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Analog Devices Inc./Maxim Integrated MAX6328UR25
- Part No.:
- MAX6328UR25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR25.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
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Product details
Overview
MAX6328UR25 from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit designed to monitor 2.5V power supplies and assert an active-low reset signal during brownout, power-up, and power-down events. It features a factory-trimmed 2.500V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, 1µA max supply current at 3V, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-quiescent-power supply monitoring.
For engineers reviewing the MAX6328UR25 datasheet, MAX6328UR25 pinout, MAX6328UR25 application, or MAX6328UR25 equivalent, this page delivers verified electrical specifications, SOT23-3 package details, open-drain reset behavior, transient immunity characteristics, and validated alternative parts for µP reset circuit design and BOM optimization.
Technical Context
The MAX6328UR25 implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC falling below its 2.500V threshold and hold RESET low for ≥100ms after recovery. Its open-drain output enables direct interface with bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pull-up resistor.
It is fully specified from -40°C to +85°C, exhibits 40ppm/°C reset threshold tempco, rejects fast VCC transients (e.g., ≤20µs glitches at 100mV overdrive), and draws only 0.5–1.0µA typical supply current across its operating range - enabling use in energy-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.500V ±1.5% at +25°C; ensures reliable detection of 2.5V rail collapse before system instability |
| Supply Current | ≤1.0µA max at 3V; enables multi-year operation on coin-cell batteries in portable devices |
| Reset Timeout | 100–280ms min; guarantees sufficient reset assertion time for full µP initialization |
| Output Type | Open-drain active-low; supports wired-OR reset buses and bidirectional µP interfaces |
| VCC Operating Range | 1.2V to 5.5V; allows supervision of deeply scaled logic rails and legacy 5V systems |
| Tempco | 40ppm/°C; limits threshold drift to <±20mV over full -40°C to +85°C range |
| Hysteresis | 6.3mV; prevents chatter during slow VCC recovery near threshold |
Pinout & Package
MAX6328UR25 is housed in a 3-pin SOT23-3 package (outline U3-1), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and automated 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 rail; enables shared reset bus topology |
| 3 (VCC) | Supply input | Powers internal circuitry and defines monitored rail; accepts 1.2V–5.5V; internally decoupled |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max ensures negligible battery drain in always-on monitoring applications |
| Factory-trimmed VTH | 2.500V threshold eliminates external resistor networks and calibration effort |
| Transient immunity | Rejects ≤20µs negative VCC glitches at 100mV overdrive - avoids false resets in noisy environments |
| Wide VCC range | 1.2V–5.5V operation supports mixed-voltage systems and brownout detection down to ultralow rails |
| Guaranteed state at 1V | Internal logic remains valid down to 1V VCC - enables predictable reset assertion during deep undervoltage |
Applications
| Battery-Powered Portable Devices | Industrial Microcontroller Systems |
|---|---|
Use Scenario: Handheld test meters and wireless sensors powered by single Li-ion or coin cells. IC Role / Device Role / Timing Role: Supervises 2.5V system rail and asserts clean, glitch-free reset to MCU during battery voltage sag or cold start. Use Value: 1µA max ICC extends battery life beyond 5 years; open-drain output simplifies integration with existing reset bus architecture. | Use Scenario: Programmable logic controllers (PLCs) and remote I/O modules deployed in factory automation. IC Role / Device Role / Timing Role: Monitors 2.5V FPGA configuration or communication IC supply and holds processor in reset until stable. Use Value: 100ms guaranteed timeout ensures full FPGA configuration completion; -40°C to +85°C rating matches industrial ambient requirements. |
| Medical Diagnostic Equipment | Automotive Body Control Modules |
Use Scenario: Portable ultrasound and glucose monitors requiring FDA-grade reliability and low power. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision for ARM Cortex-M based host processors running critical firmware. Use Value: Factory-trimmed 2.500V threshold eliminates calibration drift; 40ppm/°C tempco ensures accuracy across clinical temperature ranges. | Use Scenario: In-vehicle infotainment and lighting control units exposed to automotive thermal cycling. IC Role / Device Role / Timing Role: Guards 2.5V microcontroller core voltage against load-dump-induced sags and ignition transients. Use Value: Immunity to fast VCC transients prevents spurious resets during engine cranking; SOT23-3 package withstands reflow and vibration stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2-T | Push-pull active-low output; same 2.5V threshold and SOT23-3 package; 1.2µA max ICC | Requires no external pull-up; unsuitable for wired-OR or bidirectional reset buses | Select when board-level reset signaling is point-to-point and layout simplicity is prioritized over bus sharing |
| TPS3808G25DBVR | Adjustable threshold via external resistor divider; 1.6µA max ICC; 200ms fixed timeout | Enables custom reset voltages but adds component count and layout area; less precise than factory-trimmed part | Select when non-standard threshold (e.g., 2.48V) or programmability is required, and extra BOM cost is acceptable |
Compared with MAX809TRD2-T, MAX6328UR25 offers open-drain flexibility for shared reset domains; compared with TPS3808G25DBVR, it delivers higher accuracy and lower quiescent current without external components - making it optimal for space- and power-constrained 2.5V systems.
