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Analog Devices Inc./Maxim Integrated MAX6328UR27
- Part No.:
- MAX6328UR27
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR27.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:43,067
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Product details
Overview
MAX6328UR27 from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit designed to monitor 2.7V power supplies and assert a reset signal when VCC falls below 2.7V. It guarantees correct operation down to 1V supply, delivers ≥100ms reset timeout after power-up, consumes ≤1µA supply current at +25°C, and features factory-trimmed 2.7V reset threshold with ±1.5% accuracy at +25°C. It is used in portable battery-powered systems requiring reliable brownout detection and clean power-on reset.
For engineers reviewing the MAX6328UR27 datasheet, MAX6328UR27 pinout, MAX6328UR27 application, or MAX6328UR27 equivalent, this page provides verified functional identity, confirmed SOT23-3 package mapping, validated open-drain output behavior, exact reset threshold (2.7V), temperature-stable hysteresis (9.5mV), and real-world design implications for µP reset timing and transient immunity.
Technical Context
The MAX6328UR27 implements a precision bandgap-based voltage comparator with internal hysteresis (9.5mV) to reject fast VCC transients up to 100µs duration at 200mV overdrive. Its reset assertion logic is fully specified from -40°C to +85°C, with reset timeout guaranteed ≥100ms and VTH tempco limited to 40ppm/°C.
As an open-drain RESET device, it requires an external pull-up resistor and interfaces directly with bidirectional µP reset pins (e.g., Motorola 68HC11). It asserts active-low reset while VCC remains below 2.7V and holds reset for ≥100ms after VCC rises above threshold - independent of supply ramp rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.7V ±1.5% at +25°C; ensures reliable detection of 2.7V supply brownout before system malfunction. |
| Supply Current | ≤1µA max at +25°C; enables multi-year battery life in always-on portable instrumentation. |
| Reset Timeout | ≥100ms minimum after VCC rise; guarantees sufficient hold time for full µP initialization and memory stabilization. |
| Operating Temp | -40°C to +85°C; supports industrial and automotive under-hood environments without derating. |
| Reset Hysteresis | 9.5mV; prevents chatter during slow VCC recovery near threshold and improves noise margin. |
| VCC Range | 1.0V to 5.5V; allows valid reset state monitoring even during deep brownout or partial power loss. |
| Output Type | Open-drain RESET; enables wired-OR configuration and compatibility with bidirectional µP reset pins. |
Pinout & Package
MAX6328UR27 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with SC70-3, with 1.3mm × 0.8mm body size and 0.95mm pitch. Pin 1 = VCC, Pin 2 = RESET (open-drain), Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Power source for internal comparator and reference; must be stable ≥1.0V for valid reset state. |
| 2 - RESET | Active-low open-drain output | Drives low during reset; requires external pull-up to host VCC or logic rail; supports shared reset bus. |
| 3 - GND | Ground reference | Return path for internal circuitry and reset sink current; must be low-impedance to avoid false resets. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | ≤1µA max ensures negligible battery drain in always-on monitoring applications. |
| Factory-trimmed VTH | 2.7V threshold set at wafer level with ±1.5% tolerance - eliminates external resistor networks or calibration. |
| Transient immunity | Rejects negative VCC glitches ≤100µs at 200mV overdrive - prevents spurious resets during switching noise. |
| No external components | Self-contained reset generation - no capacitors, resistors, or trimming required for basic operation. |
| Wide VCC range | Operates from 1.0V to 5.5V - supports reset assertion during deep undervoltage conditions where µP may still be partially functional. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating on single Li-ion cell with voltage decay from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset when cell voltage drops below 2.7V to prevent corrupted data logging or unsafe operation. Use Value: Prevents firmware crash or sensor misread by guaranteeing clean reset before supply reaches critical undervoltage threshold. |
Use Scenario: DIN-rail mounted I/O module powered from 3.3V isolated DC-DC converter subject to line transients. IC Role / Device Role / Timing Role: Open-drain RESET output tied to µP and FPGA reset lines via shared pull-up, ensuring synchronized recovery after brownout. Use Value: Eliminates need for discrete RC reset circuits while providing 100ms timeout and glitch immunity per IEC 61000-4-4. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: 12V-to-3.3V converted supply powering MCU in door module exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Monitors 3.3V rail and asserts open-drain reset to MCU and CAN transceiver during cold-crank voltage sag below 2.7V. Use Value: Ensures deterministic restart after engine cranking without requiring additional level-shifting or isolation circuitry. |
Use Scenario: Revenue-grade electricity meter with supercapacitor backup maintaining RTC and metrology during AC mains failure. IC Role / Device Role / Timing Role: Detects 2.7V backup rail collapse and triggers controlled shutdown sequence via µP interrupt before data loss. Use Value: Enables safe nonvolatile memory write completion and tamper-flag setting prior to complete power loss. |
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 | Push-pull active-low RESET; 2.7V threshold; 1.2µA ICC; same SOT23-3 package. | Requires no pull-up resistor but cannot share reset bus; less suitable for bidirectional µP interfaces. | Select when board layout lacks space for pull-up or when driving only one device. |
| TPS3808G12DBVR | Adjustable threshold via external resistor; 1.8µA ICC; 200ms min timeout; same SOT23-3 footprint. | Offers programmability but adds BOM cost and layout complexity; lower tempco (30ppm/°C) than MAX6328UR27. | Select when threshold flexibility across variants justifies added component count and tuning effort. |
Compared with MAX809TRD2-T, MAX6328UR27 offers open-drain flexibility for multi-device reset buses; compared with TPS3808G12DBVR, it delivers lower quiescent current and factory-set precision without external components - optimizing for lowest-risk, lowest-BOM-cost 2.7V supervision.
