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Analog Devices Inc./Maxim Integrated MAX801LCPA+
- Part No.:
- MAX801LCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX801LCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX801LCPA+ from Maxim Integrated is a +5V microprocessor supervisory IC providing precision reset generation, battery switchover, low-line warning (NMI), and watchdog timer functionality. It features ±1.5% reset threshold accuracy (4.675V), 200ms reset timeout, and operates across 0°C to +70°C in an 8-pin plastic DIP package. It is used in portable/battery-powered equipment requiring reliable power-fail detection and RAM backup.
For engineers reviewing the MAX801LCPA+ datasheet, MAX801LCPA+ pinout, MAX801LCPA+ application, or MAX801LCPA+ equivalent, this page delivers verified functional roles, validated timing behavior, confirmed battery-switchover thresholds, and real-world design constraints for brownout recovery, NMI-driven shutdown, and watchdog-integrated firmware safety.
Technical Context
The MAX801LCPA+ integrates three independent comparators: a reset comparator with 4.675V threshold and ±1.5% accuracy, a low-line comparator set 52mV above reset (4.727V), and a battery switchover comparator with 50mV hysteresis. Its BiCMOS process enables 68µA typical supply current in normal mode and guarantees RESET validity down to VCC = 1V.
It implements a 1.6s watchdog timeout with transition-triggered reset clearing, and provides dual active outputs: open-drain RESET (strong pull-down/weak pull-up) and CMOS RESET (bidirectional drive). The WDI input disables automatically when left floating due to an internal voltage divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.675V ±1.5% - ensures deterministic µP reset before system logic becomes unreliable under brownout. |
| Reset Timeout | 200ms minimum - guarantees sufficient time for µP initialization and peripheral stabilization after power recovery. |
| Low-Line Threshold | 4.727V (52mV above reset) - triggers NMI for orderly software shutdown before reset occurs. |
| Watchdog Timeout | 1.6s typical - detects stalled firmware execution and forces safe recovery without external components. |
| Battery Switchover | VCC < VBATT and VCC < 4.675V - enables automatic RAM backup with ≤1µA standby battery current. |
| Supply Current | 68µA typical at VCC = 5V - supports long battery life in portable systems during normal operation. |
| Operating Temp | 0°C to +70°C - qualified for commercial embedded applications including controllers and intelligent instruments. |
Pinout & Package
MAX801LCPA+ is housed in an 8-pin plastic DIP (dual in-line package) with through-hole mounting and 0.3-inch body width. Pin 1 is marked with a notch or dot; pins are numbered counterclockwise from the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Primary supply input | Nominally +5V main power rail; bypassed with 0.1µF capacitor to GND for noise immunity. |
| 2: LOWLINE | Low-line comparator output | Active-low CMOS signal indicating VCC has fallen to 4.727V; used to trigger NMI for controlled shutdown. |
| 3: RESET | Active-low reset output | Open-drain-compatible output guaranteed valid down to VCC = 1V; asserts for ≥200ms after VCC rises above 4.675V. |
| 4: GND | Ground reference | 0V return path for all internal circuitry and external decoupling capacitors. |
| 5: RESET | Active-high reset output | CMOS output sourcing/sinking current; inverse of RESET; not wire-OR capable. |
| 6: WDI | Watchdog input | Transition-sensitive input; unconnected state disables watchdog via internal mid-supply bias. |
| 7: BATT | Battery backup input | Accepts 2.8V–6V backup source; enables switchover when VCC falls below both VBATT and 4.675V. |
| 8: OUT | Output supply rail | Delivers power to CMOS RAM; sourced from VCC or BATT depending on switchover conditions; bypassed with 0.1µF. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | ±1.5% threshold accuracy over temperature eliminates need for external trimming in critical power-monitoring designs. |
| Guaranteed RESET validity to VCC = 1V | Enables robust reset assertion even during deep brownout, ensuring µP remains held until stable supply returns. |
| Integrated watchdog timer | 1.6s timeout with edge-triggered clearing allows firmware-level execution monitoring without external RC timing. |
| Low-line NMI generation | 52mV offset above reset threshold provides deterministic early-warning window for software-initiated shutdown before reset. |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) with no external charging circuitry or voltage clamping required. |
Applications
| Portable/Battery-Powered Equipment | Critical µP Power Monitoring |
|---|---|
Use Scenario: Handheld data loggers operating from single-cell Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Supervisory IC monitors VCC decay, asserts LOWLINE at 4.727V to initiate flash memory save, then asserts RESET at 4.675V if voltage continues falling. Use Value: Prevents data corruption by enabling deterministic, two-stage power-fail response with 52mV guardband between warning and reset. |
Use Scenario: Industrial PLC controller requiring fail-safe boot sequence and runtime watchdog enforcement. IC Role / Device Role / Timing Role: Generates 200ms power-on reset pulse and monitors firmware liveness via WDI transitions; resets µP on 1.6s timeout. Use Value: Eliminates need for discrete RC reset circuits and external watchdog ICs, reducing BOM count and layout area. |
| Computers | Embedded Systems |
Use Scenario: Legacy x86-based industrial computer with CMOS SRAM retaining BIOS configuration. IC Role / Device Role / Timing Role: Provides battery-backed VOUT rail and gates CE signals during power loss to prevent partial writes to SRAM. Use Value: Ensures RAM integrity during brownout by holding CE enabled for 18µs to complete ongoing write cycles. |
Use Scenario: Medical infusion pump with safety-critical firmware requiring guaranteed startup state and runtime supervision. IC Role / Device Role / Timing Role: Delivers precise 4.675V reset threshold and validates RESET down to VCC = 1V to maintain hold condition during transient dips. Use Value: Meets IEC 62304 Class C software safety requirements by enforcing deterministic reset behavior under marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX808LCPA+ | Lacks watchdog timer and RESET output; adds chip-enable gating (CE IN/CE OUT) and RAM write-cycle completion. | Optimized for systems requiring CMOS RAM write protection during power failure, not firmware execution monitoring. | Select MAX808LCPA+ when CE gating and write-cycle hold are required, and watchdog functionality is unnecessary. |
| TPS3808G18DBVR | Fixed 1.8V reset threshold, no battery switchover, no LOWLINE/NMI output, no watchdog; 360ms reset timeout. | Designed for low-voltage µPs (1.8V core), not +5V legacy systems; lacks dual-supply support and early-warning capability. | Choose TPS3808G18DBVR only for new 1.8V designs where battery backup and NMI are not required. |
Compared with MAX808LCPA+, MAX801LCPA+ provides essential watchdog supervision but omits CE gating; compared with TPS3808G18DBVR, it supports +5V operation, battery switchover, and dual-reset signaling-making it irreplaceable in legacy portable and industrial µP systems requiring full-feature power management.
