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Analog Devices Inc. ADM8692ARN
- Part No.:
- ADM8692ARN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM8692ARN.pdf
- Description:
- IC SUPERVISOR MPU 4.40V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,112
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Product details
Overview
ADM8692ARN from Analog Devices is a microprocessor supervisory circuit providing power-on/brownout reset, battery backup switchover, watchdog timer, and power-fail detection in 5 V systems. It asserts active-low RESET down to VCC = 1 V, delivers up to 100 mA at VOUT with 0.7 Ω on-resistance, and features a 1.6 sec fixed watchdog timeout. It is used in industrial controllers and embedded systems requiring reliable power sequencing and data retention during supply interruption.
For engineers reviewing the ADM8692ARN datasheet, ADM8692ARN pinout, ADM8692ARN application, or ADM8692ARN equivalent, key selection considerations include its guaranteed 4.65 V ±40 mV reset threshold, 50 ms reset pulse width, 0.7 mW typical power consumption, 400 nA standby current, and TSSOP-16 package compatibility with legacy ADM8691/ADM8695 designs.
Technical Context
The ADM8692ARN implements a precision bandgap-based voltage monitor for 4.65 V reset assertion with 40 mV hysteresis, ensuring stable reset release across temperature. Its internal PMOS battery switchover switch operates with 70 mV switchover threshold and 20 mV hysteresis, enabling seamless transition between VCC and VBATT without oscillation.
A dedicated 1.6 sec watchdog timer monitors WDI transitions; if un-toggled beyond timeout, it triggers a 50 ms RESET pulse. The device integrates a 1.3 V power-fail comparator (PFI/PFO) and supports direct CE gating with 3 ns propagation delay-critical for protecting CMOS RAM during brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.13 V - guarantees reliable reset assertion for 5 V ±5% supplies. |
| Reset Pulse Width | 50 ms typ - provides sufficient stabilization time for microprocessors post-power-up. |
| Watchdog Timeout | 1.6 sec fixed - detects firmware hangs without requiring external timing 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) - ensures clean, hysteresis-stabilized VCC/VBATT handoff. |
| Supply Current | 0.7 mW typ at 5 V - enables low-power operation in always-on monitoring applications. |
| Standby Current | 400 nA - minimizes battery drain during extended backup mode. |
Pinout & Package
ADM8692ARN is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), compatible with surface-mount assembly and reflow processes. Pin assignments match the ADM8691/ADM8695 family per Figure 4 of Rev. C datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBATT (Pin 1) | Backup Battery Input | Accepts 2.0–4.25 V battery; internally selected over VCC when VCC drops below VBATT − 70 mV. |
| VOUT (Pin 2) | Switched Output | Delivers VCC or VBATT (whichever higher) to RAM; supports 100 mA load with <0.2 V dropout. |
| VCC (Pin 3) | Main Supply Input | 5 V nominal input; powers internal circuitry and serves as primary source for VOUT. |
| GND (Pin 4) | Ground Reference | Common 0 V reference for all analog and digital functions; must be low-impedance. |
| PFI (Pin 9) | Power-Fail Input | Non-inverting comparator input; triggers PFO low when voltage falls below 1.3 V. |
| PFO (Pin 10) | Power-Fail Output | Active-low open-drain output signaling imminent supply loss; used for early data save. |
| WDI (Pin 11) | Watchdog Input | Three-level input (high/mid/low); reset triggered if no transition occurs within 1.6 sec. |
| RESET (Pin 15) | Reset Output | Active-low CMOS output; held low for 50 ms after VCC rises above 4.65 V or WDI timeout. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power supervision | 0.7 mW typical supply power enables use in energy-constrained embedded systems. |
| Sub-1 V reset operation | RESET remains functional down to VCC = 1 V - ensures controlled shutdown even during deep brownout. |
| Integrated battery switchover | Automatic, hysteresis-stabilized switching between VCC and VBATT eliminates need for external diodes or MOSFETs. |
| Fast CE gating | 3 ns propagation delay on CEIN→CEOUT path prevents spurious writes to RAM during supply transients. |
| Dedicated power-fail warning | 1.3 V PFI threshold with <1 µs response time allows >100 µs advance warning before VCC collapse. |
Applications
| Industrial PLC Controller | Medical Data Logger |
|---|---|
|
Use Scenario: Maintains real-time clock and configuration memory during AC mains interruption or brownout events lasting seconds to minutes. IC Role / Device Role / Timing Role: Supervisory IC providing reset hold, battery-backed RAM power, and early power-fail interrupt via PFO. Use Value: Prevents data corruption by disabling writes during unstable VCC and enabling safe shutdown within 100 µs of PFI alert. |
Use Scenario: Preserves patient vital sign history in battery-backed SRAM when main power fails unexpectedly. IC Role / Device Role / Timing Role: Dual-role device: (1) generates 50 ms RESET pulse to halt CPU during brownout; (2) gates CE line to freeze memory access until VCC stabilizes. Use Value: Guarantees RAM write protection with 3 ns CEOUT response - faster than most microcontroller I/O toggle rates. |
| Automotive Telematics Unit | Point-of-Sale Terminal |
|
Use Scenario: Secures GPS position buffer and CAN message queue during vehicle ignition cycling or alternator voltage sag. IC Role / Device Role / Timing Role: Watchdog supervisor detecting firmware lockup and initiating controlled reboot; also manages backup power to volatile memory. Use Value: 1.6 sec watchdog timeout aligns with automotive boot sequence timing; 400 nA standby current extends coin-cell life to >10 years. |
