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Analog Devices Inc. ADM690ANZ
- Part No.:
- ADM690ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM690ANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:186
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Product details
Overview
ADM690ANZ from Analog Devices is an 8-pin DIP microprocessor supervisory circuit providing power-on reset, battery backup switchover, watchdog timer (1.6 s fixed), and power-fail warning for +5 V systems. It asserts RESET down to 1 V VCC, delivers up to 100 mA at VOUT with ≤0.5 V dropout, and features 4.65 V reset threshold with 40 mV hysteresis-designed for industrial microcontroller-based instrumentation requiring reliable brownout protection and nonvolatile memory retention.
For engineers reviewing the ADM690ANZ datasheet, ADM690ANZ pinout, ADM690ANZ application, or ADM690ANZ equivalent, this page delivers verified functional specifications, validated pin roles, confirmed industrial-temperature operation (–40°C to +85°C), and real-world use cases in battery-backed controllers and embedded computing platforms where deterministic reset timing and seamless VCC/VBATT handover are critical.
Technical Context
The ADM690ANZ integrates a precision 4.65 V reset comparator with sub-1 µs response time and guaranteed operation down to 1 V VCC, enabling robust hold-reset during deep brownouts. Its internal PMOS VCC-to-VOUT switch exhibits 1.5 Ω on-resistance and supports 100 mA continuous output, while the 20 Ω NMOS VBATT-to-VOUT switch enables ultra-low-quiescent backup mode (0.6 µA typical).
A dedicated 1.3 V PFI comparator provides early power-fail warning with <1 µs propagation delay, and the fixed 1.6 s watchdog timer monitors WDI transitions without external components-both functions remain active during battery backup per Table II, with RESET, LOW LINE, and PFO asserting defined logic states when VCC drops below VBATT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V (min 4.5 V, max 4.73 V) - ensures compatibility with ±5% 5 V supplies and guarantees reset assertion before microprocessor malfunction. |
| Reset Pulse Width | 50 ms (typical) - provides sufficient stabilization time for 8051/ARM Cortex-M boot sequences after power-up or brownout recovery. |
| VOUT Drive Capability | 100 mA @ VCC – 0.5 V - powers CMOS RAM banks directly without external pass transistors in most embedded designs. |
| Battery Backup Current | 0.6 µA (typical) - extends lithium coin-cell life beyond 10 years in always-on instrumentation applications. |
| Watchdog Timeout | 1.6 s (fixed, no external components) - detects firmware lockups in systems lacking clocked I/O toggling capability. |
| Power-Fail Threshold | 1.3 V (±50 mV) - enables early warning of supply collapse via resistor divider, allowing 5–10 ms of safe shutdown time. |
| Operating Temperature | –40°C to +85°C - qualified for industrial control cabinets and automotive under-hood environments with thermal cycling. |
Pinout & Package
ADM690ANZ is housed in an 8-pin plastic DIP (N-8) package with 0.3-inch body width and through-hole mounting. Pin spacing conforms to JEDEC MS-001, with 0.1-inch lead pitch and tin-lead plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | +5 V nominal supply; powers all internal circuits and sources VOUT during normal operation. |
| VBATT | Backup battery input | Accepts 2.0–4.25 V backup source; internally compared to VCC to trigger automatic switchover. |
| VOUT | Switched output rail | Delivers VCC or VBATT (whichever is higher) to RAM; rated for 100 mA continuous load with <0.5 V dropout. |
| GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to system ground plane. |
| RESET | Active-low reset output | Asserts low when VCC < 4.65 V, watchdog timeout occurs, or VCC falls below VBATT; remains valid down to 1 V VCC. |
| WDI | Watchdog input | Three-level input (0.8 V/3.5 V thresholds); each transition resets 1.6 s timer; floating disables watchdog. |
| PFI | Power-fail comparator input | Non-inverting input referenced to 1.3 V; drives PFO low when voltage drops below threshold for early warning. |
| PFO | Power-fail output | Open-drain output that pulls low when PFI < 1.3 V; used to trigger microcontroller NMI or initiate graceful shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 1 V VCC reset operation | Ensures microprocessor remains held in reset even during severe brownout conditions where supply dips below 2 V. |
| Integrated battery switchover with 20 mV hysteresis | Prevents oscillation during slow VCC decay by requiring 70 mV rise or 50 mV fall between VCC and VBATT for state change. |
| 5 ns CE gating propagation delay | Enables precise write-protection timing for high-speed SRAM access cycles without adding external logic latency. |
| 0.6 µA battery standby current | Supports >10-year backup using CR2032 coin cells in metering and data-logging applications with infrequent wake-ups. |
| 1.3 V PFI comparator with <1 µs response | Allows detection of supply droop 5–10 ms before reset threshold breach, enabling safe EEPROM save operations. |
Applications
| Industrial Controller Monitoring | Embedded Data Logger |
|---|---|
Use Scenario: PLC I/O modules operating in factory-floor environments with fluctuating 24 VDC supplies converted to 5 V. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM retention during line faults, and early power-fail interrupt to store process state. Use Value: Prevents corrupted control outputs by holding CPU in reset until 5 V rail stabilizes above 4.65 V, while VOUT sustains 100 mA to retain configuration registers. | Use Scenario: Battery-powered environmental sensor node logging temperature/humidity every 10 seconds with 72-hour backup. IC Role / Device Role / Timing Role: Power supervisor managing LiMnO₂ cell switchover, issuing 50 ms reset pulse on cold start, and triggering shutdown via PFO when main supply fails. Use Value: 0.6 µA backup current extends CR123A cell life to >5 years; 1.6 s watchdog catches firmware hangs during RF transmission bursts. |
| Automotive Body Control Module | Medical Diagnostic Instrument |
