My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX814LESA+
- Part No.:
- MAX814LESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814LESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:196
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX814LESA+ 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 ±1% worst-case reset threshold accuracy (4.7V), 200ms reset pulse width, active-low RESET output, and guaranteed RESET validity down to VCC = 1V. It is used in medical equipment and portable battery-powered devices requiring reliable brownout protection.
For engineers reviewing the MAX814LESA+ datasheet, MAX814LESA+ pinout, MAX814LESA+ application, or MAX814LESA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing and voltage thresholds, real-world use cases, and validated alternative parts with documented technical differences.
Technical Context
The MAX814LESA+ implements a precision reset comparator with fixed 4.7V trip point (±1% tolerance), a dedicated low-line detector with 60mV hysteresis above the reset threshold, and independent power-fail monitoring via PFI/PFO with 2.50V reference. Its internal 150µA MR pull-up enables direct switch-to-GND manual reset without external components.
All logic outputs (RESET, PFO, LOW LINE) are CMOS-compatible with rail-to-rail drive capability; RESET remains valid and asserted below 1V VCC, and the device rejects fast transients on VCC via built-in glitch immunity - critical for noisy industrial and portable environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% (worst-case 4.65V min), optimized for 5.0V ±5% supply systems |
| Reset Pulse Width | 200ms minimum - ensures µP initialization completes before release |
| Supply Current | 75µA max at +25°C - enables multi-year operation in coin-cell–powered devices |
| VCC Operating Range | 1.0V to 5.5V - RESET remains valid and low until VCC drops below 1V |
| Low-Line Threshold | 60mV above reset threshold (≈4.76V) - provides early brownout warning before reset asserts |
| Power-Fail Reference | 2.50V on PFI - allows early warning of +5V rail collapse before system failure |
| MR Input Threshold | 1.10V max (low), 0.7×VCC min (high) - compatible with TTL/CMOS logic and mechanical switches |
Pinout & Package
MAX814LESA+ is housed in an 8-pin SO (SOIC-8) package with standard 150-mil body width and gull-wing leads. Pin 1 is marked by a beveled corner or dot; the device is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low input with 150µA internal pull-up; triggers reset when pulled ≤1.10V; accepts switch or logic drive |
| 2 (VCC) | Positive Supply Input | Primary power rail input; reset assertion begins when VCC falls below 4.65V; RESET valid down to 1.0V |
| 3 (GND) | Ground Reference | System ground return 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 | Open-drain output sinking ≥1.2mA when PFI < 2.50V - signals µP to initiate orderly shutdown |
| 6 (LOW LINE) | Low-Line Output | Active-low, open-drain output asserting ~4.76V (60mV above reset); provides NMI-capable early warning |
| 7 (RESET) | Reset Output | Active-low, push-pull output; guaranteed logic low (≤0.4V) during reset; holds µP in known state |
| 8 (RESET) | Active-High Reset Output | Inverted copy of pin 7; logic high during reset - directly interfaces with µP inputs requiring active-high reset |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and guarantees system-level reset margin across temperature, voltage, and process variation |
| Low-Line Detector (60mV Hysteresis) | Provides deterministic early warning at ~4.76V - enables µP to save data before reset occurs |
| Integrated 150µA MR Pull-Up | Allows direct connection of momentary switch to GND without external resistor - reduces BOM count and layout area |
| Power-Supply Glitch Immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Valid RESET to VCC = 1V | Ensures µP remains held in reset during deep brownout - avoids undefined execution as supply collapses |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
|
Use Scenario: Battery-powered infusion pump operating from single Li-ion cell with buck-boost regulator supplying stable +5V. IC Role / Device Role / Timing Role: Supervises +5V rail integrity, asserts RESET on brownout, and triggers LOW LINE interrupt to save therapy parameters before shutdown. Use Value: Prevents corrupted dose delivery by ensuring µP only executes commands when supply meets 4.65V minimum - enabled by ±1% threshold and 200ms pulse hold. |
Use Scenario: Handheld diagnostic scanner powered by removable AA batteries with declining voltage profile. IC Role / Device Role / Timing Role: Monitors regulated +5V output; uses LOW LINE output to trigger µP NMI at 4.76V, initiating graceful UI shutdown and flash write completion. Use Value: Extends usable battery life by enabling full function down to 4.65V VCC while guaranteeing safe reset behavior - supported by 75µA quiescent current. |
| Controllers | Critical µP Power Monitoring |
|
Use Scenario: Industrial PLC controller with redundant +5V supplies and watchdog-independent reset path. IC Role / Device Role / Timing Role: Provides primary reset generation and PFI-based early warning of auxiliary supply failure; RESET output drives µP reset pin and status LED driver. Use Value: Ensures deterministic startup and fault response - achieved via guaranteed 200ms reset pulse and 2.50V PFI comparator decoupled from VCC sensing. |
Use Scenario: Avionics data acquisition module requiring fail-safe reset under rapid VCC droop (e.g., engine start transient). IC Role / Device Role / Timing Role: Acts as primary brownout detector; leverages glitch immunity to ignore <30µs transients while asserting RESET within 140ms of sustained drop below 4.65V. Use Value: Maintains system integrity during aircraft electrical load dumps - validated by absolute maximum rating of -0.3V to +6.0V on VCC and transient rejection curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LEPA+ | Same electrical specs, but in 8-pin PDIP package (not SOIC); higher thermal resistance and larger footprint | Suitable for through-hole prototyping or legacy board rework where SOIC footprint unavailable | Select MAX814LEPA+ only when DIP assembly is required; SOIC version offers better thermal performance and density |
| TPS3808G18DBVR | Lower quiescent current (1.8µA), adjustable reset threshold (via external resistor), no LOW LINE output, no PFI/PFO | Better for ultra-low-power always-on systems; lacks dual-voltage monitoring and early-warning capability of MAX814LESA+ | Choose TPS3808G18DBVR for battery life-critical designs without need for power-fail warning or low-line detection |
Compared with MAX814LESA+, MAX814LEPA+ offers identical functionality in a through-hole package, while TPS3808G18DBVR trades low-line and power-fail features for ultra-low supply current and threshold adjustability - making each suitable for distinct system-level trade-offs in reliability, power, and monitoring depth.
