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Analog Devices Inc./Maxim Integrated MAX804TCPA+
- Part No.:
- MAX804TCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX804TCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
MAX804TCPA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 3.075V reset threshold (T-suffix), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover capability. It monitors VCC supply integrity, asserts reset during brownout or watchdog timeout, and switches CMOS RAM to VBATT when VCC drops below 2.40V-used in embedded controllers and portable equipment requiring reliable power-up sequencing and data retention.
For engineers reviewing the MAX804TCPA+ datasheet, MAX804TCPA+ pinout, MAX804TCPA+ application, or MAX804TCPA+ equivalent, key selection criteria include its ±2% reset threshold accuracy, 40µA VCC supply current, guaranteed RESET assertion down to VCC = 1V, and compatibility with lithium backup batteries exceeding VCC voltage.
Technical Context
The MAX804TCPA+ integrates a precision reset comparator with 10mV hysteresis, a non-disableable 1.6s watchdog timer cleared by WDI edges, and a dual-path battery switchover circuit using PMOS switches (3Ω VCC-to-VOUT, 140Ω VBATT-to-VOUT). Its PFI input accepts external undervoltage detection signals referenced to a 1.237V internal threshold.
It operates across 0°C to +70°C, supports VCC from 3.17V to 5.5V (T-version), and guarantees RESET deassertion only after VCC rises above 3.085V and holds for 200ms-ensuring stable µP startup. The active-high RESET output requires external pull-up and interfaces directly with bidirectional µP reset I/O via series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±2%) - ensures reset assertion before 3.3V supply falls below system stability margin |
| Reset Timeout | 200ms (140–280ms over temp) - provides sufficient hold time for µP initialization and clock stabilization |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - detects µP lockup without requiring software intervention |
| VCC Supply Current | 40µA (typ, VCC < 3.6V) - enables ultra-low-power operation in battery-backed systems |
| Battery Leakage | 0.01–0.5µA - minimizes drain on lithium coin cells during long-term storage |
| VBATT Switch Threshold | 2.40V (rising), 2.30V (falling) - initiates switchover before CMOS RAM retention voltage (2.0V) is compromised |
| PFI Threshold | 1.237V ±20mV - supports accurate external power-fail monitoring via resistor divider |
Pinout & Package
MAX804TCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body and RoHS-compliant lead finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | CMOS RAM supply output | Switches between VCC and VBATT based on switchover thresholds; must be decoupled with 0.1µF capacitor |
| VCC | Main system supply input | Accepts 3.17–5.5V; powers internal circuitry and drives VOUT when above reset threshold |
| GND | Analog/digital ground reference | Common return for all internal comparators, timers, and output drivers |
| PFI | Power-fail input | Compares external voltage to 1.237V reference; triggers PFO low when input falls below threshold |
| PFO | Power-fail open-drain output | Active-low signal indicating PFI undervoltage or VCC dropout; can drive MR on compatible devices |
| WDI | Watchdog input | Edge-sensitive input; reset triggered if no transition occurs within 1.6s; cannot be disabled |
| RESET | Active-high open-drain reset | Requires external pull-up to VCC; asserts high during reset conditions (brownout, watchdog, manual) |
| VBATT | Backup battery input | Supports voltages exceeding VCC; connects to VOUT when VCC drops below 2.40V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout, critical for data retention in volatile memory |
| Battery can exceed VCC in normal operation | Enables use of standard 3.6V lithium cells without level-shifting, simplifying backup power design |
| 200ms reset time delay | Meets µP minimum reset pulse width requirements while avoiding spurious resets from transient dips |
| ±2% reset threshold tolerance | Tighter than MAX690/MAX704 families, improving supply margin predictability in 3.3V ±5% systems |
| 1.6s watchdog timeout with edge-clearing | Prevents false triggers from noise; allows flexible software heartbeat timing without strict periodicity |
Applications
| Battery-Powered Portable Equipment | Embedded Industrial Controller |
|---|---|
Use Scenario: Handheld data logger operating on single-cell lithium battery with intermittent 3.3V system supply. IC Role / Device Role / Timing Role: Supervises VCC rail, asserts RESET during battery depletion or load-induced brownout, and seamlessly transfers RAM power to VBATT at 2.40V. Use Value: Prevents data corruption during power transitions and extends usable runtime by enabling precise low-voltage cutoff before RAM data loss. | Use Scenario: Programmable logic controller (PLC) module with nonvolatile RAM and watchdog-critical firmware execution. IC Role / Device Role / Timing Role: Monitors 3.3V supply, triggers hardware reset on µP lockup via WDI timeout, and provides power-fail warning through PFO to initiate safe state shutdown. Use Value: Eliminates need for discrete reset IC + watchdog + power-fail detector, reducing BOM count and PCB area by 3×. |
| Intelligent Test Instrument | Critical µP Power Monitoring |
Use Scenario: Bench multimeter with real-time calibration storage and auto-ranging logic powered by regulated 3.3V rail. IC Role / Device Role / Timing Role: Provides precise 3.075V reset threshold aligned with 3.3V ±5% supply tolerance, ensuring µP starts only after stable regulation is achieved. Use Value: Avoids erratic startup behavior caused by marginal supply voltage, improving measurement repeatability and user experience. | Use Scenario: Medical sensor node where µP must never execute corrupted code due to supply instability. IC Role / Device Role / Timing Role: Guarantees RESET remains asserted until VCC exceeds 3.085V and holds for full 200ms, with independent watchdog supervision. Use Value: Meets IEC 62304 Class C software safety requirements by enforcing deterministic reset timing and fault coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX804TESA+ | Same functionality and electrical specs, but in 8-pin SOIC package (S8+4 outline) | Preferred for space-constrained PCBs; thermal resistance differs (SO: 5.88mW/°C derating vs. PDIP: 9.09mW/°C) | Select MAX804TESA+ when board layout requires surface-mount assembly or higher density packaging. |
| MAX805TCPA+ | Identical pinout and package, but features active-low RESET (complementary output polarity) | Required when host µP expects active-low reset signal without external inversion logic | Choose MAX805TCPA+ only if system design mandates active-low reset assertion; otherwise MAX804TCPA+ avoids extra components. |
Compared with MAX804TESA+, the MAX804TCPA+ offers identical supervisory functionality in through-hole PDIP for prototyping or legacy wave-solder processes; compared with MAX805TCPA+, it provides active-high reset output eliminating need for external inverters in µP designs with unidirectional reset inputs.
