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Analog Devices Inc./Maxim Integrated MAX815KCSA+T
- Part No.:
- MAX815KCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815KCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,102
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Product details
Overview
MAX815KCSA+T from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitoring, and manual reset functionality. It features a 4.8V ±1% reset threshold, 200ms reset pulse width, 75µA max supply current, and guaranteed RESET validity down to VCC = 1V - designed for reliable power-on reset and brownout protection in +5V embedded systems such as medical instrumentation and portable controllers.
For engineers reviewing the MAX815KCSA+T datasheet, MAX815KCSA+T pinout, MAX815KCSA+T application, or MAX815KCSA+T equivalent, key selection criteria include its fixed 4.8V reset threshold, independent watchdog timeout (1.56s), active-low RESET output, PFI/PFO power-fail interface, and SO-8 package compatibility with legacy µP reset architectures.
Technical Context
The MAX815KCSA+T implements a dedicated watchdog timer with transition detection on WDI, generating a 1.56s timeout that forces WDO low upon expiration or VCC reset assertion. Its reset comparator operates with ±1% accuracy over temperature and line/load variations, ignoring transients ≤30µs at 100mV overdrive.
Power-fail monitoring uses a separate 2.50V reference (K/L/N suffix) on PFI to trigger open-drain PFO low when input falls below threshold; the LOW LINE function is absent (exclusive to MAX814), and adjustable reset (MAX816) is not supported.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - ensures deterministic reset initiation across temperature and supply tolerance in +5V systems with ≥±4% regulation. |
| Watchdog Timeout | 1.56 seconds - provides sufficient window for firmware recovery while preventing indefinite hang states in safety-critical applications. |
| Reset Pulse Width | 200ms minimum - guarantees full µP initialization and clock stabilization before release from reset. |
| Supply Current | 75µA max - enables use in battery-powered equipment with multi-year standby life. |
| VCC Operating Range | 4.85V to 5.5V - supports nominal +5V rails with headroom for ripple and transient margins. |
| RESET Validity | Down to VCC = 1V - maintains defined logic state during deep brownout, avoiding floating reset lines. |
| Power-Fail Reference | 2.50V - enables early warning of +5V rail collapse via external resistive divider on PFI. |
Pinout & Package
MAX815KCSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS-compatible input with 150µA internal pullup; triggers reset when pulled below 1.10V. |
| 2 VCC | Positive Supply | +5V power input; reset asserted when voltage falls below 4.80V ±1%, valid down to 1V. |
| 3 GND | Ground Reference | System ground return for all internal comparators and outputs. |
| 4 PFI | Power-Fail Input | High-impedance input referenced to 2.50V; used with external divider to monitor auxiliary rails. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 2.50V - signals impending supply failure to µP interrupt. |
| 6 WDI | Watchdog Input | CMOS-level input detecting transitions; timeout occurs if static for >1.56s. |
| 7 RESET | Reset Output | Active-low open-drain output; held low for ≥200ms after VCC rise above threshold or MR deassertion. |
| 8 WDO | Watchdog Output | Active-low open-drain output; goes low on watchdog timeout or VCC reset - no minimum pulse width. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures consistent reset behavior across temperature, voltage, and process variation. |
| Independent watchdog with 1.56s timeout | Provides autonomous software fault detection without relying on reset comparator or VCC monitoring. |
| 75µA max supply current | Enables integration into energy-constrained portable devices without compromising battery life. |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP state during deep undervoltage conditions by maintaining known logic level. |
| Power-supply glitch immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - avoids spurious resets in noisy environments. |
Applications
| Medical Instrumentation | Industrial Controllers |
|---|---|
Use Scenario: Portable ECG monitors requiring fail-safe boot sequence and runtime watchdog supervision under variable battery voltage. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and software hang recovery via WDI/WDO. Use Value: Prevents corrupted data acquisition during low-battery operation and ensures deterministic recovery from firmware faults. | Use Scenario: PLC I/O modules operating in electrically noisy factory environments with fluctuating 5V supplies. IC Role / Device Role / Timing Role: System-level reset manager asserting RESET on VCC dip and signaling early power degradation via PFO interrupt. Use Value: Enables graceful shutdown and nonvolatile memory save before supply collapse, improving system reliability. |
| Set-Top Box Power Management | Battery-Powered Test Equipment |
