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Analog Devices Inc. ADM690AANZ
- Part No.:
- ADM690AANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM690AANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
ADM690AANZ 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 Ω on-resistance. It ensures reliable power-up/down/brownout reset for +5 V systems and supports CMOS RAM backup in industrial controllers.
For engineers reviewing the ADM690AANZ datasheet, ADM690AANZ pinout, ADM690AANZ application, or ADM690AANZ equivalent, key selection criteria include guaranteed reset operation down to 1 V VCC, ±2% PFI threshold accuracy (1.25 V), low 100 µA quiescent current, and compatibility with legacy MAX690A designs requiring space-constrained layouts.
Technical Context
The ADM690AANZ integrates four core functions: a precision bandgap-based voltage monitor with 4.65 V reset threshold, a transition-detecting watchdog timer with 1.6 s timeout and three-level WDI input, a battery switchover switch using PMOS topology with 20 mV hysteresis, and a dedicated 1.25 V reference-based power fail comparator with open-drain PFO output.
Its internal architecture guarantees RESET remains functional even as VCC decays to 1 V, supports bidirectional reset line interfacing via external current-limiting resistors, and enables noise-immune PFI sensing through externally added hysteresis resistors-without requiring external components for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±150 mV - Ensures deterministic reset initiation during +5 V supply brownout before microprocessor instability. |
| Reset Timeout Delay | 200 ms - Provides sufficient stabilization time for power supply and CPU after power-up before releasing reset. |
| Watchdog Timeout | 1.6 s - Detects firmware lockup by requiring periodic WDI transitions; restarts on each high/low edge. |
| VCC Operating Range | 1.0 V to 5.5 V - Guarantees RESET assertion integrity down to near-dead-battery conditions. |
| Quiescent Current | 100 µA - Minimizes standby power draw in always-on embedded systems with battery backup. |
| Battery Switchover Hysteresis | 40 mV - Prevents oscillation during VCC/VBATT crossover transitions during power recovery. |
| PFI Threshold Accuracy | ±2% (1.25 V) - Enables precise early-warning power-fail detection with minimal external component tolerance dependence. |
Pinout & Package
ADM690AANZ is housed in an 8-lead microSOIC (RM-8) package measuring 3.10 mm × 3.05 mm × 0.95 mm, optimized for high-density PCB layouts while maintaining SOIC-compatible footprint geometry and thermal performance (θJA = 110°C/W).
| 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 | Provides seamless switchover to backup source when VCC drops below reset threshold and VBATT > VCC + 20 mV. |
| VOUT | Switched output rail | Delivers either VCC or VBATT (whichever is higher and valid) to RAM or low-power peripherals; supports up to 100 mA load. |
| GND | Ground reference | Common return path for all analog and digital functions; required for accurate threshold referencing. |
| PFI | Power fail comparator input | Non-inverting input of 1.25 V referenced comparator; used with external resistor divider to detect falling input supply. |
| PFO | Power fail comparator output | Open-drain output asserting low when PFI < 1.25 V; drives NMI or interrupt lines directly. |
| RESET | Active-low reset output | Push-pull output asserting low during power failure, brownout, or watchdog timeout; sinks 3.2 mA minimum. |
| WDI | Watchdog timer input | Three-level input (high/low/floating); toggling resets 1.6 s timer; floating disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset Below 1 V VCC | Enables fail-safe shutdown sequencing in ultra-low-voltage brownout scenarios without external supervision. |
| Integrated 1.25 V Precision Reference | Eliminates need for external reference IC when implementing PFI-based power-fail warning or secondary supply monitoring. |
| Automatic Battery Switchover with 20 mV Hysteresis | Prevents chattering during VCC recovery; supports lithium, coin-cell, or supercapacitor backup sources without external MOSFETs. |
| Watchdog Input with Transition Detection | Detects both stuck-high and stuck-low software faults-not just missing pulses-enhancing reliability in safety-critical firmware. |
| MicroSOIC (RM-8) Package | Reduces board area by ~50% vs. standard SOIC-8 while retaining compatible solder profile and thermal dissipation. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Power monitoring and RAM retention during mains interruption in programmable logic controller modules operating in factory environments. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM power switchover, and watchdog-triggered recovery from firmware hangs. Use Value: Maintains volatile configuration data across 100+ ms power gaps and prevents uncontrolled state transitions during voltage sag-meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Ensuring deterministic boot sequence and memory integrity in portable ultrasound or patient monitor units with dual-supply architectures. IC Role / Device Role / Timing Role: Reset generator and power-fail detector coordinating main DC/DC converter shutdown with backup capacitor discharge management. Use Value: Delivers 200 ms reset hold time synchronized to battery switchover latency, enabling safe save-to-flash of vital patient parameters before power loss. |
| Point-of-Sale Terminals | Telecom Line Cards |
