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Analog Devices Inc./Maxim Integrated MAX802RCPA+
- Part No.:
- MAX802RCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX802RCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:505
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Product details
Overview
MAX802RCPA+ from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with active-low RESET output, precision reset threshold of 2.625V (±2%), 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 sequencing.
For engineers reviewing the MAX802RCPA+ datasheet, MAX802RCPA+ pinout, MAX802RCPA+ application, or MAX802RCPA+ equivalent, key selection criteria include its R-suffix 2.625V reset threshold, ±2% tolerance, guaranteed RESET assertion down to VCC = 1V, 40µA VCC supply current, and compatibility with lithium backup batteries exceeding VCC voltage.
Technical Context
The MAX802RCPA+ integrates a precision reset comparator with 10mV typical hysteresis, a 1.6-second watchdog timer that clears on WDI edge transitions, and a dual-path battery switchover circuit using PMOS switches (3Ω VCC-to-VOUT, 140Ω VBATT-to-VOUT). Its PFI input monitors external supplies with 1.237V threshold and 10mV hysteresis, independent of reset logic.
It operates across 0°C to +70°C, supports VCC from 2.72V to 5.5V (R-suffix variant), and guarantees RESET low for VCC < 2.625V (falling) or < 2.59V (rising), with propagation delay under 26µs over temperature. The device lacks disable capability for watchdog or manual reset functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (±2%) - ensures reset assertion before 3.0V supply falls below 2.59V, suitable for 3.0V ±10% systems |
| Reset Timeout Period | 200ms (140–280ms range) - provides sufficient deassertion delay after power recovery to stabilize µP clocks and peripherals |
| VCC Supply Current | 40µA (typ) at VCC < 3.6V - enables ultra-low-power operation in battery-backed embedded systems |
| Watchdog Timeout | 1.6s (1.12–2.24s) - detects µP lockup without requiring software intervention or external timing components |
| Battery Switch Threshold | 2.40V (VBATT > VCC) - initiates switchover prior to CMOS RAM data retention limit (~2.0V), preserving memory during brownout |
| PFO Threshold Accuracy | ±2% - delivers precise power-fail warning for auxiliary supply monitoring with minimal calibration overhead |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade industrial and portable equipment environments |
Pinout & Package
MAX802RCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body, RoHS-compliant lead-free finish indicated by the '+' suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω PMOS); connects to RAM VDD; must not be shorted to GND |
| 2 - VCC | Main system supply input | Accepts 2.72V–5.5V; powers internal circuitry and enables reset comparator; monitored for brownout detection |
| 3 - GND | Ground reference | Common return for all analog and digital functions; requires local 0.1µF decoupling |
| 4 - PFI | Power-fail input | Monitors external supply via resistor divider; triggers PFO low when voltage falls below 1.237V (±2%) |
| 5 - PFO | Power-fail open-drain output | Active-low signal indicating PFI undervoltage or VCC < 2.40V; can drive MR on MAX704/MAX806 for cascaded reset |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets watchdog timer; tied high/low causes 1.6s timeout and forced reset |
| 7 - RESET | Active-low reset output | Open-drain, logic-low during reset assertion; requires external pull-up; drives µP reset pin directly |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; may exceed VCC; powers VOUT during main supply failure; leakage < 1µA |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.625V with ±2% tolerance - tighter than MAX690R (±4%), enabling robust operation in 3.0V ±10% systems |
| Guaranteed RESET to VCC = 1V | Ensures valid reset signaling even during deep brownout, supporting fail-safe µP initialization |
| Battery switchover with 2.40V threshold | Prevents premature battery engagement while maximizing backup runtime and avoiding RAM data loss |
| 1.6s watchdog timer with edge-clearing | Eliminates need for external watchdog IC; immune to static WDI states; no disable option prevents accidental bypass |
| 40µA VCC quiescent current | Reduces standby power in always-on portable devices; complements low-leakage battery mode (<1µA) |
| Independent PFI/PFO comparator | Enables monitoring of secondary supplies (e.g., analog rails) without affecting reset timing or VCC supervision |
Applications
| Battery-Powered Embedded Controller | Critical µP Power Monitoring |
|---|---|
Use Scenario: Industrial sensor node powered by 3.0V Li-SOCl₂ battery with CMOS SRAM for logging. IC Role / Device Role / Timing Role: Supervises main supply, asserts RESET during battery depletion, switches RAM to backup, and triggers watchdog if firmware hangs. Use Value: Prevents corrupted log writes during brownout; extends usable battery life via precise 2.625V reset point and low 40µA supply current. |
Use Scenario: Medical diagnostic instrument requiring guaranteed µP restart on any supply anomaly. IC Role / Device Role / Timing Role: Primary reset supervisor with 200ms timeout, 1.6s watchdog, and VCC/VBATT switchover to maintain RAM state during AC dropout. Use Value: Meets IEC 60601 safety requirements via deterministic reset behavior, ±2% threshold accuracy, and guaranteed assertion down to VCC = 1V. |
| Portable Data Acquisition Unit | Intelligent Instrument with Dual-Supply Monitoring |
Use Scenario: Handheld multimeter with 3.3V main rail and 3.6V lithium backup, storing calibration data in SRAM. IC Role / Device Role / Timing Role: Monitors VCC for brownout, asserts RESET, and routes VBATT to VOUT before RAM retention voltage is breached. Use Value: Eliminates need for external diode-OR circuit; 2.40V switchover threshold preserves >95% of battery capacity versus earlier 2.7V solutions. |
Use Scenario: Test equipment monitoring both 3.3V digital and –5V analog supplies. IC Role / Device Role / Timing Role: Uses PFI to monitor negative rail via resistive divider; asserts PFO to trigger system shutdown before analog section fails. Use Value: Leverages independent PFI comparator (1.237V threshold, ±2%) without interfering with primary reset function or adding BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802SCPA+ | 2.925V reset threshold (±2%), higher trip point for 3.3V ±10% systems | Suitable where brownout margin must accommodate wider supply tolerance | Select when system VCC nominal is 3.3V and design requires reset at ~2.93V rather than 2.63V |
| MAX802TCPA+ | 3.075V reset threshold (±2%), tightest tolerance among R/S/T variants | Optimized for 3.3V ±5% supplies; asserts reset later than R- or S-suffix parts | Choose for applications needing highest immunity to transient dips in stable 3.3V rails |
Compared with MAX802RCPA+, the S- and T-suffix variants offer higher reset thresholds (2.925V and 3.075V) with identical timing, watchdog, and switchover performance - enabling direct substitution in designs where supply tolerance or brownout sensitivity differs, without PCB or firmware changes.