Use Scenario: Consumer STB with fast wake-from-standby and robust response to AC adapter dropout. IC Role / Device Role / Timing Role: Dual-role supervisor handling both cold-start reset and real-time power-fail warning using PFI/PFO. Use Value: Reduces boot latency after power restoration and prevents corrupted firmware updates during brownout. | Use Scenario: Handheld multimeter with lithium coin-cell backup and long-term storage requirements. IC Role / Device Role / Timing Role: Ultra-low-quiescent supervisor ensuring µP remains held in reset until stable 5V rail is established. Use Value: Extends shelf life by minimizing leakage current while guaranteeing safe startup at end-of-battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814KCSA+T | No watchdog timer; includes LOW LINE output instead of WDI/WDO; same 4.8V reset threshold and PFI/PFO functions. | Suitable for systems needing early low-voltage warning but no software execution monitoring. | Select MAX814KCSA+T when watchdog functionality is unnecessary and low-line NMI signaling is required. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; no PFI/PFO; no watchdog; 1.8–6.0V supply range; 1.6µA quiescent current. | Targeted at low-voltage, ultra-low-power applications where power-fail monitoring is omitted. | Choose TPS3808G33DBVR only for 3.3V-only systems without watchdog or auxiliary rail monitoring needs. |
Compared with MAX815KCSA+T, MAX814KCSA+T removes watchdog capability but adds low-line detection for predictive brownout response, while TPS3808G33DBVR trades PFI/PFO and watchdog for extreme low-power operation at a different voltage point - making MAX815KCSA+T uniquely suited for +5V systems requiring integrated fault coverage.
Availability
MAX815KCSA+T is available at Aetrix Electronics and suitable for medical instrumentation, industrial controllers, set-top boxes, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX815KCSA+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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX814/MAX815/MAX816 family delivers high-accuracy, low-power µP supervision with configurable reset thresholds, watchdog timers, and power-fail interfaces - engineered for reliability in critical embedded systems.
FAQ
What is the reset threshold voltage of the MAX815KCSA+T?
The MAX815KCSA+T has a factory-set reset threshold of 4.80V ±1%, optimized for +5V systems with ±4% supply tolerance. This value is fixed by the 'K' suffix and verified across temperature and load conditions per the datasheet's Electrical Characteristics table for +5V parts.
Does the MAX815KCSA+T include a watchdog timer?
Yes, the MAX815KCSA+T integrates an independent watchdog timer with a nominal timeout period of 1.56 seconds. It monitors the WDI pin for transitions and asserts WDO low upon timeout or during VCC reset - a feature absent in the MAX814 and MAX816 variants.
What package type is used for the MAX815KCSA+T?
The MAX815KCSA+T is supplied in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with JEDEC MS-012AC footprint and 1.27mm pin pitch - identical to industry-standard SOIC-8 layouts.
Can the MAX815KCSA+T monitor voltages other than VCC?
Yes, the MAX815KCSA+T can monitor auxiliary rails using the PFI pin with an external resistive divider. The internal 2.50V reference allows detection of falling +12V, +3.3V, or negative supplies - as demonstrated in Figure 11 and Figure 12 of the datasheet.
Is the RESET output of the MAX815KCSA+T active-high or active-low?
The MAX815KCSA+T provides an active-low RESET output (pin 7), open-drain configured to sink ≥3.2mA. It does not offer an active-high RESET output - that function is exclusive to the MAX814 and MAX816 variants.
MAX815KCSA+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:
- 4.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX815KCSA+T FAQ
1.How can I place an order for MAX815KCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815KCSA+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 MAX815KCSA+T reliable?
The price and inventory of MAX815KCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815KCSA+T is usually 5 days.
3.What payment methods are accepted for MAX815KCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815KCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815KCSA+T?
MAX815KCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815KCSA+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 MAX815KCSA+T?
For technical support, including MAX815KCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815KCSA+T requirements.
6.How does Aetrix verify that MAX815KCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX815KCSA+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 MAX815KCSA+T meets industry standards.
7.What is the process for return or replacement of MAX815KCSA+T?
All MAX815KCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX815KCSA+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 MAX815KCSA+T part is unused and in its original packaging.
Return procedure for MAX815KCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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