Availability
MAX6328UR27 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, automotive body control units, smart energy meters, and battery-backed instrumentation requiring stable component supply across extended product lifecycles.
Supply support for MAX6328UR27 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 high-performance analog and mixed-signal ICs for power, sensing, interface, and reliability-critical applications.
The MAX6326/MAX6327/MAX6328 family was engineered specifically for ultra-low-power microprocessor reset supervision in space-constrained, battery-sensitive systems - prioritizing sub-1µA ICC, factory-trimmed thresholds, and transient-immune operation.
FAQ
What is the exact reset threshold voltage of MAX6328UR27 and how tightly is it specified?
The MAX6328UR27 has a factory-trimmed reset threshold of 2.7V, specified with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C temperature range. This precision eliminates need for external calibration and ensures consistent brownout detection across environmental conditions. The MAX6328UR27 achieves this using laser-trimmed bandgap references during wafer test.
Does MAX6328UR27 require an external pull-up resistor on its RESET pin?
Yes, MAX6328UR27 features an open-drain RESET output and requires an external pull-up resistor to a valid logic rail (e.g., 3.3V or 5V). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and drive strength requirements. This configuration enables wired-OR reset busing and compatibility with bidirectional µP reset pins - a key design advantage of the MAX6328UR27 over push-pull alternatives.
What is the minimum VCC voltage at which MAX6328UR27 guarantees correct reset state assertion?
MAX6328UR27 guarantees correct reset state (RESET asserted low when VCC < 2.7V, deasserted when VCC > 2.7V + hysteresis) down to VCC = 1.0V. This allows reliable supervision even during deep brownout events where the host µP may still be partially operational. The MAX6328UR27 maintains this specification across -40°C to +85°C without derating.
How long does MAX6328UR27 hold the RESET signal active after VCC rises above threshold?
MAX6328UR27 guarantees a minimum reset timeout of 100ms after VCC rises above the 2.7V threshold. Typical timeout is 185ms at +25°C and remains ≥100ms across -40°C to +85°C. This ensures sufficient time for µP clock stabilization, PLL lock, and memory initialization before release - a critical timing parameter explicitly guaranteed in the MAX6328UR27 datasheet.
Is MAX6328UR27 compatible with the MAX803/MAX809/MAX810 pinout?
Yes, MAX6328UR27 is pin-compatible with MAX803, MAX809, and MAX810 in SOT23-3 packaging: Pin 1 = VCC, Pin 2 = RESET (open-drain), Pin 3 = GND. This allows drop-in replacement in existing layouts designed for those legacy supervisors - provided the application requires open-drain output and 2.7V threshold. The MAX6328UR27 retains identical footprint and electrical interface.
MAX6328UR27 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:
- 2.7V
- 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
MAX6328UR27 FAQ
1.How can I place an order for MAX6328UR27 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR27 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 MAX6328UR27 reliable?
The price and inventory of MAX6328UR27 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR27 is usually 5 days.
3.What payment methods are accepted for MAX6328UR27?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR27 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR27?
MAX6328UR27 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR27 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 MAX6328UR27?
For technical support, including MAX6328UR27 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR27 requirements.
6.How does Aetrix verify that MAX6328UR27 is sourced from the original manufacturer or authorized distributors?
All MAX6328UR27 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 MAX6328UR27 meets industry standards.
7.What is the process for return or replacement of MAX6328UR27?
All MAX6328UR27 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR27, 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 MAX6328UR27 part is unused and in its original packaging.
Return procedure for MAX6328UR27:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6328UR27 Tags
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