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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:3,007
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Product details
Overview
MAX815TCSA+T from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitor, and active-low reset output. It features a 3.03V reset threshold, 200ms reset timeout, 75µA max supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable/battery-powered equipment for reliable µP power monitoring during brownout and startup.
For engineers reviewing the MAX815TCSA+T datasheet, MAX815TCSA+T pinout, MAX815TCSA+T application, or MAX815TCSA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing behavior (1.56s watchdog timeout, 200ms reset pulse), true supply current (75µA), and validated alternative options for 3V-system supervisory design.
Technical Context
The MAX815TCSA+T implements a dedicated watchdog timer with 1.56s timeout triggered by WDI transitions, independent of the VCC reset comparator. Its reset generator asserts active-low RESET for ≥200ms after VCC rises above 3.03V or after MR release, with immunity to transients <30µs at 100mV overdrive.
It integrates a power-fail comparator referenced to 1.70V (T-suffix), driving open-drain PFO low when PFI falls below threshold; PFI accepts external voltage dividers for monitoring non-VCC rails. The manual reset input (MR) includes 150µA internal pullup and supports CMOS/TTL logic drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - precisely triggers reset at 3.03V for +3.3V systems with tight supply tolerance |
| Watchdog Timeout | 1.56 seconds - provides robust software execution monitoring without false timeouts |
| Reset Pulse Width | 200ms minimum - ensures µP completes full initialization before release |
| Supply Current | 75µA max - enables multi-year battery life in portable instrumentation |
| Operating Voltage Range | 1.0V to 5.5V - guarantees RESET validity down to 1V for ultra-low-brownout detection |
| Power-Fail Reference | 1.70V - matches T-suffix threshold for consistent early-warning signaling on 3.3V rails |
| MR Input Threshold | 1.10V low / 0.7×VCC high - compatible with standard CMOS logic levels across VCC range |
Pinout & Package
MAX815TCSA+T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (+T suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input with 150µA internal pullup; asserts RESET when pulled <1.10V; supports switch or logic drive |
| 2 | VCC | Positive supply input; RESET remains valid down to 1.0V; powers all internal comparators and timer |
| 3 | GND | Ground reference for all analog and digital functions; must be low-impedance connection |
| 4 | PFI | Power-fail input; compared to 1.70V internal reference; accepts external divider for rail monitoring |
| 5 | PFO | Open-drain power-fail output; sinks ≥1.2mA when PFI <1.70V; used for µP interrupt or reset initiation |
| 6 | WDI | Watchdog input; edge-sensitive; resets 1.56s timer on each transition; tolerant of noise via 500ns pulse width min |
| 7 | RESET | Active-low reset output; guaranteed logic low ≤0.4V at ISINK=3.2mA; holds µP in known state during fault |
| 8 | WDO | Watchdog output; open-drain; goes low on timeout or VCC reset assertion; no propagation delay |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures deterministic reset across temperature (-40°C to +85°C) and supply variation |
| Independent watchdog with 1.56s timeout | Prevents runaway code without coupling to power-rail stability-critical for safety-critical embedded control |
| Guaranteed RESET validity to VCC = 1V | Enables fail-safe shutdown sequencing in battery-powered devices before complete power collapse |
| Power-fail comparator with 1.70V reference | Supports early warning on 3.3V rails via PFI divider; allows µP to save data before reset assertion |
| 75µA max supply current | Reduces quiescent load on coin-cell or Li-ion backup supplies in medical and portable instruments |
| Glitch-immune reset comparator | Ignores VCC transients ≤30µs at 100mV overdrive-prevents spurious resets in noisy industrial environments |
Applications
| Medical Portable Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Battery-powered ECG monitor operating from single Li-ion cell with 2.7–4.2V range. IC Role / Device Role / Timing Role: Supervises 3.3V system rail; asserts RESET if VCC drops below 3.03V; triggers PFO interrupt at 1.70V PFI threshold for data save. Use Value: Enables >8-hour runtime with deterministic brownout response and zero firmware overhead for reset management. |
Use Scenario: DIN-rail mounted PLC module with isolated 3.3V logic supply and 24V field power. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail via VCC; uses PFI to track 24V field supply through resistor divider; asserts RESET on dual faults. Use Value: Provides hardware-level fault isolation between logic and field domains, eliminating software-based watchdog dependency. |
| Smart Energy Meter | Handheld Test Instrument |
