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Analog Devices Inc./Maxim Integrated MAX801MCPA+
- Part No.:
- MAX801MCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX801MCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:253
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Product details
Overview
MAX801MCPA+ from Maxim Integrated is a +5V microprocessor supervisory IC providing precision reset monitoring, battery switchover, low-line warning, and watchdog timer functionality. It features ±1.5% reset threshold accuracy (4.425V), 200ms reset timeout, and operates across –40°C to +85°C in an 8-pin SO package. It is used in portable/battery-powered equipment to ensure reliable µP startup and orderly shutdown during brownout.
For engineers reviewing the MAX801MCPA+ datasheet, MAX801MCPA+ pinout, MAX801MCPA+ application, or MAX801MCPA+ equivalent, this page delivers verified technical context, real-world timing behavior, battery-backup mode operation, and validated alternative options for critical power-monitoring designs.
Technical Context
The MAX801MCPA+ integrates three independent comparators - reset, low-line, and battery switchover - with internal timing logic that guarantees RESET remains asserted for ≥200ms after VCC rises above 4.425V. Its BiCMOS process enables ±1.5% threshold tolerance and 68µA typical supply current in normal operation.
It implements a 1.6s watchdog timer cleared on WDI transitions, with RESET assertion upon timeout; the active-low RESET output uses strong pull-down/weak pull-up for wire-OR compatibility, while RESET provides full CMOS drive capability. Battery switchover activates only when VCC falls below both VRST (4.425V) and VBATT, with dual PMOS switches enabling UL-recognized backup path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures µP reset before system voltage drops below safe operating range for +5V logic. |
| Reset Timeout Period | 200ms minimum - guarantees sufficient time for µP initialization and peripheral stabilization after power-up. |
| Watchdog Timeout | 1.6s typical - detects software lockup by requiring periodic WDI toggling; prevents uncontrolled execution. |
| Battery Switchover Threshold | VBATT − 0.05V to VBATT + 0.05V hysteresis - enables clean transition to backup power without oscillation during VCC decay. |
| Supply Current (Normal Mode) | 68µA typical at +25°C - minimizes quiescent drain in always-on embedded systems. |
| Operating Temperature | –40°C to +85°C - supports industrial and extended-temperature portable applications. |
| Package | 8-pin SO (Small Outline) - surface-mount compatible with automated PCB assembly and thermal performance up to 471mW. |
Pinout & Package
MAX801MCPA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 1.27mm pitch, and RoHS-compliant lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Main +5V supply input | Bypassed with 0.1µF capacitor; powers internal circuitry and drives OUT when active. |
| LOWLINE (Pin 2) | Low-voltage warning output | Active-low CMOS signal triggered 52mV above reset threshold to initiate NMI-driven shutdown. |
| RESET (Pin 3) | Active-low reset output | Strong pull-down/weak pull-up; valid down to VCC = 1V; asserts for ≥200ms after VCC recovery. |
| GND (Pin 4) | Ground reference | 0V return for all analog and digital functions; must be low-impedance connection. |
| RESET (Pin 5) | Active-high reset output | Full CMOS drive (source/sink); inverse of RESET; not wire-OR capable. |
| WDI (Pin 6) | Watchdog input | Transition-sensitive; timeout occurs if no edge within 1.6s; open-circuit disables watchdog. |
| BATT (Pin 7) | Battery backup input | Accepts 2.0V–4.5V; supplies OUT during VCC brownout; bypassed with 0.1µF capacitor. |
| OUT (Pin 8) | Output supply rail | Switches between VCC and BATT; delivers up to 250mA (VCC mode) or 20mA (battery mode). |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset detection | ±1.5% threshold tolerance over temperature - eliminates need for external trimming in high-reliability systems. |
| Guaranteed reset validity | RESET functional down to VCC = 1V - ensures fail-safe reset even during deep brownout conditions. |
| Low-line comparator | 52mV offset above reset threshold with 13mV hysteresis - provides deterministic early-warning window for controlled shutdown. |
| Battery-backup switchover | Automatic dual-PMOS switching with <12Ω on-resistance - preserves RAM data with minimal voltage drop during power loss. |
| Watchdog timer | 1.6s timeout with edge-triggered clear - detects stalled firmware without requiring dedicated clock source. |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered handheld diagnostic instruments requiring guaranteed boot integrity and graceful shutdown during battery depletion. IC Role / Device Role / Timing Role: Supervisory IC providing reset assertion, low-line NMI, and battery-backed RAM retention during main supply collapse. Use Value: Prevents corrupted memory writes and undefined µP states by enforcing 200ms reset hold time and initiating shutdown 52mV before reset threshold breach. |
Use Scenario: DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings and intermittent AC line faults. IC Role / Device Role / Timing Role: Power-monitoring supervisor ensuring deterministic µP restart after brownout and maintaining I/O state via battery-backed RAM. Use Value: Enables uninterrupted operation through transient dips using ±1.5% reset accuracy and –40°C to +85°C rated SO package. |
| Smart Energy Meters | Embedded Telematics Units |
Use Scenario: Utility-grade electricity meters with supercapacitor backup, requiring precise voltage monitoring to log last-read data before power loss. IC Role / Device Role / Timing Role: Voltage supervisor triggering LOWLINE interrupt for EEPROM write completion and asserting RESET to halt processing before VCC collapse. Use Value: Guarantees data integrity with 18µs CE-gate hold (MAX808 variant) and MaxCap™/SuperCap™ compatibility for long-term backup. |
