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Analog Devices Inc./Maxim Integrated MAX813LESA+T
- Part No.:
- MAX813LESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX813LESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,964
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Product details
Overview
The MAX813LESA+T from Maxim Integrated is a precision microprocessor supervisory circuit providing active-high reset output, watchdog timer, power-fail warning, and manual-reset input in an 8-pin SO package. It asserts RESET when VCC drops below 4.65V, delivers a guaranteed 200ms reset pulse width, monitors external supplies via 1.25V PFI threshold, and operates down to VCC = 1.2V - used in industrial controllers and embedded systems requiring reliable power-up/down sequencing and brownout protection.
For engineers reviewing the MAX813LESA+T datasheet, MAX813LESA+T pinout, MAX813LESA+T application, or MAX813LESA+T equivalent, this page delivers verified functional identity, exact pin roles, temperature-rated performance (–40°C to +85°C), true reset threshold hysteresis (40mV), and confirmed alternative parts with documented differences in reset polarity and watchdog behavior.
Technical Context
The MAX813LESA+T integrates four core supervisory functions: a precision 4.65V supply monitor with 40mV hysteresis, a 1.6s watchdog timeout with edge-sensitive WDI input, a 1.25V power-fail comparator for external voltage monitoring, and a debounced TTL/CMOS-compatible manual-reset input with 250μA internal pull-up.
Its active-high RESET output remains valid down to VCC = 1.2V (ISINK = 100μA), features guaranteed low-level voltage ≤0.3V, and exhibits 250ns MR-to-RESET delay. Unlike MAX705/MAX706 variants, it omits active-low RESET and retains only RESET - eliminating dual-output contention while preserving full watchdog and PFI/PFO functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±1.5% - ensures deterministic reset assertion during +5V supply brownout at industrial temperature range (–40°C to +85°C) |
| Reset Pulse Width | 200ms nominal - guarantees sufficient duration to fully initialize microcontrollers like Intel 80C51 requiring active-high reset |
| Watchdog Timeout | 1.6s ±40% - provides robust software hang detection without false triggers from short noise spikes (min. 50ns detectable) |
| PFI Threshold | 1.25V ±4% - enables accurate early-warning power-fail detection for +12V or negative rails using external resistor dividers |
| Supply Voltage Range | 1.2V to 5.5V - supports valid RESET operation during ultra-low-VCC brownout recovery, critical for battery-backed systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control, motor drives, and programmable logic controllers |
| Package | 8-pin SO (Small Outline) - RoHS-compliant, surface-mountable, footprint-compatible with industry-standard 150mil SOIC land pattern |
Pinout & Package
MAX813LESA+T is housed in an 8-pin SO (Small Outline) package with 150mil width, RoHS-compliant lead finish, and standard JEDEC MS-012AC outline. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internal 250μA pull-up ensures switch debounce and eliminates external components |
| 2 VCC | +5V Supply Input | Primary power rail; RESET remains valid down to 1.2V, enabling operation during deep brownout conditions |
| 3 GND | Ground Reference | Common return for all analog and digital functions; decoupling capacitor required between Pins 2 and 3 |
| 4 PFI | Power-Fail Input | Monitors external voltages via 1.25V comparator; connects to resistor divider for +12V or negative rail monitoring |
| 5 PFO | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V - used for NMI interrupt or backup-battery switchover |
| 6 WDI | Watchdog Input | Edge-triggered input; toggling within 1.6s prevents WDO assertion; floating disables watchdog (WDO = low only on VCC fault) |
| 7 RESET | Active-High Reset Output | Push-pull output; guaranteed logic high ≥VCC – 1.5V and low ≤0.3V at 100μA sink - directly interfaces with 80C51-style μPs |
| 8 WDO | Watchdog Output | Open-drain active-low output; goes low on timeout or VCC drop below 4.65V; no minimum pulse width - fast response to line faults |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1.2V | Enables fail-safe reset assertion during partial power recovery - critical for systems with asymmetric rail sequencing |
| 200ms reset pulse width with 40mV hysteresis | Prevents spurious resets during noisy supply transients while ensuring reliable μP initialization across temperature |
| 1.25V precision PFI threshold with nA-level input current | Permits high-impedance voltage monitoring without loading sensitive reference or battery circuits |
| Edge-sensitive 1.6s watchdog timer | Eliminates need for software timer polling; detects lockups even during low-power sleep modes with minimal current overhead |
| Debounced MR input with 250μA internal pull-up | Removes requirement for external RC network or Schmitt trigger - reduces BOM count and PCB area in space-constrained designs |
Applications
| Industrial Motor Control | Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Real-time motion control system powered by +5V DC with auxiliary +24V I/O rail and battery-backed RAM. IC Role / Device Role / Timing Role: Supervises +5V VCC for safe boot/reset; monitors +24V rail via PFI divider to preemptively trigger shutdown before undervoltage lockout. Use Value: Prevents erratic actuator movement during brownout by asserting RESET before logic corruption occurs - validated at –40°C to +85°C. |
Use Scenario: DIN-rail mounted PLC executing cyclic scan logic with watchdog-enforced task timing and nonvolatile memory retention. IC Role / Device Role / Timing Role: Generates active-high RESET for ARM Cortex-M7 core; uses WDI to verify main loop execution; PFO signals power-fail to initiate EEPROM save. Use Value: Guarantees deterministic restart after power interruption and detects firmware hangs - reducing field failure rate in unattended deployments. |
| Medical Diagnostic Equipment | Smart Energy Meter |
