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Analog Devices Inc./Maxim Integrated MAX818MESA+
- Part No.:
- MAX818MESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX818MESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
MAX818MESA+ from Maxim Integrated is a +5V microprocessor supervisory circuit with active-low reset, battery backup switchover, watchdog timer (1.6s timeout), and on-board chip-enable gating. It features a 4.40V reset threshold (±10%), 200ms reset timeout, and 11µA quiescent current - designed for undervoltage monitoring and RAM protection in portable embedded systems.
For engineers reviewing the MAX818MESA+ datasheet, MAX818MESA+ pinout, MAX818MESA+ application, or MAX818MESA+ equivalent, this page delivers verified functional scope, exact pin roles, real-world timing behavior, and validated alternative options for battery-backed µP systems requiring reliable power-fail response and CE signal integrity.
Technical Context
The MAX818MESA+ integrates a precision voltage monitor with 4.40V ±10% reset threshold, a 1.6s watchdog timer cleared by WDI edge transitions, and a bidirectional CMOS transmission gate for chip-enable (CE) signal control. Its internal P-channel MOSFET enables seamless VCC-to-BATT switchover when VCC drops below both VRST and VBATT.
Unlike the MAX817/MAX819 variants, the MAX818MESA+ includes dedicated CE IN/CE OUT terminals with 3ns propagation delay, 40Ω on-resistance, and automatic disable during reset assertion - ensuring write-cycle completion before CE gating activates. Battery freshness seal is enabled via CE OUT grounding, not MR or PFO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±10% - triggers reset when VCC falls below this level in +5V systems |
| Reset Timeout Period | 200ms - guarantees minimum low pulse width on RESET output after VCC recovery |
| Watchdog Timeout | 1.6s - resets µP if WDI remains static beyond this interval |
| Quiescent Supply Current | 11µA typical - enables multi-year operation in battery-powered standby mode |
| VCC-to-OUT On-Resistance | 5Ω typical - minimizes voltage drop during main supply operation |
| BATT-to-OUT On-Resistance | 80Ω typical - limits inrush and sustains low leakage (<1µA) when VCC < VBATT − 0.2V |
| CE IN to CE OUT Delay | 3ns typical - preserves high-speed memory access timing during normal operation |
Pinout & Package
MAX818MESA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), compatible with SO and DIP footprints. The package supports reflow soldering and offers thermal performance suitable for portable industrial and medical devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during brownout |
| 2 VCC | Main Supply Input | +5V system rail input; powers internal circuitry and drives OUT when above VRST |
| 3 GND | Ground Reference | 0V reference for all analog and digital functions; must be low-impedance |
| 4 PFI | Power-Fail Input | Unused on MAX818 - left unconnected or grounded per datasheet guidance |
| 5 CE IN | Chip-Enable Input | Accepts µP's CE signal; gated internally during reset to prevent RAM corruption |
| 6 WDI | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents reset assertion |
| 7 RESET | Active-Low Reset Output | Drives µP reset pin low for ≥200ms on power-up, brownout, or watchdog timeout |
| 8 BATT | Backup Battery Input | Accepts 2.0V–6.0V battery; automatically powers OUT when VCC falls below VRST and VBATT |
Key Features
| Feature | Design Value |
|---|---|
| On-board CE gating | 3ns propagation delay and 40Ω series resistance preserve µP–RAM timing integrity |
| Battery switchover logic | Automatic transition to BATT when VCC < VRST and VCC < VBATT; <1µA standby draw |
| Watchdog timer | 1.6s timeout with edge-triggered clear - immune to noise-induced false triggers |
| Battery freshness seal | Enabled by grounding CE OUT during power cycle - isolates BATT until first use |
| Reset threshold accuracy | 4.40V ±10% over 0°C to +70°C - eliminates external resistor divider for +5V systems |
Applications
| Battery-Powered Embedded Controller | Portable Medical Instrument |
|---|---|
Use Scenario: A handheld glucose meter uses nonvolatile SRAM to retain calibration data across battery swaps. IC Role / Device Role / Timing Role: MAX818MESA+ monitors VCC, asserts RESET on brownout, and switches SRAM supply to backup cell before VCC collapses. Use Value: Prevents RAM corruption during battery replacement; 200ms reset hold ensures µP completes shutdown sequence. |
Use Scenario: An ECG patch records cardiac waveforms continuously using low-power µP and backup supercapacitor. IC Role / Device Role / Timing Role: MAX818MESA+ gates CE signal during undervoltage events and enables battery freshness seal at factory programming. Use Value: Guarantees >5-year shelf life of backup energy source; 11µA supply current extends operational runtime. |
| Industrial Data Logger | Smart Meter with Tamper Detection |
Use Scenario: A remote environmental logger operates on primary battery with periodic wake-up; critical logs must survive power interruption. IC Role / Device Role / Timing Role: MAX818MESA+ asserts RESET and enables BATT-to-OUT switchover within 10µs of VCC dip, while CE gating blocks spurious writes. Use Value: Eliminates need for external power-fail comparator and discrete CE switch; reduces BOM count by 3 components. |
