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Analog Devices Inc. ADM9690ARN-REEL
- Part No.:
- ADM9690ARN-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM9690ARN-REEL.pdf
- Description:
- IC SUPERVISOR PS/WATCHDOG 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
ADM9690ARN-REEL from Analog Devices is a precision 5 V power supply and watchdog timer monitoring circuit with dual reset outputs, 4.31 V voltage threshold, selectable watchdog timeout (0.75–25 ms), and operation down to 2 V VCC. It serves as a system-level supervisor in microprocessor-based embedded control applications requiring reliable power-on and fault-induced reset sequencing.
For engineers reviewing the ADM9690ARN-REEL datasheet, ADM9690ARN-REEL pinout, ADM9690ARN-REEL application, or ADM9690ARN-REEL equivalent, key selection considerations include its dual-reset timing asymmetry (t1 = 50 ms, t2 = 60 ms), SEL1/SEL2-configurable watchdog periods, VMON input tolerance, low 55–100 µA supply current, and industrial temperature range support.
Technical Context
The ADM9690ARN-REEL integrates two independent supervisory functions: a precision voltage monitor comparing VMON against a 4.31 V threshold with 30 mV hysteresis, and a transition-triggered watchdog timer with four discrete timeout options selected via SEL1/SEL2 logic inputs. Both functions drive two synchronized but time-differentiated open-drain RESET outputs.
RESET(1) asserts for exactly 50 ms after VMON recovery or WDI timeout, while RESET(2) extends that assertion by 10 ms-enabling staged deassertion for µP initialization followed by auxiliary circuit release. The watchdog restarts on any WDI edge after RESET(1) goes high, supporting both positive- and negative-going transitions without external conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Threshold | 4.31 V ±0.11 V; precise detection of 5 V rail collapse with 30 mV hysteresis to prevent chatter during brownout recovery. |
| RESET(1) Timeout | 50 ms minimum; ensures sufficient hold time for microprocessor power-on initialization before release. |
| RESET(2) Timeout | 60 ms total (50 + 10 ms); holds peripheral circuitry in reset 10 ms longer than µP to guarantee controlled system boot sequence. |
| Watchdog Periods | Selectable: 0.75 / 1.5 / 12.5 / 25 ms; enables tuning to µP instruction loop duration without software overhead. |
| Supply Current | 55–100 µA typical; supports low-power always-on supervision in battery-backed or energy-constrained systems. |
| Operating Voltage | 4.3–5.5 V VCC; functional down to 2 V on VMON path, allowing supervision during deep brownout conditions. |
| Temperature Range | –40°C to +85°C; qualified for industrial-grade reliability in harsh ambient environments. |
Pinout & Package
ADM9690ARN-REEL is housed in an 8-lead narrow SOIC (SO-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant, tape-and-reel format (REEL suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VMON | Voltage Monitoring Input | Monitors external 5 V rail; triggers reset when falling below 4.31 V threshold. |
| 2: WDI | Watchdog Input | Edge-sensitive input; any transition (rising/falling) within timeout period resets watchdog timer. |
| 3: VCC | Power Supply Input | +5 V supply pin; device operates across 4.3–5.5 V with full functionality down to 2 V on VMON path. |
| 4: GND | Ground Reference | Common return for all analog and digital signals; required for accurate threshold comparison and output sinking. |
| 5: SEL1 | Watchdog Timeout Select | Logic input (0/1) used with SEL2 to configure one of four watchdog periods per Table I. |
| 6: SEL2 | Watchdog Timeout Select | Logic input (0/1) used with SEL1 to configure one of four watchdog periods per Table I. |
| 7: RESET(1) | Primary Reset Output | Open-drain output; active-low for ≥50 ms after fault detection or power-up; drives µP reset input. |
| 8: RESET(2) | Secondary Reset Output | Open-drain output; active-low for ≥60 ms (50 + 10 ms); holds peripherals in reset until µP regains control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Asymmetric Reset Outputs | RESET(1) and RESET(2) provide staggered deassertion (50 ms vs. 60 ms) to coordinate µP boot and peripheral enable timing. |
| Four-Step Watchdog Timeout | Hardware-selectable periods (0.75/1.5/12.5/25 ms) eliminate firmware configuration and reduce code footprint. |
| Low-Voltage VMON Operation | Continues monitoring VMON down to 2 V VCC, enabling early fault detection during severe brownouts. |
| Edge-Triggered Watchdog | Accepts either rising or falling edges on WDI-no need for dedicated toggle pins or clock gating logic. |
| Industrial Temperature Rating | Specified from –40°C to +85°C, supporting deployment in factory automation, motor controls, and outdoor instrumentation. |
Applications
| Microprocessor Power-On Sequencing | Embedded Controller Fault Recovery |
|---|---|
Use Scenario: System powers up from cold start with 5 V rail ramping through regulation. IC Role / Device Role / Timing Role: ADM9690ARN-REEL monitors VMON and generates RESET(1) for µP core initialization and RESET(2) for delayed peripheral enable. Use Value: Ensures µP exits reset only after stable VCC and releases peripherals 10 ms later-preventing race conditions and bus contention. | Use Scenario: Microcontroller enters infinite loop due to software exception or memory corruption. IC Role / Device Role / Timing Role: ADM9690ARN-REEL detects absence of WDI transitions and asserts both RESET outputs for defined durations. Use Value: Forces hard reset with deterministic timing (50/60 ms), restoring system state without manual intervention or watchdog ISR overhead. |
| Industrial PLC Module Supervision | Point-of-Sale Terminal Power Integrity |