Use Scenario: Portable ultrasound unit with Li-ion battery, +3.3V/5V dual-rail power, and safety-critical FPGA configuration. IC Role / Device Role / Timing Role: Monitors main +5V rail and battery voltage via PFI; asserts RESET on VCC dip to prevent corrupted FPGA bitstream load. Use Value: Ensures FDA-compliant power-on self-test (POST) execution and eliminates risk of undefined state during battery swap. |
Use Scenario: ANSI C12.20-certified meter with tamper-detection circuitry, RTC backup, and isolated RS-485 communication. IC Role / Device Role / Timing Role: Provides watchdog supervision of metrology MCU; uses PFO to trigger supercapacitor switchover when AC mains fail. Use Value: Maintains timekeeping integrity and prevents data loss during grid outage - meets IEC 62053-21 backup duration requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707ESA+ | Same 4.65V reset threshold and –40°C to +85°C rating, but includes both active-high RESET and active-low RESET outputs | Required where legacy μP designs need simultaneous active-high and active-low reset signals (e.g., mixed-vendor SoC interfaces) | Select MAX707ESA+ only if dual-reset polarity is mandatory; MAX813LESA+T saves board space and simplifies routing with single RESET |
| MAX809SEUR+T | Single-function reset IC with 4.63V threshold, no watchdog, no PFI/PFO, and 140ms reset pulse width | Suitable for cost-sensitive applications needing only basic power-on reset without supervision or monitoring features | Choose MAX809SEUR+T for minimal BOM cost where watchdog, power-fail warning, and manual reset are unnecessary |
Compared with MAX707ESA+, MAX813LESA+T reduces pin count and layout complexity by omitting redundant RESET while retaining full watchdog and PFI functionality; versus MAX809SEUR+T, it adds critical system-level supervision at modest cost premium - making it optimal for industrial and medical embedded systems demanding reliability beyond basic reset.
Availability
MAX813LESA+T is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controllers, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX813LESA+T 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, automotive, and communications markets.
The MAX813L series was designed specifically for cost-sensitive, high-reliability microprocessor supervision in industrial control and embedded systems - emphasizing guaranteed reset timing, wide VCC operating range, and integrated watchdog/PFI functions in compact packages.
FAQ
What is the reset threshold voltage and tolerance for MAX813LESA+T?
The MAX813LESA+T has a nominal reset threshold of 4.65V with a guaranteed tolerance of ±1.5% over the full –40°C to +85°C operating temperature range. This value is specified in the Electrical Characteristics table under "Reset Threshold (VRT)" and applies to all MAX813L variants with 'E' grade temperature rating. The 40mV hysteresis prevents oscillation during slow supply ramps.
Does MAX813LESA+T provide both active-high and active-low reset outputs?
No. The MAX813LESA+T provides only an active-high RESET output (Pin 7). Unlike the MAX707/MAX708 family, it does not include an active-low RESET pin. This design choice reduces pin count and simplifies interface for microcontrollers such as the Intel 80C51 that require active-high reset signaling - confirmed in the Pin Description and Block Diagram sections of the datasheet.
What is the minimum supply voltage at which MAX813LESA+T guarantees valid RESET output?
The MAX813LESA+T guarantees valid RESET output down to VCC = 1.2V, with ISINK = 100μA and output voltage ≤0.3V. This specification is explicitly stated in the Electrical Characteristics table under "RESET Output Voltage" for MAX813LE/M grade devices and is critical for brownout recovery in battery-powered or multi-rail systems.
Can MAX813LESA+T monitor voltages other than +5V, and how is this implemented?
Yes. The MAX813LESA+T monitors external voltages via its PFI pin, which compares input against an internal 1.25V reference. To monitor +12V, for example, connect a resistor divider (e.g., 130kΩ/10kΩ) between +12V and GND, feeding the midpoint to PFI. When the divided voltage falls below 1.25V, PFO asserts - enabling early power-fail warning before main supply collapse.
What is the watchdog timeout period for MAX813LESA+T, and how is it cleared?
The MAX813LESA+T watchdog timeout period is 1.6 seconds ±40%. It is cleared by any rising or falling edge on the WDI pin, by assertion of RESET, or by placing WDI in high-impedance (three-state). Floating WDI disables the watchdog, causing WDO to remain low only during VCC faults - a behavior confirmed in the Detailed Description and Figure 1 block diagram.
MAX813LESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX813LESA+T FAQ
1.How can I place an order for MAX813LESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX813LESA+T 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 MAX813LESA+T reliable?
The price and inventory of MAX813LESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX813LESA+T is usually 5 days.
3.What payment methods are accepted for MAX813LESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX813LESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX813LESA+T?
MAX813LESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX813LESA+T 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 MAX813LESA+T?
For technical support, including MAX813LESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX813LESA+T requirements.
6.How does Aetrix verify that MAX813LESA+T is sourced from the original manufacturer or authorized distributors?
All MAX813LESA+T 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 MAX813LESA+T meets industry standards.
7.What is the process for return or replacement of MAX813LESA+T?
All MAX813LESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX813LESA+T, 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 MAX813LESA+T part is unused and in its original packaging.
Return procedure for MAX813LESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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