My Inquiry
My Account
Analog Devices Inc. ADM692AARNZ-REEL
- Part No.:
- ADM692AARNZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM692AARNZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:357
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADM692AARNZ-REEL from Analog Devices is a precision microprocessor supervisory circuit providing reset generation, watchdog timer, battery switchover, and power-fail detection in a single 8-pin SOIC package. It asserts active-low RESET at 4.40 V threshold with 200 ms timeout, monitors VCC down to 1 V, delivers up to 100 mA on VOUT, and supports automatic VBATT backup switching for CMOS RAM retention during main supply failure.
For engineers reviewing the ADM692AARNZ-REEL datasheet, ADM692AARNZ-REEL pinout, ADM692AARNZ-REEL application, or ADM692AARNZ-REEL equivalent, key selection criteria include its 4.4 V reset threshold, 1.6 s watchdog timeout, ±40 mV reset hysteresis, 100 µA quiescent current, and guaranteed operation across –40°C to +85°C industrial temperature range.
Technical Context
The ADM692AARNZ-REEL integrates four core functions: a precision voltage monitor with 4.40 V reset threshold (±0.15 V tolerance), a monostable watchdog timer triggered by WDI transitions with 1.6 s timeout, an internal PMOS battery switchover switch enabling seamless VCC-to-VBATT handover at 20 mV differential, and a 1.25 V reference-based power-fail comparator accepting external PFI input.
Its reset generator guarantees assertion down to VCC = 1 V, while VOUT maintains regulation within 20 mV of VCC (at 5 mA load) or VBATT (in backup mode). The device operates from VCC = 4.5 V to 5.5 V and supports VBATT = +2.8 V, with battery standby current as low as 0.05 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V nominal; ensures reliable µP reset initiation when +5 V rail drops below safe operating level |
| Reset Timeout Delay | 200 ms typical; provides sufficient stabilization time for microprocessor power-up sequence |
| Watchdog Timeout | 1.6 s nominal; detects software lockup by requiring periodic WDI transitions |
| Supply Current | 100 µA max; enables low-power system monitoring without significant load on main supply |
| Battery Standby Current | 0.05 µA typical; minimizes self-discharge of backup battery during extended hold-up periods |
| VOUT Load Capability | 100 mA in normal mode; supports direct drive of CMOS RAM or low-power logic without external buffer |
| Operating Temperature | –40°C to +85°C; qualified for industrial environments including embedded controllers and instrumentation |
Pinout & Package
ADM692AARNZ-REEL is housed in an 8-lead SOIC (SO-8) package measuring 4.90 mm × 3.90 mm × 1.75 mm, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | +5 V nominal supply; powers internal circuitry and sources VOUT during normal operation |
| VBATT | Backup battery input | Connects to 3 V lithium or capacitor backup; automatically engages when VCC falls 20 mV below VBATT |
| VOUT | Switched output supply | Delivers either VCC or VBATT to RAM/low-power circuitry; supports 100 mA load in normal mode |
| GND | Ground reference | Common return path for all analog and digital functions; required for accurate voltage monitoring |
| PFI | Power fail comparator input | Accepts divided-down supply voltage; triggers PFO when input falls below 1.25 V reference |
| PFO | Power fail output | Active-low open-drain signal indicating impending supply collapse; used for NMI or controlled shutdown |
| RESET | Reset output | Active-low push-pull output asserting for 200 ms after VCC recovery or watchdog timeout |
| WDI | Watchdog input | Three-level input (high/low/floating); resets timer on each transition; floating disables watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset assertion down to VCC = 1 V | Ensures processor remains held in reset during deep brownout, preventing undefined state execution |
| Automatic battery switchover with 20 mV hysteresis | Eliminates spurious switching during VCC decay; enables hot-swap battery replacement without reset glitches |
| 1.25 V precision internal reference for PFI | Enables accurate power-fail detection across temperature; supports custom trip points via resistor divider |
| 100 µA max quiescent current | Reduces system standby power budget impact; suitable for battery-backed applications with multi-year hold-up |
| Industrial temperature qualification (–40°C to +85°C) | Validated for use in harsh environments including factory automation, telecom infrastructure, and test equipment |
Applications
| Embedded Controller Power Monitoring | Industrial PLC Memory Backup |
|---|---|
Use Scenario: Monitoring +5 V supply in programmable logic controller with nonvolatile RAM retention requirement. IC Role / Device Role / Timing Role: Supervisory IC providing reset signaling, battery switchover, and early power-fail warning via PFO interrupt. Use Value: Prevents data corruption during mains interruption by holding µP in reset while seamlessly transferring RAM power to backup source. | Use Scenario: Maintaining SRAM contents in distributed I/O module during transient AC line dropout. IC Role / Device Role / Timing Role: Dual-role supervisor: generates 200 ms RESET pulse on brownout and switches VOUT to VBATT within 20 mV VCC–VBATT differential. Use Value: Guarantees >10-year data retention using 3 V lithium coin cell due to 0.05 µA battery standby current. |
| Medical Instrument Watchdog Protection | Test Equipment Power Sequencing |
Use Scenario: Ensuring fail-safe operation of patient-monitoring microcontroller subject to EMI-induced lockup. IC Role / Device Role / Timing Role: Watchdog timer monitoring dedicated I/O toggle line; asserts RESET if no WDI transition occurs within 1.6 s. Use Value: Recovers system autonomously without operator intervention, meeting IEC 62304 safety requirements for Class B devices. | Use Scenario: Coordinating power-up sequencing between FPGA, ADC, and analog front-end in automated test system. IC Role / Device Role / Timing Role: Reset generator synchronizing multiple subsystems; RESET pulse width (200 ms) exceeds longest power-rail settling time. Use Value: Eliminates race conditions during cold start by enforcing deterministic initialization order across mixed-signal ICs. |
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 ±150 mV reset threshold tolerance vs. ±150 mV for ADM692A; higher 120 µA quiescent current | Lacks guaranteed 1 V reset assertion; not qualified for full –40°C to +85°C range | Acceptable where wider reset tolerance and reduced temperature coverage are acceptable |
| TPS3823-44DBVR | Different pinout; 4.4 V reset threshold with tighter ±0.5% accuracy; no integrated battery switchover or watchdog | Requires external MOSFET and timing circuit for backup and watchdog functions | Preferred when only precision reset is needed and board space allows discrete implementation |
Compared with MAX692AESA+ and TPS3823-44DBVR, the ADM692AARNZ-REEL uniquely combines 4.4 V reset, 1.6 s watchdog, battery switchover, and power-fail detection in one SOIC-8 package with guaranteed 1 V operation-enabling compact, robust supervision without design compromises.
