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Analog Devices Inc./Maxim Integrated MAX6326UR28+
- Part No.:
- MAX6326UR28+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6326UR28+.pdf
- Description:
- MAX6326 3-PIN, ULTRA-LOW-POWER S
- Quantity:
- Payment:
- Shipping:
Inventory:6,282
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Product details
Overview
MAX6326UR28+ from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.8V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 2.8V reset threshold (±1.5% at +25°C), 100ms minimum reset timeout, 1µA max supply current, and operates over –40°C to +85°C - used in portable battery-powered controllers and embedded systems requiring reliable power-on reset.
For engineers reviewing the MAX6326UR28+ datasheet, MAX6326UR28+ pinout, MAX6326UR28+ application, or MAX6326UR28+ equivalent, key selection criteria include its SOT23-3 open-drain–incompatible push-pull output, guaranteed reset assertion down to VCC = 1V, immunity to fast VCC transients, and compatibility with 2.5V/3V/3.3V/5V supply domains.
Technical Context
The MAX6326UR28+ uses a precision bandgap-based voltage comparator with internal hysteresis (9.5mV typical) to detect when VCC falls below its 2.8V threshold. Reset remains asserted for ≥100ms after VCC rises above threshold, ensuring stable µP initialization.
Its push-pull RESET output drives low actively (VOL ≤ 0.4V @ ISINK = 1.6mA) and high passively (VOH ≥ 0.8·VCC @ ISOURCE = 500µA), eliminating external pull-up resistors. The device ignores transients <20µs at 100mV overdrive, enhancing noise immunity in noisy power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.8V ±1.5% at +25°C; ensures reliable detection of 2.8V supply droop before system malfunction. |
| Supply Current | 1µA max at +25°C; enables multi-year battery life in always-on portable instrumentation. |
| Reset Timeout | 100ms min power-up delay; guarantees sufficient hold time for slow-ramping µP clock and memory initialization. |
| Operating Temp | –40°C to +85°C; qualified for industrial and automotive under-hood environments without derating. |
| VCC Range | 1.0V to 5.5V; supports reset assertion even during deep brownout or partial power loss. |
| Output Type | Active-low push-pull; drives RESET line directly without external pull-up, simplifying PCB layout. |
| Transient Immunity | Rejects VCC glitches <20µs at 100mV overdrive; prevents false resets in electrically noisy systems. |
Pinout & Package
MAX6326UR28+ is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), 2.92mm × 1.3mm footprint, 1.0mm height, lead-free (RoHS-compliant) construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane for accurate threshold sensing. |
| 2 - RESET | Active-low push-pull output | Drives low during reset (VOL ≤ 0.4V); drives high (VOH ≥ 0.8·VCC) otherwise; interfaces directly with µP reset input. |
| 3 - VCC | Supply input | Monitored power rail input; powers internal circuitry and defines reset threshold reference; functional down to 1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year coin-cell operation in remote sensors and wearables. |
| Precision 2.8V threshold | Factory-trimmed to ±1.5% at +25°C; eliminates manual calibration and external resistor dividers. |
| 100ms min reset pulse | Guaranteed hold time meets ARM Cortex-M and PIC MCU power-on timing requirements. |
| VCC transient rejection | Immune to sub-20µs negative glitches - critical in automotive stop-start and motor-drive systems. |
| No external components | Single-chip solution replaces discrete R/C reset networks, reducing BOM count and board area by 70%. |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: Power cycling during field firmware updates in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Supervises 2.8V I/O expander supply and asserts synchronous reset to ARM-based main controller. Use Value: Prevents partial register writes and state corruption during 2.8V rail instability, ensuring deterministic boot recovery. |
Use Scenario: Battery-backed ECG acquisition unit operating on CR2032 coin cell with intermittent charging. IC Role / Device Role / Timing Role: Monitors 2.8V LDO output powering analog front-end and BLE SoC; triggers hard reset on voltage sag. Use Value: 1µA quiescent current extends usable battery life to 36 months; 100ms reset ensures ADC calibration completes before data capture. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: Cold-cranking event where 12V battery dips to 6V, causing 2.8V domain to collapse transiently. IC Role / Device Role / Timing Role: Detects 2.8V rail collapse and holds microcontroller in reset until stable post-cranking. Use Value: Push-pull output delivers robust drive strength (1.6mA sink) to overcome CAN transceiver input capacitance and noise coupling. |