Use Scenario: Automotive-grade telematics modules powered from vehicle battery with risk of ignition-cycle voltage transients and load-dump events. IC Role / Device Role / Timing Role: Reset controller detecting VCC dips below 4.425V and suppressing false resets via glitch immunity (≤3µs @ 40mV overdrive). Use Value: Maintains communication stack stability using 200ms reset timeout and robust reset comparator propagation delay (<40µs over temperature). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX808MCPA+ | No watchdog timer; adds chip-enable gating (CE IN/CE OUT) and RAM write-cycle completion (18µs hold). | Better suited for systems requiring hardware-enforced RAM write protection during power failure. | Select MAX808MCPA+ when CE gating and write-cycle completion are required; MAX801MCPA+ when watchdog supervision is essential. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no battery switchover or LOWLINE output; 200ms timeout; SOT-23-6 package. | Designed for single-supply 3.3V systems without backup power requirements. | Choose TPS3808G33DBVR only for 3.3V-only applications lacking battery backup or low-line warning needs. |
Compared with MAX808MCPA+, MAX801MCPA+ provides watchdog supervision but lacks CE gating; compared with TPS3808G33DBVR, it supports +5V operation, battery switchover, and dual reset outputs - making it uniquely suitable for portable +5V systems requiring full brownout resilience.
Availability
MAX801MCPA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, smart energy meters, and embedded telematics units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX801MCPA+ 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, sensing, and interface applications, with emphasis on reliability and integration for demanding environments.
The MAX801MCPA+ belongs to Maxim's µP supervisory product line, engineered specifically for +5V microprocessor systems needing high-accuracy reset, battery backup, and watchdog safety - targeting portable, industrial, and metering applications.
FAQ
What is the exact reset threshold voltage for MAX801MCPA+?
The MAX801MCPA+ has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature and supply voltage. This value is fixed by the "M" suffix and confirmed in the Electrical Characteristics table under VRST for MAX80_M variants. The threshold remains stable across –40°C to +85°C, with typical drift less than 10mV over full temperature range per the RESET THRESHOLD vs. TEMPERATURE graph.
Does MAX801MCPA+ support battery backup, and what are its limits?
Yes, MAX801MCPA+ supports battery backup via the BATT pin (Pin 7) and OUT pin (Pin 8). It automatically switches OUT from VCC to BATT when VCC falls below both the reset threshold (4.425V) and VBATT. In battery-backup mode, it delivers up to 20mA with ~12Ω on-resistance, and draws ≤1µA standby current from the battery - verified in the Electrical Characteristics table under "Supply Current in Battery-Backup Mode".
How does the watchdog timer in MAX801MCPA+ operate?
The MAX801MCPA+ watchdog timer asserts RESET if the WDI pin (Pin 6) remains static for >1.6s. It clears on any rising or falling edge while RESET is deasserted, and pauses while RESET is active. Leaving WDI unconnected disables the function via internal voltage divider biasing. This behavior is documented in the "MAX801 Watchdog Timer" section and confirmed by timing diagram Figure 5 showing tWD = 1.6s and reset retriggering on WDI transitions.
Can MAX801MCPA+ be used with SuperCap™ or MaxCap™ devices?
Yes, MAX801MCPA+ is explicitly MaxCap™/SuperCap™ compatible per the Features list and Applications Information section. Its battery switchover threshold hysteresis (VBATT ±0.05V) and ability to accept VBATT > VCC enable direct use with large-value capacitors like 0.47F SuperCaps. Figure 8 shows a validated schematic using a 0.47F SuperCap with 1N4148 charging diode and 0.1µF bypass at BATT.
What is the purpose of the LOWLINE output on MAX801MCPA+?
The LOWLINE output (Pin 2) is an active-low comparator signal triggered when VCC falls to 52mV above the reset threshold (i.e., 4.477V for MAX801MCPA+). It provides a non-maskable interrupt (NMI) to initiate orderly software shutdown before reset occurs. Its 13mV hysteresis prevents chatter, and propagation delay is ≤17µs - values confirmed in the Electrical Characteristics table under VLL, VLR, and tLL parameters.
MAX801MCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.425V
- Output:
- -
- 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
MAX801MCPA+ FAQ
1.How can I place an order for MAX801MCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX801MCPA+ 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 MAX801MCPA+ reliable?
The price and inventory of MAX801MCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX801MCPA+ is usually 5 days.
3.What payment methods are accepted for MAX801MCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX801MCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX801MCPA+?
MAX801MCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX801MCPA+ 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 MAX801MCPA+?
For technical support, including MAX801MCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX801MCPA+ requirements.
6.How does Aetrix verify that MAX801MCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX801MCPA+ 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 MAX801MCPA+ meets industry standards.
7.What is the process for return or replacement of MAX801MCPA+?
All MAX801MCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX801MCPA+, 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 MAX801MCPA+ part is unused and in its original packaging.
Return procedure for MAX801MCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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