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Analog Devices Inc./Maxim Integrated MAX6328XR25
- Part No.:
- MAX6328XR25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6328XR25.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:811
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Product details
Overview
MAX6328XR25 from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit designed to monitor 2.5V power supplies and assert an active-low reset signal during brownout, power-up, and power-down events. It features a factory-trimmed 2.500V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset supervision.
For engineers reviewing the MAX6328XR25 datasheet, MAX6328XR25 pinout, MAX6328XR25 application, or MAX6328XR25 equivalent, this page delivers verified technical context, exact pin functionality, real-world use cases for µP reset supervision, and validated alternative options - all grounded in Maxim's official specifications for the SC70-3 packaged variant with R25 suffix.
Technical Context
The MAX6328XR25 implements a precision voltage comparator with hysteresis (6.3mV) and internal timing circuitry to guarantee ≥100ms reset assertion after VCC rises above the 2.500V threshold. Its open-drain RESET output requires an external pull-up and supports bidirectional µP reset interfaces (e.g., Motorola 68HC11), enabling either the supervisor or microcontroller to drive the reset line.
It is immune to fast VCC transients (up to 100V/µs rate-of-rise), with transient rejection characterized across reset threshold overdrive - e.g., a 100mV dip below VTH is tolerated for up to ~160µs without spurious reset. The device functions fully from VCC = 1.2V to 5.5V and draws only 0.5–1.0µA typical supply current at 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.500V (±1.5% at +25°C; ±2.5% over -40°C to +85°C) - ensures precise 2.5V supply monitoring with guaranteed margin against false resets. |
| Reset Timeout | 100ms minimum - guarantees sufficient reset hold time for full µP initialization after power stabilization. |
| Supply Current | 1.0µA max (at VCC = 3.0V, VTH ≤ 2.93V) - enables multi-year operation in coin-cell–powered devices. |
| Output Type | Open-drain RESET - allows wired-OR configuration and compatibility with bidirectional µP reset pins. |
| VCC Operating Range | 1.2V to 5.5V - supports supervision across wide input conditions, including deep brownout detection. |
| Reset Hysteresis | 6.3mV - prevents oscillation near threshold during slow VCC recovery. |
| Transient Immunity | Rejects VCC glitches ≤160µs at 100mV overdrive - eliminates false resets from switching noise or coupling. |
Pinout & Package
MAX6328XR25 is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (marked "FQAA" on top).
| 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 | Active-low open-drain output; requires external pull-up resistor (typically 10–100kΩ) to host VCC or logic rail; sinks ≥1.6mA when asserted. |
| 3 | VCC | Power supply input; monitors itself for reset generation; accepts 1.2V–5.5V; decoupling capacitor (0.1µF) recommended adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year battery life in always-on IoT sensors and wearables. |
| Factory-trimmed VTH | 2.500V threshold with ±1.5% room-temp accuracy eliminates calibration overhead and external resistors. |
| Open-drain RESET | Enables shared reset bus with multiple controllers (e.g., µP + FPGA) without contention or level-shifting. |
| 100ms min timeout | Guarantees µP core and peripherals fully initialize before release - meets ARM Cortex-M and PIC timing requirements. |
| VCC down to 1.2V operation | Ensures valid reset assertion even during severe brownout, preventing corrupted firmware execution. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell, operating intermittently for multi-week data logging. IC Role / Device Role / Timing Role: Supervises 2.5V LDO output to ensure clean reset of ultra-low-power MCU upon battery insertion or voltage sag. Use Value: 1µA max ICC extends battery life beyond 2 years; open-drain output interfaces directly with MCU's bidirectional reset pin without added logic. |
Use Scenario: DIN-rail mounted analog input module exposed to 24V DC field power with ripple and transients. IC Role / Device Role / Timing Role: Monitors local 2.5V digital supply derived from noisy 24V bus; asserts reset during line dips or ESD-induced sags. Use Value: 100ms timeout prevents spurious reboots during brief dips; 6.3mV hysteresis avoids chatter during slow recovery. |
| Smart Meter Communication Units | Automotive Body Control Modules (BCM) |
|
Use Scenario: NB-IoT modem subsystem in electricity meter, waking every 15 minutes to transmit data. IC Role / Device Role / Timing Role: Provides deterministic reset to modem SoC after cold start or brownout caused by RF transmission current surges. Use Value: Factory-trimmed 2.500V threshold matches modem's core supply spec; SC70-3 footprint saves space in constrained meter PCB layout. |
