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Analog Devices Inc. ADM706RARZ-REEL7
- Part No.:
- ADM706RARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM706RARZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
ADM706RARZ-REEL7 from Analog Devices is a 3 V microprocessor supervisory circuit with active-low reset output, 2.63 V reset threshold, 200 ms reset pulse width, 100 µA quiescent current, and integrated watchdog timer. It monitors power-up, brownout, and power-down conditions in embedded controllers and battery-powered instrumentation.
For engineers reviewing the ADM706RARZ-REEL7 datasheet, ADM706RARZ-REEL7 pinout, ADM706RARZ-REEL7 application, or ADM706RARZ-REEL7 equivalent, key selection criteria include reset threshold accuracy, guaranteed RESET validity down to 1 V VCC, debounced manual reset input, independent watchdog timeout (1.6 s), and power-fail warning capability via PFI/PFO.
Technical Context
The ADM706RARZ-REEL7 implements a precision bandgap-based voltage reference (2.63 V) for reset assertion, with 20 mV hysteresis. Its internal watchdog timer clears on any WDI transition and times out after 1.6 s of inactivity, driving WDO low to signal processor stall.
It integrates a dedicated 1.25 V power-fail comparator (PFI/PFO) for early warning of supply collapse, and supports bidirectional reset line interfacing via external current-limiting resistor. RESET remains valid with VCC ≥ 1 V, ensuring robust hold-down during deep brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±70 mV - precisely triggers reset when 3 V supply drops below safe operating level for microcontrollers. |
| Reset Pulse Width | 200 ms typical - provides sufficient time for microprocessor power stabilization and firmware initialization. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long battery life in portable and low-power systems. |
| Watchdog Timeout | 1.6 s - detects software lockup before system state corruption occurs in real-time control loops. |
| Power-Fail Threshold | 1.25 V on PFI - allows configurable early-warning detection of main supply collapse using external resistive divider. |
| VCC Validity Range | 1.0 V to 5.5 V - ensures RESET remains asserted and functional even during severe brownout down to 1 V. |
| MR Input Pull-Up | 70 µA typical - eliminates need for external pull-up resistor when interfacing with mechanical switches or open-drain logic. |
Pinout & Package
ADM706RARZ-REEL7 is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, 3.9 mm × 4.9 mm body, 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 70 µA; asserts RESET when driven below 0.6 V. |
| 2 (VCC) | Power Supply Input | Primary supply rail; requires 0.1 µF decoupling capacitor to GND for noise immunity and transient response. |
| 3 (GND) | Ground Reference | Common return path for all analog and digital functions; must be low-impedance connection to system ground plane. |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply or preregulator via external resistor divider. |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; can drive interrupt or be tied to MR for automatic shutdown reset. |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; any high↔low or low↔high transition resets 1.6 s watchdog timer; accepts 50 ns pulses at 5 V. |
| 7 (RESET) | Reset Output | Active-low push-pull output; held low for 200 ms after VCC rises above 2.63 V or MR deasserts; valid down to VCC = 1 V. |
| 8 (WDO) | Watchdog Output | Active-low push-pull output; goes low on watchdog timeout or when VCC < reset threshold; used for NMI or system recovery trigger. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V reset threshold | Enables reliable supervision of 3 V microcontroller rails without external trimming or calibration. |
| Guaranteed RESET operation down to 1 V VCC | Prevents premature release of reset during deep brownout, ensuring deterministic system shutdown. |
| Integrated 1.6 s watchdog timer with edge-triggered WDI | Eliminates need for external timing components while supporting flexible software-driven reset clearing. |
| Dedicated 1.25 V power-fail comparator (PFI/PFO) | Provides independent early-warning channel for backup supply monitoring or preregulator fault detection. |
| Internally debounced MR input with 70 µA pull-up | Reduces BOM count and PCB area by removing external RC network or pull-up resistor for switch interfaces. |
Applications
| Industrial PLC Controller Monitoring | Portable Medical Instrument Power Supervision |
|---|---|
Use Scenario: Continuous runtime monitoring of 3 V logic supply in programmable logic controller I/O modules subject to field-induced transients and thermal cycling. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and watchdog-based recovery to prevent firmware hang during communication faults. Use Value: Prevents undetected system lockup by asserting RESET within 200 ms of VCC drop below 2.63 V and triggering watchdog interrupt if main loop stalls. | Use Scenario: Battery-powered handheld diagnostic device requiring extended shelf life and fail-safe shutdown upon low-battery indication. IC Role / Device Role / Timing Role: Voltage supervisor generating active-low reset and power-fail warning (via PFI/PFO) to initiate graceful data save and display shutdown before battery depletion. Use Value: Enables 10+ year battery standby via 100 µA quiescent current and guarantees RESET remains asserted until VCC recovers above 2.63 V or reaches 1 V cutoff. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Microcontroller Supervision |
