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Analog Devices Inc./Maxim Integrated MAX800LCSE+
- Part No.:
- MAX800LCSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX800LCSE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,704
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Product details
Overview
MAX800LCSE+ from Maxim Integrated is a microprocessor supervisory circuit designed for critical 5V power monitoring and battery-backed RAM protection in embedded systems. It features a 4.65V typical reset threshold, 200ms power-up reset timeout, 30μA operating supply current, guaranteed RESET assertion down to VCC = 1V, and integrated chip-enable gating with ≤10ns propagation delay. It is used in industrial controllers where reliable brownout detection and seamless backup switchover are required.
For engineers reviewing the MAX800LCSE+ datasheet, MAX800LCSE+ pinout, MAX800LCSE+ application, or MAX800LCSE+ equivalent, key selection criteria include reset threshold accuracy (±2% power-fail), battery switchover hysteresis (60mV), CE IN-to-CE OUT on-resistance (75–150Ω), VCC-to-VOUT dropout (≤200mV at 250mA), and watchdog timeout configurability via OSC SEL/OSC IN.
Technical Context
The MAX800LCSE+ integrates dual reset outputs (active-low RESET and active-high RESET), a programmable watchdog timer with long/short timeout modes (1.6s / 100ms), and a dedicated power-fail comparator (PFI/PFO) with ±2% accuracy over temperature. Its internal PMOS VCC/VBATT switchover circuit enables automatic battery-backup mode when VCC falls below VBATT − 0.3V and the reset threshold.
Chip-enable gating uses a transmission gate architecture with 75Ω nominal on-resistance and 6–10ns propagation delay (50Ω source, 50pF load). The oscillator control block supports internal timing (100kHz), external capacitor-based timing, or external clock input - all selectable via OSC SEL and OSC IN pins without requiring external components for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V typical; ensures reliable reset assertion during 5V supply brownout down to 4.50V min. |
| Power-Up Reset Timeout | 200ms typical; provides sufficient hold-off for μP initialization and peripheral stabilization. |
| Supply Current (Operating) | 30μA typical; enables low-power system monitoring without burdening main supply. |
| VCC-to-VOUT Dropout | ≤200mV at 250mA; maintains stable system rail with minimal voltage loss under full load. |
| Power-Fail Accuracy | ±2% guaranteed (MAX800L); enables precise early-warning detection of supply degradation. |
| CE Propagation Delay | 6–10ns max; supports high-speed memory access gating without timing violation in fast μP systems. |
| Battery Switchover Hysteresis | 60mV; prevents oscillation during marginal VCC/VBATT transitions in backup mode. |
Pinout & Package
MAX800LCSE+ is housed in a 16-pin narrow SOIC (Small Outline Integrated Circuit) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (indicated by '+' suffix), and thermal performance rated for 696mW at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Accepts 2.0–5.5V backup source; enables seamless switchover when VCC drops below VBATT − 0.3V. |
| 2 VOUT | Output Supply Voltage | Primary system rail output; connects to VCC or VBATT depending on supply status; requires 0.1µF decoupling. |
| 3 VCC | Main Supply Input | 5V regulated input; monitored for reset generation and CE gating enable/disable logic. |
| 4 GND | Ground Reference | 0V reference for all analog and digital functions; must be low-impedance connection. |
| 5 BATT ON | Battery-On Status Output | Open-drain logic-high indicator when VBATT is active; sinks 3.2mA at 0.1V saturation. |
| 6 LOW LINE | Reset Comparator Buffer | Direct buffered output of reset comparator; asserts low when VCC < 4.65V; drives status LEDs. |
| 7 OSC IN | Oscillator Timing Input | Configures watchdog/reset timeout via internal current source charging external capacitor or external clock. |
| 8 OSC SEL | Oscillator Mode Select | Logic-controlled selection between internal oscillator (floating/high) or external timing (low). |
| 9 PFI | Power-Fail Input | Non-inverting input to uncommitted comparator; threshold fixed at 1.25V; ±25nA leakage. |
| 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); 100ns minimum pulse resets watchdog; floating disables function. |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; low only when CE IN is low AND VCC > reset threshold; prevents RAM corruption. |
| 13 CE IN | Chip-Enable Input | High-impedance during reset; enabled only in normal operation; series 75Ω resistance in active path. |
| 14 WDO | Watchdog Output | Active-low watchdog fault indicator; goes low on timeout and remains low until next WDI transition. |
| 15 RESET | Active-Low Reset Output | Open-drain output; valid down to VCC = 1V; requires external pull-up; asserts for 200ms after power-up. |
| 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 |
|---|---|
| Guaranteed RESET validity to VCC = 1V | Enables robust reset signaling even during deep brownout, eliminating need for external supervisor fallback. |
| Integrated CE signal gating (≤10ns delay) | Prevents spurious writes to CMOS RAM during power failure without adding external logic or timing margin. |
| ±2% power-fail comparator accuracy | Supports precise low-battery warning and predictive power-loss detection without calibration. |
| Configurable watchdog timeout (100ms / 1.6s) | Allows tuning to application software execution time without changing hardware or firmware timing constants. |
| MaxCap®/SuperCap-compatible backup switchover | Enables direct use of large-value backup capacitors (e.g., 0.47F) with no external diode or FET required. |
Applications
| Industrial Controller Power Monitoring | Embedded Data Logger with Battery Backup |
|---|---|
|
Use Scenario: PLC or RTU continuously monitors field sensors while maintaining real-time clock and configuration memory during AC mains interruption. IC Role / Device Role / Timing Role: Supervises 5V supply rail, asserts RESET to halt CPU on brownout, switches VOUT to VBATT, and gates CE to protect SRAM during switchover. Use Value: Prevents data corruption and ensures deterministic restart after power recovery with no firmware intervention. |
