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Analog Devices Inc./Maxim Integrated MAX808LCSA+
- Part No.:
- MAX808LCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808LCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,168
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Product details
Overview
MAX808LCSA+ from Maxim Integrated is an 8-pin CMOS microprocessor supervisory circuit designed for +5V systems, providing precision reset generation (±1.5% accuracy), battery switchover (250mA VCC / 20mA BATT mode), and low-line warning (52mV above reset threshold). It features a dedicated CE gating function with 3ns propagation delay and supports critical µP power monitoring in portable and embedded applications.
For engineers reviewing the MAX808LCSA+ datasheet, MAX808LCSA+ pinout, MAX808LCSA+ application, or MAX808LCSA+ equivalent, this device delivers deterministic reset timing (200ms timeout), guaranteed RESET validity down to VCC = 1V, battery-backed RAM protection, and integrated chip-enable write-cycle completion - all in an industry-standard 8-pin SO package.
Technical Context
The MAX808LCSA+ implements a dual-comparator architecture: one for precise reset detection at 4.675V ±1.5% (L-suffix), another for low-line warning at 4.727V (52mV above reset threshold), both with hysteresis. Its internal PMOS power switch enables seamless VCC-to-BATT switchover when VCC falls below both VRST and VBATT.
Unlike the MAX801, the MAX808LCSA+ omits watchdog functionality but adds active CE IN/CE OUT gating with 18µs write-cycle hold time and 75Ω series resistance. The CE path remains functional during normal operation and disables on RESET assertion to prevent RAM corruption during brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.675V ±1.5% - ensures reliable µP reset before system instability at nominal +5V supply |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization after power recovery |
| Low-Line Threshold | 4.727V (52mV above reset) - triggers NMI for orderly software shutdown before reset |
| VCC Supply Current | 48µA typical - enables ultra-low-power operation in battery-backed systems |
| Battery Switchover On-Resistance | 12Ω (VBATT = 2.0V) - limits voltage drop during backup mode, preserving RAM data integrity |
| CE Propagation Delay | 3ns typical - supports high-speed µP interfaces without timing violation |
| RESET Valid Down To | VCC = 1V - maintains reset assertion through deep brownout conditions |
Pinout & Package
MAX808LCSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (+ suffix). Pin 1 is marked with a dot or bevel; pin count and orientation follow JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Main supply input | Nominally +5V; bypassed with 0.1µF capacitor; powers internal circuitry and drives OUT during normal operation |
| 2: LOWLINE | CMOS logic output | Active-low NMI signal asserted when VCC drops to 4.727V; initiates controlled shutdown before reset |
| 3: RESET | Active-low reset output | Guaranteed valid down to VCC = 1V; strong pull-down/weak pull-up; wire-OR compatible |
| 4: GND | Ground reference | 0V reference for all analog comparators and digital outputs; requires low-impedance connection |
| 5: CE OUT | Chip-enable output | Driven to higher of VCC/VBATT when disabled; passes CE transitions during normal operation |
| 6: CE IN | Chip-enable input | High-impedance during reset; enables write-cycle completion hold (18µs) on falling VCC |
| 7: BATT | Battery backup input | Accepts 2.0V–4.5V backup source; switchover occurs only if VCC < VRST and VCC < VBATT |
| 8: OUT | Output supply rail | Delivers power to CMOS RAM; sourced from VCC or BATT via internal PMOS switches |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | ±1.5% threshold accuracy over temperature ensures consistent reset behavior across -40°C to +85°C |
| Integrated CE gating | 3ns propagation delay and 18µs write-cycle hold time prevent RAM corruption during power failure |
| Battery switchover control | Automatic VCC-to-BATT transition with 12Ω on-resistance preserves RAM data with minimal voltage droop |
| Low-line warning output | 52mV offset above reset threshold provides deterministic early-warning window for software shutdown |
| Ultra-low standby current | 48µA typical VCC supply current extends battery life in portable equipment |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered handheld diagnostic units requiring non-volatile RAM retention during main supply interruption. IC Role / Device Role / Timing Role: MAX808LCSA+ monitors VCC, asserts LOWLINE for firmware-initiated data save, then switches RAM to BATT and holds CE until write completes. Use Value: Prevents loss of patient measurement history during hot-swap battery replacement or transient brownout. |
Use Scenario: DIN-rail mounted programmable logic controllers operating in harsh industrial environments with unstable 5V rails. IC Role / Device Role / Timing Role: MAX808LCSA+ generates clean, glitch-immune RESET pulses and provides early LOWLINE warning to halt I/O scanning before voltage collapse. Use Value: Eliminates spurious relay actuation or sensor misreads caused by undervoltage-induced µP lockup. |
| Embedded Point-of-Sale Terminals | Smart Energy Meters |
Use Scenario: Credit card readers with flash memory and real-time clock, powered from USB or coin-cell backup. IC Role / Device Role / Timing Role: MAX808LCSA+ gates CE to RAM during power loss, ensuring transaction logs complete before power fails. Use Value: Guarantees ACID compliance for financial transactions even during sudden AC dropout. |
