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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:5,000
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Product details
Overview
MAX6328UR23-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in SOT23-3 package, designed to monitor 2.5V/3V/3.3V/5V power rails. It asserts reset when VCC falls below 2.32V (±2.5% over temperature), maintains reset for ≥100ms after recovery, draws ≤1µA supply current at 3V, and operates from -40°C to +85°C - used in portable battery-powered systems requiring reliable brownout protection.
For engineers reviewing the MAX6328UR23-T datasheet, MAX6328UR23-T pinout, MAX6328UR23-T application, or MAX6328UR23-T equivalent, this page delivers verified reset threshold accuracy, open-drain interface behavior, ultra-low quiescent current, thermal stability, and SOT23-3 footprint compatibility with legacy µP supervisors.
Technical Context
The MAX6328UR23-T implements a precision bandgap-based voltage comparator with factory-trimmed 2.32V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C) and 6.3mV hysteresis. Its open-drain RESET output requires an external pull-up and supports bidirectional µP reset pins like those on Motorola 68HC11.
It features transient immunity up to 100V/µs dV/dt on VCC, ignores fast negative-going glitches per the Maximum Transient Duration vs. Threshold Overdrive curve, and guarantees correct state down to VCC = 1.2V - enabling robust operation during deep brownouts and low-voltage wake-up sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V ±2.5% over -40°C to +85°C - ensures reliable detection of 2.5V rail collapse without false triggering. |
| Supply Current | ≤1.0µA at 3V - enables multi-year battery life in always-on monitoring applications. |
| Reset Timeout | 100ms minimum power-up delay - satisfies Intel-compatible reset timing requirements for x86 and ARM µPs. |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and direct interface with bidirectional µP reset pins. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep undervoltage conditions and across multiple logic families. |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts and automated assembly. |
| Temperature Range | -40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments. |
Pinout & Package
SOT23-3 package: 2.92mm × 1.3mm × 1.02mm body, gull-wing leads, JEDEC MO-178AA compliant.
| 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 | Open-drain active-low output; requires external pull-up resistor (typically 10kΩ) to VCC or another logic rail. |
| 3 | VCC | Power supply input; monitors this rail for reset assertion; supports operation down to 1.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max at 3V - eliminates need for power-gating circuitry in energy-constrained designs. |
| Factory-trimmed VTH | 2.32V with ±1.5% room-temp tolerance - removes calibration overhead and external resistor networks. |
| Transient immunity | Immune to VCC glitches <100µs wide at 200mV overdrive - prevents spurious resets in noisy power environments. |
| No external components | Self-contained reset generation - reduces BOM count, PCB area, and qualification effort versus discrete solutions. |
| Pin compatibility | Drop-in replacement for MAX803/MAX809/MAX810 in SOT23-3 - enables legacy design upgrades without layout changes. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meters and pulse oximeters operating on single-cell Li-ion (2.7–4.2V) with sleep/wake cycles lasting months. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during battery voltage sag below 2.32V to prevent firmware corruption during low-power wake-up. Use Value: 1µA supply current extends usable battery life beyond 2 years; open-drain output interfaces directly with MSP430's bidirectional RST/NMI pin. |
Use Scenario: DIN-rail mounted I/O modules exposed to 24VDC supply ripple and ESD transients in factory automation cabinets. IC Role / Device Role / Timing Role: Power-on and brownout detector ensuring clean µC initialization before fieldbus communication starts. Use Value: 100ms minimum reset timeout meets PROFIBUS DP slave startup timing; ±2.5% VTH tolerance accommodates wide ambient temperature swings. |
| Smart Energy Meters | Automotive Body Control Units |
|
