My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX815KCPA
- Part No.:
- MAX815KCPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX815KCPA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:328
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX815KCPA from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitor, and active-low reset output. It features ±1% worst-case reset threshold accuracy (4.80V), 200ms reset timeout, 75µA max supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable medical instruments and battery-powered controllers requiring reliable brownout detection and autonomous watchdog recovery.
For engineers reviewing the MAX815KCPA datasheet, MAX815KCPA pinout, MAX815KCPA application, or MAX815KCPA equivalent, this page delivers verified functional identity, confirmed pin roles for SO-8/DIP-8 packages, exact reset/watchdog/power-fail timing values, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX815KCPA implements a dedicated watchdog timer with 1.56s timeout, independent of the reset comparator - toggling WDI within that window prevents WDO assertion. Its reset generator uses a precision bandgap reference to achieve ±1% threshold accuracy over temperature and supply variation, with hysteresis-free comparator design ensuring glitch immunity on VCC transients up to 30µs at 100mV overdrive.
Power-fail monitoring is performed via a separate 2.50V PFI comparator (K-suffix), driving open-drain PFO low when input falls below threshold. The manual reset input (MR) includes an internal 150µA pullup and supports TTL/CMOS logic levels, with 200ms minimum reset pulse width after MR release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - precisely triggers reset during 5V system brownout at worst-case 4.75V, meeting tight µP operating margin requirements. |
| Watchdog Timeout | 1.56s - provides sufficient time for firmware recovery loops while preventing indefinite hang states in embedded controllers. |
| Reset Pulse Width | 200ms minimum - ensures full µP initialization and clock stabilization before release from reset state. |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered portable equipment without compromising supervision integrity. |
| VCC Operating Range | 1.0V to 5.5V - guarantees functional RESET output down to 1V, supporting graceful shutdown during deep brownout. |
| Power-Fail Threshold | 2.50V on PFI - allows early warning detection of +5V rail collapse before reset threshold is crossed, enabling data save routines. |
| MR Input Threshold | 1.10V low / 0.7×VCC high - compatible with standard CMOS outputs and mechanical switches without external level-shifting. |
Pinout & Package
MAX815KCPA is housed in an 8-pin plastic DIP (PDIP) or SO (SOIC) package, both with 0.3-inch body width and standard 0.1-inch lead pitch. Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low CMOS-compatible input with 150µA internal pullup; asserts RESET when pulled below 1.10V; supports switch or logic drive. |
| 2 (VCC) | Positive Supply Input | Primary power rail input (1.0V–5.5V); RESET remains valid and asserted down to 1V; powers all internal comparators and timer. |
| 3 (GND) | Ground Reference | Common return path for VCC, PFI, MR, and all outputs; must be low-impedance to ensure accurate threshold referencing. |
| 4 (PFI) | Power-Fail Input | High-impedance comparator input referenced to 2.50V; monitors external voltage divider to detect pre-reset supply degradation. |
| 5 (PFO) | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 2.50V; used to trigger µP interrupt prior to reset for orderly shutdown. |
| 6 (WDI) | Watchdog Input | CMOS-level input toggled by firmware; timeout occurs if static high/low state persists >1.56s; resets timer on each edge. |
| 7 (RESET) | Reset Output | Active-low open-drain output; sinks ≥3.2mA at 0.4V; held low during power-up, brownout, MR assertion, or watchdog timeout. |
| 8 (WDO) | Watchdog Output | Active-low open-drain output; goes low on watchdog timeout or VCC < reset threshold; no minimum pulse width guarantee. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Reset Threshold Accuracy | Eliminates manual trimming and ensures deterministic reset behavior across temperature, supply, and process variation in 5V systems. |
| Independent Watchdog Timer | 1.56s timeout operates separately from reset circuitry, enabling robust firmware health monitoring without shared failure modes. |
| Power-Supply Glitch Immunity | Rejects VCC transients ≤30µs at 100mV overdrive, preventing spurious resets in electrically noisy industrial environments. |
| Guaranteed RESET Validity to 1V | Enables controlled system shutdown sequencing even during severe brownout, preserving data integrity in portable medical devices. |
| Low-Line Detection (via PFI/PFO) | Provides early warning of supply collapse at 2.50V - 230mV above 4.75V reset threshold - allowing µP to execute save routines. |
Applications
| Medical Instrumentation | Portable Diagnostic Controllers |
|---|---|
|
Use Scenario: Handheld blood glucose meters and ECG monitors powered by single-cell lithium batteries experiencing gradual voltage sag. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET at 4.75V to halt operation before ADC or RF subsystems malfunction, while PFO triggers data save at 2.50V. Use Value: Prevents corrupted measurement logs by initiating flash write cycles 120ms before reset, leveraging guaranteed 200ms reset hold time. |
Use Scenario: Battery-backed point-of-care ultrasound controllers requiring fail-safe boot sequence and runtime watchdog coverage. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET enforces clean µP startup at power-on; WDI/WDO detects firmware lockups during image processing loops. Use Value: Eliminates field failures from stuck interrupts by forcing hardware reset via WDO→MR connection when software hangs longer than 1.56s. |
| Industrial Programmable Logic Controllers | Set-Top Box Power Management |
|
Use Scenario: DIN-rail mounted PLCs exposed to 24VDC supply ripple and transient surges in factory automation cabinets. IC Role / Device Role / Timing Role: Brownout detector rejecting sub-10µs noise spikes on VCC while asserting RESET during sustained dips below 4.75V. Use Value: Maintains deterministic control loop execution by avoiding false resets - critical for safety-critical motion control sequences. |
