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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:7,608
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Product details
Overview
MAX6328UR31+T from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit that monitors VCC supply voltage and asserts an active-low reset signal when voltage falls below 3.08V, maintaining reset for ≥100ms after recovery; designed for 3.3V systems in portable/battery-powered equipment with 1µA max supply current and SOT23-3 packaging.
For engineers reviewing the MAX6328UR31+T datasheet, MAX6328UR31+T pinout, MAX6328UR31+T application, or MAX6328UR31+T equivalent, this page delivers verified technical context, precise reset threshold behavior, open-drain output design implications, and validated alternative options for µP 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 –40°C to +85°C) and 40ppm/°C tempco, enabling stable brownout detection across industrial temperature range. Its open-drain RESET output requires external pull-up and supports bidirectional µP reset interfaces like Motorola 68HC11.
It features transient immunity against negative-going VCC glitches up to 200µs at 100mV overdrive, and guarantees correct state down to VCC = 1.2V. Power-on reset timeout is 100–280ms, with 20µs VCC-to-reset delay and 6.3mV hysteresis to prevent chatter during threshold crossing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (±1.5% at +25°C); ensures reliable 3.3V system brownout detection without external calibration |
| Supply Current | 1.0µA max at 3V; enables multi-year battery life in portable monitoring applications |
| Reset Timeout | 100ms minimum power-up delay; meets µP minimum reset assertion time requirements |
| Output Type | Open-drain RESET; allows wired-OR configuration and interface with bidirectional µP reset pins |
| Operating Range | VCC = 1.2V to 5.5V; supports operation during deep brownout and compatibility with 1.8V–5V logic domains |
| Temp Range | –40°C to +85°C; qualified for industrial embedded control and automotive under-hood auxiliary systems |
| Hysteresis | 6.3mV; prevents oscillatory reset assertion near threshold during slow-ramping supplies |
Pinout & Package
MAX6328UR31+T is housed in a 3-pin SOT23-3 package (outline U3-1), with 1.3mm × 2.9mm footprint and gull-wing leads compatible with standard reflow profiles. RoHS-compliant lead-free finish denoted by "+T" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 - RESET | Active-low open-drain output | Sinks current when asserted; requires external pull-up resistor (typically 10kΩ to VCC or higher rail) for proper logic level translation |
| 3 - VCC | Supply input | Power source for internal circuitry; accepts 1.2V–5.5V; decoupling capacitor (0.1µF ceramic) recommended within 5mm |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max supply current enables integration into always-on battery-backed subsystems without measurable drain |
| Factory-trimmed VTH | 3.08V threshold set at wafer test with ±1.5% tolerance; eliminates need for external resistor divider or trimming |
| Open-drain architecture | Supports multi-source reset arbitration and level-shifting via external pull-up to any compatible voltage rail (e.g., 1.8V, 3.3V, 5V) |
| Transient immunity | Immune to VCC glitches ≤200µs at 100mV overdrive; prevents false resets in noisy power environments |
| Guaranteed state down to 1.2V | Remains functional and holds valid reset state even as VCC collapses below 1.8V, ensuring clean shutdown sequencing |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor with BLE radio that must retain calibration data and wake reliably after power interruption. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low signal to MCU during brownout, holding reset ≥100ms post-recovery to ensure full core initialization. Use Value: 1µA max ICC extends CR2032 battery life beyond 3 years in sleep mode; open-drain output interfaces directly with BLE SoC's bidirectional reset pin using single 10kΩ pull-up. |
Use Scenario: DIN-rail mounted analog input module operating in factory floor environment with fluctuating 24VDC supply. IC Role / Device Role / Timing Role: VCC supervisor monitoring local 3.3V LDO output, triggering hardware reset on 3.08V threshold breach caused by LDO dropout or EMI-induced sag. Use Value: 40ppm/°C tempco ensures <±25mV drift over –40°C to +85°C; 6.3mV hysteresis prevents chattering during slow 24V supply ramp-up after mains restoration. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: ANSI C12.22-compliant electricity meter with tamper-detection circuitry requiring deterministic power-fail response. IC Role / Device Role / Timing Role: Primary reset supervisor for metrology SoC, asserting reset within 20µs of VCC dropping below 3.08V and holding ≥100ms for EEPROM write completion. Use Value: Guaranteed operation down to VCC = 1.2V allows safe shutdown sequence even during rapid 3.3V rail collapse; SC70/SOT23 footprint minimizes PCB area in space-constrained meter housing. |
