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Analog Devices Inc. ADM709LAR-REEL
- Part No.:
- ADM709LAR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM709LAR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,956
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Product details
Overview
ADM709LAR-REEL from Analog Devices is a precision power supply monitor IC with active-low reset output, 4.65 V threshold, 140 ms minimum power-on reset pulse, and operation down to 1 V supply voltage; used for reliable microprocessor reset in industrial embedded systems during power-up, brownout, and power-down events.
For engineers reviewing the ADM709LAR-REEL datasheet, ADM709LAR-REEL pinout, ADM709LAR-REEL application, or ADM709LAR-REEL equivalent, key selection factors include reset threshold tolerance (±0.15 V), guaranteed RESET hold time at low VCC (≥1 V), SOIC-8 package compatibility, and quiescent current (35–200 µA across temperature).
Technical Context
The ADM709LAR-REEL implements a bandgap-based voltage comparator with internal timing circuitry to generate a minimum 140 ms active-low reset pulse after VCC rises above 4.65 V. Its RESET output remains functional down to VCC = 1 V, enabling robust shutdown sequencing.
It features glitch immunity against short VCC transients and supports bidirectional microprocessor reset lines via external series resistor (e.g., 4.7 kΩ). No external components are required for basic operation, though a 0.1 µF bypass capacitor on VCC is recommended for enhanced noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.15 V - precisely monitors +5 V supplies and triggers reset before logic-level violation. |
| Power-On Reset Pulse | 140–380 ms - ensures microprocessor stabilization after power-up; minimum guaranteed duration. |
| VCC Operating Range | 1.0 V to 5.5 V - enables valid RESET assertion even during deep brownout or controlled power-down. |
| Quiescent Current | 35–200 µA - ultra-low standby consumption across –40°C to +85°C, suitable for battery-backed systems. |
| RESET Output Drive | Sink: 3.2 mA @ 0.4 V - sufficient to directly drive TTL/CMOS inputs without buffer. |
| Package | SOIC-8 (SO-8) - surface-mount, industry-standard footprint with 110°C/W thermal resistance. |
Pinout & Package
ADM709LAR-REEL is housed in an 8-pin SOIC (SO-8) package with standard 1.27 mm pitch, gull-wing leads, and exposed pad not present. Pin 1 is marked by notch or bevel; pins 1, 4, 5, 6, and 8 are no-connect (NC), simplifying PCB layout and eliminating routing conflicts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connect | Internally unconnected; must remain floating or grounded per layout best practice. |
| Pin 2 (VCC) | Supply Input | Accepts 1.0–5.5 V; powers internal comparator and timer; requires local 0.1 µF bypass. |
| Pin 3 (GND) | Ground Reference | 0 V return path for all internal circuits; must connect to system ground plane with low impedance. |
| Pin 7 (RESET) | Active-Low Reset Output | Open-drain compatible; sinks up to 3.2 mA; asserts low during brownout and for ≥140 ms post-power-up. |
| Pins 4,5,6,8 | No Connect | Unused terminals; no electrical function; may be left unconnected or tied to GND for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65 V threshold | ±0.15 V tolerance ensures reliable detection of +5 V supply faults without false resets. |
| 140 ms minimum reset timeout | Guaranteed hold time allows full microprocessor clock and memory initialization before release. |
| Operation down to 1 V VCC | Enables deterministic reset assertion during controlled power-down, preventing undefined MCU states. |
| Glitch-immune VCC sensing | Rejects transients <20 µs, eliminating spurious resets from switching noise or ESD coupling. |
| SOIC-8 footprint | Drop-in replacement for legacy MAX709 in space-constrained industrial PCBs with automated assembly support. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Power cycling during field maintenance or mains interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Monitors 5 V backplane supply and asserts active-low RESET to halt CPU execution until stable voltage resumes. Use Value: Prevents corrupted I/O state transitions and firmware lockup by enforcing minimum 140 ms reset hold after recovery. | Use Scenario: Battery-backed operation during AC loss in imaging subsystems requiring deterministic shutdown. IC Role / Device Role / Timing Role: Detects brownout on 3.3 V logic rail and holds microcontroller in reset while backup power engages. Use Value: Ensures data integrity in flash memory writes by maintaining RESET until VCC ≥ 4.65 V and stable for ≥140 ms. |
| Automotive Body Control Modules | Test & Measurement Instrumentation |
Use Scenario: Cold-cranking voltage dip (down to 6 V battery sag) causing transient 5 V regulator droop. IC Role / Device Role / Timing Role: Senses VCC falling below 4.65 V and asserts RESET to freeze CAN controller state during undervoltage. Use Value: Avoids bus arbitration errors and EEPROM corruption by holding MCU reset until full recovery and timing margin. | Use Scenario: Calibration sequence interruption due to lab power supply instability or shared-rail noise. IC Role / Device Role / Timing Role: Provides clean, glitch-free reset signal to ARM Cortex-M based measurement engine upon supply fluctuation. Use Value: Guarantees consistent ADC initialization and reference settling by enforcing 140 ms minimum reset window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709LCSA+ | Same 4.65 V threshold, but higher quiescent current (20 µA typ vs. 35 µA min); SO-8 package; no 1 V operation guarantee. | Limited brownout resilience below 2 V; less suitable for deep power-down sequencing. | Prefer ADM709LAR-REEL when VCC may fall below 2 V or extended temperature range (–40°C to +85°C) is required. |
| TPS3808G33DBVR | 3.3 V threshold (not 4.65 V); adjustable delay option; 1.8–6 V VCC range; 1.6 µA quiescent current. | Designed for 3.3 V systems; lacks native +5 V monitoring capability without external resistor divider. | Select ADM709LAR-REEL for fixed, precision +5 V supply monitoring without external components or calibration. |
Compared with MAX709LCSA+ and TPS3808G33DBVR, the ADM709LAR-REEL uniquely combines 4.65 V threshold accuracy, 1 V operational floor, and industrial temperature rating in a drop-in SO-8 package-making it optimal for legacy +5 V microprocessor reset where reliability under brownout is critical.
