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Analog Devices Inc./Maxim Integrated MAX6328UR31-T
- Part No.:
- MAX6328UR31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,656
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Product details
Overview
MAX6328UR31-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in SOT23-3 package, monitoring 3.08V supply voltage with ±2.5% threshold accuracy over -40°C to +85°C, 1µA max supply current, and 100ms minimum reset timeout - used for reliable power-on/brownout reset assertion in portable µP systems.
For engineers reviewing the MAX6328UR31-T datasheet, MAX6328UR31-T pinout, MAX6328UR31-T application, or MAX6328UR31-T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for embedded power-monitoring designs.
Technical Context
The MAX6328UR31-T implements a precision bandgap-based reset comparator with factory-trimmed 3.08V threshold (±1.5% at +25°C, ±2.5% over full temperature range) and 6.3mV hysteresis, ensuring stable reset assertion during VCC transients. It operates down to 1.2V VCC and ignores fast negative-going glitches on VCC via internal transient immunity design.
Its open-drain RESET output supports bidirectional µP reset interfaces (e.g., Motorola 68HC11) with external pull-up, enabling either device to assert reset. The 100ms minimum reset timeout is guaranteed across temperature and supply voltage, with delay stability maintained by low tempco (40ppm/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±2.5% over -40°C to +85°C - ensures accurate brownout detection for 3.3V systems |
| Supply Current | 1.0µA max at 3.0V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms minimum after VCC rise - guarantees sufficient µP initialization time |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and bidirectional reset control |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and full-system power-up |
| Reset Hysteresis | 6.3mV - prevents chatter near threshold during slow VCC recovery |
| Tempco | 40ppm/°C - minimizes threshold drift across industrial temperature range |
Pinout & Package
MAX6328UR31-T uses the 3-pin SOT23-3 package (outline U3-1), with 1.3mm × 2.9mm footprint and gull-wing leads. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.
| 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 reset output - requires external pull-up resistor to host VCC or logic rail for proper level translation |
| 3 | VCC | Supply input - powers internal circuitry and serves as monitored voltage source; valid from 1.2V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 1µA max enables >10-year coin-cell operation in always-on monitoring applications |
| Factory-trimmed reset threshold | 3.08V with ±1.5% room-temp tolerance eliminates external calibration components |
| VCC transient immunity | Rejects <200µs negative glitches at 100mV overdrive - prevents false resets during switching noise |
| Full-temperature specification | All parameters guaranteed from -40°C to +85°C - suitable for uncontrolled industrial environments |
| No external components required | Self-contained reset generation - reduces BOM count and PCB area vs discrete solutions |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring long shelf life and reliable cold-start behavior. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset until regulated 3.3V rail stabilizes post-battery insertion or wake-up. Use Value: 1µA quiescent current extends single-CR2032 battery life beyond 5 years in standby; 3.08V threshold matches LDO output tolerance. |
Use Scenario: DIN-rail mounted I/O modules exposed to wide ambient temperatures and EMI-rich factory floors. IC Role / Device Role / Timing Role: Brownout detector preventing firmware corruption during 24VDC supply sags caused by motor startup. Use Value: ±2.5% threshold accuracy over -40°C to +85°C ensures consistent reset behavior without derating; open-drain output interfaces directly with optocoupled µP reset lines. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply (battery + mains) and tamper-detection logic. IC Role / Device Role / Timing Role: Primary VDD supervisor for the metering SoC, asserting reset during AC loss and battery switchover. Use Value: 100ms guaranteed timeout satisfies IEC 62056 power-fail hold-up timing; 1.2V minimum VCC operation supports backup supercap discharge down to safe shutdown. |
Use Scenario: Non-safety-critical body controllers (e.g., door module, seat control) operating from vehicle battery (9V–16V) with LDO regulation. IC Role / Device Role / Timing Role: Secondary supervisor verifying 3.3V domain stability before enabling CAN transceivers and sensor interfaces. Use Value: Open-drain RESET allows shared reset bus with other peripherals; 40ppm/°C tempco maintains threshold stability across under-hood thermal cycling. |
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 | 3.08V threshold, push-pull active-low output, 1.2µA supply current, same SOT23-3 package | Requires no external pull-up but cannot share reset bus; less suitable for bidirectional µP interfaces | Select when board layout lacks space for pull-up resistor or system uses dedicated reset line per IC |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V), 1.8µA supply current, adjustable delay option, same SOT23-3 package | Higher threshold may cause premature release in 3.3V systems with tight LDO tolerance; delay programmability adds flexibility but increases cost | Select when precise 3.08V threshold is not required and longer reset timeout (>200ms) is needed |
Compared with MAX809TRD2-T, the MAX6328UR31-T's open-drain output enables shared reset busing and bidirectional control, while its lower 1µA supply current extends battery life. Against TPS3808G33DBVR, MAX6328UR31-T offers tighter 3.08V threshold matching for margin-constrained 3.3V rails and superior low-power performance.
