My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX814KESA+
- Part No.:
- MAX814KESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814KESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX814KESA+ 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, and guaranteed valid reset assertion down to VCC = 1V. It is used in medical equipment and portable battery-powered devices requiring reliable brownout detection and glitch immunity.
For engineers reviewing the MAX814KESA+ datasheet, MAX814KESA+ pinout, MAX814KESA+ application, or MAX814KESA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing and threshold behavior, and validated alternative options for 4.8V µP supervision in commercial-temperature industrial and portable designs.
Technical Context
The MAX814KESA+ implements a precision voltage comparator with ±1% worst-case reset threshold accuracy referenced to an internal bandgap, coupled with a 200ms monostable delay timer that ensures stable release after VCC crosses the 4.80V trip point. Its low-line detector provides a separate 60mV-above-reset-threshold warning signal (LOW LINE) with 2mV hysteresis, independent of the main reset path.
It integrates a 150µA internal MR pull-up current, power-fail comparator with 2.50V reference (PFI/PFO), and robust immunity to fast VCC transients - ignoring negative glitches ≤30µs at 100mV overdrive. All logic outputs are CMOS-compatible with rail-to-rail drive capability and guaranteed VOL ≤ 0.4V at ISINK = 3.2mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - precisely triggers reset when +5V supply falls below 4.752V (min), ensuring compatibility with 5.0V ±4% systems. |
| Reset Pulse Width | 200ms (typ) - guarantees µP initialization time exceeds typical boot sequence requirements for 8/16-bit controllers. |
| Supply Current | 75µA max - enables use in always-on battery-backed subsystems without compromising runtime. |
| VCC Operating Range | 1.0V to 5.5V - RESET remains valid and asserted as low down to 1V, supporting graceful shutdown during deep brownout. |
| Power-Fail Reference | 2.50V - PFI comparator detects undervoltage on auxiliary rails (e.g., +12V via divider), enabling early warning before VCC collapse. |
| Low-Line Offset | 60mV above reset threshold - provides 140ms advance warning before reset assertion, sufficient for NMI-driven save routines. |
| MR Input Threshold | 1.10V (low), 0.7×VCC (high) - compatible with TTL/CMOS logic and open-drain drivers without external level-shifting. |
Pinout & Package
MAX814KESA+ is housed in an 8-pin SOIC package (SO-8, 150mil width) with gull-wing leads, RoHS-compliant and lead-free (+ suffix). Pin 1 is marked by a beveled corner or dot; device orientation follows standard JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 150µA internal pull-up; asserts RESET when pulled below 1.10V; debounced internally - no external RC needed. |
| 2 VCC | Positive Supply Input | Primary power rail input (1.0–5.5V); reset comparator monitors this node directly; powers all internal circuitry including PFO output stage. |
| 3 GND | Ground Reference | Analog and digital ground return; must be low-impedance connection to minimize noise coupling into reset comparator inputs. |
| 4 PFI | Power-Fail Input | High-impedance analog input referenced to 2.50V; accepts voltage dividers from auxiliary supplies (e.g., +12V → ~2.5V) for early fail detection. |
| 5 PFO | Power-Fail Output | Open-drain CMOS output sinking ≥1.2mA at VOL ≤ 0.4V; signals PFI undervoltage event to µP interrupt line or status register. |
| 6 LOW LINE | Low-Line Warning Output | Active-low CMOS output asserting when VCC drops to 4.86V (4.80V + 60mV); provides non-reset NMI trigger for pre-brownout housekeeping. |
| 7 RESET | Active-Low Reset Output | Push-pull CMOS output driving µP /RESET pin; guaranteed low (≤0.4V) during reset; holds low ≥200ms after VCC recovery. |
| 8 RESET | Active-High Reset Output | Inverted copy of pin 7; drives /RESET-inverted inputs or logic enabling circuits requiring high-true reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures deterministic reset across temperature (-40°C to +85°C), line, and load variations in safety-critical systems. |
| Guaranteed RESET Valid to VCC = 1V | Enables controlled shutdown sequencing in battery-powered devices where VCC decays slowly below 2V, preventing undefined µP states. |
| Power-Supply Glitch Immunity | Rejects VCC transients ≤30µs at 100mV overdrive - prevents spurious resets during switching noise or ESD events on shared power rails. |
| Independent Low-Line Detector | Provides 60mV headroom warning before reset, allowing µP to execute critical save routines without relying on watchdog or software polling. |
| Integrated 150µA MR Pull-Up | Permits direct switch-to-GND manual reset implementation with no external components - reduces BOM count and PCB area in space-constrained designs. |
Applications
| Medical Diagnostic Equipment | Industrial Programmable Logic Controllers |
|---|---|
Use Scenario: Power sequencing and brownout protection in portable ultrasound units with dual +5V/+3.3V rails and battery backup. IC Role / Device Role / Timing Role: Primary reset supervisor monitoring +5V main supply; asserts /RESET and LOW LINE to initiate data flush and safe state entry prior to shutdown. Use Value: Prevents corrupted image buffers and EEPROM writes during partial power loss, meeting IEC 62304 Class C software safety requirements. |
Use Scenario: Reliable reset generation in DIN-rail mounted PLC modules exposed to wide ambient temperature swings and noisy 24VDC field wiring. IC Role / Device Role / Timing Role: Supervises 5V logic rail derived from isolated DC/DC converter; uses PFI to monitor auxiliary 24V supply via resistor divider for predictive failure alert. Use Value: Enables deterministic fault logging and hot-swap-safe reinitialization without firmware intervention, reducing MTTR in factory automation. |
| Handheld Test Instruments | Set-Top Box Power Management |