Availability
MAX6328UR25 is available at Aetrix Electronics and suitable for portable medical devices, industrial controllers, battery-powered instrumentation, and automotive body electronics requiring stable component supply and long-term manufacturability.
Supply support for MAX6328UR25 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 demanding industrial, medical, and communications applications.
The MAX6326/MAX6327/MAX6328 family delivers ultra-low-power, factory-trimmed µP supervisors optimized for reliable reset generation in battery-critical and thermally harsh embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6328UR25 and how tightly is it specified?
The MAX6328UR25 has a factory-trimmed nominal reset threshold of 2.500V. At +25°C, this is guaranteed within ±1.5% (2.462V to 2.537V); over the full -40°C to +85°C operating range, it is specified as ±2.5% (2.437V to 2.562V). This precision eliminates need for external calibration and ensures consistent brownout detection across temperature.
Does MAX6328UR25 require an external pull-up resistor on its RESET pin?
Yes, MAX6328UR25 features an open-drain active-low RESET output and requires an external pull-up resistor to VCC or another appropriate rail. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and sink current requirements. This configuration enables wired-OR reset bus topologies and compatibility with bidirectional µP reset pins.
Can MAX6328UR25 operate reliably below 2.5V VCC?
Yes, MAX6328UR25 is fully functional down to 1.2V VCC over temperature and guaranteed to maintain correct reset state down to 1.0V. Its internal circuitry remains valid and the RESET output behaves predictably even during deep brownout conditions - a key advantage for low-voltage portable systems.
How does MAX6328UR25 handle fast power-supply transients?
MAX6328UR25 is designed to ignore fast negative-going VCC transients. For example, at 100mV overdrive (i.e., VCC = 2.400V when VTH = 2.500V), it tolerates transients up to ~20µs without asserting reset. This immunity prevents false resets in electrically noisy environments such as motor drives or switching power supplies.
Is MAX6328UR25 pin-compatible with other members of the MAX632x family?
Yes, MAX6328UR25 shares identical SOT23-3 pinout (GND, RESET, VCC) and footprint with all MAX6326/MAX6327/MAX6328 variants. However, output type differs: MAX6328UR25 is open-drain, while MAX6326UR25 is push-pull. Swapping requires verifying downstream reset bus topology and pull-up requirements before substitution.
MAX6328UR25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.5V
- 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
MAX6328UR25 FAQ
1.How can I place an order for MAX6328UR25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR25 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 MAX6328UR25 reliable?
The price and inventory of MAX6328UR25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR25 is usually 5 days.
3.What payment methods are accepted for MAX6328UR25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR25?
MAX6328UR25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR25 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 MAX6328UR25?
For technical support, including MAX6328UR25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR25 requirements.
6.How does Aetrix verify that MAX6328UR25 is sourced from the original manufacturer or authorized distributors?
All MAX6328UR25 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 MAX6328UR25 meets industry standards.
7.What is the process for return or replacement of MAX6328UR25?
All MAX6328UR25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR25, 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 MAX6328UR25 part is unused and in its original packaging.
Return procedure for MAX6328UR25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6328UR25 Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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V6340RSP3B+
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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