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Analog Devices Inc. ADM8690ARNZ
- Part No.:
- ADM8690ARNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM8690ARNZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:113
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Product details
Overview
ADM8690ARNZ from Analog Devices is a microprocessor supervisory circuit providing power-on/brownout reset, battery backup switchover, watchdog timer (fixed 1.6 s timeout), and 1.3 V power-fail detection in an 8-lead SOIC package. It asserts active-low RESET down to VCC = 1 V, delivers up to 100 mA at VOUT with 0.7 Ω on-resistance, and consumes only 0.7 mW typical. It is used in embedded controllers and industrial instrumentation requiring reliable power monitoring and nonvolatile memory retention.
For engineers reviewing the ADM8690ARNZ datasheet, ADM8690ARNZ pinout, ADM8690ARNZ application, or ADM8690ARNZ 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, integrated battery switchover with 70 mV switchover hysteresis, and 1.3 V PFI comparator for early power-fail warning.
Technical Context
The ADM8690ARNZ implements a precision voltage monitor with 4.65 V reset threshold and 40 mV hysteresis, ensuring stable reset behavior during supply transients. Its internal PMOS switch enables seamless VCC-to-VBATT switchover with 0.7 Ω on-resistance in normal mode and 7 Ω in backup mode, supporting up to 100 mA output current while maintaining low dropout.
A dedicated 1.3 V comparator monitors PFI for power-fail warning, and a fixed 1.6 s watchdog timer detects processor lockup via WDI transitions. RESET remains functional down to 1 V VCC, and the device operates across −40°C to +85°C with 0.4 μA standby current in battery backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.13 V - ensures compatibility with 5 V ±5% supplies and prevents false resets during nominal operation. |
| Reset Pulse Width | 50 ms typical - provides sufficient time for microprocessor and peripheral stabilization after power-up or brownout recovery. |
| VCC Operating Range | 4.75 V to 5.5 V - defines valid supply window for primary power monitoring and reset generation. |
| Battery Switchover Hysteresis | 20 mV - prevents oscillation during slow VCC decay by enforcing 70 mV rise and 50 mV fall thresholds. |
| Supply Current | 200 μA typical - enables low-power system design without compromising supervision functionality. |
| RESET Output Low Voltage | 20 mV at 10 μA sink, VCC = 1 V - guarantees logic-level compatibility with CMOS inputs even under deep brownout. |
| Watchdog Timeout | 1.6 s fixed - provides robust stall detection for mid-speed microcontrollers without configuration overhead. |
Pinout & Package
ADM8690ARNZ is housed in an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow body) package, 3.9 mm × 4.9 mm, 1.27 mm pitch, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Backup Battery Input | Accepts 2.0–4.25 V backup source; internally selected over VCC when VCC drops below VBATT − 70 mV. |
| 2 (VOUT) | Switched Output | Delivers VCC or VBATT (whichever higher) to RAM or logic; supports 100 mA load with ≤0.2 V dropout at full current. |
| 3 (VCC) | Main Power Supply Input | 5 V nominal input; monitored for reset assertion, brownout, and switchover control. |
| 4 (GND) | Ground Reference | Common 0 V reference for all analog and digital functions; must be low-impedance for accurate threshold sensing. |
| 5 (PFI) | Power-Fail Input | Noninverting input to 1.3 V comparator; triggers PFO low when voltage falls below 1.3 V, enabling early shutdown sequencing. |
| 6 (PFO) | Power-Fail Output | Active-low open-drain output signaling imminent supply loss; drives interrupt lines or status flags. |
| 7 (WDI) | Watchdog Input | Three-level input (low/high/midsupply); transition required every 1.6 s to prevent RESET assertion; floating disables watchdog. |
| 8 (RESET) | Reset Output | Active-low push-pull output; asserted for 50 ms after VCC recovers above 4.65 V or upon watchdog timeout. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset at 1 V VCC | Enables fail-safe hold-down of microprocessor during deep brownout, preventing undefined state execution. |
