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Analog Devices Inc./Maxim Integrated MAX808MCSA+T
- Part No.:
- MAX808MCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808MCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
MAX808MCSA+T from Maxim Integrated is a +5V microprocessor supervisory IC providing precision reset monitoring, battery switchover, low-line warning (NMI), and CMOS RAM write protection. It features ±1.5% reset threshold accuracy (4.425V), 200ms reset timeout, 1µA standby current, and operates over –40°C to +85°C in 8-pin SO package. It is used in portable/battery-powered equipment to ensure reliable power-up sequencing and orderly shutdown during brownout.
For engineers reviewing the MAX808MCSA+T datasheet, MAX808MCSA+T pinout, MAX808MCSA+T application, or MAX808MCSA+T equivalent, this page delivers verified functional role, exact reset/low-line thresholds, battery switchover behavior, CE gating timing, and real-world design implications for embedded µP systems with RAM backup requirements.
Technical Context
The MAX808MCSA+T implements three independent comparators: reset (4.425V ±1.5%), low-line (4.477V rising, 52mV above reset), and battery switchover (VBATT vs. VCC). Its internal 200ms reset timer ensures µP initialization stability, while its CE gating circuit enforces write-cycle completion via 18µs hold time after reset assertion.
Unlike the MAX801, it omits watchdog functionality but adds chip-enable input/output (CE IN/CE OUT) with 3ns typical propagation delay and 75Ω on-resistance. The OUT pin switches between VCC and VBATT using PMOS pass devices, supporting up to 250mA in VCC mode and 20mA in battery-backup mode with guaranteed RESET validity down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures deterministic µP reset before system voltage violates minimum operating spec. |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP to complete power-on self-test and initialize peripherals. |
| Low-Line Threshold | 4.477V (rising), 52mV above reset - triggers NMI for controlled software shutdown before reset occurs. |
| Battery Switchover | VBATT > VCC and VCC < 4.425V - enables automatic RAM power transfer without external logic or delay. |
| CE Propagation Delay | 3ns (typ), ≤8ns (max) - supports high-speed µP interfaces without timing violation in normal operation. |
| Standby Current | 1µA (battery-backup mode) - extends backup runtime for CMOS RAM during extended power loss. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial-grade embedded systems and portable instrumentation. |
Pinout & Package
MAX808MCSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (+T suffix). Pin 1 is marked with a dot or bevel; pin numbering follows standard SO convention (counterclockwise from marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | +5V main supply input | Bypassed with 0.1µF capacitor; powers all internal circuits except battery path; valid range 4.35V–5.5V. |
| 2 - LOWLINE | CMOS active-low NMI output | Asserts low when VCC falls to 4.477V; initiates software shutdown before reset; swings rail-to-rail (GND–VCC). |
| 3 - RESET | Active-low reset output | Guaranteed valid down to VCC = 1V; stays low ≥200ms after VCC rises above 4.425V; strong pull-down/weak pull-up. |
| 4 - GND | Signal and power ground reference | 0V reference for all comparators, outputs, and internal logic; must be low-impedance connection. |
| 5 - CE OUT | Chip-enable output to RAM | Pulled to higher of VCC/VBATT when disabled; passes CE IN transitions when enabled; 75Ω series resistance. |
| 6 - CE IN | Chip-enable input from µP | High-impedance during reset; enables CE gating; leakage ≤±1µA; drives CE OUT via transmission gate. |
| 7 - BATT | Backup battery input | Accepts 2.0V–4.5V; supplies RAM during VCC brownout; bypassed with 0.1µF; supports MaxCap™/SuperCap™. |
| 8 - OUT | RAM supply output | Switches between VCC and BATT; delivers up to 250mA (VCC mode) or 20mA (battery mode); bypassed with 0.1µF. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables tighter system voltage margin control and eliminates need for external trimming in industrial designs. |
| 18µs CE write-cycle completion hold | Prevents RAM corruption by extending CE enable window during falling VCC, ensuring write instruction finishes. |
| RESET valid to VCC = 1V | Allows robust reset assertion even under severe brownout, critical for fail-safe operation in battery-backed systems. |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) with no external charging circuitry or voltage clamping. |
| Low-line comparator with 52mV hysteresis | Provides clean, glitch-immune NMI signal for deterministic shutdown-no external comparator or RC delay needed. |
Applications
| Portable Medical Instrumentation | Industrial PLC Controller |
|---|---|
|
Use Scenario: Handheld blood glucose meter with nonvolatile RAM storing calibration data and usage logs. IC Role / Device Role / Timing Role: MAX808MCSA+T monitors main battery voltage, asserts LOWLINE at 4.477V to trigger firmware save routine, then asserts RESET at 4.425V if voltage continues to fall. Use Value: Ensures RAM integrity across 1000+ power cycles; 1µA battery-backup current extends shelf life beyond 5 years with CR2032. |
Use Scenario: DIN-rail mounted PLC with SRAM-based configuration memory and real-time clock. IC Role / Device Role / Timing Role: MAX808MCSA+T gates CE to SRAM during power interruption; holds CE OUT active for 18µs after RESET assertion to complete pending write. Use Value: Eliminates external CE latch and timing logic; prevents configuration corruption during AC line sag or fuse blow events. |
| Automotive Infotainment Head Unit | Smart Energy Meter |
|