Use Scenario: Revenue-grade meter with supercapacitor backup and metrology SoC requiring clean startup. IC Role / Device Role / Timing Role: Generates 200ms power-on reset pulse; monitors VCC for brownout; feeds WDO to SoC NMI for crash recovery. Use Value: Ensures metrology engine initializes fully before sampling begins-critical for ANSI C12.20 compliance. |
Use Scenario: Battery-operated oscilloscope with FPGA-based acquisition and ARM Cortex-M host. IC Role / Device Role / Timing Role: Uses MR for front-panel reset button; WDI toggled by FPGA heartbeat; PFO warns of battery sag before cutoff. Use Value: Unifies reset, watchdog, and power warning into one compact IC-reducing BOM count and PCB area by 33% vs discrete solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TCSA+T | No watchdog timer; includes LOW LINE output instead of WDO/WDI; same 3.03V reset and PFI/PFO | Suitable where early low-line warning is prioritized over software execution monitoring | Select when watchdog functionality is unnecessary and low-line detection for graceful shutdown is required |
| TPS3808G33DBVR | 3.3V fixed reset; no PFI/PFO; no watchdog; 1.8µA quiescent current; SOT-23-6 package | Targeted at ultra-low-power always-on monitoring, not multi-function supervision | Choose only for minimal-feature, space-constrained applications where PFI, WDI, and WDO are unused |
Compared with MAX815TCSA+T, MAX814TCSA+T offers identical reset accuracy and power-fail capability but trades watchdog functionality for low-line detection-making it optimal for battery-gauge-aware shutdown. TPS3808G33DBVR reduces size and current but sacrifices all monitoring flexibility, limiting use to basic reset-only scenarios.
Availability
MAX815TCSA+T is available at Aetrix Electronics and suitable for portable instrumentation, medical monitoring devices, and industrial PLC modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
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) 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 battery-powered and critical embedded systems-emphasizing accuracy, low power, and multi-function integration without external components.
FAQ
What is the exact reset threshold voltage of the MAX815TCSA+T?
The MAX815TCSA+T has a factory-trimmed reset threshold of 3.03V ±1%, specified over -40°C to +85°C. This value is fixed and corresponds to the "T" suffix in the part number. It is optimized for reliable reset assertion in +3.3V systems where supply tolerance is ±0.26V, ensuring operation across worst-case line, load, and temperature variations. The MAX815TCSA+T datasheet confirms this threshold is guaranteed under all operating conditions.
Does the MAX815TCSA+T include a watchdog timer, and what is its timeout period?
Yes, the MAX815TCSA+T integrates a dedicated watchdog timer with a nominal timeout period of 1.56 seconds. The timer resets on every transition (high-to-low or low-to-high) of the WDI pin and asserts WDO low upon timeout. Unlike the reset generator, the watchdog operates independently of VCC level-remaining active as long as VCC stays above 1.0V. This behavior is explicitly documented in the MAX815TCSA+T electrical characteristics table.
Can the MAX815TCSA+T monitor voltages other than VCC, and how is that implemented?
Yes, the MAX815TCSA+T can monitor external voltages using the PFI pin. By connecting a resistor divider between the target rail and GND, the voltage at PFI is scaled to match the internal 1.70V reference. For example, to monitor a 12V rail, a 6.07kΩ/1kΩ divider yields ~1.70V at PFI when the rail is at 12V. The MAX815TCSA+T datasheet specifies PFI input current ≤±6nA, enabling high-impedance, low-error sensing without loading the source.
What is the function of the WDO pin on the MAX815TCSA+T, and how does it behave during reset?
The WDO (Watchdog Output) pin on the MAX815TCSA+T is an open-drain output that goes low during watchdog timeout or when VCC falls below the 3.03V reset threshold. Crucially, WDO has no minimum pulse width and responds immediately-unlike RESET, which enforces a 200ms minimum low time. This makes WDO ideal for non-maskable interrupt (NMI) inputs where fast fault signaling is required. The MAX815TCSA+T block diagram and timing figures confirm this dual-trigger behavior.
Is the MAX815TCSA+T compatible with 1.8V or 2.5V logic interfaces for MR and WDI inputs?
Yes, the MR and WDI inputs of the MAX815TCSA+T are CMOS-compatible and operate across the full VCC range (1.0V to 5.5V). MR recognizes logic low at ≤1.10V and logic high at ≥0.7×VCC; WDI thresholds follow the same specification. Therefore, when VCC = 1.8V, MR high threshold is ~1.26V-fully compatible with 1.8V logic outputs. This interoperability is verified in the MAX815TCSA+T Electrical Characteristics table for +3V parts.
MAX815TCSA+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:
- 3.03V
- 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
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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