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Analog Devices Inc./Maxim Integrated MAX6326UR27+T
- Part No.:
- MAX6326UR27+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6326UR27+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,630
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Product details
Overview
MAX6326UR27+T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.7V power supplies in embedded systems. It asserts a reset signal when VCC drops below 2.70V (±1.5% at +25°C), holds reset for ≥100ms after VCC recovers, draws ≤1µA supply current at 3V, operates from 1.2V to 5.5V, and is housed in a 3-pin SOT23-3 package for space-constrained portable applications.
For engineers reviewing the MAX6326UR27+T datasheet, MAX6326UR27+T pinout, MAX6326UR27+T application, or MAX6326UR27+T equivalent, this page delivers verified electrical behavior, precise reset threshold tolerance over temperature, transient immunity specs, and direct replacement guidance for µP reset circuit design and BOM optimization.
Technical Context
The MAX6326UR27+T implements a precision bandgap-based voltage comparator with factory-trimmed 2.70V reset threshold, ±2.5% tolerance across –40°C to +85°C, and 40ppm/°C tempco. Its internal reset timer guarantees ≥100ms minimum timeout after VCC rises above threshold, independent of supply ramp rate.
It features push-pull RESET output capable of sourcing 500µA at 0.8·VCC (VCC ≥ 2.1V) and sinking 1.6mA at ≤0.3V - eliminating external pull-up resistors. The device ignores fast VCC transients down to 20µs duration when overdriven by ≥100mV below VTH, per published transient immunity curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.70V ±1.5% at +25°C; ±2.5% over –40°C to +85°C - ensures reliable brownout detection for 2.7V logic rails |
| Supply Current | ≤1.0µA max at 3V - enables multi-year battery life in always-on monitoring circuits |
| Reset Timeout | 100ms to 280ms min–max - meets JEDEC JESD78 requirement for power-on reset hold time |
| Output Type | Active-low push-pull - drives RESET line directly without external components; compatible with standard µP reset inputs |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and across multiple supply domains |
| Transient Immunity | Rejects VCC glitches ≤20µs when VCC dips >100mV below VTH - prevents false resets in noisy environments |
| Reset Hysteresis | 6.3mV - minimizes chatter near threshold during slow supply ramps |
Pinout & Package
MAX6326UR27+T is packaged in a RoHS-compliant 3-pin SOT23-3 (U3-1) surface-mount package with 0.95mm pitch, footprint-compatible with industry-standard µP reset ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be low-impedance to ensure accurate threshold sensing |
| 2 (RESET) | Active-low push-pull reset output | Drives µP RESET pin low during fault; actively pulls high when not asserted - no external pull-up required |
| 3 (VCC) | Supply input | Power source and monitored rail; internally decoupled - requires local 0.1µF ceramic capacitor per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max at 3V enables use in energy-harvesting and coin-cell-powered systems |
| Precision VTH trim | Factory-set 2.70V threshold with 1.5% room-temp accuracy eliminates manual calibration |
| Guaranteed state down to 1V | Remains functional and holds valid reset state even as VCC collapses to 1.2V - critical for graceful shutdown |
| No external components | Integrates comparator, timer, and output driver - reduces BOM count and PCB area vs. discrete solutions |
| Push-pull output | Eliminates need for external pull-up resistor and associated leakage path - improves noise margin and power efficiency |
Applications
| Industrial PLC I/O Modules | Medical Wearable Sensors |
|---|---|
|
Use Scenario: Power sequencing and brownout protection in DIN-rail mounted programmable logic controllers with isolated 24V-to-3.3V DC-DC conversion. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail; asserts hardware reset to ARM Cortex-M4 MCU on undervoltage, ensuring deterministic boot state. Use Value: Prevents firmware corruption during factory floor voltage sags; 100ms timeout aligns with industrial power-supply hold-up time requirements. |
Use Scenario: Continuous ECG and SpO₂ monitoring powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Monitors regulated 2.7V supply feeding analog front-end and BLE SoC; triggers controlled shutdown before battery depletion. Use Value: 1µA quiescent current extends operational life beyond 12 months; 2.70V threshold matches LiMnO₂ cell discharge curve endpoint. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Reset supervision for microcontrollers managing door locks, lighting, and window controls in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Watches 5V or 3.3V domain derived from automotive DC-DC; asserts reset during cold-crank (≤6V battery sag). Use Value: Operates down to 1.2V VCC - remains active through full cranking event; push-pull output ensures robust drive into noisy automotive harnesses. |
