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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:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:12,090
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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 recovery, draws only 17–60µA supply current, and operates from -40°C to +125°C in SC70-3 package - ideal for industrial controllers and portable equipment requiring reliable brownout protection.
For engineers reviewing the MAX809TEXR datasheet, MAX809TEXR pinout, MAX809TEXR application, or MAX809TEXR equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in Maxim's official specifications for the EXR-grade SC70 variant.
Technical Context
The MAX809TEXR integrates a precision bandgap-based voltage comparator with hysteresis-free threshold detection and a monostable timer circuit. Its reset assertion logic is triggered solely by VCC crossing the 3.08V threshold, with no external timing components required. The internal timer guarantees minimum 140ms reset pulse width after VCC rises above threshold, independent of supply ramp rate.
It features guaranteed RESET validity down to VCC = 1.0V, immunity to fast VCC transients (e.g., ≤20µs glitches at 100mV overdrive), and push-pull output capable of sinking 3.2mA or sourcing 800µA - enabling direct interface with standard CMOS µP reset inputs without pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% over -40°C to +125°C - ensures deterministic reset before critical µP operation fails at 3.0V nominal supply |
| Reset Timeout Width | ≥140ms (min) after VCC rise - provides sufficient time for power stabilization and µP internal initialization |
| Supply Current | 17µA (typ) at +25°C, ≤60µA at +125°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 conditions |
| Output Type | Push-pull active-low RESET - eliminates need for external pull-up resistor and ensures fast, rail-to-rail logic transitions |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Validity Limit | Guaranteed down to VCC = 1.0V - prevents floating reset state during final power collapse phase |
Pinout & Package
MAX809TEXR is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm), optimized for high-density PCB layouts and reflow-compatible assembly. Pin 1 is RESET, Pin 2 is GND, Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; sinks 3.2mA at VCC ≥ 3.0V; no external pull-up needed |
| 2 - GND | Analog and digital ground reference | Must be connected to system ground plane with low-inductance path to minimize noise coupling into threshold comparator |
| 3 - VCC | Supply voltage input | Monitored power rail; also powers internal circuitry; accepts 1.2V–5.5V with full functionality |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V reset threshold | ±1.5% tolerance over full -40°C to +125°C range - eliminates design margin uncertainty in 3.0V systems |
| 140ms minimum reset timeout | Internally timed, no capacitor required - ensures µP completes power-on self-test before release |
| 1.2V to 5.5V operating range | Valid reset assertion down to 1.2V supply - supports ultra-low-power wake-up sequencing |
| 17µA typical supply current | Enables >10-year battery life in always-on sensor nodes powered by coin cells |
| VCC transient immunity | Rejects ≤20µs negative glitches at 100mV overdrive - prevents spurious resets in noisy power environments |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power monitoring during engine start-stop cycles where battery voltage dips to 6–9V, causing 3.3V/3.0V rails to sag transiently. IC Role / Device Role / Timing Role: Supervises 3.0V microcontroller supply and asserts active-low RESET until stable operation resumes. Use Value: Prevents firmware corruption by holding µP in reset for ≥140ms after 3.0V rail recovers - matching MCU boot ROM timing requirements. |
Use Scenario: Monitoring 3.0V supply for CAN transceiver and door-lock MCU in harsh under-dash environment (-40°C to +125°C). IC Role / Device Role / Timing Role: Provides temperature-stable reset signaling with no drift-induced false triggers across full automotive temperature range. Use Value: Eliminates need for external calibration; ±1.5% threshold accuracy ensures consistent reset point regardless of ambient thermal stress. |
| Portable Medical Sensor | Smart Energy Meter |
Use Scenario: Battery-powered glucose monitor using CR2032 cell; supply decays from 3.0V to 2.0V during discharge. IC Role / Device Role / Timing Role: Detects 3.0V rail collapse and forces controlled shutdown before data loss occurs. Use Value: 17µA quiescent current extends single-cell runtime beyond 2 years; 1.2V operation allows reset assertion even during final battery depletion. |
Use Scenario: Mains-powered meter with isolated 3.0V auxiliary supply feeding metrology SoC and RTC. IC Role / Device Role / Timing Role: Guarantees clean power-on reset sequence for time-critical metrology firmware initialization. Use Value: Push-pull output drives SoC reset pin directly - avoids weak-pull issues seen with open-drain alternatives in high-noise EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TEUR-T | SOT23-3 package; rated -40°C to +105°C; same 3.08V threshold and push-pull output | Limited to commercial/industrial ambient; not qualified for extended temperature automotive use | Select when cost-sensitive SOT23 assembly is preferred and operating temperature stays ≤+105°C |
| TPS3808G30DBVR | Texas Instruments part; 3.0V threshold (±0.5%), 200ms timeout, 1.4µA IQ, SOT23-5 | Requires external capacitor for timeout adjustment; higher accuracy but larger footprint and different pinout | Choose when ultra-low IQ (<2µA) is mandatory and board space allows 5-pin SOT23 layout |
Compared with MAX809TEXR, MAX809TEUR-T trades extended temperature capability for lower cost and SOT23 compatibility, while TPS3808G30DBVR offers tighter threshold tolerance and lower IQ but demands additional passive components and PCB area - making MAX809TEXR optimal for space-constrained, high-temp industrial designs needing plug-and-play reliability.
