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Analog Devices Inc./Maxim Integrated MAX692CPA
- Part No.:
- MAX692CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX692CPA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,640
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Product details
Overview
The MAX692CPA from Maxim Integrated is an 8-pin microprocessor supervisory circuit providing precision reset generation, battery backup switchover, watchdog timer, and 1.3V power-fail detection for +5V systems. It features a 4.40V reset threshold, 50ms reset timeout, fixed 1.6s watchdog timeout, and operates over 0°C to +70°C in PDIP package - used in industrial controllers and embedded instrumentation requiring reliable power monitoring.
For engineers reviewing the MAX692CPA datasheet, MAX692CPA pinout, MAX692CPA application, or MAX692CPA equivalent, this page delivers verified functional identity, exact voltage thresholds, battery switchover behavior, watchdog timing constraints, and real-world integration guidance for µP-based systems with CMOS RAM backup.
Technical Context
The MAX692CPA integrates four core supervisory functions in a single 8-pin DIP: a precision 4.40V reset comparator with 40mV hysteresis, a fixed 1.6s watchdog timer triggered by WDI transitions, internal VOUT switching between VCC and VBATT (with 50mV/70mV switchover thresholds), and a 1.3V PFI comparator driving active-low PFO for early power-fail warning.
It lacks CE gating, BATT ON output, and adjustable timing - distinguishing it from 16-pin MAX691/MAX693 variants. Its reset pulse width is fixed at 50ms, and watchdog timeout is non-adjustable; operation is fully self-contained with no external oscillator or capacitor required for basic functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V (guaranteed 4.25V–4.50V); ensures reliable reset assertion for ±10% 5V supplies. |
| Reset Timeout Delay | 50ms (fixed); holds µP in reset long enough for crystal oscillator startup after power-up. |
| Watchdog Timeout | 1.6s (nominal, fixed); detects software lockup if WDI is not toggled within this window. |
| Battery Switchover | VCC-to-VBATT transition at 70mV rise / 50mV fall; prevents oscillation during slow brownouts. |
| PFI Threshold | 1.3V (±0.1V); enables configurable power-fail warning via external resistor divider. |
| Supply Current (Active) | 2–5mA typical; supports continuous monitoring without excessive system power draw. |
| Standby Current (VCC = 0V) | 0.6–1.0µA; extends backup battery life during extended power loss. |
Pinout & Package
MAX692CPA is housed in an 8-pin plastic DIP (PDIP) package with 0.3" width, lead finish Sn/Pb, and JEDEC MS-001 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Backup Battery Input | Accepts 2.0V–4.0V battery; internally compared to VCC to enable switchover to VOUT. |
| 2 (RESET) | Active-Low Reset Output | Drives µP RESET line low during power-up, brownout, or watchdog timeout; 50ms pulse width. |
| 3 (WDI) | Watchdog Input | Three-level input (low/mid/high); toggling required every ≤1.6s to prevent reset assertion. |
| 4 (PFO) | Power-Fail Output | Active-low open-drain output signaling PFI < 1.3V; used for NMI or system shutdown sequencing. |
| 5 (VOUT) | Switchover Power Output | Delivers higher of VCC or VBATT (up to 50mA); powers CMOS RAM during main supply loss. |
| 6 (VCC) | +5V Supply Input | Primary system supply input; monitored for reset and switchover decisions. |
| 7 (GND) | Ground Reference | Common 0V reference for all analog and digital circuitry; must be low-impedance. |
| 8 (PFI) | Power-Fail Input | Noninverting comparator input; connected to resistor divider for custom power-fail threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V reset threshold | Guaranteed 4.25V–4.50V range ensures compatibility with 5V ±10% supplies and eliminates need for external reset IC trimming. |
| Integrated battery switchover | Automatic VOUT sourcing from VBATT when VCC drops below VBATT – 70mV; sustains CMOS RAM without external MOSFET. |
| Fixed 1.6s watchdog timer | Hardware-enforced software execution check with no configuration overhead - simplifies firmware design and validation. |
| 1.3V PFI comparator | Enables early power-fail warning before reset threshold is reached, allowing time-critical data save operations. |
| Low 1µA standby current | Minimizes battery drain during extended backup mode, extending shelf life of 3V lithium coin cells. |
Applications
| Industrial Controller Monitoring | Automotive Body Control Module |
|---|---|
|
Use Scenario: Continuous operation in programmable logic controllers exposed to wide temperature swings and supply ripple. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during brownouts and generating PFO interrupt for EEPROM save prior to full power loss. Use Value: Prevents corrupted control state by ensuring µP only runs when VCC ≥ 4.40V and enabling deterministic data retention via 1.3V-triggered PFO. |
Use Scenario: Power management in vehicle door modules with battery-backed real-time clock and nonvolatile memory. IC Role / Device Role / Timing Role: Seamlessly switches VOUT from 5V rail to 3V backup battery upon ignition-off; monitors battery health via PFI. Use Value: Maintains RTC accuracy and retains fault logs during engine cranking dips using sub-1µA backup current and 2.0V–4.0V VBATT support. |
| Medical Instrument Power Sequencing | Point-of-Sale Terminal Data Integrity |
|
Use Scenario: Life-support adjacent diagnostic equipment requiring fail-safe boot and runtime supervision. IC Role / Device Role / Timing Role: Generates 50ms power-on RESET pulse synchronized to crystal startup; asserts watchdog reset if firmware hangs during sensor calibration. Use Value: Guarantees µP initialization completes before peripherals activate, eliminating race conditions in safety-critical boot sequences. |
