My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX814LCPA
- Part No.:
- MAX814LCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX814LCPA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,029
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX814LCPA 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 ±1% worst-case reset threshold accuracy (4.70V), 200ms reset pulse width, active-low RESET output, guaranteed valid operation down to VCC = 1V, and 75µA max supply current. It is used in medical equipment and portable battery-powered controllers requiring reliable brownout detection.
For engineers reviewing the MAX814LCPA datasheet, MAX814LCPA pinout, MAX814LCPA application, or MAX814LCPA equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset threshold behavior, low-line detector capability, and validated alternative options for 4.7V ±1% supervisory use cases.
Technical Context
The MAX814LCPA implements a precision voltage comparator with 4.70V ±1% trip point referenced to VCC, coupled with a 200ms monostable timer that ensures minimum reset assertion duration after threshold crossing. Its low-line detector activates 60mV above the reset threshold (i.e., at ~4.76V) with 2mV hysteresis, enabling early warning before full reset.
It integrates a manual-reset input (MR) with internal 150µA pull-up and CMOS-compatible thresholds (VMRLO = 1.1V, VMRHI = 0.7×VCC), and a dedicated power-fail comparator (PFI/PFO) with 2.50V reference - all operating reliably across 0°C to +70°C with no external components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - precisely triggers reset when VCC falls below 4.70V, ensuring compatibility with 5V ±5% supplies. |
| Reset Pulse Width | 200ms minimum - guarantees µP initialization completes before release, even during marginal brownouts. |
| Supply Current | 75µA max - enables use in always-on battery-powered systems without significant drain. |
| VCC Operating Range | 1.0V to 5.5V - RESET remains valid and asserted down to 1V, supporting deep brownout detection. |
| Low-Line Threshold | 4.76V (60mV above reset) - provides early warning before reset, allowing time for data save or graceful shutdown. |
| Power-Fail Reference | 2.50V - PFI comparator detects undervoltage on auxiliary rails (e.g., +12V via divider) before main VCC fails. |
| MR Input Threshold | 1.1V low / 0.7×VCC high - supports direct connection to switches or logic outputs without level-shifting. |
Pinout & Package
MAX814LCPA is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, RoHS-compliant lead-free finish (denoted by "+" suffix; CPA implies standard leaded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low trigger; internal 150µA pull-up to VCC; asserts RESET when pulled below 1.1V. |
| 2 VCC | Positive Power Supply | Main supply input; reset comparator monitors this rail; device operates from 1.0V to 5.5V. |
| 3 GND | Ground Reference | Common return path for all internal comparators, outputs, and bias circuits. |
| 4 PFI | Power-Fail Input | Monitors external voltage (e.g., +12V via divider); trips at 2.50V to activate PFO. |
| 5 PFO | Power-Fail Output | Active-low open-drain output; sinks ≥1.2mA when PFI < 2.50V, signals impending supply failure. |
| 6 LOW LINE | Low-Line Detector Output | Active-low open-drain; asserts ~4.76V (60mV above reset) to warn of imminent brownout. |
| 7 RESET | Reset Output | Active-low push-pull; guaranteed ≤0.4V at ISINK = 3.2mA; stays low until VCC > 4.70V + 200ms. |
| 8 RESET | Complementary Reset Output | Active-high push-pull; inverse of pin 7; provides direct interface to µP reset pins requiring high-active signal. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures deterministic reset timing across temperature, voltage, and process variation. |
| Guaranteed RESET Valid to VCC = 1V | Enables robust brownout detection in systems where supply collapses slowly - critical for data integrity in medical instruments. |
| Low-Line Detector (60mV Above Reset) | Provides 200µs–500µs advance warning before reset assertion, allowing µP to execute shutdown routines without external timers. |
| Power-Supply Glitch Immunity | Ignores transients ≤30µs at 100mV overdrive - prevents spurious resets in noisy industrial or automotive environments. |
| 75µA Max Supply Current | Supports multi-year battery life in portable diagnostics devices and handheld controllers without compromising supervision reliability. |
Applications
| Medical Diagnostic Equipment | Industrial Controller HMI |
|---|---|
|
Use Scenario: Portable ultrasound or ECG units powered by rechargeable Li-ion batteries experiencing gradual discharge and intermittent AC adapter dropout. IC Role / Device Role / Timing Role: Supervises main 5V rail; asserts LOW LINE at 4.76V to trigger firmware-initiated data save, then RESET at 4.70V if voltage continues falling. Use Value: Prevents corruption of patient waveform data during brownout by enabling deterministic, hardware-timed shutdown sequence before VCC drops below µP operational minimum. |
Use Scenario: PLC-based human-machine interface with isolated 5V logic supply subject to field wiring transients and load switching noise. IC Role / Device Role / Timing Role: Monitors 5V VCC with ±1% threshold; filters fast glitches via built-in comparator hysteresis and propagation delay design. Use Value: Eliminates false resets caused by 20–50µs bus noise spikes, improving system uptime and reducing field service calls. |
| Battery-Powered Data Logger | Set-Top Box Power Management |
|
Use Scenario: Remote environmental sensor node logging temperature/humidity to flash memory using coin-cell backup. IC Role / Device Role / Timing Role: Uses MR pin for user-initiated reset; leverages 75µA quiescent current to extend 10-year battery life; PFO monitors backup rail. Use Value: Enables reliable cold-start and brownout recovery while minimizing standby current - critical for unattended deployments. |