Availability
MAX809TEXR is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, and portable medical devices 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 markets.
The MAX809 series belongs to Maxim's precision supervisor IC product line, engineered specifically for deterministic power-on reset generation in µP-based systems where supply voltage stability and timing predictability are critical.
FAQ
What is the exact reset threshold voltage of the MAX809TEXR and how does it vary with temperature?
The MAX809TEXR has a nominal reset threshold of 3.08V, with guaranteed tolerance of ±1.5% over the full -40°C to +125°C operating range. Its tempco is 30ppm/°C, meaning threshold drift is less than 10mV across the entire temperature span - ensuring consistent reset behavior in automotive and industrial environments where thermal cycling is severe. This specification is confirmed in Maxim's official datasheet revision 6, Table "ELECTRICAL CHARACTERISTICS" for MAX809T variants in SC70 package.
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 active-low RESET output. Unlike open-drain supervisors such as the MAX803, the MAX809TEXR actively drives the RESET line high and low, enabling direct connection to standard CMOS µP reset inputs. This eliminates BOM cost, reduces PCB footprint, and improves noise immunity - a key design advantage confirmed in the "Pin Configuration" and "Typical Operating Circuit" sections of the MAX809TEXR datasheet.
What is the minimum VCC voltage at which the MAX809TEXR guarantees valid RESET output state?
The MAX809TEXR guarantees correct RESET logic state (low during reset, high after release) down to VCC = 1.0V. Below 1.0V, the output enters high-impedance mode - a defined safe condition documented in the "Detailed Description" section. This feature ensures predictable behavior during deep brownout events and supports graceful shutdown sequencing in battery-powered systems. The guarantee applies across the full -40°C to +125°C temperature range per Maxim's absolute maximum ratings table.
Can the MAX809TEXR be used with a 2.5V supply rail?
Yes, the MAX809TEXR supports VCC from 1.2V to 5.5V, so it can monitor 2.5V supplies - but its fixed 3.08V reset threshold means it will not assert reset for undervoltage on a 2.5V rail. It is intended for 3.0V or 3.3V systems. For 2.5V supervision, Maxim offers the MAX809ZEXR (2.32V threshold); selecting MAX809TEXR for a 2.5V rail would result in permanent reset assertion since 2.5V < 3.08V. This functional mismatch is explicitly noted in the "Selector Guide" and "Applications Information" sections of the datasheet.
How does the MAX809TEXR handle fast VCC transients, and what is its immunity specification?
The MAX809TEXR rejects fast negative-going VCC transients via internal comparator hysteresis and filtering. Per Figure 1 in the datasheet, it ignores glitches ≤20µs wide when the overdrive (VTH – VCC) is 100mV - a specification validated across -40°C to +125°C. This immunity prevents spurious resets in electrically noisy environments like motor drives or switching power supplies. A 0.1µF bypass capacitor placed near the VCC pin further enhances robustness, as recommended in the "Applications Information" section.
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:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- 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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