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Analog Devices Inc. ADM705AR-REEL
- Part No.:
- ADM705AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM705AR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,339
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Product details
Overview
ADM705AR-REEL from Analog Devices is a precision 5 V microprocessor supervisory circuit with active-low reset output, 4.65 V supply voltage monitor threshold, 200 ms reset pulse width, and integrated watchdog timer (1.60 sec timeout). It ensures reliable power-on/power-down reset assertion for embedded microcontrollers in industrial control and instrumentation systems.
For engineers reviewing the ADM705AR-REEL datasheet, ADM705AR-REEL pinout, ADM705AR-REEL application, or ADM705AR-REEL equivalent, key selection considerations include guaranteed RESET validity down to 1 V VCC, debounced manual reset input (MR), power-fail warning via PFI/PFO, and SOIC-8 packaging compatibility with automated SMT assembly.
Technical Context
The ADM705AR-REEL implements a dual-stage reset generation architecture: a precision bandgap-based voltage monitor triggers reset when VCC falls below 4.65 V ±40 mV hysteresis, while an independent watchdog timer monitors WDI transitions and asserts WDO if no toggle occurs within 1.60 sec. Both reset sources feed into a 200 ms monostable pulse generator driving the active-low RESET output.
Its power-fail comparator uses an internal 1.25 V reference to monitor external supplies via PFI, generating a low-going PFO signal when input drops below threshold. The MR input features internal 250 µA pull-up current and TTL/CMOS-compatible thresholds (0.8 V low / 2.0 V high), enabling direct switch or logic-level interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.15 V - guarantees reset assertion before 5 V rail collapse compromises microcontroller operation |
| Reset Pulse Width | 200 ms typical - provides sufficient time for power supply stabilization and CPU initialization |
| Supply Current | 190 µA typical - enables long-term battery-backed monitoring without significant drain |
| Watchdog Timeout | 1.60 sec ±0.65 sec - balances responsiveness to software lockup against false triggers from transient delays |
| VCC Validity Range | 1.0 V to 5.5 V - ensures RESET remains asserted and valid during brownout recovery and deep discharge |
| PFI Threshold | 1.25 V ±0.05 V - allows accurate secondary supply monitoring using standard resistor dividers |
| MR Input Pull-Up | 250 µA typical - eliminates need for external pull-up resistor in manual reset switch applications |
Pinout & Package
ADM705AR-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and gull-wing leads. Thermal impedance is 110°C/W (θJA), supporting industrial temperature operation (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | TTL/CMOS-compatible debounced input; internally pulled up at 250 µA; asserts RESET when driven below 0.8 V |
| 2 (VCC) | Power Supply Input | 5 V nominal supply input; requires local 0.1 µF decoupling capacitor to GND |
| 3 (GND) | Ground Reference | 0 V 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 external supply via resistive divider |
| 5 (PFO) | Power Fail Output | Active-low open-drain output signaling supply drop below PFI threshold |
| 6 (WDI) | Watchdog Input | Three-level input; toggling resets 1.60 sec watchdog timer; floating disables watchdog |
| 7 (RESET) | Reset Output | Active-low push-pull output; held low for 200 ms after VCC rise or MR release |
| 8 (WDO) | Watchdog Output | Active-low open-drain output; goes low on timeout or VCC < 4.65 V; can drive MR for system reset |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET below 1 V VCC | Ensures microprocessor remains held in reset during full power-rail collapse and brownout recovery |
| Integrated watchdog timer | 1.60 sec timeout detects software hangs without requiring external timing components |
| Debounced MR input | Eliminates mechanical switch bounce and EMI-induced false resets without external RC filtering |
| Dual-supply monitoring capability | PFI/PFO pair enables early warning of auxiliary supply failure (e.g., backup battery, analog rails) |
| Low quiescent current | 190 µA operation supports always-on supervision in battery-powered or energy-sensitive systems |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Monitors main 5 V DC-DC converter and backup battery voltage in programmable logic controller chassis. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and watchdog-triggered fail-safe shutdown. Use Value: Prevents corrupted I/O state during unstable power conditions and forces controlled reboot upon firmware hang. | Use Scenario: Ensures deterministic startup and runtime integrity of FPGA-based imaging subsystem in portable ultrasound device. IC Role / Device Role / Timing Role: Dual-role supervisor: generates 200 ms power-on reset and monitors real-time processor activity via WDI. Use Value: Guarantees safe initialization sequence and prevents erroneous image acquisition due to undetected software lockup. |
| Smart Energy Meter | Automated Test Equipment |
