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Analog Devices Inc./Maxim Integrated MAX800LCPE+
- Part No.:
- MAX800LCPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX800LCPE+.pdf
- Description:
- IC MPU SUPERVISORY CIRCUIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
The MAX800LCPE+ from Maxim Integrated is a microprocessor supervisory circuit designed for critical 5V power monitoring and system reset control in embedded controllers and intelligent instruments. It features a 4.65V typical reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and guaranteed RESET assertion down to VCC = 1V - enabling reliable brownout protection in battery-backed systems.
For engineers reviewing the MAX800LCPE+ datasheet, MAX800LCPE+ pinout, MAX800LCPE+ application, or MAX800LCPE+ equivalent, key selection considerations include its ±2% power-fail accuracy, dual RESET/RESET outputs (active-low and active-high), chip-enable gating with ≤10ns propagation delay, and support for MaxCap®/SuperCap™ backup capacitors in industrial-grade plastic DIP packaging.
Technical Context
The MAX800LCPE+ integrates a precision voltage monitor, watchdog timer with selectable timeout (100ms or 1.6s), internal oscillator or external clock option via OSC SEL/OSC IN, and bidirectional power switchover logic between VCC and VBATT. Its dual-reset architecture includes an open-drain RESET and push-pull RESET output, both asserted when VCC falls below 4.65V (typ) and held active for 200ms after recovery.
It implements chip-enable signal gating using a low-resistance transmission gate (75–150Ω), supports battery switchover with hysteresis (60mV), and provides independent power-fail detection via PFI/PFO with 1.25V threshold and ±25nA leakage - all while maintaining valid operation across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.65V typical; ensures deterministic μP reset at precise 5V rail collapse point |
| Reset Timeout Period | 200ms typical on power-up; prevents premature code execution during rail stabilization |
| Supply Current (Operating) | 30μA typical; enables long-term battery backup without significant drain |
| Power-Fail Accuracy | ±2% guaranteed; supports accurate low-battery warning and early power-fail detection |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω (MAX800_C); minimizes dropout under 250mA load in main supply mode |
| VBATT-to-VOUT On-Resistance | 15–30Ω; limits current delivery in battery-backup mode to protect small-capacity sources |
| Chip-Enable Propagation Delay | 6–10ns; preserves timing integrity for high-speed memory access during fault conditions |
Pinout & Package
MAX800LCPE+ is housed in a 16-pin plastic DIP package (0.300" wide), RoHS-compliant with + symbol suffix, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Connects to backup capacitor or battery; enables seamless switchover when VCC drops below reset threshold |
| 2 VOUT | Output Supply Voltage | Switched output sourced from VCC or VBATT; powers downstream logic and serves as reference for internal comparators |
| 3 VCC | Main Supply Input | 5V regulated input; monitored for reset assertion and used as primary source for VOUT |
| 4 GND | Ground Reference | 0V return path for all analog and digital functions; decoupling capacitor required at VOUT–GND |
| 5 BATT ON | Battery-On Status Output | Open-collector high-active signal indicating VBATT is active; drives external PNP base for >250mA loads |
| 6 LOW LINE | Reset Comparator Buffer | Active-low buffered copy of reset comparator output; used for system status indication without loading RESET |
| 7 OSC IN | Oscillator Timing Input | Accepts external capacitor or clock signal to set watchdog/reset timeout periods; internal ±100nA current source |
| 8 OSC SEL | Oscillator Mode Select | Configures internal vs. external timing: floating = internal 1.6s/200ms, grounded = external capacitor/clock mode |
| 9 PFI | Power-Fail Input | Non-inverting input to uncommitted comparator; threshold fixed at 1.25V for low-battery or early power-fail detection |
| 10 PFO | Power-Fail Output | Active-low comparator output; sinks 3.2mA at 0.1V; independent of reset/watchdog logic |
| 11 WDI | Watchdog Input | Three-level input (high/mid/low); transition resets watchdog timer; floating = mid-supply = watchdog disabled |
| 12 CE OUT | Chip-Enable Output | Gated CE signal passed only when VCC > reset threshold; prevents RAM corruption during brownout |
