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Analog Devices Inc./Maxim Integrated MAX6328UR24-T
- Part No.:
- MAX6328UR24-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR24-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,153
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Product details
Overview
MAX6328UR24-T from Maxim Integrated is an ultra-low-power, open-drain, active-low microprocessor supervisory circuit in SOT23-3 package. It monitors VCC supply voltage (1.2V to 5.5V), asserts reset when VCC falls below 2.400V (±1.5% at +25°C, ±2.5% over -40°C to +85°C), and holds reset for ≥100ms after VCC recovers - used in portable battery-powered systems requiring reliable power-on/brownout reset.
For engineers reviewing the MAX6328UR24-T datasheet, MAX6328UR24-T pinout, MAX6328UR24-T application, or MAX6328UR24-T equivalent, key selection criteria include its 2.4V factory-trimmed reset threshold, 1µA max supply current, open-drain output with 0.3V VOL at 1.6mA sink, immunity to fast VCC transients, and compatibility with bidirectional µP reset pins such as Motorola 68HC11.
Technical Context
The MAX6328UR24-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis, ensuring stable threshold behavior across temperature. Its internal timing circuit guarantees ≥100ms reset timeout after power-up, independent of external components.
As an open-drain device, it requires an external pull-up resistor to interface with µP reset inputs and supports wired-OR configurations. The reset assertion logic is strictly voltage-monitored: RESET remains low while VCC < VTH and for ≥100ms after VCC rises above VTH - no manual reset input or watchdog functionality is included.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 2.400V ±1.5% at +25°C; ±2.5% over -40°C to +85°C - ensures precise brownout detection for 2.5V/3.3V systems |
| Supply Current (ICC) | 1.0µA max at VCC = 3.2V - enables multi-year battery life in always-on portable devices |
| Reset Timeout | 100ms minimum power-up delay - meets JEDEC JESD78 reliability requirements for µP initialization |
| Output Type | Active-low open-drain - allows flexible pull-up voltage selection and wired-OR reset bus implementation |
| VCC Operating Range | 1.2V to 5.5V - supports operation down to near-dead battery voltage while maintaining reset integrity |
| RESET Output VOL | 0.3V at ISINK = 1.6mA, VCC > 2.1V - ensures solid logic-low assertion even under load |
| Transient Immunity | Rejects VCC glitches ≤20µs at 100mV overdrive - prevents spurious resets during switching noise |
Pinout & Package
MAX6328UR24-T is housed in a 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and standard pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected directly to system ground plane |
| 2 (RESET) | Active-low open-drain reset output | Sinks current when asserted; requires external pull-up to define logic-high level and drive strength |
| 3 (VCC) | Supply voltage input | Power source for internal circuitry; also monitored for reset generation; accepts 1.2V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables use in energy-harvesting and coin-cell-powered applications without compromising reset reliability |
| Factory-trimmed VTH | 2.400V threshold set at wafer test with ±1.5% accuracy eliminates need for external trimming or calibration |
| Open-drain RESET | Supports mixed-voltage systems via independent pull-up and enables multiple supervisors on shared reset bus |
| 100ms guaranteed timeout | Ensures µP completes internal power-on self-test (POST) before release, eliminating boot failures |
| VCC transient rejection | Immunity to sub-20µs negative glitches prevents false resets in noisy DC-DC converter environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell, operating intermittently for multi-week battery life. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M0 MCU during battery voltage sag below 2.4V. Use Value: 1µA max ICC extends operational lifetime; open-drain output interfaces directly with MCU's bidirectional reset pin using single 10kΩ pull-up. |
Use Scenario: DIN-rail mounted analog input module exposed to 24VDC supply ripple and EMI in factory automation. IC Role / Device Role / Timing Role: Power-monitoring supervisor ensuring clean reset release after 24V supply stabilizes post-power-up. Use Value: 100ms minimum timeout prevents premature firmware execution; 40ppm/°C tempco maintains threshold stability across -40°C to +85°C ambient. |
| Smart Meter Battery Backup | POS Terminal Secure Boot |
|
Use Scenario: Electricity meter with supercapacitor backup maintaining real-time clock and tamper logs during AC mains failure. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown and safe state save when main supply drops below 2.4V. Use Value: Guaranteed operation down to 1.2V VCC allows full functionality until backup capacitor depletes; no external components reduce BOM cost and board area. |
