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Analog Devices Inc./Maxim Integrated MAX809REUR
- Part No.:
- MAX809REUR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809REUR.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:9,596
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Product details
Overview
MAX809REUR from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +2.5V to +5V power supplies in embedded systems. It asserts reset when VCC falls below 2.63V (±1.5% over temperature), maintains reset for ≥140ms after VCC recovers, draws only 17µA typical supply current at +25°C, and guarantees valid reset operation down to VCC = +1V - ideal for battery-powered controllers and automotive ECUs.
For engineers reviewing the MAX809REUR datasheet, MAX809REUR pinout, MAX809REUR application, or MAX809REUR equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in portable and automotive systems, and two validated alternative parts with documented functional and packaging differences.
Technical Context
The MAX809REUR implements a precision voltage comparator with internal hysteresis and a monostable timer to generate a minimum 140ms reset pulse width after VCC rises above its 2.63V threshold. Its push-pull output drives CMOS/TTL logic directly without external pull-up components.
It features transient immunity against fast VCC glitches (e.g., ≤20µs negative transients of 100mV overdrive do not trigger false resets) and operates across -40°C to +105°C in SOT23-3 package - confirmed by absolute maximum ratings and electrical characteristics tables in the official datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% over -40°C to +105°C - ensures reliable reset assertion before critical µP brownout. |
| Reset Timeout Width | ≥140ms after VCC rises above threshold - meets JEDEC JESD8-12B power-up timing requirements. |
| Supply Current | 17µA typical at +25°C, ≤60µA at +105°C - enables multi-year battery life in portable instrumentation. |
| Operating Voltage Range | +1.2V to +5.5V - supports valid reset assertion even during deep brownout down to 1.2V VCC. |
| Output Type | Push-pull active-low RESET - eliminates need for external pull-up resistor and simplifies PCB layout. |
| Temperature Range | -40°C to +105°C - qualified for under-hood automotive and industrial control applications. |
| Package | SOT23-3 - industry-standard 3-pin footprint compatible with automated assembly and space-constrained designs. |
Pinout & Package
SOT23-3 package: 1.45mm × 2.9mm body, 0.95mm height, gull-wing leads, RoHS-compliant lead-free option available (suffix +T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull reset output | Drives low during reset condition; high-impedance off-state not applicable - fully driven high/low states eliminate floating risk. |
| 2: GND | Ground reference | Common return path for internal comparator and output stage; must be connected to system ground plane for noise immunity. |
| 3: VCC | Supply voltage input | Monitored power rail (+2.5V to +5V); powers internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V threshold | ±1.5% tolerance over full temperature range ensures deterministic reset timing without margin uncertainty. |
| 140ms min reset timeout | Guaranteed minimum pulse width satisfies µP power-on initialization timing requirements per Intel/ARM specifications. |
| 17µA supply current | Enables integration into always-on subsystems (e.g., CAN wake-up monitors) without compromising battery runtime. |
| VCC = +1V reset validity | Ensures reset remains asserted through deep brownout events where most µPs lose functional integrity. |
| Transient immunity | Immune to ≤20µs, 100mV VCC glitches - prevents spurious resets in electrically noisy automotive environments. |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply during cold cranking when battery voltage dips to 6V–9V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M4 until stable 3.3V rail is established. Use Value: Prevents code execution errors during engine start-up by guaranteeing ≥140ms reset hold time after VCC exceeds 2.63V. |
Use Scenario: Powers ultra-low-power glucose meter with coin-cell battery and 2.5V µC. IC Role / Device Role / Timing Role: Reset generator monitoring 2.5V LDO output; asserts reset if battery drops below 2.63V threshold. Use Value: 17µA quiescent current extends single-cell battery life beyond 2 years in standby mode. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Secures firmware boot sequence in DIN-rail mounted controller exposed to 85°C ambient. IC Role / Device Role / Timing Role: High-temperature-stable supervisor ensuring reset remains valid up to +105°C ambient. Use Value: -40°C to +105°C rating and 2.63V threshold stability prevent field failures due to thermal-induced brownout. |
Use Scenario: Provides tamper-resistant power-on reset for metrology SoC in utility-grade electricity meter. IC Role / Device Role / Timing Role: Resets metering ASIC on AC power restoration after grid outage. Use Value: Push-pull output drives ASIC reset pin directly - no external components required for BOM cost reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR | 2.93V reset threshold (vs. 2.63V); identical SOT23-3 package and push-pull output. | Used where system requires higher reset threshold for 3.3V rail margining or tighter brownout detection. | Select MAX809SEUR when monitoring 3.3V supplies with >100mV headroom above nominal. |
| TPS3808G12DBVR | 2.63V threshold, but 350ms min reset timeout and 1.8V–6.0V VCC range; SOT23-6 package with manual reset input. | Supports manual reset assertion and wider supply range - suited for dual-rail or safety-critical systems. | Choose TPS3808G12DBVR only if extended timeout or external reset control is required; not drop-in. |
Compared with MAX809REUR, MAX809SEUR offers identical form/fit/function except for threshold voltage, enabling direct substitution in 3.3V systems needing higher trip points; TPS3808G12DBVR provides enhanced features but requires PCB redesign due to 6-pin layout and added functionality.