| 13 CE IN | Chip-Enable Input | High-impedance when reset asserted; series 75Ω resistance in enabled mode for minimal signal distortion |
| 14 WDO | Watchdog Output | Active-low watchdog fault indicator; goes low if WDI stalls longer than timeout; returns high on next transition |
| 15 RESET | Active-Low Reset Output | Open-drain output asserted low during reset; valid down to VCC = 1V; requires external pull-up |
| 16 RESET | Active-High Reset Output | Push-pull output inverse of RESET; guaranteed high/low states without external components |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | Simultaneous active-low (open-drain) and active-high (push-pull) RESET signals ensure compatibility with diverse μP reset architectures |
| ±2% Power-Fail Accuracy | Enables precise low-battery warning and predictive power-fail response without calibration or trimming |
| Chip-Enable Gating | Prevents erroneous writes to CMOS RAM during power failure by disabling CE path within 15µs of reset assertion |
| MaxCap®/SuperCap™ Compatible | Supports large-value backup capacitors (e.g., 0.47F) with controlled switchover and low-leakage standby mode |
| Guaranteed Operation to VCC = 1V | Ensures valid RESET assertion and internal logic state retention even during deep brownout conditions |
| Selectably Programmable Watchdog | Configurable 100ms or 1.6s timeout via OSC SEL/OSC IN; external capacitor or clock option adds design flexibility |
Applications
| Industrial Controller Monitoring | Intelligent Instrument Power Management |
|---|---|
|
Use Scenario: PLCs and remote I/O modules requiring fail-safe restart after AC line interruption or undervoltage events. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET for 200ms after VCC recovery, gating CE to prevent corrupted register writes during brownout. Use Value: Eliminates firmware lockups and data corruption by ensuring deterministic μP initialization and memory write blocking during unstable supply conditions. |
Use Scenario: Portable test equipment with nonvolatile memory and real-time clock, powered from mains with supercapacitor backup. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 5V rail for reset, switches VOUT to VBATT on failure, and asserts BATT ON to enable RTC power path. Use Value: Enables uninterrupted timekeeping and configuration retention for ≥72 hours on 0.47F MaxCap®, with ±2% PFI accuracy for low-battery alerting. |
| Critical μP Power Monitoring | Embedded Computer System Reset Control |
|
Use Scenario: Medical diagnostic devices where unexpected reset could compromise patient safety or data integrity. IC Role / Device Role / Timing Role: Primary reset generator with guaranteed VCC = 1V operation, dual RESET outputs for redundant reset paths, and watchdog supervision of firmware health. Use Value: Meets IEC 62304 Class C requirements by providing fail-operational reset assurance and watchdog-enforced software liveness checks. |
Use Scenario: Network edge gateway with Ethernet PHY, flash memory, and ARM Cortex-M7 processor running real-time OS. IC Role / Device Role / Timing Role: Centralized power supervisor coordinating reset sequencing, CE gating for flash access, and PFO-triggered graceful shutdown on impending power loss. Use Value: Prevents flash write corruption during power interruption and enables safe filesystem sync before shutdown via PFI-driven interrupt. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SCPA+ | Simpler 3-pin SOT23 supervisor; single reset output, no watchdog, no CE gating, no battery switchover | Only suitable for basic reset-only applications without backup power or memory protection needs | Select MAX809SCPA+ only when cost and board space outweigh need for dual reset, watchdog, or battery management |
| TPS3823MPWPT | Texas Instruments part; 4.63V reset threshold, 200ms timeout, but lacks VBATT switchover, CE gating, and PFI/PFO comparator | Cannot replace MAX800LCPE+ in battery-backed systems or those requiring memory write protection during brownout | Choose TPS3823MPWPT only for standard 5V reset supervision where backup power and CE control are unnecessary |
Compared with MAX800LCPE+, MAX809SCPA+ omits all advanced supervision features (watchdog, CE gating, battery switchover), while TPS3823MPWPT retains core reset functionality but removes critical subsystems needed for robust embedded power management - making MAX800LCPE+ uniquely suited for safety-critical, battery-backed μP systems.