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply (3.3V MCU + 5V metrology ASIC) and tamper-detection circuits. IC Role / Device Role / Timing Role: Independent 3.3V rail monitor providing early-reset signal to MCU before metrology ASIC fails. Use Value: Factory-trimmed 2.32V threshold precisely targets 3.3V rail dropout margin; SOT23-3 footprint fits tight meter PCB real estate. |
Use Scenario: 12V automotive subsystems (e.g., door module) powered via LDO-regulated 3.3V, subject to load-dump and cold-crank events. IC Role / Device Role / Timing Role: Brownout supervisor holding µC in reset during cranking-induced 6V dips, releasing only after stable 3.3V resumes for ≥100ms. Use Value: Guaranteed operation down to 1.2V VCC allows detection during extreme cold-crank; open-drain output avoids contention with CAN transceiver reset lines. |
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; 2.32V threshold; same SOT23-3 package; 1.2µA ICC. | Requires no pull-up resistor but cannot wire-OR with other reset sources; less suitable for bidirectional µP pins. | Select when board space permits simpler output drive and no shared reset bus is needed. |
| TPS3808G12DBVR | Adjustable threshold via external resistor divider; 2.5V nominal; 1.8µA ICC; same SOT23-3. | Enables custom reset points but adds BOM item and layout complexity; lacks factory-trimmed precision. | Select when nonstandard thresholds (e.g., 2.45V) are required and calibration overhead is acceptable. |
Compared with MAX809TRD2-T, the MAX6328UR23-T provides true open-drain flexibility for multi-source reset arbitration; compared with TPS3808G12DBVR, it delivers guaranteed 2.32V accuracy without external components - simplifying qualification and reducing long-term drift risk.
Availability
MAX6328UR23-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
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) designs precision analog, mixed-signal, and power management ICs for industrial, communications, computing, and consumer applications.
The MAX6328UR23-T belongs to Maxim's ultra-low-power µP supervisory product line, engineered specifically for battery-operated and thermally demanding systems where reset accuracy, minimal current draw, and small footprint are critical.
FAQ
What is the exact reset threshold voltage of the MAX6328UR23-T and how does it vary with temperature?
The MAX6328UR23-T has a factory-trimmed nominal reset threshold of 2.32V, specified as ±1.5% at +25°C 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 ~±11.6mV across the temperature range - sufficient for stable 2.5V rail monitoring without recalibration.
Does the MAX6328UR23-T require an external pull-up resistor on its RESET pin?
Yes, the MAX6328UR23-T features an open-drain RESET output and requires an external pull-up resistor to a valid logic rail (e.g., VCC or 3.3V). A 10kΩ resistor is typical; value selection balances rise time against power consumption. Without this resistor, the RESET signal remains floating and cannot drive downstream logic reliably.
Can the MAX6328UR23-T operate correctly if the VCC supply drops below 2.32V but stays above 1.2V?
Yes, the MAX6328UR23-T is fully specified to operate down to VCC = 1.2V and guarantees correct reset assertion state across that range. Even at 1.2V, it will assert RESET when VCC falls below the 2.32V threshold and hold it for ≥100ms after recovery - making it suitable for deep brownout detection in low-voltage wake-up scenarios.
Is the MAX6328UR23-T pin-compatible with the MAX809 series in SOT23-3 packages?
Yes, the MAX6328UR23-T shares identical pinout (GND–RESET–VCC), footprint, and package dimensions with MAX809TRD2-T and other SOT23-3 µP supervisors. However, its open-drain output differs from the MAX809's push-pull structure - requiring verification of downstream reset bus topology before drop-in replacement.
What is the maximum allowable transient duration on VCC that will not trigger a false reset on the MAX6328UR23-T?
At a 200mV overdrive (i.e., VCC = 2.12V when VTH = 2.32V), the MAX6328UR23-T tolerates transients up to ~120µs without issuing a reset, per the Typical Operating Characteristics graph. As overdrive increases, allowable duration decreases - e.g., at 10mV overdrive (~2.31V), it rejects transients <10µs. This immunity prevents false resets from switching noise or ESD coupling.
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:
- Bulk
- 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.
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