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Analog Devices Inc. ADM692AARN
- Part No.:
- ADM692AARN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM692AARN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,988
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Product details
Overview
ADM692AARN from Analog Devices is a precision microprocessor supervisory circuit in SO-8 package, providing 4.40 V reset threshold, 200 ms reset timeout, 1.6 s watchdog timer, and automatic battery switchover for CMOS RAM backup. It asserts active-low RESET down to 1 V VCC and monitors power fail via 1.25 V internal reference at PFI input - used in industrial controllers and embedded systems requiring reliable brownout protection.
For engineers reviewing the ADM692AARN datasheet, ADM692AARN pinout, ADM692AARN application, or ADM692AARN equivalent, key selection considerations include its 4.4 V reset threshold (vs. 4.65 V on ADM690A), SO-8 packaging, battery switchover hysteresis of 40 mV, and compatibility with +5 V systems operating from –40°C to +85°C.
Technical Context
The ADM692AARN integrates four core functions: a precision voltage monitor with 4.40 V ±0.15 V threshold, a 1.6 s watchdog transition detector that resets on WDI inactivity, a 1.25 V reference-based power fail comparator (PFI/PFO), and bidirectional battery switchover with <20 mV switchover threshold and 40 mV hysteresis. All logic outputs are CMOS-compatible with rail-to-rail drive capability.
It operates across VCC = 4.5 V to 5.5 V and supports battery backup with VBATT ≥ 2.8 V. RESET remains functional down to VCC = 1 V, and supply current is 70–100 µA in normal mode and ≤1.0 µA in battery backup - enabling long-term memory retention in low-power embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V (min 4.25 V, max 4.50 V) - ensures reliable reset assertion during 5 V supply brownout before processor instability. |
| Reset Timeout | 200 ms (140–280 ms range) - provides sufficient stabilization time for microprocessor and peripheral power-up sequencing. |
| Watchdog Timeout | 1.6 s (1.0–2.25 s range) - detects software lockup in real-time control loops without false triggering from transient noise. |
| VCC Operating Range | 4.5 V to 5.5 V - compatible with standard +5 V TTL/CMOS logic rails and regulated 5 V supplies. |
| Supply Current | 70–100 µA - enables integration into power-constrained industrial and portable systems without significant load impact. |
| Battery Switchover Threshold | ±20 mV - guarantees clean, glitch-free transition between main supply and backup battery during power loss. |
| PFI Reference Voltage | 1.25 V (±0.025 V) - allows accurate, ratio-based monitoring of non-5 V supplies (e.g., 3.3 V, 12 V) using external resistor dividers. |
Pinout & Package
ADM692AARN is housed in an 8-lead SOIC (SO-8) package measuring 4.90 mm × 3.90 mm × 1.75 mm, with gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFO) | Power Fail Output | Open-drain active-low signal indicating PFI voltage drop below 1.25 V - used to trigger NMI or initiate graceful shutdown. |
| 2 (WDI) | Watchdog Input | Three-level input (high/low/floating); toggling required every ≤1.6 s to prevent reset - enables software liveliness verification. |
| 3 (RESET) | Reset Output | Active-low, push-pull output asserted when VCC < 4.40 V or WDI timeout occurs - directly drives µP reset pin with 3.2 mA sink capability. |
| 4 (VBATT) | Battery Input | Backup supply terminal; sources VOUT when VCC drops below switchover threshold - accepts 2.8–6 V lithium or capacitor-based backup. |
| 5 (VOUT) | Output Supply | Switched output connected to VCC or VBATT depending on supply status - powers CMOS RAM with <1 Ω on-resistance and 100 mA capability. |
| 6 (VCC) | Main Power Input | +5 V nominal supply input; device operates from 4.5–5.5 V and maintains RESET functionality down to 1 V - supports brownout detection. |
| 7 (GND) | Ground Reference | Common return path for all analog and digital functions - must be low-impedance to ensure accurate voltage monitoring and noise immunity. |
| 8 (PFI) | Power Fail Input | Non-inverting input of 1.25 V comparator; monitors external supply via resistor divider - enables customizable power-fail warning thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40 V Reset Threshold | Tight ±0.15 V tolerance ensures deterministic reset timing across temperature (–40°C to +85°C) and supply variation. |
| 1.6 s Watchdog Timer with Transition Detection | Resets only on WDI inactivity - immune to static DC levels and compatible with GPIO toggle or clock-driven monitoring schemes. |
| Automatic Battery Switchover with 40 mV Hysteresis | Prevents oscillation during marginal VCC/VBATT transitions and extends backup runtime by minimizing switching losses. |
| 1.25 V Internal Reference for PFI Monitoring | Enables accurate, temperature-stable power-fail detection for any supply rail using two external resistors - no external reference needed. |
| RESET Assertion Down to 1 V VCC | Maintains system reset integrity through deep brownout, preventing undefined processor states during catastrophic supply collapse. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Continuous operation in factory-floor automation where mains power interruptions cause transient brownouts. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and watchdog supervision for ARM Cortex-M based controller. Use Value: Prevents firmware corruption during unstable 24 VDC supply dips by asserting RESET until VCC stabilizes above 4.40 V for 200 ms. |
Use Scenario: Portable ultrasound units requiring persistent RAM state during battery swaps or AC adapter disconnection. IC Role / Device Role / Timing Role: Battery switchover manager and system reset supervisor ensuring zero-interruption memory retention. Use Value: Seamlessly transfers VOUT from VCC to VBATT within 20 mV window, sustaining SRAM power without data loss during hot-swap events. |
