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Analog Devices Inc./Maxim Integrated MAX692AEPA+
- Part No.:
- MAX692AEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX692AEPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,580
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Product details
Overview
The MAX692AEPA+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, battery-backup switchover, watchdog timer, and power-fail detection in a single 8-pin PDIP package. It asserts an active-low RESET pulse for 200ms during power-up, brownout (VCC < 4.40V), or watchdog timeout (1.6s), supports CMOS RAM backup via VOUT switching, and features a 1.25V PFI comparator with ±2% accuracy for low-battery or supply monitoring in industrial controllers.
For engineers reviewing the MAX692AEPA+ datasheet, MAX692AEPA+ pinout, MAX692AEPA+ application, or MAX692AEPA+ equivalent, key selection criteria include its -40°C to +85°C operating range, 4.40V reset threshold, 200μA quiescent current, battery-switchover hysteresis (40mV), and compatibility with 5V μP systems requiring guaranteed RESET assertion down to VCC = 1.2V.
Technical Context
The MAX692AEPA+ integrates four independent functional blocks: a precision voltage monitor with 4.40V reset threshold and 40mV hysteresis, a 1.6s watchdog timer cleared by WDI edge transitions, a battery switchover circuit that connects VBATT to VOUT only when VCC falls below threshold and VBATT exceeds VCC by ≥20mV, and a 1.25V reference-based power-fail comparator driving PFO.
Its internal architecture uses a P-channel MOSFET for VOUT switching (5Ω on-resistance when VCC-powered, 80Ω in battery mode), guarantees RESET assertion at VCC ≥ 1.2V, and disables the watchdog when WDI is floating or three-stated-enabling flexible system-level reset control without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V nominal; triggers RESET when VCC drops below this level, ensuring reliable brownout protection for +5V systems. |
| Reset Pulse Width | 200ms typical; provides sufficient hold time for μP initialization and state clearing before release. |
| Watchdog Timeout | 1.6s nominal; detects software lockups by requiring periodic WDI toggling, preventing uncontrolled operation. |
| Quiescent Current | 200μA max at TA = TMIN to TMAX; minimizes standby power draw in battery-backed applications. |
| Battery-Backup Current | 5.0μA max in backup mode (VCC = 0V, VBATT = 2.8V); extends lithium battery life beyond 10 years in low-duty-cycle systems. |
| Power-Fail Accuracy | ±2% over temperature; enables precise undervoltage warning for regulated supplies without calibration. |
| Operating Temperature | -40°C to +85°C; qualified for industrial embedded environments including programmable logic controllers and remote sensors. |
Pinout & Package
MAX692AEPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body, RoHS-compliant lead finish indicated by the '+' suffix. Pin spacing follows JEDEC MS-001 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (via 5Ω PMOS) and VBATT (via 80Ω PMOS) based on VCC threshold crossing; delivers regulated backup power with <1μA drain when VCC < VBATT − 1V. |
| 2 - VCC | +5V supply input | Primary power rail; powers internal circuitry and enables VOUT-to-VCC connection; must be ≥1.2V for guaranteed RESET assertion. |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; requires low-impedance connection to minimize noise coupling into PFI/WDI. |
| 4 - PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when PFI < 1.25V; input bias current ≤25nA enables high-impedance sensing networks. |
| 5 - PFO | Power-fail output | Open-drain active-low signal; drives μP interrupt or status LED; sinks up to 3.2mA; disabled and forced low during battery backup. |
| 6 - WDI | Watchdog input | Edge-sensitive trigger; clears internal 1.6s timer on rising/falling edges; floating state disables watchdog; internal 35% VCC bias prevents false timeouts. |
| 7 - RESET | Active-low reset output | Push-pull output asserting low for 200ms after power-up/brownout/watchdog event; guaranteed logic low down to VCC = 1.2V. |
| 8 - VBATT | Backup battery input | Accepts 2.8V–4.55V lithium cells; enables automatic switchover when VCC drops; diode-connected substrate prevents reverse current above 0.6V overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.40V ±150mV (4.25V–4.50V) with 40mV hysteresis ensures clean, bounce-free reset assertion during slow VCC ramps. |
| Low-power battery mode | 5.0μA max supply current when VCC = 0V enables >10-year shelf life with CR2032 coin cells in metering applications. |
| Guaranteed reset at low VCC | RESET remains valid down to VCC = 1.2V, supporting brownout recovery in systems with weak or decaying supplies. |
| Integrated power-fail comparator | 1.25V internal reference with ±2% accuracy eliminates need for external voltage references in supply monitoring circuits. |
| Robust watchdog interface | 50ns minimum WDI pulse width tolerance allows use with fast μP GPIOs; internal bias avoids pull-up/pull-down resistors. |
Applications
| Industrial Programmable Logic Controllers | Smart Energy Meters |
|---|---|
Use Scenario: PLCs deployed in factory automation require deterministic reset behavior during line sags and generator transitions. IC Role / Device Role / Timing Role: MAX692AEPA+ monitors 5V rail, asserts RESET within 2µs of VCC drop below 4.40V, and holds reset for 200ms to ensure full μP reinitialization. Use Value: Prevents corrupted I/O states and firmware crashes during 100ms–500ms AC line interruptions common in industrial settings. | Use Scenario: Electricity meters with real-time clocks and nonvolatile memory must retain data during grid outages lasting minutes to hours. IC Role / Device Role / Timing Role: MAX692AEPA+ switches VOUT to a 3.6V lithium battery when mains fail, maintaining RAM and RTC power with <1μA quiescent draw. Use Value: Enables >10-year battery life while preserving tariff data and time-of-use logs without supercapacitor derating or leakage compensation. |
| Medical Diagnostic Handhelds | Ruggedized Data Loggers |
