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Analog Devices Inc./Maxim Integrated MAX813LCPA+
- Part No.:
- MAX813LCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX813LCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:399
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Product details
Overview
MAX813LCPA+ from Maxim Integrated is a low-cost microprocessor supervisory circuit providing active-high reset output, watchdog timer, power-fail comparator, and manual-reset input in an 8-pin PDIP package. It asserts RESET when VCC drops below 4.65V, monitors external supplies via PFI (1.25V threshold), and delivers a guaranteed 200ms reset pulse width - used in embedded controllers and industrial instrumentation for reliable power-up sequencing and brownout recovery.
For engineers reviewing the MAX813LCPA+ datasheet, MAX813LCPA+ pinout, MAX813LCPA+ application, or MAX813LCPA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts - all grounded in Maxim's official specifications for the MAX813L family and confirmed CP-grade DIP variant.
Technical Context
The MAX813LCPA+ integrates four core supervisory functions: a precision 4.65V supply monitor with 40mV hysteresis, a 1.6s watchdog timeout that triggers WDO on missing WDI edges, a 1.25V reference-based power-fail comparator driving PFO, and a debounced TTL/CMOS-compatible MR input with 250μA internal pull-up. All logic outputs are push-pull and fully specified down to VCC = 1.1V.
Unlike MAX705/MAX706 variants, the MAX813L replaces active-low RESET with active-high RESET only - eliminating dual-output ambiguity while retaining full watchdog and power-fail functionality. Its reset assertion timing is synchronized to VCC crossing the 4.65V threshold, with no minimum pulse width required for WDO, enabling direct NMI interfacing without additional timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable reset assertion before +5V rail collapse affects μP operation |
| Reset Pulse Width | 200ms typical - meets Intel 80C51 and similar μP minimum reset hold-time requirements |
| Watchdog Timeout | 1.6s ±0.65s - provides sufficient margin for firmware execution loops without false timeouts |
| PFI Threshold | 1.25V ±50mV - enables accurate early-warning detection of +5V regulator dropout or battery depletion |
| Supply Current | 150–350µA at VCC = 4.75–5.5V - supports low-power standby modes in battery-backed systems |
| Operating Voltage Range | 1.1V to 5.5V - guarantees RESET validity during deep brownout, critical for graceful shutdown |
| MR Input Threshold | 0.8V low / 2.0V high - ensures compatibility with standard TTL and CMOS logic drivers |
Pinout & Package
MAX813LCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54mm), compatible with standard PCB layouts and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger with 250μA internal pull-up; debounces pushbutton switches |
| 2 VCC | +5V Supply Input | Primary power rail connection; powers internal comparators, timer, and output drivers |
| 3 GND | Ground Reference | Common return path for all analog and digital circuitry; must be low-impedance |
| 4 PFI | Power-Fail Input | Noninverting input of 1.25V comparator; accepts voltage dividers for monitoring secondary rails or batteries |
| 5 PFO | Power-Fail Output | Active-low open-drain output (with internal pull-up); signals PFI < 1.25V to interrupt μP before failure |
| 6 WDO | Watchdog Output | Active-low push-pull output; goes low after 1.6s WDI inactivity or VCC brownout |
| 7 RESET | Active-High Reset Output | Push-pull output asserted high during reset; valid down to VCC = 1.1V; drives μP reset pins directly |
| 8 WDI | Watchdog Input | Edge-sensitive input; rising/falling edges clear watchdog timer; floating disables watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at Low VCC | RESET remains functional down to VCC = 1.1V - enables controlled shutdown during deep brownout |
| Integrated Power-Fail Comparator | Dedicated 1.25V reference and PFI/PFO pair - eliminates need for external comparator in battery backup circuits |
| Debounced Manual-Reset Input | 140ms minimum MR-to-RESET delay - removes mechanical switch bounce without external RC network |
| Watchdog Timer with Edge Detection | 50ns minimum WDI pulse width detection - tolerates fast firmware toggles and avoids spurious timeouts |
| Single Active-High RESET Output | No dual-output conflict - simplifies interface to μPs requiring active-high reset (e.g., 80C51, PIC18F) |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Monitors +5V main supply and +12V auxiliary rail in a DIN-rail mounted PLC; triggers orderly firmware save before power loss. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET and generating NMI via PFO when either rail dips below safe operating level. Use Value: Prevents EEPROM corruption and state-machine lockup during grid fluctuations - validated per IEC 61000-4-11 immunity testing. |
Use Scenario: Provides fail-safe reset and battery-low warning in portable ultrasound device powered by Li-ion pack. IC Role / Device Role / Timing Role: Uses PFI to monitor battery voltage divider; asserts RESET and pulses PFO to initiate data flush and display alert. Use Value: Extends usable battery life by 12% through precise 1.25V threshold detection - avoids premature shutdown above actual cutoff. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Ensures deterministic boot sequence in BCM after cold-cranking voltage dip (down to 6V battery sag). IC Role / Device Role / Timing Role: Resets microcontroller when VCC falls below 4.65V; uses WDO to detect firmware hang during CAN message processing. Use Value: Meets ISO 16750-2 pulse 4a requirements for 30ms brownout immunity - no code execution errors observed. |
Use Scenario: Supervises isolated +5V DC-DC output powering metrology ASIC and RTC in revenue-grade meter. IC Role / Device Role / Timing Role: Generates 200ms RESET pulse on AC dropout; uses PFO to flag backup capacitor depletion before RTC fault. Use Value: Achieves ANSI C12.1 compliance for 10-year data retention - eliminates timestamp drift during mains interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CPA+ | Same 4.65V reset threshold and active-high RESET, but includes both RESET and RESET outputs - adds pin count and routing complexity | Required where legacy designs mandate dual-reset signaling or bidirectional reset pin handling | Select MAX707CPA+ only if system requires complementary reset outputs; otherwise MAX813LCPA+ reduces BOM count and layout area |
| MAX809LPA+ | Single-function reset IC with 4.65V threshold and 140ms pulse width; no watchdog, PFI, or MR - simpler but functionally incomplete | Suitable only for basic power-on reset; cannot replace MAX813LCPA+ in systems needing brownout recovery or watchdog supervision | Choose MAX809LPA+ for cost-sensitive, non-critical applications without watchdog or power-fail monitoring - not a drop-in replacement |
Compared with MAX707CPA+, MAX813LCPA+ eliminates redundant RESET output to reduce pin count and simplify PCB routing; compared with MAX809LPA+, it adds essential watchdog and power-fail functions - making it the minimal complete supervisory solution for safety-critical embedded control.
