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Analog Devices Inc./Maxim Integrated MAX692ACPA+
- Part No.:
- MAX692ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX692ACPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,347
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Product details
Overview
MAX692ACPA+ 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 DIP package. It asserts active-low RESET during power-up (VCC ≥ 1V), brownout (VCC < 4.40V), and watchdog timeout (1.6s), while delivering VOUT from VCC or VBATT with 5Ω/80Ω switch impedance and 200ms reset pulse width. It is used in battery-powered controllers requiring reliable μP initialization and RAM retention during supply interruption.
For engineers reviewing the MAX692ACPA+ datasheet, MAX692ACPA+ pinout, MAX692ACPA+ application, or MAX692ACPA+ equivalent, key selection criteria include its 4.40V reset threshold, guaranteed RESET assertion down to VCC = 1V, 200μA quiescent current, 50nA battery-backup mode current, and compatibility with lithium backup batteries up to 4.55V.
Technical Context
The MAX692ACPA+ integrates four independent functional blocks: a precision voltage monitor with 4.40V ±2% reset threshold and 40mV hysteresis; a 1.6s watchdog timer cleared by WDI edge transitions; a dual-path power switch routing VCC or VBATT to VOUT based on VCC–VBATT differential and reset state; and a 1.25V reference-based power-fail comparator (PFI/PFO) with 400ns response time.
Its internal architecture ensures deterministic behavior across temperature: RESET remains asserted until VCC rises 40mV above threshold after brownout recovery; battery switchover activates only when VCC falls below 4.40V *and* VBATT exceeds VCC by >20mV; PFO is forced low during battery-backup mode to conserve current; and WDI input bias (35% VCC, 50kΩ) disables watchdog if left floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±2% - guarantees reliable μP reset initiation before +5V supply dropout affects logic integrity |
| Reset Pulse Width | 200ms - meets minimum reset duration requirements for Intel 80Cxx, Motorola 68xxx, and Zilog Z80 families |
| Watchdog Timeout | 1.6s - provides sufficient margin for firmware service intervals while preventing spurious resets from noise |
| Quiescent Current | 200μA at VCC = 5V - enables long-term operation from primary supply without excessive standby drain |
| Battery-Backup Current | 50nA at VCC = 0V, VBATT = 2.8V - supports >10-year lithium battery life in CMOS RAM retention applications |
| VOUT Switch Impedance | 5Ω (VCC path), 80Ω (VBATT path) - limits voltage drop to <25mV at 5mA load, preserving RAM write margins |
| Power-Fail Comparator Accuracy | ±2% (MAX802L/M only) - not applicable to MAX692ACPA+; MAX692A series specifies ±2.5% typical over temp |
Pinout & Package
MAX692ACPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body, 0.100" lead pitch, and RoHS-compliant lead-free finish (indicated by '+' suffix). Pin 1 is VBATT, pin 2 is VCC, pin 3 is GND, pin 4 is PFI, pin 5 is PFO, pin 6 is WDI, pin 7 is RESET, and pin 8 is VOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VBATT | Backup-battery input | Connects to lithium cell (3.0–3.6V); enables automatic switchover to VOUT when VCC drops below 4.40V and VBATT > VCC +20mV |
| 2: VCC | +5V main supply input | Primary power source; powers internal circuitry and supplies VOUT via 5Ω PMOS switch when above reset threshold |
| 3: GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to system ground plane |
| 4: PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V reference (±2.5% over temp) |
| 5: PFO | Power-fail output | Open-drain active-low signal; triggers μP interrupt prior to supply collapse; forced low during battery-backup mode |
| 6: WDI | Watchdog input | Edge-sensitive control; clearing pulse must occur every 1.6s; floating or high-impedance state disables watchdog |
| 7: RESET | Active-low reset output | Guaranteed logic low from VCC ≥ 1V until 200ms after VCC exceeds 4.40V; drives μP reset pin directly |
| 8: VOUT | CMOS RAM supply output | Delivers regulated +5V (from VCC) or battery voltage (from VBATT) to static RAM; maintains data during main supply loss |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures μP remains held in reset even during deep brownout conditions where other supervisors fail |
| 200μA supply current (active), 50nA (battery-backup) | Enables multi-year operation from coin-cell backup without compromising primary supply efficiency |
| 40mV reset threshold hysteresis | Prevents oscillatory reset assertion during slow VCC ramp-down or noisy supply conditions |
| VBATT switchover controlled by VCC–VBATT differential | Eliminates false battery activation when VBATT slightly exceeds VCC during normal operation |
| 1.25V internal reference for PFI comparator | Provides stable undervoltage detection independent of VCC variations, enabling accurate pre-fail warning |
Applications
| Battery-Powered Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Portable data loggers powered by AA alkaline cells with SRAM retention requirement during battery replacement. IC Role / Device Role / Timing Role: Supervisory IC providing VOUT switchover to backup battery, 200ms RESET pulse on power-up, and PFO-triggered data save before shutdown. Use Value: Prevents RAM corruption during hot-swap battery changes; extends field service life by eliminating need for supercapacitor charging circuits. |
Use Scenario: Handheld multimeters with real-time clock and configuration memory operating from 3.6V lithium primary cell. IC Role / Device Role / Timing Role: Resets MCU on cold start, monitors main supply for low-battery warning via PFI, and maintains RTC power via VOUT during measurement cycles. Use Value: Guarantees deterministic boot sequence and preserves calibration data across 5000+ power cycles with no external components. |
| Critical μP Power Monitoring | Industrial Remote I/O Modules |
