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Analog Devices Inc./Maxim Integrated MAX800LEUE+
- Part No.:
- MAX800LEUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX800LEUE+.pdf
- Description:
- IC SUPERVISOR MPU 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,476
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Product details
Overview
MAX800LEUE+ from Maxim Integrated is a microprocessor supervisory circuit with dual reset outputs (active-low RESET and active-high RESET), 4.65V typical reset threshold, ±2% power-fail accuracy, 200ms power-up reset timeout, and integrated chip-enable gating. It monitors VCC for brownout detection, provides battery switchover down to 1V VCC, and supports CMOS RAM write protection in industrial controllers and intelligent instruments.
For engineers reviewing the MAX800LEUE+ datasheet, MAX800LEUE+ pinout, MAX800LEUE+ application, or MAX800LEUE+ equivalent, this page delivers verified technical context, real-world timing behavior, battery-backup mode operation, CE signal gating performance, and validated alternative options for critical μP power monitoring designs.
Technical Context
The MAX800LEUE+ integrates a precision voltage monitor with hysteresis (15mV), internal oscillator (100kHz nominal), and dual-mode watchdog timer (100ms short/1.6s long period). Its reset generator asserts both RESET and RESET outputs when VCC falls below 4.65V, maintaining validity down to VCC = 1V - guaranteed by open-drain architecture and external pulldown support.
Chip-enable gating uses a 75Ω series transmission gate between CE IN and CE OUT, delivering ≤10ns propagation delay (50Ω source, 50pF load) and automatic disable during reset assertion. Battery switchover activates when VCC < VBATT − 0.3V and VCC < reset threshold, routing VOUT to VBATT with ≤30Ω on-resistance at 2.0V VBATT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.65V typical; ensures reliable μP reset initiation at standard +5V supply brownout levels |
| Power-Up Reset Timeout | 200ms typical; provides sufficient hold time for stable clock and memory initialization |
| Supply Current (Operating) | 30μA typical; enables low-power operation in always-on monitoring circuits |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω (MAX800L); maintains ≤200mV drop at 250mA load for clean system rail delivery |
| Power-Fail Accuracy | ±2% (guaranteed); supports precise low-battery warning and early power-fail detection |
| CE IN-to-CE OUT Propagation Delay | 6–10ns; compatible with high-speed μP bus timing without added latency |
| RESET Output Validity Range | Down to VCC = 1V; guarantees reset assertion integrity during deep brownout conditions |
Pinout & Package
MAX800LEUE+ is housed in a 16-pin TSSOP package (4.4mm × 5.0mm, 0.65mm pitch), RoHS-compliant and lead-free (denoted by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Accepts 2.0–5.5V backup source; enables seamless switchover when VCC fails |
| 2 VOUT | Output Supply Voltage | Switched output tied to VCC or VBATT; powers downstream logic and serves as reference for all open-drain outputs |
| 3 VCC | Main Supply Input | +4.75V to +5.5V regulated input; monitored for reset generation and CE gating control |
| 4 GND | Ground Reference | 0V return path for all analog and digital functions; decoupling capacitor required at VOUT |
| 5 BATT ON | Battery-On Status Indicator | Active-high open-drain output signaling VBATT engagement; drives PNP base or status LED |
| 6 LOW LINE | Reset Comparator Buffer | Direct buffered output of reset comparator; sinks 3.2mA at 0.1V for direct interface to logic inputs |
| 7 OSC IN | External Oscillator Timing Input | Accepts capacitor or clock signal to configure watchdog/reset timeouts; biased internally when floating |
| 8 OSC SEL | Oscillator Mode Select | High = internal oscillator; low = external timing; 10μA pull-up enables default 1.6s/200ms timing |
| 9 PFI | Power-Fail Input | Non-inverting comparator input (1.25V threshold); detects supply sag or battery depletion with ±25nA leakage |
| 10 PFO | Power-Fail Output | Open-drain comparator output; asserts low on PFI < 1.25V; independent of reset logic |
| 11 WDI | Watchdog Input | Three-level input (high/mid/low); resets watchdog timer on any >100ns transition; disabled when floating (~1.6V) |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; disabled during reset to prevent spurious writes to CMOS RAM/EEPROM |
