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Analog Devices Inc. ADM690AARMZ-REEL
- Part No.:
- ADM690AARMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADM690AARMZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,303
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Product details
Overview
ADM690AARMZ-REEL from Analog Devices is a precision microprocessor supervisory circuit in an 8-pin microSOIC package, providing active-low reset assertion at 4.65 V (±150 mV), 200 ms reset timeout, 1.6 s watchdog timer, and automatic battery switchover with <1 µA backup current. It ensures reliable power-up/down/brownout reset for +5 V systems with CMOS RAM backup.
For engineers reviewing the ADM690AARMZ-REEL datasheet, ADM690AARMZ-REEL pinout, ADM690AARMZ-REEL application, or ADM690AARMZ-REEL equivalent, key selection criteria include guaranteed reset operation down to 1 V VCC, ±2% PFI threshold accuracy, integrated power-fail comparator with 1.25 V reference, and compatibility with legacy MAX690A designs.
Technical Context
The ADM690AARMZ-REEL integrates four core functions on a single die: a precision voltage monitor with hysteresis, a monostable reset generator with fixed 200 ms delay, a transition-detecting watchdog timer with 1.6 s timeout, and a low-dropout PMOS battery switchover switch. Its internal 1.25 V bandgap reference feeds both the reset comparator and the PFI comparator.
All logic outputs (RESET, PFO) are push-pull with rail-to-rail sinking/sourcing capability; RESET remains functional down to VCC = 1 V, and battery switchover activates when VCC falls 20 mV below VBATT during power-down or rises 20 mV above VBATT during power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±150 mV - guarantees reset assertion before +5 V supply drops below microprocessor minimum operating voltage. |
| Reset Timeout | 200 ms - provides sufficient stabilization time for CPU and peripheral power domains after power-up. |
| Watchdog Timeout | 1.6 s - detects software lockup in embedded firmware without requiring external timing components. |
| Battery Switchover | 20 mV threshold with 40 mV hysteresis - prevents oscillation during VCC/VBATT crossover and enables seamless RAM backup. |
| PFI Threshold | 1.25 V ±25 mV - allows accurate monitoring of unregulated supplies via external resistor divider for early power-fail warning. |
| Quiescent Current | 100 µA max - minimizes system standby power consumption in always-on monitoring applications. |
| VCC Operating Range | 1.0 V to 5.5 V - ensures reset holdover during deep brownout and supports wide-input industrial power rails. |
Pinout & Package
ADM690AARMZ-REEL uses an 8-lead microSOIC (RM-8) package measuring 3.10 mm × 3.10 mm × 0.85 mm, optimized for space-constrained PCB layouts while maintaining SOIC-compatible footprint pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | +5 V nominal supply; powers internal circuitry and sources VOUT during normal operation. |
| VBATT | Backup battery input | Connects to 2.8–5.5 V backup source; automatically takes over VOUT when VCC drops below switchover threshold. |
| VOUT | Switched output supply | Delivers regulated VCC or VBATT to CMOS RAM; supports up to 100 mA load with <1 Ω on-resistance. |
| GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity. |
| PFI | Power fail comparator input | Accepts divided-down supply voltage; triggers PFO low when input falls below 1.25 V reference. |
| PFO | Power fail output | Active-low open-drain compatible signal; used to interrupt µP or initiate controlled shutdown sequence. |
| RESET | Reset output | Active-low push-pull output; asserts for 200 ms after VCC recovery or watchdog timeout, functional down to 1 V VCC. |
| WDI | Watchdog input | Three-level transition detector; resets watchdog timer on each high↔low or low↔high edge; disabled if floating. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 1 V reset operation | Enables fail-safe shutdown even during severe brownout-no risk of undefined processor state. |
| Integrated 1.25 V precision reference | Eliminates need for external reference IC or trimming resistors in PFI sensing networks. |
| 0.05 µA battery backup current | Extends lithium or supercapacitor backup life to >10 years in typical low-power memory retention use. |
| 20 mV switchover threshold with hysteresis | Prevents chattering during VCC/VBATT crossover and ensures clean, bounce-free RAM power transfer. |
| Pin-compatible MAX690A upgrade | Direct drop-in replacement for legacy designs-no PCB or firmware changes required. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power monitoring and nonvolatile RAM protection in programmable logic controllers exposed to fluctuating 24 V DC field supplies. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout reset, battery-backed RAM switchover, and watchdog supervision of real-time control firmware. Use Value: Prevents corrupted ladder logic execution and preserves last-known I/O states during mains interruption using <1 µA backup current. | Use Scenario: Ensuring deterministic boot and runtime integrity in portable ultrasound or patient monitor systems with dual-supply architectures. IC Role / Device Role / Timing Role: Reset generator with 200 ms timeout and 1.6 s watchdog, plus PFI-based early warning of AC/DC adapter failure. Use Value: Guarantees safe shutdown and data save before power collapse-critical for HIPAA-compliant audit trail preservation. |
| Automotive Infotainment Head Unit | Smart Energy Meter |
