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Analog Devices Inc./Maxim Integrated MAX808LCSA+T
- Part No.:
- MAX808LCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808LCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,289
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Product details
Overview
MAX808LCSA+T from Maxim Integrated is a precision +5V microprocessor supervisory IC providing reset generation, low-line warning, and battery-backed power switchover for CMOS RAM. It features ±1.5% reset threshold accuracy (4.675V), 200ms reset timeout, 1µA standby current, and integrated chip-enable gating with 3ns propagation delay. It is used in portable/battery-powered equipment to ensure orderly shutdown and memory retention during brownout.
For engineers reviewing the MAX808LCSA+T datasheet, MAX808LCSA+T pinout, MAX808LCSA+T application, or MAX808LCSA+T equivalent, key selection criteria include reset threshold tolerance, battery-switchover hysteresis, CE gating timing, VCC-to-RESET propagation delay, and compatibility with MaxCap™/SuperCap™ backup sources.
Technical Context
The MAX808LCSA+T implements a precision voltage comparator with 4.675V reset threshold and 52mV low-line offset, both referenced to VCC and guaranteed over temperature. Its internal timer enforces a fixed 200ms reset assertion period after VCC rises above threshold or falls below it.
It integrates dual PMOS power switches for seamless VCC-to-BATT switchover at OUT, supporting up to 250mA in VCC mode and 20mA in battery-backup mode. The CE IN/CE OUT transmission gate provides write-cycle completion logic with 18µs hold time and 3ns typical propagation delay under 50Ω/50pF test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.675V ±1.5% - ensures reliable µP reset before system voltage violates minimum operating spec. |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization and state recovery after power-up or brownout. |
| Low-Line Threshold | 4.727V (4.675V + 52mV) - triggers NMI for controlled software shutdown before reset occurs. |
| Standby Current | 1µA - enables ultra-low-power operation in battery-backed systems during extended idle periods. |
| VCC-to-OUT On-Resistance | 1.2Ω (typ) - limits voltage drop to ≤220mV at 250mA, preserving RAM supply integrity. |
| BATT-to-OUT On-Resistance | 12Ω (typ) - supports 20mA backup current while maintaining ≥2.5V output at VBATT = 2.8V. |
| CE Propagation Delay | 3ns (typ) - allows use with high-speed µPs without compromising memory access timing. |
Pinout & Package
MAX808LCSA+T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Primary +5V supply input | Bypassed with 0.1µF capacitor; powers all internal circuitry except BATT path. |
| 2 LOWLINE | CMOS active-low low-voltage warning output | Asserts when VCC drops to 52mV above reset threshold; used for NMI-triggered shutdown. |
| 3 RESET | Active-low reset output | Guaranteed valid down to VCC = 1V; strong pull-down/weak pull-up enables wire-OR configuration. |
| 4 GND | Signal and power ground reference | 0V reference for all comparators, outputs, and internal logic; must be low-impedance. |
| 5 CE OUT | Chip-enable output to CMOS RAM | Pulled to higher of VCC or VBATT when disabled; gated during reset to prevent write corruption. |
| 6 CE IN | Chip-enable input from µP/address decoder | High-impedance during reset; enables write-cycle completion logic with 18µs hold time. |
| 7 BATT | Backup battery input | Accepts 2.0V–4.5V; switchover occurs when VCC < VRST and VCC < VBATT; bypass with 0.1µF. |
| 8 OUT | Output supply to RAM and peripherals | Switches between VCC and BATT; delivers up to 250mA (VCC) or 20mA (BATT); bypass with 0.1µF. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables tighter system voltage margin control vs. ±2.5% alternatives, reducing risk of premature or late reset. |
| Integrated CE gating with write-cycle completion | Prevents partial writes to CMOS RAM during power failure by holding CE enabled for 18µs after reset assert. |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) via programmable switchover hysteresis and wide VBATT range. |
| RESET validity to VCC = 1V | Ensures deterministic reset behavior even during deep brownout, critical for fail-safe embedded systems. |
| 1µA battery-backup supply current | Extends shelf life of backup power source in portable instruments and controllers with infrequent operation. |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered handheld diagnostic instrument requiring nonvolatile RAM retention during battery swap or low-battery shutdown. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, low-line NMI, and seamless BATT switchover to OUT pin for RAM supply. Use Value: Prevents data loss during hot-swap by guaranteeing 200ms reset hold and enabling write-cycle completion before CE disable. |
Use Scenario: DIN-rail mounted controller operating in harsh environments where brownout immunity and deterministic reset are mandatory. IC Role / Device Role / Timing Role: System-level power supervisor generating RESET and LOWLINE signals to coordinate firmware shutdown and I/O isolation. Use Value: ±1.5% reset accuracy ensures reset occurs precisely at 4.675V, avoiding false resets from line ripple or aging supply drift. |
| Smart Energy Meters | Embedded Test Equipment |