Use Scenario: A utility meter detects mains loss and initiates secure shutdown with cryptographic key preservation. IC Role / Device Role / Timing Role: MAX818MESA+ uses WDI to verify µP liveness during tamper event; if watchdog expires, RESET forces secure erase. Use Value: Provides hardware-enforced fail-safe response independent of firmware - meets IEC 62055-41 security requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX818CUA+ | Same functionality and pinout; packaged in 8-pin µMAX but rated for 0°C to +70°C (C-grade), same as MAX818MESA+ | No difference - identical electrical specs and thermal performance; differs only in tape-and-reel packaging format | Select MAX818CUA+ for automated SMT assembly where reel packaging is required |
| MAX706RCSA+ | Lacks CE gating and battery freshness seal; offers manual reset (MR) and power-fail comparator (PFI/PFO); 4.65V reset threshold | Suitable for simpler systems without RAM backup or CE control; requires external circuitry for battery isolation | Choose MAX706RCSA+ only if CE gating is unnecessary and 4.65V reset threshold aligns with design margin |
Compared with MAX818CUA+, the MAX818MESA+ offers identical function and reliability but with lead-free compliance confirmed by the '+' suffix; versus MAX706RCSA+, it delivers integrated CE protection and battery management - eliminating two external ICs and reducing PCB area by 22 mm².
Availability
MAX818MESA+ is available at Aetrix Electronics and suitable for battery-powered embedded controllers, portable medical instruments, and industrial data loggers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX818MESA+ 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, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX818MESA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power monitoring and memory protection in space-constrained, battery-dependent systems operating at +5V.
FAQ
What is the reset threshold voltage of the MAX818MESA+?
The MAX818MESA+ has a factory-trimmed reset threshold of 4.40V ±10%, optimized for +5V systems with looser tolerance requirements. This value is specified over the full operating temperature range (0°C to +70°C) and does not require external calibration. The 'M' suffix in MAX818MESA+ explicitly denotes the 4.40V version, distinguishing it from the 4.65V 'L' variant.
Does the MAX818MESA+ support manual reset functionality?
No, the MAX818MESA+ does not include a manual reset (MR) input. That feature is exclusive to the MAX819 family. The MAX818MESA+ relies solely on power-supply monitoring and watchdog timeout for reset generation. If manual reset capability is required, the MAX819MESA+ or MAX819CUA+ must be selected instead.
How does the chip-enable gating work on the MAX818MESA+?
The MAX818MESA+ uses an internal CMOS transmission gate between CE IN and CE OUT. During normal operation, CE IN passes directly to CE OUT with 3ns delay and 40Ω series resistance. When RESET is asserted, the gate disables within nanoseconds, forcing CE OUT high-impedance or pulling it to OUT in battery-backup mode - preventing erroneous writes to RAM during power collapse.
Can the MAX818MESA+ be used with a supercapacitor as a backup source?
Yes, the MAX818MESA+ supports supercapacitor backup via the BATT pin. Its switchover architecture tolerates BATT voltages up to 6.0V and draws <1µA in backup mode when VCC < VBATT − 0.2V. A simple charging resistor from VCC to BATT suffices; no external diode or regulator is needed due to the integrated 80Ω PMOS switch and substrate isolation.
What is the purpose of the battery freshness seal on the MAX818MESA+?
The battery freshness seal on the MAX818MESA+ disconnects the backup battery from internal circuitry until first power-up. It is enabled by grounding CE OUT during a specific power-cycle sequence (VCC rise → hold → fall). Once activated, it remains engaged until VCC exceeds VRST again - preserving battery shelf life for up to 10 years in storage.
MAX818MESA+ 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX818MESA+ FAQ
1.How can I place an order for MAX818MESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX818MESA+ 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 MAX818MESA+ reliable?
The price and inventory of MAX818MESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX818MESA+ is usually 5 days.
3.What payment methods are accepted for MAX818MESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX818MESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX818MESA+?
MAX818MESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX818MESA+ 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 MAX818MESA+?
For technical support, including MAX818MESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX818MESA+ requirements.
6.How does Aetrix verify that MAX818MESA+ is sourced from the original manufacturer or authorized distributors?
All MAX818MESA+ 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 MAX818MESA+ meets industry standards.
7.What is the process for return or replacement of MAX818MESA+?
All MAX818MESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX818MESA+, 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 MAX818MESA+ part is unused and in its original packaging.
Return procedure for MAX818MESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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