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Analog Devices Inc./Maxim Integrated MAX800LESE
- Part No.:
- MAX800LESE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX800LESE.pdf
- Description:
- IC SUPERVISOR MAX800 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:790
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Product details
Overview
MAX800LESE from Maxim Integrated is a microprocessor supervisory circuit with 4.65V reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and integrated chip-enable gating for CMOS RAM protection. It monitors VCC in critical embedded systems and asserts RESET down to VCC = 1V, enabling reliable brownout recovery in industrial controllers and intelligent instruments.
For engineers reviewing the MAX800LESE datasheet, MAX800LESE pinout, MAX800LESE application, or MAX800LESE equivalent, this page delivers verified electrical parameters, battery-switchover behavior, watchdog timing options, and precise package-level interface details required for power-fail detection, backup-battery management, and CE signal integrity assurance.
Technical Context
The MAX800LESE implements dual-reset outputs (active-low RESET and active-high RESET), a dedicated watchdog timer with selectable 100ms/1.6s timeout periods via OSC SEL/OSC IN, and a voltage-controlled switchover between VCC and VBATT with ±2% power-fail accuracy. Its internal PMOS switch enables VOUT sourcing up to 250mA from VCC or 25mA from VBATT.
It features a 75Ω CE transmission gate with ≤10ns propagation delay (50Ω source, 50pF load), open-drain RESET output valid to 1V, and an uncommitted PFI/PFO comparator for low-battery warning independent of reset logic. Battery-backup mode activates only when VCC falls below both the 4.65V reset threshold and VBATT – 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.65V typical; ensures deterministic μP reset at nominal +5V rail collapse, with 15mV hysteresis. |
| Power-Up Reset Timeout | 200ms typical; guarantees stable VCC before releasing μP from reset, preventing boot corruption. |
| Supply Current (Operating) | 30μA typical; enables long-term operation in battery-backed systems without significant drain. |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω (MAX800_C/E); supports 250mA continuous VOUT sourcing with ≤200mV drop at full load. |
| Power-Fail Accuracy | ±2% guaranteed (MAX800L); enables precise early-warning detection for system shutdown or data save. |
| Chip-Enable Propagation Delay | 6–10ns (50Ω/50pF); preserves timing margins in high-speed μP bus environments during power faults. |
| RESET Validity Range | Down to VCC = 1V; maintains functional reset assertion through deep brownout, unlike standard 3.0V-reset ICs. |
Pinout & Package
MAX800LESE is housed in a 16-pin narrow SO (Small Outline) package with 1.27mm pitch, RoHS-compliant lead-free finish. Pin 1 is marked by a beveled corner or dot; thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Connects to backup capacitor or Li-ion cell; enables VOUT sourcing when VCC fails; max 25mA continuous. |
| 2 VOUT | Output Supply Voltage | Main system supply rail; switches between VCC and VBATT; decouple with 0.1µF to GND. |
| 3 VCC | Main Supply Input | +4.75V to +5.5V regulated input; powers internal circuitry and sources VOUT up to 250mA. |
| 4 GND | Ground Reference | 0V reference for all analog and digital functions; connect to system ground plane with low impedance. |
| 5 BATT ON | Battery-On Indicator | Open-drain output high when VBATT supplies VOUT; sinks 3.2mA @ 0.1V for LED or transistor drive. |
| 6 LOW LINE | Reset Comparator Output | Buffered inverted reset signal; active low at VCC < 4.65V; used for status LEDs or interrupt generation. |
| 7 OSC IN | Oscillator Timing Input | Accepts external clock or timing capacitor (e.g., 47pF) to set watchdog/reset timeout periods. |
| 8 OSC SEL | Oscillator Mode Select | Logic high = internal oscillator (1.6s/200ms); logic low = external timing control; internal 10µA pull-up. |
| 9 PFI | Power-Fail Input | Non-inverting comparator input; triggers PFO low when voltage drops below 1.25V ±25mV. |
| 10 PFO | Power-Fail Output | Open-drain alert output; sinks 3.2mA @ 0.1V; used for low-battery or early power-loss notification. |
