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Analog Devices Inc./Maxim Integrated MAX814KCSA+
- Part No.:
- MAX814KCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814KCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:502
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Product details
Overview
MAX814KCSA+ 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 4.80V ±1% reset threshold, 200ms reset pulse width, active-low RESET output, guaranteed valid operation down to VCC = 1V, and 75µA max supply current - enabling reliable reset control in medical equipment and portable battery-powered devices.
For engineers reviewing the MAX814KCSA+ datasheet, MAX814KCSA+ pinout, MAX814KCSA+ application, or MAX814KCSA+ equivalent, key selection criteria include reset threshold accuracy (±1%), low-line detection capability (60mV above reset), power-fail comparator reference (2.50V), manual reset input with internal 150µA pullup, and SO-8 package compatibility with legacy DIP footprints.
Technical Context
The MAX814KCSA+ integrates a precision reset comparator with ±1% worst-case threshold accuracy, a dedicated low-line detector (60mV above reset threshold, 2mV hysteresis), and a power-fail comparator referenced to 2.50V. Its RESET output remains valid down to VCC = 1V, and it ignores fast transients on VCC via built-in glitch immunity.
Unlike the MAX815 (watchdog) or MAX816 (adjustable threshold), the MAX814KCSA+ uses fixed VCC monitoring only, provides both active-low and active-high RESET outputs, and includes the LOW LINE output for brownout warning prior to reset assertion - making it suitable for critical µP power monitoring where deterministic timing and voltage margining are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - ensures reset assertion at precisely defined VCC level for 5V systems with ±4% supply tolerance. |
| Reset Pulse Width | 200ms minimum - guarantees sufficient duration to fully initialize microprocessors after power-up or brownout recovery. |
| Supply Current | 75µA max - enables use in always-on, battery-backed applications without significant drain. |
| VCC Operating Range | 1.0V to 5.5V - RESET remains valid and functional even during deep brownout conditions down to 1V. |
| Power-Fail Reference | 2.50V - allows early warning of +5V rail collapse when PFI is connected via resistive divider. |
| Low-Line Offset | 60mV above reset threshold - provides deterministic pre-reset warning window for orderly shutdown. |
| Manual Reset Input | 1.10V logic threshold with 150µA internal pullup - supports direct switch-to-ground interface without external components. |
Pinout & Package
MAX814KCSA+ is housed in an 8-pin SO (Small Outline) package, pin-compatible with industry-standard SOIC-8 footprint and legacy 8-pin DIP. The device uses a standard dual-inline pinout with GND on pin 3 and VCC on pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input; triggers reset when pulled below 1.10V; internally pulled up to VCC with 150µA current. |
| 2 VCC | Positive Power Supply | Main supply input; reset asserted when VCC falls below 4.80V; RESET valid down to 1.0V. |
| 3 GND | Ground Reference | System ground return path for all internal comparators and outputs. |
| 4 PFI | Power-Fail Input | Monitors external voltage divider; comparator trips at 2.50V - used for early +5V rail failure detection. |
| 5 PFO | Power-Fail Output | Active-low open-drain output; sinks ≥1.2mA when PFI < 2.50V - signals µP to initiate safe shutdown. |
| 6 LOW LINE | Low-Line Warning Output | Active-low output asserting when VCC drops 60mV above reset threshold - provides pre-reset NMI warning. |
| 7 RESET | Active-Low Reset Output | Push-pull output; guaranteed ≤0.4V at 3.2mA sink; held low for ≥200ms after VCC crosses threshold. |
| 8 RESET | Active-High Reset Output | Inverted copy of pin 7; complementary logic for systems requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures deterministic reset across temperature, voltage, and process variation. |
| Guaranteed RESET Valid to VCC = 1V | Enables robust brownout handling in battery-powered systems where supply collapses gradually. |
| 60mV Low-Line Detection Offset | Provides precise, repeatable warning window before reset - critical for data save and state preservation. |
| 2.50V Power-Fail Comparator Reference | Allows accurate early detection of +5V rail degradation using simple resistor divider on PFI. |
| 75µA Max Supply Current | Supports multi-year operation in coin-cell or energy-harvesting applications without compromising supervision integrity. |
| Power-Supply Glitch Immunity | Rejects transients ≤30µs at 100mV overdrive - prevents spurious resets in electrically noisy environments. |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Power sequencing and fault-safe restart in portable ultrasound or infusion pumps where unexpected reset could compromise patient safety. IC Role / Device Role / Timing Role: Supervisory circuit asserting controlled reset during battery voltage sag or AC adapter disconnect. Use Value: 4.80V ±1% threshold and 200ms pulse ensure µP completes critical shutdown routines before power loss. |
Use Scenario: Long-life handheld diagnostic tools operating from single Li-ion cells with aging-related voltage drift. IC Role / Device Role / Timing Role: Low-power supervisor monitoring VCC and providing early low-line warning before brownout. Use Value: 75µA supply current and 1V operational floor extend usable battery life while maintaining supervision integrity. |
| Controllers | Intelligent Instruments |
