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Analog Devices Inc./Maxim Integrated MAX6328UR28+T
- Part No.:
- MAX6328UR28+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR28+T.pdf
- Description:
- IC MPU/RESET CIRC 2.80V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
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Product details
Overview
MAX6328UR28+T from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit designed to monitor VCC supply voltage and assert an active-low reset signal during power-up, brownout, or power-down events. It features a factory-trimmed 2.80V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, 1µA maximum supply current at 3V, and operates from 1.2V to 5.5V. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset supervision.
For engineers reviewing the MAX6328UR28+T datasheet, MAX6328UR28+T pinout, MAX6328UR28+T application, or MAX6328UR28+T equivalent, this page delivers verified electrical parameters, SOT23-3 package details, open-drain output behavior, transient immunity specs, and direct alternatives for µP reset circuit design and BOM replacement.
Technical Context
The MAX6328UR28+T implements a precision bandgap-based reset comparator with built-in hysteresis (6.3mV) and internal timing capacitor to guarantee ≥100ms reset assertion after VCC recovery. Its open-drain RESET output enables wired-OR configuration and direct interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pull-up resistor.
It rejects fast VCC transients up to 100V/µs slew rate and maintains valid reset state down to VCC = 1.2V. The device requires no external components, is fully specified across -40°C to +85°C, and achieves ultra-low ICC ≤1.0µA (typical 0.5µA at 3V) - critical for battery longevity in portable instrumentation and embedded controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.80V ±1.5% (25°C), ±2.5% (-40°C to +85°C); ensures reliable reset assertion before system logic fails at 2.8V nominal supply. |
| Supply Current | ≤1.0µA max at 3V; enables multi-year operation on coin-cell batteries in always-on monitoring applications. |
| Reset Timeout | 100ms to 280ms min–max; guarantees sufficient hold time for µP initialization and peripheral stabilization. |
| VCC Operating Range | 1.2V to 5.5V; supports supervision of 2.5V, 3.0V, 3.3V, and 5.0V logic domains without external scaling. |
| Output Type | Open-drain RESET; allows flexible pull-up voltage selection and compatibility with mixed-voltage µP interfaces. |
| Transient Immunity | Rejects VCC glitches ≤200mV overdrive for durations up to 200µs (per typical curve); prevents false resets in noisy environments. |
| Reset Hysteresis | 6.3mV; provides noise margin to avoid oscillation near threshold during slow VCC ramp-up/down. |
Pinout & Package
MAX6328UR28+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), measuring 2.92mm × 1.3mm × 1.0mm, optimized for high-density PCB layouts in space-constrained portable designs.
| 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 for noise immunity. |
| 2 (RESET) | Active-low open-drain reset output | Drives low when VCC < 2.80V or during timeout; requires external pull-up resistor to define logic-high level and voltage domain. |
| 3 (VCC) | Supply input | Monitored power rail input; accepts 1.2V–5.5V; powers internal circuitry and defines reset threshold reference. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year battery life in coin-cell–powered IoT sensors and handheld meters. |
| Factory-trimmed VTH | 2.80V threshold set at wafer level with ±1.5% accuracy eliminates calibration overhead and reduces BOM count. |
| Open-drain output | Supports multi-source reset arbitration and interface to µPs with bidirectional reset pins (e.g., 68HC11) without level shifters. |
| No external components | Integrated timing capacitor and comparator eliminate discrete RC networks, reducing layout area and assembly cost. |
| Wide temperature range | Guaranteed operation from -40°C to +85°C ensures reliability in industrial controllers and automotive under-hood modules. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered ECG or glucose meter that must retain calibration and resume operation reliably after cold start or low-battery brownout. IC Role / Device Role / Timing Role: Supervises main 3.3V supply rail and asserts reset until stable; holds µC in reset for ≥100ms to ensure ADC reference settling and flash memory readiness. Use Value: 1µA quiescent current extends single-CR2032 battery life beyond 5 years; open-drain output interfaces cleanly with ARM Cortex-M0+ reset pin. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V-to-3.3V DC/DC converter powering its communication and I/O ASICs. IC Role / Device Role / Timing Role: Monitors post-regulation 3.3V rail; asserts reset during input undervoltage or converter startup delay to prevent firmware corruption. Use Value: 2.80V threshold aligns precisely with 3.3V LDO dropout margin; transient immunity prevents spurious resets from relay coil kickback noise. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: ANSI C12.20-certified electricity meter operating from split-phase 120/240V AC with auxiliary 3.3V backup supply. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection for metrology SoC; maintains reset until VCC stabilizes post-AC interruption. Use Value: Guaranteed function down to VCC = 1.2V allows supervision during deep brownouts; SOT23-3 footprint minimizes PCB area in sealed meter housing. |
Use Scenario: 12V-powered BCM managing door locks, lighting, and HVAC; subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises 5.0V domain powering CAN transceivers and microcontroller; asserts reset during cranking-induced dips below 2.8V. Use Value: 100mV hysteresis and 200µs glitch rejection prevent false resets during ISO 16750-2 pulse 4a/b events; lead-free +T suffix meets automotive RoHS requirements. |
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 | Same SOT23-3 package, 2.80V threshold, but push-pull output (not open-drain); 1.2µA max ICC. | Requires redesign if wired-OR reset bus or bidirectional µP interface is needed; unsuitable where pull-up voltage differs from VCC. | Select only when push-pull drive simplifies layout and no multi-source reset arbitration is required. |
| TPS3808G33DBVR | 2.93V threshold (not 2.80V), 1.8µA max ICC, open-drain output, same SOT23-3 footprint. | Higher threshold may cause premature reset release in 2.8V-margin systems; higher ICC reduces battery life in ultra-low-power apps. | Acceptable for non-critical 3.3V systems where 130mV higher VTH is tolerable and 0.8µA extra ICC is acceptable. |
Compared with MAX6328UR28+T, MAX809TRD2+T offers simpler drive but lacks open-drain flexibility, while TPS3808G33DBVR matches output type but shifts threshold upward and increases quiescent current - making MAX6328UR28+T optimal for precision 2.8V supervision in battery-sensitive designs.
