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Analog Devices Inc./Maxim Integrated MAX815TCSA-T
- Part No.:
- MAX815TCSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815TCSA-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX815TCSA-T from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitoring, and active-low reset output. It features ±1% worst-case reset threshold accuracy (3.03V), 200ms reset pulse width, 75µA max supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable/battery-powered equipment for reliable µP reset during brownout, power-up, and watchdog timeout events.
For engineers reviewing the MAX815TCSA-T datasheet, MAX815TCSA-T pinout, MAX815TCSA-T application, or MAX815TCSA-T equivalent, key selection criteria include its fixed 3.03V reset threshold, independent 1.56s watchdog timeout, PFI/PFO power-fail interface, manual reset input, and SO-8 package compatibility with +3.3V systems requiring stable undervoltage supervision.
Technical Context
The MAX815TCSA-T implements a dedicated watchdog timer with 1.56s timeout that resets on any WDI transition - distinct from the VCC-supervised reset generator. Its power-fail comparator monitors PFI against a 1.70V internal reference (confirmed for T-suffix parts), asserting open-drain PFO when voltage falls below threshold.
Reset assertion is controlled by both VCC crossing the 3.03V ±1% threshold and MR input logic low; the internal 200ms timer ensures minimum reset pulse width after threshold crossing or MR release. All outputs - RESET, WDO, PFO - are guaranteed functional down to VCC = 1V, with glitch immunity for transients ≤30µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - precisely targets +3.3V supply systems with tight brownout detection at 92% of nominal rail. |
| Watchdog Timeout | 1.56s - provides robust software execution monitoring without requiring µP clock dependency. |
| Supply Current | 75µA max - enables multi-year battery life in portable medical and instrumentation devices. |
| Reset Pulse Width | 200ms min - ensures reliable µP initialization across all operating temperatures and supply conditions. |
| VCC Operating Range | 1.0V to 5.5V - guarantees RESET output validity during deep brownout, supporting graceful shutdown sequencing. |
| Power-Fail Reference | 1.70V - enables early warning for +3.3V rails via external divider, with PFO sinking ≥1.2mA on fault. |
| Manual Reset Delay | 250ns MR-to-RESET propagation - supports fast, deterministic operator-initiated recovery. |
Pinout & Package
MAX815TCSA-T is housed in an 8-pin SO (Small Outline) package, surface-mount compatible with standard 1.27mm pitch PCB assembly. Pin 1 is marked with a dot or beveled edge; pin numbering follows standard counter-clockwise convention from the marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low CMOS input with 150µA internal pullup; triggers reset when pulled below 1.10V; accepts TTL/CMOS logic or switch-to-GND. |
| 2 (VCC) | Positive Supply Input | Primary power rail input; reset asserted when VCC < 3.03V; RESET remains valid down to 1.0V. |
| 3 (GND) | Ground Reference | System ground return for all internal comparators, timers, and output drivers. |
| 4 (PFI) | Power-Fail Input | Analog input referenced to 1.70V; monitors external voltage divider for early power-fail warning before VCC dropout. |
| 5 (PFO) | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 1.70V; connects to µP interrupt or external logic for orderly shutdown. |
| 6 (WDI) | Watchdog Input | CMOS input toggled by µP firmware; timeout occurs if no transition within 1.56s; resets timer on every edge. |
| 7 (WDO) | Watchdog Output | Open-drain output low during timeout or VCC reset; no minimum pulse width; connects to NMI or MR for forced reset. |
| 8 (RESET) | Reset Output | Active-low open-drain output; asserted during power-up, brownout, or MR activation; sinks ≥3.2mA at 0.4V. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures deterministic reset across temperature, voltage, and process variation in +3.3V systems. |
| Independent Watchdog Timer | 1.56s timeout with edge-triggered WDI eliminates reliance on µP clock stability and prevents stuck-loop masking. |
| Power-Fail Warning Interface | PFI/PFO pair with 1.70V reference enables configurable early-warning threshold for +3.3V rails without additional components. |
| Glitch-Immune Reset Comparator | Rejects negative VCC transients ≤30µs at 100mV overdrive, preventing spurious resets in noisy industrial environments. |
| Low-Line Operation Support | Guaranteed RESET functionality down to VCC = 1.0V enables controlled shutdown sequencing even during severe brownout. |
Applications
| Medical Portable Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered ECG or glucose meter operating on single-cell Li-ion with 2.7–4.2V range, requiring fail-safe reset during voltage sag. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M µP and driving PFO to trigger data save before shutdown. Use Value: 3.03V reset threshold aligns with 92% of 3.3V rail; 75µA quiescent current extends battery life >3 years in standby. |
Use Scenario: DIN-rail mounted PLC module powered from 24VDC converted to 3.3V, subject to field-induced transients and brownouts. IC Role / Device Role / Timing Role: Dual-role supervisor: VCC reset for µP boot integrity and PFI-based early warning for 24V input degradation. Use Value: 30µs glitch immunity prevents false resets; PFI 1.70V reference allows precise 22.5V early-warning threshold via resistor divider. |
| Handheld Test Instruments | Smart Energy Meters |
|
Use Scenario: Battery-backed multimeter with flash memory storing calibration data, needing reliable reset during cold-start or low-battery conditions. IC Role / Device Role / Timing Role: Primary reset source coordinating µP startup, EEPROM write-protection enable, and LCD controller initialization. Use Value: RESET valid to 1.0V ensures deterministic state capture during final battery discharge; MR pin enables factory calibration reset. |