Availability
MAX804TCPA+ is available at Aetrix Electronics and suitable for battery-powered computers, embedded controllers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX804TCPA+ 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 industrial, automotive, communications, and computing markets.
The MAX804TCPA+ belongs to the MAX80x family of 3.0V/3.3V µP supervisory circuits engineered specifically for reliable power monitoring, battery switchover, and watchdog protection in portable and embedded systems.
FAQ
What is the reset threshold voltage of the MAX804TCPA+?
The MAX804TCPA+ has a nominal reset threshold voltage of 3.075V, with ±2% tolerance over temperature and supply variations. This value is specified for VCC falling conditions and ensures reset assertion before the 3.3V supply drops below 3.00V, aligning with typical 3.3V ±5% system tolerances. The rising threshold is 3.085V, providing 10mV hysteresis to prevent oscillation near the trip point.
Does the MAX804TCPA+ support battery backup with VBATT higher than VCC?
Yes, the MAX804TCPA+ explicitly supports VBATT voltages exceeding VCC-enabling direct connection of standard 3.6V lithium coin cells without level-shifting. The internal battery switchover circuit activates when VCC falls below 2.40V (VSW), connecting VBATT to VOUT through a 140Ω switch. This design preserves CMOS RAM data even when main supply collapses, and is validated per datasheet Figure 1 and Table 1.
How does the watchdog timer function in the MAX804TCPA+?
The MAX804TCPA+ watchdog timer has a fixed 1.6s timeout period and cannot be disabled. It clears on any rising or falling edge at the WDI pin and triggers RESET if no edge occurs within the timeout window. During RESET assertion, the timer remains cleared and does not count. This behavior ensures robust µP lockup detection without software dependency, as confirmed in the Detailed Description section and Figure 2 timing diagram.
What is the purpose of the PFI and PFO pins on the MAX804TCPA+?
The PFI (Power-Fail Input) pin accepts an external voltage for undervoltage monitoring against a 1.237V internal reference, while PFO (Power-Fail Output) is an open-drain signal that goes low when PFI falls below threshold or VCC drops below 2.40V. These pins enable system-level power-fail warnings-for example, connecting PFO to MR on MAX704/MAX806 devices initiates reset, or interfacing with µP interrupts. Their operation is fully independent of the main reset comparator.
Can the MAX804TCPA+ operate with VCC below 3.3V?
Yes, the MAX804TCPA+ operates with VCC as low as 3.17V for the T-suffix version, and guarantees RESET assertion down to VCC = 1V. Its functional range extends to 5.5V, making it compatible with systems where the 3.3V rail may sag under load or during battery discharge. The 200ms reset timeout and ±2% threshold accuracy remain valid across this range, as verified in Electrical Characteristics tables and Absolute Maximum Ratings.
MAX804TCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX804TCPA+ FAQ
1.How can I place an order for MAX804TCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX804TCPA+ 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 MAX804TCPA+ reliable?
The price and inventory of MAX804TCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX804TCPA+ is usually 5 days.
3.What payment methods are accepted for MAX804TCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX804TCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX804TCPA+?
MAX804TCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX804TCPA+ 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 MAX804TCPA+?
For technical support, including MAX804TCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX804TCPA+ requirements.
6.How does Aetrix verify that MAX804TCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX804TCPA+ 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 MAX804TCPA+ meets industry standards.
7.What is the process for return or replacement of MAX804TCPA+?
All MAX804TCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX804TCPA+, 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 MAX804TCPA+ part is unused and in its original packaging.
Return procedure for MAX804TCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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