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Analog Devices Inc. ADM809RART-REEL7
- Part No.:
- ADM809RART-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ADM809RART-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,729
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Product details
Overview
ADM809RART-REEL7 from Analog Devices is a microprocessor supervisory circuit in 3-lead SOT-23 package, providing push-pull active-low reset output with 2.63 V reset threshold, 140–460 ms reset timeout, and operation down to 1.0 V VCC. It monitors power supply integrity during power-up, brownout, and power-down in embedded microcontroller systems.
For engineers reviewing the ADM809RART-REEL7 datasheet, ADM809RART-REEL7 pinout, ADM809RART-REEL7 application, or ADM809RART-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), low 17 μA quiescent current, push-pull output drive capability (3.2 mA sink at VTH min), and guaranteed reset assertion below 1 V VCC.
Technical Context
The ADM809RART-REEL7 integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) power-on reset timer. Its reset assertion remains valid even as VCC drops to 1.0 V, ensuring reliable microprocessor initialization under marginal supply conditions.
It features a fixed 2.63 V reset threshold optimized for 2.5 V system rails, operates across −40°C to +125°C, and delivers push-pull RESET output compatible with standard CMOS/TTL logic without requiring external pull-up components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (nominal); ±2.7% tolerance over −40°C to +125°C - ensures accurate detection of 2.5 V rail collapse before microprocessor malfunction. |
| Reset Timeout | 140–460 ms (−40°C to +85°C); 100–840 ms (+85°C to +125°C) - guarantees sufficient hold time for CPU core and peripherals to stabilize post-power-up. |
| Supply Current | 17 μA (typical at VCC < 3.6 V, −40°C to +85°C) - enables use in battery-powered and ultra-low-power embedded systems. |
| VCC Operating Range | 1.0 V to 5.5 V - supports reset assertion even during deep brownout, critical for fail-safe shutdown sequencing. |
| RESET Output Type | Push-pull active-low - eliminates need for external pull-up resistor and provides robust 3.2 mA sink drive into heavy capacitive loads. |
| Reset Propagation Delay | 20 μs (VCC falling from VTH to VTH − 100 mV) - fast response to transient supply dips without false triggering. |
Pinout & Package
ADM809RART-REEL7 uses a 3-lead SOT-23 (RT-3) package with 1.3 mm × 2.9 mm footprint and 0.95 mm height, compliant with JEDEC TO-236-AB standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and reset generator - must be connected directly to system ground plane for noise immunity. |
| 2 | RESET | Active-low push-pull output - drives low during reset condition and high-impedance off-state; interfaces directly to microprocessor /RESET pin. |
| 3 | VCC | Monitored supply input - connects to the 2.5 V rail being supervised; internal circuitry remains functional down to 1.0 V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.63 V with ±2.7% max variation over full temperature range - eliminates need for external trimming in 2.5 V systems. |
| Ultra-low quiescent current | 17 μA typical - extends battery life in portable instrumentation and remote sensors. |
| Brownout detection down to 1.0 V VCC | Guaranteed RESET assertion until VCC falls below 1.0 V - prevents erratic MCU behavior during uncontrolled power decay. |
| Glitch-immune comparator | Rejects transients up to 100 μs duration at 100 mV overdrive - avoids spurious resets from switching noise or ESD events. |
| Extended temperature range | −40°C to +125°C operation - qualified for automotive under-hood and industrial control environments. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 2.5 V I/O supply in programmable logic controller CPU board subject to load dump and cold-crank voltage transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting /RESET during brownout to prevent firmware corruption and ensure deterministic boot sequence. Use Value: 2.63 V threshold matches 2.5 V rail tolerance; 17 μA current minimizes standby power; 1.0 V VCC operation sustains reset through severe undervoltage events. |
Use Scenario: Secures boot integrity of microcontroller in door module exposed to −40°C ambient and 125°C under-hood thermal cycling. IC Role / Device Role / Timing Role: Voltage monitor generating 240 ms minimum reset pulse to meet ISO 16750-2 cold-crank timing requirements. Use Value: −40°C to +125°C qualification; push-pull output eliminates external components; 2.63 V threshold aligns with 2.5 V sensor interface rail. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Ensures reliable startup of ARM Cortex-M4 host processor after battery swap or AC power interruption. IC Role / Device Role / Timing Role: Power-on reset generator holding /RESET asserted for ≥140 ms while 2.5 V LDO stabilizes and clock PLL locks. Use Value: Low 17 μA supply current preserves backup battery runtime; glitch immunity prevents false resets from ECG amplifier switching noise. |