Availability
MAX814LESA+ is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, controllers, and critical µP power monitoring requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX814LESA+ 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/MAX815/MAX816 family was designed specifically for robust microprocessor supervision in safety-critical and portable systems - delivering precision reset, early power-fail warning, and low-voltage operability without external trimming.
FAQ
What is the exact reset threshold voltage of the MAX814LESA+?
The MAX814LESA+ has a factory-trimmed reset threshold of 4.70V with ±1% worst-case accuracy, meaning the actual trip point falls between 4.65V and 4.75V across temperature, voltage, and process variations. This value is fixed and corresponds to the "L" suffix in the part number. The threshold is specified at VCC rising and falling conditions and is guaranteed over the full commercial temperature range (0°C to +70°C).
Does the MAX814LESA+ provide both active-low and active-high reset outputs?
Yes, the MAX814LESA+ provides two independent reset outputs: pin 7 (RESET) is active-low, and pin 8 (RESET) is active-high - the logical inverse of pin 7. Both outputs are push-pull and fully specified over the entire operating range. This dual-output architecture eliminates the need for external inverters when interfacing with µPs that require either polarity, simplifying design and improving noise immunity.
Can the MAX814LESA+ monitor voltages other than VCC?
Yes, the MAX814LESA+ can monitor external voltages using its PFI input. By connecting a resistive divider from the target voltage to PFI, the device compares the divided voltage against its internal 2.50V reference. For example, a +12V rail can be monitored by scaling it to 2.50V at PFI - triggering PFO when the rail drops below ~11.0V. This capability is explicitly validated in the MAX814 datasheet Figure 11 and Application Information section.
What is the purpose of the LOW LINE output on the MAX814LESA+?
The LOW LINE output on the MAX814LESA+ is an active-low, open-drain signal that asserts when VCC falls to approximately 60mV above the reset threshold (~4.76V). It serves as an early brownout warning - allowing the µP to execute critical housekeeping (e.g., saving state, disabling peripherals) before RESET is asserted at 4.65V. Its timing and hysteresis are fully characterized in the datasheet's Typical Operating Characteristics.
Is the MAX814LESA+ suitable for battery-powered applications with strict current budgets?
Yes, the MAX814LESA+ draws only 75µA maximum supply current at +25°C, with typical consumption dropping to ~50µA at room temperature and 3.3V VCC. Its ultra-low quiescent current, combined with guaranteed RESET validity down to VCC = 1V, makes it ideal for coin-cell– or AA-powered devices requiring multi-year shelf life and reliable low-voltage operation - confirmed by Figure 5 in the official datasheet.
MAX814LESA+ 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:
- 4.7V
- 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
MAX814LESA+ FAQ
1.How can I place an order for MAX814LESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814LESA+ 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 MAX814LESA+ reliable?
The price and inventory of MAX814LESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814LESA+ is usually 5 days.
3.What payment methods are accepted for MAX814LESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814LESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814LESA+?
MAX814LESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814LESA+ 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 MAX814LESA+?
For technical support, including MAX814LESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814LESA+ requirements.
6.How does Aetrix verify that MAX814LESA+ is sourced from the original manufacturer or authorized distributors?
All MAX814LESA+ 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 MAX814LESA+ meets industry standards.
7.What is the process for return or replacement of MAX814LESA+?
All MAX814LESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814LESA+, 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 MAX814LESA+ part is unused and in its original packaging.
Return procedure for MAX814LESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814LESA+ 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…
