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Analog Devices Inc./Maxim Integrated MAX802TCPA+
- Part No.:
- MAX802TCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX802TCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:603
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Product details
Overview
MAX802TCPA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-low RESET output, precision 3.075V reset threshold (±2% tolerance), 200ms reset timeout, watchdog timer (1.6s timeout), and battery-backup switchover capability. It monitors VCC supply integrity, asserts reset during power-up/brownout/watchdog fault, and switches VOUT to VBATT when VCC falls below 2.40V - used in embedded controllers requiring reliable power sequencing and RAM retention.
For engineers reviewing the MAX802TCPA+ datasheet, MAX802TCPA+ pinout, MAX802TCPA+ application, or MAX802TCPA+ equivalent, key selection criteria include guaranteed RESET assertion down to VCC = 1V, 40µA VCC supply current, ±2% reset threshold accuracy, battery-switching hysteresis, and compatibility with lithium coin-cell backup sources in portable industrial systems.
Technical Context
The MAX802TCPA+ integrates a precision voltage comparator for reset generation, a 1.6s watchdog timer with edge-triggered clear, a battery switchover circuit with 140Ω VBATT-to-VOUT switch and 3Ω VCC-to-VOUT PMOS switch, and a separate power-fail comparator referenced to 1.237V with 10mV hysteresis. Its reset logic guarantees low-state assertion until VCC exceeds 3.075V and remains low for exactly 200ms post-threshold crossing.
It operates across 0°C to +70°C, supports VCC from 2.72V to 5.5V (T-grade), and features dual-supply monitoring: VCC for main system rail and VBATT (up to 6.0V) for backup source. The device enters battery-backup mode only when VCC < 2.40V and VBATT > VCC, preventing premature battery discharge while ensuring CMOS RAM retention above 2.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±2%) - ensures reset assertion before 3.3V supply drops below system stability margin |
| Reset Timeout Period | 200ms - provides sufficient hold time for µP initialization after power stabilization |
| VCC Supply Current | 40µA at VCC < 3.6V - enables ultra-low-power operation in battery-backed standby mode |
| Watchdog Timeout | 1.6s - detects µP lockup without requiring external timing components |
| Battery Switch Threshold | 2.40V rising / 2.30V falling - initiates switchover before VOUT drops below 2.0V RAM retention limit |
| Power-Fail Input Threshold | 1.237V ±10mV - allows accurate monitoring of auxiliary rails via resistor divider |
| RESET Output Type | Active-low push-pull - drives µP reset pin directly without external pull-up |
Pinout & Package
MAX802TCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body and through-hole mounting. Pin spacing conforms to JEDEC MS-001, lead finish is lead-free (RoHS-compliant) as indicated by the "+" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC and VBATT; connected to VCC via 3Ω PMOS when active, to VBATT via 140Ω switch during brownout |
| 2 - VCC | Main supply input | Primary 3.0V/3.3V system rail input; monitored for reset generation and battery switchover control |
| 3 - GND | Ground reference | Common return path for all internal circuits and external decoupling capacitors |
| 4 - PFI | Power-fail input | Monitors auxiliary voltage via external divider; triggers PFO low when input falls below 1.237V |
| 5 - PFO | Power-fail output | Open-drain active-low signal indicating undervoltage on PFI or VCC < 2.40V |
| 6 - WDI | Watchdog input | Edge-sensitive input; reset triggered if no transition occurs within 1.6s |
| 7 - RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, or watchdog timeout; guaranteed valid down to VCC = 1V |
| 8 - VBATT | Backup-battery input | Accepts up to 6.0V; powers VOUT when VCC fails; may exceed VCC in normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | ±2% tolerance (vs. ±4% in MAX690/MAX704) - reduces false resets in tight-tolerance 3.3V systems |
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior even during deep brownout conditions |
| Battery switchover with hysteresis | 2.40V rising / 2.30V falling threshold prevents oscillation during VCC recovery |
| Low quiescent current | 40µA VCC supply current - extends battery life in always-on backup applications |
| Integrated watchdog timer | 1.6s timeout with automatic clear on WDI edge - eliminates need for external RC timing network |
Applications
| Battery-Powered Embedded Controller | Intelligent Portable Instrument |
|---|---|
|
Use Scenario: Handheld data logger operating on single 3.3V Li-ion cell with SRAM buffer requiring continuous power during main supply interruption. IC Role / Device Role: Supervisory circuit providing brownout detection, RAM backup switchover, and watchdog supervision of ARM Cortex-M0 firmware. Use Value: Prevents data corruption by asserting RESET before VCC drops below 3.075V and switching VOUT to VBATT at 2.40V - preserving SRAM contents above 2.0V. |
Use Scenario: Field-deployable environmental sensor node with 3.3V main supply and coin-cell backup, transmitting measurements over LoRaWAN. IC Role / Device Role: Power monitor and reset manager ensuring µP restarts cleanly after intermittent solar charging gaps. Use Value: 40µA VCC current minimizes standby drain; 200ms reset timeout aligns with µP boot sequence; WDI interface detects firmware hangs during radio transmission. |
| Critical µP Power Monitoring | Industrial Controller with RAM Retention |
|