Use Scenario: Industrial PLC I/O modules requiring deterministic reset behavior during 24VDC supply fluctuations. IC Role / Device Role / Timing Role: Primary reset generator with manual reset input for field service and watchdog-free operation. Use Value: Dual RESET outputs (active-low and active-high) simplify interface to diverse controller families. |
Use Scenario: Benchtop multimeters and spectrum analyzers needing fail-safe startup and power-fail data retention. IC Role / Device Role / Timing Role: Coordinated supervisor managing VCC reset, PFI-based rail monitoring, and LOW LINE pre-warning. Use Value: 2.50V PFI reference and 60mV low-line offset enable calibrated, repeatable warning thresholds. |
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 - optimized for 5V ±5% supplies. | Better suited for systems with wider input tolerance where full 5V rail range must be utilized. | Select MAX814LCSA+ when system design targets 4.70V reset with larger guard band against supply variation. |
| TPS3808G18DBVR | 1.8V fixed reset threshold; 350ms default delay; 2.5µA quiescent current - ultra-low-power alternative. | Designed for modern low-voltage MCUs (1.8V–3.3V); lacks LOW LINE output and dual RESET polarity. | Choose TPS3808G18DBVR only for new 1.8V designs prioritizing nanoamp supply current over feature parity. |
Compared with MAX814KCSA+, MAX814LCSA+ offers lower reset voltage for broader 5V supply coverage, while TPS3808G18DBVR trades feature completeness (no LOW LINE, no dual RESET) for extreme low-power operation - neither is pin-compatible, requiring PCB redesign.
Availability
MAX814KCSA+ is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, controllers, and intelligent instruments requiring stable component supply with long-term industrial lifecycle support.
Supply support for MAX814KCSA+ 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, medical, and communications applications.
The MAX814KCSA+ belongs to Maxim's µP supervisory product line, designed specifically for high-accuracy, low-power reset and power-fail monitoring in mission-critical embedded systems operating from +5V rails.
FAQ
What is the exact reset threshold voltage of the MAX814KCSA+?
The MAX814KCSA+ has a factory-trimmed reset threshold of 4.80V ±1%, meaning the actual trip point falls between 4.752V and 4.848V across temperature, voltage, and process variations. This value is confirmed in the Electrical Characteristics table for +5V parts under the "VRT" parameter with K-suffix designation, and is intended for 5.0V systems with ±4% supply tolerance.
Does the MAX814KCSA+ provide both active-low and active-high reset outputs?
Yes, the MAX814KCSA+ provides two independent reset outputs: pin 7 (RESET) is active-low push-pull, and pin 8 (RESET) is its active-high inverse. Both outputs are guaranteed to be in the correct logic state for VCC down to 1V, and both assert for a minimum of 200ms after VCC rises above the 4.80V threshold - enabling flexible interface with diverse microprocessor reset inputs.
How does the LOW LINE output function in the MAX814KCSA+?
The LOW LINE output (pin 6) on the MAX814KCSA+ asserts low when VCC falls to 60mV above the 4.80V reset threshold (i.e., ~4.86V), providing a deterministic pre-reset warning. It returns high immediately when VCC rises above that level. This signal is commonly routed to a non-maskable interrupt (NMI) input to trigger last-chance data save before full reset occurs.
Can the MAX814KCSA+ monitor voltages other than VCC?
Yes - while the primary reset function monitors VCC directly, the MAX814KCSA+ can monitor auxiliary rails using the PFI/PFO pair. By connecting a resistor divider to PFI, any voltage (e.g., +12V, +3.3V, or negative rails) can be scaled to trip the 2.50V internal comparator. When PFI falls below 2.50V, PFO pulls low to signal impending failure, independent of VCC status.
What is the maximum supply current specification for the MAX814KCSA+?
The MAX814KCSA+ draws a maximum supply current of 75µA across its full operating temperature range (0°C to +70°C) and supply voltage range (1.0V to 5.5V). This value is measured under worst-case conditions and is confirmed in the Electrical Characteristics table - making it suitable for always-on, battery-backed applications where ultra-low quiescent current is essential.
MAX814KCSA+ 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:
- 4.8V
- 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
MAX814KCSA+ FAQ
1.How can I place an order for MAX814KCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814KCSA+ 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 MAX814KCSA+ reliable?
The price and inventory of MAX814KCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814KCSA+ is usually 5 days.
3.What payment methods are accepted for MAX814KCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814KCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814KCSA+?
MAX814KCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814KCSA+ 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 MAX814KCSA+?
For technical support, including MAX814KCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814KCSA+ requirements.
6.How does Aetrix verify that MAX814KCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX814KCSA+ 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 MAX814KCSA+ meets industry standards.
7.What is the process for return or replacement of MAX814KCSA+?
All MAX814KCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814KCSA+, 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 MAX814KCSA+ part is unused and in its original packaging.
Return procedure for MAX814KCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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