Use Scenario: Battery-operated multimeter with auto-power-off and memory retention, requiring precise low-voltage cutoff before SRAM data loss. IC Role / Device Role / Timing Role: Monitors regulated +5V rail; leverages LOW LINE output to trigger µP-initiated capacitor discharge and flash save before VCC drops below 4.80V. Use Value: Extends usable battery life by 12–18% versus fixed-threshold supervisors, while guaranteeing non-volatile storage integrity. |
Use Scenario: Consumer STB with multiple voltage domains (+5V, +3.3V, +1.8V) and HDMI hot-plug detection, needing coordinated reset during AC dropout. IC Role / Device Role / Timing Role: Acts as master reset controller; uses PFO to interrupt µP on +12V standby rail sag, initiating graceful HDMI link teardown and DRAM self-refresh. Use Value: Avoids HDMI handshake failures and video artifacts during brief grid interruptions, improving CE compliance and user experience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+ | 4.70V ±1% reset threshold (vs. 4.80V); 10mV lower trip point; identical pinout, timing, and feature set. | Suitable for 5.0V ±5% systems where wider supply tolerance is acceptable; less margin against 4.75V minimum IC operating voltage. | Select when system design targets full 5V ±5% operation and requires tighter alignment with legacy 4.7V reset standards. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 350ms default delay (adjustable); 2.5µA quiescent current; no LOW LINE or PFI/PFO functions. | Lacks early warning and auxiliary rail monitoring; optimized for ultra-low-power +3.3V-only applications, not dual-rail +5V/+3.3V systems. | Choose only for new +3.3V designs prioritizing nanoamp supply current over multi-function supervision and 4.8V accuracy. |
Compared with MAX814KESA+, MAX814LESA+ offers identical functionality at a lower reset voltage for broader supply tolerance, while TPS3808G33DBVR trades supervision versatility for extreme low-power operation - making MAX814KESA+ the optimal choice for precision 4.8V reset with early warning and auxiliary monitoring in mixed-voltage embedded systems.
Availability
MAX814KESA+ is available at Aetrix Electronics and suitable for medical diagnostic equipment, industrial programmable logic controllers, and handheld test instruments requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MAX814KESA+ 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 markets.
The MAX814 family was designed specifically for high-reliability microprocessor supervision in commercial and extended-temperature environments, emphasizing ±1% reset accuracy, low quiescent current, and integrated power-fail warning without external components.
FAQ
What is the exact reset threshold voltage of the MAX814KESA+?
The MAX814KESA+ has a factory-trimmed reset threshold of 4.80V ±1%, meaning the actual trip point falls between 4.752V and 4.848V across temperature and supply variations. This value is fixed and unadjustable - unlike the MAX816 - and is confirmed in the Electrical Characteristics table for +5V parts under the "VRT" parameter with K-suffix designation.
Does the MAX814KESA+ provide both active-high and active-low reset outputs?
Yes, the MAX814KESA+ provides two dedicated reset outputs: pin 7 is active-low RESET, and pin 8 is active-high RESET - the logical inverse of pin 7. Both outputs are push-pull CMOS with rail-to-rail drive strength, enabling direct interface to µPs requiring either polarity without external inverters.
Can the MAX814KESA+ monitor voltages other than VCC, such as a +12V rail?
Yes, the MAX814KESA+ can monitor auxiliary voltages using its PFI input. By connecting a resistor divider from the +12V rail to PFI (e.g., 340kΩ + 100kΩ), the voltage at PFI scales to ~2.50V - matching the internal PFI reference. When the +12V rail sags, PFO asserts low, triggering an interrupt or reset via PFO-to-MR connection.
What is the purpose of the LOW LINE pin on the MAX814KESA+?
The LOW LINE pin (pin 6) is an independent comparator output that goes low when VCC falls to 60mV above the 4.80V reset threshold - i.e., at ~4.86V. It provides early warning before reset assertion, allowing the µP to execute time-critical tasks like saving volatile data or disabling peripherals before full reset occurs.
Is the MAX814KESA+ suitable for battery-powered applications with strict current budgets?
Yes, the MAX814KESA+ draws only 75µA maximum supply current across temperature and voltage, making it well-suited for battery-backed or portable systems. Its guaranteed RESET validity down to VCC = 1V further supports graceful shutdown during gradual battery discharge, preserving data integrity without external supervision circuitry.
MAX814KESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX814KESA+ FAQ
1.How can I place an order for MAX814KESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814KESA+ 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 MAX814KESA+ reliable?
The price and inventory of MAX814KESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814KESA+ is usually 5 days.
3.What payment methods are accepted for MAX814KESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814KESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814KESA+?
MAX814KESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814KESA+ 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 MAX814KESA+?
For technical support, including MAX814KESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814KESA+ requirements.
6.How does Aetrix verify that MAX814KESA+ is sourced from the original manufacturer or authorized distributors?
All MAX814KESA+ 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 MAX814KESA+ meets industry standards.
7.What is the process for return or replacement of MAX814KESA+?
All MAX814KESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814KESA+, 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 MAX814KESA+ part is unused and in its original packaging.
Return procedure for MAX814KESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814KESA+ 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…
