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Analog Devices Inc./Maxim Integrated MAX692ACSA+T
- Part No.:
- MAX692ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX692ACSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,972
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Product details
Overview
The MAX692ACSA+T from Maxim Integrated is a microprocessor supervisory circuit providing precision reset generation, battery-backup switchover, watchdog timer (1.6s timeout), and power-fail detection (1.25V threshold) for +5V systems. It asserts active-low RESET during power-up, brownout (VCC < 4.40V), and watchdog timeout, with 200ms pulse width, and switches VOUT to VBATT when VCC drops below reset threshold-used in battery-powered controllers and critical μP monitoring.
For engineers reviewing the MAX692ACSA+T datasheet, MAX692ACSA+T pinout, MAX692ACSA+T application, or MAX692ACSA+T equivalent, key selection criteria include its 4.40V reset threshold, 200μA quiescent current, 50nA battery-backup mode current, guaranteed RESET assertion down to VCC = 1V, and compatibility with lithium backup batteries up to 4.55V.
Technical Context
The MAX692ACSA+T integrates four independent functional blocks: a precision voltage monitor with 4.40V ±2% reset threshold, a 1.6s watchdog timer cleared by WDI edge transitions, a 1.25V reference-based power-fail comparator driving PFO, and a dual-path power switch routing VCC or VBATT to VOUT based on voltage comparison and hysteresis (40mV).
Its reset generator guarantees logic-low output down to VCC = 1V, supports bidirectional μP reset I/O via external 4.7kΩ pull-up, disables power-fail comparator during battery-backup mode, and uses internal 5Ω (VCC→VOUT) and 80Ω (VBATT→VOUT) PMOS switches with automatic switchover at ±20mV thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±2% - triggers RESET when VCC falls below this level; ensures reliable brownout detection in +5V systems |
| Reset Pulse Width | 200ms - holds μP in reset long enough for stable power recovery before code execution resumes |
| Watchdog Timeout | 1.6s - detects software lockup if WDI is not toggled; restarts on rising/falling edges or RESET assertion |
| Quiescent Current | 200μA - enables low-power operation in active mode without compromising supervision accuracy |
| Battery-Backup Current | 50nA - minimizes self-discharge of lithium backup batteries during extended power loss |
| Power-Fail Threshold | 1.25V - fixed internal reference for PFI comparator; allows flexible external voltage divider for custom supply monitoring |
| VOUT Switch Resistance | 5Ω (VCC path), 80Ω (VBATT path) - limits voltage drop under load while maintaining RAM retention during switchover |
Pinout & Package
MAX692ACSA+T is housed in an 8-pin SOIC package (SO) with gull-wing leads, RoHS-compliant, rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VOUT | CMOS RAM supply output | Switches between VCC and VBATT based on voltage comparison; delivers regulated +5V or backup battery voltage to RAM |
| 2: VCC | +5V main supply input | Primary power source; powers internal circuitry and drives VOUT until brownout condition occurs |
| 3: GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for accurate threshold detection |
| 4: PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V reference |
| 5: PFO | Power-fail output | Open-drain output signaling undervoltage condition; used to trigger μP interrupt before power collapse |
| 6: WDI | Watchdog timer input | Edge-sensitive input; clears internal 1.6s timer on rising/falling transitions; floating disables watchdog |
| 7: RESET | Active-low reset output | Push-pull output asserting logic low for 200ms during power-up, brownout, or watchdog timeout |
| 8: VBATT | Backup battery input | Accepts 2.8V–4.55V lithium battery; connects to VOUT only when VCC < reset threshold and VBATT > VCC + 20mV |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.40V ±2% - eliminates need for external resistor dividers while meeting industrial tolerance requirements |
| Guaranteed RESET at low VCC | Asserts valid logic low down to VCC = 1V - ensures μP remains held in reset even during deep brownout |
| Ultra-low battery-backup current | 50nA typical - extends lithium battery life beyond 10 years in standby applications |
| Integrated battery switchover | Automatic 5Ω/80Ω PMOS switching with 40mV hysteresis - prevents oscillation during slow VCC decay |
| Dedicated power-fail comparator | Independent 1.25V reference with 400ns response - enables early warning of supply degradation without affecting reset timing |
Applications
| Battery-Powered Controllers | Critical μP Power Monitoring |
|---|---|
Use Scenario: Industrial programmable logic controllers (PLCs) operating from primary +5V supply with coin-cell lithium backup. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, RAM backup switchover, and watchdog safety net during mains interruption. Use Value: Prevents data corruption in nonvolatile RAM during 100ms–5s power gaps; maintains real-time clock and configuration state. | Use Scenario: Medical infusion pump with safety-critical firmware requiring deterministic boot sequence after power recovery. IC Role / Device Role / Timing Role: Reset generator ensuring μP starts from known state only after VCC stabilizes above 4.40V for ≥200ms. Use Value: Eliminates race conditions during power ramp; guarantees firmware integrity before motor activation. |
| Intelligent Instruments | Embedded Data Loggers |
