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Analog Devices Inc./Maxim Integrated MAX804RCPA+
- Part No.:
- MAX804RCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX804RCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
MAX804RCPA+ from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 2.625V reset threshold (±2% tolerance), 200ms reset timeout, and integrated watchdog timer (1.6s timeout). It provides battery-backup switchover, power-fail detection (PFI/PFO), and manual reset input for embedded controllers and battery-powered systems.
For engineers reviewing the MAX804RCPA+ datasheet, MAX804RCPA+ pinout, MAX804RCPA+ application, or MAX804RCPA+ equivalent, this page delivers verified specifications, package mapping to 8-pin SOIC, functional role in µP power monitoring, and validated alternative parts for brownout protection and RAM backup design.
Technical Context
The MAX804RCPA+ integrates a precision voltage monitor with hysteresis, a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power switch enabling VOUT connection to either VCC or VBATT based on VSW (2.40V) and VRST (2.625V) thresholds. Its battery switchover logic ensures CMOS RAM retention during brownout by engaging VBATT before VOUT drops below 2.0V.
It features an active-high open-drain RESET output (inverse of MAX690/MAX704 series), PFI comparator referenced to 1.237V ±10mV, and guaranteed RESET assertion down to VCC = 1.0V. The device operates across 0°C to +70°C and supports lead-free packaging via the "+" suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (±2%), precisely calibrated for 3.0V ±10% supply monitoring with 10mV hysteresis to prevent oscillation during brownout recovery. |
| Reset Timeout Period | 200ms (140–280ms over temperature), ensuring µP remains held in reset long enough for stable power rail recovery before code execution. |
| Watchdog Timeout | 1.6s (1.12–2.24s over temperature), providing fail-safe recovery if µP fails to toggle WDI - critical for unattended embedded systems. |
| VCC Supply Current | 40µA typical (VCC < 3.6V), enabling ultra-low-power operation in battery-backed applications without compromising supervision accuracy. |
| Battery Supply Current | 0.4–1.0µA (max), minimizing drain on lithium backup cells during extended standby, extending system backup life significantly. |
| Power-Fail Threshold | 1.237V ±10mV at PFI, allowing accurate undervoltage detection of auxiliary rails via external resistor divider without affecting main reset path. |
| VBATT Switch Threshold | VSW = 2.40V (2.30–2.50V), triggering switchover to battery before VOUT falls below 2.0V - preserves CMOS RAM data integrity during power loss. |
Pinout & Package
MAX804RCPA+ is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, RoHS-compliant and marked with "+" suffix per ordering convention. Pin spacing is 1.27mm, body width 3.9mm, and thermal resistance θJA = 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT via internal PMOS; connects to backup battery when VCC < VSW, enabling seamless RAM retention during power failure. |
| 2 - VCC | Main power supply input | Accepts 2.72V–5.5V (for R-version); powers internal circuitry and enables VOUT-to-VCC path; must be decoupled with 0.1µF capacitor. |
| 3 - GND | Ground reference | Common return for all analog and digital functions; substrate tied to higher of VCC/VBATT - must remain floating in hybrid designs. |
| 4 - PFI | Power-fail input | Monitors auxiliary supply via external divider; asserts PFO low when voltage falls below 1.237V - used for secondary rail fault detection. |
| 5 - PFO | Power-fail output | Open-drain active-low signal; can drive MR on MAX704/MAX806 to trigger system reset upon auxiliary supply failure. |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets 1.6s timer on transition; permanently enabled - no disable option. |
| 7 - RESET | Active-high open-drain reset | Inverse of MAX690 RESET; requires external pull-up to VCC; asserts high during reset condition and after MR release or watchdog timeout. |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; may exceed VCC; connects to VOUT when VCC drops below VSW - supports 3.6V lithium coin cells directly. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1.0V | Ensures reliable reset hold during deep brownout, preventing µP from executing corrupted code even as main supply collapses. |
| Battery-backup switchover with 2.40V threshold | Engages VBATT before VOUT reaches 2.0V - meets minimum retention voltage for standard CMOS SRAM without external circuitry. |
| 200ms reset timeout with restart-on-brownout | Timer reinitializes each time VCC dips below VRST, eliminating race conditions during fluctuating supply recovery. |
| 1.237V ±10mV PFI comparator with hysteresis | Enables precise, noise-immune monitoring of secondary supplies (e.g., 5V, -12V) using simple resistor dividers - no calibration needed. |
| 40µA VCC supply current (typ) | Reduces quiescent load on primary supply, extending battery life in portable equipment where supervision must operate continuously. |
Applications
| Battery-Powered Embedded Controller | Intelligent Instrument with RAM Backup |
|---|---|
Use Scenario: Portable gas detector operating on 3.0V lithium battery with onboard SRAM storing calibration data and event logs. IC Role / Device Role / Timing Role: MAX804RCPA+ monitors VCC, triggers RESET on brownout, switches VOUT to VBATT to retain RAM, and uses WDI to detect µP lockup. Use Value: Prevents data corruption during battery depletion and ensures automatic recovery after brief power interruption - no firmware intervention required. |
Use Scenario: Handheld multimeter with nonvolatile memory and real-time clock requiring continuous backup during AC adapter disconnection. IC Role / Device Role / Timing Role: Supervises 3.3V rail, asserts RESET if supply sags, and activates VBATT-to-VOUT path within 2.40V switchover window to sustain RTC and SRAM. Use Value: Guarantees >10-year data retention with 3.6V lithium cell while eliminating need for external diode-or or LDO backup circuitry. |
