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Analog Devices Inc./Maxim Integrated MAX6328UR30+T
- Part No.:
- MAX6328UR30+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR30+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,055
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Product details
Overview
MAX6328UR30+T from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit that monitors 3.0V power supplies and asserts an active-low reset signal when VCC falls below 3.00V (±1.5% at +25°C), maintaining reset for ≥100ms after VCC recovers. It operates from 1.2V to 5.5V, draws ≤1.0µA supply current at 3V, and is housed in a 3-pin SOT23 package for space-constrained embedded systems.
For engineers reviewing the MAX6328UR30+T datasheet, MAX6328UR30+T pinout, MAX6328UR30+T application, or MAX6328UR30+T equivalent, this device serves as a precision brownout detector with transient immunity, open-drain flexibility for bidirectional µP reset interfaces, and factory-trimmed threshold stability across -40°C to +85°C.
Technical Context
The MAX6328UR30+T implements a precision bandgap-based voltage comparator with 2.5% temperature drift over -40°C to +85°C and 40ppm/°C tempco. Its reset timeout is guaranteed ≥100ms with typical value of 185ms and maximum of 280ms, independent of VCC slew rate.
As an open-drain RESET output device, it requires an external pull-up resistor and supports wired-OR configurations-enabling direct interface with µPs like the Motorola 68HC11 that feature bidirectional reset pins. The reset comparator ignores transients ≤20µs at 100mV overdrive, ensuring glitch immunity during noisy power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V ±1.5% at +25°C; ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 3.0V systems |
| Supply Current | ≤1.0µA at VCC = 3.0V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms (min) to 280ms (max) - guarantees sufficient processor initialization time after power recovery |
| VCC Operating Range | 1.2V to 5.5V - supports operation down to near-dead-battery conditions while remaining functional |
| Output Type | Open-drain RESET - allows flexible pull-up voltage selection and wired-OR reset bus implementation |
| Transient Immunity | Rejects negative VCC glitches <20µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Hysteresis | 6.3mV - minimizes chatter during slow VCC ramp-up or recovery near threshold |
Pinout & Package
MAX6328UR30+T is packaged in a 3-pin SOT23-3 surface-mount package (outline U3-1), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance of 4mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low open-drain output; sinks up to 1.6mA when asserted; requires external pull-up for logic-high state |
| 3 | VCC | Primary power input; powers internal circuitry and defines reset threshold reference; rated -0.3V to +6V absolute max |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA max at 3V - extends battery life in always-on monitoring applications |
| Factory-trimmed reset threshold | 3.00V with ±1.5% tolerance at +25°C - eliminates need for external calibration or trimming components |
| Guaranteed reset assertion down to 1.2V VCC | Ensures valid reset state even during deep brownout or battery sag - critical for fail-safe shutdown |
| Open-drain output architecture | Enables shared reset bus with multiple supervisors or µPs without contention - simplifies system-level reset coordination |
| Transient-immune comparator | Rejects sub-20µs VCC dips - avoids false resets caused by switching noise or ESD-induced supply disturbances |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers operating in harsh factory environments with fluctuating 24VDC-derived 3.0V rails. IC Role / Device Role / Timing Role: Brownout supervisor asserting reset during undervoltage events to prevent corrupted I/O state or firmware execution. Use Value: Prevents erratic behavior during line sags by holding µP in reset until stable 3.0V is confirmed for ≥100ms - ensuring deterministic boot sequence. |
Use Scenario: Remote environmental sensors powered by coin-cell batteries with long sleep cycles and infrequent wake-ups. IC Role / Device Role / Timing Role: Low-power supply monitor enabling safe wake-up only when VCC exceeds 3.0V threshold after cold start or battery recovery. Use Value: 1.0µA max ICC preserves battery capacity over multi-year deployments while guaranteeing reset validity down to 1.2V VCC. |
| Medical Diagnostic Handhelds | Automotive Body Control Modules |
Use Scenario: Portable ultrasound or glucose meters requiring FDA-compliant power integrity during battery swaps or low-voltage alerts. IC Role / Device Role / Timing Role: Fail-safe reset generator that forces controlled shutdown before data corruption occurs during voltage collapse. Use Value: Factory-trimmed 3.00V threshold with ±2.5% over temperature ensures consistent trip point across clinical operating ranges (-20°C to +55°C). |
Use Scenario: Non-safety-critical body electronics (e.g., door module, seat controller) powered from vehicle 12V-to-3.3V DC/DC with load-dump transients. IC Role / Device Role / Timing Role: Immune voltage supervisor rejecting fast negative spikes on 3.0V rail while asserting clean reset during sustained undervoltage. Use Value: 20µs transient rejection window prevents false resets during ISO 7637-2 pulse 1/2a events - improving system robustness without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328UR31+T | Reset threshold = 3.08V (±1.5%), 80mV higher nominal trip point | Suitable where tighter margin above 3.0V rail is required to avoid premature reset during ripple | Select when system VCC nominal is 3.3V with >100mV peak-to-peak ripple and reset must ignore minor dips |
| MAX809TR30+T | Same 3.00V threshold but push-pull output; 1.6µA max ICC; no 1.2V VCC operation guarantee | Lacks open-drain flexibility and ultra-low current; not suitable for battery life-critical or wired-OR designs | Choose only if board layout already uses push-pull reset and power budget allows higher current draw |
Compared with MAX6328UR30+T, the MAX6328UR31+T offers a slightly higher reset threshold for improved noise margin on 3.3V rails, while the MAX809TR30+T sacrifices open-drain capability and ultra-low current for legacy compatibility - making MAX6328UR30+T optimal for new energy-sensitive designs requiring bus-sharing flexibility.