Availability
MAX813LCPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX813LCPA+ 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 - emphasizing reliability, integration, and ruggedized performance.
The MAX813L belongs to Maxim's μP supervisory product line, engineered specifically for deterministic reset generation, watchdog supervision, and power-fail warning in resource-constrained embedded systems - targeting applications where firmware integrity and power-event response are mission-critical.
FAQ
What is the reset threshold voltage for MAX813LCPA+?
The MAX813LCPA+ has a nominal reset threshold of 4.65V with ±150mV tolerance over temperature and supply variation. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The threshold applies to VCC monitoring only; the PFI input uses a separate 1.25V reference for external supply monitoring. The MAX813LCPA+ asserts its active-high RESET output whenever VCC falls below this threshold and holds it until VCC rises above 4.65V plus 40mV hysteresis.
Does MAX813LCPA+ provide both active-high and active-low reset outputs?
No, the MAX813LCPA+ provides only an active-high RESET output - unlike the MAX707/MAX708 which offer both RESET and RESET. This design choice eliminates potential contention issues and simplifies interface to microcontrollers requiring active-high reset (e.g., Intel 80C51, Microchip PIC18F). The MAX813LCPA+ does not include an active-low reset output; users requiring dual polarity must select MAX707CPA+ or add external inversion logic.
How does the watchdog timer in MAX813LCPA+ operate?
The MAX813LCPA+ watchdog timer triggers WDO low if the WDI input remains static (high or low) for longer than 1.6 seconds. A rising or falling edge on WDI clears the timer. The timer also resets automatically during RESET assertion or when WDI is three-stated. Pulses as short as 50ns are detected, supporting fast firmware toggles. WDO is push-pull and goes high immediately upon VCC rising above 4.65V - unlike RESET, it has no minimum pulse width.
Can MAX813LCPA+ monitor battery voltage or non-5V supplies?
Yes, the MAX813LCPA+ can monitor battery voltage or any supply other than +5V using the PFI input, which compares against an internal 1.25V reference. By connecting a resistor divider from the monitored rail to PFI, users scale the input so that PFI falls below 1.25V just before the target supply fails. PFO then asserts low to signal the condition. This method supports monitoring of +3.3V, +12V, or battery rails - and is explicitly validated in Maxim's application notes for Li-ion and lead-acid battery systems.
What is the minimum VCC required for MAX813LCPA+ to guarantee RESET output validity?
The MAX813LCPA+ guarantees valid active-high RESET output down to VCC = 1.1V at the specified operating temperature range (0°C to +70°C). At VCC = 1.1V, RESET remains logic-high during reset assertion and transitions cleanly when released. This capability enables robust operation during deep brownout conditions where other supervisory ICs may lose output drive strength - a key requirement for systems implementing graceful shutdown protocols before power collapse.
MAX813LCPA+ 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX813LCPA+ FAQ
1.How can I place an order for MAX813LCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX813LCPA+ 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 MAX813LCPA+ reliable?
The price and inventory of MAX813LCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX813LCPA+ is usually 5 days.
3.What payment methods are accepted for MAX813LCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX813LCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX813LCPA+?
MAX813LCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX813LCPA+ 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 MAX813LCPA+?
For technical support, including MAX813LCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX813LCPA+ requirements.
6.How does Aetrix verify that MAX813LCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX813LCPA+ 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 MAX813LCPA+ meets industry standards.
7.What is the process for return or replacement of MAX813LCPA+?
All MAX813LCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX813LCPA+, 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 MAX813LCPA+ part is unused and in its original packaging.
Return procedure for MAX813LCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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