Use Scenario: Portable ultrasound or ECG devices operate from rechargeable Li-ion packs whose voltage declines from 4.2V to 3.0V during discharge. IC Role / Device Role / Timing Role: MAX692AEPA+ uses PFI to monitor battery voltage via resistor divider, triggering PFO interrupt before critical brownout to initiate safe shutdown. Use Value: Provides 200ms advance warning at 3.2V battery level, allowing storage of last waveform segment and EEPROM write completion. | Use Scenario: Environmental loggers deployed in remote locations experience wide temperature swings (-40°C to +85°C) and infrequent maintenance cycles. IC Role / Device Role / Timing Role: MAX692AEPA+ supervises the host μP, enabling watchdog recovery from flash corruption caused by thermal stress or ESD events. Use Value: 1.6s watchdog timeout ensures firmware hangs are resolved autonomously, eliminating field service visits for stuck units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MEPA+ | Identical reset threshold (4.40V), same pinout, but specified with ±2% power-fail accuracy over temperature vs. MAX692AEPA+'s unspecified PFI tolerance. | Preferred where calibrated supply monitoring is required (e.g., revenue-grade metering), not needed for basic brownout detection. | Select MAX802MEPA+ if PFI accuracy traceability is mandated; otherwise MAX692AEPA+ offers identical core supervision at lower cost. |
| MAX706RESA+ | 4.40V reset threshold, 200ms reset pulse, but lacks battery switchover and PFI comparator; SO-8 only, no PDIP option. | Suitable for μP reset-only applications without backup power or supply monitoring needs. | Choose MAX706RESA+ only when board space constraints prohibit PDIP or battery backup is unnecessary. |
Compared with MAX802MEPA+, MAX692AEPA+ trades guaranteed PFI accuracy for broader legacy support and identical functionality in brownout/wd/battery contexts; versus MAX706RESA+, it adds critical battery management and supply monitoring at the cost of higher pin count and PDIP availability.
Availability
MAX692AEPA+ is available at Aetrix Electronics and suitable for industrial programmable logic controllers, smart energy meters, medical diagnostic handhelds, and ruggedized data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX692AEPA+ 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 MAX692A product line delivers integrated microprocessor supervision-including reset, watchdog, battery switchover, and power-fail detection-for embedded systems where deterministic startup, fault recovery, and data retention are essential.
FAQ
What is the guaranteed minimum VCC level at which MAX692AEPA+ asserts RESET?
The MAX692AEPA+ guarantees RESET assertion down to VCC = 1.2V across its full operating temperature range (-40°C to +85°C). This ensures reliable reset hold during severe brownouts where the supply may sag below nominal levels but remain above the absolute minimum required for internal logic operation. The specification is verified per Electrical Characteristics table, with ISINK = 100μA test condition.
Does MAX692AEPA+ support active-high reset outputs?
No, MAX692AEPA+ provides only an active-low RESET output. The active-high variant is the MAX805L series (e.g., MAX805LEPA+), which substitutes RESET for RESET. MAX692AEPA+ does not include the inverted output driver or associated internal circuitry; attempting to invert externally requires additional components and compromises timing integrity.
How does the battery switchover hysteresis work in MAX692AEPA+?
MAX692AEPA+ implements 40mV hysteresis in its battery switchover: VBATT connects to VOUT when VCC falls 20mV below VBATT, and reconnects VCC to VOUT when VCC rises 20mV above VBATT. This prevents oscillation during slow VCC recovery and is implemented via dedicated comparator circuitry-not software or external components-ensuring robust operation without user configuration.
Can MAX692AEPA+ monitor negative supply rails?
Yes, MAX692AEPA+ can monitor negative rails using an external resistor network that level-shifts the negative voltage to the PFI input. As documented in Figure 7 of the datasheet, connecting R1/R2 between V− and GND creates a Thevenin-equivalent positive voltage at PFI. When the negative rail degrades (less negative), PFI rises above 1.25V and PFO goes high-enabling detection of -5V or -12V supply faults with ±2% accuracy.
What is the maximum allowable VBATT voltage for MAX692AEPA+?
The maximum allowable VBATT voltage for MAX692AEPA+ is 4.55V, as specified in Table 2 of the datasheet. Exceeding this risks forward conduction through the internal substrate diode (D1 in Figure 3) when VCC approaches the reset threshold, causing unintended current flow from VBATT to VCC and potential latch-up or accelerated battery drain.
MAX692AEPA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX692AEPA+ FAQ
1.How can I place an order for MAX692AEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692AEPA+ 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 MAX692AEPA+ reliable?
The price and inventory of MAX692AEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692AEPA+ is usually 5 days.
3.What payment methods are accepted for MAX692AEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692AEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692AEPA+?
MAX692AEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692AEPA+ 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 MAX692AEPA+?
For technical support, including MAX692AEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692AEPA+ requirements.
6.How does Aetrix verify that MAX692AEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX692AEPA+ 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 MAX692AEPA+ meets industry standards.
7.What is the process for return or replacement of MAX692AEPA+?
All MAX692AEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX692AEPA+, 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 MAX692AEPA+ part is unused and in its original packaging.
Return procedure for MAX692AEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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