Use Scenario: Tamper-resistant meter with backup supercapacitor maintaining real-time clock and metrology core during mains outage. IC Role / Device Role / Timing Role: Supervises 2.8V backup rail; asserts reset if supercap voltage drops below safe operating level. Use Value: Guaranteed operation down to VCC = 1.0V allows reset assertion even as supercap discharges to end-of-life voltage (≈1.2V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR28+T | Same 2.8V threshold, but 2.5µA max ICC and no guaranteed operation below 1.2V. | Lacks deep-brownout support; unsuitable for systems requiring reset assertion below 1.2V. | Select MAX809TR28+T only if supply never drops below 1.2V and 1µA ICC is not required. |
| TPS3808G33DBVR | 3.3V fixed threshold; adjustable version requires external resistor; 1.8µA ICC; 200ms default timeout. | Not pin-compatible; requires redesign for 2.8V monitoring; longer timeout may delay system startup. | Choose TPS3808G33DBVR only when migrating to TI ecosystem and 200ms reset hold is acceptable. |
Compared with MAX809TR28+T and TPS3808G33DBVR, the MAX6326UR28+ uniquely combines 2.8V precision, 1µA ICC, and 1V operational floor - enabling fail-safe reset in ultra-low-power and deep-brownout scenarios where alternatives cannot guarantee assertion.
Availability
MAX6326UR28+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6326UR28+ 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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX6326UR28+ belongs to Maxim's µP supervisory circuit product line, engineered specifically for low-power, high-reliability reset supervision in space-constrained and battery-sensitive systems.
FAQ
What is the exact reset threshold voltage of MAX6326UR28+ and how tightly is it specified?
The MAX6326UR28+ has a factory-trimmed reset threshold of 2.80V, with a tolerance of ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C temperature range. This specification is guaranteed by design and verified per Maxim's production test flow, ensuring consistent brownout detection across environmental conditions without external calibration.
Does MAX6326UR28+ support operation below 1.2V, and why does that matter?
Yes, MAX6326UR28+ is fully functional and guarantees correct reset assertion down to VCC = 1.0V - critical for systems using supercapacitors or aging batteries where supply voltage decays below 1.2V before shutdown. This capability ensures deterministic reset behavior in deep brownout events where competing supervisors (e.g., MAX809) cease operation.
Is MAX6326UR28+ pin-compatible with MAX803/MAX809/MAX810 series devices?
Yes, MAX6326UR28+ uses identical SOT23-3 pinout (GND–RESET–VCC) and is explicitly stated in the datasheet as pin compatible with MAX803/MAX809/MAX810. No PCB layout changes are required when upgrading to achieve lower supply current or extended VCC operating range.
What is the maximum transient duration MAX6326UR28+ can ignore on the VCC line?
At 100mV of reset threshold overdrive (i.e., VCC = VTH – 100mV = 2.7V), MAX6326UR28+ rejects transients up to 20µs in duration, as confirmed by the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph in the datasheet. This immunity prevents false resets caused by switching noise or load dump spikes.
Can MAX6326UR28+ drive a reset input requiring 2.5mA sink current?
Yes - MAX6326UR28+'s push-pull RESET output guarantees VOL ≤ 0.4V while sinking up to 3.2mA (per datasheet, ISINK = 3.2mA condition), comfortably exceeding 2.5mA requirement. This ensures valid logic-low signaling even under worst-case VCC and temperature conditions.
MAX6326UR28+ 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:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.8V
- 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
MAX6326UR28+ FAQ
1.How can I place an order for MAX6326UR28+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326UR28+ 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 MAX6326UR28+ reliable?
The price and inventory of MAX6326UR28+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326UR28+ is usually 5 days.
3.What payment methods are accepted for MAX6326UR28+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326UR28+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326UR28+?
MAX6326UR28+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326UR28+ 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 MAX6326UR28+?
For technical support, including MAX6326UR28+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326UR28+ requirements.
6.How does Aetrix verify that MAX6326UR28+ is sourced from the original manufacturer or authorized distributors?
All MAX6326UR28+ 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 MAX6326UR28+ meets industry standards.
7.What is the process for return or replacement of MAX6326UR28+?
All MAX6326UR28+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326UR28+, 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 MAX6326UR28+ part is unused and in its original packaging.
Return procedure for MAX6326UR28+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6326UR28+ Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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