Use Scenario: Door module controlling window lift, mirror fold, and interior lighting powered from vehicle's 12V battery via local 3.3V regulator. IC Role / Device Role / Timing Role: Brownout detector for microcontroller managing LIN communication and motor drivers; asserts reset on 3.08V threshold violation during cold-crank or load-dump events. Use Value: Immunity to ≤200µs transients prevents false resets during alternator ripple or relay switching noise; SOT23-3 package withstands automotive thermal cycling per AEC-Q200. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR31+T | Push-pull active-low RESET output; no external pull-up required; VOH = 0.8·VCC, VOL = 0.3V @ 1.6mA | Preferred where board space prohibits pull-up resistor or where driving capacitive loads directly is needed | Select when system lacks pull-up infrastructure or requires stronger drive capability without external components |
| TLV803EB31DBVR | 3.08V threshold, SOT23-3, open-drain, but 0.5µA typical ICC (vs. 1µA max for MAX6328UR31+T); no guaranteed 1.2V operation | Better suited for ultra-low-power IoT nodes where sub-µA sleep current is critical and VCC rarely drops below 1.8V | Choose when absolute minimum quiescent current dominates over brownout robustness below 1.8V |
Compared with MAX6326UR31+T, the MAX6328UR31+T trades push-pull drive strength for flexible wired-OR reset bus integration; versus TLV803EB31DBVR, it offers guaranteed functionality down to 1.2V and superior transient immunity-critical for industrial brownout resilience.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX632x family was designed specifically for cost-sensitive, space-constrained microprocessor supervision in battery-powered and industrial systems-emphasizing ultra-low ICC, factory-trimmed accuracy, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6328UR31+T and how tightly is it specified?
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. This specification is factory-trimmed and guaranteed-not typical-ensuring consistent brownout detection across temperature without external calibration. The device also provides 6.3mV hysteresis to prevent oscillation near the threshold.
Does MAX6328UR31+T require an external pull-up resistor on its RESET pin?
Yes, MAX6328UR31+T features an open-drain RESET output and requires an external pull-up resistor to establish a defined high-level voltage when reset is inactive. A typical value is 10kΩ connected to the target µP's VCC or another compatible rail. The pull-up value affects rise time and noise immunity; values between 4.7kΩ and 100kΩ are commonly used depending on bus capacitance and speed requirements.
Can MAX6328UR31+T operate reliably when VCC drops below 1.8V?
Yes, MAX6328UR31+T is fully specified to operate and maintain correct reset state down to VCC = 1.2V, making it suitable for deep brownout scenarios where other supervisors fail. This capability ensures deterministic reset assertion and hold timing even during severe supply collapse-critical for safe shutdown in portable and automotive systems.
How does the transient immunity of MAX6328UR31+T compare to standard reset ICs?
MAX6328UR31+T is designed to ignore fast negative-going VCC transients up to 200µs in duration when the overdrive (VTH – VCC) is 100mV. This exceeds typical industry specs and prevents false resets caused by switching noise, relay bounce, or load-dump events-verified by the "Maximum Transient Duration vs. Reset Threshold Overdrive" curve in the datasheet.
Is MAX6328UR31+T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, MAX6328UR31+T is pin-compatible with MAX809, MAX803, and MAX810 in the SOT23-3 package. Pin 1 is GND, Pin 2 is RESET (open-drain), and Pin 3 is VCC-matching the same physical layout and footprint. This allows drop-in replacement in existing designs while upgrading to lower ICC (1µA vs. 20µA) and improved temperature stability.
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:
- Active
- 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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