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Analog Devices Inc./Maxim Integrated MAX813LCSA+T
- Part No.:
- MAX813LCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX813LCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
MAX813LCSA+T from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, watchdog timer, power-fail comparator, and manual-reset input in an 8-pin SO package. It asserts RESET when VCC drops below 4.65V, delivers 200ms reset pulse width, monitors external supplies via 1.25V PFI threshold, and features guaranteed RESET validity down to VCC = 1.1V. It is used in embedded controllers requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX813LCSA+T datasheet, MAX813LCSA+T pinout, MAX813LCSA+T application, or MAX813LCSA+T equivalent, this page delivers verified functional identity, confirmed SO-8 pin mapping, exact reset threshold (4.65V), watchdog timeout (1.6s), and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX813L integrates four core supervisory functions on a single die: a precision voltage monitor with 4.65V reset threshold and 40mV hysteresis, a 1.6s watchdog timer with edge-sensitive WDI input, a 1.25V reference-based power-fail comparator (PFI/PFO), and a debounced TTL/CMOS-compatible manual-reset input (MR) with 250μA internal pull-up.
Its active-high RESET output is valid down to VCC = 1.1V, enabling robust reset assertion during deep brownout. The device operates across 1.1V–5.5V supply range and draws only 150–350μA typical quiescent current, making it suitable for low-power industrial and embedded systems where supply stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±1.5% - triggers reset when +5V rail falls below nominal operating level, ensuring μP remains held until stable supply is restored. |
| Reset Pulse Width | 200ms minimum - guarantees sufficient duration to fully initialize microprocessors such as Intel 80C51 requiring active-high reset. |
| Watchdog Timeout | 1.6s ±40% - provides deterministic time window for firmware to service watchdog, preventing runaway code execution. |
| PFI Threshold | 1.25V ±4% - enables accurate power-fail warning or low-battery detection when used with external resistor divider. |
| Supply Voltage Range | 1.1V to 5.5V - supports operation during severe brownout and ensures RESET remains valid even as VCC collapses. |
| Quiescent Current | 150–350μA at VCC = 4.75–5.5V - minimizes standby power draw in battery-backed or energy-constrained systems. |
| Operating Temperature | 0°C to +70°C - rated for commercial-grade industrial control and computing applications without extended thermal stress. |
Pinout & Package
MAX813LCSA+T is housed in an 8-pin Small Outline (SO) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and JEDEC MS-012AC outline. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible input; internally pulled up with 250μA; debounces pushbutton switches with ≥140ms minimum pulse width. |
| 2 VCC | Positive Supply Input | +5V main supply connection; device operates from 1.1V to 5.5V; RESET remains valid down to 1.1V. |
| 3 GND | Ground Reference | 0V return path for all analog and digital circuitry; must be low-impedance for accurate voltage monitoring. |
| 4 PFI | Power-Fail Input | Noninverting input of comparator referenced to 1.25V; used to monitor auxiliary supplies or battery voltage via external divider. |
| 5 PFO | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; can interrupt μP or trigger backup actions. |
| 6 WDO | Watchdog Output | Open-drain active-low output; goes low after 1.6s watchdog timeout or during VCC brownout; no minimum pulse width. |
| 7 RESET | Active-High Reset Output | Push-pull output; high when VCC > 4.65V and stable; low during power-up, brownout, or MR assertion; valid to 1.1V. |
| 8 WDI | Watchdog Input | Edge-triggered input; rising or falling edge clears watchdog timer; floating or high-Z disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at Low VCC | RESET output remains functional down to VCC = 1.1V, enabling reliable reset assertion during deep undervoltage conditions. |
| Integrated Power-Fail Comparator | 1.25V precision reference allows flexible monitoring of non-5V rails (e.g., +12V, battery, negative supplies) using external resistive dividers. |
| Debounced Manual-Reset Input | 250μA internal pull-up and 140ms minimum reset pulse eliminate need for external RC debounce circuitry. |
| Watchdog Timer with Edge Sensitivity | WDI detects pulses as short as 50ns; timer clears on any edge, supporting both periodic and event-driven firmware supervision. |
| Low Quiescent Current | 150–350μA typical supply current reduces system-level standby power, critical for battery-operated instrumentation. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Programmable logic controller operating in factory environments with fluctuating 24V DC input converted to +5V. IC Role / Device Role / Timing Role: Supervises +5V rail integrity, asserts RESET during brownout, and triggers orderly shutdown via PFO interrupt upon early power-fail detection. Use Value: Prevents corrupted I/O state and firmware lockup by guaranteeing 200ms reset pulse and enabling pre-failure data save via PFI monitoring. |
Use Scenario: Portable ultrasound unit powered by Li-ion battery with dual regulated outputs (+5V and +3.3V). IC Role / Device Role / Timing Role: Monitors battery voltage via PFI divider, asserts RESET if cell voltage drops below safe threshold, and provides watchdog supervision of real-time image processing firmware. Use Value: Ensures deterministic system restart before battery depletion causes memory corruption, leveraging 1.1V RESET validity and 1.25V PFI reference accuracy. |
| Communications Baseband Processor | Smart Energy Meter |
