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Analog Devices Inc./Maxim Integrated MAX801NCPA+
- Part No.:
- MAX801NCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX801NCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,888
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Product details
Overview
MAX801NCPA+ from Maxim Integrated is a +5V microprocessor supervisory IC providing precision reset generation, battery switchover, low-line warning (NMI), and watchdog timer functionality. It features ±1.5% reset threshold accuracy (4.575V), 200ms reset timeout, guaranteed RESET validity down to VCC = 1V, and operates in 0°C to +70°C temperature range. It is used in portable/battery-powered equipment requiring reliable power-fail response and RAM backup.
For engineers reviewing the MAX801NCPA+ datasheet, MAX801NCPA+ pinout, MAX801NCPA+ application, or MAX801NCPA+ equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for critical µP power monitoring designs.
Technical Context
The MAX801NCPA+ integrates three independent comparators: reset (4.575V threshold), low-line (4.627V rising threshold, 52mV above reset), and battery switchover (VBATT–0.1V hysteresis). Its BiCMOS process enables ±1.5% reset accuracy and 68µA typical supply current in normal operation.
It implements a 1.6s watchdog timer with transition-triggered reset assertion, active-low RESET output with strong pull-down/weak pull-up, and active-high RESET output capable of sourcing/sinking 5mA. The device guarantees functional reset assertion even as VCC falls to 1V, supporting brownout resilience in embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures deterministic µP reset before system voltage violates minimum operating spec |
| Reset Timeout | 200ms - provides sufficient time for µP initialization and state recovery after power-up or brownout |
| Low-Line Threshold | 4.627V (52mV above reset) - triggers NMI for orderly software shutdown before reset occurs |
| Watchdog Timeout | 1.6s - detects stalled firmware execution and forces recovery without external components |
| VCC Operating Range | 4.5V to 5.5V - supports standard +5V µP rails with margin for ripple and droop |
| Supply Current | 68µA typical at VCC = 5V - enables long battery life in portable applications |
| RESET Validity | Down to VCC = 1V - maintains reset assertion integrity during deep brownout conditions |
Pinout & Package
MAX801NCPA+ is housed in an 8-pin plastic DIP (dual in-line package) with through-hole mounting and 0.3-inch body width. Pin spacing is 0.1 inch, compatible with standard PCB footprints and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Main supply input | +5V nominal rail; bypassed with 0.1µF capacitor to GND for noise immunity |
| 2: LOWLINE | Low-line comparator output | Active-low CMOS signal indicating VCC has dropped to 4.627V - used for NMI generation |
| 3: RESET | Active-low reset output | Strong pull-down / weak pull-up structure; wire-ORable; valid ≥1V VCC |
| 4: GND | Ground reference | 0V return path for all internal circuits and external decoupling |
| 5: RESET | Active-high reset output | Inverse of RESET; CMOS-compatible; sources/sinks 5mA; not wire-ORable |
| 6: WDI | Watchdog input | Transition-sensitive (low-to-high or high-to-low); unconnected disables watchdog |
| 7: BATT | Battery backup input | Accepts 2.0V–4.5V backup source; enables automatic switchover when VCC < VRST and VCC < VBATT |
| 8: OUT | Output supply | Delivers power to RAM/external circuitry from VCC or BATT; 250mA max in VCC mode, 20mA in battery mode |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset detection | ±1.5% threshold accuracy over temperature - eliminates need for external trimming in production |
| Integrated watchdog timer | 1.6s timeout with edge-triggered reset - prevents runaway code without external RC network |
| Low-line warning with hysteresis | 52mV offset above reset threshold +13mV hysteresis - avoids chatter during slow VCC decay |
| Battery switchover control | Automatic transfer to BATT when VCC falls below both VRST and VBATT - preserves RAM data during power loss |
| Guaranteed reset at low VCC | RESET remains valid down to VCC = 1V - ensures robust operation during deep brownout |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered handheld diagnostic units requiring RAM retention and graceful shutdown during battery depletion. IC Role / Device Role / Timing Role: Supervises main +5V rail, asserts LOWLINE at 4.627V to trigger NMI-driven save-and-halt routine, then asserts RESET at 4.575V if shutdown incomplete. Use Value: Prevents data corruption by ensuring RAM write completion before power collapse, leveraging 18µs CE hold timing (via MAX808 variant) or direct µP coordination. |
Use Scenario: DIN-rail mounted controllers exposed to wide ambient temperature swings and intermittent AC line drops. IC Role / Device Role / Timing Role: Monitors regulated +5V supply; generates 200ms RESET pulse on brownout; uses WDI to detect firmware lockup in safety-critical loops. Use Value: Enables autonomous recovery from transient faults without operator intervention, meeting IEC 61000-4-11 immunity requirements via precise 4.575V threshold. |
| Embedded Point-of-Sale Terminals | Test & Measurement Instruments |
Use Scenario: Credit card readers with flash memory and real-time clock, powered from USB or coin-cell backup. IC Role / Device Role / Timing Role: Provides VCC supervision, battery switchover to BATT pin, and RESET/LOWLINE signaling to ARM Cortex-M host MCU. Use Value: Ensures RTC and transaction log integrity during hot-swap battery replacement, supported by 1µA standby current and VCC = 0V battery-mode operation. |