Availability
MAX801LCPA+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical µP power monitoring, and embedded systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical, industrial, and aerospace programs.
Supply support for MAX801LCPA+ 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, communications, and computing applications.
The MAX801LCPA+ belongs to Maxim's µP supervisory product line, designed specifically for +5V microprocessor systems needing precision reset, battery backup, and watchdog safety in space-constrained, battery-operated environments.
FAQ
What is the exact reset threshold voltage of the MAX801LCPA+?
The MAX801LCPA+ has a nominal reset threshold voltage of 4.675V with ±1.5% accuracy over temperature and supply variation. This value is factory-trimmed and specified in the Electrical Characteristics table under VRST parameter. The 'L' suffix in MAX801LCPA+ explicitly denotes the 4.675V threshold variant, distinguishing it from the 'M' (4.425V) and 'N' (4.575V) versions. This precision eliminates need for external resistor dividers in most +5V applications.
Does the MAX801LCPA+ support battery backup for CMOS RAM?
Yes, the MAX801LCPA+ supports battery backup for CMOS RAM via its BATT and OUT pins. When VCC falls below both the reset threshold (4.675V) and VBATT, the device automatically switches the OUT rail from VCC to the battery source. It delivers up to 20mA from the battery in backup mode with ≤1µA standby current, and is compatible with MaxCap™ and SuperCap™ technologies for extended hold-up time without external charging circuitry.
How does the watchdog timer in the MAX801LCPA+ function?
The MAX801LCPA+ watchdog timer asserts RESET if the WDI input remains static (high or low) for longer than 1.6 seconds. A rising or falling edge on WDI clears the internal timer, provided RESET is not currently asserted. The timer restarts immediately upon RESET deassertion. Leaving WDI unconnected disables the watchdog via an internal voltage divider that biases it near mid-supply - a key design feature confirmed in the datasheet's Note 4.
Can the MAX801LCPA+ generate a non-maskable interrupt (NMI)?
Yes, the MAX801LCPA+ generates a dedicated NMI-capable signal via its LOWLINE output. LOWLINE goes low when VCC falls to 4.727V - precisely 52mV above the 4.675V reset threshold - providing a deterministic early warning window. This allows firmware to execute an orderly shutdown routine before RESET is asserted, a capability explicitly documented in the Applications Information and Typical Operating Circuit sections of the datasheet.
What package type and lead finish does the MAX801LCPA+ use?
The MAX801LCPA+ uses an 8-pin plastic DIP (dual in-line package) with through-hole mounting and 0.3-inch body width. The '+' symbol in the part number indicates lead-free (RoHS-compliant) finish per Maxim's ordering convention. This is confirmed in the Ordering Information section, which states: "Specify lead free by adding the + symbol at the end of the part number when ordering." Lead-free packaging is available for PDIP and SO packages but not for CERDIP.
MAX801LCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.675V
- 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
MAX801LCPA+ FAQ
1.How can I place an order for MAX801LCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX801LCPA+ 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 MAX801LCPA+ reliable?
The price and inventory of MAX801LCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX801LCPA+ is usually 5 days.
3.What payment methods are accepted for MAX801LCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX801LCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX801LCPA+?
MAX801LCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX801LCPA+ 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 MAX801LCPA+?
For technical support, including MAX801LCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX801LCPA+ requirements.
6.How does Aetrix verify that MAX801LCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX801LCPA+ 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 MAX801LCPA+ meets industry standards.
7.What is the process for return or replacement of MAX801LCPA+?
All MAX801LCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX801LCPA+, 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 MAX801LCPA+ part is unused and in its original packaging.
Return procedure for MAX801LCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX801LCPA+ Tags
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MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
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APX803L20-29SA-7
Diodes Incorporated
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MCP130T-315I/TT
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