Availability
MAX6328UR30+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical handheld diagnostics, automotive body control modules, and portable instrumentation requiring stable component supply with full RoHS compliance and tape-and-reel packaging.
Supply support for MAX6328UR30+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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications applications.
The MAX6326/MAX6327/MAX6328 family was designed specifically for ultra-low-power microprocessor supervision in space- and energy-constrained systems, emphasizing precision threshold accuracy, minimal current draw, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6328UR30+T and how does it vary with temperature?
The MAX6328UR30+T has a nominal reset threshold of 3.00V at +25°C, with ±1.5% tolerance at room temperature and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in a maximum deviation of approximately ±15mV across the temperature span - verified per the Electrical Characteristics table in the official datasheet.
Does MAX6328UR30+T support operation at VCC below 2.0V, and what is its minimum functional voltage?
Yes, MAX6328UR30+T is fully specified to operate down to VCC = 1.2V across -40°C to +85°C, and remains in a known reset state (RESET asserted) for VCC as low as 1.0V. This ensures fail-safe behavior during deep brownout conditions where other supervisors may release reset prematurely.
What is the maximum sink current capability of the open-drain RESET output on MAX6328UR30+T?
The RESET output of MAX6328UR30+T can sink up to 1.6mA while maintaining VOL ≤ 0.3V at VCC > 2.1V, and up to 100µA while maintaining VOL ≤ 0.4V at VCC ≥ 1.2V. These values are measured under reset assertion and define the upper limit for external pull-up resistor selection.
Can MAX6328UR30+T replace MAX809TR30+T directly on a PCB, and what design changes are needed?
No, MAX6328UR30+T cannot serve as a drop-in replacement for MAX809TR30+T due to its open-drain output versus the latter's push-pull configuration. A pull-up resistor must be added to the RESET net, and any logic expecting active-high reset assertion must be re-evaluated - though both share identical pinout and 3.00V threshold.
How does the transient immunity specification of MAX6328UR30+T protect against false resets in noisy environments?
MAX6328UR30+T rejects negative-going VCC transients shorter than 20µs when the overdrive (VTH − VCC) is 100mV, as shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive." This ensures that common switching noise or ESD-induced dips do not trigger spurious reset pulses.
MAX6328UR30+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:
- 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
MAX6328UR30+T FAQ
1.How can I place an order for MAX6328UR30+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR30+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 MAX6328UR30+T reliable?
The price and inventory of MAX6328UR30+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR30+T is usually 5 days.
3.What payment methods are accepted for MAX6328UR30+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR30+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR30+T?
MAX6328UR30+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR30+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 MAX6328UR30+T?
For technical support, including MAX6328UR30+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR30+T requirements.
6.How does Aetrix verify that MAX6328UR30+T is sourced from the original manufacturer or authorized distributors?
All MAX6328UR30+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 MAX6328UR30+T meets industry standards.
7.What is the process for return or replacement of MAX6328UR30+T?
All MAX6328UR30+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR30+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 MAX6328UR30+T part is unused and in its original packaging.
Return procedure for MAX6328UR30+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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