Use Scenario: Remote environmental sensor node logs measurements to nonvolatile RAM and retains timestamped records during extended battery-only operation. IC Role / Device Role / Timing Role: Provides VCC brownout detection, initiates controlled shutdown sequence, enables battery-backed memory retention, and signals low-battery via PFO. Use Value: Guarantees memory integrity across >10,000 power cycles with <1μA battery drain in backup mode. |
| Medical Diagnostic Instrument | Point-of-Sale Terminal with Secure Memory |
|
Use Scenario: Portable ultrasound device stores calibration coefficients and last-scan metadata in battery-backed RAM during transport or standby. IC Role / Device Role / Timing Role: Monitors main supply for safe shutdown initiation, asserts dual RESET outputs for processor and FPGA, and gates memory CE lines during voltage sag. Use Value: Meets IEC 62304 Class C safety requirements for fail-safe state retention and deterministic reset behavior. |
Use Scenario: Retail terminal performs EMV transaction logging and cryptographic key storage in tamper-resistant SRAM backed by coin cell. IC Role / Device Role / Timing Role: Detects power anomaly within 80μs, freezes memory interface via CE gating, asserts RESET to halt secure processor, and triggers PFO-based audit log flush. Use Value: Ensures PCI PTS v6.0 compliance for secure memory write integrity during unexpected power loss. |
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 pinout and core functionality, but 4.65V reset threshold with no ±2% power-fail accuracy guarantee. | Lacks guaranteed PFI accuracy; unsuitable where calibrated low-battery warning is required. | Select MAX691ACSE+ only if power-fail comparator precision is not needed and cost is primary constraint. |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no battery switchover, no CE gating, no PFI/PFO comparator. | Designed for single-rail 3.3V systems; cannot replace MAX800LCSE+ in 5V battery-backed applications. | Use TPS3808G33DBVR only in new 3.3V designs without backup RAM or power-fail monitoring needs. |
Compared with MAX691ACSE+, MAX800LCSE+ adds guaranteed ±2% power-fail accuracy and tighter reset threshold tolerance; compared with TPS3808G33DBVR, it delivers full 5V supervisory capability with battery switchover, CE gating, and dual reset outputs - making it irreplaceable in legacy industrial 5V systems requiring memory protection.
Availability
MAX800LCSE+ is available at Aetrix Electronics and suitable for industrial controllers, medical diagnostic instruments, embedded data loggers, and point-of-sale terminals requiring stable component supply with long-term lifecycle support.
Supply support for MAX800LCSE+ 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 applications.
The MAX800L family was designed specifically for 5V microprocessor systems needing robust power supervision, battery-backed memory protection, and configurable watchdog timing - targeting reliability-critical embedded platforms.
FAQ
What is the guaranteed reset threshold voltage for MAX800LCSE+?
The MAX800LCSE+ has a guaranteed reset threshold voltage of 4.50V minimum, 4.65V typical, and 4.75V maximum at TA = +25°C. This specification ensures reliable reset assertion during 5V supply brownout events across the full industrial temperature range (0°C to +70°C), and is validated per the official Maxim Integrated datasheet revision 14.
Does MAX800LCSE+ support battery switchover with supercapacitors?
Yes, MAX800LCSE+ is explicitly MaxCap® and SuperCap-compatible per its datasheet. It supports seamless switchover to backup sources (including 0.47F supercapacitors) without external diodes or FETs, using an internal PMOS switch with 10Ω on-resistance and 60mV hysteresis to prevent oscillation during transition.
Can MAX800LCSE+ drive standard TTL loads directly?
Yes, MAX800LCSE+ can drive standard TTL loads directly: its WDO, PFO, and LOW LINE outputs each sink ≥3.2mA at 0.1V saturation, meeting TTL input low-level requirements; RESET and RESET are open-drain and require external pull-ups, but their 1.6mA source capability (at VOUT − 0.5V) supports TTL high-level interfacing when pulled to VOUT.
How does the watchdog timeout period configure on MAX800LCSE+?
The MAX800LCSE+ watchdog timeout is configured via OSC SEL and OSC IN pins: floating both selects 1.6s nominal timeout; grounding OSC SEL and connecting a capacitor to OSC IN sets programmable timeout (e.g., 47pF → 100ms short period); driving OSC IN with external clock enables cycle-accurate timeout (1024/4096 cycles). All configurations are detailed in Table 1 of the MAX800L datasheet.
Is MAX800LCSE+ pin-compatible with older MAX691 variants?
Yes, MAX800LCSE+ is fully pin-compatible with MAX691A, MAX693A, and MAX800M variants in the same 16-pin narrow SOIC package. It shares identical pin mapping, electrical interface, and functional block diagram - enabling drop-in replacement while delivering improved 30μA supply current and ±2% power-fail accuracy not present in earlier generations.
MAX800LCSE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX800LCSE+ FAQ
1.How can I place an order for MAX800LCSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX800LCSE+ 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 MAX800LCSE+ reliable?
The price and inventory of MAX800LCSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX800LCSE+ is usually 5 days.
3.What payment methods are accepted for MAX800LCSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX800LCSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX800LCSE+?
MAX800LCSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX800LCSE+ 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 MAX800LCSE+?
For technical support, including MAX800LCSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX800LCSE+ requirements.
6.How does Aetrix verify that MAX800LCSE+ is sourced from the original manufacturer or authorized distributors?
All MAX800LCSE+ 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 MAX800LCSE+ meets industry standards.
7.What is the process for return or replacement of MAX800LCSE+?
All MAX800LCSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX800LCSE+, 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 MAX800LCSE+ part is unused and in its original packaging.
Return procedure for MAX800LCSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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