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Analog Devices Inc. ADM706RAR
- Part No.:
- ADM706RAR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM706RAR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,969
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Product details
Overview
ADM706RAR from Analog Devices is a 3 V microprocessor supervisory circuit with active-low reset output, 2.63 V precision voltage monitor threshold, 200 ms reset pulse width, 100 µA quiescent current, and integrated watchdog timer with 1.6 s timeout-used for reliable power-on reset and brownout protection in embedded microcontroller systems.
For engineers reviewing the ADM706RAR datasheet, ADM706RAR pinout, ADM706RAR application, or ADM706RAR equivalent, this page delivers verified functional identity, SOIC-8 package mapping, reset/watchdog timing behavior, PFI/PFO power-fail monitoring capability, and validated alternative options for 3 V supply supervision in industrial and portable electronics.
Technical Context
The ADM706RAR implements a precision bandgap-based voltage reference (2.63 V ±40 mV) to trigger reset during VCC undervoltage or brownout, guaranteeing valid RESET down to VCC = 1 V. Its internal watchdog timer monitors WDI transitions and asserts WDO low after 1.6 s of inactivity, supporting fail-safe microprocessor recovery.
It integrates a dedicated 1.25 V power-fail comparator with PFI input and open-drain PFO output, enabling early warning of supply collapse or battery depletion. The MR input is internally debounced and pulled up with 70 µA, compatible with TTL/CMOS logic or mechanical switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±40 mV - precisely holds microprocessor in reset until 3 V rail stabilizes above minimum operating voltage. |
| Reset Pulse Width | 200 ms typical - ensures sufficient time for power supply and CPU clock stabilization after power-up or recovery. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long battery life in portable instrumentation and low-power embedded systems. |
| Watchdog Timeout | 1.6 s ±0.65 s - detects software lockup without requiring external timing components or firmware overhead. |
| Power-Fail Threshold | 1.25 V ±0.05 V on PFI - supports configurable early-warning detection of 3 V/3.3 V supply decay via resistive divider. |
| Supply Range | 2.7 V to 5.5 V - operates across wide input range while maintaining reset validity down to VCC = 1 V. |
| MR Input Pull-Up | 70 µA typical - eliminates need for external pull-up resistor and ensures clean debounced reset assertion. |
Pinout & Package
ADM706RAR is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch, 5.00 mm × 4.00 mm body, and 1.75 mm max height. Pin 1 is marked by notch or dot; device is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Debounced TTL/CMOS-compatible input; asserted low < 0.6 V triggers 200 ms reset; internally pulled up with 70 µA. |
| 2 VCC | Power Supply Input | Primary supply rail (2.7–5.5 V); requires 0.1 µF decoupling capacitor to GND for noise immunity. |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance connection. |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors secondary supply or battery via resistive divider. |
| 5 PFO | Power-Fail Output | Open-drain output active low when PFI < 1.25 V; used for NMI interrupt or system shutdown signaling. |
| 6 WDI | Watchdog Input | Edge-sensitive input; any transition clears 1.6 s timer; accepts pulses as narrow as 50 ns at VCC = 5 V. |
| 7 RESET | Active-Low Reset Output | Push-pull output asserted low during VCC undervoltage, MR assertion, or watchdog timeout (if WDO → MR). |
| 8 WDO | Watchdog Output | Open-drain output asserted low on watchdog timeout or VCC < reset threshold; sinks ≥1.2 mA at 3.6 V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V reset threshold | Enables accurate supervision of 3 V systems without external trimming; ±40 mV tolerance ensures robust margin over CPU VDD min. |
| Guaranteed RESET operation down to VCC = 1 V | Maintains processor in known state during deep brownout or battery discharge; eliminates risk of undefined logic states. |
| Integrated 1.6 s watchdog timer | Provides autonomous software fault detection without MCU intervention; resets on missing WDI toggle, not just crash. |
| Dedicated 1.25 V power-fail comparator | Allows independent monitoring of auxiliary rails or battery voltage with programmable trip point via PFI divider. |
| Internally debounced MR input | Eliminates need for external RC filter or firmware debounce; supports direct switch connection with no bounce artifacts. |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: Continuous operation in factory-floor automation with fluctuating 3 V supply due to shared bus loading. IC Role / Device Role / Timing Role: Supervises main 3 V rail, asserts RESET during brownout, and feeds WDI from UART TX line to detect firmware hang. Use Value: Prevents spurious I/O writes or relay misfires during undervoltage; 200 ms reset hold ensures deterministic boot sequence. |
Use Scenario: Battery-powered ECG device requiring graceful shutdown before Li-ion drops below 3.0 V. IC Role / Device Role / Timing Role: Monitors battery via PFI divider; triggers PFO interrupt at 3.1 V input, initiating data save and display off. Use Value: 100 µA quiescent current extends runtime; 1.25 V PFI threshold allows precise 3.0 V warning with 1% resistor tolerance. |
| Network Router Management Card | Smart Energy Meter |
|
Use Scenario: Remote telecom equipment subject to lightning-induced 3 V rail transients and intermittent power loss. IC Role / Device Role / Timing Role: Generates power-on reset and monitors CPU activity via GPIO toggled every 800 ms on WDI. Use Value: 1.6 s watchdog timeout provides safety margin against transient glitches while catching true lockups. |
