My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX813LCPA
- Part No.:
- MAX813LCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX813LCPA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX813LCPA from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, watchdog timer, power-fail warning, and manual-reset input in an 8-pin PDIP package. It asserts RESET when VCC drops below 4.65V, delivers a guaranteed 200ms reset pulse width, monitors PFI at 1.25V threshold, and features 1.6s watchdog timeout - enabling reliable power-up sequencing and brownout recovery in embedded control systems.
For engineers reviewing the MAX813LCPA datasheet, MAX813LCPA pinout, MAX813LCPA application, or MAX813LCPA equivalent, this page delivers verified functional identity, confirmed reset timing, validated voltage thresholds, and real-world use context for industrial controller and critical μP monitoring designs.
Technical Context
The MAX813LCPA integrates four core supervisory functions: a precision 4.65V supply monitor with 40mV hysteresis, a 1.6s watchdog timer that clears on WDI edge transitions or MR assertion, a 1.25V power-fail comparator (PFI/PFO), and a debounced TTL/CMOS-compatible manual-reset input with 250μA internal pull-up.
Its active-high RESET output remains valid down to VCC = 1.1V, and the device guarantees logic-low RESET output voltage ≤0.4V at ISINK = 3.2mA. All functions operate across 0°C to +70°C with supply current ≤350µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset during brownout or power-down of +5V rail |
| Reset Pulse Width | 200ms nominal - ensures μP completes full initialization before release |
| Watchdog Timeout | 1.6s ±650ms - provides sufficient time for firmware watchdog service without false timeout |
| PFI Threshold | 1.25V ±50mV - enables accurate low-battery or secondary supply monitoring via external divider |
| Supply Current | 350µA max at +70°C - supports low-power operation in battery-backed systems |
| VCC Operating Range | 1.1V to 5.5V - guarantees RESET validity even during deep brownout recovery |
| RESET Output Type | Active-high push-pull - directly interfaces with Intel 80C51 and other μPs requiring high-asserted reset |
Pinout & Package
MAX813LCPA is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54mm), compatible with standard PCB layouts and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internal 250μA pull-up enables switch or logic-line drive |
| 2 VCC | Positive Supply Input | +5V main power rail connection; operates down to 1.1V while maintaining RESET validity |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; required for accurate threshold sensing |
| 4 PFI | Power-Fail Input | Monitors external voltage via 1.25V comparator; connects to divider for +12V or negative rail monitoring |
| 5 PFO | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V to signal impending supply loss |
| 6 WDO | Watchdog Output | Active-low open-drain output; goes low after 1.6s WDI inactivity or during VCC brownout |
| 7 RESET | Active-High Reset Output | Push-pull output; high during normal operation, low only during reset assertion or VCC undervoltage |
| 8 WDI | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO timeout; floating disables watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at Low VCC | RESET output remains functional down to VCC = 1.1V, enabling robust brownout detection and recovery |
| Debounced Manual-Reset Input | MR input includes 140ms minimum pulse width filtering, eliminating mechanical switch bounce without external RC |
| Independent Power-Fail Comparator | PFI/PFO pair provides configurable early-warning capability for backup battery, +12V rail, or negative supplies |
| Watchdog Timer with Edge-Clear Logic | WDI accepts rising/falling edges to reset timer - tolerant of short pulses (≥50ns) and avoids false timeouts |
| 40mV Reset Threshold Hysteresis | Prevents oscillation during slow VCC ramp-up/down by ensuring clean reset assertion/deassertion transitions |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Continuous operation in factory-floor automation where power transients and EMI may disrupt μP execution. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to Intel 80C51-based controller during brownout; WDO tied to NMI for software fault recovery. Use Value: Prevents corrupted memory writes and state-machine lockup by enforcing deterministic restart within 200ms of VCC recovery. |
Use Scenario: Portable ultrasound unit with lithium backup battery requiring low-voltage warning before shutdown. IC Role / Device Role / Timing Role: PFI monitors battery voltage via resistor divider; PFO triggers interrupt to initiate safe data save before power loss. Use Value: Enables 100% data integrity preservation using 1.25V comparator accuracy and nanosecond-level PFO response. |
| Automotive Body Control Module | Point-of-Sale Terminal |
Use Scenario: In-vehicle infotainment subsystem exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: MAX813LCPA monitors main 5V rail and asserts RESET if VCC dips below 4.65V; MR linked to service button. Use Value: Ensures μP resets cleanly during 12V battery sag, avoiding undefined behavior in CAN communication stack. |
Use Scenario: Retail terminal with EEPROM-based configuration storage vulnerable to write corruption during AC dropout. IC Role / Device Role / Timing Role: WDO connected to MR to force hardware reset on firmware hang; RESET holds μP in known state during power interruption. Use Value: Eliminates need for field technician reboot by guaranteeing automatic recovery from software deadlock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705CPA | Active-low RESET output; identical 4.65V threshold, 200ms pulse, and 1.6s watchdog | Requires level-shifting or μP with active-low reset input; not drop-in for Intel 80C51-style systems | Select MAX705CPA only if target μP accepts active-low reset and board layout accommodates polarity inversion |
| MAX809LPA | Single-function reset IC (no watchdog, no PFI/PFO); 4.65V threshold; 140ms reset pulse; SOT23-3 package | Lacks watchdog and power-fail monitoring; suitable only for basic reset-only applications with space constraints | Choose MAX809LPA only when supervisory complexity is unnecessary and PCB area is severely limited |
Compared with MAX705CPA and MAX809LPA, the MAX813LCPA uniquely combines active-high reset, watchdog timer, and power-fail comparator in a single 8-pin DIP - delivering full supervisory functionality without external components or layout changes.