| 11 WDI | Watchdog Input | Three-level input (high/mid/low); reset triggered if no transition occurs within watchdog timeout period. |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; disabled during reset to prevent spurious writes to CMOS RAM or EEPROM. |
| 13 CE IN | Chip-Enable Input | High-impedance when reset asserted; series 75Ω resistance in enabled mode for clean signal pass-through. |
| 14 WDO | Watchdog Output | Active-low watchdog fault indicator; goes low on WDI timeout and remains low until next WDI edge. |
| 15 RESET | Active-Low Reset Output | Open-drain output; asserts low on VCC drop below 4.65V; guaranteed functional down to VCC = 1V. |
| 16 RESET | Active-High Reset Output | Open-drain complement of RESET; high when RESET is low; used for μPs requiring active-high reset. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Enables robust brownout recovery in systems where supply rails decay slowly below 2V. |
| ±2% power-fail comparator accuracy (MAX800L) | Supports deterministic low-voltage warning for controlled data save before complete power loss. |
| On-board CE signal gating with ≤10ns delay | Prevents memory corruption during power transients without adding external logic or layout complexity. |
| MaxCap®/SuperCap-compatible battery switchover | Allows use of large-value backup capacitors (e.g., 0.47F) with minimal leakage impact on hold-up time. |
| Selectable watchdog timeout (100ms or 1.6s) | Permits tuning to application software execution time-short for fast-boot systems, long for complex firmware. |
Applications
| Industrial Controller Monitoring | Intelligent Instrument Power Management |
|---|---|
|
Use Scenario: PLC or motion controller maintaining real-time operation during AC line sags or DC supply ripple. IC Role / Device Role / Timing Role: Supervises +5V rail, asserts RESET before μP executes invalid instructions, gates CE to protect configuration EEPROM during brownout. Use Value: Prevents corrupted I/O state or lost position data by ensuring deterministic reset and memory write blocking below 4.65V. |
Use Scenario: Portable multimeter or handheld analyzer preserving calibration data and display state during battery swap. IC Role / Device Role / Timing Role: Switches VOUT from main supply to backup capacitor, monitors PFI for low-battery alert, holds μP in reset until stable VCC returns. Use Value: Enables zero-interruption operation across battery changes and extends usable runtime via 30μA standby current. |
| Critical μP Power Monitoring | Computing System Health Management |
|
Use Scenario: Medical diagnostic device requiring fail-safe boot sequence and nonvolatile memory integrity under variable input conditions. IC Role / Device Role / Timing Role: Generates 200ms reset pulse on power-up, validates VCC > 4.65V before release, disables CE during voltage instability. Use Value: Meets IEC 62304 safety requirements by eliminating race conditions during power sequencing and memory access. |
Use Scenario: Embedded network appliance performing graceful shutdown upon AC power loss detection. IC Role / Device Role / Timing Role: Uses PFI/PFO comparator to trigger early warning at 1.25V, initiates firmware save routine, then asserts RESET after safe state is reached. Use Value: Achieves <100ms data preservation window using ±2% accurate PFI threshold-no external precision resistor needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACSE | Same 4.65V reset threshold and 200ms timeout, but lacks ±2% power-fail accuracy spec and has higher 100μA operating current. | Not suitable for precision low-battery warning; acceptable for basic reset-only monitoring where PFI/PFO use is omitted. | Select MAX691ACSE only if power-fail comparator accuracy is unnecessary and cost is prioritized over battery-life optimization. |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no battery switchover, no CE gating, 1.5μA quiescent current, but includes manual reset input. | Designed for single-rail 3.3V systems; cannot replace MAX800LESE in 5V battery-backup or CE-protection roles. | Choose TPS3808G33DBVR only for new 3.3V designs without backup power or memory write protection requirements. |
Compared with MAX691ACSE and TPS3808G33DBVR, the MAX800LESE uniquely combines 4.65V precision reset, ±2% PFI accuracy, integrated CE gating, and true 1V-reset validity-making it irreplaceable in 5V industrial systems requiring coordinated power-fail response and memory safety.