Use Scenario: Utility meter with supercapacitor backup that must retain calibration data and time-of-use logs during AC mains interruption. IC Role / Device Role / Timing Role: Backup power manager using BATT switchover and CE gating to protect flash/RAM during transient outages. Use Value: MaxCap™ compatibility allows cost-effective 0.47F backup with no external charging circuitry or voltage clamping. |
Use Scenario: Benchtop functional tester with µP-based control logic and SRAM-based pattern storage requiring glitch-immune reset during probe contact bounce. IC Role / Device Role / Timing Role: Precision reset generator rejecting sub-3µs VCC transients while asserting clean 200ms RESET pulse on sustained brownout. Use Value: Immunity to short-duration noise eliminates spurious resets during relay switching or ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809LCSA+T | Single RESET output only; no LOWLINE, CE gating, or BATT switchover - lacks memory protection features. | Suitable for basic reset-only systems without RAM backup or NMI requirements. | Select MAX808LCSA+T when CE gating, low-line warning, or battery switchover are required. |
| TPS3808G18DBVR | Adjustable reset threshold (via external resistor); 3.6V max VCC; no BATT input or CE functionality. | Used in lower-voltage systems (1.8V–3.3V µPs); not compatible with +5V legacy designs or backup RAM schemes. | Choose MAX808LCSA+T for fixed 4.675V +5V supervision with integrated memory protection. |
Compared with MAX809LCSA+T and TPS3808G18DBVR, MAX808LCSA+T uniquely combines precision +5V reset, low-line warning, battery switchover, and CE gating in one SO-8 package - essential for robust RAM retention in portable and industrial µP systems.
Availability
MAX808LCSA+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, smart energy meters, embedded test equipment, and battery-backed instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX808LCSA+T 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 communications markets.
The MAX808LCSA+T belongs to Maxim's µP supervisory product line, engineered specifically for +5V systems requiring high-accuracy reset, battery-backed RAM protection, and fail-safe power-fail response in portable and mission-critical embedded applications.
FAQ
What is the exact reset threshold voltage of the MAX808LCSA+T?
The MAX808LCSA+T has a nominal reset threshold of 4.675V with ±1.5% accuracy over temperature. This value is confirmed in the Electrical Characteristics table under "VRST Reset Threshold" for the "L" suffix variant, and applies across the full operating temperature range of 0°C to +70°C.
Does the MAX808LCSA+T support battery switchover, and what are the current limits?
Yes, the MAX808LCSA+T supports automatic switchover from VCC to BATT when VCC falls below both the reset threshold (4.675V) and VBATT. In VCC mode, it delivers up to 250mA to OUT; in battery-backup mode, it supplies up to 20mA from BATT, with typical BATT-to-OUT on-resistance of 12Ω.
How does the CE gating function work in the MAX808LCSA+T during a power failure?
When RESET asserts, the MAX808LCSA+T disables the CE transmission gate. If a write cycle is in progress, it holds CE OUT enabled for 18µs to allow completion. After that, CE OUT goes high-impedance or is pulled to the higher of VCC/VBATT - preventing corrupted writes to CMOS RAM during brownout.
Is the MAX808LCSA+T compatible with SuperCap™ or MaxCap™ backup capacitors?
Yes, the MAX808LCSA+T is explicitly designed for SuperCap™/MaxCap™ compatibility. Its battery switchover hysteresis (typically 50mV) and wide VBATT input range (2.0V–4.5V) enable direct use with 0.47F supercapacitors, as validated in Figure 8 of the official datasheet.
What is the propagation delay from CE IN to CE OUT in the MAX808LCSA+T?
The MAX808LCSA+T specifies a typical CE IN-to-CE OUT propagation delay of 3ns under standard test conditions (50Ω driver, 50pF load). This value is measured from the 50% point on CE IN to the 50% point on CE OUT and is production-tested per the datasheet.
MAX808LCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.675V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX808LCSA+T FAQ
1.How can I place an order for MAX808LCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808LCSA+T 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 MAX808LCSA+T reliable?
The price and inventory of MAX808LCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808LCSA+T is usually 5 days.
3.What payment methods are accepted for MAX808LCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808LCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808LCSA+T?
MAX808LCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808LCSA+T 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 MAX808LCSA+T?
For technical support, including MAX808LCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808LCSA+T requirements.
6.How does Aetrix verify that MAX808LCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX808LCSA+T 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 MAX808LCSA+T meets industry standards.
7.What is the process for return or replacement of MAX808LCSA+T?
All MAX808LCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX808LCSA+T, 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 MAX808LCSA+T part is unused and in its original packaging.
Return procedure for MAX808LCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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