Availability
ADM709LAR-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical diagnostic equipment, and test & measurement instrumentation requiring stable component supply across long production lifecycles.
Supply support for ADM709LAR-REEL 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 ADM709 belongs to Analog Devices' precision power monitoring product line, engineered specifically for deterministic microprocessor reset in harsh environments where supply voltage transients and wide temperature operation are critical design constraints.
FAQ
What is the exact reset threshold voltage of the ADM709LAR-REEL?
The ADM709LAR-REEL has a nominal reset threshold of 4.65 V, with a guaranteed range of 4.50 V to 4.75 V over the full industrial temperature range (–40°C to +85°C). This value is laser-trimmed at wafer test and does not require external calibration. The ADM709LAR-REEL maintains this precision without drift under typical board-level thermal gradients.
Does the ADM709LAR-REEL support operation below 2 V VCC?
Yes, the ADM709LAR-REEL guarantees functional RESET output down to VCC = 1.0 V, as specified in the Absolute Maximum Ratings and confirmed in the "RESET at Voltages < 1 V" section. Below 1 V, a 100 kΩ pull-down resistor is recommended to maintain low state. This capability is intrinsic to the ADM709LAR-REEL's internal architecture and verified across temperature.
Is the ADM709LAR-REEL pin-compatible with the MAX709 series?
Yes, the ADM709LAR-REEL uses the same SO-8 pinout as the MAX709LCSA+, with identical VCC (Pin 2), GND (Pin 3), and RESET (Pin 7) assignments and NC pins (1, 4, 5, 6, 8). No PCB redesign is needed for drop-in replacement, though the ADM709LAR-REEL offers improved 1 V operation and tighter threshold tolerance versus the MAX709LCSA+.
What is the minimum guaranteed RESET pulse width for the ADM709LAR-REEL?
The ADM709LAR-REEL guarantees a minimum RESET active-time-out period of 140 ms after VCC rises above the reset threshold. Typical duration is 280 ms, and maximum is 380 ms. This timing is internally generated and independent of external capacitors, ensuring consistent reset behavior across units and temperatures.
Can the ADM709LAR-REEL drive a microcontroller reset pin directly?
Yes, the ADM709LAR-REEL RESET output can directly drive most microcontroller reset inputs: it sinks up to 3.2 mA at 0.4 V (for ADM709L variants) and meets TTL/CMOS input thresholds. For bidirectional reset lines (e.g., MC68HC11), a 4.7 kΩ series resistor is recommended to prevent contention - a configuration validated in the ADM709LAR-REEL application notes.
ADM709LAR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM709LAR-REEL FAQ
1.How can I place an order for ADM709LAR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709LAR-REEL 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 ADM709LAR-REEL reliable?
The price and inventory of ADM709LAR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709LAR-REEL is usually 5 days.
3.What payment methods are accepted for ADM709LAR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709LAR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709LAR-REEL?
ADM709LAR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709LAR-REEL 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 ADM709LAR-REEL?
For technical support, including ADM709LAR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709LAR-REEL requirements.
6.How does Aetrix verify that ADM709LAR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM709LAR-REEL 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 ADM709LAR-REEL meets industry standards.
7.What is the process for return or replacement of ADM709LAR-REEL?
All ADM709LAR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM709LAR-REEL, 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 ADM709LAR-REEL part is unused and in its original packaging.
Return procedure for ADM709LAR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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