Availability
MAX800LESE is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, medical diagnostics equipment, and computing appliances requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX800LESE 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 series was designed specifically for robust microprocessor supervision in harsh environments-delivering guaranteed reset behavior down to 1V, precision power-fail detection, and hardware-enforced memory protection without software overhead.
FAQ
What is the reset threshold voltage of the MAX800LESE?
The MAX800LESE has a typical reset threshold voltage of 4.65V, with a guaranteed range of 4.50V to 4.75V across temperature and supply variations. This value is factory-trimmed and applies to both power-up and power-down conditions. The MAX800LESE maintains RESET assertion validity even as VCC declines to 1V, ensuring reliable operation during deep brownouts. This specification is confirmed in the Electrical Characteristics table of the official Maxim datasheet.
Does the MAX800LESE support battery backup switching?
Yes, the MAX800LESE supports automatic battery backup switching via its VBATT and VOUT pins. When VCC falls below both the 4.65V reset threshold and VBATT – 0.3V, the internal PMOS switch connects VOUT to VBATT, sustaining system power. In this mode, VOUT can deliver up to 25mA continuously from VBATT, and the BATT ON output goes high to indicate switchover. The MAX800LESE guarantees ±2% accuracy on the power-fail comparator (PFI/PFO), making it suitable for precise low-battery detection.
How does the watchdog function operate on the MAX800LESE?
The MAX800LESE watchdog monitors the WDI pin for transitions; if no edge occurs within the selected timeout period (100ms or 1.6s), it asserts both RESET and WDO low for 200ms. WDI is internally biased to ~1.6V when floating, disabling the watchdog. The timeout is configured via OSC SEL and OSC IN: floating both selects 1.6s, grounding OSC SEL with a capacitor on OSC IN allows programmable timing. The MAX800LESE's watchdog operates independently of reset state and remains functional only when VCC is above the reset threshold.
What package type is used for the MAX800LESE?
The MAX800LESE is supplied in a 16-pin narrow SO (Small Outline) package with 1.27mm lead pitch and RoHS-compliant lead-free finish. This package is explicitly listed in the Ordering Information section of the Maxim datasheet under "MAX800LESE" (not MAX800LESE+). It measures 9.9mm × 3.9mm × 1.75mm and is compatible with standard SOIC-16 reflow profiles. Thermal performance is rated at 696mW at +70°C with 8.70mW/°C derating above that temperature.
Can the MAX800LESE be used with a 3.3V microprocessor?
No, the MAX800LESE is not designed for direct use with 3.3V microprocessors. Its reset threshold is fixed at 4.65V, and its VCC operating range is +4.75V to +5.5V. While the RESET and RESET outputs are open-drain and can be pulled to 3.3V with an external resistor, the internal comparators, CE gating, and VOUT regulation all assume a 5V system context. For 3.3V applications, a dedicated 3.3V supervisor such as the TPS3808G33DBVR should be selected instead of the MAX800LESE.
MAX800LESE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX800LESE FAQ
1.How can I place an order for MAX800LESE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX800LESE 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 MAX800LESE reliable?
The price and inventory of MAX800LESE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX800LESE is usually 5 days.
3.What payment methods are accepted for MAX800LESE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX800LESE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX800LESE?
MAX800LESE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX800LESE 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 MAX800LESE?
For technical support, including MAX800LESE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX800LESE requirements.
6.How does Aetrix verify that MAX800LESE is sourced from the original manufacturer or authorized distributors?
All MAX800LESE 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 MAX800LESE meets industry standards.
7.What is the process for return or replacement of MAX800LESE?
All MAX800LESE units undergo pre-shipment inspection (PSI). If there is an issue with MAX800LESE, 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 MAX800LESE part is unused and in its original packaging.
Return procedure for MAX800LESE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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