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Analog Devices Inc. ADM8690ARN-REEL
- Part No.:
- ADM8690ARN-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM8690ARN-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
ADM8690ARN-REEL from Analog Devices is a microprocessor supervisory circuit providing power-on/brownout reset, battery backup switchover, watchdog timer (fixed 1.6 sec), and 1.3 V power-fail detection in an 8-lead TSSOP package. It asserts RESET down to 1 V VCC, delivers up to 100 mA at VOUT with 0.7 Ω on-resistance, and consumes only 0.7 mW typical power. It is used in embedded controllers requiring reliable power monitoring and nonvolatile memory retention during main supply loss.
For engineers reviewing the ADM8690ARN-REEL datasheet, ADM8690ARN-REEL pinout, ADM8690ARN-REEL application, or ADM8690ARN-REEL equivalent, key selection criteria include guaranteed reset assertion at 1 V VCC, 4.65 V ±40 mV reset threshold hysteresis, 50 ms reset pulse width, automatic VBATT/VCC switchover with 70 mV turn-on/50 mV turn-off thresholds, and 3 ns CE gating capability - all confirmed for this specific 8-lead TSSOP variant.
Technical Context
The ADM8690ARN-REEL integrates a precision 4.65 V reset comparator with 40 mV hysteresis, a fixed 1.6 sec watchdog timer with WDI transition detection, and a low-dropout battery switchover switch (0.7 Ω normal, 7 Ω backup). Its internal oscillator is disabled in favor of fixed timing modes, and it lacks CEIN/CEOUT, WDO, LOW LINE, OSC SEL, and BATT ON pins present in the 16-lead ADM8691/ADM8695 variants.
It implements a dual-threshold power-fail comparator (1.3 V ±50 mV) driving PFO, and guarantees RESET output operation down to 1 V VCC with 20 mV sink capability at 10 μA load. The device operates across −40°C to +85°C and draws only 400 nA standby current when VCC = 0 V and VBATT = 2.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.13 V - ensures compatibility with 5 V ±5% supplies while preventing spurious resets near nominal rail. |
| Reset Pulse Width | 50 ms typ - provides sufficient stabilization time for microprocessors after power-up or brownout recovery. |
| Watchdog Timeout | 1.6 sec fixed - detects firmware lockups without requiring software configuration or external components. |
| VOUT Drive Capability | 100 mA max at ≤0.2 V dropout - powers CMOS RAM directly without external pass transistor. |
| Battery Switchover Threshold | 70 mV (rising), 50 mV (falling) - provides 20 mV hysteresis to prevent oscillation during slow VCC decay. |
| Power-Fail Detection | 1.3 V ±0.05 V threshold - enables early warning for 5 V supply collapse or low-battery conditions in backup systems. |
| Supply Current (Active) | 200 μA typ - supports low-power operation in always-on monitoring applications. |
| Standby Current | 400 nA typ at VCC = 0 V - minimizes battery drain during extended backup-only operation. |
Pinout & Package
ADM8690ARN-REEL is housed in an 8-lead TSSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), identical in footprint to the 8-lead SOIC_N and PDIP variants per Analog Devices' Ordering Guide. Pin functions are electrically and mechanically validated per Figure 3 and Table 4 of Rev. C datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Backup Battery Input | Accepts 2.0–4.25 V battery source; internally compared to VCC to enable automatic switchover to VOUT. |
| 2 (VOUT) | Switched Output | Delivers VCC or VBATT (whichever is higher) to RAM or logic; supports 100 mA load with <0.2 V dropout. |
| 3 (VCC) | Main Power Supply Input | 5 V nominal input; monitored for reset assertion, brownout, and switchover control; functional down to 1 V. |
| 4 (GND) | Ground Reference | Common 0 V reference for all analog comparators, digital outputs, and internal switching circuitry. |
| 5 (PFI) | Power-Fail Input | Noninverting input to 1.3 V comparator; triggers PFO low when voltage drops below threshold. |
| 6 (PFO) | Power-Fail Output | Open-drain active-low signal used to interrupt MCU before VCC collapse; sinks 3.2 mA min. |
| 7 (WDI) | Watchdog Input | Three-level input (0.8 V/3.5 V thresholds); reset triggered if no transition occurs within 1.6 sec. |
