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Analog Devices Inc./Maxim Integrated MAX814TCSA+T
- Part No.:
- MAX814TCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814TCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,697
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Product details
Overview
MAX814TCSA+T from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with active-low RESET output, 3.03V reset threshold, 200ms reset timeout, and power-fail monitoring capability - designed for reliable power-on reset and brownout protection in 3.3V portable and medical systems.
For engineers reviewing the MAX814TCSA+T datasheet, MAX814TCSA+T pinout, MAX814TCSA+T application, or MAX814TCSA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed 3.03V ±1% reset accuracy, guaranteed RESET validity down to VCC = 1V, and real-world substitution guidance for +3V µP supervision.
Technical Context
The MAX814TCSA+T implements a precision voltage comparator with 3.03V ±1% factory-trimmed reset threshold referenced to VCC, and a separate low-line detector asserting at 60mV above that threshold. It features a manual-reset input (MR) with 150µA internal pullup and guaranteed 200ms minimum reset pulse width after MR release.
Its power-fail comparator monitors PFI against a 1.70V reference (confirmed for T-suffix parts), driving PFO low when PFI falls below threshold. All outputs - RESET, PFO, LOW LINE - are guaranteed functional down to VCC = 1V, with supply current capped at 75µA max across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - ensures deterministic reset initiation in 3.3V systems with ±0.26% supply tolerance. |
| Reset Timeout Delay | 200ms min - guarantees µP remains held in reset long enough for stable clock and supply settling. |
| Supply Current | 75µA max - enables use in battery-powered equipment with multi-year standby life. |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET assertion during deep brownout down to 1V, critical for graceful shutdown. |
| Power-Fail Reference | 1.70V on PFI - allows early warning detection of 3.3V rail collapse before reset threshold is crossed. |
| Low-Line Differential | 60mV above reset threshold - provides pre-reset warning for controlled data save in portable systems. |
| MR Input Threshold | 1.10V max (low), 0.7×VCC min (high) - compatible with CMOS/TTL logic and mechanical switch interfaces. |
Pinout & Package
MAX814TCSA+T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (+T suffix). Pin 1 is marked with a dot or bevel; pin numbering follows standard SO convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Manual-reset input - active-low trigger with 150µA internal pullup; asserts RESET when pulled ≤1.10V. |
| 2 | VCC | Positive supply input - powers device and serves as monitored rail for reset and low-line detection. |
| 3 | GND | Ground reference - common return for all internal comparators and output drivers. |
| 4 | PFI | Power-fail input - compared to 1.70V internal reference; used to monitor auxiliary rails or generate early warning. |
| 5 | PFO | Power-fail output - open-drain, active-low signal indicating PFI has fallen below 1.70V. |
| 6 | LOW LINE | Low-voltage warning output - active-low signal asserted when VCC drops 60mV above reset threshold. |
| 7 | RESET | Active-low reset output - guaranteed logic low (≤0.4V) for VCC ≥1V; holds µP in reset during power-up/down/brownout. |
| 8 | RESET | Active-high reset output - inverted copy of pin 7; provided for systems requiring high-asserted reset. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures system-level reset timing compliance over temperature, voltage, and process variation. |
| Guaranteed RESET validity to VCC = 1V | Enables robust brownout response in battery-powered devices where supply may sag below 2V before cutoff. |
| Power-supply glitch immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents spurious resets from noise or switching spikes. |
| Integrated low-line detector | Provides 60mV pre-reset warning for orderly data save without external components or firmware overhead. |
| 150µA MR internal pullup | Allows direct connection of momentary switch to GND without external resistor; reduces BOM count and layout area. |
Applications
| Medical Instrumentation | Portable Diagnostic Devices |
|---|---|
Use Scenario: Battery-powered handheld ultrasound or glucose meter requiring fail-safe boot sequence and low-power sleep mode. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and early low-battery warning via LOW LINE output. Use Value: Ensures deterministic µP initialization and enables 200ms window for EEPROM write completion before power loss. |
Use Scenario: Wearable ECG monitor operating from coin-cell battery with strict energy budget and safety-critical startup. IC Role / Device Role / Timing Role: Reset supervisor asserting active-low RESET until 3.3V rail stabilizes, while PFO signals impending power failure to initiate flash save. Use Value: 75µA quiescent current extends battery life; 3.03V threshold matches Li-ion discharge curve for optimal runtime utilization. |
| Industrial Controllers | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted PLC module exposed to wide ambient temperature and unregulated 24V input. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V logic rail for µP reset and uses PFI to detect 5V I/O rail collapse. Use Value: Independent PFI/PFO path enables selective subsystem shutdown without full system reset, improving fault isolation. |