Use Scenario: Supervises 2.5 V RTC and metrology ASIC supply in utility meter operating continuously for 15+ years. IC Role / Device Role / Timing Role: Brownout detector asserting reset when mains-derived 2.5 V rail sags below 2.4 V during grid instability. Use Value: 2.63 V threshold provides 130 mV hysteresis margin above 2.5 V nominal; 1.0 V VCC operation maintains reset state during capacitor discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809RTRG+T | 2.63 V threshold, SOT-23-3, push-pull active-low output, but 20 μA typical supply current and −40°C to +85°C rating only. | Limited to commercial/industrial ambient; lacks extended temperature qualification for automotive or harsh-environment use. | Select when cost sensitivity outweighs extended temperature needs and 3 μA higher current is acceptable. |
| TPS3808G12DBVR | 1.2 V adjustable threshold via external resistor divider; 1.5 μA typical current; SOT-23-6 package with manual reset input and watchdog timer. | Requires external components for 2.63 V setting; adds complexity but enables programmability and system-level fault recovery. | Select when design requires configurable reset voltage or integrated watchdog functionality beyond basic supervision. |
Compared with MAX809RTRG+T, ADM809RART-REEL7 offers guaranteed operation to +125°C and lower quiescent current; versus TPS3808G12DBVR, it provides simpler drop-in replacement for fixed-threshold 2.5 V rail monitoring without external resistors or extra pins.
Availability
ADM809RART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM809RART-REEL7 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM809 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation and brownout protection in resource-constrained embedded systems with stringent reliability requirements.
FAQ
What is the exact reset threshold voltage of ADM809RART-REEL7 and how does it vary with temperature?
The ADM809RART-REEL7 has a nominal reset threshold of 2.63 V, with a guaranteed range of 2.52 V to 2.74 V over −40°C to +125°C. This corresponds to ±2.7% tolerance at maximum temperature extremes, ensuring consistent detection of 2.5 V rail failure across automotive and industrial operating conditions. The device's 30 ppm/°C temperature coefficient contributes to this stability.
Does ADM809RART-REEL7 require an external pull-up resistor on the RESET pin?
No, ADM809RART-REEL7 does not require an external pull-up resistor because it features a push-pull RESET output. Unlike open-drain variants such as the ADM803, the ADM809RART-REEL7 actively drives both high and low states, delivering a logic-high output of ≥0.8×VCC when deasserted and ≤0.4 V when asserted at 3.2 mA sink current.
Can ADM809RART-REEL7 operate reliably during deep brownout conditions?
Yes, ADM809RART-REEL7 remains fully functional and asserts RESET down to VCC = 1.0 V, as specified in its absolute operating range. This capability ensures continued supervision during severe undervoltage events where other supervisors may lose regulation, making it suitable for fail-safe applications like automotive cold-crank recovery and uninterruptible power sequencing.
What is the minimum reset timeout period for ADM809RART-REEL7 across its full temperature range?
The minimum guaranteed reset timeout for ADM809RART-REEL7 is 140 ms at temperatures from −40°C to +85°C. At elevated temperatures (+85°C to +125°C), the minimum timeout reduces to 100 ms. These values ensure sufficient hold time for modern microcontrollers to complete internal initialization before release from reset.
How does the ADM809RART-REEL7 differ from the ADM809RAKSZ-REEL7 variant?
The ADM809RART-REEL7 uses a 3-lead SOT-23 (RT-3) package, while ADM809RAKSZ-REEL7 uses a 3-lead SC70 (KS-3) package. Both share identical electrical specifications - 2.63 V threshold, push-pull active-low output, −40°C to +125°C rating, and RoHS compliance - but differ in footprint, thermal resistance (270°C/W vs. 146°C/W), and mounting compatibility with different PCB assembly processes.
ADM809RART-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ADM809RART-REEL7 FAQ
1.How can I place an order for ADM809RART-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM809RART-REEL7 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 ADM809RART-REEL7 reliable?
The price and inventory of ADM809RART-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM809RART-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM809RART-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM809RART-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM809RART-REEL7?
ADM809RART-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM809RART-REEL7 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 ADM809RART-REEL7?
For technical support, including ADM809RART-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM809RART-REEL7 requirements.
6.How does Aetrix verify that ADM809RART-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM809RART-REEL7 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 ADM809RART-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM809RART-REEL7?
All ADM809RART-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM809RART-REEL7, 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 ADM809RART-REEL7 part is unused and in its original packaging.
Return procedure for ADM809RART-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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