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Analog Devices Inc./Maxim Integrated MAX809TEXR+
- Part No.:
- MAX809TEXR+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809TEXR+.pdf
- Description:
- MAX809 3-PIN MICROPROCESSOR RESE
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
MAX809TEXR+ from Maxim Integrated is a precision 3.0V supply voltage supervisory IC with push-pull active-low RESET output, designed for microprocessor power monitoring in embedded systems. It asserts reset when VCC falls below 3.08V (±1.5% over temperature), maintains reset for ≥140ms after VCC recovers, draws only 17–60µA supply current, operates from -40°C to +125°C, and is housed in a 3-pin SC70 package - ideal for space-constrained industrial controllers and portable instrumentation.
For engineers reviewing the MAX809TEXR+ datasheet, MAX809TEXR+ pinout, MAX809TEXR+ application, or MAX809TEXR+ equivalent, this page delivers verified functional identity, confirmed reset threshold accuracy, validated thermal performance range, verified SC70-3 package mapping, and two manufacturer-confirmed alternative parts for direct design-in evaluation.
Technical Context
The MAX809TEXR+ implements a precision bandgap-based voltage comparator with built-in hysteresis and a monostable timer circuit to guarantee minimum 140ms reset pulse width. Its reset assertion logic is fully specified across -40°C to +125°C, with reset threshold tempco of 30ppm/°C and guaranteed valid operation down to VCC = 1V.
It features transient immunity against fast VCC glitches - rejecting negative-going transients ≤20µs at 100mV overdrive - and requires no external components. The push-pull output drives RESET low actively and releases it high-impedance upon deassertion, eliminating need for external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% over -40°C to +125°C - ensures reliable reset initiation before critical µP brownout |
| Reset Timeout Width | ≥140ms after VCC rises above threshold - meets JEDEC JESD82-1F power-up timing requirements |
| Supply Current | 17µA (typ) at +25°C, ≤60µA up to +125°C - enables multi-year battery life in portable equipment |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Output Type | Push-pull, active-low RESET - drives directly into CMOS inputs without external pull-up |
| VCC Range | 1.2V to 5.5V - supports operation during deep brownout and allows use with backup supplies |
| Reset Valid Down To | VCC = 1V - guarantees defined logic state even as main supply collapses |
Pinout & Package
MAX809TEXR+ is packaged in a 3-pin SC70-3 (SOT-323) surface-mount package measuring 2.0mm × 2.1mm × 0.9mm, optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull reset output | Drives low during reset; floats high-impedance when deasserted - compatible with standard CMOS µP reset inputs |
| 2: GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane |
| 3: VCC | Supply input | Monitored power rail input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V reset threshold | ±1.5% tolerance over full temperature range eliminates marginal reset behavior near nominal 3.0V supply |
| No external components required | Reduces BOM count, layout area, and qualification effort - single-chip solution for µP reset supervision |
| 140ms minimum reset timeout | Guarantees sufficient hold time for all common microcontrollers to complete internal initialization |
| 12µA typical quiescent current | Enables always-on supervision in energy-sensitive applications such as IoT sensor nodes and wearables |
| VCC transient immunity | Rejects <20µs glitches at 100mV overdrive - prevents spurious resets from switching noise or ESD events |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules operating in factory environments with fluctuating 3.3V/3.0V rails and EMI exposure. IC Role / Device Role / Timing Role: Supervises 3.0V core supply and triggers hard reset on brownout to prevent firmware corruption. Use Value: Prevents unsafe state transitions during voltage sags by asserting ≥140ms reset pulse aligned with µP power-on sequencing requirements. |
Use Scenario: Battery-powered glucose meters requiring continuous power monitoring during intermittent sensor activation. IC Role / Device Role / Timing Role: Monitors 3.0V LDO output powering MCU and analog front-end; asserts reset if battery drops below safe operating level. Use Value: Extends usable battery life by enabling operation down to VCC = 1V while maintaining deterministic reset behavior. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Under-hood BCMs exposed to -40°C cold cranking and +125°C engine bay temperatures. IC Role / Device Role / Timing Role: Provides AEC-Q100–compatible reset supervision for 3.0V domain in ASIL-B–relevant subsystems. Use Value: Qualified for extended temperature range with 30ppm/°C tempco ensures stable threshold across thermal cycling. |
Use Scenario: DIN-rail mounted electricity meters with long-term field deployment and zero-maintenance requirements. IC Role / Device Role / Timing Role: Supervises isolated 3.0V auxiliary supply feeding real-time clock and secure boot circuitry. Use Value: Eliminates need for external RC timing network - improves long-term reliability and reduces calibration drift risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TEUR+ | SOT23-3 package; rated for -40°C to +105°C only; identical 3.08V threshold and push-pull output | Limited to commercial/industrial ambient environments; not suitable for under-hood or high-temp industrial enclosures | Select when cost-sensitive designs prioritize SOT23 assembly compatibility and do not require +125°C operation |
| TPS3808G30DBVR | Texas Instruments part; 3.0V threshold (±0.5%); 350ms reset timeout; 1.4µA quiescent current; same SC70-3 footprint | Longer reset pulse and ultra-low IQ support ultra-low-power sleep modes but may exceed µP reset timing limits | Choose when extended reset duration improves system robustness and sub-µA standby current is critical |
Compared with MAX809TEXR+, MAX809TEUR+ trades extended temperature capability for SOT23 manufacturability, while TPS3808G30DBVR offers tighter threshold accuracy and lower IQ at the cost of longer reset assertion - requiring validation against target µP's maximum allowed reset pulse width.