Use Scenario: LTE baseband SoC requiring precise power sequencing and fault recovery in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Generates active-high RESET compatible with ARM Cortex-M reset inputs, monitors +5V supply with 4.65V threshold, and uses WDI/WDO to supervise boot loader execution. Use Value: Eliminates need for discrete reset IC + watchdog + comparator, reducing BOM count while maintaining 1.6s firmware supervision window. |
Use Scenario: ANSI C12.22-compliant meter with backup supercapacitor and tamper-detection logic. IC Role / Device Role / Timing Role: Detects main AC loss via PFI divider, asserts RESET to halt计量 operations, and uses MR to initiate secure shutdown on physical tamper event. Use Value: Meets IEC 62056-21 requirements for controlled power-down by combining 200ms reset hold time with debounced MR input and PFO interrupt capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705CSA+ | Active-low RESET output; identical 4.65V threshold, 1.6s watchdog, and SO-8 package; lacks RESET output. | Requires μP with active-low reset input (e.g., many ARM Cortex-M variants); not suitable for Intel 80C51-family devices needing active-high reset. | Select MAX705CSA+ only if target microprocessor accepts active-low reset and no complementary RESET signal is needed. |
| MAX809LTR | Single-function reset IC; 4.63V threshold, 140ms reset pulse, SOT23-3 package; no watchdog, PFI/PFO, or MR. | Only provides basic power-on reset; cannot replace full supervisory functionality of MAX813LCSA+T in systems requiring brownout recovery or firmware supervision. | Choose MAX809LTR only for cost-sensitive, space-constrained designs where only power-up reset is required and watchdog/PFI are omitted. |
Compared with MAX705CSA+, MAX813LCSA+T adds active-high RESET output essential for legacy μPs, while MAX809LTR sacrifices all advanced supervision features for minimal footprint and cost-making MAX813LCSA+T the only option supporting full four-function supervision in SO-8.
Availability
MAX813LCSA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, communications baseband processors, and smart energy meters requiring stable component supply across commercial temperature range and long-term production continuity.
Supply support for MAX813LCSA+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) designs precision analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX813L belongs to Maxim's μP supervisory product line, engineered specifically to consolidate reset generation, watchdog supervision, power-fail warning, and manual reset into a single low-power, small-outline solution for embedded microprocessor systems.
FAQ
What is the reset threshold voltage for MAX813LCSA+T?
The MAX813LCSA+T has a nominal reset threshold of 4.65V with ±1.5% tolerance. This means RESET is asserted when VCC falls below approximately 4.58V and released after VCC rises above ~4.72V, with 40mV hysteresis to prevent chatter near the trip point. This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VRT)" for MAX813L devices.
Does MAX813LCSA+T provide both active-high and active-low reset outputs?
No, MAX813LCSA+T provides only an active-high RESET output (pin 7). Unlike the MAX707/MAX708, it does not include a complementary active-low RESET output. The MAX813L datasheet explicitly states "The MAX813L has a RESET output only," confirming that pin 7 is the sole reset signal and no second reset output is present on this variant.
What is the minimum supply voltage at which MAX813LCSA+T guarantees valid RESET output?
MAX813LCSA+T guarantees valid RESET output down to VCC = 1.1V. This is specified in the Electrical Characteristics table under "RESET Output Voltage" for MAX813LC, with test condition VCC = 1.1V and ISOURCE = 4μA. This feature ensures reliable reset assertion during deep brownout conditions before the supply collapses completely.
Can MAX813LCSA+T monitor a +12V supply for power-fail detection?
Yes, MAX813LCSA+T can monitor a +12V supply using its PFI input. By connecting a resistor divider between +12V and GND, the voltage at PFI is scaled to fall below the 1.25V threshold when the +12V rail degrades. Figure 6 in the datasheet shows exactly this configuration, achieving a +12V reset threshold of 10.67–11.50V depending on resistor tolerance.
What package type and RoHS status does MAX813LCSA+T use?
MAX813LCSA+T uses an 8-pin Small Outline (SO) package, outlined in JEDEC MS-012AC, with 1.27mm lead pitch. The "+" suffix in the part number indicates RoHS-compliant, lead-free construction per Maxim's ordering convention, confirmed in the "Ordering Information" and "Package Information" sections of the datasheet.
MAX813LCSA+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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX813LCSA+T FAQ
1.How can I place an order for MAX813LCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX813LCSA+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 MAX813LCSA+T reliable?
The price and inventory of MAX813LCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX813LCSA+T is usually 5 days.
3.What payment methods are accepted for MAX813LCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX813LCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX813LCSA+T?
MAX813LCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX813LCSA+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 MAX813LCSA+T?
For technical support, including MAX813LCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX813LCSA+T requirements.
6.How does Aetrix verify that MAX813LCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX813LCSA+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 MAX813LCSA+T meets industry standards.
7.What is the process for return or replacement of MAX813LCSA+T?
All MAX813LCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX813LCSA+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 MAX813LCSA+T part is unused and in its original packaging.
Return procedure for MAX813LCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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