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Analog Devices Inc./Maxim Integrated MAX815TCSA
- Part No.:
- MAX815TCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815TCSA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:905
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Product details
Overview
MAX815TCSA from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitor, and manual reset input. It provides active-low RESET output, 200ms reset timeout, 75µA max supply current, and guaranteed RESET validity down to VCC = 1V. It is designed for reliable power monitoring in battery-powered portable equipment operating from 3.06V to 5.5V supplies.
For engineers reviewing the MAX815TCSA datasheet, MAX815TCSA pinout, MAX815TCSA application, or MAX815TCSA equivalent, this device serves as a precision voltage supervisor with independent watchdog timeout (1.56s), glitch-immune reset assertion, and configurable power-fail warning-critical for medical instruments, intelligent controllers, and set-top boxes requiring deterministic startup and brownout recovery.
Technical Context
The MAX815TCSA implements a dedicated watchdog timer with 1.56s timeout triggered by WDI transitions; it asserts WDO low on timeout or during VCC reset conditions. Its reset comparator ignores transients ≤30µs at 100mV overdrive, ensuring immunity to supply noise.
It features a 1.70V PFI threshold (for +3V operation), 3.03V fixed reset threshold (T-suffix), ±1% worst-case accuracy across temperature, and operates from 1.2V to 5.5V-enabling valid reset signaling even during deep brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - precisely triggers reset when VCC falls below system's 3.3V supply tolerance limit (3.33V ±0.26V). |
| Watchdog Timeout | 1.56s - ensures µP software hangs longer than this duration force a hardware reset via WDO→MR feedback. |
| Supply Current | 75µA max - enables multi-year battery life in portable medical or handheld instrumentation. |
| RESET Validity Range | VCC ≥ 1V - guarantees active-low RESET remains logic-low and sink-capable down to near-dead-battery voltage. |
| Power-Fail Threshold | 1.70V on PFI - allows early warning of 3.3V rail collapse before reset threshold is crossed. |
| Reset Pulse Width | 200ms min - satisfies minimum reset hold time requirements of ARM Cortex-M, PIC, and legacy 8051 µPs. |
| Operating Voltage | 3.06V to 5.5V - supports dual-rail systems (e.g., 3.3V µP + 5V peripherals) without external level shifting. |
Pinout & Package
MAX815TCSA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 150µA internal pullup; triggers 200ms reset pulse when pulled below 1.1V. |
| 2 VCC | Positive Supply Input | Primary power rail input (3.06–5.5V); reset comparator monitors this node directly. |
| 3 GND | Ground Reference | Analog and digital ground return; must be low-impedance for accurate threshold sensing. |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 1.70V; used to monitor auxiliary rails via resistive divider. |
| 5 PFO | Power-Fail Output | Active-low open-drain output sinking ≥1.2mA; signals impending supply collapse before reset asserts. |
| 6 WDI | Watchdog Input | CMOS-level input; each high↔low transition resets 1.56s watchdog timer; pulse width ≥50ns required. |
| 7 RESET | Reset Output | Active-low push-pull output; sinks ≥3.2mA at VCC=3.3V; guaranteed low ≤0.4V down to VCC=1.0V. |
| 8 WDO | Watchdog Output | Active-low push-pull output; mirrors RESET during VCC fault, but also goes low on watchdog timeout. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures deterministic reset across -40°C to +85°C and supply aging. |
| Independent Watchdog with 1.56s Timeout | Prevents firmware lockup without relying on µP clock or internal timers-critical for safety-critical control loops. |
| Power-Supply Glitch Immunity | Rejects VCC transients ≤30µs at 100mV overdrive, preventing spurious resets in noisy industrial environments. |
| Guaranteed RESET Validity to VCC = 1V | Enables fail-safe shutdown sequencing in battery-powered devices where VCC decays slowly under load. |
| 75µA Max Supply Current | Reduces quiescent power in always-on subsystems-e.g., real-time clocks or sensor wake-up circuits. |
Applications
| Medical Equipment | Controllers |
|---|---|
Use Scenario: Portable ECG monitor powered by single Li-ion cell with 3.3V LDO regulation. IC Role / Device Role / Timing Role: Supervises 3.3V rail, asserts RESET before brownout-induced µP corruption, and triggers orderly data save via PFO interrupt. Use Value: Prevents loss of critical waveform data during battery depletion by initiating shutdown at 3.03V with 200ms margin. |
Use Scenario: Industrial PLC I/O module with isolated 3.3V µP and 24V field-side power. IC Role / Device Role / Timing Role: Monitors 3.3V core supply and uses PFI to detect 24V field rail collapse via resistive divider. Use Value: Enables preemptive fault logging and safe I/O state freeze before main supply dropout disrupts communication. |
| Intelligent Instruments | Set-Top Boxes |
Use Scenario: Handheld multimeter with flash memory storage and LCD display. IC Role / Device Role / Timing Role: Provides power-on reset, manual reset via front-panel button (MR), and watchdog supervision of measurement firmware. Use Value: Ensures consistent boot state after battery insertion or accidental power interruption; prevents corrupted calibration data writes. |