Availability
MAX802RCPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and intelligent instruments requiring stable component supply and long-term lifecycle support.
Supply support for MAX802RCPA+ 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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX802RCPA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power monitoring and reset generation in 3.0V/3.3V embedded systems with battery backup requirements.
FAQ
What is the exact reset threshold voltage for MAX802RCPA+ and how is it specified?
The MAX802RCPA+ has a nominal reset threshold of 2.625V, with a guaranteed tolerance of ±2% over temperature and supply variations. This means the actual threshold falls between 2.59V (rising) and 2.70V (falling), optimized for 3.0V ±10% power systems. The 'R' suffix explicitly denotes this 2.625V variant, distinguishing it from S- (2.925V) and T- (3.075V) versions. The MAX802RCPA+ datasheet confirms this value in the Electrical Characteristics table under VRST.
Does MAX802RCPA+ support battery voltages higher than VCC, and what is the maximum allowed?
Yes, MAX802RCPA+ supports VBATT exceeding VCC - a core feature enabling use with standard 3.6V lithium coin cells alongside 3.0V or 3.3V main supplies. The absolute maximum rating for VBATT is +6.0V, and the device guarantees safe switchover when VBATT > VCC and VCC falls below 2.40V. This behavior is confirmed in the Absolute Maximum Ratings and Detailed Description sections of the MAX802RCPA+ datasheet.
What is the function of the WDI pin on MAX802RCPA+, and can it be disabled?
The WDI (Watchdog Input) pin on MAX802RCPA+ is edge-sensitive: a rising or falling transition clears the 1.6s internal watchdog timer. If WDI remains static (high or low) for longer than 1.6s, the timer expires and forces a reset. Unlike some older supervisors, the watchdog function in MAX802RCPA+ cannot be disabled - it is always active. This is explicitly stated in the Watchdog Input section of the MAX802RCPA+ datasheet.
How does MAX802RCPA+ handle power-fail detection, and what is the PFI threshold?
MAX802RCPA+ uses the PFI (Power-Fail Input) pin to monitor auxiliary supplies via an external resistor divider. Its internal comparator trips at 1.237V (±2%), generating a low-going PFO signal when PFI falls below this threshold. The PFI input draws only ±25nA, minimizing loading error. This function operates independently of VCC monitoring and is documented in the Electrical Characteristics and Detailed Description sections for MAX802RCPA+.
Is MAX802RCPA+ pin-compatible with other devices in the MAX802 family, such as MAX802SCPA+ or MAX802TCPA+?
Yes, MAX802RCPA+ is fully pin-compatible with MAX802SCPA+ and MAX802TCPA+ - all share identical 8-pin PDIP packaging, pinout, electrical interface, and functional block diagram. The only difference is the reset threshold voltage (2.625V vs. 2.925V vs. 3.075V), making them direct drop-in alternatives for designs requiring different brownout sensitivity. This compatibility is confirmed in the Pin Description and Ordering Information tables of the MAX802RCPA+ datasheet.
MAX802RCPA+ 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:
- -
MAX802RCPA+ FAQ
1.How can I place an order for MAX802RCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX802RCPA+ 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 MAX802RCPA+ reliable?
The price and inventory of MAX802RCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX802RCPA+ is usually 5 days.
3.What payment methods are accepted for MAX802RCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX802RCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX802RCPA+?
MAX802RCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX802RCPA+ 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 MAX802RCPA+?
For technical support, including MAX802RCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX802RCPA+ requirements.
6.How does Aetrix verify that MAX802RCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX802RCPA+ 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 MAX802RCPA+ meets industry standards.
7.What is the process for return or replacement of MAX802RCPA+?
All MAX802RCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX802RCPA+, 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 MAX802RCPA+ part is unused and in its original packaging.
Return procedure for MAX802RCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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