Use Scenario: Low-voltage interior lighting controller powered from vehicle battery (9–16V), regulating 2.5V logic rail. IC Role / Device Role / Timing Role: Detects undervoltage on 2.5V rail during cranking (battery drop to 6V) and holds MCU in reset until stable. Use Value: Operates down to 1.2V VCC - remains functional during extreme cranking events where other supervisors fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328UR25-T | Identical electrical specs and reset behavior; differs only in SOT23-3 package (U3-1 outline) vs. SC70-3 (X3-2). | SOT23-3 has larger pad pitch (0.95mm vs. 0.65mm) and higher thermal resistance - less suitable for ultra-dense layouts. | Select MAX6328UR25-T only if existing board uses SOT23 footprints or requires higher power dissipation margin (320mW vs. 174mW). |
| TPS3808G12DBVR | TI part with 1.2V threshold (not 2.5V); push-pull output; 1.6µA ICC; 200ms timeout; same SC70-3 package. | Not a direct functional match - requires redesign of reset logic due to active-high push-pull output and different threshold. | Choose only if redesigning for 1.2V supply monitoring or needing longer timeout; not drop-in for MAX6328XR25's 2.5V open-drain role. |
Compared with MAX6328XR25, the MAX6328UR25-T offers identical supervision performance in a mechanically distinct but pin-compatible SOT23 package, while the TPS3808G12DBVR serves a different voltage domain and interface architecture - making MAX6328XR25 uniquely suited for space-constrained 2.5V open-drain reset applications.
Availability
MAX6328XR25 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6328XR25 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 industrial, computing, and communications markets, with emphasis on power efficiency, integration, and reliability.
The MAX6326/MAX6327/MAX6328 family targets ultra-low-power microprocessor supervision in battery-critical and space-constrained systems, delivering precision voltage monitoring and robust reset timing without external components.
FAQ
What is the exact reset threshold voltage of MAX6328XR25?
The MAX6328XR25 has a factory-trimmed nominal reset threshold of 2.500V, with tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the official datasheet under suffix "R25", and applies specifically to the MAX6328XR25 variant - not inferred from adjacent thresholds.
Does MAX6328XR25 support bidirectional reset interfaces?
Yes, MAX6328XR25 supports bidirectional reset interfaces via its open-drain RESET output (Pin 2). When paired with an external pull-up resistor, it allows both the MAX6328XR25 and a microcontroller (e.g., Motorola 68HC11) to drive the same reset line - a capability explicitly documented in the Applications Information section of the datasheet.
What package type and markings identify MAX6328XR25?
MAX6328XR25 is supplied in a 3-pin SC70-3 package (outline X3-2) with top-side marking "FQAA". This marking is verified in Table 2 of the datasheet under "MAX6328_R25-T" for SC70 packaging, and distinguishes it from the SOT23-3 variant (MAX6328UR25-T, marked "FQAA" but in U3-1 outline).
How long does the reset signal remain active after VCC rises above threshold?
The MAX6328XR25 guarantees a minimum reset timeout of 100ms after VCC rises above the 2.500V threshold, with typical values ranging from 100ms to 280ms depending on temperature and unit variation. This is specified in the Electrical Characteristics table under "Reset Active Timeout Period" and is a hard guarantee - not a typical-only parameter.
Is MAX6328XR25 compatible with 1.2V VCC operation?
Yes, MAX6328XR25 is fully specified to operate with VCC as low as 1.2V across the full -40°C to +85°C temperature range. This enables reliable reset assertion during deep brownout conditions where other supervisors cease functioning - a key specification confirmed in the "VCC Range" row of the Electrical Characteristics table.
MAX6328XR25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.5V
- 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:
- SC-70-3
MAX6328XR25 FAQ
1.How can I place an order for MAX6328XR25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328XR25 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 MAX6328XR25 reliable?
The price and inventory of MAX6328XR25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328XR25 is usually 5 days.
3.What payment methods are accepted for MAX6328XR25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328XR25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328XR25?
MAX6328XR25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328XR25 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 MAX6328XR25?
For technical support, including MAX6328XR25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328XR25 requirements.
6.How does Aetrix verify that MAX6328XR25 is sourced from the original manufacturer or authorized distributors?
All MAX6328XR25 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 MAX6328XR25 meets industry standards.
7.What is the process for return or replacement of MAX6328XR25?
All MAX6328XR25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328XR25, 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 MAX6328XR25 part is unused and in its original packaging.
Return procedure for MAX6328XR25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6328XR25 Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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