Use Scenario: PLC backplane modules requiring fail-safe reset during 24V DC supply ripple exceeding ±15%. IC Role / Device Role / Timing Role: Precision voltage monitor asserting RESET within 2µs of VCC crossing 4.40V threshold; WDI supervised by FPGA heartbeat signal. Use Value: Eliminates firmware lockup due to marginal supply conditions; reduces MTBF failure rate by 92% versus discrete RC reset networks. |
Use Scenario: DIN-rail mounted sensor interface units powered from unregulated 12–24V DC with local EEPROM storage. IC Role / Device Role / Timing Role: Generates clean RESET pulse during input voltage transients; uses PFO to trigger watchdog reset if 12V rail collapses faster than 10ms. Use Value: Maintains communication link integrity during factory power dips; avoids field returns caused by corrupted configuration writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Same functionality and specifications, but in 8-pin SOIC package (3.9mm × 4.9mm) instead of PDIP | Required for surface-mount PCB assembly; thermal resistance differs (SO: 5.88mW/°C derating above +70°C vs PDIP: 9.09mW/°C) | Select MAX692AESA+ for space-constrained designs or automated SMT production lines. |
| MAX802MCPA+ | Identical pinout and electrical specs; guaranteed ±2% power-fail accuracy (MAX692ACPA+ does not specify PFI accuracy) | Preferred in medical instrumentation where traceable ±2% PFI tolerance is mandated for regulatory compliance | Choose MAX802MCPA+ when certified power-fail comparator accuracy is required for safety-critical systems. |
Compared with MAX692ACPA+, MAX692AESA+ offers identical supervision performance in a smaller footprint but requires requalification for thermal management, while MAX802MCPA+ adds certified PFI accuracy at no cost to reset timing or battery-switching behavior-making it suitable for regulated environments where MAX692ACPA+ lacks documented comparator tolerance.
Availability
MAX692ACPA+ is available at Aetrix Electronics and suitable for battery-powered controllers, intelligent instruments, critical μP power monitoring, industrial remote I/O modules, and portable test equipment requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for MAX692ACPA+ 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, communications, and computing applications, with expertise in power management and supervisory circuits.
The MAX692ACPA+ belongs to Maxim's μP supervisory product line, engineered specifically for robust reset generation, battery-backed RAM retention, and early power-fail warning in resource-constrained embedded systems.
FAQ
What is the guaranteed minimum VCC level at which MAX692ACPA+ asserts RESET?
The MAX692ACPA+ guarantees RESET assertion down to VCC = 1V, ensuring the microprocessor remains held in reset during deep brownout conditions where many competing supervisors release reset prematurely. This specification is verified across the full 0°C to +70°C operating range and is critical for systems powered from depleting batteries or unstable supplies. The MAX692ACPA+ maintains this guarantee regardless of VBATT voltage or watchdog state.
Does MAX692ACPA+ support active-high reset outputs?
No, MAX692ACPA+ provides only active-low RESET output (pin 7). The active-high variant is the MAX805L series (e.g., MAX805LCPA+), which substitutes RESET for RESET and guarantees valid output down to VCC = 1.1V. MAX692ACPA+ cannot be configured for active-high operation; attempting to invert its RESET output externally requires additional logic and may compromise timing margins.
What is the maximum allowable VBATT voltage for MAX692ACPA+?
The maximum allowable VBATT voltage for MAX692ACPA+ is 4.55V, as specified in Table 2 of the datasheet. Exceeding this voltage risks forward-biasing the internal substrate diode (D1 in Figure 3) when VCC approaches the 4.40V reset threshold, causing unintended current flow from VBATT to VCC and potential device malfunction. Lithium cells (3.0–3.6V) and properly sized supercapacitors are safe; higher-voltage sources require external regulation.
How does the watchdog timer in MAX692ACPA+ behave when WDI is left unconnected?
When WDI (pin 6) is left floating, the MAX692ACPA+ watchdog timer is disabled because the internal 50kΩ pull-down biases WDI to ~35% of VCC, placing it in a non-logic state that prevents timeout triggering. This behavior is explicitly documented in Note 4 of the Electrical Characteristics table. No external pull-up or pull-down is required for watchdog disablement; however, connecting WDI to a microcontroller GPIO is necessary to enable supervision.
Can MAX692ACPA+ monitor negative supply rails?
Yes, MAX692ACPA+ can monitor negative rails using the external resistor network shown in Figure 7 of the datasheet. By referencing PFI to ground and applying the negative rail through R1/R2, the internal 1.25V comparator detects degradation when the magnitude of the negative voltage decreases. Accuracy depends on resistor tolerance and PFI input current (±25nA max); typical use cases include -5V or -12V supply monitoring in legacy instrumentation systems.
MAX692ACPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX692ACPA+ FAQ
1.How can I place an order for MAX692ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692ACPA+ 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 MAX692ACPA+ reliable?
The price and inventory of MAX692ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX692ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692ACPA+?
MAX692ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692ACPA+ 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 MAX692ACPA+?
For technical support, including MAX692ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692ACPA+ requirements.
6.How does Aetrix verify that MAX692ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX692ACPA+ 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 MAX692ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX692ACPA+?
All MAX692ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX692ACPA+, 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 MAX692ACPA+ part is unused and in its original packaging.
Return procedure for MAX692ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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