Use Scenario: Cable STB with dual 3.3V/5V rails, HDMI interface, and conditional access IC. IC Role / Device Role / Timing Role: Supervises 3.3V µP rail and uses WDO→MR feedback to recover from HDMI handshake lockups. Use Value: Restores video/audio output without user intervention when firmware stalls during HDCP negotiation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TCSA | Lacks watchdog timer; offers LOW LINE output instead of WDO; identical 3.03V reset threshold and 75µA supply current. | Suitable where early low-line warning (e.g., NMI-triggered save) is prioritized over autonomous firmware recovery. | Select MAX814TCSA if system relies on µP-initiated recovery and requires voltage-margin alerting prior to reset. |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 350ms reset delay, 2.5µA quiescent current, no watchdog, push-pull RESET. | Better suited for ultra-low-power always-on monitoring but lacks watchdog or PFI/PFO functionality. | Choose TPS3808G33DBVR only for static supply monitoring where watchdog and power-fail warning are unnecessary. |
Compared with MAX815TCSA, MAX814TCSA removes watchdog capability but adds low-line detection for predictive brownout response, while TPS3808G33DBVR trades functional richness for extreme quiescent current reduction-making MAX815TCSA the sole choice when autonomous firmware recovery and dual-rail power-fail warning are required.
Availability
MAX815TCSA is available at Aetrix Electronics and suitable for medical equipment, industrial controllers, intelligent instrumentation, and set-top boxes requiring stable component supply with long-term lifecycle support.
Supply support for MAX815TCSA 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 was engineered specifically for high-reliability µP supervision in portable and battery-critical systems-emphasizing accuracy, low power, and robust transient immunity.
FAQ
What is the reset threshold voltage of the MAX815TCSA?
The MAX815TCSA has a factory-set reset threshold of 3.03V ±1%, optimized for 3.3V systems with tight supply tolerances (3.33V ±0.26V). This value is fixed by the 'T' suffix and confirmed in the Electrical Characteristics table for +3V parts under VRT parameter. The MAX815TCSA maintains this accuracy across -40°C to +85°C ambient temperature.
Does the MAX815TCSA include a watchdog timer, and what is its timeout period?
Yes, the MAX815TCSA integrates a dedicated watchdog timer with a nominal timeout period of 1.56 seconds. This is verified in the Electrical Characteristics table under tWD parameter for MAX815T. The timer resets on every WDI transition (high-to-low or low-to-high) and asserts WDO low upon timeout-enabling autonomous recovery from µP firmware hangs.
Can the MAX815TCSA monitor voltages other than VCC?
Yes, the MAX815TCSA can monitor auxiliary rails using the PFI pin. With its 1.70V internal reference, PFI accepts a resistive divider from any positive supply (e.g., +12V, +24V) to generate an early power-fail warning via PFO. This is documented in the Applications Information section and validated in Figure 11 of the datasheet for MAX815TCSA.
What is the minimum VCC voltage at which MAX815TCSA guarantees valid RESET output?
The MAX815TCSA guarantees RESET remains a valid active-low logic signal down to VCC = 1.0V, with VOL ≤ 0.4V at ISINK = 50µA. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables, enabling reliable reset assertion during deep battery discharge in portable equipment.
Is the MAX815TCSA pin-compatible with other parts in the MAX814/MAX815/MAX816 family?
Yes, the MAX815TCSA shares identical 8-pin SO packaging and pinout with MAX814TCSA and MAX816TCSA, including VCC, GND, MR, PFI, PFO, RESET, WDI (or LOW LINE/RESET IN), and WDO (or RESET). Pin compatibility is confirmed in the Pin Configurations diagram and Selector Table-allowing drop-in substitution where functional differences (e.g., watchdog presence) are acceptable.
MAX815TCSA 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 FAQ
1.How can I place an order for MAX815TCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815TCSA 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 reliable?
The price and inventory of MAX815TCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815TCSA is usually 5 days.
3.What payment methods are accepted for MAX815TCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815TCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815TCSA?
MAX815TCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815TCSA 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?
For technical support, including MAX815TCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815TCSA requirements.
6.How does Aetrix verify that MAX815TCSA is sourced from the original manufacturer or authorized distributors?
All MAX815TCSA 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 meets industry standards.
7.What is the process for return or replacement of MAX815TCSA?
All MAX815TCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX815TCSA, 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 part is unused and in its original packaging.
Return procedure for MAX815TCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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