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Analog Devices Inc./Maxim Integrated MAX814TCPA+
- Part No.:
- MAX814TCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX814TCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,589
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Product details
Overview
MAX814TCPA+ from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit providing power-on reset, manual reset, power-fail monitoring, and low-line detection for +3V systems. It features a 3.03V fixed reset threshold, 200ms reset pulse width, active-low RESET output, and guaranteed operation down to VCC = 1V. It is used in portable medical instruments and battery-powered controllers requiring reliable brownout immunity.
For engineers reviewing the MAX814TCPA+ datasheet, MAX814TCPA+ pinout, MAX814TCPA+ application, or MAX814TCPA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed +3V system compatibility, real-world timing behavior (200ms tRS, 60mV low-line offset), and validated alternatives for critical µP supervision in space-constrained industrial and portable designs.
Technical Context
The MAX814TCPA+ implements a precision voltage-monitoring architecture with independent comparators for reset (3.03V ±1%), low-line (3.09V, 60mV above reset), and power-fail (1.70V PFI threshold). Its reset generator includes a 200ms internal timer and guarantees valid logic-low RESET output even as VCC drops to 1V - enabling robust brownout recovery in battery-depleted conditions.
All comparator inputs feature high-impedance sensing (≤35nA leakage on RESET IN, though unused here) and glitch immunity: fast transients ≤30µs at 100mV overdrive do not trigger false resets. The manual reset input (MR) has an internal 150µA pullup and accepts CMOS/TTL logic, supporting both switch-driven and processor-controlled reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - ensures reset assertion before +3.3V system ICs (e.g., ARM Cortex-M0) drop below minimum operating voltage. |
| Reset Pulse Width | 200ms - provides sufficient hold time for full µP initialization and peripheral stabilization after power-up or brownout. |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered portable equipment without compromising supervision reliability. |
| Low-Line Offset | 60mV above reset threshold - delivers early warning (at ~3.09V) for orderly shutdown before 3.03V reset triggers. |
| VCC Operating Range | 1.0V to 5.5V - guarantees RESET remains valid and asserted during deep brownout, down to near-dead-battery conditions. |
| Power-Fail Input Threshold | 1.70V - supports external voltage divider monitoring of auxiliary rails (e.g., +12V via 7:1 divider) with precise undervoltage detection. |
| MR Input Threshold | 1.10V low / 0.7×VCC high - compatible with 3.3V and 1.8V logic families; internal 150µA pullup eliminates external biasing. |
Pinout & Package
MAX814TCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, RoHS-compliant lead-free finish (+ suffix), rated for 0°C to +70°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input; pulls RESET low when <1.10V; internal 150µA pullup to VCC enables direct switch-to-GND connection. |
| 2 | VCC | +1.0V to +5.5V supply input; RESET remains valid and asserted down to 1V, critical for battery-fail scenarios. |
| 3 | GND | Ground reference for all comparators and outputs; must be low-impedance to ensure noise-immune threshold detection. |
| 4 | PFI (Power-Fail Input) | Monitors external voltage divider; asserts PFO low when input falls below 1.70V - used for early-warning shutdown. |
| 5 | PFO (Power-Fail Output) | Open-drain output sinking ≥1.2mA; connects to µP interrupt pin to initiate data save before main supply collapse. |
| 6 | LOW LINE | Active-low comparator output asserting at VCC = 3.09V (60mV above reset); signals imminent brownout to NMI input. |
| 7 | RESET | Active-low open-drain reset output; sinks ≥3.2mA at 0.4V; requires external pullup for µP reset pin interface. |
| 8 | RESET | Active-high complementary output (inverse of pin 7); directly drives µP reset pins requiring high-active assertion. |
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), line, and load variations in +3.3V systems. |
| Guaranteed RESET validity to VCC = 1V | Enables fail-safe reset assertion during deep battery discharge - no external supervision needed below 1.2V. |
| 60mV low-line detector offset | Provides 200µs–500µs advance warning before reset triggers, allowing µP to flush buffers and disable peripherals before power loss. |
| 75µA maximum supply current | Reduces quiescent load on primary battery by >5× versus legacy supervisors, extending runtime in portable medical monitors. |
| Power-supply glitch immunity | Rejects transients ≤30µs at 100mV overdrive - prevents spurious resets from switching noise or ESD-induced VCC dips. |
Applications
| Medical Patient Monitor | Battery-Powered Data Logger |
|---|---|
|
Use Scenario: Portable ECG device operating from single Li-ion cell (2.7V–4.2V), requiring fail-safe reset during battery sag below 3.03V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET at 3.03V and LOW LINE at 3.09V to trigger ADC shutdown and flash write completion. Use Value: Prevents corrupted waveform storage by guaranteeing 200ms reset hold and 60mV early-warning margin before brownout. |
Use Scenario: Remote environmental sensor logging temperature/humidity every 10 seconds using CR2032 coin cell. IC Role / Device Role / Timing Role: Low-current (75µA) supervisor monitoring VCC to detect end-of-life battery voltage decay below 3.03V. Use Value: Extends usable battery life by 18+ months while ensuring clean µP reset before SRAM data loss occurs. |
| Industrial PLC I/O Module | Set-Top Box Power Sequencer |
|
