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Analog Devices Inc./Maxim Integrated MAX808MESA+
- Part No.:
- MAX808MESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX808MESA+.pdf
- Description:
- IC SUPERVISOR MPU 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:313
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Product details
Overview
MAX808MESA+ from Maxim Integrated is an 8-pin microprocessor supervisory circuit designed for +5V systems, providing precision reset generation (±1.5% accuracy), battery switchover (250mA VCC / 20mA BATT mode), low-line warning (52mV above reset threshold), and CMOS RAM write protection via chip-enable gating. It operates across –40°C to +85°C and guarantees valid RESET output down to VCC = 1V.
For engineers reviewing the MAX808MESA+ datasheet, MAX808MESA+ pinout, MAX808MESA+ application, or MAX808MESA+ equivalent, this page delivers verified functional identity, exact reset threshold (4.425V), battery-switchover behavior, CE gating timing (3ns propagation delay), and real-world use in portable/battery-powered equipment requiring deterministic power-fail response.
Technical Context
The MAX808MESA+ integrates three independent comparators-reset (4.425V ±1.5%), low-line (4.477V rising), and battery switchover-with internal 200ms reset timeout timer and CMOS RAM write-cycle completion logic. Its BiCMOS process enables 48µA typical supply current in normal operation while maintaining ±1.5% voltage threshold stability over temperature.
Unlike the MAX801, the MAX808MESA+ omits watchdog functionality but adds active chip-enable gating: CE IN passes through to CE OUT during normal operation, then disables on RESET assertion, with 18µs write-completion hold time if VCC falls mid-write. Output switching uses dual PMOS pass devices for BATT-to-OUT path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures reliable µP reset before brownout-induced code corruption |
| RESET Timeout Delay | 200ms - provides sufficient deassertion hold time for full µP initialization |
| Low-Line Threshold | 4.477V (52mV above reset) - triggers NMI for orderly software shutdown before reset |
| VCC-to-OUT On-Resistance | 1.2Ω typ. - limits voltage drop to ≤220mV at 250mA load for stable RAM supply |
| BATT-to-OUT On-Resistance | 12Ω typ. - supports up to 20mA backup current with ≤240mV drop at 20mA |
| CE Propagation Delay | 3ns max - enables compatibility with high-speed µPs without timing violation |
| Supply Current (Normal) | 48µA typ. - minimizes quiescent drain in always-on +5V systems |
| RESET Valid Down To | VCC = 1V - maintains reset integrity during deep brownout or slow power ramp-down |
Pinout & Package
MAX808MESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (+ suffix). Pin functions are electrically validated per Maxim's official datasheet revision 1 (11/05).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | +5V main supply input | Bypassed with 0.1µF capacitor; powers all internal circuitry except BATT path |
| 2: LOWLINE | Active-low CMOS low-voltage warning output | Asserts ~52mV above reset threshold to trigger NMI for controlled shutdown |
| 3: RESET | Active-low reset output | Guaranteed logic low for VCC ≥1V; strong pull-down/weak pull-up; wire-OR capable |
| 4: GND | Signal and power ground reference | 0V reference for all comparators, outputs, and internal biasing |
| 5: CE OUT | Chip-enable output to RAM | Pulled to higher of VCC/VBATT when disabled; passes CE IN during normal operation |
| 6: CE IN | Chip-enable input from µP | High-impedance during RESET; 75Ω series resistance in enabled mode |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; enables automatic switchover when VCC < VRST and VCC < VBATT |
| 8: OUT | Output supply to RAM and peripherals | Switches between VCC and VBATT; bypassed with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables robust operation across wide VCC tolerances (4.35V–5.5V) without external trimming |
| 18µs CE write-cycle completion hold | Prevents RAM data corruption by extending CE enable during mid-write brownout |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) with no external charging circuit needed |
| 1µA standby current in battery mode | Extends backup runtime for CMOS RAM retention during extended power loss |
| RESET guaranteed valid to VCC = 1V | Ensures deterministic reset assertion even during ultra-slow power ramp-down or deep brownout |
| 52mV low-line hysteresis margin | Provides clean separation between warning and reset events, avoiding chatter during VCC sag |
Applications
| Portable/Battery-Powered Equipment | Critical µP Power Monitoring |
|---|---|
Use Scenario: Handheld medical device operating from single Li-ion cell with buck-boost regulator delivering regulated +5V. IC Role / Device Role / Timing Role: Supervisory IC monitors VCC, asserts LOWLINE at 4.477V to initiate data save, then RESET at 4.425V if voltage continues falling. Use Value: Prevents data loss during battery depletion by enabling 100ms+ controlled shutdown before RAM supply collapse. |
Use Scenario: Industrial PLC controller with nonvolatile RAM requiring guaranteed write integrity during AC mains interruption. IC Role / Device Role / Timing Role: MAX808MESA+ gates CE signal and holds it active for 18µs after VCC crosses reset threshold, ensuring final RAM write completes. Use Value: Eliminates need for external hold-off circuitry; guarantees RAM write completion under worst-case brownout profiles. |
| Embedded Systems | Intelligent Instruments |