Use Scenario: PLC I/O module powered from 3.3V isolated DC-DC converter, requiring fail-safe reset during input rail transients. IC Role / Device Role: Primary power supervisor asserting RESET on VCC dips >100mV for ≤40µs - rejecting noise while responding to true brownouts. Use Value: Immunity to short VCC glitches avoids spurious resets; ±2% reset threshold matches 3.3V ±5% supply spec. |
Use Scenario: Factory automation HMI panel with static RAM storing calibration data, backed by 3.6V lithium battery. IC Role / Device Role: Battery switchover controller maintaining VOUT ≥2.0V during 100ms AC mains dropout. Use Value: 140Ω VBATT-to-VOUT switch resistance limits voltage drop under 1mA RAM load; switchover hysteresis prevents chatter near 2.40V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802TSA+ | Same electrical specs but in 8-pin SOIC package - smaller footprint, surface-mount compatible | Suitable for space-constrained PCBs where through-hole DIP is impractical | Select MAX802TSA+ when board real estate or automated assembly requires SOIC packaging |
| MAX804TCPA+ | Identical pinout and supervisory functions, but features active-high open-drain RESET output instead of push-pull | Requires external pull-up resistor; interfaces directly with µPs needing high-asserted reset signals | Choose MAX804TCPA+ only when system design mandates active-high reset polarity and can accommodate external pull-up |
Compared with MAX802TSA+, the MAX802TCPA+ offers identical functionality in through-hole DIP for prototyping or legacy designs; compared with MAX804TCPA+, it eliminates external components by providing push-pull RESET, reducing BOM count and layout complexity in new 3.3V µP systems.
Availability
MAX802TCPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply across industrial temperature ranges and long-term production continuity.
Supply support for MAX802TCPA+ 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 power management, sensing, and connectivity in industrial, automotive, and computing applications.
The MAX802 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power-up sequencing, brownout protection, and battery-backed RAM retention in 3.0V/3.3V embedded systems.
FAQ
What is the exact reset threshold voltage for MAX802TCPA+?
The MAX802TCPA+ has a nominal reset threshold 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, meeting tight-margin system requirements. The threshold is factory-trimmed and guaranteed per datasheet Table "Reset Threshold".
Does MAX802TCPA+ support battery backup with lithium cells exceeding VCC?
Yes, MAX802TCPA+ explicitly supports VBATT voltages exceeding VCC - such as 3.6V lithium coin cells - during normal operation. Its battery switchover circuit activates when VCC falls below 2.40V (rising threshold), connecting VBATT to VOUT via a 140Ω internal switch while isolating VCC, ensuring uninterrupted RAM power without risk of reverse current.
Can the watchdog timer in MAX802TCPA+ be disabled?
No, the watchdog timer in MAX802TCPA+ cannot be disabled. It continuously monitors the WDI pin and triggers a reset if no rising or falling edge occurs within 1.6 seconds. This fixed-function design eliminates configuration errors and ensures fail-safe µP supervision - a deliberate architectural choice confirmed in the "Watchdog Input" section of the datasheet.
What is the maximum allowable VCC transient duration that will not trigger reset in MAX802TCPA+?
For a 100mV overdrive (i.e., VCC dropping 100mV below the 3.075V threshold), MAX802TCPA+ tolerates negative-going transients up to 40µs without issuing a reset pulse. This immunity is characterized in Figure 7 of the datasheet and ensures robust operation in electrically noisy environments where brief supply glitches occur.
Is MAX802TCPA+ pin-compatible with other MAX80xT variants like MAX804TCPA+?
MAX802TCPA+ and MAX804TCPA+ share identical pinout and package (8-pin PDIP), but differ in RESET output type: MAX802TCPA+ provides active-low push-pull RESET, while MAX804TCPA+ provides active-high open-drain RESET. Direct substitution requires circuit-level validation of reset polarity and pull-up requirements - they are not functionally interchangeable without modification.
MAX802TCPA+ 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:
- -
MAX802TCPA+ FAQ
1.How can I place an order for MAX802TCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX802TCPA+ 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 MAX802TCPA+ reliable?
The price and inventory of MAX802TCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX802TCPA+ is usually 5 days.
3.What payment methods are accepted for MAX802TCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX802TCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX802TCPA+?
MAX802TCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX802TCPA+ 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 MAX802TCPA+?
For technical support, including MAX802TCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX802TCPA+ requirements.
6.How does Aetrix verify that MAX802TCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX802TCPA+ 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 MAX802TCPA+ meets industry standards.
7.What is the process for return or replacement of MAX802TCPA+?
All MAX802TCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX802TCPA+, 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 MAX802TCPA+ part is unused and in its original packaging.
Return procedure for MAX802TCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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