Availability
MAX6328UR31-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-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6328UR31-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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications systems.
The MAX6326/MAX6327/MAX6328 family targets ultra-low-power microprocessor supervision in battery-operated and thermally demanding environments, emphasizing minimal quiescent current, factory-trimmed accuracy, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6328UR31-T and how does it vary with temperature?
The MAX6328UR31-T has a nominal reset threshold of 3.08V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning threshold drift is limited to approximately ±12mV across the industrial temperature span - critical for stable operation in unregulated environments where the MAX6328UR31-T is deployed.
Why does MAX6328UR31-T use an open-drain output instead of push-pull?
The MAX6328UR31-T uses an open-drain RESET output to enable wired-OR reset bus configurations and direct interfacing with microprocessors having bidirectional reset pins (e.g., Motorola 68HC11). This architecture allows multiple devices - including the MAX6328UR31-T - to drive the same reset line without contention, which is essential in complex systems where both the supervisor and µP must be able to assert reset. Push-pull alternatives like MAX6326UR31-T cannot provide this capability.
Can MAX6328UR31-T operate reliably below 2.5V supply voltage?
Yes, the MAX6328UR31-T is fully specified to operate down to 1.2V VCC over the entire -40°C to +85°C temperature range, and remains functional (with correct reset state) down to 1.0V. This extended low-voltage capability allows the MAX6328UR31-T to monitor brownout conditions in systems powered by depleting batteries or supercapacitors, ensuring clean reset assertion even during deep discharge phases where other supervisors fail.
What is the minimum external pull-up resistor value required for MAX6328UR31-T's RESET pin?
The MAX6328UR31-T's open-drain RESET output sinks up to 1.6mA while asserted (low), with VOL ≤ 0.3V at that load. To ensure VOL stays within logic-low specifications for a 3.3V host system, a pull-up resistor ≤ 10kΩ to 3.3V is recommended. For 5V systems, ≤ 20kΩ maintains VOL < 0.4V. The MAX6328UR31-T's 0.1µA leakage current when inactive makes higher values acceptable for ultra-low-power sleep modes, but timing margins must be verified.
Is MAX6328UR31-T pin-compatible with legacy Maxim reset supervisors like MAX809?
No, MAX6328UR31-T is not pin-compatible with MAX809 series devices. While both use SOT23-3 packages, MAX809 variants have different pinouts: MAX809 uses Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET - whereas MAX6328UR31-T uses Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC. Swapping them without PCB revision will result in incorrect power connection and failure. Always verify pin mapping using the official MAX6328UR31-T datasheet before substitution.
MAX6328UR31-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6328UR31-T FAQ
1.How can I place an order for MAX6328UR31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR31-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 MAX6328UR31-T reliable?
The price and inventory of MAX6328UR31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR31-T is usually 5 days.
3.What payment methods are accepted for MAX6328UR31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR31-T?
MAX6328UR31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR31-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 MAX6328UR31-T?
For technical support, including MAX6328UR31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR31-T requirements.
6.How does Aetrix verify that MAX6328UR31-T is sourced from the original manufacturer or authorized distributors?
All MAX6328UR31-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 MAX6328UR31-T meets industry standards.
7.What is the process for return or replacement of MAX6328UR31-T?
All MAX6328UR31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR31-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 MAX6328UR31-T part is unused and in its original packaging.
Return procedure for MAX6328UR31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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