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Analog Devices Inc./Maxim Integrated MAX809ZEXR+T
- Part No.:
- MAX809ZEXR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809ZEXR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
MAX809ZEXR+T from Maxim Integrated is a 3-pin SC70-packaged microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +2.5V power supplies. It asserts reset when VCC falls below 2.32V (typ), holds reset for ≥140ms after VCC recovers, operates from -40°C to +125°C, draws only 17µA (typ) at VCC = 2.5V, and guarantees valid reset down to VCC = 1V - used in automotive and industrial embedded systems requiring high-temperature reliability.
For engineers reviewing the MAX809ZEXR+T datasheet, MAX809ZEXR+T pinout, MAX809ZEXR+T application, or MAX809ZEXR+T equivalent, this page delivers verified electrical parameters, thermal operating limits, reset timing behavior, package dimensions, and direct alternatives for critical power-monitoring designs where supply voltage accuracy and extended temperature stability are mandatory.
Technical Context
The MAX809ZEXR+T implements a precision bandgap-based reset comparator with 30ppm/°C tempco, ensuring stable 2.32V threshold across -40°C to +125°C. Its push-pull output drives low with ≤0.3V at 1.2mA sink current and remains functional even as VCC decays to 1V.
It features built-in immunity to fast VCC transients: a 100mV overdrive (VTH − VCC) negative glitch ≤20µs does not trigger spurious reset. The device requires no external components and integrates all supervision logic into a single 3-pin SC70 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (typ) at +25°C; guaranteed 2.22V to 2.42V over -40°C to +125°C - ensures reliable reset assertion before system brownout |
| Reset Timeout | ≥140ms minimum after VCC rises above threshold - meets μP power-on reset timing requirements |
| Supply Current | 17µA (typ) at VCC = 2.5V, -40°C to +85°C - enables ultra-low-power battery-backed operation |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Output Type | Push-pull active-low RESET - eliminates need for external pullup resistor and supports direct CMOS interface |
| VCC Range | 1.2V to 5.5V - allows use with wide range of logic supplies while maintaining reset validity down to 1V |
| Reset Comparator Tempco | 30ppm/°C - minimizes threshold drift across temperature, improving system margin predictability |
Pinout & Package
MAX809ZEXR+T is housed in a 3-pin SC70 package (package code X3+2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant matte-tin plating. Pin 1 is GND, Pin 2 is RESET (active-low push-pull), Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Provides return path for internal reset comparator and output stage; must be connected to system ground plane for noise immunity |
| RESET (Pin 2) | Active-low push-pull reset output | Drives low (≤0.3V @ 1.2mA) during reset; floats high (VOH ≥ 0.8×VCC) when deasserted - directly interfaces with μP reset input without external components |
| VCC (Pin 3) | Supply voltage input | Power source for internal circuitry; monitored for threshold violation; supports 1.2V–5.5V operation with reset validity guaranteed down to 1V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32V reset threshold | Enables accurate monitoring of +2.5V rails with ±0.1V tolerance over full temperature range - avoids premature or delayed reset in low-voltage systems |
| 140ms minimum reset timeout | Guarantees sufficient hold time for μP initialization sequences, eliminating need for external RC timing networks |
| 17µA typical supply current | Reduces quiescent load on battery or energy-harvested supplies - extends operational life in portable and remote sensors |
| Valid reset down to VCC = 1V | Ensures deterministic state during deep brownout; prevents metastability in downstream logic when supply collapses |
| SC70 package with AEC-Q100 qualification | Supports high-density PCB layouts and automotive-grade reliability without derating - rated for 125°C junction temperature |
Applications
| Automotive Engine Control Units | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring 2.5V sensor interface supply in engine control unit under hood temperature cycling (-40°C to +125°C). IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to MCU during supply sag caused by alternator load dump or cold cranking. Use Value: Prevents erratic MCU behavior by guaranteeing ≥140ms reset pulse even at 125°C ambient, using only internal circuitry - no external components required. | Use Scenario: Power supervision for isolated 2.5V digital I/O rail in programmable logic controller backplane. IC Role / Device Role / Timing Role: Reset generator that holds PLC firmware in reset until 2.5V rail stabilizes post-power-up, with immunity to 20µs transients on VCC. Use Value: Eliminates false resets from switching noise on shared power bus, enabling robust operation in electrically noisy factory environments. |
| Battery-Powered Medical Sensors | Rail-Specific Industrial Microcontrollers |
Use Scenario: Low-power health monitor using coin-cell battery and 2.5V LDO to power ADC and BLE SoC. IC Role / Device Role / Timing Role: Supervisor ensuring BLE SoC remains held in reset until 2.5V rail reaches regulation, then releasing with precise 2.32V threshold. Use Value: 17µA supply current extends battery life; SC70 footprint saves board space; reset validity to 1V prevents lockup during final battery discharge. | Use Scenario: Dedicated reset for 2.5V core supply of industrial ARM Cortex-M7 microcontroller in motor drive inverter. IC Role / Device Role / Timing Role: Independent reset source tied only to 2.5V domain - isolates reset assertion from fluctuations on 12V or 5V auxiliary rails. Use Value: Enables clean, rail-specific power sequencing without cross-coupling; push-pull output drives heavy capacitive loads on reset net directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809ZUR+T | SOT23-3 package; rated for -40°C to +105°C; same 2.32V threshold and push-pull output | Lower max temperature rating; suitable for non-automotive industrial applications where 125°C is not required | Select when cost-sensitive SOT23 assembly is preferred and ambient temperature stays ≤105°C |
| TPS3808G12DBVR | Texas Instruments part; 1.2V threshold variant; 350ms min reset timeout; 1.4µA quiescent current; SOT23-6 package | Not a direct replacement: different threshold, longer timeout, higher pin count, and no AEC-Q100 qualification | Consider only if system requires sub-2V monitoring or ultra-low current, and layout can accommodate 6-pin footprint |
Compared with MAX809ZEXR+T, the MAX809ZUR+T offers identical electrical behavior in a lower-cost SOT23 package but sacrifices 20°C of temperature range; the TPS3808G12DBVR provides significantly lower supply current but lacks automotive qualification, has longer reset timeout, and requires PCB redesign due to 6-pin layout - neither is pin-compatible.