Use Scenario: Consumer STB with dual-rail power (5V logic, 12V tuner) requiring coordinated reset sequencing and early warning of 12V sag. IC Role / Device Role / Timing Role: PFI accepts 12V-to-2.5V resistor divider; PFO interrupts µP to initiate soft power-down before 5V reset occurs. Use Value: Avoids corrupted channel tuning state or HDMI handshake failures by decoupling 12V fault response from main logic reset timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LCSA | Same 4.70V ±1% reset threshold, identical functionality, but in 8-pin SO package (narrow-body, surface-mount). | Required for PCBs designed for SO-8 footprint; same thermal and electrical performance, but different reflow profile and board space usage. | Select MAX814LCSA when migrating from through-hole to SMT assembly or optimizing board density. |
| TPS3808G18DBVR | 4.75V fixed reset threshold (±0.5% typical), 350ms reset timeout, 2.5µA quiescent current, but lacks LOW LINE output and PFI/PFO pair. | Suitable for basic reset-only applications; cannot provide early power-fail warning or dual-rail monitoring without external circuitry. | Choose TPS3808G18DBVR only if ultra-low IQ is mandatory and low-line detection or auxiliary rail monitoring is unnecessary. |
Compared with MAX814LCPA, MAX814LCSA offers identical supervision functionality in surface-mount form, while TPS3808G18DBVR trades feature richness (LOW LINE, PFI/PFO) for lower quiescent current and tighter threshold tolerance - making it suitable only for simplified reset-only designs.
Availability
MAX814LCPA is available at Aetrix Electronics and suitable for medical diagnostic equipment, industrial controller HMIs, and battery-powered data loggers requiring stable component supply across long production lifecycles.
Supply support for MAX814LCPA 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 MAX814 family was designed specifically for high-reliability microprocessor supervision in safety-critical and battery-constrained systems, emphasizing ±1% threshold accuracy, glitch immunity, and multi-function integration (reset, low-line, power-fail) in minimal pin count.
FAQ
What is the exact reset threshold voltage of the MAX814LCPA?
The MAX814LCPA has a factory-trimmed reset threshold of 4.70V with ±1% worst-case accuracy across temperature and supply variation. This value is confirmed in the Electrical Characteristics table for "MAX814L, VCC rising" under parameter VRT, with min/typ/max values of 4.65V/4.70V/4.75V at TA = 0°C to +70°C. The 'L' suffix explicitly denotes the 4.70V variant within the MAX814 family.
Does the MAX814LCPA support both active-low and active-high reset outputs?
Yes, the MAX814LCPA provides dual reset outputs: pin 7 is active-low RESET, and pin 8 is active-high RESET (complementary). Both are push-pull outputs with specified VOL ≤ 0.4V (ISINK = 3.2mA) and VOH ≥ VCC − 1.5V (ISOURCE = 800µA), enabling direct interface to either polarity-sensitive µP reset inputs without external inverters.
Can the MAX814LCPA monitor a voltage other than VCC, such as a +12V rail?
Yes, the MAX814LCPA can monitor auxiliary voltages using its PFI pin. By connecting a resistor divider from +12V to GND with midpoint at PFI, the device triggers PFO when the divided voltage falls below 2.50V. For example, a 340kΩ/100kΩ divider yields ~11.0V trip point - confirmed in Figure 11 of the datasheet for MAX814K/L/N configurations.
What is the purpose of the LOW LINE pin on the MAX814LCPA?
The LOW LINE pin (pin 6) is an active-low open-drain output that asserts ~60mV above the main reset threshold (i.e., ~4.76V for MAX814LCPA). It provides early warning of impending brownout, giving the µP time to save data or enter low-power mode before the full RESET pulse occurs - a key differentiator versus basic reset supervisors.
Is the MAX814LCPA compatible with modern RoHS-compliant assembly processes?
Yes, the MAX814LCPA is available in lead-free packaging. Per the Ordering Information section, lead-free versions are denoted by adding a "+" symbol to the part number (e.g., MAX814LCPA+). The standard MAX814LCPA uses leaded terminations but is fully compatible with standard SnPb or Pb-free reflow profiles per JEDEC J-STD-020.
MAX814LCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.7V
- 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
MAX814LCPA FAQ
1.How can I place an order for MAX814LCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814LCPA 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 MAX814LCPA reliable?
The price and inventory of MAX814LCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814LCPA is usually 5 days.
3.What payment methods are accepted for MAX814LCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814LCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814LCPA?
MAX814LCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814LCPA 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 MAX814LCPA?
For technical support, including MAX814LCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814LCPA requirements.
6.How does Aetrix verify that MAX814LCPA is sourced from the original manufacturer or authorized distributors?
All MAX814LCPA 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 MAX814LCPA meets industry standards.
7.What is the process for return or replacement of MAX814LCPA?
All MAX814LCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX814LCPA, 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 MAX814LCPA part is unused and in its original packaging.
Return procedure for MAX814LCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814LCPA Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