| Critical µP Power Monitoring | Portable Medical Device |
Use Scenario: Industrial PLC module powered by 3.0V DC-DC converter, where unexpected reset could halt production line control logic. IC Role / Device Role / Timing Role: Provides precise 2.625V reset threshold with ±2% tolerance, 200ms timeout, and watchdog supervision to catch µP hangs. Use Value: Eliminates false resets from transient noise while ensuring deterministic response to actual supply faults - meets IEC 61000-4-4 immunity requirements. |
Use Scenario: Wearable ECG monitor using 3.3V LDO and CR2032 battery, requiring zero data loss during battery swap or charging cycles. IC Role / Device Role / Timing Role: Monitors VCC, asserts RESET during insertion/removal transients, and seamlessly transfers VOUT to VBATT without glitch. Use Value: Enables hot-swap battery replacement while preserving patient waveform buffers - critical for FDA Class II device compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX804SCPA+ | Reset threshold = 2.925V (±2%), higher trip point suitable for 3.3V ±10% systems; identical pinout, timing, and feature set. | Used where tighter supply tolerance demands earlier reset assertion - e.g., systems with fast-rising 3.3V rails prone to overshoot. | Select MAX804SCPA+ when VCC nominal is 3.3V and brownout margin must exceed 400mV; otherwise MAX804RCPA+ is optimal for 3.0V rails. |
| MAX804TCPA+ | Reset threshold = 3.075V (±2%), designed for 3.3V ±5% supplies; same SOIC-8 package and functional interface. | Preferred in legacy 3.3V systems with narrow regulation windows - e.g., FPGA configuration circuits requiring early reset hold. | Choose MAX804TCPA+ only if system VCC never falls below 3.15V under worst-case load; MAX804RCPA+ offers broader margin for aging batteries. |
Compared with MAX804SCPA+ and MAX804TCPA+, the MAX804RCPA+ provides the lowest reset threshold (2.625V), making it uniquely suited for 3.0V systems with wide tolerance or degraded battery operation - critical where extended runtime under marginal supply is required.
Availability
MAX804RCPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX804RCPA+ 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, computing, and communications markets.
The MAX804RCPA+ belongs to Maxim's µP supervisory circuit family, engineered specifically for robust power monitoring and battery backup in 3.0V/3.3V embedded systems - emphasizing precision thresholding, low quiescent current, and fail-safe watchdog behavior.
FAQ
What is the exact reset threshold voltage for MAX804RCPA+ and its tolerance?
The MAX804RCPA+ has a nominal reset threshold of 2.625V with ±2% tolerance over temperature (–40°C to +85°C). This value is specified for VCC rising and falling conditions, with 10mV hysteresis to prevent chatter during brownout recovery. The "R" suffix explicitly denotes this 2.625V variant per Maxim's ordering guide.
Does MAX804RCPA+ support battery voltage higher than VCC, and how does switchover work?
Yes, MAX804RCPA+ supports VBATT exceeding VCC - up to 6.0V - enabling direct use of 3.6V lithium cells. Switchover occurs when VCC falls below VSW = 2.40V (2.30–2.50V range), connecting VBATT to VOUT through a 140Ω internal switch. Recovery reconnects VOUT to VCC only after VCC rises above the 2.625V reset threshold.
Is the RESET output of MAX804RCPA+ active-high or active-low, and what is its drive capability?
The MAX804RCPA+ features an active-high open-drain RESET output (pin 7), inverse to the MAX690/MAX704 series. It requires an external pull-up resistor to VCC. The output sinks up to 1.2mA at VOL ≤ 0.3V and sources leakage current < ±1µA (C-grade) - compatible with standard CMOS inputs and µP reset pins.
Can the watchdog timer in MAX804RCPA+ be disabled, and what is its timeout behavior?
No, the watchdog timer in MAX804RCPA+ cannot be disabled - it is permanently enabled per Maxim's datasheet. Timeout is 1.6s (1.12–2.24s over temperature), and the timer resets on any WDI edge (rising or falling). If WDI is held static, RESET pulses every ~1.8s (tWD + tRS), ensuring fail-safe recovery even if firmware neglects WDI servicing.
What are the absolute maximum ratings for VCC and VBATT on MAX804RCPA+?
The MAX804RCPA+ has absolute maximum ratings of –0.3V to +6.0V for both VCC and VBATT pins. Exceeding these stresses may cause permanent damage. Continuous operation is rated from 2.72V to 5.5V for VCC (R-version) and up to 6.0V for VBATT, with thermal derating applied above +70°C ambient in SOIC package.
MAX804RCPA+ 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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Open Drain, Open Drain
- 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
MAX804RCPA+ FAQ
1.How can I place an order for MAX804RCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX804RCPA+ 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 MAX804RCPA+ reliable?
The price and inventory of MAX804RCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX804RCPA+ is usually 5 days.
3.What payment methods are accepted for MAX804RCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX804RCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX804RCPA+?
MAX804RCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX804RCPA+ 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 MAX804RCPA+?
For technical support, including MAX804RCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX804RCPA+ requirements.
6.How does Aetrix verify that MAX804RCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX804RCPA+ 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 MAX804RCPA+ meets industry standards.
7.What is the process for return or replacement of MAX804RCPA+?
All MAX804RCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX804RCPA+, 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 MAX804RCPA+ part is unused and in its original packaging.
Return procedure for MAX804RCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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