Use Scenario: Utility meters with supercapacitor backup, requiring long-term RAM retention during grid outages. IC Role / Device Role / Timing Role: MAX808LCSA+ interfaces with MaxCap™/SuperCap™ via BATT pin, enabling seamless switchover with no external FETs. Use Value: Reduces BOM count and PCB area while supporting >10-year backup runtime per charge cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809LCSA+ | Single-output (RESET only), no LOWLINE, no CE gating, same 4.675V threshold and 200ms timeout | Lacks NMI capability and RAM write protection; suitable only for basic reset-only designs | Select when cost sensitivity outweighs need for low-line warning or CE control |
| TPS3808G18DBVR | Adjustable reset threshold (via external resistor), 200ms timeout, no battery switchover or CE functions | Requires external components for threshold setting; no backup power management or memory gating | Choose for flexible threshold tuning where battery backup is handled externally |
Compared with MAX809LCSA+ and TPS3808G18DBVR, the MAX808LCSA+ uniquely integrates battery switchover, low-line warning, and CE gating in a single 8-pin SO package - making it the only option for applications requiring coordinated RAM protection during brownout without additional discrete logic.
Availability
MAX808LCSA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, embedded point-of-sale terminals, smart energy meters, and critical µP power monitoring systems requiring stable component supply across extended temperature ranges.
Supply support for MAX808LCSA+ 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, communications, and computing markets.
The MAX801/MAX808 family was designed specifically for robust, precision power supervision in battery-critical embedded systems - emphasizing reset accuracy, low quiescent current, and integrated memory protection features.
FAQ
What is the exact reset threshold voltage of the MAX808LCSA+?
The MAX808LCSA+ has a nominal reset threshold of 4.675V with ±1.5% accuracy over temperature (-40°C to +85°C). This value is fixed by the 'L' suffix and confirmed in the Electrical Characteristics table under VRST parameter. The MAX808LCSA+ guarantees reset assertion when VCC falls below this threshold and holds RESET active for 200ms after VCC rises above it.
Does the MAX808LCSA+ include a watchdog timer?
No, the MAX808LCSA+ does not include a watchdog timer. That feature is exclusive to the MAX801 series (e.g., MAX801LCSA+). The MAX808LCSA+ focuses on power supervision, battery switchover, and chip-enable gating - omitting watchdog circuitry to reduce complexity and current consumption (48µA typical vs. 68µA for MAX801).
How does the CE gating function work in the MAX808LCSA+ during a power failure?
During normal operation, the MAX808LCSA+ passes CE signals directly from CE IN to CE OUT. When VCC falls below the reset threshold, the device asserts RESET and disables the CE transmission gate. Crucially, if a RAM write is in progress, the MAX808LCSA+ holds CE enabled for 18µs to allow completion - a feature absent in basic supervisors like the MAX809LCSA+.
Can the MAX808LCSA+ operate with SuperCap™ or MaxCap™ backup sources?
Yes, the MAX808LCSA+ is explicitly MaxCap™/SuperCap™ compatible per its datasheet. Its battery switchover threshold hysteresis (VBATT + 0.05V on rising VCC) allows direct interface with large-value capacitors (e.g., 0.47F) without external charging circuitry - simplifying design and reducing BOM cost compared to alternatives requiring discrete FETs or charge pumps.
What is the minimum VCC voltage at which RESET remains valid on the MAX808LCSA+?
The MAX808LCSA+ guarantees RESET output validity down to VCC = 1V, as stated in the Features section and confirmed in the Electrical Characteristics table. This ensures reliable reset assertion even during deep brownout conditions where other supervisors may release RESET prematurely, preventing unintended µP execution.
MAX808LCSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-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:
- 4.675V
- 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+ FAQ
1.How can I place an order for MAX808LCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808LCSA+ 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+ reliable?
The price and inventory of MAX808LCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808LCSA+ is usually 5 days.
3.What payment methods are accepted for MAX808LCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808LCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808LCSA+?
MAX808LCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808LCSA+ 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+?
For technical support, including MAX808LCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808LCSA+ requirements.
6.How does Aetrix verify that MAX808LCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX808LCSA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX808LCSA+?
All MAX808LCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX808LCSA+, 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+ part is unused and in its original packaging.
Return procedure for MAX808LCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX808LCSA+ Tags
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MIC826SYMT-TR
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