Availability
MAX809ZEXR+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and battery-powered medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809ZEXR+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, designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for high-reliability power monitoring in harsh environments where accurate voltage thresholding and extended temperature operation are critical.
FAQ
What is the exact reset threshold voltage of the MAX809ZEXR+T and how does it vary with temperature?
The MAX809ZEXR+T has a nominal reset threshold of 2.32V at +25°C, with guaranteed limits of 2.22V (min) to 2.42V (max) over the full -40°C to +125°C operating range. Its reset comparator exhibits a tempco of 30ppm/°C, meaning threshold drift is tightly controlled - for example, at +125°C, the threshold shifts by approximately 2.5mV from its +25°C value. This precision ensures consistent brownout detection across automotive and industrial thermal profiles without calibration.
Does the MAX809ZEXR+T require an external pullup resistor on its RESET pin?
No, the MAX809ZEXR+T does not require an external pullup resistor because it features a push-pull active-low RESET output. Unlike open-drain variants such as the MAX803ZEXR+T, the MAX809ZEXR+T internally drives the RESET pin high (VOH ≥ 0.8×VCC) when deasserted and low (VOL ≤ 0.3V @ 1.2mA) when asserted. This eliminates external components and simplifies interface to standard CMOS reset inputs in microcontrollers and FPGAs.
Is the MAX809ZEXR+T qualified for automotive applications?
Yes, the MAX809ZEXR+T is AEC-Q100 qualified and specified for operation from -40°C to +125°C, making it suitable for automotive under-hood applications including engine control units, transmission control modules, and body electronics. Its SC70 package (X3+2) is RoHS-compliant and rated for reflow soldering up to +260°C, meeting automotive manufacturing requirements.
What is the minimum VCC voltage at which the MAX809ZEXR+T guarantees correct RESET logic state?
The MAX809ZEXR+T guarantees correct RESET logic state - i.e., valid low or high output - for VCC down to +1V. Below 1V, the output stage may become indeterminate. This feature ensures deterministic reset behavior during deep brownout conditions common in automotive stop-start systems or battery-depleted portable devices, preventing metastability in connected microprocessors.
How does the MAX809ZEXR+T handle fast transients on the VCC supply line?
The MAX809ZEXR+T incorporates transient immunity circuitry that ignores fast negative-going VCC glitches: a 100mV overdrive (VTH − VCC) transient lasting ≤20µs will not trigger a false reset pulse. This behavior is confirmed in the datasheet's Typical Operating Characteristics plots and enables reliable operation in electrically noisy environments like motor drives or switch-mode power supply outputs without requiring additional filtering beyond a 0.1µF bypass capacitor near the VCC pin.
MAX809ZEXR+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- 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
MAX809ZEXR+T FAQ
1.How can I place an order for MAX809ZEXR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809ZEXR+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 MAX809ZEXR+T reliable?
The price and inventory of MAX809ZEXR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809ZEXR+T is usually 5 days.
3.What payment methods are accepted for MAX809ZEXR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809ZEXR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809ZEXR+T?
MAX809ZEXR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809ZEXR+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 MAX809ZEXR+T?
For technical support, including MAX809ZEXR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809ZEXR+T requirements.
6.How does Aetrix verify that MAX809ZEXR+T is sourced from the original manufacturer or authorized distributors?
All MAX809ZEXR+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 MAX809ZEXR+T meets industry standards.
7.What is the process for return or replacement of MAX809ZEXR+T?
All MAX809ZEXR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809ZEXR+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 MAX809ZEXR+T part is unused and in its original packaging.
Return procedure for MAX809ZEXR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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