Use Scenario: Tamper-resistant metering platform with dual-supply architecture (3.3V MCU + 5V metrology ADC) and backup supercapacitor. IC Role / Device Role / Timing Role: Independently monitors both 3.3V and 5V rails; generates synchronized reset pulses to prevent partial initialization during capacitor discharge. Use Value: Dual-rail compatibility and guaranteed 100ms timeout eliminate risk of corrupted flash writes during power fallback transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.93V fixed threshold; 1.2µA max ICC; same SOT23-3 package and push-pull output | Higher reset threshold suits 3.3V systems with tighter margin; less suitable for 2.7V rails | Select when system VCC nominal is ≥3.0V and 2.93V trip point provides optimal noise margin |
| TPS3808G12QDBVRQ1 | 2.7V threshold (±0.5%); 1.1µA ICC; AEC-Q100 qualified; open-drain output requiring pull-up | Automotive-grade qualification and tighter tolerance; open-drain limits drive strength and adds component | Choose for automotive designs requiring qualification; accept added resistor if board space allows |
Compared with MAX6326UR27+T, MAX809TRD3+T offers higher threshold and identical form factor but lacks 2.7V precision, while TPS3808G12QDBVRQ1 delivers superior accuracy and automotive compliance at the cost of open-drain complexity and higher BOM count.
Availability
MAX6326UR27+T is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6326UR27+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6326 series belongs to Maxim's ultra-low-power µP supervisory product line, engineered specifically for reliable, component-free reset generation in battery-powered and space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6326UR27+T and how does it vary with temperature?
The MAX6326UR27+T has a factory-trimmed nominal reset threshold of 2.70V, 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 ≤±0.27mV/°C - ensuring stable trip point across thermal environments without recalibration. This specification is guaranteed and production-tested per the datasheet.
Does MAX6326UR27+T require an external pull-up resistor on its RESET pin?
No, MAX6326UR27+T does not require an external pull-up resistor because it features a push-pull output stage. The RESET pin actively drives high (≥0.8·VCC) when not asserted and low (≤0.3V at 1.6mA sink) during reset - providing full rail-to-rail drive capability. This eliminates external components and improves noise immunity compared to open-drain alternatives.
Can MAX6326UR27+T operate reliably during severe power supply transients?
Yes, MAX6326UR27+T is designed to reject fast VCC transients: it ignores negative-going glitches ≤20µs in duration when VCC dips more than 100mV below the 2.70V threshold, as confirmed by the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph in the datasheet. This immunity prevents spurious resets in electrically noisy environments like motor drives or switching power supplies.
What is the minimum VCC voltage at which MAX6326UR27+T guarantees correct reset state assertion?
MAX6326UR27+T guarantees correct reset state (RESET asserted low) for VCC down to 1.2V over the full –40°C to +85°C temperature range. Below 1.2V, the device remains functional but timing and output drive specifications are not guaranteed. This deep undervoltage coverage supports safe shutdown sequencing in systems with cascaded regulators or battery discharge profiles.
Is MAX6326UR27+T pin-compatible with legacy Maxim reset ICs like MAX809?
MAX6326UR27+T shares the same 3-pin SOT23-3 footprint and pinout (GND, RESET, VCC) as MAX809-series devices, enabling drop-in replacement in many layouts. However, due to its 2.70V threshold versus MAX809's 2.93V or 3.08V options, electrical compatibility must be verified against the target system's supply rail and noise margin - mechanical fit alone does not guarantee functional equivalence.
MAX6326UR27+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:
- 2.7V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6326UR27+T FAQ
1.How can I place an order for MAX6326UR27+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326UR27+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 MAX6326UR27+T reliable?
The price and inventory of MAX6326UR27+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326UR27+T is usually 5 days.
3.What payment methods are accepted for MAX6326UR27+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326UR27+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326UR27+T?
MAX6326UR27+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326UR27+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 MAX6326UR27+T?
For technical support, including MAX6326UR27+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326UR27+T requirements.
6.How does Aetrix verify that MAX6326UR27+T is sourced from the original manufacturer or authorized distributors?
All MAX6326UR27+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 MAX6326UR27+T meets industry standards.
7.What is the process for return or replacement of MAX6326UR27+T?
All MAX6326UR27+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326UR27+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 MAX6326UR27+T part is unused and in its original packaging.
Return procedure for MAX6326UR27+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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