Use Scenario: DIN-rail mounted controller with isolated +3.3V logic rail derived from wide-input DC-DC converter. IC Role / Device Role / Timing Role: Voltage supervisor detecting undervoltage on +3.3V rail and asserting RESET to halt FPGA configuration if VCC < 3.03V. Use Value: Avoids partial FPGA bitstream loading and state-machine lockup by enforcing strict 3.03V ±1% power-good window. |
Use Scenario: Consumer STB with dual-rail power (5V standby, 3.3V main) requiring coordinated reset sequencing on AC restore. IC Role / Device Role / Timing Role: Supervisor monitoring +3.3V main rail and generating 200ms delayed RESET to synchronize SoC boot after LDO stabilization. Use Value: Eliminates boot failures caused by premature clock enable or memory access before 3.3V rail settles within tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V reset threshold (±0.5%), 350ms default delay, no low-line output, 1.6µA quiescent current. | Lacks low-line warning and PFO/PFI; suited for ultra-low-power sleep-mode supervision but not brownout mitigation. | Select when lowest possible IQ dominates over early-warning capability and 200ms timing precision is noncritical. |
| ADM6803-3ARTZ-R7 | 3.08V reset threshold (±2.5%), 240ms delay, no PFI/PFO, no low-line output, 12µA IQ. | Higher threshold tolerance and no auxiliary monitoring features; suitable only for basic reset-only use cases. | Choose only if ±2.5% reset accuracy is acceptable and power-fail warning or low-line detection is unnecessary. |
Compared with TPS3808G33DBVR and ADM6803-3ARTZ-R7, the MAX814TCPA+ uniquely delivers ±1% reset accuracy *plus* integrated low-line detection and power-fail monitoring - making it the only option among the three that supports full brownout management with early warning, deterministic 200ms timing, and guaranteed 1V operation.
Availability
MAX814TCPA+ is available at Aetrix Electronics and suitable for medical patient monitors, battery-powered data loggers, industrial PLC I/O modules, and set-top box power sequencers requiring stable component supply across extended production lifecycles.
Supply support for MAX814TCPA+ 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, communications, and computing applications.
The MAX814/MAX815/MAX816 family was designed specifically for high-accuracy, low-power microprocessor supervision in portable and mission-critical systems - emphasizing ±1% reset threshold stability, sub-100µA IQ, and multi-function fault detection (reset, low-line, PFI/PFO).
FAQ
What is the exact reset threshold voltage of the MAX814TCPA+?
The MAX814TCPA+ has a factory-trimmed reset threshold of 3.03V ±1%, specified over the full 0°C to +70°C temperature range. This value is fixed and corresponds to the "T" suffix in the part number. It ensures reset assertion before +3.3V microcontrollers fall below their minimum operating voltage (typically 2.97V), preventing undefined behavior during brownout.
Does the MAX814TCPA+ support operation below 2.0V VCC?
Yes - the MAX814TCPA+ guarantees valid RESET output down to VCC = 1.0V. Below 1.0V, RESET becomes high-impedance, but the device continues asserting low-state RESET until that point. This behavior is critical for battery-powered applications where VCC may sag to 1.1V–1.3V before cutoff, ensuring µP remains held in reset until power is truly insufficient.
What is the function of the LOW LINE pin on the MAX814TCPA+?
The LOW LINE pin on the MAX814TCPA+ is an active-low comparator output that asserts when VCC falls to 60mV above the 3.03V reset threshold (i.e., at ~3.09V). It provides early warning of impending brownout, allowing the µP to execute shutdown routines - such as saving volatile data or disabling high-current peripherals - before the 200ms reset pulse begins.
Can the MAX814TCPA+ monitor voltages other than VCC?
Yes - the MAX814TCPA+ can monitor auxiliary supplies using the PFI/PFO pair. For example, connecting a resistor divider from a +12V rail to PFI (with GND return) allows detection when that rail falls below 1.70V × divider ratio. When PFI drops below threshold, PFO goes low to trigger µP interrupt, enabling coordinated shutdown of multiple power domains.
Is the MAX814TCPA+ pin-compatible with other MAX814 variants like MAX814KCPA+?
No - while all MAX814 variants share identical 8-pin DIP packaging and pinout, the MAX814TCPA+ (3.03V threshold) is not functionally interchangeable with MAX814KCPA+ (4.80V) or MAX814LCPA+ (4.70V) without circuit redesign. Using a higher-threshold variant on a +3.3V system would prevent reset assertion entirely, as VCC never reaches 4.7V.
MAX814TCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX814TCPA+ FAQ
1.How can I place an order for MAX814TCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814TCPA+ 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 MAX814TCPA+ reliable?
The price and inventory of MAX814TCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814TCPA+ is usually 5 days.
3.What payment methods are accepted for MAX814TCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814TCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814TCPA+?
MAX814TCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814TCPA+ 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 MAX814TCPA+?
For technical support, including MAX814TCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814TCPA+ requirements.
6.How does Aetrix verify that MAX814TCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX814TCPA+ 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 MAX814TCPA+ meets industry standards.
7.What is the process for return or replacement of MAX814TCPA+?
All MAX814TCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814TCPA+, 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 MAX814TCPA+ part is unused and in its original packaging.
Return procedure for MAX814TCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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