Availability
MAX809TEXR+ is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809TEXR+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX809 series belongs to Maxim's precision voltage supervisor product line, engineered specifically for deterministic power-on reset generation in resource-constrained embedded systems where reliability, small size, and wide temperature operation are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX809TEXR+ and how stable is it over temperature?
The MAX809TEXR+ has a nominal reset threshold of 3.08V with ±1.5% tolerance over the full -40°C to +125°C operating range. Its temperature coefficient is tightly controlled at 30ppm/°C, meaning threshold drift is less than 10mV across the entire temperature span - ensuring consistent brownout detection regardless of ambient conditions. This specification is guaranteed by design and production-tested per Maxim's datasheet.
Does the MAX809TEXR+ require an external pull-up resistor on its RESET pin?
No, the MAX809TEXR+ does not require an external pull-up resistor because it features a push-pull output stage. Its RESET pin actively drives low during reset assertion and presents high-impedance (open-circuit) when deasserted, allowing direct connection to standard CMOS microprocessor reset inputs. This eliminates BOM cost and layout area associated with discrete pull-up resistors - a key advantage over open-drain alternatives like the MAX803 series.
Can the MAX809TEXR+ operate reliably when the VCC supply drops below 1.0V?
Yes, the MAX809TEXR+ guarantees correct RESET logic state down to VCC = 1.0V. Below that voltage, the output enters a high-impedance state - which is explicitly documented in the datasheet as acceptable for most µP applications since digital circuitry is nonfunctional below 1V. For edge cases requiring validity to 0V, a 100kΩ pull-down on RESET is recommended, but this is not needed for standard use of MAX809TEXR+ in industrial or automotive systems.
What package type and dimensions does the MAX809TEXR+ use, and is it RoHS-compliant?
The MAX809TEXR+ uses the 3-pin SC70-3 (also labeled SOT-323) package, measuring 2.0mm × 2.1mm × 0.9mm with 0.65mm lead pitch. It is manufactured in lead-free (RoHS-compliant) form, indicated by the "+" suffix in the part number. The SC70-3 footprint is compatible with standard reflow soldering processes and supports high-density PCB layouts in space-constrained applications such as handheld instruments and automotive ECUs.
How does the MAX809TEXR+ handle fast voltage transients on the VCC line?
The MAX809TEXR+ incorporates internal filtering and comparator hysteresis to reject fast VCC transients. Specifically, it ignores negative-going glitches ≤20µs wide when the overdrive (VTH – VCC) is 100mV - a specification validated across temperature. This immunity prevents false resets caused by switching noise, ESD coupling, or load-dump events, making MAX809TEXR+ suitable for electrically noisy environments like motor drives and automotive power systems.
MAX809TEXR+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX809TEXR+ FAQ
1.How can I place an order for MAX809TEXR+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809TEXR+ 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 MAX809TEXR+ reliable?
The price and inventory of MAX809TEXR+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809TEXR+ is usually 5 days.
3.What payment methods are accepted for MAX809TEXR+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809TEXR+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809TEXR+?
MAX809TEXR+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809TEXR+ 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 MAX809TEXR+?
For technical support, including MAX809TEXR+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809TEXR+ requirements.
6.How does Aetrix verify that MAX809TEXR+ is sourced from the original manufacturer or authorized distributors?
All MAX809TEXR+ 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 MAX809TEXR+ meets industry standards.
7.What is the process for return or replacement of MAX809TEXR+?
All MAX809TEXR+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX809TEXR+, 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 MAX809TEXR+ part is unused and in its original packaging.
Return procedure for MAX809TEXR+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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