Use Scenario: Networked sensor node powered by energy harvesting, with intermittent +5V rail and backup supercapacitor. IC Role / Device Role / Timing Role: Provides seamless VCC-to-BATT switchover at 4.425V with 12Ω BATT-to-OUT resistance, sustaining 20mA RAM load. Use Value: Enables >24-hour RAM retention using 0.47F SuperCap without voltage regulation or charge management IC. |
Use Scenario: Bench multimeter with µP-controlled analog front-end and calibration memory. IC Role / Device Role / Timing Role: Generates precise 200ms RESET pulse on power-up and monitors VCC for low-line warning during battery discharge. Use Value: Ensures consistent boot state and prevents erroneous measurements during partial power failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809MESA+ | Single RESET output only; no LOWLINE, CE gating, or battery switchover - simplified 3-pin SOT23 variant | Suitable for basic reset-only applications without RAM protection or power-fail warning | Select MAX809MESA+ only if CE gating, low-line interrupt, and BATT switchover are unnecessary |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor); no battery switchover or CE gating; 200ms fixed delay | Used where programmable reset voltage is required, but lacks integrated RAM protection features | Choose TPS3808G12DBVR when threshold flexibility outweighs need for MAX808MESA+'s integrated BATT/CE functions |
Compared with MAX809MESA+, MAX808MESA+ adds critical RAM protection via CE gating and low-line warning; compared with TPS3808G12DBVR, it delivers fully integrated battery switchover and deterministic write-cycle completion-features not replicable with external components.
Availability
MAX808MESA+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical µP power monitoring, and embedded systems requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX808MESA+ 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, sensing, and interface applications, with emphasis on reliability and integration for demanding environments.
The MAX808MESA+ belongs to Maxim's µP supervisory product line, engineered specifically for systems requiring coordinated reset, low-line warning, and CMOS RAM protection in battery-backed +5V applications.
FAQ
What is the exact reset threshold voltage of the MAX808MESA+?
The MAX808MESA+ has a factory-trimmed reset threshold of 4.425V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is confirmed in the Electrical Characteristics table under "VRST" for suffix 'M', and is distinct from the L (4.675V) and N (4.575V) variants. The MAX808MESA+ maintains this precision without external calibration.
Does the MAX808MESA+ include a watchdog timer?
No, the MAX808MESA+ does not include a watchdog timer. That function is exclusive to the MAX801 family. The MAX808MESA+ focuses on reset supervision, low-line warning, battery switchover, and chip-enable gating for RAM protection - all confirmed in the General Description and Functional Diagram sections of the official datasheet.
How does the MAX808MESA+ handle CMOS RAM write cycles during power failure?
The MAX808MESA+ implements write-cycle completion logic: when VCC falls below the 4.425V reset threshold mid-write, it holds CE OUT enabled for exactly 18µs to allow the µP to complete the RAM write instruction. This behavior is explicitly documented in the "MAX808 Chip-Enable Gating" section and verified in Figure 6 timing diagrams.
What is the maximum continuous current supported by the MAX808MESA+ OUT pin?
The MAX808MESA+ supports 250mA continuous current from VCC to OUT and 20mA from BATT to OUT. These values are specified in the "Power Switching" feature list and confirmed in Absolute Maximum Ratings (VCC Continuous = 500mA, IBATT Continuous = 50mA) and Electrical Characteristics (VCC-to-OUT on-resistance = 1.2Ω typ. at 250mA).
Is the MAX808MESA+ compatible with SuperCap™ or MaxCap™ backup capacitors?
Yes, the MAX808MESA+ is explicitly designed for SuperCap™ and MaxCap™ compatibility, as stated in the Features list and Applications Information section. Its battery switchover hysteresis (VBATT vs. VCC) and wide VBATT operating range (2.0V–4.5V) enable direct use with 0.47F supercapacitors without external charging circuitry - validated in Figure 8 of the datasheet.
MAX808MESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX808MESA+ FAQ
1.How can I place an order for MAX808MESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808MESA+ 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 MAX808MESA+ reliable?
The price and inventory of MAX808MESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808MESA+ is usually 5 days.
3.What payment methods are accepted for MAX808MESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808MESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808MESA+?
MAX808MESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808MESA+ 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 MAX808MESA+?
For technical support, including MAX808MESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808MESA+ requirements.
6.How does Aetrix verify that MAX808MESA+ is sourced from the original manufacturer or authorized distributors?
All MAX808MESA+ 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 MAX808MESA+ meets industry standards.
7.What is the process for return or replacement of MAX808MESA+?
All MAX808MESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX808MESA+, 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 MAX808MESA+ part is unused and in its original packaging.
Return procedure for MAX808MESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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