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Analog Devices Inc. ADM706AR-REEL7
- Part No.:
- ADM706AR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM706AR-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,473
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Product details
Overview
ADM706AR-REEL7 from Analog Devices is a low-cost microprocessor supervisory circuit designed for 5 V supply monitoring in embedded systems. It provides active-low reset output with 4.40 V threshold, 200 ms reset pulse width, 190 μA quiescent current, and integrated watchdog timer (1.60 sec timeout), used to ensure reliable power-up sequencing and system recovery in industrial controllers.
For engineers reviewing the ADM706AR-REEL7 datasheet, ADM706AR-REEL7 pinout, ADM706AR-REEL7 application, or ADM706AR-REEL7 equivalent, key selection criteria include reset threshold accuracy (4.40 V ±150 mV), guaranteed RESET validity down to VCC = 1 V, watchdog input timing (50 ns minimum pulse width), and compatibility with TTL/CMOS manual reset sources.
Technical Context
The ADM706AR-REEL7 implements a precision voltage monitor with 4.40 V reset threshold and 40 mV hysteresis, enabling stable brownout detection during 5 V supply fluctuations. Its internal watchdog timer requires toggling of the WDI input every 1.60 seconds to prevent WDO assertion - a critical feature for detecting firmware lockups in real-time microprocessor systems.
It integrates a 1.25 V power-fail comparator (PFI/PFO) for secondary supply monitoring and features debounced TTL/CMOS-compatible MR input with 250 μA internal pull-up. RESET remains valid down to VCC = 1 V, ensuring deterministic microprocessor hold-down during full power ramp-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V ±150 mV - triggers reset when 5 V rail drops below safe operating level for most TTL/CMOS microprocessors |
| Reset Pulse Width | 200 ms typical - ensures sufficient time for microprocessor power stabilization and internal state initialization |
| Quiescent Current | 190 μA - enables low-power operation in battery-backed or energy-sensitive applications |
| Watchdog Timeout | 1.60 sec - provides robust firmware activity monitoring without excessive false triggers |
| VCC Validity Range | 1.0 V to 5.5 V - guarantees functional RESET output even during deep brownout or partial power loss |
| MR Input Threshold | Logic Low ≤0.8 V, Logic High ≥2.0 V - ensures compatibility with standard 5 V logic families and mechanical reset switches |
| PFI Comparator Threshold | 1.25 V ±50 mV - allows precise monitoring of auxiliary supplies via external resistive divider |
Pinout & Package
ADM706AR-REEL7 is housed in an 8-lead SOIC_N (R-8) package, 3.90 mm × 4.90 mm body size, 1.27 mm lead pitch, compliant with JEDEC MS-012-AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 250 μA; asserts RESET when driven below 0.8 V |
| 2 - VCC | Power Supply Input | 5 V nominal supply pin; requires local 0.1 μF decoupling capacitor to GND for noise immunity |
| 3 - GND | Ground Reference | 0 V reference for all analog and digital functions; must be connected to system ground plane |
| 4 - PFI | Power Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via external resistor divider |
| 5 - PFO | Power Fail Output | Active-low open-drain output signaling PFI < 1.25 V; can interrupt microprocessor or trigger backup action |
| 6 - WDI | Watchdog Input | Three-level input (high/low/floating); resets watchdog timer on each transition; disabled if left floating |
| 7 - RESET | Reset Output | Active-low push-pull output; held low for 200 ms after VCC rise or MR release; valid down to VCC = 1 V |
| 8 - WDO | Watchdog Output | Active-low open-drain output; goes low on watchdog timeout or VCC < reset threshold; connects to MR for auto-reset |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET at VCC = 1 V | Ensures fail-safe microprocessor hold-down during complete power collapse, eliminating risk of undefined startup states |
| Integrated Watchdog Timer | 1.60 sec timeout prevents system hang without requiring external timing components or firmware overhead |
| Independent Power-Fail Comparator | 1.25 V reference with PFI/PFO pins enables early warning of auxiliary supply failure before main rail drops |
| Debounced Manual Reset Input | 250 μA internal pull-up and 200 ms debounce eliminate need for external RC filtering or software debouncing |
| Low Quiescent Current | 190 μA operation supports long-term battery backup in critical monitoring applications without significant drain |
Applications
| Industrial PLC Control | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Monitoring 5 V logic supply in programmable logic controller I/O modules subject to transient line disturbances. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and watchdog supervision of main MCU. Use Value: Prevents spurious I/O activation during unstable power conditions and recovers locked firmware via WDO→MR connection. | Use Scenario: Ensuring deterministic boot sequence and runtime integrity in portable ultrasound imaging units with dual-supply architecture. IC Role / Device Role / Timing Role: Dual-role supervisor: primary reset generator for ARM Cortex-M7 host and secondary PFI monitor for 3.3 V analog front-end supply. Use Value: Enables graceful shutdown upon analog supply degradation while maintaining core processor reset integrity down to 1 V VCC. |
| Telecom Remote Terminal Unit | Automotive Body Control Module |