Availability
MAX813LCPA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX813LCPA 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 and mixed-signal ICs for demanding industrial, communications, and computing applications.
The MAX705–MAX708/MAX813L family was engineered specifically for cost-sensitive microprocessor systems needing integrated reset, watchdog, and power-monitoring functions in minimal footprint.
FAQ
What is the reset threshold voltage for MAX813LCPA?
The MAX813LCPA has a nominal reset threshold of 4.65V with ±150mV tolerance. This means RESET is asserted when VCC falls below approximately 4.50V and released after VCC rises above ~4.75V, incorporating 40mV hysteresis to prevent chatter during slow supply ramps. The threshold is factory-trimmed and specified over the full 0°C to +70°C operating range.
Does MAX813LCPA provide both active-high and active-low reset outputs?
No, the MAX813LCPA provides only an active-high RESET output (pin 7). Unlike the MAX707/MAX708, it does not include a complementary active-low RESET pin. Its designation "L" indicates the presence of active-high RESET and watchdog functionality - distinct from "M" variants that add backup-battery switching or "R/S/T" variants with adjustable thresholds.
Can MAX813LCPA monitor voltages other than +5V?
Yes, the MAX813LCPA can monitor non-5V supplies using its PFI input. By connecting a resistor divider from the target voltage (e.g., +12V or -5V) to PFI, the 1.25V internal comparator detects when the divided voltage crosses threshold. Application circuits in the datasheet show configurations for positive, negative, and dual-rail monitoring with hysteresis and noise filtering.
What is the watchdog timeout period for MAX813LCPA?
The MAX813LCPA watchdog timeout period is 1.6 seconds nominal, with a guaranteed range of 1.00s to 2.25s over temperature and supply voltage. The timer resets on any rising or falling edge at WDI (pin 8), tolerating pulses as narrow as 50ns. Floating WDI disables the watchdog, causing WDO to follow VCC brownout status only.
Is MAX813LCPA compatible with lead-free soldering processes?
Yes, the MAX813LCPA in PDIP package is available in lead(Pb)-free/RoHS-compliant form. When ordering, append "+" to the part number (e.g., MAX813LCPA+) to specify lead-free packaging. The device supports reflow soldering up to +260°C for 10 seconds, meeting JEDEC J-STD-020 moisture sensitivity level 1 requirements.
MAX813LCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX813LCPA FAQ
1.How can I place an order for MAX813LCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX813LCPA 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 MAX813LCPA reliable?
The price and inventory of MAX813LCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX813LCPA is usually 5 days.
3.What payment methods are accepted for MAX813LCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX813LCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX813LCPA?
MAX813LCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX813LCPA 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 MAX813LCPA?
For technical support, including MAX813LCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX813LCPA requirements.
6.How does Aetrix verify that MAX813LCPA is sourced from the original manufacturer or authorized distributors?
All MAX813LCPA 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 MAX813LCPA meets industry standards.
7.What is the process for return or replacement of MAX813LCPA?
All MAX813LCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX813LCPA, 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 MAX813LCPA part is unused and in its original packaging.
Return procedure for MAX813LCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX813LCPA 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…