| 13 CE IN | Chip-Enable Input | High-impedance when reset asserted; 75Ω series resistance in enabled mode for minimal loading |
| 14 WDO | Watchdog Output | Open-drain fault indicator; goes low on watchdog timeout and remains low until next WDI transition |
| 15 RESET | Active-Low Reset Output | Open-drain output; sinks 3.2mA at 0.1V; valid down to VCC = 1V; requires external pullup |
| 16 RESET | Active-High Reset Output | Open-drain inverse of RESET; high-impedance when inactive; used for μPs requiring active-high reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs (RESET/RESET) | Supports both active-low and active-high μP reset inputs without external inverters or level shifters |
| Guaranteed reset assertion to VCC = 1V | Ensures deterministic reset behavior during severe brownout, even with weak or failing supplies |
| ±2% power-fail comparator accuracy | Enables reliable low-battery detection and predictive power-loss warning in battery-backed systems |
| On-board CE signal gating | Prevents erroneous writes to volatile memory during power transitions - no external logic required |
| MaxCap®/SuperCap-compatible switchover | Supports high-capacitance backup sources (e.g., 0.47F) with controlled charge/discharge paths |
| Configurable watchdog timeout (100ms / 1.6s) | Allows tuning for fast-recovery systems or long-latency firmware execution without redesign |
Applications
| Industrial Controller Power Monitoring | Intelligent Instrument Backup Management |
|---|---|
|
Use Scenario: PLC or RTU mainboard with 5V supply, CMOS SRAM, and lithium battery backup. IC Role / Device Role / Timing Role: Supervises VCC, asserts dual reset signals, gates CE to SRAM, switches VOUT to VBATT on failure, and triggers low-battery alert via PFO. Use Value: Prevents memory corruption during brownout, extends runtime using backup cap, and provides accurate end-of-life warning before data loss. |
Use Scenario: Portable multimeter or data logger with EEPROM storage and coin-cell backup. IC Role / Device Role / Timing Role: Monitors main supply, generates 200ms reset pulse on power-up, disables CE during reset, and asserts BATT ON to enable backup regulator. Use Value: Guarantees clean boot sequence, protects calibration data in EEPROM, and enables seamless transition to battery power without software intervention. |
| Critical μP System Watchdog | Computer Board Power Sequencing |
|
Use Scenario: Embedded x86 or ARM-based controller running safety-critical firmware. IC Role / Device Role / Timing Role: Watches WDI line for firmware liveliness; asserts RESET/RESET and WDO on timeout; configurable 100ms/1.6s window adapts to task scheduling. Use Value: Detects lockups or infinite loops in real-time tasks and forces hardware reset - independent of software state. |
Use Scenario: Industrial PC motherboard requiring coordinated reset timing across CPU, chipset, and peripherals. IC Role / Device Role / Timing Role: Provides synchronized 200ms reset pulse, buffers LOW LINE for BIOS power-good signaling, and gates CE to legacy I/O chips. Use Value: Eliminates race conditions in multi-rail power sequencing and ensures all subsystems initialize in defined order. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691AESE+ | Same 4.65V reset threshold and 200ms timeout, but in 16-pin narrow SO package; higher temp range (−40°C to +85°C) | Preferred where board space allows SO package and extended temperature operation is required | Select MAX691AESE+ when TSSOP footprint is unavailable or industrial ambient exceeds +70°C |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no CE gating, no dual reset outputs, lower quiescent current (1.8μA), no battery switchover | Suitable only for simple 3.3V systems without memory write protection or backup power management | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only applications lacking battery backup or CE control needs |
Compared with MAX691AESE+, MAX800LEUE+ offers identical supervision functionality in a smaller TSSOP package but with commercial temperature grade; versus TPS3808G33DBVR, it delivers full feature parity for 5V systems including CE gating, dual reset, and battery switchover - making it irreplaceable in legacy industrial designs.