Use Scenario: Transaction terminals storing credit card data in battery-backed SRAM during AC power interruption. IC Role / Device Role / Timing Role: Powers SRAM from VBATT via VOUT while asserting PFO to trigger immediate flash write before VCC falls below 4.40V. Use Value: Enables atomic transaction commit with hardware-enforced timing margin between PFO warning and RESET assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692CSA | Same electrical specs but in SOIC-8 package; 150°C/W thermal resistance vs. 65°C/W for PDIP. | Preferred for space-constrained PCBs; requires reflow-compatible layout and tighter thermal management. | Select MAX692CSA when board area is limited and surface-mount assembly is available. |
| TPS3809K33DBVR | Different reset threshold (3.08V), no battery switchover or watchdog; only power monitor + reset. | Suitable for 3.3V systems without backup requirements; lacks PFI, WDI, VBATT, VOUT functionality. | Choose TPS3809K33DBVR only if supervisory needs are limited to reset generation on 3.3V rails. |
Compared with MAX692CPA, MAX692CSA offers identical functionality in a smaller footprint but reduced thermal margin, while TPS3809K33DBVR provides simplified reset-only supervision at a different voltage level - neither replicates the integrated battery switchover and watchdog capability of the MAX692CPA.
Availability
MAX692CPA is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, medical instruments, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX692CPA 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 power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX692CPA belongs to the MAX690 family of microprocessor supervisory circuits, engineered specifically to consolidate reset, battery switchover, watchdog, and power-fail monitoring into compact 8-pin solutions for cost-sensitive, reliability-critical embedded systems.
FAQ
What is the exact reset voltage threshold of the MAX692CPA?
The MAX692CPA has a guaranteed reset voltage threshold of 4.40V, with a minimum of 4.25V and maximum of 4.50V across its operating temperature range. This 4.40V nominal value is specifically selected for compatibility with 5V ±10% power supplies, and differs from the 4.65V threshold used in MAX690/MAX691 variants. The MAX692CPA uses this lower threshold to ensure robust reset assertion even under worst-case supply tolerance conditions.
Does the MAX692CPA support adjustable watchdog timeout periods?
No, the MAX692CPA does not support adjustable watchdog timeout periods. Its watchdog timer is fixed at a nominal 1.6s timeout, with guaranteed minimum and maximum values of 1.0s and 2.25s respectively. Unlike the 16-pin MAX691/MAX693 variants, the MAX692CPA lacks OSC SEL and OSC IN pins required for external timing configuration - making it a simpler, cost-optimized solution where fixed timing suffices.
Can the MAX692CPA drive CMOS RAM directly during battery backup?
Yes, the MAX692CPA can drive CMOS RAM directly during battery backup via its VOUT pin, which delivers the higher of VCC or VBATT (up to 50mA). In battery backup mode (VCC < VBATT − 0.2V), VOUT tracks VBATT with a dropout of only 20mV at 250µA load. The MAX692CPA's 1µA typical standby current ensures minimal battery drain, supporting long-term data retention in SRAM or RTC circuits powered solely from VBATT.
What is the function of the PFI and PFO pins on the MAX692CPA?
The PFI (Power-Fail Input) pin on the MAX692CPA is a high-impedance comparator input referenced to an internal 1.3V threshold; it accepts a divided-down version of VCC or another supply to detect impending power loss. When PFI falls below 1.3V, the PFO (Power-Fail Output) pin goes low - an active-low, open-drain signal used to trigger non-maskable interrupts or initiate controlled shutdown. This allows the system to save critical data before VCC drops below the 4.40V reset threshold.
How does the MAX692CPA handle battery switchover hysteresis?
The MAX692CPA implements 20mV hysteresis in its battery switchover comparator to prevent oscillation during slow VCC transitions. Switchover from VCC to VBATT occurs when VCC falls to VBATT − 50mV; return from VBATT to VCC occurs when VCC rises to VBATT + 70mV. This asymmetric hysteresis (50mV down / 70mV up) ensures clean, glitch-free VOUT transitions and avoids repeated switching near the switchover point - critical for stable RAM power during brownout recovery.
MAX692CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX692CPA FAQ
1.How can I place an order for MAX692CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692CPA 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 MAX692CPA reliable?
The price and inventory of MAX692CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692CPA is usually 5 days.
3.What payment methods are accepted for MAX692CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692CPA?
MAX692CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692CPA 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 MAX692CPA?
For technical support, including MAX692CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692CPA requirements.
6.How does Aetrix verify that MAX692CPA is sourced from the original manufacturer or authorized distributors?
All MAX692CPA 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 MAX692CPA meets industry standards.
7.What is the process for return or replacement of MAX692CPA?
All MAX692CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX692CPA, 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 MAX692CPA part is unused and in its original packaging.
Return procedure for MAX692CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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