| 0.7 Ω VCC-to-VOUT Switch On-Resistance | Minimizes voltage drop under 100 mA load, eliminating need for external pass transistor in most RAM backup applications. |
| Integrated 1.3 V Power-Fail Comparator | Provides deterministic early-warning signal (PFO) before VCC crosses reset threshold, allowing time-critical data save operations. |
| 400 nA Standby Current in Battery Mode | Extends lithium or supercapacitor backup life to years in always-on instrumentation and metering systems. |
| 3 ns CE Gating Delay (not applicable) | Not implemented in ADM8690ARNZ - CEIN/CEOUT pins are absent; this feature is exclusive to ADM8691/ADM8695. |
Applications
| Industrial Programmable Logic Controller (PLC) | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Maintains real-time clock and fault log memory during ignition cycling and battery voltage sag. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM switchover, and power-fail warning. Use Value: Prevents corruption of calibration data and diagnostic history by asserting RESET before VCC drops below 4.65 V and switching to VBATT before VCC falls below VBATT − 70 mV. | Use Scenario: Preserves engine timing maps and emission parameters during cranking when battery voltage dips to 6–8 V. IC Role / Device Role / Timing Role: Power supervisor with 1 V minimum RESET assertion and fast switchover to backup source. Use Value: Ensures microcontroller remains held in reset until stable 5 V rail is restored, while VOUT sustains SRAM with <0.2 V dropout at 50 mA load. |
| Medical Infusion Pump Controller | Telecom Remote Terminal Unit (RTU) |
Use Scenario: Safeguards drug delivery dosage history and safety interlock states during AC power interruption. IC Role / Device Role / Timing Role: Dual-role supervisor: reset generator and battery switchover controller with PFI-triggered early alert. Use Value: PFO activates at 1.3 V PFI input, giving ≥100 ms warning before VCC crosses 4.65 V reset threshold-enough time to store critical therapy parameters. | Use Scenario: Retains configuration and alarm logs during grid outage while powered by backup supercapacitor. IC Role / Device Role / Timing Role: Low-quiescent supervisory IC with 0.4 μA battery-mode current and 2.0–4.25 V VBATT support. Use Value: Extends supercapacitor hold-up time beyond 72 hours at 2.5 V VBATT, enabling unattended failover without recharge circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690ESA+ | 4.65 V reset threshold, 200 ms reset pulse, no integrated battery switchover - requires external diode-OR or MOSFET circuit. | Lacks VOUT/VBATT switching; suitable only where backup is handled externally or not required. | Select when cost sensitivity outweighs integration benefit and battery backup is omitted or implemented discretely. |
| TPS3823-46DBVR | 4.63 V reset threshold, 200 ms reset pulse, no watchdog or battery switchover - pure reset supervisor with manual reset input. | No PFI comparator, no WDI, no VBATT interface - limited to basic reset-only use cases. | Choose for simplified designs needing only precise reset generation without power-fail warning or memory backup control. |
Compared with MAX690ESA+ and TPS3823-46DBVR, ADM8690ARNZ uniquely integrates battery switchover, 1.3 V power-fail detection, and watchdog timer in a single 8-pin SOIC - reducing BOM count, PCB area, and qualification effort for systems requiring full power supervision.
Availability
ADM8690ARNZ is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical infusion pumps, and telecom RTUs requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across temperature.
Supply support for ADM8690ARNZ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM8690ARNZ belongs to the ADM869x supervisory IC family, designed specifically for robust power monitoring and nonvolatile memory protection in mission-critical microprocessor systems operating across extended industrial temperatures.
FAQ
What is the minimum VCC voltage at which ADM8690ARNZ guarantees RESET assertion?