Use Scenario: Consumer STB with multiple voltage rails (3.3V, 5V, 12V) and requirement for clean channel-change reboot. IC Role / Device Role / Timing Role: Primary reset generator for main SoC, with LOW LINE output triggering firmware-initiated soft reset before hard reset occurs. Use Value: 200ms reset pulse prevents partial register corruption; 60mV low-line margin avoids nuisance resets during transient load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TESA+ | Same 3.03V reset threshold, identical pinout and function, but rated for -40°C to +85°C extended temperature range. | Suitable for industrial or automotive environments where ambient exceeds 70°C. | Select MAX814TESA+ when operation beyond commercial temperature range is required; otherwise MAX814TCSA+T suffices for 0°C–70°C designs. |
| TPS3808G33DBVR | 3.3V reset threshold (±0.5%), 35µA supply current, no LOW LINE output, no PFI/PFO, only active-low RESET. | Lacks power-fail monitoring and pre-reset warning - limited to basic reset-only applications. | Choose TPS3808G33DBVR only if low-quiescent current is paramount and PFI/LOW LINE functionality is unused; MAX814TCSA+T retains full feature set. |
Compared with MAX814TESA+, MAX814TCSA+T offers identical core supervision but trades extended temperature support for lower cost in commercial-grade systems; versus TPS3808G33DBVR, it provides comprehensive voltage monitoring (PFI/PFO/LOW LINE) at higher quiescent current, enabling safer, more responsive power management.
Availability
MAX814TCSA+T is available at Aetrix Electronics and suitable for medical instrumentation, portable diagnostic devices, industrial controllers, and set-top box power management requiring stable component supply and long-term production continuity.
Supply support for MAX814TCSA+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 demanding industrial, medical, and communications applications.
The MAX814 family is part of Maxim's µP supervisory product line, engineered for high-accuracy reset generation, low-power operation, and robust power-fail detection in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX814TCSA+T?
The MAX814TCSA+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, ensuring precise reset initiation in 3.3V systems without external calibration.
Does the MAX814TCSA+T support power-fail monitoring on voltages other than VCC?
Yes - the MAX814TCSA+T supports external voltage monitoring via the PFI pin. When a resistive divider scales a target rail (e.g., +5V or +12V) to 1.70V, the internal 1.70V PFI comparator triggers PFO low. This is explicitly validated in the Applications Information section and Figures 1–3 of the datasheet for MAX814T/MAX815T/MAX816.
What is the function of the LOW LINE pin on the MAX814TCSA+T?
The LOW LINE pin on the MAX814TCSA+T is an active-low warning output that asserts when VCC falls to 60mV above the 3.03V reset threshold (i.e., ~3.09V). It provides pre-reset notification for controlled data save operations and is unique to the MAX814 variant - not present on MAX815 or MAX816.
Can the MAX814TCSA+T operate with VCC below 3.03V and still assert RESET?
Yes - the MAX814TCSA+T guarantees RESET remains valid (logic low ≤0.4V) down to VCC = 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. This enables reliable brownout response even as the 3.3V rail collapses well below its nominal value, supporting graceful shutdown in battery-powered systems.
Is the MAX814TCSA+T pin-compatible with other MAX814 variants like MAX814KCSA+?
Yes - all MAX814 variants (K/L/N/T) share identical 8-pin SO packaging, pinout, and electrical interface. The only difference is the factory-set reset threshold (4.80V, 4.70V, 4.55V, or 3.03V), making MAX814TCSA+T a direct drop-in replacement in 3.3V designs where the K/L/N versions would assert reset prematurely.
MAX814TCSA+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, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX814TCSA+T FAQ
1.How can I place an order for MAX814TCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814TCSA+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 MAX814TCSA+T reliable?
The price and inventory of MAX814TCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814TCSA+T is usually 5 days.
3.What payment methods are accepted for MAX814TCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814TCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814TCSA+T?
MAX814TCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814TCSA+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 MAX814TCSA+T?
For technical support, including MAX814TCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814TCSA+T requirements.
6.How does Aetrix verify that MAX814TCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX814TCSA+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 MAX814TCSA+T meets industry standards.
7.What is the process for return or replacement of MAX814TCSA+T?
All MAX814TCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX814TCSA+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 MAX814TCSA+T part is unused and in its original packaging.
Return procedure for MAX814TCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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