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Analog Devices Inc. ADM706RARZ
- Part No.:
- ADM706RARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM706RARZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:595
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Product details
Overview
ADM706RARZ from Analog Devices is a 3 V microprocessor supervisory circuit with active-low reset output, 2.63 V precision voltage monitoring 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 ADM706RARZ datasheet, ADM706RARZ pinout, ADM706RARZ application, or ADM706RARZ equivalent, key selection considerations include its SOIC-8 package, guaranteed RESET validity down to VCC = 1 V, debounced manual reset input (MR), independent power-fail comparator (PFI/PFO), and compatibility with 3 V/3.3 V supply rails in space-constrained industrial control and portable instrumentation.
Technical Context
The ADM706RARZ implements a precision bandgap-based voltage reference (2.63 V ±3%) for supply monitoring, paired with a monostable reset generator that holds RESET low for 200 ms after VCC rises above threshold or MR deasserts. Its internal 70 µA pull-up on MR enables direct switch interfacing without external components.
A dedicated watchdog timer monitors WDI transitions and asserts WDO low after 1.6 s of inactivity; the power-fail comparator uses a fixed 1.25 V reference on PFI to generate early warning via PFO. All logic outputs are specified across VCC = 2.7–5.5 V with rail-to-rail compatible drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±3% - precisely monitors 3 V supplies; triggers reset during brownout or power-up when VCC drops below this level. |
| Reset Pulse Width | 200 ms typical - ensures sufficient hold time for microprocessor initialization and clock stabilization after power recovery. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long battery life in portable instruments and low-power embedded systems. |
| Watchdog Timeout | 1.6 s - detects software lockup in real-time microcontroller applications without requiring external timing components. |
| Valid RESET Down To | VCC = 1 V - guarantees deterministic reset assertion even during deep undervoltage conditions, preventing metastability. |
| Power-Fail Threshold | 1.25 V on PFI - allows configurable early-warning detection of secondary supply collapse using external resistor divider. |
| Operating Temp | −40°C to +85°C - supports industrial-grade reliability in uncontrolled ambient environments. |
Pinout & Package
ADM706RARZ 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 with a dot or beveled corner.
| 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 pulled below 0.6 V. |
| 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 auxiliary supply via resistive divider; connect to GND if unused. |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; can interrupt MCU or drive MR for cascaded reset. |
| 6 WDI | Watchdog Input | Edge-sensitive input; toggled by MCU firmware; timeout occurs if no transition within 1.6 s. |
| 7 RESET | Reset Output | Active-low push-pull output; driven low for 200 ms on power-up, brownout, or MR assertion; valid down to VCC = 1 V. |
| 8 WDO | Watchdog Output | Active-low push-pull output; goes low on WDI inactivity; also forced low when VCC < reset threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V threshold | Enables accurate supervision of 3 V systems without external trimming; ±3% tolerance eliminates need for calibration. |
| Integrated 1.6 s watchdog timer | Eliminates external RC timing network; detects firmware hangs without CPU intervention or additional ICs. |
| Guaranteed RESET at VCC = 1 V | Ensures fail-safe microprocessor hold-down during deep undervoltage events, preventing undefined state transitions. |
| Debounced MR input with 70 µA pull-up | Supports direct mechanical switch connection without external R/C filter or pull-up resistor. |
| Dual-supply monitoring capability | PFI/PFO pair allows simultaneous supervision of main VCC and auxiliary rail (e.g., backup battery or analog supply). |
Applications
| Industrial PLC Controller | Portable Medical Instrument |
|---|---|
|
Use Scenario: Monitors 3.3 V logic supply and 5 V analog rail in a battery-powered handheld ECG device with real-time data logging. IC Role / Device Role / Timing Role: Generates power-on reset, detects brownout on main supply, and signals low battery via PFI-driven PFO interrupt. Use Value: Prevents corrupted memory writes during voltage sag and enables graceful shutdown before battery depletion. |
Use Scenario: Ensures deterministic startup and runtime supervision of ARM Cortex-M4 in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Provides 200 ms reset pulse on power-up, monitors 3 V I/O supply, and feeds WDO to NMI pin for firmware crash recovery. Use Value: Eliminates need for discrete reset IC + external watchdog, reducing BOM count and PCB area by 30%. |
| Smart Energy Meter | Automated Test Equipment |
|
Use Scenario: Supervises isolated 3 V microcontroller supply and non-isolated 12 V power rail in a Class 0.2 electricity meter with metrology ASIC. IC Role / Device Role / Timing Role: Uses PFI to monitor preregulator input for early power-fail warning; asserts RESET to halt metering during grid interruption. Use Value: Enables >100 ms advance warning before supply collapse, allowing secure storage of last valid kWh reading. |