Use Scenario: Supervises 5 V logic rail and monitors supercapacitor backup voltage during mains outage in DIN-rail meter. IC Role / Device Role / Timing Role: Voltage monitor and power-fail detector using PFI/PFO to trigger data save before shutdown. Use Value: Enables lossless nonvolatile memory write completion using remaining backup energy, meeting IEC 62053-21 requirements. | Use Scenario: Provides robust reset coordination across multiple FPGAs and ADC/DAC subsystems in modular ATE mainframe. IC Role / Device Role / Timing Role: Centralized reset arbiter with manual reset override (MR) and watchdog supervision of host controller. Use Value: Eliminates race conditions during power-up and ensures synchronized subsystem recovery after fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705CSA+ | 4.65 V reset threshold, 200 ms timeout, same SOIC-8 package but higher 25 µA max VCC current at 1 V | Lacks integrated watchdog timer; requires external circuitry for processor activity monitoring | Select when watchdog functionality is unnecessary and ultra-low 1 V supply current is critical |
| TPS3808G33DBVR | 3.3 V fixed reset threshold, adjustable watchdog (1.25 ms–10 s), 1.6 µA quiescent current, SOT-23-6 | Not pin-compatible; lower voltage rating limits use to 3.3 V systems only | Select for 3.3 V domains requiring extended watchdog flexibility and minimal power draw |
Compared with MAX705CSA+ and TPS3808G33DBVR, the ADM705AR-REEL uniquely combines 5 V supervision, integrated 1.60 sec watchdog, and guaranteed 1 V reset validity in a standard SOIC-8 footprint-making it optimal for legacy 5 V industrial controllers where reliability under brownout and software fault conditions is paramount.
Availability
ADM705AR-REEL is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic instruments, smart energy meters, and automated test equipment requiring stable component supply across long production lifecycles.
Supply support for ADM705AR-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 ADM705/ADM706 family was designed specifically for robust 5 V microprocessor supervision in harsh environments-emphasizing low-voltage reset validity, integrated watchdog safety, and seamless integration with manual reset switches and power-fail warning circuits.
FAQ
What is the reset threshold voltage for ADM705AR-REEL?
The ADM705AR-REEL has a nominal reset threshold of 4.65 V with ±0.15 V tolerance and 40 mV hysteresis. This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The threshold ensures reliable reset assertion before the 5 V supply falls to levels that could cause microprocessor malfunction, and it remains valid even as VCC drops to 1 V.
Does ADM705AR-REEL include a watchdog timer function?
Yes, the ADM705AR-REEL integrates a watchdog timer with a nominal timeout period of 1.60 seconds. The timer resets on any transition (high-to-low or low-to-high) at the WDI pin. If no transition occurs within the timeout window, the WDO output goes low. This feature is confirmed in the functional block diagram, specifications table, and circuit information section of the ADM705/ADM706/ADM707/ADM708 datasheet Rev. H.
Can ADM705AR-REEL operate with supply voltages below 5 V?
Yes, ADM705AR-REEL operates from VCC = 1.0 V to 5.5 V. Its RESET output remains valid (low) down to 1 V, ensuring continuous microprocessor hold during brownout and power-up sequences. Quiescent current is specified at 190 µA typical across this range, and all logic thresholds (MR, WDI) remain functional per datasheet test conditions.
What package type is used for ADM705AR-REEL?
ADM705AR-REEL uses an 8-lead Standard Small Outline Package (SOIC_N), also designated R-8 per JEDEC MS-012-AA. It features a 1.27 mm lead pitch, gull-wing leads, and is supplied on tape-and-reel (REEL designation). Pin 1 is marked by a notch or beveled corner, and thermal resistance θJA is 110°C/W.
How does the power-fail detection work on ADM705AR-REEL?
The ADM705AR-REEL includes a dedicated power-fail comparator with a fixed 1.25 V internal reference. The PFI pin serves as the noninverting input; when external voltage applied to PFI drops below 1.25 V, the open-drain PFO output pulls low. This allows monitoring of secondary supplies (e.g., backup batteries) using a simple resistor divider, and PFO can directly drive interrupts or reset lines.
ADM705AR-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:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM705AR-REEL FAQ
1.How can I place an order for ADM705AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM705AR-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 ADM705AR-REEL reliable?
The price and inventory of ADM705AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM705AR-REEL is usually 5 days.
3.What payment methods are accepted for ADM705AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM705AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM705AR-REEL?
ADM705AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM705AR-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 ADM705AR-REEL?
For technical support, including ADM705AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM705AR-REEL requirements.
6.How does Aetrix verify that ADM705AR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM705AR-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 ADM705AR-REEL meets industry standards.
7.What is the process for return or replacement of ADM705AR-REEL?
All ADM705AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM705AR-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 ADM705AR-REEL part is unused and in its original packaging.
Return procedure for ADM705AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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