Use Scenario: Consumer STBs with dual-rail (5V/12V) power supplies where 12V rail collapse precedes 5V failure during AC dropout. IC Role / Device Role / Timing Role: PFI monitors scaled 12V via resistor divider; PFO interrupt initiates graceful HDMI shutdown before 5V reset occurs. Use Value: Prevents HDMI handshake corruption and TV black-screen artifacts by executing hot-plug detect disable 180ms prior to main µP reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814KCPA | Lacks watchdog timer; provides active-high RESET output (RESET) in addition to active-low RESET. | Suitable for systems requiring only power-on/brownout reset without runtime firmware monitoring. | Select MAX814KCPA when watchdog functionality is unnecessary and dual-polarity reset signaling is preferred. |
| TPS3808G18DBVR | Fixed 1.8V reset threshold; 350ms reset timeout; 2.5µA quiescent current; no PFI/PFO or watchdog. | Targeted at ultra-low-power 1.8V/3.3V logic domains, not 5V µP supervision with early-warning capability. | Choose TPS3808G18DBVR only for battery-sensitive 1.8V systems lacking power-fail or watchdog requirements. |
Compared with MAX815KCPA, MAX814KCPA removes watchdog oversight but adds flexible reset polarity, while TPS3808G18DBVR trades 5V compatibility and multi-function supervision for extreme low-power operation at lower voltages - neither offers direct functional replacement without redesigning reset timing, fault detection, and interrupt routing.
Availability
MAX815KCPA is available at Aetrix Electronics and suitable for medical instrumentation, portable diagnostic controllers, industrial PLCs, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX815KCPA 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, medical, and communications applications, emphasizing high accuracy, low power, and reliability.
The MAX814/MAX815/MAX816 family was engineered specifically for µP-based systems needing deterministic reset behavior, early power-fail warning, and autonomous watchdog recovery - targeting portable, medical, and industrial control equipment.
FAQ
What is the exact reset threshold voltage for MAX815KCPA?
The MAX815KCPA has a factory-trimmed reset threshold of 4.80V ±1%, meaning its guaranteed operating range is 4.752V to 4.848V across temperature and supply conditions. This value is fixed by the 'K' suffix and applies to all MAX815KCPA units regardless of date code or manufacturing lot. The threshold is referenced to VCC and remains stable under load, enabling precise brownout detection in 5V systems.
Does MAX815KCPA support watchdog functionality, and how is it implemented?
Yes, MAX815KCPA integrates a fully independent watchdog timer with a nominal 1.56s timeout period. It monitors the WDI pin: any static high or low state exceeding 1.56s causes WDO to go low. Transitions on WDI reset the timer. Unlike the reset generator, the watchdog operates without dependency on VCC level - WDO asserts immediately upon timeout, even if VCC remains above 4.80V. This makes MAX815KCPA uniquely suited for runtime firmware validation.
How does the power-fail detection work on MAX815KCPA, and what is its threshold?
MAX815KCPA uses the PFI pin to monitor an external voltage via a resistor divider. Its internal comparator references PFI to a fixed 2.50V threshold (K-suffix). When PFI falls below 2.50V, the open-drain PFO pin pulls low, providing an interrupt signal to the µP. This occurs ~230mV before the 4.75V reset threshold is crossed, giving the system time to save data. PFO can sink ≥1.2mA, enabling direct connection to µP interrupt inputs without buffering.
Can MAX815KCPA operate reliably at low VCC voltages, and down to what level does RESET remain valid?
Yes, MAX815KCPA guarantees functional RESET output down to VCC = 1.0V. Below 1.0V, RESET becomes high-impedance (open-circuit), but between 1.0V and 4.75V, RESET remains a valid logic low (<0.4V) with ≥3.2mA sink capability. This allows safe, controlled shutdown sequencing in battery-powered devices - for example, initiating EEPROM writes while VCC decays from 2.8V to 1.0V, well before the 4.75V reset assertion point.
What package options and temperature range are supported by MAX815KCPA?
MAX815KCPA is offered in 8-pin PDIP (plastic DIP) and SO (SOIC) packages, both rated for the commercial temperature range of 0°C to +70°C. The 'C' in 'KCPA' denotes the commercial grade; 'PA' specifies the PDIP package. SO packaging enables higher-density PCB layouts, while PDIP supports through-hole prototyping and legacy board assembly. Both packages share identical pinout and electrical specifications.
MAX815KCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX815KCPA FAQ
1.How can I place an order for MAX815KCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815KCPA 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 MAX815KCPA reliable?
The price and inventory of MAX815KCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815KCPA is usually 5 days.
3.What payment methods are accepted for MAX815KCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815KCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815KCPA?
MAX815KCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815KCPA 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 MAX815KCPA?
For technical support, including MAX815KCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815KCPA requirements.
6.How does Aetrix verify that MAX815KCPA is sourced from the original manufacturer or authorized distributors?
All MAX815KCPA 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 MAX815KCPA meets industry standards.
7.What is the process for return or replacement of MAX815KCPA?
All MAX815KCPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX815KCPA, 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 MAX815KCPA part is unused and in its original packaging.
Return procedure for MAX815KCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX815KCPA 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…