Availability
ADM692AARNZ-REEL is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, test and measurement equipment, and embedded computing platforms requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADM692AARNZ-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 technologies for precision measurement and control.
The ADM69x family was designed specifically for microprocessor system supervision-integrating reset, watchdog, battery backup, and power-fail functions into compact, temperature-qualified packages for industrial and embedded reliability.
FAQ
What is the exact reset voltage threshold for ADM692AARNZ-REEL and how tightly is it specified?
The ADM692AARNZ-REEL 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 specification is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official Analog Devices datasheet REV. 0, ensuring predictable reset behavior across industrial operating conditions. The ADM692AARNZ-REEL does not share the 4.65 V threshold of the ADM690A variant.
Does ADM692AARNZ-REEL support operation with VCC below 4.5 V, and what happens to RESET output at low VCC?
Yes, ADM692AARNZ-REEL guarantees RESET assertion down to VCC = 1.0 V, as explicitly stated in the General Description and confirmed in the Electrical Characteristics table under "RESET Output Voltage" test condition (VCC = 1 V). At VCC = 1.0 V, RESET remains functional with a sink capability of 100 µA and output voltage ≤0.3 V, ensuring the microprocessor stays held in reset during deep brownout events. This behavior is intrinsic to the ADM692AARNZ-REEL's internal architecture and is not dependent on external components.
How does the battery switchover function work in ADM692AARNZ-REEL, and what is the switchover threshold?
The ADM692AARNZ-REEL performs automatic battery switchover using an internal PMOS switch that connects VBATT to VOUT when VCC falls below VBATT by 20 mV during power-down, and reconnects VCC to VOUT when VCC rises 20 mV above VBATT during power-up. This 20 mV differential-specified in the Pin Function Description and confirmed in the "Battery Switchover Threshold" parameter-is fixed and provides hysteresis to prevent oscillation. The ADM692AARNZ-REEL supports VBATT = +2.8 V and delivers VOUT = VBATT – 0.002 V at 250 µA load in backup mode.
Can the watchdog timer in ADM692AARNZ-REEL be disabled, and if so, how?
Yes, the watchdog timer in ADM692AARNZ-REEL can be disabled by leaving the WDI pin floating or connecting it to a high-impedance (three-stated) logic output, as documented in the Pin Function Description and General Description sections. When WDI is un-driven, the internal transition detector remains inactive and no RESET pulses are generated due to watchdog timeout. This method requires no external components and is fully supported by the ADM692AARNZ-REEL's design-no configuration register or strap pin is needed to disable the feature.
What is the purpose of the PFI and PFO pins on ADM692AARNZ-REEL, and what reference voltage do they use?
The PFI (Power Fail Input) and PFO (Power Fail Output) pins on ADM692AARNZ-REEL implement an independent voltage comparator using a precision 1.25 V internal reference. PFI accepts a scaled version of the main supply (e.g., via resistor divider), and when its voltage falls below 1.25 V, PFO asserts low to signal imminent power loss. This 1.25 V reference is explicitly defined in the Functional Block Diagram, Pin Function Description, and Electrical Characteristics table ("PFI Input Threshold"), and enables configurable power-fail detection thresholds across all ADM692AARNZ-REEL operating conditions.
ADM692AARNZ-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:
- Active
- 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
ADM692AARNZ-REEL FAQ
1.How can I place an order for ADM692AARNZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM692AARNZ-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 ADM692AARNZ-REEL reliable?
The price and inventory of ADM692AARNZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM692AARNZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM692AARNZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM692AARNZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM692AARNZ-REEL?
ADM692AARNZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM692AARNZ-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 ADM692AARNZ-REEL?
For technical support, including ADM692AARNZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM692AARNZ-REEL requirements.
6.How does Aetrix verify that ADM692AARNZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM692AARNZ-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 ADM692AARNZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM692AARNZ-REEL?
All ADM692AARNZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM692AARNZ-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 ADM692AARNZ-REEL part is unused and in its original packaging.
Return procedure for ADM692AARNZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM692AARNZ-REEL Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