Availability
MAX800LCPE+ is available at Aetrix Electronics and suitable for industrial controller monitoring, intelligent instrument power management, and critical μP power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for MAX800LCPE+ 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, automotive, and communications markets.
The MAX800L family was engineered specifically for robust microprocessor supervision in harsh environments - delivering precision reset thresholds, battery switchover, watchdog protection, and memory write safeguarding in a single 16-pin package.
FAQ
What is the reset threshold voltage of the MAX800LCPE+ and how does it behave over temperature?
The MAX800LCPE+ has a typical reset threshold voltage of 4.65V, with guaranteed minimum 4.50V and maximum 4.75V across the full -40°C to +85°C operating range. Its reset threshold hysteresis is 15mV, preventing chatter near the trip point. The device maintains this specification without external components, and typical variation over temperature is ±15mV, as confirmed in Figure MAX691A toc07 of the datasheet.
Does the MAX800LCPE+ support battery backup, and what are the voltage and current limits for VBATT?
Yes, the MAX800LCPE+ supports battery backup via the VBATT pin. It switches to VBATT when VCC falls below the reset threshold and VBATT exceeds VCC by >0.3V. VBATT accepts 2.0V to 5.5V, with continuous current limited to 25mA and peak (transient) current up to 250mA. The VBATT-to-VOUT on-resistance ranges from 15Ω (at 4.5V) to 30Ω (at 2.0V), ensuring predictable dropout in backup mode.
How does the watchdog function work on the MAX800LCPE+, and can it be disabled?
The MAX800LCPE+ watchdog monitors the WDI pin: if WDI remains static (high or low) beyond the timeout period (100ms or 1.6s), WDO goes low and RESET/RESET are asserted for 200ms. The watchdog is disabled by leaving WDI floating - its internal voltage divider biases it to ~1.6V, which the internal comparators recognize as invalid, halting watchdog operation. No external components are needed for disable.
What is the purpose of the CE IN and CE OUT pins on the MAX800LCPE+, and how do they operate during reset?
The CE IN and CE OUT pins implement chip-enable signal gating to prevent memory corruption during power faults. During normal operation, CE IN passes directly to CE OUT with ≤10ns delay. When RESET is asserted, CE IN enters high-impedance mode within 15µs, and CE OUT is actively pulled high to VOUT - blocking all CE transitions to CMOS RAM or EEPROM and eliminating spurious writes during brownout.
Can the MAX800LCPE+ generate accurate power-fail warnings, and what is the PFI/PFO accuracy specification?
Yes, the MAX800LCPE+ provides highly accurate power-fail detection via its dedicated PFI/PFO comparator. The PFI threshold is precisely 1.25V (±25mV), and the device guarantees ±2% accuracy for power-fail detection - meaning the actual trip point stays within 1.225V to 1.275V at VCC = 5V. This enables reliable low-battery alerts and early power-loss prediction without calibration.
MAX800LCPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Open Drain, Push-Pull
- 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:
- 16-PDIP
MAX800LCPE+ FAQ
1.How can I place an order for MAX800LCPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX800LCPE+ 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 MAX800LCPE+ reliable?
The price and inventory of MAX800LCPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX800LCPE+ is usually 5 days.
3.What payment methods are accepted for MAX800LCPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX800LCPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX800LCPE+?
MAX800LCPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX800LCPE+ 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 MAX800LCPE+?
For technical support, including MAX800LCPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX800LCPE+ requirements.
6.How does Aetrix verify that MAX800LCPE+ is sourced from the original manufacturer or authorized distributors?
All MAX800LCPE+ 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 MAX800LCPE+ meets industry standards.
7.What is the process for return or replacement of MAX800LCPE+?
All MAX800LCPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX800LCPE+, 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 MAX800LCPE+ part is unused and in its original packaging.
Return procedure for MAX800LCPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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