Use Scenario: In-vehicle navigation system with backup supercapacitor powering RTC and SRAM during engine cranking. IC Role / Device Role / Timing Role: MAX808MCSA+T switches OUT from 5V rail to 2.7V supercap when VCC drops below 4.425V; uses built-in hysteresis to prevent chatter. Use Value: Enables seamless RTC continuity and state retention during 12V battery dip to 6V; no external MOSFET or diode OR-ing required. |
Use Scenario: ANSI C12.20-certified electricity meter with tamper-resistant SRAM storing billing data and time-of-use registers. IC Role / Device Role / Timing Role: MAX808MCSA+T provides dual-voltage supervision: RESET at 4.425V for MCU reset, LOWLINE at 4.477V for secure data commit before power loss. Use Value: Meets IEC 62053-21 data retention requirements; 200ms reset timeout satisfies metering firmware boot validation windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809MCSA+T | Single RESET output only; no LOWLINE or CE gating; identical 4.425V reset threshold and 200ms timeout. | Lacks NMI capability and RAM write protection-suitable only for basic reset-only systems. | Select when cost sensitivity outweighs need for orderly shutdown or RAM safety features. |
| TPS3808G33DBVR | 3.3V reset threshold; no battery switchover or CE gating; 200ms timeout; 1.6µA quiescent current. | Designed for 3.3V µP systems; incompatible with +5V VCC architecture or backup-battery use cases. | Choose only for new 3.3V designs requiring TI-qualified automotive AEC-Q100 support-not a drop-in replacement. |
Compared with MAX808MCSA+T, MAX809MCSA+T reduces feature set to cut cost but sacrifices NMI and RAM protection, while TPS3808G33DBVR targets different voltage domains and lacks battery management-neither offers full functional equivalence.
Availability
MAX808MCSA+T is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC controllers, automotive infotainment head units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX808MCSA+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) is a fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX801/MAX808 family was designed specifically for +5V microprocessor systems needing precision voltage supervision, battery-backed RAM protection, and deterministic power-fail response-targeting portable, industrial, and instrumentation markets.
FAQ
What is the exact reset threshold voltage of the MAX808MCSA+T?
The MAX808MCSA+T has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature and supply variation. This value is fixed by the 'M' suffix and confirmed in the Electrical Characteristics table (VRST MIN = 4.350V, TYP = 4.425V, MAX = 4.500V). It is not adjustable and applies across the full –40°C to +85°C operating range.
Does the MAX808MCSA+T include a watchdog timer function?
No, the MAX808MCSA+T does not include a watchdog timer. That feature is exclusive to the MAX801 variant. The MAX808MCSA+T instead provides chip-enable (CE) gating with 18µs write-cycle completion hold and low-line warning output-making it optimized for RAM integrity rather than program execution monitoring.
How does the MAX808MCSA+T handle battery switchover during power failure?
The MAX808MCSA+T switches OUT from VCC to BATT automatically when two conditions are met: VCC falls below 4.425V *and* VCC is lower than VBATT. The switchover uses internal PMOS switches with ~12Ω on-resistance in battery mode, supporting up to 20mA to preserve CMOS RAM contents. VBATT may exceed VCC safely during normal operation.
What is the purpose of the CE IN and CE OUT pins on the MAX808MCSA+T?
The CE IN and CE OUT pins implement hardware-enforced RAM write protection. During normal operation, CE IN passes directly to CE OUT. When RESET asserts, the CE gate disables-but holds CE OUT active for 18µs to let the µP complete any ongoing RAM write cycle before disconnecting, preventing data corruption during brownout.
Can the MAX808MCSA+T operate with a supercapacitor instead of a battery?
Yes, the MAX808MCSA+T is explicitly MaxCap™/SuperCap™ compatible. Its battery switchover comparator includes hysteresis (typically +50mV on rising VCC), enabling direct use of large-value supercaps (e.g., 0.47F) charged from the main rail-no external charging circuit or voltage regulation is required for RAM backup operation.
MAX808MCSA+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:
- 4.425V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX808MCSA+T FAQ
1.How can I place an order for MAX808MCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808MCSA+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 MAX808MCSA+T reliable?
The price and inventory of MAX808MCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808MCSA+T is usually 5 days.
3.What payment methods are accepted for MAX808MCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808MCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808MCSA+T?
MAX808MCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808MCSA+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 MAX808MCSA+T?
For technical support, including MAX808MCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808MCSA+T requirements.
6.How does Aetrix verify that MAX808MCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX808MCSA+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 MAX808MCSA+T meets industry standards.
7.What is the process for return or replacement of MAX808MCSA+T?
All MAX808MCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX808MCSA+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 MAX808MCSA+T part is unused and in its original packaging.
Return procedure for MAX808MCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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