| Telecom Base Station Management | Automotive Infotainment Gateways |
Use Scenario: Remote telecom node powered by PoE with backup supercapacitor, subject to intermittent link loss. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 5 V PoE rail via PFI and triggers orderly shutdown via PFO before capacitor depletion. Use Value: Uses 1.25 V internal reference to set precise 4.2 V power-fail threshold - avoids premature shutdown while ensuring safe write-to-flash sequence. |
Use Scenario: Head unit boot sequence requiring deterministic reset timing after vehicle ignition cycle and ECU wake-up signals. IC Role / Device Role / Timing Role: Primary reset generator synchronized to 5 V domain power-up, with watchdog guarding bootloader execution. Use Value: Guarantees 200 ms RESET pulse aligned to power rail stabilization, eliminating race conditions between SoC initialization and peripheral configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Pin-compatible but uses ±1.5% reset threshold (4.40 V ±0.066 V); higher 120 µA quiescent current; no guaranteed 1 V RESET operation. | Lacks 1 V RESET assertion and tighter 40 mV battery switchover hysteresis - less robust in deep brownout scenarios. | Select MAX692AESA+ only if legacy MAXIM footprint reuse is mandatory and 1 V operation is not required. |
| TPS3823-44DBVR | Fixed 4.40 V threshold, but no battery switchover or PFI/PFO functions; watchdog disabled by default; 16 µA typical supply current. | Single-function reset IC - requires external circuitry for battery backup and power-fail warning, increasing BOM count and board area. | Choose TPS3823-44DBVR only when battery switchover and power-fail monitoring are handled elsewhere in the design. |
Compared with MAX692AESA+ and TPS3823-44DBVR, the ADM692AARN uniquely integrates reset, watchdog, battery switchover, and power-fail detection in one SO-8 package - reducing component count, PCB space, and qualification effort for full-featured supervisory needs.
Availability
ADM692AARN is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom base station management, and automotive infotainment gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM692AARN 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, communications, and automotive markets since 1965.
The ADM692AARN belongs to Analog Devices' microprocessor supervisory circuit product line, designed specifically to replace discrete reset + watchdog + battery switchover solutions in space- and reliability-critical embedded systems.
FAQ
What is the exact reset voltage threshold for ADM692AARN?
The ADM692AARN has a nominal reset voltage threshold of 4.40 V, with guaranteed minimum and maximum values of 4.25 V and 4.50 V respectively over the full –40°C to +85°C temperature range. This threshold is factory-trimmed and specified under VCC falling conditions, ensuring consistent brownout detection behavior across operating conditions.
Does ADM692AARN support battery backup for CMOS RAM?
Yes, ADM692AARN provides fully integrated automatic battery switchover: when VCC falls below the reset threshold and drops 20 mV below VBATT, VOUT switches from VCC to VBATT. The internal PMOS switch delivers up to 100 mA with <1 Ω on-resistance, and supply current in backup mode is ≤1.0 µA - ideal for long-term SRAM retention.
Can ADM692AARN monitor non-5 V power supplies?
Yes, ADM692AARN can monitor any supply rail using its PFI input and internal 1.25 V reference. By connecting a resistor divider from the target supply to PFI, users set custom power-fail thresholds - for example, a 12 V rail can be monitored for 11.4 V failure using R1/R2 = 8.12 per VT = (1.25 × R1/R2) + 1.25 V.
What happens to RESET output when VCC drops below 1 V?
The ADM692AARN guarantees RESET assertion down to VCC = 1 V - meaning the output remains actively low even as the main supply collapses. Below 1 V, the device ceases operation and RESET enters high-impedance state; however, this 1 V guarantee ensures full microprocessor hold-down during worst-case brownout transients before complete power loss.
Is ADM692AARN pin-compatible with other devices in its family?
Yes, ADM692AARN shares identical SO-8 pinout and function mapping with ADM690AARN, ADM802MARN, and ADM805MARN - enabling direct substitution where 4.40 V reset threshold and active-low RESET are required. Differences are limited to reset threshold value and RESET polarity (ADM805x variants provide active-high RESET).
ADM692AARN 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM692AARN FAQ
1.How can I place an order for ADM692AARN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM692AARN 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 ADM692AARN reliable?
The price and inventory of ADM692AARN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM692AARN is usually 5 days.
3.What payment methods are accepted for ADM692AARN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM692AARN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM692AARN?
ADM692AARN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM692AARN 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 ADM692AARN?
For technical support, including ADM692AARN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM692AARN requirements.
6.How does Aetrix verify that ADM692AARN is sourced from the original manufacturer or authorized distributors?
All ADM692AARN 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 ADM692AARN meets industry standards.
7.What is the process for return or replacement of ADM692AARN?
All ADM692AARN units undergo pre-shipment inspection (PSI). If there is an issue with ADM692AARN, 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 ADM692AARN part is unused and in its original packaging.
Return procedure for ADM692AARN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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