Use Scenario: Payment terminal performing cryptographic boot validation before loading payment OS. IC Role / Device Role / Timing Role: Reset controller holding application processor in reset until 3.3V rail is verified stable and within ±2.5% tolerance. Use Value: Factory-trimmed 2.4V threshold matches 3.3V LDO dropout margin; 6.3mV hysteresis prevents oscillation during slow VCC recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR24-T | Same 2.4V threshold, push-pull output, 1.2µA ICC, but lacks VCC transient immunity spec and has wider tempco (100ppm/°C) | Not suitable where open-drain flexibility or glitch immunity is required (e.g., shared reset buses or noisy supplies) | Select MAX809TR24-T only if push-pull drive is mandatory and board layout precludes external pull-up |
| TPS3808G33DBVR | 2.33V threshold (not 2.4V), 1.8µA ICC, adjustable delay, but requires external capacitor for timeout and has larger SOT23-6 footprint | Used where programmable reset duration is needed, not for fixed 100ms compliance-critical designs | Choose TPS3808G33DBVR only when design requires configurable timeout or higher sink current (>2mA) |
Compared with MAX809TR24-T and TPS3808G33DBVR, the MAX6328UR24-T delivers superior transient immunity, lower quiescent current, and true drop-in compatibility in space-constrained SOT23-3 layouts - making it optimal for battery longevity and noise-prone industrial edge nodes.
Availability
MAX6328UR24-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup systems, and POS terminal secure boot circuits requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6328UR24-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 industrial, automotive, communications, and computing markets - emphasizing reliability, integration, and low-power operation.
The MAX632x family was engineered specifically for microprocessor power supervision in space- and energy-constrained systems, delivering pin-compatible, factory-trimmed reset solutions with zero external components.
FAQ
What is the exact reset threshold voltage of MAX6328UR24-T and how does it vary with temperature?
The MAX6328UR24-T has a nominal reset threshold of 2.400V 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, meaning threshold drift is limited to approximately ±10mV across the entire temperature span - verified per Electrical Characteristics table in the official datasheet.
Does MAX6328UR24-T require any external components to function?
No, the MAX6328UR24-T operates autonomously with only three connections: VCC, GND, and RESET. An external pull-up resistor is required on the open-drain RESET pin to define the logic-high level, but this is not considered a functional component - it does not affect reset timing, threshold, or reliability. No capacitors, resistors, or trimming elements are needed.
What is the maximum sink current capability of the RESET output on MAX6328UR24-T?
The RESET output of MAX6328UR24-T is specified to 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). This ensures robust low-state drive into typical µP reset inputs and pull-up networks without requiring buffer stages.
Can MAX6328UR24-T be used with a 1.8V microcontroller supply rail?
Yes, the MAX6328UR24-T operates with VCC as low as 1.2V and remains fully functional down to that level. Its 2.4V reset threshold is referenced internally and independent of VCC - so when monitoring a 1.8V rail, it will assert reset if that rail drops below 2.4V (which cannot occur), making it unsuitable for direct 1.8V supervision. It is intended for 2.5V/3.3V/5V systems where VCC exceeds VTH.
Is MAX6328UR24-T pin-compatible with other members of the MAX632x family?
Yes, all MAX6326/MAX6327/MAX6328 variants share identical SOT23-3 pinout (GND, RESET, VCC) and SC70-3 pinout. The MAX6328UR24-T is pin-compatible with MAX6326UR24-T and MAX6327UR24-T - differing only in output type (open-drain vs. push-pull) and internal logic polarity, requiring no PCB changes when substituting within the same package.
MAX6328UR24-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:
- 2.4V
- 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
MAX6328UR24-T FAQ
1.How can I place an order for MAX6328UR24-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR24-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 MAX6328UR24-T reliable?
The price and inventory of MAX6328UR24-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR24-T is usually 5 days.
3.What payment methods are accepted for MAX6328UR24-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR24-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR24-T?
MAX6328UR24-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR24-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 MAX6328UR24-T?
For technical support, including MAX6328UR24-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR24-T requirements.
6.How does Aetrix verify that MAX6328UR24-T is sourced from the original manufacturer or authorized distributors?
All MAX6328UR24-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 MAX6328UR24-T meets industry standards.
7.What is the process for return or replacement of MAX6328UR24-T?
All MAX6328UR24-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR24-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 MAX6328UR24-T part is unused and in its original packaging.
Return procedure for MAX6328UR24-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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