Use Scenario: Controls reset sequencing and runtime health-checking in modular PXI chassis with FPGA-based controller and multiple instrument modules. IC Role / Device Role / Timing Role: Generates synchronized reset to all modules on power-up; WDI toggled by FPGA heartbeat signal to detect configuration lockup. Use Value: Reduces field failure rate due to stuck states by 92% compared to software-only watchdog schemes. |
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 and SOIC-8 package; higher 120 µA quiescent current; no PFI/PFO comparator. | Lacks power-fail warning capability; suitable only where secondary supply monitoring is unnecessary. | Select MAX706RCSA+ only if PFI/PFO functionality is omitted from design and legacy Maxim footprint compatibility is required. |
| TPS3808G33DBVR | 2.93 V threshold (not 2.63 V); 360 ns propagation delay vs. 200 ms reset pulse; no watchdog or PFI inputs. | Designed for fast-reset applications like DSP bootloaders; incompatible with brownout recovery timing requirements of ADM706RARZ. | Choose TPS3808G33DBVR only for high-speed reset assertion where 2.63 V threshold and watchdog are not needed. |
Compared with MAX706RCSA+ and TPS3808G33DBVR, the ADM706RARZ uniquely combines precise 2.63 V supervision, integrated watchdog, and dual-supply monitoring in a single SOIC-8 device-making it irreplaceable in designs requiring coordinated reset, fail-safe shutdown, and runtime fault detection.
Availability
ADM706RARZ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for ADM706RARZ 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 ADM706 family was designed specifically for robust microprocessor supervision in harsh environments-delivering precision voltage monitoring, deterministic reset timing, and integrated fault-detection features for mission-critical embedded systems.
FAQ
What is the reset output polarity of the ADM706RARZ?
The ADM706RARZ features an active-low RESET output (pin 7), asserted low during power-up, brownout, or manual reset assertion. This matches standard microprocessor reset input requirements and differs from the active-high ADM706P variant. The ADM706RARZ does not provide complementary RESET output-only the single active-low signal.
Does the ADM706RARZ require external components to operate?
No, the ADM706RARZ operates autonomously with only a 0.1 µF ceramic decoupling capacitor between VCC and GND. Its MR input includes a 70 µA internal pull-up, eliminating external resistors for switch interfacing. PFI requires an external resistor divider only if monitoring a secondary supply; otherwise, it must be tied to GND.
Can the ADM706RARZ supervise both 3 V and 3.3 V supplies?
Yes-the ADM706RARZ is explicitly rated for VCC = 2.7 V to 5.5 V and maintains full specification compliance across 3 V and 3.3 V nominal rails. Its 2.63 V reset threshold provides appropriate hysteresis margin for both voltages, ensuring reliable detection of undervoltage conditions without false triggering.
How does the watchdog timer in the ADM706RARZ interact with the reset function?
The ADM706RARZ watchdog timer asserts WDO low on timeout but does not directly trigger RESET. To enable watchdog-initiated reset, WDO must be externally connected to MR. This architecture allows flexible system-level response-e.g., WDO can drive an NMI for diagnostic logging, while MR remains reserved for manual or power-event reset.
Is the ADM706RARZ pin-compatible with other devices in the ADM706 family?
Yes-the ADM706RARZ shares identical SOIC-8 (R-8) pinout and electrical behavior with all ADM706R variants (e.g., ADM706RAR, ADM706RARZ-REEL7). It is not pin-compatible with ADM706P (active-high RESET) or ADM708R (dual RESET outputs), as those differ in pin 7 and pin 8 functionality per the datasheet Figures 3–5.
ADM706RARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ADM706RARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM706RARZ 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 reliable?
The price and inventory of ADM706RARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM706RARZ is usually 5 days.
3.What payment methods are accepted for ADM706RARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM706RARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM706RARZ?
ADM706RARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM706RARZ 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?
For technical support, including ADM706RARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM706RARZ requirements.
6.How does Aetrix verify that ADM706RARZ is sourced from the original manufacturer or authorized distributors?
All ADM706RARZ 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 meets industry standards.
7.What is the process for return or replacement of ADM706RARZ?
All ADM706RARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM706RARZ, 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 part is unused and in its original packaging.
Return procedure for ADM706RARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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