Use Scenario: M-Bus powered meter with strict 3 V supply regulation and requirement for tamper-detection reset. IC Role / Device Role / Timing Role: Uses MR input tied to mechanical tamper switch; asserts RESET on enclosure breach for secure state reset. Use Value: 70 µA MR pull-up ensures switch closure reliably triggers reset without external bias; debouncing prevents false trips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA+ | Same 2.63 V reset threshold, 200 ms reset width, and SOIC-8 package; higher 150 µA quiescent current; no PFI/PFO function. | Lacks power-fail comparator; unsuitable where early warning of supply decay or dual-rail monitoring is required. | Select when only basic reset + watchdog is needed and PFI functionality is unused; verify layout compatibility with MAX706R footprint. |
| TPS3808G12DBVR | 2.63 V threshold, 200 ms reset, 1.6 µA quiescent current; no watchdog or PFI; push-pull RESET output only. | Ultra-low power but omits watchdog and power-fail features; requires external circuitry for WDI-like monitoring. | Prefer for battery-critical designs where watchdog and PFI are unnecessary; confirm RESET polarity matches system requirements. |
Compared with ADM706RAR, MAX706RCSA+ retains full functional parity except PFI/PFO omission, while TPS3808G12DBVR trades watchdog and power-fail capability for 99% lower quiescent current-making it suitable only when those features are excluded from the system architecture.
Availability
ADM706RAR is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, network router management cards, and smart energy meters requiring stable component supply with guaranteed long-term sourcing.
Supply support for ADM706RAR 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM706 family was designed specifically for robust microprocessor supervision in 3 V systems, delivering integrated reset, watchdog, and power-fail monitoring in a single SOIC-8 IC.
FAQ
What is the reset output polarity of the ADM706RAR?
The ADM706RAR provides an active-low RESET output (pin 7), asserted low during power-up, brownout, or manual reset assertion. This matches standard microprocessor reset inputs requiring low-active signaling. The ADM706RAR does not provide an active-high RESET output-unlike the ADM708R series or ADM706P variant. Its RESET output remains valid down to VCC = 1 V, ensuring reliable hold-down during deep undervoltage conditions.
Does the ADM706RAR include a watchdog timer function?
Yes, the ADM706RAR includes a fully integrated watchdog timer with a nominal 1.6 s timeout period. It monitors the WDI input (pin 6) for transitions and asserts WDO (pin 8) low if no edge occurs within that window. The timer resets on any WDI edge (rising or falling) and is also cleared during RESET assertion. This enables autonomous detection of software hangs without MCU firmware involvement.
What is the function of the PFI and PFO pins on the ADM706RAR?
On the ADM706RAR, PFI (pin 4) is the noninverting input to a dedicated 1.25 V comparator, used to monitor auxiliary supplies or battery voltage via an external resistive divider. PFO (pin 5) is its open-drain output, driven low when PFI falls below 1.25 V. This pair enables early-warning power-fail detection-for example, triggering an interrupt to save data before main supply collapse-without consuming additional MCU resources.
Can the ADM706RAR operate with a 3.3 V supply?
Yes, the ADM706RAR operates across VCC = 2.7 V to 5.5 V, making it fully compatible with 3.3 V systems. Its 2.63 V reset threshold provides appropriate margin above the 3.3 V rail's minimum specification (typically 3.135 V), ensuring reset deassertion only after stable regulation. All electrical parameters-including RESET output drive strength, WDI timing, and PFO sink current-are specified and guaranteed across this full range.
What package type is used for the ADM706RAR?
The ADM706RAR uses an 8-lead SOIC_N (small outline integrated circuit, narrow body) package designated R-8 per JEDEC MS-012-AA. It measures 5.00 mm × 4.00 mm with 1.27 mm lead pitch, has gull-wing leads, and is RoHS-compliant and lead-free. This surface-mount package supports automated assembly and offers thermal performance superior to PDIP variants, with θJA = 110°C/W.
ADM706RAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM706RAR FAQ
1.How can I place an order for ADM706RAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM706RAR 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 ADM706RAR reliable?
The price and inventory of ADM706RAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM706RAR is usually 5 days.
3.What payment methods are accepted for ADM706RAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM706RAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM706RAR?
ADM706RAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM706RAR 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 ADM706RAR?
For technical support, including ADM706RAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM706RAR requirements.
6.How does Aetrix verify that ADM706RAR is sourced from the original manufacturer or authorized distributors?
All ADM706RAR 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 ADM706RAR meets industry standards.
7.What is the process for return or replacement of ADM706RAR?
All ADM706RAR units undergo pre-shipment inspection (PSI). If there is an issue with ADM706RAR, 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 ADM706RAR part is unused and in its original packaging.
Return procedure for ADM706RAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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