Use Scenario: Securing transaction log integrity during unexpected AC dropout or hot-swap power module replacement in retail payment systems. IC Role / Device Role / Timing Role: Active-low reset supervisor with PFO-driven interrupt signaling to initiate graceful log flush prior to full power collapse. Use Value: Uses 1.25 V PFI threshold with ±2% accuracy to trigger 5–10 ms advance warning before VCC decay breaches 4.65 V reset point-enabling atomic write completion. |
Use Scenario: Managing power sequencing and fault recovery in carrier-grade Ethernet line cards exposed to transient surges and thermal cycling. IC Role / Device Role / Timing Role: Dual-role device acting as both primary reset source and secondary watchdog enforcer for FPGA-based control processors. Use Value: Combines 1.6 s watchdog timeout with 100 µA quiescent current to sustain supervision during extended low-power sleep modes without compromising responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690AESA+ | Pin-compatible but uses older BiCMOS process; higher 120 µA quiescent current; no guaranteed operation below 2.7 V VCC. | Lacks 1 V reset guarantee and tighter PFI accuracy; unsuitable for ultra-low-VCC brownout resilience. | Select only if legacy MAX690A footprint reuse is mandatory and 1 V operation is not required. |
| TPS3808G33DBVR | Single-function reset IC with 3.3 V threshold; no battery switchover, watchdog, or PFI/PFO functions; SOT-23-6 package. | Requires external components to replicate ADM690AANZ's integrated functionality; increases BOM count and layout complexity. | Choose only when supervisory requirements are limited to basic 3.3 V reset generation with minimal footprint. |
Compared with MAX690AESA+, ADM690AANZ delivers lower power, wider VCC range, and superior PFI accuracy; versus TPS3808G33DBVR, it provides full integration of reset, watchdog, battery switchover, and power-fail detection in one microSOIC device-reducing system-level component count by ≥4.
Availability
ADM690AANZ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and telecom infrastructure applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM690AANZ 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 ADM690AANZ belongs to Analog Devices' microprocessor supervisory IC 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 ADM690AANZ reset assertion?
The ADM690AANZ guarantees RESET assertion down to 1.0 V VCC, ensuring fail-safe microprocessor hold condition even during deep brownout events. This specification is validated across the full –40°C to +85°C industrial temperature range and is independent of VBATT presence. The ADM690AANZ maintains this capability due to its proprietary low-voltage bandgap reference and rail-to-rail output stage design.
Does ADM690AANZ support active-high reset output?
No, ADM690AANZ provides only active-low RESET output. The active-high variant is implemented in the ADM805L/M family members (e.g., ADM805LAN), not in the ADM690A series. Attempting to invert ADM690AANZ's RESET output externally requires careful attention to timing margins and drive strength, as the push-pull output is rated for 3.2 mA sink but only 800 µA source current at VCC – 1.5 V.
How does the ADM690AANZ watchdog timer respond to WDI signal states?
The ADM690AANZ watchdog timer triggers RESET if WDI remains static (high or low) for longer than 1.6 seconds. Each rising or falling edge on WDI resets the timeout counter. If WDI is left floating or driven by a high-impedance tri-state buffer, the watchdog is automatically disabled-no external pull-up/down resistors are needed for disablement.
What is the maximum load current ADM690AANZ can deliver through VOUT in battery backup mode?
In battery backup mode (VCC < VBATT – 0.2 V), ADM690AANZ delivers up to 250 µA through VOUT with a dropout voltage of ≤5 mV, verified at VBATT = 2.8 V. This current level is sufficient for CMOS RAM retention but not for active logic; external buffering or capacitive hold-up is required for higher peak loads.
Can ADM690AANZ be used with lithium coin-cell batteries without risk of overcharging?
Yes, ADM690AANZ is safe for direct connection to lithium coin cells because its VBATT terminal sources only ≤0.1 µA charging current-well below the 1 µA self-discharge compensation threshold of CR2032 and similar cells. This eliminates need for blocking diodes or charge-limiting resistors in typical backup configurations.
ADM690AANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM690AANZ FAQ
1.How can I place an order for ADM690AANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM690AANZ 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 ADM690AANZ reliable?
The price and inventory of ADM690AANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM690AANZ is usually 5 days.
3.What payment methods are accepted for ADM690AANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM690AANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM690AANZ?
ADM690AANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM690AANZ 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 ADM690AANZ?
For technical support, including ADM690AANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM690AANZ requirements.
6.How does Aetrix verify that ADM690AANZ is sourced from the original manufacturer or authorized distributors?
All ADM690AANZ 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 ADM690AANZ meets industry standards.
7.What is the process for return or replacement of ADM690AANZ?
All ADM690AANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM690AANZ, 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 ADM690AANZ part is unused and in its original packaging.
Return procedure for ADM690AANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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