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Analog Devices Inc./Maxim Integrated MAX814NCPA+
- Part No.:
- MAX814NCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX814NCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,271
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Product details
Overview
MAX814NCPA+ from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit providing power-on reset, manual reset, and early power-fail warning functions for +5V systems. It features a 4.55V ±1% reset threshold, 200ms reset pulse width, active-low RESET output, and guaranteed valid reset assertion down to VCC = 1V. It is used in critical embedded controllers requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX814NCPA+ datasheet, MAX814NCPA+ pinout, MAX814NCPA+ application, or MAX814NCPA+ equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset timing behavior, power-fail comparator interface details, and validated alternative options for 5V µP monitoring designs.
Technical Context
The MAX814NCPA+ implements a precision voltage-monitoring architecture with independent reset and low-line comparators. Its reset comparator uses a trimmed bandgap reference to achieve ±1% worst-case accuracy over temperature and supply variation, while the low-line detector triggers 60mV above the reset threshold with 2mV hysteresis.
It integrates a manual-reset input with internal 150µA pullup, a power-fail input (PFI) referenced to 2.50V, and a push-pull PFO output capable of sinking ≥1.2mA. Unlike the MAX815/MAX816 variants, it lacks watchdog functionality and adjustable reset input - its reset threshold is fixed at 4.55V by the 'N' suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.55V ±1% - ensures reliable reset initiation across temperature and supply tolerance in 5V systems with ±10% rails. |
| Reset Pulse Width | 200ms minimum - guarantees µP initialization completes before release, meeting boot-time requirements of 8/16-bit controllers. |
| Supply Current | 75µA max - enables use in battery-backed or portable equipment without compromising runtime. |
| VCC Operating Range | 4.60V to 5.5V - supports full industrial 5V rail variation while maintaining reset validity down to 1V. |
| Power-Fail Reference | 2.50V - allows early warning detection of +5V supply collapse via external resistor divider on PFI. |
| Low-Line Threshold Offset | 60mV above reset threshold - provides deterministic pre-brownout interrupt for data save routines. |
| RESET Output Type | Active-low open-drain/push-pull - directly interfaces with CMOS/TTL µP reset inputs without level-shifting. |
Pinout & Package
MAX814NCPA+ is housed in an 8-pin plastic DIP package (0°C to +70°C operating range), with lead-free finish indicated by the '+' suffix. Pin assignments are electrically identical to the SO variant but differ mechanically in footprint and thermal characteristics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low trigger with internal 150µA pullup; asserts RESET when pulled below 1.10V; accepts CMOS/TTL logic or switch-to-GND. |
| 2 VCC | Positive Supply Input | Primary power source; RESET remains asserted until VCC rises above 4.55V and holds for 200ms. |
| 3 GND | Ground Reference | Common return path for all internal comparators and outputs; must be low-impedance for noise immunity. |
| 4 PFI | Power-Fail Input | Monitors external voltage divider; asserts PFO low when input falls below 2.50V - used for early warning. |
| 5 PFO | Power-Fail Output | Active-low open-drain output; sinks ≥1.2mA when PFI < 2.50V - connects to µP interrupt or reset chain. |
| 6 LOW LINE | Low-Line Detector Output | Active-low signal triggered when VCC drops 60mV above reset threshold; used for NMI-based pre-reset alert. |
| 7 RESET | Reset Output (Active-Low) | Guaranteed logic low (≤0.4V) down to VCC = 1V; meets µP reset hold-time requirements during brownout. |
| 8 RESET | Reset Output (Active-High) | Inverted copy of pin 7; provides direct compatibility with µPs requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Threshold Accuracy | Eliminates manual trimming and ensures first-pass system reliability across temperature, voltage, and process variation. |
| Guaranteed RESET Validity to VCC = 1V | Prevents undefined µP state during deep brownout; avoids latch-up or spurious execution when supply collapses. |
| Power-Supply Glitch Immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents false resets from switching noise or ESD. |
| Early Power-Fail Warning (PFI/PFO) | Enables µP to execute controlled shutdown, store nonvolatile data, and disable peripherals before VCC failure. |
| Low-Line Detector with 60mV Offset | Provides deterministic pre-reset interrupt window for time-critical housekeeping without requiring external timers. |
Applications
| Medical Infusion Pumps | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered infusion pump operating from 5V rail with backup coin cell; requires fail-safe shutdown before motor stall or dose error. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET on brownout and triggering PFO interrupt for EEPROM save prior to power loss. Use Value: Prevents incomplete drug delivery by guaranteeing µP executes full shutdown sequence before VCC drops below 4.55V. |
Use Scenario: DIN-rail mounted PLC with 5V logic supply subject to line surges and intermittent AC dropout. IC Role / Device Role / Timing Role: Primary reset generator monitoring VCC and providing LOW LINE NMI for watchdog-triggered diagnostics. Use Value: Enables deterministic fault logging and safe I/O deactivation within 200ms of undervoltage detection. |
| Set-Top Box Power Management | Portable Test Equipment |