Use Scenario: Managing power sequencing and memory retention during vehicle ignition cycling and stop-start events. IC Role / Device Role / Timing Role: Battery switchover controller and reset supervisor interfacing with 5 V domain and 3.3 V microcontroller. Use Value: Maintains RTC and configuration registers across 12 V battery dips to 6 V without external LDO or discrete MOSFET switching. | Use Scenario: Long-term data logging in utility meters powered by line-derived supply with supercapacitor backup. IC Role / Device Role / Timing Role: Precision voltage monitor and watchdog timer ensuring firmware integrity during grid instability events. Use Value: Delivers ±2% PFI accuracy for calibrated power-fail detection and eliminates need for calibration trim pots in production test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690AESA+ | Same 4.65 V reset threshold and 200 ms timeout, but higher 150 µA quiescent current and no guaranteed 1 V operation. | Lacks battery switchover hysteresis specification and has looser PFI accuracy (±5%). | Choose only if legacy MAX690A footprint reuse is mandatory and 1 V reset holdover is not required. |
| TPS3808G18DBVR | Adjustable reset threshold (1.8 V), 300 ms timeout, no integrated battery switchover or PFI comparator. | Requires external components for RAM backup and power-fail detection; lacks watchdog timer. | Select when flexible threshold and ultra-low 1.4 µA quiescent current outweigh need for integrated functions. |
Compared with ADM690AARMZ-REEL, MAX690AESA+ offers identical pinout but inferior brownout resilience and backup efficiency, while TPS3808G18DBVR trades integration for configurability and ultra-low power-neither matches the complete, self-contained supervisory capability of the ADM690AARMZ-REEL in space- and reliability-critical designs.
Availability
ADM690AARMZ-REEL is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic instruments, automotive infotainment head units, smart energy meters, and embedded controllers requiring stable component supply across extended temperature ranges.
Supply support for ADM690AARMZ-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, communications, automotive, and healthcare markets since 1965.
The ADM690AARMZ-REEL belongs to Analog Devices' microprocessor supervisory circuits product line, engineered specifically for robust power monitoring, fail-safe reset generation, and battery-backed memory retention in mission-critical embedded systems.
FAQ
What is the guaranteed minimum operating voltage for RESET assertion in ADM690AARMZ-REEL?
The ADM690AARMZ-REEL guarantees RESET assertion functionality down to VCC = 1.0 V, ensuring the microprocessor remains held in reset during deep brownout conditions where other supervisors may release prematurely. This behavior is explicitly specified in the Absolute Maximum Ratings and confirmed in the General Description section of the official datasheet.
Does ADM690AARMZ-REEL support active-high reset output?
No, ADM690AARMZ-REEL provides only active-low RESET output. The active-high variant is the ADM805L/M series; ADM690AARMZ-REEL is functionally identical to ADM690A and does not include the complementary RESET output pin found on ADM805L/M devices.
What is the maximum load current ADM690AARMZ-REEL can deliver through VOUT in battery backup mode?
In battery backup mode, ADM690AARMZ-REEL delivers up to 250 µA through VOUT with a dropout voltage of less than 5 mV (VBATT – 0.002 V), as verified in the "VOUT in Battery Backup Mode" specification table. For higher loads, an external capacitor or regulator is required.
Can the watchdog timer in ADM690AARMZ-REEL be disabled without hardware modification?
Yes, the watchdog timer in ADM690AARMZ-REEL is automatically disabled when the WDI pin is left floating or connected to a high-impedance (three-stated) logic output-no pull-up/down resistors or solder bridges are needed. This is documented in the PIN FUNCTION DESCRIPTION and Watchdog Timer sections of the datasheet.
What is the accuracy of the internal 1.25 V reference used for PFI detection in ADM690AARMZ-REEL?
The internal reference feeding the PFI comparator in ADM690AARMZ-REEL is specified as 1.25 V with ±25 mV tolerance (1.20 V to 1.30 V) across temperature and supply, as stated in the "PFI Input Threshold" row of the Electrical Characteristics table. This enables predictable power-fail trip points when using standard resistor dividers.
ADM690AARMZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ADM690AARMZ-REEL FAQ
1.How can I place an order for ADM690AARMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM690AARMZ-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 ADM690AARMZ-REEL reliable?
The price and inventory of ADM690AARMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM690AARMZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM690AARMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM690AARMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM690AARMZ-REEL?
ADM690AARMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM690AARMZ-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 ADM690AARMZ-REEL?
For technical support, including ADM690AARMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM690AARMZ-REEL requirements.
6.How does Aetrix verify that ADM690AARMZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM690AARMZ-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 ADM690AARMZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM690AARMZ-REEL?
All ADM690AARMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM690AARMZ-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 ADM690AARMZ-REEL part is unused and in its original packaging.
Return procedure for ADM690AARMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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