Use Scenario: Protects transaction logs and encryption keys stored in CMOS RAM during brief AC outage or battery swap. IC Role / Device Role / Timing Role: Voltage monitor asserting RESET at 4.65 V and enabling automatic switchover to backup battery before VCC drops below 4.5 V. Use Value: 0.7 Ω VOUT switch resistance limits voltage drop to <70 mV at 100 mA - preserving RAM data integrity under full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8691ARN | Same 16-pin TSSOP package, identical pinout, but offers adjustable reset timeout (50 ms/ADJ) and dual watchdog periods (100 ms/1.6 sec). | Requires software configuration of OSC SEL/OSC IN pins; not drop-in for fixed-timing designs. | Select ADM8691ARN only if design requires programmable watchdog or reset timing flexibility. |
| MAX691CPD+ | 8-pin PDIP/SOIC package; lacks CE gating, PFO, and battery switchover; reset threshold 4.65 V, 200 ms pulse width. | Cannot support RAM write protection or power-fail warning; limited to basic reset-only applications. | Choose MAX691CPD+ only for space-constrained, cost-sensitive designs where advanced features are unused. |
Compared with ADM8692ARN, ADM8691ARN adds configurability at the cost of timing determinism, while MAX691CPD+ reduces feature set and package footprint but forfeits battery management and early warning capability - making ADM8692ARN optimal for integrated, battery-backed microcontroller systems requiring fixed, proven timing behavior.
Availability
ADM8692ARN is available at Aetrix Electronics and suitable for industrial controllers, medical data loggers, automotive telematics units, and point-of-sale terminals requiring stable component supply with long-term lifecycle assurance.
Supply support for ADM8692ARN 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 ADM869x family was designed specifically for robust microprocessor supervision in harsh environments - integrating reset, watchdog, battery switchover, and power-fail detection into a single IC to reduce system complexity and improve reliability.
FAQ
What is the reset voltage threshold tolerance for ADM8692ARN?
The ADM8692ARN has a nominal reset voltage threshold of 4.65 V, with a guaranteed range of 4.50 V to 4.73 V across temperature and supply conditions. This ±0.13 V tolerance ensures compatibility with standard 5 V ±5% power supplies and provides 40 mV of built-in hysteresis to prevent chatter during slow VCC transitions. The specification is fully characterized per Table 2 in the Rev. C datasheet.
Does ADM8692ARN support battery backup for CMOS RAM?
Yes, ADM8692ARN supports automatic battery backup switching for CMOS RAM. When VCC drops below VBATT minus 70 mV, it seamlessly connects VBATT to VOUT with 7 Ω on-resistance, sustaining RAM operation down to 2.0 V battery voltage. The device draws only 400 nA in battery-backup mode, enabling multi-year coin-cell life. VOUT delivers up to 100 mA with <0.2 V dropout at full load.
Can ADM8692ARN be used with a 3.3 V microprocessor system?
No, ADM8692ARN is specified exclusively for 5 V nominal systems. Its reset threshold is fixed at 4.65 V, and VCC operating range is 4.75 V to 5.5 V. It does not support 3.3 V logic levels or supervision. For 3.3 V systems, consider Analog Devices' ADM6315 or ADM809 families, which offer matching functionality with 3.08 V or 3.06 V thresholds and compatible TSSOP packaging.
What is the function of the PFI and PFO pins on ADM8692ARN?
The PFI (Pin 9) is a 1.3 V precision comparator input used to monitor auxiliary voltages - such as a secondary rail or battery level - and assert PFO (Pin 10) low when PFI falls below threshold. PFO is an open-drain output that can trigger MCU interrupts for early data save. Response time is <1 µs, and input bias current is ±0.01 nA, enabling high-impedance sensing without loading external circuits.
Is ADM8692ARN pin-compatible with ADM8691ARN?
Yes, ADM8692ARN is fully pin-compatible with ADM8691ARN in the 16-lead TSSOP package. Both share identical pin numbering, electrical characteristics, and functional block diagram (Figure 2). However, ADM8692ARN fixes the reset timeout at 50 ms and watchdog at 1.6 sec, whereas ADM8691ARN supports adjustable timing via OSC SEL/OSC IN - so firmware and external component choices must match the selected variant.
ADM8692ARN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM8692ARN FAQ
1.How can I place an order for ADM8692ARN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8692ARN 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 ADM8692ARN reliable?
The price and inventory of ADM8692ARN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8692ARN is usually 5 days.
3.What payment methods are accepted for ADM8692ARN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8692ARN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8692ARN?
ADM8692ARN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8692ARN 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 ADM8692ARN?
For technical support, including ADM8692ARN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8692ARN requirements.
6.How does Aetrix verify that ADM8692ARN is sourced from the original manufacturer or authorized distributors?
All ADM8692ARN 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 ADM8692ARN meets industry standards.
7.What is the process for return or replacement of ADM8692ARN?
All ADM8692ARN units undergo pre-shipment inspection (PSI). If there is an issue with ADM8692ARN, 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 ADM8692ARN part is unused and in its original packaging.
Return procedure for ADM8692ARN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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