ADM8690ARNZ guarantees active-low RESET assertion down to VCC = 1 V. This ensures the microprocessor remains held in reset during deep brownout conditions where other supervisors may release prematurely. The RESET output remains functional and logic-compatible (≤20 mV low voltage at 10 μA sink) even at this minimum supply, making ADM8690ARNZ suitable for systems with aggressive low-voltage tolerance requirements. This behavior is confirmed in the Absolute Maximum Ratings and General Description sections of the ADM8690/ADM8691/ADM8695 Rev. C datasheet.
Does ADM8690ARNZ support adjustable watchdog timeout periods?
No, ADM8690ARNZ features a fixed 1.6 second watchdog timeout period. Unlike the ADM8691 and ADM8695 variants, it does not include OSC SEL or OSC IN pins for external timing configuration. The watchdog timer is enabled by default and requires a transition on WDI every 1.6 seconds to prevent RESET assertion. If adjustable timeout is required, the ADM8691ARNZ or ADM8695ARNZ should be selected instead. This distinction is explicitly stated in Table 1 (Product Selection Guide) and the Functional Block Diagram section of the ADM8690/ADM8691/ADM8695 datasheet.
What is the maximum continuous output current supported by ADM8690ARNZ at VOUT?
ADM8690ARNZ supports up to 100 mA continuous output current at VOUT with a typical on-resistance of 0.7 Ω in normal (VCC-powered) mode. At 100 mA load, the voltage drop from VCC to VOUT is ≤0.2 V, ensuring adequate headroom for 5 V CMOS RAM. In battery backup mode, the 7 Ω switch limits practical current to ~250 μA for low-power retention, but the device maintains regulation down to VBATT = 2.0 V. These values are specified in Table 2 (Specifications) under "VOUT Output Voltage" and "Battery Backup Switching" sections of the Rev. C datasheet.
Can ADM8690ARNZ be used with a 3.3 V main supply?
No, ADM8690ARNZ is specified only for VCC = 4.75 V to 5.5 V and has a fixed 4.65 V reset threshold. Applying 3.3 V to VCC will cause immediate and permanent RESET assertion, as the supply is below the minimum operating voltage and reset threshold. It is incompatible with 3.3 V systems. For 3.3 V supervision, Analog Devices offers alternatives such as the ADM6315-33 or ADM809 series, which feature matched thresholds and operating ranges. This limitation is defined in Table 2 (Specifications) and Absolute Maximum Ratings of the ADM8690/ADM8691/ADM8695 datasheet.
What is the function of the PFI and PFO pins on ADM8690ARNZ?
The PFI (Power-Fail Input) pin is the noninverting input to a dedicated 1.3 V comparator; when voltage at PFI falls below 1.3 V, the PFO (Power-Fail Output) pin goes low. PFO is an active-low, open-drain output used to trigger microprocessor interrupts for early data save operations before VCC crosses the 4.65 V reset threshold. PFI must be decoupled and referenced to a stable voltage source (e.g., regulated 1.3 V or resistive divider from VCC). This dual-stage warning capability is unique to the ADM869x family and documented in the "Power-Fail Detector" section of the Rev. C datasheet.
ADM8690ARNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM8690ARNZ FAQ
1.How can I place an order for ADM8690ARNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8690ARNZ 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 ADM8690ARNZ reliable?
The price and inventory of ADM8690ARNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8690ARNZ is usually 5 days.
3.What payment methods are accepted for ADM8690ARNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8690ARNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8690ARNZ?
ADM8690ARNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8690ARNZ 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 ADM8690ARNZ?
For technical support, including ADM8690ARNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8690ARNZ requirements.
6.How does Aetrix verify that ADM8690ARNZ is sourced from the original manufacturer or authorized distributors?
All ADM8690ARNZ 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 ADM8690ARNZ meets industry standards.
7.What is the process for return or replacement of ADM8690ARNZ?
All ADM8690ARNZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM8690ARNZ, 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 ADM8690ARNZ part is unused and in its original packaging.
Return procedure for ADM8690ARNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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