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Analog Devices Inc./Maxim Integrated MAX692AESA
- Part No.:
- MAX692AESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX692AESA.pdf
- Description:
- IC SUPERVISOR MAX692 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,522
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Product details
Overview
The MAX692AESA from Maxim Integrated is a microprocessor supervisory circuit providing precision reset generation, battery-backup switchover, watchdog timer, and power-fail detection in a single 8-pin SO package. It asserts an active-low RESET output during power-up (VCC ≥ 1V), brownout (VCC < 4.40V), and watchdog timeout (1.6s), while switching VOUT to VBATT when VCC drops below threshold-enabling reliable CMOS RAM retention in industrial controllers and battery-powered instrumentation.
For engineers reviewing the MAX692AESA datasheet, MAX692AESA pinout, MAX692AESA application, or MAX692AESA equivalent, this device delivers guaranteed RESET assertion down to VCC = 1.2V, ±2% power-fail accuracy, 200ms reset pulse width, and low-quiescent-current battery-backup mode (50nA) - critical for embedded systems requiring deterministic power monitoring and fail-safe state recovery.
Technical Context
The MAX692AESA integrates four independent functional blocks: a precision voltage monitor with 4.40V reset threshold (±2% over temperature), a 1.6s watchdog timer cleared by WDI edge transitions, a 1.25V reference-based power-fail comparator (PFI/PFO), and a dual-path power switch routing VCC or VBATT to VOUT based on voltage comparison and hysteresis (40mV). All logic operates from either VCC or VBATT, enabling seamless backup activation without external control.
Its internal architecture guarantees RESET remains asserted until VCC rises 200ms above 4.40V, prevents chatter during slow VCC ramp-down via 40mV hysteresis, and disables the watchdog if WDI floats or is three-stated-ensuring robust operation in noisy or intermittently serviced μP environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V nominal, ±2% accuracy over -40°C to +85°C - ensures consistent brownout detection across industrial temperature range |
| Reset Pulse Width | 200ms minimum - provides sufficient hold time for μP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s nominal - balances fault detection responsiveness with software servicing overhead |
| Quiescent Current (VCC active) | 200µA typical - minimizes main supply loading in always-on monitoring applications |
| Quiescent Current (VBATT only) | 50nA typical - extends lithium battery life beyond 10 years in backup mode |
| VOUT Switch Resistance | 5Ω (VCC path), 80Ω (VBATT path) - limits voltage drop under 5mA RAM load to <25mV and <4mV respectively |
| Power-Fail Comparator Accuracy | ±2% at VCC = 5V - enables precise early-warning detection of +5V regulator dropout |
Pinout & Package
MAX692AESA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm wide, with standard 1.27mm pitch and RoHS-compliant lead-free finish (S8+2 outline).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (5Ω path) and VBATT (80Ω path) based on reset threshold crossing with 40mV hysteresis |
| 2 - VCC | +5V main supply input | Primary power source; must be ≥1.2V for guaranteed RESET assertion; powers all internal circuitry unless VBATT takes over |
| 3 - GND | Ground reference | Common return for VCC, VBATT, PFI, WDI, RESET, PFO; substrate connection point |
| 4 - PFI | Power-fail comparator input | Compares external voltage divider output to internal 1.25V reference; triggers PFO low when input <1.25V |
| 5 - PFO | Power-fail open-drain output | Active-low signal indicating PFI undervoltage; sinks 3.2mA max; requires external pull-up |
| 6 - WDI | Watchdog timer input | Edge-sensitive; resets 1.6s timer on rising/falling transition; floating or high-impedance disables watchdog |
| 7 - RESET | Active-low reset output | Push-pull output asserting low for 200ms after VCC rise or brownout; guaranteed valid down to VCC = 1.2V |
| 8 - VBATT | Backup battery input | Supplies VOUT when VCC < reset threshold and VBATT > VCC +20mV; draws <1µA when VCC < VBATT −1V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1.2V | Ensures reliable μP reset initiation even during severe brownout conditions before full supply collapse |
| 40mV reset threshold hysteresis | Prevents oscillatory RESET toggling during slow VCC ramp-down or noise-induced threshold crossings |
| 50nA battery-backup quiescent current | Enables multi-year operation on standard 3.6V lithium coin cells without replacement |
| Independent power-fail comparator | Operates separately from reset logic - allows concurrent monitoring of secondary supplies (e.g., +3.3V, -5V) via resistor dividers |
| VBATT-to-VOUT switchover with 80Ω switch | Minimizes voltage droop under light RAM loads while isolating battery from main supply leakage paths |
Applications
| Battery-Powered Controllers | Industrial Process Monitors |
|---|---|
Use Scenario: Remote PLC I/O modules powered by primary DC supply with lithium backup battery. IC Role / Device Role / Timing Role: Supervisory IC providing brownout-triggered RESET, automatic RAM backup switchover, and watchdog supervision of firmware execution. Use Value: Prevents data corruption during grid fluctuations and maintains real-time clock/calendar state for >10 years on backup power. |
Use Scenario: Embedded sensor nodes in factory automation measuring temperature, pressure, and flow with local data logging. IC Role / Device Role / Timing Role: Power integrity monitor asserting RESET before supply collapse and signaling impending failure via PFO to initiate safe shutdown. Use Value: Enables graceful firmware save-to-EEPROM and hardware state freeze prior to loss of regulated +5V rail. |
| Critical μP Power Monitoring | Intelligent Instrumentation |
