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Analog Devices Inc. ADM9690ARNZ-REEL
- Part No.:
- ADM9690ARNZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM9690ARNZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,205
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Product details
Overview
ADM9690ARNZ-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 ms to 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-up sequencing and stall detection.
For engineers reviewing the ADM9690ARNZ-REEL datasheet, ADM9690ARNZ-REEL pinout, ADM9690ARNZ-REEL application, or ADM9690ARNZ-REEL equivalent, key selection criteria include dual-reset timing asymmetry (t1 = 50 ms, t2 = 60 ms), WDI edge-triggered watchdog restart logic, industrial temperature range (–40°C to +85°C), and SOIC-8 package compatibility with legacy 5 V µP systems.
Technical Context
The ADM9690ARNZ-REEL integrates two independent supervision functions: a precision voltage monitor comparing VMON against a 4.31 V threshold with 30 mV hysteresis, and a configurable watchdog timer triggered by transitions on WDI. Both functions assert RESET(1) and RESET(2) simultaneously but with staggered deassertion timing.
Its dual-reset architecture implements distinct timing roles: RESET(1) provides a 50 ms power-on or watchdog-induced reset pulse for the microprocessor, while RESET(2) extends the active-low state by 10 ms to hold auxiliary circuitry (e.g., memory, peripherals) in reset until µP initialization completes - a design requirement verified in typical application circuits per Figure 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Threshold | 4.31 V ±0.11 V - precise detection of 5 V rail collapse with guaranteed 4.2 V–4.42 V window across temperature. |
| RESET(1) Timeout | 50 ms - fixed duration low pulse for primary µP reset, ensuring sufficient boot stabilization time. |
| RESET(2) Timeout | 60 ms - 10 ms extension beyond RESET(1) to delay auxiliary circuit release until µP regains control. |
| Watchdog Periods | Selectable: 0.75 ms / 1.5 ms / 12.5 ms / 25 ms - four discrete timeouts via SEL1/SEL2 pins for tuning to µP instruction cycle or task loop duration. |
| Supply Voltage Range | 4.3 V to 5.5 V - supports nominal 5 V systems with tolerance for brownout conditions; functional down to 2 V VCC. |
| WDI Input Sensitivity | 100 ns minimum pulsewidth, 0.8 V / 3.5 V logic thresholds - robust edge detection even under noisy µP I/O conditions. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating. |
Pinout & Package
The ADM9690ARNZ-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 and tape-and-reel packaged (REEL suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | +5 V main supply rail connection; device operates from 4.3 V to 5.5 V, remains functional down to 2 V during brownout. |
| VMON | Voltage monitoring input | Monitors external 5 V rail via resistor divider; asserts reset when falling below 4.31 V threshold. |
| GND | Ground reference | Common 0 V return for all analog and digital signals; must be low-impedance path to avoid false resets. |
| RESET(1) | Primary reset output | Active-low open-drain output; holds µP in reset for exactly 50 ms after VMON recovery or WDI timeout. |
| RESET(2) | Secondary reset output | Active-low open-drain output; mirrors RESET(1) but remains low for full 60 ms to sequence auxiliary logic. |
| WDI | Watchdog input | Edge-sensitive input; any rising or falling transition restarts watchdog timer; floating or mid-supply disables function. |
| SEL1, SEL2 | Timeout configuration inputs | Digital select lines setting one of four watchdog periods (0.75/1.5/12.5/25 ms); logic levels referenced to VCC/GND. |
Key Features
| Feature | Design Value |
|---|---|
| Dual asymmetric reset outputs | Enables staged system initialization: RESET(1) boots µP, RESET(2) delays peripheral enable until µP firmware confirms readiness. |
| Adjustable watchdog timeout | Four factory-set periods eliminate need for external RC timing components and support diverse µP loop durations. |
| Low supply current (55–100 µA) | Minimizes impact on standby power budget in always-on or battery-backed systems. |
| 2 V minimum VCC operation | Ensures supervision remains active during deep brownout, enabling controlled shutdown before VCC collapses completely. |
| Industrial temperature rating | Validated performance from –40°C to +85°C supports deployment in uncontrolled enclosures and factory automation equipment. |
Applications
| Microprocessor Power-Up Sequencing | Embedded Controller Watchdog Supervision |
|---|---|
Use Scenario: A 5 V-powered industrial PLC controller powers up after mains restoration. IC Role / Device Role / Timing Role: ADM9690ARNZ-REEL monitors VMON to generate synchronized RESET(1)/RESET(2) pulses, ensuring µP boots cleanly before FPGA and ADC peripherals are released. Use Value: Prevents race conditions between µP firmware execution and peripheral register initialization by enforcing 50 ms / 60 ms staggered reset release. | Use Scenario: A medical infusion pump's safety-critical µP runs real-time motor control loops. IC Role / Device Role / Timing Role: ADM9690ARNZ-REEL watches WDI toggled by µP's heartbeat ISR; triggers dual reset if loop stalls >12.5 ms (SEL1=0, SEL2=1). Use Value: Guarantees fail-safe shutdown within defined timing bounds, meeting IEC 62304 Class B software safety requirements. |
| Printer Mainboard Voltage Monitoring | Intelligent Power Supply Management |
Use Scenario: An office laser printer experiences transient 5 V rail sag during fuser heater activation. IC Role / Device Role / Timing Role: ADM9690ARNZ-REEL detects VMON dip below 4.31 V and asserts RESET(1)/RESET(2) to halt print engine firmware and protect NVRAM writes. Use Value: Avoids corrupted print job buffers and EEPROM data loss by initiating controlled reset before rail collapse reaches critical level. | Use Scenario: A telecom remote terminal unit uses backup battery during AC failure. IC Role / Device Role / Timing Role: ADM9690ARNZ-REEL supervises both main 5 V rail and battery-backed 3.3 V domain (via resistor divider on VMON), asserting resets only when both supplies violate thresholds. Use Value: Enables graceful switchover and state preservation by coordinating reset assertion across multiple voltage domains. |
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 (RESET), no RESET(2) extension; fixed 1.6 s watchdog timeout; higher quiescent current (120 µA). | Lacks dual-timing capability for staged peripheral release; suitable only where µP reset suffices. | Choose MAX692AESA+ only if secondary reset timing is unnecessary and longer watchdog period is acceptable. |
| TPS3823DBVT | Single reset output; fixed 200 ms watchdog; no SEL inputs; tighter voltage threshold (4.63 V ±0.5%). | Designed for 3.3 V systems; requires level-shifting for 5 V VMON monitoring; no timing flexibility. | Use TPS3823DBVT only in 3.3 V designs or when 4.63 V threshold better matches target rail tolerance. |
Compared with MAX692AESA+ and TPS3823DBVT, the ADM9690ARNZ-REEL uniquely delivers dual asymmetric reset timing and four selectable watchdog periods in a single 5 V–optimized SOIC-8 package - essential for systems requiring coordinated µP and peripheral initialization with configurable fault response latency.