Use Scenario: Benchtop oscilloscopes and spectrum analyzers requiring nonvolatile configuration storage and glitch-immune power sequencing. IC Role / Device Role / Timing Role: Generates clean, debounced RESET on power-up; suppresses false resets from sub-3µs VCC transients using built-in comparator hysteresis. Use Value: Eliminates spurious reboots during probe connection/disconnection events, validated by Maximum Transient Duration vs. Reset Threshold Overdrive curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SCPA+ | Single active-low RESET output only; no WDI, LOWLINE, or battery switchover; 4.63V threshold | Lacks NMI warning, watchdog, and backup power management - suitable only for basic reset-only use cases | Select when design requires minimal footprint and only power-on reset, not full supervisory functionality |
| TPS3809K33DBVR | 3.3V-specific (3.08V threshold); no battery switchover or LOWLINE; SOT-23-5 package | Designed for low-voltage µPs; incompatible with +5V systems and battery-backed RAM architectures | Choose only for new 3.3V designs where space constraints preclude DIP/SO packages and backup features are unnecessary |
Compared with MAX801NCPA+, MAX809SCPA+ omits critical functions required for battery-backed systems (WDI, LOWLINE, BATT/OUT), while TPS3809K33DBVR targets a different voltage domain and lacks switchover capability - neither serves as drop-in replacements, but both address narrower supervisory scopes.
Availability
MAX801NCPA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, embedded point-of-sale terminals, test & measurement instruments, and critical µP power monitoring requiring stable component supply across extended product lifecycles.
Supply support for MAX801NCPA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX801NCPA+ belongs to Maxim's µP supervisory product line, designed specifically for robust power monitoring and fail-safe recovery in battery-powered and mission-critical embedded systems operating from +5V rails.
FAQ
What is the exact reset threshold voltage of the MAX801NCPA+?
The MAX801NCPA+ has a nominal reset threshold voltage of 4.575V with ±1.5% accuracy over temperature. This value is confirmed in the Electrical Characteristics table under "VRST" for suffix 'N', and applies across the full operating temperature range of 0°C to +70°C. The threshold is factory-trimmed and does not require external calibration.
Does the MAX801NCPA+ support battery backup for CMOS RAM?
Yes, the MAX801NCPA+ supports battery backup via its BATT and OUT pins. When VCC falls below both the reset threshold (4.575V) and VBATT, the internal PMOS switch connects BATT to OUT, delivering up to 20mA to preserve RAM contents. The device guarantees switchover hysteresis and operates with SuperCap™/MaxCap™ energy storage devices.
How does the watchdog timer in the MAX801NCPA+ function?
The MAX801NCPA+ watchdog timer asserts RESET if the WDI pin remains static (high or low) for longer than 1.6 seconds. A rising or falling edge on WDI clears the timer. During RESET assertion, the timer is held inactive. The feature is disabled by leaving WDI unconnected, which internally biases it to ~1.8V via a voltage divider.
Can the MAX801NCPA+ generate a non-maskable interrupt (NMI)?
Yes, the MAX801NCPA+ provides an active-low LOWLINE output that goes low when VCC falls to 4.627V - 52mV above the 4.575V reset threshold. This signal is intended to drive the NMI input of a microprocessor, initiating an orderly software shutdown before RESET is asserted, and includes 13mV hysteresis to prevent chatter.
What package type and lead finish does the MAX801NCPA+ use?
The MAX801NCPA+ is supplied in an 8-pin plastic DIP (dual in-line package) with lead-free (RoHS-compliant) finish. The '+' suffix explicitly denotes lead-free packaging per Maxim's ordering conventions. It is compatible with standard 0.3-inch DIP sockets and wave soldering processes.
MAX801NCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX801NCPA+ FAQ
1.How can I place an order for MAX801NCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX801NCPA+ 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 MAX801NCPA+ reliable?
The price and inventory of MAX801NCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX801NCPA+ is usually 5 days.
3.What payment methods are accepted for MAX801NCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX801NCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX801NCPA+?
MAX801NCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX801NCPA+ 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 MAX801NCPA+?
For technical support, including MAX801NCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX801NCPA+ requirements.
6.How does Aetrix verify that MAX801NCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX801NCPA+ 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 MAX801NCPA+ meets industry standards.
7.What is the process for return or replacement of MAX801NCPA+?
All MAX801NCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX801NCPA+, 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 MAX801NCPA+ part is unused and in its original packaging.
Return procedure for MAX801NCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX801NCPA+ Tags
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MIC826SYMT-TR
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APX803S-31SA-7
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APX803L20-29SA-7
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