Use Scenario: Securing reliable startup and watchdog coverage in outdoor-mounted RTUs exposed to wide temperature (-40°C to +85°C) and voltage variation. IC Role / Device Role / Timing Role: System-level supervisor managing power sequencing, manual reset interface, and firmware liveness checking. Use Value: 200 ms reset pulse accommodates slow-ramping DC-DC converters; 1.60 sec watchdog interval balances responsiveness and noise immunity. | Use Scenario: Monitoring 5 V supply feeding CAN transceivers and microcontroller in vehicle door module with battery backup. IC Role / Device Role / Timing Role: Reset supervisor with PFI used to detect low-battery condition via direct battery sensing through resistor divider. Use Value: PFO interrupt initiates controlled sleep mode before battery depletion; RESET remains valid during cranking-induced 1 V dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CSA+ | 4.40 V reset threshold, 200 ms reset pulse, no watchdog timer, SOIC-8 package | Lacks integrated watchdog; requires external circuitry for firmware supervision | Select when watchdog functionality is unnecessary and cost minimization is prioritized over feature integration |
| TPS3808G33DBVR | 3.3 V reset threshold, adjustable watchdog (1.25 ms–10 s), SOT-23-6 package | Different reset voltage target and smaller footprint; requires external timing resistor for watchdog configuration | Select for 3.3 V systems needing programmable watchdog timeout and space-constrained PCB layouts |
Compared with MAX706CSA+ and TPS3808G33DBVR, ADM706AR-REEL7 uniquely combines fixed 4.40 V reset, integrated 1.60 sec watchdog, and 1 V operational floor in a standard SOIC-8 - making it optimal for legacy 5 V industrial designs requiring minimal BOM changes and proven reliability.
Availability
ADM706AR-REEL7 is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and telecom infrastructure requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ADM706AR-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, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.
The ADM705/ADM706 family was engineered specifically for cost-sensitive, high-reliability microprocessor supervision in 5 V systems - emphasizing guaranteed low-voltage reset operation, integrated watchdog safety, and seamless drop-in replacement for legacy MAX70x devices.
FAQ
What is the reset threshold voltage of the ADM706AR-REEL7 and how tightly is it specified?
The ADM706AR-REEL7 has a nominal reset threshold of 4.40 V, with a guaranteed range of 4.25 V to 4.50 V across temperature and supply conditions. This tight tolerance ensures consistent brownout detection in 5 V systems without requiring external calibration or trimming, directly supporting reliable microprocessor startup and fault recovery in ADM706AR-REEL7-based designs.
Does the ADM706AR-REEL7 provide both active-high and active-low reset outputs?
No, the ADM706AR-REEL7 provides only an active-low RESET output (Pin 7) and an active-low WDO output (Pin 8). Unlike the ADM707/ADM708 variants, it does not include an active-high RESET pin. For systems requiring active-high reset, an external inverter or the WDO signal (with pull-up) may be used, but the ADM706AR-REEL7 itself delivers only active-low assertion.
Can the watchdog timer in the ADM706AR-REEL7 be disabled, and if so, how?
Yes, the watchdog timer in the ADM706AR-REEL7 is automatically disabled when the WDI pin (Pin 6) is left floating or connected to a high-impedance (three-state) source. The datasheet confirms that the internal timer stops counting under these conditions, allowing WDO to function solely as a low-line indicator tied to VCC status - a verified behavior documented in the "Watchdog Timer" section of the ADM706AR-REEL7 datasheet.
What is the minimum VCC voltage at which the ADM706AR-REEL7 guarantees valid RESET output?
The ADM706AR-REEL7 guarantees valid RESET output down to VCC = 1.0 V, as confirmed in both the Features list and the "Valid RESET Below 1 V VCC" section of its datasheet. At this voltage, RESET remains low with defined sink capability (0.3 V at 50 µA), ensuring the microprocessor stays held in reset during deep brownout - a key differentiator versus competitors with higher minimum VCC requirements.
Is the ADM706AR-REEL7 RoHS-compliant and what packaging format does the "-REEL7" suffix indicate?
Yes, the ADM706AR-REEL7 is RoHS-compliant (lead-free, halogen-free) and supplied in tape-and-reel format per EIA-481 standard, with 1,000 units per 7-inch reel. The "-REEL7" suffix explicitly denotes this packaging configuration, enabling automated SMT placement and supporting high-volume manufacturing requirements for ADM706AR-REEL7 deployments.
ADM706AR-REEL7 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:
- 4.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM706AR-REEL7 FAQ
1.How can I place an order for ADM706AR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM706AR-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 ADM706AR-REEL7 reliable?
The price and inventory of ADM706AR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM706AR-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM706AR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM706AR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM706AR-REEL7?
ADM706AR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM706AR-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 ADM706AR-REEL7?
For technical support, including ADM706AR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM706AR-REEL7 requirements.
6.How does Aetrix verify that ADM706AR-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM706AR-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 ADM706AR-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM706AR-REEL7?
All ADM706AR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM706AR-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 ADM706AR-REEL7 part is unused and in its original packaging.
Return procedure for ADM706AR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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