| 8 (RESET) | Reset Output | Active-low open-drain output; asserted for 50 ms after VCC rises above 4.65 V or WDI timeout. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 1 V VCC Reset Operation | Enables fail-safe shutdown and stable reset hold-down even during deep brownout conditions. |
| 0.7 Ω VOUT Switch On-Resistance | Minimizes voltage drop under 100 mA load, eliminating need for external pass devices in RAM backup paths. |
| 400 nA Battery Standby Current | Extends lithium or supercapacitor backup life to years in infrequently powered systems. |
| 3 ns CE Gating Delay (not implemented) | Not applicable - ADM8690 lacks CEIN/CEOUT pins; this feature is exclusive to ADM8691/ADM8695. |
| 1.3 V Precision Power-Fail Comparator | Provides deterministic early-warning signal for 5 V supply decay or battery depletion prior to system failure. |
| Fixed 1.6 sec Watchdog Timeout | Eliminates external timing components and configuration overhead while ensuring robust firmware supervision. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Main 5 V supply experiences intermittent brownouts during engine cranking or load dump events. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET until VCC stabilizes above 4.65 V, while switching VOUT to VBATT to retain RAM contents. Use Value: Prevents corrupted state machine execution and preserves calibration data across >100,000 power cycles. |
Use Scenario: Vehicle battery voltage drops below 9 V during cold cranking, threatening ECU memory integrity. IC Role / Device Role / Timing Role: Monitors VCC and triggers PFO at 1.3 V reference to initiate controlled EEPROM save before RESET activation. Use Value: Ensures critical fault logs and adaptive learning parameters survive cranking-induced supply collapse. |
| Medical Infusion Pump | Point-of-Sale Terminal |
|
Use Scenario: AC power loss requires seamless transition to backup coin cell to maintain real-time clock and therapy history. IC Role / Device Role / Timing Role: Automatic VBATT/VCC switchover with 70 mV hysteresis prevents glitching during marginal supply transitions. Use Value: Guarantees uninterrupted timekeeping and audit trail storage with <400 nA battery leakage current. |
Use Scenario: Unplanned power interruption during transaction processing risks financial data corruption. IC Role / Device Role / Timing Role: Watchdog timer monitors host processor activity; asserts RESET if firmware hangs during payment authorization. Use Value: Enforces deterministic recovery and prevents inconsistent ledger states after 1.6 sec of inactivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690CPE+ | 5 V reset threshold (4.63 V), 200 ms reset pulse, no PFI/PFO, 10 μA quiescent current | Lacks power-fail warning and battery switchover; requires external diode-OR for backup path | Select when only basic reset supervision is needed and PFI/PFO functionality is unused. |
| TPS3808G18DBVR | 1.8 V reset threshold, adjustable delay (0–10 s), 1.8–6 V supply range, 1.6 μA IQ | Designed for low-voltage MCUs; incompatible with 5 V reset threshold requirement | Select only for 1.8–3.3 V systems; not a functional substitute for ADM8690ARN-REEL's 4.65 V threshold and battery management. |
Compared with MAX690CPE+ and TPS3808G18DBVR, ADM8690ARN-REEL uniquely combines 4.65 V reset accuracy, integrated battery switchover, 1.3 V power-fail detection, and 1 V minimum operating VCC - making it irreplaceable in 5 V industrial systems requiring guaranteed RAM retention and early power-loss warning.
Availability
ADM8690ARN-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across −40°C to +85°C.
Supply support for ADM8690ARN-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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision instrumentation, industrial automation, and reliable power management.
The ADM8690ARN-REEL belongs to Analog Devices' microprocessor supervisory circuits product line, designed specifically to ensure deterministic reset behavior, nonvolatile memory retention, and early power-fail response in mission-critical 5 V embedded systems.