Use Scenario: Programmable Logic Controller experiences intermittent 5 V rail sag during solenoid actuation. IC Role / Device Role / Timing Role: ADM9690ARN-REEL senses VMON dip below 4.31 V and initiates dual-reset sequence to halt I/O execution and reinitialize logic. Use Value: Prevents spurious output activation during rail instability by holding both µP and I/O drivers in reset until full recovery. | Use Scenario: Retail terminal powered from shared AC-DC adapter suffers transient dropout during thermal printer activation. IC Role / Device Role / Timing Role: ADM9690ARN-REEL monitors VMON and WDI simultaneously, triggering reset if either power or µP activity fails. Use Value: Guarantees transaction integrity by resetting system before corrupted data commits to flash or network interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply and watchdog monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Single reset output; fixed 1.6 s watchdog timeout; no SEL1/SEL2 programmability; higher quiescent current (120 µA). | Lacks dual-reset staging and adjustable watchdog-suitable only where extended reset hold is unnecessary. | Choose when simplicity and legacy compatibility outweigh timing flexibility and low-power needs. |
| TPS3823DBVR | Single reset output; fixed 200 ms watchdog; no VMON hysteresis spec; lower voltage threshold (3.08 V); SOT-23-5 package. | Not suitable for 5 V systems requiring 4.31 V trip point or dual-output coordination. | Consider only for 3.3 V domains with basic watchdog coverage and space-constrained layouts. |
Compared with MAX692AESA+ and TPS3823DBVR, the ADM9690ARN-REEL uniquely delivers dual asymmetric reset timing, hardware-selectable watchdog periods, and precise 4.31 V supervision-making it optimal for 5 V microprocessor systems demanding coordinated boot and robust fault recovery.
Availability
ADM9690ARN-REEL is available at Aetrix Electronics and suitable for microprocessor power-on sequencing, embedded controller fault recovery, and industrial PLC module supervision requiring stable component supply and long-term lifecycle support.
Supply support for ADM9690ARN-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 ADM9690ARN-REEL belongs to Analog Devices' power supervision IC family, engineered specifically for deterministic reset generation and watchdog monitoring in 5 V microprocessor systems operating across industrial temperature ranges.
FAQ
What is the exact reset voltage threshold for ADM9690ARN-REEL?
The ADM9690ARN-REEL has a nominal reset voltage threshold of 4.31 V, with guaranteed min/max limits of 4.2 V and 4.42 V over the industrial temperature range. This threshold applies to the VMON input and features 30 mV hysteresis to prevent oscillation during slow-rising or noisy supply conditions. The value is laser-trimmed at wafer test and does not require external calibration.
How does the watchdog timeout selection work on ADM9690ARN-REEL?
The ADM9690ARN-REEL uses two logic inputs-SEL1 and SEL2-to select one of four watchdog timeout periods: 0.75 ms (SEL2=0, SEL1=0), 1.5 ms (SEL2=0, SEL1=1), 12.5 ms (SEL2=1, SEL1=0), or 25 ms (SEL2=1, SEL1=1). These inputs are referenced to VCC/GND and draw less than ±1 µA, enabling direct connection to µP GPIO or static bias resistors without loading.
What is the timing relationship between RESET(1) and RESET(2) during a power-fail event?
During a power-fail event, both RESET(1) and RESET(2) go low simultaneously when VMON falls below 4.31 V. After VMON recovers above threshold, RESET(1) remains low for 50 ms minimum, while RESET(2) stays low for 60 ms total-extending 10 ms beyond RESET(1). This staged release ensures µP reset completes before peripherals are enabled, preventing bus conflicts or undefined states.
Can ADM9690ARN-REEL operate with a 3.3 V supply?
No-the ADM9690ARN-REEL is specified for 4.3 V to 5.5 V VCC operation and designed for 5 V systems. Its 4.31 V voltage monitor threshold and internal reference architecture are optimized for 5 V rails. For 3.3 V supervision, Analog Devices offers alternatives like the ADM692A or ADM1085, but those lack the dual-reset and selectable watchdog features of the ADM9690ARN-REEL.
Is ADM9690ARN-REEL pin-compatible with other Analog Devices supervisors?
No-ADM9690ARN-REEL has a unique 8-pin SOIC pinout optimized for dual reset, VMON, WDI, and SEL inputs. It is not pin-compatible with the ADM692A (8-pin SOIC but different function mapping), ADM809 (3-pin SOT-23), or ADM1085 (5-pin SOT-23). Board layout must follow the specific ADM9690ARN-REEL pin configuration shown in the datasheet top view.
ADM9690ARN-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.31V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms, 50ms Typical
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM9690ARN-REEL FAQ
1.How can I place an order for ADM9690ARN-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM9690ARN-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 ADM9690ARN-REEL reliable?
The price and inventory of ADM9690ARN-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM9690ARN-REEL is usually 5 days.
3.What payment methods are accepted for ADM9690ARN-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM9690ARN-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM9690ARN-REEL?
ADM9690ARN-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM9690ARN-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 ADM9690ARN-REEL?
For technical support, including ADM9690ARN-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM9690ARN-REEL requirements.
6.How does Aetrix verify that ADM9690ARN-REEL is sourced from the original manufacturer or authorized distributors?
All ADM9690ARN-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 ADM9690ARN-REEL meets industry standards.
7.What is the process for return or replacement of ADM9690ARN-REEL?
All ADM9690ARN-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM9690ARN-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 ADM9690ARN-REEL part is unused and in its original packaging.
Return procedure for ADM9690ARN-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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