Use Scenario: Revenue-grade meter with tamper detection, requiring secure boot and power-fail logging before capacitor-backed RAM loss. IC Role / Device Role / Timing Role: System supervisor triggering non-maskable interrupt (via PFO) and holding µP in reset (via RESET) during AC dropout. Use Value: WDO output connected to MR creates autonomous watchdog-initiated reset; 200ms pulse width satisfies IEC 62053-21 reset timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TCSA-T | No watchdog timer; includes LOW LINE output instead of WDI/WDO; identical 3.03V reset, 75µA supply, SO-8 package. | Suitable where early low-line warning (60mV above reset) is preferred over software execution monitoring. | Select MAX814TCSA-T when system requires brownout pre-warning but not watchdog functionality. |
| TPS3808G33DBVR | TI part with 3.3V reset threshold (±0.5%), 350ms delay, 2.9µA quiescent current, SOT-23-6 package; no PFI/PFO or watchdog. | Targeted at ultra-low-power applications where only basic reset supervision is needed and board space is constrained. | Choose TPS3808G33DBVR only if PFI monitoring, watchdog, and SO-8 footprint are unnecessary. |
Compared with MAX815TCSA-T, MAX814TCSA-T offers identical reset accuracy and power-fail capability but replaces watchdog supervision with low-line detection - making it ideal for simpler brownout-aware systems. TPS3808G33DBVR trades away PFI, WDI, and SO-8 compatibility for extreme low-power operation in space-constrained designs.
Availability
MAX815TCSA-T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, handheld test instruments, and smart energy meters requiring stable component supply with long-term lifecycle support.
Supply support for MAX815TCSA-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, medical, and communications applications.
The MAX814/MAX815/MAX816 family was designed specifically for high-accuracy, low-power microprocessor supervision in battery-operated and mission-critical systems where deterministic reset behavior under brownout and transient conditions is essential.
FAQ
What is the exact reset threshold voltage of the MAX815TCSA-T?
The MAX815TCSA-T has a factory-trimmed reset threshold of 3.03V with ±1% worst-case accuracy across temperature and supply voltage. This value is confirmed in the Electrical Characteristics table for +3V Parts and applies specifically to the T-suffix variant. The threshold remains stable over the full operating temperature range (0°C to +70°C for the CS grade) and supports reliable brownout detection in +3.3V systems.
Does the MAX815TCSA-T include a watchdog timer, and how does it operate?
Yes, the MAX815TCSA-T integrates an independent watchdog timer with a fixed 1.56s timeout period. It monitors the WDI pin for transitions - each rising or falling edge resets the timer. If no transition occurs within 1.56s, WDO asserts low. Unlike the main reset generator, the watchdog operates independently of VCC level and has no minimum pulse width, enabling flexible connection to µP NMI or MR inputs for autonomous recovery.
Can the MAX815TCSA-T monitor power supplies other than VCC?
Yes, the MAX815TCSA-T can monitor external voltages using the PFI pin. With its fixed 1.70V internal reference, PFI accepts a voltage divider from any monitored rail (e.g., +12V, +5V, or negative supplies). When the divided voltage drops below 1.70V, PFO pulls low to signal impending failure. This capability is explicitly documented for MAX815T and enables early-warning functionality without additional comparators.
What is the function of the MR pin on the MAX815TCSA-T, and how should it be used?
The MR (Manual Reset) pin on the MAX815TCSA-T is an active-low input that forces RESET assertion when pulled below 1.10V. It features a 150µA internal pullup, allowing direct connection to a momentary switch (to GND) without external components. MR can also accept CMOS/TTL logic levels or open-drain signals. Release of MR initiates a 200ms reset pulse, ensuring µP initialization regardless of VCC state.
Is the MAX815TCSA-T compatible with 1.8V or 2.5V microcontrollers?
The MAX815TCSA-T itself operates from VCC = 1.0V to 5.5V and guarantees RESET output validity down to 1.0V, but its 3.03V reset threshold is optimized for +3.3V systems. For 1.8V or 2.5V µPs, the device can still supervise the 3.3V supply rail that powers the µP's I/O or auxiliary circuits - however, direct VCC supervision of sub-3V cores requires a different supervisory IC with matching threshold (e.g., MAX809R for 1.8V).
MAX815TCSA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.03V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX815TCSA-T FAQ
1.How can I place an order for MAX815TCSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815TCSA-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 MAX815TCSA-T reliable?
The price and inventory of MAX815TCSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815TCSA-T is usually 5 days.
3.What payment methods are accepted for MAX815TCSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815TCSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815TCSA-T?
MAX815TCSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815TCSA-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 MAX815TCSA-T?
For technical support, including MAX815TCSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815TCSA-T requirements.
6.How does Aetrix verify that MAX815TCSA-T is sourced from the original manufacturer or authorized distributors?
All MAX815TCSA-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 MAX815TCSA-T meets industry standards.
7.What is the process for return or replacement of MAX815TCSA-T?
All MAX815TCSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX815TCSA-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 MAX815TCSA-T part is unused and in its original packaging.
Return procedure for MAX815TCSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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