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Analog Devices Inc./Maxim Integrated MAX814NCSA+
- Part No.:
- MAX814NCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814NCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,007
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Product details
Overview
MAX814NCSA+ from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit providing power-on reset, manual reset, power-fail monitoring, and low-line detection for +5V systems. It features a 4.55V ±1% reset threshold, 200ms reset pulse width, active-low RESET output, guaranteed operation down to VCC = 1V, and 75µA max supply current. It is used in medical equipment and portable battery-powered devices requiring reliable brownout protection.
For engineers reviewing the MAX814NCSA+ datasheet, MAX814NCSA+ pinout, MAX814NCSA+ application, or MAX814NCSA+ equivalent, key selection criteria include reset threshold accuracy (±1%), low-line detector offset (60mV above reset), PFI comparator reference (2.50V), manual reset timing (250ns MR-to-RESET delay), and SO-8 package compatibility with legacy DIP footprints.
Technical Context
The MAX814NCSA+ implements a precision bandgap-based reset comparator with ±1% worst-case threshold accuracy over temperature and supply variation. Its low-line detector uses a separate comparator biased 60mV above the main reset threshold, enabling early warning before full reset assertion.
It integrates a 150µA internal MR pullup, supports CMOS/TTL-level manual reset input, and provides glitch-immune reset generation - ignoring transients ≤30µs at 100mV overdrive below VRT. The PFI input compares against a fixed 2.50V internal reference, independent of VCC regulation.
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 always-on battery-backed subsystems without compromising runtime. |
| Low-Line Offset | 60mV above reset threshold - provides deterministic early-warning window for orderly shutdown before reset asserts. |
| PFI Reference | 2.50V fixed - allows precise undervoltage detection on auxiliary supplies (e.g., +12V via resistor divider) without external references. |
| VCC Operating Range | 1.0V to 5.5V - guarantees RESET remains valid and asserted even during deep brownout, supporting fail-safe state retention. |
| MR Input Threshold | 1.10V low / 0.7×VCC high - compatible with standard CMOS logic and open-drain drivers without level-shifting. |
Pinout & Package
MAX814NCSA+ is housed in an 8-pin SO (Small Outline) package, pin-compatible with industry-standard SOIC-8 footprint (JEDEC MS-012), and functionally identical to the 8-pin PDIP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low trigger with 150µA internal pullup; asserts RESET when pulled below 1.10V; accepts CMOS/TTL logic or switch-to-GND. |
| 2 VCC | Positive Supply Input | Primary power rail input; RESET remains asserted until VCC rises ≥4.55V and holds for 200ms; valid down to 1.0V. |
| 3 GND | Ground Reference | System ground return for all internal comparators, outputs, and bias circuits; must be low-impedance. |
| 4 PFI | Power-Fail Input | Undervoltage sense node compared to 2.50V internal reference; drives PFO low when voltage falls below threshold. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 2.50V; used to interrupt µP or trigger backup routines. |
| 6 LOW LINE | Low-Line Detector Output | Active-low output asserting when VCC falls 60mV above reset threshold; provides early warning before RESET. |
| 7 RESET | Reset Output | Active-low, push-pull output; sinks ≥3.2mA at 0.4V; guaranteed valid down to VCC = 1V. |
| 8 RESET | Reset Output (Active-High) | Inverted copy of pin 7; sources ≥800µA at VCC–1.5V; eliminates need for external inverter in active-high reset systems. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures system-level reset margin compliance across -40°C to +85°C and supply variation. |
| 60mV low-line detector offset | Enables deterministic 10–50ms advance warning before reset, allowing µP to save critical data before power collapse. |
| 2.50V fixed PFI reference | Permits accurate monitoring of non-VCC rails (e.g., +12V) using simple resistor dividers without external references or calibration. |
| Guaranteed RESET validity to VCC = 1V | Maintains fail-safe reset assertion during deep brownout, preventing µP runaway in battery-depleted or faulted conditions. |
| Glitch-immune reset comparator | Rejects transients ≤30µs at 100mV overdrive, preventing spurious resets in electrically noisy industrial or automotive environments. |
Applications
| Medical Equipment Power Monitoring | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Continuous vital-sign monitors powered by Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during battery voltage sag below 4.55V and triggering LOW LINE 60mV earlier to initiate data save. Use Value: Prevents data corruption and ensures deterministic restart after battery recharge, meeting IEC 60601-1 safety-critical timing requirements. | Use Scenario: Handheld diagnostic tools operating from single-cell Li-ion (2.7–4.2V) with boost-regulated 5V rail. IC Role / Device Role / Timing Role: Monitors regulated 5V VCC for brownout; uses PFI to track raw battery voltage via divider for end-of-life warning. Use Value: Extends usable battery life by initiating graceful shutdown at 3.2V battery voltage while maintaining 5V system integrity until final collapse. |
| Intelligent Instrumentation | Critical µP Power Monitoring |