Availability
MAX800LEUE+ is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, critical μP power monitoring, and embedded computer boards requiring stable component supply across production lifecycles.
Supply support for MAX800LEUE+ 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 management, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX800L family targets robust μP supervision in harsh environments, emphasizing guaranteed reset validity down to 1V, ±2% power-fail accuracy, and integrated memory protection features.
FAQ
What is the guaranteed reset threshold voltage for MAX800LEUE+?
The MAX800LEUE+ has a guaranteed reset threshold voltage of 4.50V minimum, 4.65V typical, and 4.75V maximum at TA = +25°C, with hysteresis of 15mV. This specification applies across the full operating temperature range (0°C to +70°C) and ensures consistent brownout detection for +5V systems. The MAX800LEUE+ reset threshold is distinct from the MAX800M's 4.4V rating and is explicitly validated in the device's Electrical Characteristics table.
Does MAX800LEUE+ support battery switchover, and what are the voltage conditions?
Yes, MAX800LEUE+ supports automatic battery switchover when two conditions are met: VCC must fall below the reset threshold (4.65V) and also drop below VBATT minus 0.3V (power-down hysteresis). In battery-backup mode, VOUT connects to VBATT through an internal PMOS switch with ≤30Ω on-resistance at 2.0V, and BATT ON asserts high to indicate switchover. The MAX800LEUE+ guarantees operation with VBATT as low as 2.0V.
Can MAX800LEUE+ drive CMOS RAM write protection without external components?
Yes, MAX800LEUE+ provides on-board chip-enable (CE) gating via its CE IN and CE OUT pins. When reset is asserted, the internal 75Ω transmission gate disables, preventing spurious writes to CMOS RAM or EEPROM. No external logic or transistors are needed - the MAX800LEUE+ handles CE signal blocking autonomously during power-up, brownout, or watchdog fault events.
What is the power-fail accuracy specification for MAX800LEUE+?
The MAX800LEUE+ guarantees power-fail comparator accuracy of ±2% over temperature and supply voltage, specifically for the MAX800L variant. This applies to the PFI input threshold of 1.25V (min 1.225V, max 1.275V at VCC = 5V), enabling precise low-battery detection and early power-loss warning in backup systems - a key differentiator from generic supervisors lacking tight tolerance specs.
How does the watchdog function behave when WDI is left unconnected on MAX800LEUE+?
When WDI is left unconnected on MAX800LEUE+, an internal voltage divider biases it to ~1.6V, placing it in the "mid-level" state that disables the watchdog timer. WDO remains high, and no reset pulses are generated. This behavior is documented in the datasheet's "Watchdog Input" section and confirmed across temperature; the MAX800LEUE+ requires no pullup/pulldown on WDI for safe watchdog disable.
MAX800LEUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
MAX800LEUE+ FAQ
1.How can I place an order for MAX800LEUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX800LEUE+ 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 MAX800LEUE+ reliable?
The price and inventory of MAX800LEUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX800LEUE+ is usually 5 days.
3.What payment methods are accepted for MAX800LEUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX800LEUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX800LEUE+?
MAX800LEUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX800LEUE+ 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 MAX800LEUE+?
For technical support, including MAX800LEUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX800LEUE+ requirements.
6.How does Aetrix verify that MAX800LEUE+ is sourced from the original manufacturer or authorized distributors?
All MAX800LEUE+ 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 MAX800LEUE+ meets industry standards.
7.What is the process for return or replacement of MAX800LEUE+?
All MAX800LEUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX800LEUE+, 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 MAX800LEUE+ part is unused and in its original packaging.
Return procedure for MAX800LEUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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