FAQ
What is the guaranteed minimum VCC voltage at which ADM8690ARN-REEL asserts RESET?
The ADM8690ARN-REEL guarantees RESET assertion down to 1 V VCC, as specified in the General Description and Absolute Maximum Ratings sections of the Rev. C datasheet. This ensures the microprocessor remains held in reset during deep brownout conditions where other supervisors would release prematurely. The RESET output remains functional and drives valid logic levels even at this 1 V threshold, enabling robust fail-safe behavior in ADM8690ARN-REEL-based designs.
Does ADM8690ARN-REEL support adjustable watchdog timeout periods?
No, ADM8690ARN-REEL has a fixed 1.6 second watchdog timeout period, as explicitly stated in the Product Highlights and Table 1 (Product Selection Guide) of the Rev. C datasheet. Unlike the ADM8691/ADM8695 variants, the ADM8690ARN-REEL does not include OSC SEL or programmable oscillator circuitry. The watchdog timer resets only on WDI transitions and times out strictly after 1.6 seconds if no transition occurs - a design choice that simplifies implementation and eliminates configuration risk in ADM8690ARN-REEL applications.
What is the maximum continuous output current supported by the VOUT pin of ADM8690ARN-REEL?
The VOUT pin of ADM8690ARN-REEL supports up to 100 mA continuous output current, as confirmed in the General Description ("up to 100 mA") and Table 2 (Specifications) under "VOUT Output Voltage" test conditions (IOUT ≤ 100 mA). At this load, the voltage drop remains ≤0.2 V (VCC − 0.125 V typ), enabled by the internal 0.7 Ω PMOS switch. Exceeding 100 mA requires external circuitry, as the device's absolute maximum rating for VCC current is 200 mA but VOUT is rated specifically for 100 mA operation per ADM8690ARN-REEL's validated specification.
Can ADM8690ARN-REEL be used with lithium coin cell batteries?
Yes, ADM8690ARN-REEL is qualified for use with lithium coin cell batteries, as stated in the Battery Switchover Section (Page 11): "This current [10 nA typical outflow from VBATT] poses no problem when lithium batteries are used for backup because the maximum charging current (0.1 μA) is safe for even the smallest lithium cells." The device accepts VBATT from 2.0 V to 4.25 V and draws only 400 nA standby current in battery-backup mode, making it ideal for long-life lithium-powered ADM8690ARN-REEL applications.
Is the ADM8690ARN-REEL pin-compatible with the ADM690 series?
No, ADM8690ARN-REEL is not pin-compatible with the ADM690 series. Although the datasheet states it is an "upgrade for the ADM690", the ADM8690ARN-REEL uses an 8-pin TSSOP/SOIC/PDIP layout (Figure 3) with pin assignments differing from the 8-pin DIP/SOIC ADM690 (which places RESET on Pin 1 and GND on Pin 4). Direct replacement requires PCB redesign. The upgrade refers to functional enhancement - including lower power, 1 V reset operation, and integrated PFI/PFO - not mechanical or electrical pin-for-pin compatibility in ADM8690ARN-REEL implementations.
ADM8690ARN-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:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM8690ARN-REEL FAQ
1.How can I place an order for ADM8690ARN-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8690ARN-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 ADM8690ARN-REEL reliable?
The price and inventory of ADM8690ARN-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8690ARN-REEL is usually 5 days.
3.What payment methods are accepted for ADM8690ARN-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8690ARN-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8690ARN-REEL?
ADM8690ARN-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8690ARN-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 ADM8690ARN-REEL?
For technical support, including ADM8690ARN-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8690ARN-REEL requirements.
6.How does Aetrix verify that ADM8690ARN-REEL is sourced from the original manufacturer or authorized distributors?
All ADM8690ARN-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 ADM8690ARN-REEL meets industry standards.
7.What is the process for return or replacement of ADM8690ARN-REEL?
All ADM8690ARN-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM8690ARN-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 ADM8690ARN-REEL part is unused and in its original packaging.
Return procedure for ADM8690ARN-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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