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Analog Devices Inc./Maxim Integrated MAX800LEPE+
- Part No.:
- MAX800LEPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX800LEPE+.pdf
- Description:
- POWER SUPPLY MANAGEMENT CIRCUIT,
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
MAX800LEPE+ from Maxim Integrated is a microprocessor supervisory circuit with 4.65V reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and integrated battery switchover for CMOS RAM backup. It monitors VCC in 5V systems, asserts RESET down to 1V, and provides CE gating, watchdog, and power-fail detection for embedded controllers.
For engineers reviewing the MAX800LEPE+ datasheet, MAX800LEPE+ pinout, MAX800LEPE+ application, or MAX800LEPE+ equivalent, key selection criteria include guaranteed ±2% power-fail accuracy, VCC-to-VOUT on-resistance ≤1.2Ω, battery-backup mode operation at VBATT ≥2.0V, and compatibility with MaxCap®/SuperCap™ backup capacitors.
Technical Context
The MAX800LEPE+ integrates a precision voltage monitor (4.65V ±15mV hysteresis), an internal oscillator setting 200ms reset timeout and 1.6s watchdog period, and bidirectional power-path control between VCC and VBATT via low-RDS(ON) PMOS switches. Its dual RESET/RESET outputs support both active-low and active-high μP reset inputs.
Chip-enable gating uses a 75Ω transmission gate with ≤10ns propagation delay (50Ω source, 50pF load); the power-fail comparator (PFI/PFO) operates independently with 1.25V threshold and ±25nA leakage, while WDI implements three-level watchdog input with 100ns minimum pulse width detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V typical (±15mV hysteresis); ensures reliable reset assertion during 5V supply brownout. |
| Reset Timeout | 200ms typical after power-up; guarantees μP initialization completes before release. |
| VCC Supply Current | 30μA typical (normal mode); enables low-power operation in always-on monitoring circuits. |
| VCC-to-VOUT RON | 0.8–1.2Ω max; limits voltage drop to ≤200mV at 250mA load, preserving system rail integrity. |
| Power-Fail Accuracy | ±2% guaranteed (MAX800L variant); supports precise low-battery warning without external calibration. |
| Watchdog Timeout | 1.6s nominal long period; detects μP lockup in real-time control loops with minimal false triggers. |
| Battery Switchover | VCC < VBATT − 0.3V (power-down); enables seamless transition to backup power below reset threshold. |
Pinout & Package
MAX800LEPE+ is supplied 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 | Accepts 2.0–5.5V backup source; enables VOUT sourcing from battery when VCC fails. |
| 2 VOUT | Output Supply Voltage | Main system supply output; connects to VCC or VBATT depending on switchover state. |
| 3 VCC | Main Supply Input | 5V regulated input; monitored for reset assertion and CE gating enable/disable logic. |
| 4 GND | Ground Reference | 0V reference for all analog comparators, digital logic, and output drivers. |
| 5 BATT ON | Battery-On Indicator | Open-drain output high when VBATT powers VOUT; used to drive PNP base for >250mA loads. |
| 6 LOW LINE | Reset Comparator Output | Buffered active-low signal mirroring reset threshold crossing; sinks 3.2mA at 0.1V. |
| 7 OSC IN | Oscillator Timing Input | Accepts external capacitor or clock; sets reset/watchdog timing when OSC SEL = GND. |
| 8 OSC SEL | Oscillator Mode Select | High = internal oscillator (200ms/1.6s); low = external timing control via OSC IN. |
| 9 PFI | Power-Fail Input | Non-inverting comparator input; 1.25V threshold triggers PFO for early brownout warning. |
| 10 PFO | Power-Fail Output | Open-drain output low when PFI < 1.25V; independent of reset logic, usable for alarms. |
| 11 WDI | Watchdog Input | Three-level input (high/mid/low); reset timer clears on any 100ns+ transition. |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; disabled during reset to prevent RAM corruption during power failure. |
| 13 CE IN | Chip-Enable Input | High-impedance when reset asserted; series 75Ω resistance when enabled. |
| 14 WDO | Watchdog Output | Active-low watchdog status; goes low on timeout and remains low until next WDI edge. |
| 15 RESET | Active-Low Reset Output | Open-drain output valid down to VCC = 1V; requires external pullup for μP reset input. |
| 16 RESET | Active-High Reset Output | Open-drain inverse of RESET; high-impedance when inactive, pulled to VOUT when active. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Enables robust reset signaling even during deep brownout, eliminating need for external supervisor fallback. |
| ±2% power-fail accuracy (MAX800L) | Supports accurate low-battery detection without trimming resistors or calibration firmware. |
| MaxCap®/SuperCap™ compatible backup | Allows use of large-value backup capacitors instead of batteries, reducing size, cost, and maintenance. |
| On-board CE signal gating (≤10ns delay) | Prevents spurious writes to CMOS RAM during power transitions without adding external logic. |
| VCC-to-VOUT on-resistance ≤1.2Ω | Minimizes dropout under full 250mA load, maintaining stable VOUT for downstream peripherals. |
| Independent power-fail comparator (PFI/PFO) | Provides early warning capability without affecting reset timing or watchdog behavior. |
Applications
| Industrial PLC Controller | Medical Patient Monitor |
|---|---|
Use Scenario: Maintains volatile configuration memory and real-time clock during AC mains interruption or battery swap. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC monitoring, battery switchover, and RAM write protection. Use Value: Prevents data loss and system crash by asserting RESET before VCC drops below μP operational range and enabling seamless VBATT takeover. |
Use Scenario: Ensures safe shutdown and nonvolatile storage of vital patient parameters during unexpected power loss. IC Role / Device Role / Timing Role: Dual-reset generator with watchdog supervision and power-fail warning for critical life-support subsystems. Use Value: Guarantees 200ms reset hold time for orderly firmware save and disables CE during brownout to avoid corrupted EEPROM writes. |
| Telecom Base Station Management | Automotive Telematics Unit |