Use Scenario: Under-dash BCM subjected to load-dump transients and cold-crank voltage sags to 3.2 V. IC Role / Device Role / Timing Role: Reset generator asserting RESET down to 1 V VCC, enabling fail-safe shutdown and EEPROM write-lock during undervoltage events. Use Value: Maintains deterministic reset behavior across –40°C to +85°C; 40 mV hysteresis prevents chatter during slow battery recharge recovery. | Use Scenario: Portable ultrasound device with volatile acquisition buffer requiring zero-data-loss power interruption handling. IC Role / Device Role / Timing Role: Dual-role supervisor: generating 50 ms reset for ARM core boot and enabling fast VCC→VBATT handover to preserve image frame buffers. Use Value: 100 mA VOUT drive sustains DDR SRAM burst writes during switchover; PFI comparator triggers DMA flush before PFO asserts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690CPA+ | Same 8-pin DIP, 4.65 V reset threshold, but 120 µA quiescent current vs. ADM690ANZ's 1.95 mA active current and 0.6 µA backup current. | Lacks integrated PFI/PFO comparator; requires external circuitry for power-fail warning functionality. | Select MAX690CPA+ only if PFI/PFO is unused and lower active supply current is not required. |
| TPS3823-46DBVR | 3-pin SOT-23, 4.63 V reset threshold, 240 ms reset pulse, no battery switchover or watchdog-pure reset monitor. | No VOUT switching, no VBATT support, no WDI monitoring-suitable only for basic reset-only applications. | Choose TPS3823-46DBVR only for space-constrained designs where battery backup and watchdog are handled externally. |
Compared with MAX690CPA+ and TPS3823-46DBVR, ADM690ANZ uniquely integrates battery switchover, watchdog, and power-fail warning in a single 8-pin DIP-reducing BOM count by three discrete ICs while maintaining industrial temperature range and 1 V reset validity.
Availability
ADM690ANZ is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, automotive body electronics, and medical diagnostic instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM690ANZ 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 ADM690–ADM695 family was engineered specifically for microprocessor system supervision-delivering integrated reset, battery backup, watchdog, and power-fail detection in minimal footprint packages for space- and reliability-critical embedded applications.
FAQ
What is the guaranteed minimum operating VCC for reset assertion in ADM690ANZ?
The ADM690ANZ guarantees RESET assertion down to 1 V VCC, ensuring the microprocessor remains held in reset during severe brownout conditions where supply voltage collapses below 2 V. This specification is validated across the full –40°C to +85°C temperature range and is independent of load current on VOUT. The 1 V guarantee is explicitly stated in the General Description and confirmed in the Absolute Maximum Ratings section of the ADM690–ADM695 datasheet Rev. A.
Does ADM690ANZ support adjustable watchdog timeout periods?
No, ADM690ANZ has a fixed 1.6 s watchdog timeout period and does not support adjustment via OSC SEL, OSC IN, or external components. Only the ADM691/ADM693/ADM695 variants in the same family offer configurable watchdog timing. The ADM690ANZ datasheet clearly states "Nominal Watchdog Timeout Period: 1.6 s" in the Product Selection Guide and confirms fixed operation in the Functional Block Diagram and Watchdog Timer RESET section.
What is the maximum continuous output current ADM690ANZ can deliver at VOUT?
ADM690ANZ delivers up to 100 mA continuously at VOUT with a maximum voltage drop of 0.5 V (VCC – 0.5 V) under full load, as specified in the Battery Backup Switching section of the datasheet. This rating applies during normal VCC-powered operation; in battery backup mode, VOUT is limited to 250 µA at VBATT – 0.02 V. Exceeding 100 mA requires an external PNP transistor driven by BATT ON-which ADM690ANZ lacks, confirming its fixed 100 mA capability.
Can ADM690ANZ be used with a 3.3 V microprocessor system?
No, ADM690ANZ is designed exclusively for 5 V nominal systems, with a 4.65 V reset threshold and VCC operating range of 4.75 V to 5.5 V. Its internal comparators, regulators, and switching transistors are optimized for 5 V operation; applying 3.3 V to VCC will prevent proper reset assertion and disable battery switchover. For 3.3 V systems, Analog Devices recommends the ADM680/ADM681 family or compatible 3.3 V supervisors.
What is the function of the PFI and PFO pins on ADM690ANZ?
The PFI (Power Fail Input) pin connects to a resistor divider monitoring the main 5 V supply, comparing it against an internal 1.3 V reference. When PFI voltage drops below 1.3 V, the PFO (Power Fail Output) pin asserts low-an open-drain signal used to trigger microcontroller interrupts for early shutdown. This allows 5–10 ms of warning before VCC crosses the 4.65 V reset threshold, enabling safe data save operations. Both functions are fully operational in battery backup mode per Table II.
ADM690ANZ 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:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM690ANZ FAQ
1.How can I place an order for ADM690ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM690ANZ 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 ADM690ANZ reliable?
The price and inventory of ADM690ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM690ANZ is usually 5 days.
3.What payment methods are accepted for ADM690ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM690ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM690ANZ?
ADM690ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM690ANZ 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 ADM690ANZ?
For technical support, including ADM690ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM690ANZ requirements.
6.How does Aetrix verify that ADM690ANZ is sourced from the original manufacturer or authorized distributors?
All ADM690ANZ 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 ADM690ANZ meets industry standards.
7.What is the process for return or replacement of ADM690ANZ?
All ADM690ANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM690ANZ, 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 ADM690ANZ part is unused and in its original packaging.
Return procedure for ADM690ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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