Availability
ADM9690ARNZ-REEL is available at Aetrix Electronics and suitable for microprocessor power-up sequencing, embedded controller watchdog supervision, and intelligent power supply management requiring stable component supply, long-term industrial-grade reliability, and RoHS-compliant packaging.
Supply support for ADM9690ARNZ-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 ADM9690ARNZ-REEL belongs to Analog Devices' power supervision IC product line, engineered specifically for robust, low-power, dual-output reset generation and configurable watchdog monitoring in 5 V microprocessor systems operating across extended industrial temperatures.
FAQ
What is the exact voltage threshold and hysteresis of the ADM9690ARNZ-REEL?
The ADM9690ARNZ-REEL has a nominal voltage threshold of 4.31 V with a guaranteed range of 4.2 V to 4.42 V at TA = 0°C to +70°C. Its reset threshold hysteresis is 30 mV, meaning the rising-edge release point is approximately 4.34 V. This ensures immunity to noise-induced chatter during rail recovery and is confirmed in the "Reset Voltage Threshold" specification table and Figure 2 of the official datasheet.
How does the watchdog timeout selection work on the ADM9690ARNZ-REEL?
The ADM9690ARNZ-REEL uses two digital inputs - SEL1 and SEL2 - to select one of four discrete 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). Each transition (rising or falling) on WDI restarts the timer, and the timer also resets automatically when RESET(1) goes high - behavior explicitly defined in the Functional Block Diagram and Table I.
What are the timing relationships between RESET(1) and RESET(2) during power-up and watchdog events?
During both power-up and watchdog timeout events, RESET(1) and RESET(2) go low simultaneously. RESET(1) remains low for exactly 50 ms, then goes high; RESET(2) stays low for 60 ms total - i.e., 10 ms longer than RESET(1). This 10 ms extension is fixed and non-adjustable, enabling staged release of µP and auxiliary circuitry, as shown in Figures 7 and 8 of the ADM9690ARNZ-REEL datasheet.
Can the ADM9690ARNZ-REEL operate with supply voltages below 5 V?
Yes, the ADM9690ARNZ-REEL operates over a VCC range of 4.3 V to 5.5 V and remains fully functional down to 2 V VCC. Its internal voltage monitor and watchdog circuitry continue supervising VMON and WDI even during severe brownout conditions, allowing controlled reset assertion before complete power loss - a capability verified in the Absolute Maximum Ratings and General Description sections.
Is the ADM9690ARNZ-REEL pin-compatible with other Analog Devices supervisors like the ADM692A?
No, the ADM9690ARNZ-REEL is not pin-compatible with the ADM692A or similar predecessors. It features eight pins in SOIC-8 with dedicated SEL1/SEL2 inputs and dual RESET outputs, whereas the ADM692A uses a different pinout (e.g., PFO, MR) and lacks configurable watchdog timing. Pin mapping must be verified against the ADM9690ARNZ-REEL's PIN CONFIGURATION diagram - no drop-in replacement is supported.
ADM9690ARNZ-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:
- Active
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM9690ARNZ-REEL FAQ
1.How can I place an order for ADM9690ARNZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM9690ARNZ-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 ADM9690ARNZ-REEL reliable?
The price and inventory of ADM9690ARNZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM9690ARNZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM9690ARNZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM9690ARNZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM9690ARNZ-REEL?
ADM9690ARNZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM9690ARNZ-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 ADM9690ARNZ-REEL?
For technical support, including ADM9690ARNZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM9690ARNZ-REEL requirements.
6.How does Aetrix verify that ADM9690ARNZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM9690ARNZ-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 ADM9690ARNZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM9690ARNZ-REEL?
All ADM9690ARNZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM9690ARNZ-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 ADM9690ARNZ-REEL part is unused and in its original packaging.
Return procedure for ADM9690ARNZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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