Use Scenario: Consumer STB with dual 5V/3.3V rails where main 5V supply may sag during HDMI handshake bursts. IC Role / Device Role / Timing Role: VCC supervisor asserting RESET and LOW LINE to coordinate firmware recovery and HDMI link reset. Use Value: Avoids display artifacts and channel lock failures by synchronizing reset with power rail stabilization. |
Use Scenario: Handheld multimeter using 5V LDO from AA batteries; requires low-quiescent supervision to extend battery life. IC Role / Device Role / Timing Role: Low-power reset monitor enabling µP wake-from-sleep on button press and brownout detection. Use Value: Achieves >1000-hour shelf life with 75µA supply current while maintaining guaranteed reset at end-of-battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LCPA+ | 4.70V ±1% reset threshold; 4.65V min trip point - tighter tolerance for 5V ±5% supplies. | Better suited for systems requiring higher reset margin against 5V rail droop (e.g., legacy industrial backplanes). | Select MAX814LCPA+ when VCC tolerance is ±5% and µP minimum operating voltage is ≥4.65V. |
| TPS3808G33DBVR | 3.3V fixed threshold; 35µA typical supply current; no LOW LINE output; different pinout. | Designed for 3.3V-only systems; lacks pre-reset warning capability and dual RESET polarity. | Choose TPS3808G33DBVR only for cost-sensitive 3.3V applications where early warning and dual reset outputs are unnecessary. |
Compared with MAX814LCPA+, the MAX814NCPA+ offers lower reset threshold for wider 5V supply tolerance (±10%), while the TPS3808G33DBVR trades feature depth for ultra-low quiescent current in 3.3V space-constrained designs.
Availability
MAX814NCPA+ is available at Aetrix Electronics and suitable for medical infusion pumps, industrial PLC controllers, set-top box power management, and portable test equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX814NCPA+ 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 demanding industrial, medical, and communications applications.
The MAX814 series belongs to Maxim's µP supervisory product line, engineered specifically for high-accuracy, low-power reset generation and power-fail monitoring in 5V embedded control systems.
FAQ
What is the exact reset threshold voltage of the MAX814NCPA+?
The MAX814NCPA+ has a factory-trimmed reset threshold of 4.55V ±1%, specified over the full 0°C to +70°C commercial temperature range. This value is fixed by the 'N' suffix and applies under VCC = 4.60V to 5.5V conditions. The threshold remains stable across supply and temperature variations, ensuring consistent brownout detection in 5V systems with ±10% tolerance.
Does the MAX814NCPA+ include a watchdog timer function?
No, the MAX814NCPA+ does not include a watchdog timer. That function is exclusive to the MAX815 variant (e.g., MAX815NCPA+). The MAX814NCPA+ provides only power-on reset, manual reset, power-fail monitoring (PFI/PFO), and low-line detection (LOW LINE), making it suitable for simpler supervision tasks where software-level watchdog oversight is handled externally.
Can the MAX814NCPA+ monitor voltages other than VCC?
Yes - the MAX814NCPA+ can monitor auxiliary voltages using the PFI pin. By connecting a resistor divider from the target voltage (e.g., +12V) to PFI, and referencing it to the internal 2.50V comparator, the device asserts PFO when the monitored voltage falls below the calculated trip point. This enables early warning for multiple rails without adding discrete comparators.
What is the purpose of the LOW LINE pin on the MAX814NCPA+?
The LOW LINE pin on the MAX814NCPA+ provides an active-low pre-reset warning signal triggered when VCC falls 60mV above the 4.55V reset threshold (i.e., at ~4.61V). It is intended to drive a µP's NMI input, allowing firmware to initiate data save, peripheral disable, or diagnostic logging before the main RESET asserts - delivering deterministic response to incipient brownout.
Is the MAX814NCPA+ pin-compatible with other MAX814 variants like MAX814KCPA+ or MAX814LCPA+?
Yes - all MAX814 variants (K, L, N, T suffixes) share identical pinout, package, and functional interface. The only difference is the factory-set reset threshold voltage. Therefore, MAX814NCPA+ is a direct replacement for MAX814KCPA+ or MAX814LCPA+ in the same 8-pin DIP footprint, provided the 4.55V threshold meets the system's supply tolerance requirements.
MAX814NCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.55V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX814NCPA+ FAQ
1.How can I place an order for MAX814NCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814NCPA+ 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 MAX814NCPA+ reliable?
The price and inventory of MAX814NCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814NCPA+ is usually 5 days.
3.What payment methods are accepted for MAX814NCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814NCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814NCPA+?
MAX814NCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814NCPA+ 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 MAX814NCPA+?
For technical support, including MAX814NCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814NCPA+ requirements.
6.How does Aetrix verify that MAX814NCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX814NCPA+ 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 MAX814NCPA+ meets industry standards.
7.What is the process for return or replacement of MAX814NCPA+?
All MAX814NCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814NCPA+, 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 MAX814NCPA+ part is unused and in its original packaging.
Return procedure for MAX814NCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814NCPA+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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