Use Scenario: Portable gas analyzer with sensor calibration memory and battery-backed SRAM. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main supply for reset and provides PFO-triggered save-before-shutdown sequence. Use Value: Enables 200ms window to flush volatile sensor readings to EEPROM prior to power collapse. | Use Scenario: Environmental monitoring node deployed in remote locations with solar charging and Li-SOCl₂ backup. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor managing switchover to battery during nighttime power loss. Use Value: Draws only 50nA from 3.6V battery during multi-year deployment, preserving >95% capacity over 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MCSA | Identical electrical specs and pinout; same 4.40V reset threshold, 1.6s watchdog, and 8-pin SO package | No functional difference; MAX802M is rebranded MAX692A with identical qualification and production flow | Select MAX802MCSA if sourcing from distributors listing MAX802M as primary stock; fully interchangeable |
| MAX706RCSA+ | 2.63V reset threshold, no battery switchover, no PFI/PFO comparator; adds manual reset input | Suitable for +3.3V systems or designs needing manual reset but not backup power management | Choose MAX706RCSA+ only if lower reset voltage and manual reset are required; not a functional substitute for battery-switchover use cases |
Compared with MAX692ACSA+T, MAX802MCSA offers identical supervision functionality and drop-in compatibility, while MAX706RCSA+ trades battery support and power-fail detection for manual reset and lower-voltage operation-making it unsuitable for RAM backup or +5V brownout monitoring.
Availability
MAX692ACSA+T is available at Aetrix Electronics and suitable for battery-powered controllers, critical μP power monitoring, and intelligent instruments requiring stable component supply across industrial temperature ranges and long-lifecycle deployments.
Supply support for MAX692ACSA+T 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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.
The MAX692A product line delivers integrated power-supply supervision for microprocessor systems, combining reset, watchdog, battery switchover, and power-fail detection in single-chip solutions targeting reliability-critical embedded control.
FAQ
What is the reset threshold voltage of the MAX692ACSA+T?
The MAX692ACSA+T has a nominal reset threshold voltage of 4.40V, with guaranteed accuracy of ±2% over temperature. This value is factory-trimmed and applies specifically to the MAX692A variant; it triggers active-low RESET when VCC falls below this level during power-down or brownout conditions. The MAX692ACSA+T does not support adjustable reset thresholds.
Does the MAX692ACSA+T support active-high reset output?
No, the MAX692ACSA+T provides only an active-low RESET output. The active-high RESET output is exclusive to the MAX805L variant. For applications requiring active-high reset, the MAX692ACSA+T must be paired with an external inverter or replaced with MAX805LCSA+; using MAX692ACSA+T directly will assert logic low during fault conditions.
What is the maximum allowable backup battery voltage for the MAX692ACSA+T?
The MAX692ACSA+T supports a maximum backup battery voltage of 4.55V at the VBATT pin, as specified in Table 2 of the datasheet. Exceeding this voltage risks forward-biasing the internal substrate diode (D1) when VCC is near the reset threshold, potentially causing unintended current flow and system instability.
How does the watchdog timer in the MAX692ACSA+T operate?
The MAX692ACSA+T watchdog timer times out after 1.6 seconds if the WDI pin is held static (high or low); it resets on any rising or falling edge. The timer is also cleared automatically when RESET is asserted or WDI is three-stated. Its 50ns minimum pulse width detection ensures robustness against noise, and it remains disabled if WDI floats due to internal 35% VCC bias.
Can the MAX692ACSA+T monitor negative supply rails?
Yes, the MAX692ACSA+T's PFI input can monitor negative voltages using an external resistor network (Figure 7 in the datasheet). When the negative rail degrades (less negative), the PFI voltage rises above 1.25V, causing PFO to go high. Accuracy depends on resistor tolerances and PFI input current (±25nA max), so precision resistors are recommended for critical applications.
MAX692ACSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX692ACSA+T FAQ
1.How can I place an order for MAX692ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692ACSA+T 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 MAX692ACSA+T reliable?
The price and inventory of MAX692ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX692ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692ACSA+T?
MAX692ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692ACSA+T 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 MAX692ACSA+T?
For technical support, including MAX692ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692ACSA+T requirements.
6.How does Aetrix verify that MAX692ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX692ACSA+T 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 MAX692ACSA+T meets industry standards.
7.What is the process for return or replacement of MAX692ACSA+T?
All MAX692ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX692ACSA+T, 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 MAX692ACSA+T part is unused and in its original packaging.
Return procedure for MAX692ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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