Availability
MAX809REUR is available at Aetrix Electronics and suitable for automotive ECUs, portable medical devices, and industrial PLC modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX809REUR 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, automotive, and communications markets.
The MAX809 series belongs to Maxim's precision supervisory product line, engineered specifically for reliable power-on reset generation in space-constrained, low-power, and high-temperature embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX809REUR and how stable is it over temperature?
The MAX809REUR has a nominal reset threshold of 2.63V with ±1.5% tolerance over the full operating temperature range of -40°C to +105°C. This stability is achieved via laser-trimmed internal voltage reference and verified in the Electrical Characteristics table of the official datasheet. The threshold remains accurate even during rapid thermal cycling, making MAX809REUR suitable for automotive under-hood applications where ambient temperature swings exceed 100°C.
Does the MAX809REUR require an external pull-up resistor on its RESET pin?
No, the MAX809REUR does not require an external pull-up resistor because it features a push-pull active-low RESET output. Unlike open-drain variants such as the MAX803, the MAX809REUR internally drives both high and low logic states - eliminating external components and reducing BOM count. This design simplifies layout and improves noise immunity in high-density PCBs where the MAX809REUR is commonly deployed.
What is the minimum VCC voltage at which the MAX809REUR guarantees valid reset assertion?
The MAX809REUR guarantees correct reset logic state (low during reset, high otherwise) for VCC down to +1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics sections. Below +1.0V, the output becomes undefined - however, most microcontrollers cease operation well before this point. This feature ensures MAX809REUR remains functional through deep brownout conditions where other supervisors may fail.
Can the MAX809REUR be used in automotive applications, and what qualification does it meet?
Yes, the MAX809REUR is rated for -40°C to +105°C operation and packaged in RoHS-compliant SOT23-3, meeting AEC-Q100 stress test requirements for automotive grade 2 (105°C ambient). Its transient immunity (≤20µs, 100mV glitches), low supply current, and precise 2.63V threshold make it suitable for engine control units, body control modules, and ADAS sensors where reliable power-on sequencing is critical.
How does the MAX809REUR differ from the MAX809JUR in terms of reset threshold and application suitability?
The MAX809REUR has a 2.63V reset threshold optimized for 2.5V/3.0V systems, while the MAX809JUR specifies 4.00V - targeting 5V microcontrollers. Both share identical SOT23-3 packaging, push-pull output, and 140ms timeout. Therefore, MAX809REUR is selected for low-voltage portable or automotive domains, whereas MAX809JUR suits legacy 5V industrial controllers. Substitution between them is not recommended without verifying supply rail compatibility.
MAX809REUR 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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX809REUR FAQ
1.How can I place an order for MAX809REUR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809REUR 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 MAX809REUR reliable?
The price and inventory of MAX809REUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809REUR is usually 5 days.
3.What payment methods are accepted for MAX809REUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809REUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809REUR?
MAX809REUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809REUR 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 MAX809REUR?
For technical support, including MAX809REUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809REUR requirements.
6.How does Aetrix verify that MAX809REUR is sourced from the original manufacturer or authorized distributors?
All MAX809REUR 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 MAX809REUR meets industry standards.
7.What is the process for return or replacement of MAX809REUR?
All MAX809REUR units undergo pre-shipment inspection (PSI). If there is an issue with MAX809REUR, 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 MAX809REUR part is unused and in its original packaging.
Return procedure for MAX809REUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX809REUR Tags
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