Availability
MAX6328UR28+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6328UR28+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 family was designed specifically for ultra-low-power microprocessor reset supervision in battery-operated and space-constrained systems, emphasizing precision threshold accuracy, minimal ICC, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6328UR28+T and how tightly is it specified?
The MAX6328UR28+T has a factory-trimmed nominal reset threshold of 2.80V. At +25°C, this is guaranteed within ±1.5% (2.758V to 2.842V). Over the full operating temperature range of -40°C to +85°C, the threshold remains within ±2.5% (2.730V to 2.870V). This precision eliminates need for external adjustment and ensures consistent reset behavior across environmental conditions - a key requirement for MAX6328UR28+T deployment in certified medical and industrial equipment.
Does MAX6328UR28+T support operation at VCC below 2.8V, and what is its minimum functional supply voltage?
Yes, MAX6328UR28+T remains fully functional down to VCC = 1.2V across -40°C to +85°C. Its internal reset comparator and timing circuit maintain correct state (asserted or de-asserted) even when VCC drops below the 2.80V threshold - enabling reliable brownout detection and controlled shutdown. This capability is explicitly guaranteed in the datasheet and makes MAX6328UR28+T suitable for deep brownout scenarios where other supervisors may fail, such as in energy-harvesting or supercapacitor-backed systems.
What is the output configuration of MAX6328UR28+T, and why does it matter for system design?
MAX6328UR28+T features an active-low open-drain RESET output. This means the pin can only sink current (pull low) and requires an external pull-up resistor to define the high-state voltage. This configuration enables wired-OR reset buses, compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), and independent selection of pull-up voltage (e.g., 1.8V, 3.3V, or 5V) - unlike push-pull outputs. That flexibility is essential for MAX6328UR28+T integration into mixed-voltage systems without level translators.
How does MAX6328UR28+T handle fast voltage transients on the VCC line?
MAX6328UR28+T is designed to ignore fast negative-going VCC transients (glitches) up to 100V/µs slew rate. Its reset comparator incorporates inherent filtering, and typical operating characteristics show it rejects transients ≤200mV in amplitude for durations up to ~200µs - depending on overdrive. This immunity prevents false resets caused by switching noise, relay bounce, or ESD events, ensuring deterministic behavior in electrically noisy environments like industrial motor controls or automotive subsystems where MAX6328UR28+T is commonly deployed.
Is MAX6328UR28+T pin-compatible with legacy Maxim reset supervisors like MAX809?
MAX6328UR28+T shares the same 3-pin SOT23-3 package and pinout (GND, RESET, VCC) as MAX809-series devices, but it is not functionally pin-compatible due to its open-drain output versus MAX809's push-pull output. Direct substitution requires verifying that the target system's reset net can accommodate open-drain drive - including presence of a pull-up resistor and absence of conflicting push-pull drivers. Therefore, while physical layout is identical, circuit-level validation is required before replacing MAX809 with MAX6328UR28+T.
MAX6328UR28+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:
- 2.8V
- 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
MAX6328UR28+T FAQ
1.How can I place an order for MAX6328UR28+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR28+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 MAX6328UR28+T reliable?
The price and inventory of MAX6328UR28+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR28+T is usually 5 days.
3.What payment methods are accepted for MAX6328UR28+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR28+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR28+T?
MAX6328UR28+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR28+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 MAX6328UR28+T?
For technical support, including MAX6328UR28+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR28+T requirements.
6.How does Aetrix verify that MAX6328UR28+T is sourced from the original manufacturer or authorized distributors?
All MAX6328UR28+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 MAX6328UR28+T meets industry standards.
7.What is the process for return or replacement of MAX6328UR28+T?
All MAX6328UR28+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR28+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 MAX6328UR28+T part is unused and in its original packaging.
Return procedure for MAX6328UR28+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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