Use Scenario: Benchtop multimeters with EEPROM-backed calibration constants and real-time clock. IC Role / Device Role / Timing Role: Provides 200ms reset pulse and LOW LINE signal to freeze ADC sampling and save settings before power loss. Use Value: Guarantees EEPROM write completion and RTC state preservation during AC mains interruption or battery swap. | Use Scenario: Industrial PLC CPU modules requiring guaranteed reset under line sags and EMI-induced transients. IC Role / Device Role / Timing Role: Acts as primary power supervisor with ±1% threshold accuracy and 30µs glitch immunity on VCC. Use Value: Meets IEC 61000-4-4 Level 3 surge immunity requirements without external filtering, reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LCSA+ | 4.70V ±1% reset threshold; 4.65V min trip point vs. MAX814NCSA+'s 4.55V/4.50V min. | Better suited for 5V ±5% supplies where higher reset threshold prevents nuisance resets during nominal ripple. | Select MAX814LCSA+ when system VCC tolerance is tighter and brownout margin must exceed 300mV. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 35µA quiescent current; no low-line output; different pinout (SOT-23-6). | Designed for 3.3V-only systems; lacks dual RESET outputs and early-warning capability of MAX814NCSA+. | Choose TPS3808G33DBVR only for space-constrained 3.3V designs where low-line detection is unnecessary. |
Compared with MAX814LCSA+, MAX814NCSA+ offers lower reset threshold for wider 5V supply tolerance (±10%), while TPS3808G33DBVR trades functionality (no LOW LINE, single reset polarity) for ultra-low power and smaller footprint - making MAX814NCSA+ optimal for feature-complete 5V supervisory needs.
Availability
MAX814NCSA+ is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, and intelligent instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MAX814NCSA+ 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 analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX814 series belongs to Maxim's µP supervisory product line, designed specifically for high-reliability power monitoring in medical, industrial, and portable systems where ±1% reset accuracy and multi-function integration are critical.
FAQ
What is the reset threshold voltage of the MAX814NCSA+?
The MAX814NCSA+ has a factory-set reset threshold of 4.55V ±1%, optimized for 5V systems with ±10% supply tolerance. This value is fixed and determined by the 'N' suffix in the part number. The threshold remains stable across temperature (-40°C to +85°C) and supply variation, ensuring consistent brownout detection without external calibration. The MAX814NCSA+ guarantees RESET assertion until VCC rises above 4.55V and holds for 200ms.
Does the MAX814NCSA+ provide both active-low and active-high reset outputs?
Yes, the MAX814NCSA+ provides dual reset outputs: pin 7 is active-low RESET, and pin 8 is active-high RESET (inverted). Both outputs are push-pull, with pin 7 sinking ≥3.2mA at 0.4V and pin 8 sourcing ≥800µA at VCC–1.5V. This eliminates the need for external inverters in systems requiring either polarity, and both outputs remain synchronized and valid down to VCC = 1V.
What is the function of the LOW LINE pin on the MAX814NCSA+?
The LOW LINE pin (pin 6) is an active-low early-warning output that asserts when VCC falls 60mV above the 4.55V reset threshold (i.e., at ~4.61V). It provides deterministic advance notice before full reset, enabling µPs to execute shutdown routines. Unlike RESET, LOW LINE has no minimum pulse width and responds immediately to VCC droop, making it ideal for NMI-triggered data save operations in MAX814NCSA+ applications.
Can the MAX814NCSA+ monitor voltages other than VCC?
Yes - the PFI (pin 4) input can monitor any DC voltage via an external resistor divider. With a fixed 2.50V internal reference, it supports monitoring of auxiliary rails like +12V (e.g., 11V trip point) or negative supplies (using level-shifting circuitry). When PFI falls below 2.50V, PFO (pin 5) pulls low to signal failure. This capability is fully documented for MAX814NCSA+ and requires no additional components beyond the divider network.
What is the maximum supply current of the MAX814NCSA+ and how does it vary with temperature?
The MAX814NCSA+ draws a maximum of 75µA supply current across its full operating range. Typical current is 45–55µA at +25°C (VCC = 5.0V), rising slightly to ~65µA at +85°C and falling to ~40µA at -40°C. This ultra-low, temperature-stable quiescent current enables use in always-on battery-backed subsystems, such as real-time clocks or SRAM keep-alive circuits, without impacting battery service life.
MAX814NCSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX814NCSA+ FAQ
1.How can I place an order for MAX814NCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814NCSA+ 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 MAX814NCSA+ reliable?
The price and inventory of MAX814NCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814NCSA+ is usually 5 days.
3.What payment methods are accepted for MAX814NCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814NCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814NCSA+?
MAX814NCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814NCSA+ 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 MAX814NCSA+?
For technical support, including MAX814NCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814NCSA+ requirements.
6.How does Aetrix verify that MAX814NCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX814NCSA+ 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 MAX814NCSA+ meets industry standards.
7.What is the process for return or replacement of MAX814NCSA+?
All MAX814NCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814NCSA+, 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 MAX814NCSA+ part is unused and in its original packaging.
Return procedure for MAX814NCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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