Use Scenario: Monitors 5V management rail in remote radio units exposed to wide temperature swings and transient surges. IC Role / Device Role / Timing Role: Precision voltage supervisor with ±2% PFI accuracy and −40°C to +85°C operation. Use Value: Delivers reliable power-fail detection across temperature, eliminating false alarms that could trigger unnecessary failover. |
Use Scenario: Provides cold-cranking resilience and backup power management for GPS/ECU communication modules. IC Role / Device Role / Timing Role: Battery-backed supervisory IC with VCC/VBATT switchover and watchdog for CAN bus interface stability. Use Value: Asserts RESET down to 1V during engine cranking dips, ensuring μP remains held until stable 5V resumes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691AEPE+ | Same 4.65V reset threshold and 200ms timeout, but lacks ±2% power-fail accuracy guarantee and has higher 100μA operating current. | Not suitable where precise low-battery warning is required; acceptable for basic reset-only functions. | Select MAX691AEPE+ only if power-fail comparator accuracy is not needed and lower cost is prioritized. |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no battery switchover or CE gating; 2.5μA quiescent current but single-function design. | Cannot replace MAX800LEPE+ in battery-backed RAM applications or systems requiring CE protection. | Choose TPS3808G33DBVR only for simple 3.3V supply monitoring without backup or interface protection. |
Compared with MAX691AEPE+, MAX800LEPE+ adds guaranteed ±2% PFI accuracy and lower 30μA supply current; versus TPS3808G33DBVR, it delivers full supervisory functionality-reset, watchdog, CE gating, and battery switchover-in a single 5V-compatible device.
Availability
MAX800LEPE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical patient monitors, telecom base station management units, and automotive telematics systems requiring stable component supply across extended temperature ranges.
Supply support for MAX800LEPE+ 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 connectivity applications in industrial, medical, and communications markets.
The MAX800L family targets 5V microprocessor systems needing integrated reset, watchdog, battery switchover, and power-fail warning-all in one compact supervisory IC.
FAQ
What is the guaranteed reset threshold voltage for MAX800LEPE+?
The MAX800LEPE+ has a guaranteed reset threshold voltage of 4.65V typical, with a minimum of 4.50V and maximum of 4.75V across temperature and supply conditions. This specification ensures consistent reset assertion during 5V supply brownout events, and the 15mV hysteresis prevents chatter near the threshold. The MAX800LEPE+ datasheet confirms this value applies specifically to the MAX800L variant, distinguishing it from the 4.4V threshold of the MAX800M.
Does MAX800LEPE+ support battery backup for CMOS RAM?
Yes, MAX800LEPE+ supports battery backup for CMOS RAM through its integrated VBATT switchover function. When VCC falls below the reset threshold and below VBATT, the device automatically connects VBATT to VOUT, sustaining power to RAM. The BATT ON output signals switchover status, and the IC guarantees operation with VBATT as low as 2.0V. MAX800LEPE+ also includes write-protection gating of CE signals to prevent corruption during transitions.
What is the maximum continuous current supported by MAX800LEPE+ on the VOUT pin?
The MAX800LEPE+ supports a maximum continuous current of 250mA on the VOUT pin when powered from VCC, with VCC-to-VOUT on-resistance specified at 0.8–1.2Ω. At 250mA, the typical voltage drop is ≤200mV. For battery-backup mode, VBATT-to-VOUT continuous current is limited to 25mA due to higher on-resistance (~15–30Ω). Exceeding these ratings risks permanent damage, as the device lacks short-circuit protection.
How does the watchdog function operate in MAX800LEPE+?
The MAX800LEPE+ watchdog monitors the WDI pin and asserts RESET and WDO if no transition occurs within the timeout period-1.6s nominal for long period, 100ms for short period. A 100ns minimum pulse width resets the timer. Leaving WDI unconnected disables the watchdog via internal 1.6V bias. During reset assertion or battery-backup mode, the watchdog is automatically disabled, ensuring predictable behavior during power faults.
Is MAX800LEPE+ compatible with MaxCap® or SuperCap™ backup capacitors?
Yes, MAX800LEPE+ is explicitly designed for compatibility with MaxCap® and SuperCap™ backup capacitors, as stated in its features list and typical operating circuit. Its low 30μA operating current and optimized VBATT interface allow direct connection to large-value capacitors (e.g., 0.47F) without external charge control circuitry. This eliminates the need for batteries in many applications, reducing size, cost, and maintenance requirements.
MAX800LEPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX800LEPE+ FAQ
1.How can I place an order for MAX800LEPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX800LEPE+ 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 MAX800LEPE+ reliable?
The price and inventory of MAX800LEPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX800LEPE+ is usually 5 days.
3.What payment methods are accepted for MAX800LEPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX800LEPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX800LEPE+?
MAX800LEPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX800LEPE+ 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 MAX800LEPE+?
For technical support, including MAX800LEPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX800LEPE+ requirements.
6.How does Aetrix verify that MAX800LEPE+ is sourced from the original manufacturer or authorized distributors?
All MAX800LEPE+ 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 MAX800LEPE+ meets industry standards.
7.What is the process for return or replacement of MAX800LEPE+?
All MAX800LEPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX800LEPE+, 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 MAX800LEPE+ part is unused and in its original packaging.
Return procedure for MAX800LEPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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