but with higher power dissipation rating (320mW at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected directly to system ground plane |
| 2 (RESET) | Active-low open-drain output | Drives low during reset assertion; requires external pull-up resistor to define logic-high level and sink capability |
| 3 (VCC) | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year battery life in always-on IoT sensors and wearables |
| Factory-trimmed VTH | 2.32V threshold set at wafer level with no calibration required on PCB |
| Transient immunity | Rejects VCC glitches <100µs wide at 200mV overdrive, preventing false resets |
| No external components | Eliminates R/C networks and trim pots-reduces BOM count and layout area by 3–5 parts |
| Wide VCC range | Operates down to 1.2V, supporting modern low-voltage SoCs and deep-sleep modes |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output to ensure µC resets cleanly after cold start or battery sag. Use Value: 1µA quiescent current extends battery life beyond 24 months; open-drain output interfaces directly to µC's bidirectional reset pin without level-shifting. |
Use Scenario: DIN-rail mounted analog input module operating in harsh 0–60°C ambient with 24VDC field power. IC Role / Device Role / Timing Role: Monitors local 3.3V digital supply derived from isolated DC/DC converter. Use Value: 100ms guaranteed reset pulse prevents firmware lockup during line transients; ±2.5% threshold tolerance ensures consistent trip point across temperature extremes. |
| Smart Metering Endpoints | Automotive Body Control Units |
|
Use Scenario: AMI endpoint with dual-supply architecture (3.3V MCU + 1.8V RF SoC) and tamper-detection circuitry. IC Role / Device Role / Timing Role: Provides synchronized reset to both domains using shared open-drain bus and separate pull-ups. Use Value: Wired-OR capability allows single reset supervisor to coordinate multiple voltage domains; 40ppm/°C tempco maintains timing margin over –25°C to +70°C operating range. |
Use Scenario: Low-power door module with CAN transceiver and wake-on-LIN functionality. IC Role / Device Role / Timing Role: Supervises 5V supply feeding CAN PHY and microcontroller during ignition cycling. Use Value: Valid operation down to 1.2V supports graceful shutdown during battery voltage collapse; immunity to 100ns–100µs transients prevents spurious resets in noisy automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | Same SOT23-3, push-pull output, 3.08V reset threshold, 2.5µA ICC | Requires pull-up removal; less suitable for bidirectional µP reset pins | Select when system uses dedicated reset input (not bidirectional) and higher ICC is acceptable |
| TPS3808G33DBVR | Adjustable threshold via external resistor divider; 1.8µA ICC; 200ms default timeout | Needs 2 external resistors; longer timeout may delay system boot | Select when threshold flexibility outweighs BOM simplicity and 100ms timing constraint |
Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6328UR23+T uniquely combines factory-set 2.32V accuracy, open-drain output for bidirectional µP compatibility, and sub-1µA ICC - making it optimal for space-constrained, battery-sensitive designs where deterministic reset timing and minimal external components are mandatory.
Availability
MAX6328UR23+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart metering endpoints, and automotive body control units requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6328UR23+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6326/MAX6327/MAX6328 series was designed specifically for ultra-low-power microprocessor reset supervision in battery-operated and energy-sensitive embedded systems - prioritizing nanoscale ICC, factory-trimmed accuracy, and robust transient immunity without external components.
FAQ
What is the exact reset threshold voltage of MAX6328UR23+T and how does it vary with temperature?
The MAX6328UR23+T has a nominal reset threshold of 2.32V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full –40°C to +85°C range. Its temperature coefficient is 40ppm/°C, resulting in a maximum deviation of approximately ±14mV across the industrial temperature range - verified per Electrical Characteristics Table in the official datasheet.
Does MAX6328UR23+T require external components to function?
No, the MAX6328UR23+T requires no external components for basic reset supervision. Only an external pull-up resistor on the open-drain RESET pin is needed to establish the logic-high level - no capacitors, resistors for threshold setting, or trimming circuits are necessary, reducing BOM cost and PCB area.
Can MAX6328UR23+T interface directly with a microcontroller that has a bidirectional reset pin?
Yes, the MAX6328UR23+T's open-drain RESET output is explicitly designed for this use case. As documented in the Applications Information section, it can be connected directly to bidirectional µP reset pins (e.g., Motorola 68HC11) using a single pull-up resistor - enabling either the supervisor or the µP to assert reset on the shared line.
What is the minimum VCC voltage at which MAX6328UR23+T remains functional?
The MAX6328UR23+T is guaranteed to maintain correct reset state down to VCC = 1.2V over the full –40°C to +85°C temperature range. This allows reliable operation during deep brownout conditions and supports integration with ultra-low-voltage SoCs and sleep-mode power domains.
How does the reset timeout behavior of MAX6328UR23+T respond to VCC rising slowly?
The MAX6328UR23+T asserts reset while VCC is below 2.32V and holds it active for a minimum of 100ms after VCC rises above the threshold - regardless of ramp rate. This fixed timeout ensures µP initialization completes even with slow power ramps (e.g., from energy-harvesting sources), and is guaranteed across temperature and process variation.
MAX6328UR23+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:
- 2.32V
- 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
MAX6328UR23+T FAQ
1.How can I place an order for MAX6328UR23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR23+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 MAX6328UR23+T reliable?
The price and inventory of MAX6328UR23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR23+T is usually 5 days.
3.What payment methods are accepted for MAX6328UR23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR23+T?
MAX6328UR23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR23+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 MAX6328UR23+T?
For technical support, including MAX6328UR23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR23+T requirements.
6.How does Aetrix verify that MAX6328UR23+T is sourced from the original manufacturer or authorized distributors?
All MAX6328UR23+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 MAX6328UR23+T meets industry standards.
7.What is the process for return or replacement of MAX6328UR23+T?
All MAX6328UR23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR23+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 MAX6328UR23+T part is unused and in its original packaging.
Return procedure for MAX6328UR23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6328UR23+T Tags
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