Use Scenario: Monitoring 3.3 V MCU supply in automotive BCM exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Supervisory IC delivering robust reset assertion during cold-crank (VCC dip to ~2.5 V) and detecting brownout via precise 2.63 V threshold. Use Value: Ensures deterministic MCU reset during ISO 16750-2 cold-crank test cycles, with RESET remaining valid down to 1 V to avoid metastability. | Use Scenario: Embedded metering SoC powered from switched-mode supply with variable input; requires dual-supply monitoring and tamper-resilient reset. IC Role / Device Role / Timing Role: Dual-role supervisor using PFI to monitor auxiliary 5 V rail and WDI to verify firmware liveness in metrology firmware loop. Use Value: Combines power-fail warning (PFO → MCU interrupt) and watchdog timeout (WDO → NMI) to meet IEC 62056-21 tamper-detection requirements. |
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 pulse, and SOIC-8 package; lacks integrated watchdog timer and PFI/PFO comparator. | Suitable only where standalone reset supervision suffices; no power-fail warning or software stall detection capability. | Select MAX706RCSA+ only if watchdog and PFI functions are unused and cost minimization is critical. |
| TPS3808G33DBVR | 2.93 V fixed reset threshold, 200 ms delay, 1.6 µA quiescent current; includes enable input but no watchdog or PFI. | Better for ultra-low-power battery applications; incompatible for 2.63 V threshold requirement and missing PFI/PFO functionality. | Choose TPS3808G33DBVR only for new designs targeting lower IQ and accepting higher reset threshold tolerance. |
Compared with MAX706RCSA+ and TPS3808G33DBVR, ADM706RARZ-REEL7 uniquely delivers integrated watchdog, PFI/PFO, and 2.63 V precision reset in one SOIC-8 package-enabling compact, feature-complete supervision without external components or design compromises.
Availability
ADM706RARZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for ADM706RARZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADM706 family is designed specifically for robust microprocessor supervision in harsh environments-delivering precision voltage monitoring, watchdog safety, and power-fail warning in a single IC for mission-critical embedded systems.
FAQ
What is the reset threshold voltage of the ADM706RARZ-REEL7?
The ADM706RARZ-REEL7 has a nominal reset threshold of 2.63 V, with a tolerance of ±70 mV (2.55 V to 2.70 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The threshold is referenced to an internal bandgap, ensuring stability across voltage and temperature variations. ADM706RARZ-REEL7 uses this precise threshold to assert RESET when the 3 V supply falls below safe operating levels for connected microcontrollers.
Does the ADM706RARZ-REEL7 include a watchdog timer?
Yes, the ADM706RARZ-REEL7 includes a fully integrated watchdog timer with a nominal timeout period of 1.6 seconds. The timer resets on any edge (rising or falling) at the WDI pin and asserts WDO low if no transition occurs within that window. This function is confirmed in the ADM706R variant datasheet and applies identically to ADM706RARZ-REEL7. The watchdog operates independently of the reset generator and remains functional as long as VCC ≥ 1 V.
What is the purpose of the PFI and PFO pins on the ADM706RARZ-REEL7?
The PFI (Power-Fail Input) and PFO (Power-Fail Output) pins implement a dedicated 1.25 V comparator for early-warning monitoring of auxiliary supplies. PFI accepts a scaled version of a secondary rail (e.g., 5 V or battery); when its voltage falls below 1.25 V, PFO drives low. This allows ADM706RARZ-REEL7 to signal impending power loss before the main 3 V rail collapses-enabling orderly data save or shutdown. PFO can also be connected to MR to generate a system reset on power-fail event.
Can the ADM706RARZ-REEL7 operate with supply voltages below 3 V?
Yes, the ADM706RARZ-REEL7 operates with VCC from 1.0 V to 5.5 V. Its reset output remains valid and functional down to VCC = 1 V, guaranteeing that the microprocessor stays held in reset during deep brownout conditions. This behavior is explicitly tested and guaranteed in the datasheet. Below 1 V, external pull-down may be required on RESET to maintain logic low, but ADM706RARZ-REEL7 itself sustains correct internal operation and output drive down to the 1 V limit.
What package type and footprint does the ADM706RARZ-REEL7 use?
The ADM706RARZ-REEL7 uses an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow) package, also designated R-8 per JEDEC MS-012-AA. Its dimensions are 4.90 mm × 3.90 mm × 1.75 mm, with 1.27 mm lead pitch and gull-wing leads. This package is compatible with standard SOIC-8 footprints and reflow soldering processes. The "-REEL7" suffix indicates it is supplied on a 7-inch tape-and-reel, optimized for automated SMT assembly.
ADM706RARZ-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:
- Active
- 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
ADM706RARZ-REEL7 FAQ
1.How can I place an order for ADM706RARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM706RARZ-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 ADM706RARZ-REEL7 reliable?
The price and inventory of ADM706RARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM706RARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM706RARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM706RARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM706RARZ-REEL7?
ADM706RARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM706RARZ-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 ADM706RARZ-REEL7?
For technical support, including ADM706RARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM706RARZ-REEL7 requirements.
6.How does Aetrix verify that ADM706RARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM706RARZ-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 ADM706RARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM706RARZ-REEL7?
All ADM706RARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM706RARZ-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 ADM706RARZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM706RARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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