Use Scenario: Medical diagnostic equipment requiring deterministic boot sequence and fail-safe memory retention. IC Role / Device Role / Timing Role: Primary reset generator with 200ms pulse width and 4.40V threshold aligned to +5V ±10% supply tolerance. Use Value: Guarantees μP enters known state before peripherals initialize, eliminating race conditions in safety-critical startup. |
Use Scenario: Handheld multimeters and oscilloscopes with nonvolatile configuration storage and real-time clock. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET generator during power transitions and low-battery detector via PFI monitoring of 3.6V Li-cell. Use Value: Alerts user of imminent battery depletion while preserving calibration data and measurement history in SRAM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MESA | Identical electrical specs, same 4.40V reset threshold and 200ms pulse width; differs only in ordering code (no functional difference) | No application difference - pin-compatible, functionally identical, same temperature range (-40°C to +85°C) | Select MAX802MESA only if required by legacy BOM or distributor stock alignment; no design impact. |
| MAX706RCSA | 2.63V reset threshold, 140ms pulse width, no battery switchover; includes manual reset input and active-high RESET output | Suitable for +3.3V systems or designs requiring manual reset override; not usable for battery-backed RAM retention | Choose MAX706RCSA only for lower-voltage μPs without backup power needs; incompatible for VOUT/VBATT functionality. |
Compared with MAX692AESA, MAX802MESA offers identical supervision performance and drop-in compatibility, while MAX706RCSA trades battery support and 4.40V threshold for lower-voltage operation and manual reset - making it unsuitable for brownout-resilient RAM backup but viable for simpler +3.3V monitoring.
Availability
MAX692AESA is available at Aetrix Electronics and suitable for industrial process monitors, battery-powered controllers, critical μP power monitoring, and intelligent instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX692AESA 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, automotive, and communications applications, with expertise in power management and reliability-critical subsystems.
The MAX692AESA belongs to Maxim's microprocessor supervisory circuit family, engineered specifically for deterministic power-up sequencing, brownout resilience, and long-term battery-backed memory retention in harsh-environment embedded systems.
FAQ
What is the guaranteed minimum VCC level at which MAX692AESA asserts RESET?
The MAX692AESA guarantees RESET assertion down to VCC = 1.2V across its full operating temperature range of -40°C to +85°C. This specification ensures reliable reset initiation even during deep brownout events where the main supply collapses gradually, preventing μP execution from entering undefined states before reset is fully established.
Does MAX692AESA support automatic switchover to backup battery during power failure?
Yes, the MAX692AESA supports automatic switchover: when VCC falls below 4.40V, and VBATT exceeds VCC by at least 20mV, the internal 80Ω PMOS switch connects VBATT to VOUT. This preserves CMOS RAM contents without external circuitry, drawing only 50nA in backup mode - confirmed in the Electrical Characteristics table under "ISUPPLY in Battery-Backup Mode".
What is the watchdog timeout period for MAX692AESA, and how is it cleared?
The MAX692AESA features a 1.6s nominal watchdog timeout period. The internal timer is cleared by any rising or falling edge on the WDI pin, by assertion of RESET, or by placing WDI in a high-impedance (three-state) condition. If WDI remains static (high or low) for ≥1.6s, RESET is triggered - a behavior verified in the "Watchdog Timeout" parameter table and Detailed Description section.
Can MAX692AESA monitor power supplies other than +5V?
Yes, the MAX692AESA's PFI input accepts externally scaled voltages referenced to its internal 1.25V comparator threshold. Using a resistor divider, users can monitor +3.3V, +12V, or even negative rails (via level-shifting circuits shown in Figure 7), with PFO asserting low when the divided voltage drops below 1.25V - a capability explicitly documented in the Applications Information section.
What package type and temperature range does MAX692AESA use?
The MAX692AESA uses an 8-pin SOIC (SO) package with RoHS-compliant lead-free finish and is rated for operation from -40°C to +85°C. This is confirmed in the Ordering Information table, where "MAX692AESA" is listed with "-40°C to +85°C" temperature range and "8 SO" package - matching the S8+2 package outline referenced in the Package Information section.
MAX692AESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
MAX692AESA FAQ
1.How can I place an order for MAX692AESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692AESA 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 MAX692AESA reliable?
The price and inventory of MAX692AESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692AESA is usually 5 days.
3.What payment methods are accepted for MAX692AESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692AESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692AESA?
MAX692AESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692AESA 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 MAX692AESA?
For technical support, including MAX692AESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692AESA requirements.
6.How does Aetrix verify that MAX692AESA is sourced from the original manufacturer or authorized distributors?
All MAX692AESA 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 MAX692AESA meets industry standards.
7.What is the process for return or replacement of MAX692AESA?
All MAX692AESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX692AESA, 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 MAX692AESA part is unused and in its original packaging.
Return procedure for MAX692AESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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