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Analog Devices Inc./Maxim Integrated MAX808MCSA+
- Part No.:
- MAX808MCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808MCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,348
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Product details
Overview
MAX808MCSA+ from Maxim Integrated is an 8-pin microprocessor supervisory IC designed for +5V systems, providing precision reset generation (±1.5% accuracy), battery-backed power switchover (250mA VCC / 20mA BATT mode), and CMOS RAM write-cycle completion via chip-enable gating. It features a 4.425V reset threshold (suffix 'M'), 200ms reset timeout, and guaranteed RESET validity down to VCC = 1V - used in portable instrumentation and embedded controllers requiring reliable brownout recovery.
For engineers reviewing the MAX808MCSA+ datasheet, MAX808MCSA+ pinout, MAX808MCSA+ application, or MAX808MCSA+ equivalent, key selection criteria include its ±1.5% reset threshold tolerance, 3ns CE propagation delay, low-line comparator (52mV above reset), battery-switchover hysteresis, and absence of watchdog functionality - distinguishing it from the MAX801 family.
Technical Context
The MAX808MCSA+ implements dual-voltage monitoring: a primary reset comparator with 4.425V threshold (±1.5%) and a secondary low-line comparator set 52mV higher to trigger NMI before reset. Its BiCMOS process enables 48µA typical supply current in normal operation and <1µA battery-standby current.
It integrates a bidirectional power switch (VCC↔OUT and BATT↔OUT) with 1.0Ω VCC-to-OUT on-resistance and 12Ω BATT-to-OUT on-resistance, plus a dedicated CE gating path with 3ns propagation delay and 18µs write-cycle hold time - all controlled by internal state logic synchronized to VCC transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures µP reset occurs only when VCC falls below system's minimum operational voltage with tight tolerance. |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization after power-up or brownout recovery. |
| Low-Line Threshold | 4.477V (4.425V + 52mV) - provides early warning interrupt (NMI) for orderly software shutdown before reset asserts. |
| VCC-to-OUT On-Resistance | 1.0Ω max - limits voltage drop to ≤250mV at 250mA load, preserving RAM supply integrity. |
| BATT-to-OUT On-Resistance | 12Ω max - supports up to 20mA backup current while maintaining ≥2.5V output at 2.8V battery input. |
| CE Propagation Delay | 3ns - enables compatibility with high-speed µPs by minimizing gating latency during normal memory access. |
| Supply Current (Normal Mode) | 48µA typical - minimizes quiescent power draw in always-on embedded systems. |
Pinout & Package
MAX808MCSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Main +5V supply input | Bypassed with 0.1µF capacitor; powers internal circuitry and drives OUT during normal operation. |
| 2: LOWLINE | Active-low low-voltage warning output | Asserts low at 4.477V to trigger NMI; swings rail-to-rail between VCC and GND. |
| 3: RESET | Active-low reset output | Guaranteed valid down to VCC = 1V; strong pull-down/weak pull-up structure supports wire-OR configuration. |
| 4: GND | Signal and power ground reference | 0V reference for all comparators, outputs, and internal logic; requires low-impedance connection. |
| 5: CE OUT | Chip-enable output to RAM | Pulled to higher of VCC/BATT when disabled; passes CE IN signal with 3ns delay during normal operation. |
| 6: CE IN | Chip-enable input from µP | High-impedance during reset; enables write-cycle hold (18µs) if VCC drops mid-write. |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; switches OUT to battery when VCC < VRST and VCC < VBATT. |
| 8: OUT | Output supply to RAM and peripherals | Delivers regulated power from VCC or BATT; bypassed with 0.1µF capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables precise brownout detection across temperature (-40°C to +85°C), reducing false resets in margin-constrained designs. |
| CMOS RAM write-cycle completion | 18µs CE gate hold time prevents data corruption during power failure, eliminating need for external hold circuitry. |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) with no external charging control, simplifying battery-replacement-free designs. |
| RESET validity to VCC = 1V | Ensures deterministic reset assertion even during deep brownout, critical for nonvolatile memory retention. |
| Low-line comparator with 52mV offset | Provides 17µs advance warning before reset, enabling firmware-controlled graceful shutdown without hardware timers. |
Applications
| Portable Medical Instrumentation | Industrial PLC Controller Modules |
|---|---|
Use Scenario: Handheld blood glucose meters and ECG monitors powered by single-cell Li-ion batteries with intermittent USB charging. IC Role / Device Role / Timing Role: Supervises VCC during battery discharge and USB hot-plug events; triggers LOWLINE NMI to save calibration data before reset. Use Value: Prevents RAM corruption during 100ms–500ms brownout windows using 18µs CE hold and 200ms reset timeout. |
Use Scenario: DIN-rail mounted programmable logic controllers operating in factory environments with noisy 24V DC supplies. IC Role / Device Role / Timing Role: Monitors 5V logic rail derived from DC-DC converter; asserts RESET on line sag and LOWLINE for predictive maintenance alerts. Use Value: ±1.5% reset accuracy avoids nuisance resets caused by ±3% supply ripple, improving system uptime. |
| Smart Energy Metering Hardware | Automotive Infotainment Head Units |
Use Scenario: ANSI C12.20-compliant electricity meters with supercapacitor backup for last-gasp event logging during AC mains loss. IC Role / Device Role / Timing Role: Switches RAM supply from VCC to SuperCap™ upon brownout; holds CE gate for full write cycle completion. Use Value: 12Ω BATT-to-OUT resistance sustains >2.5V at 15mA for 30+ seconds, meeting ANSI 10-second minimum data retention requirement. |
Use Scenario: In-vehicle navigation systems subject to cold-crank (4.5V–6.5V transients) and load-dump conditions. IC Role / Device Role / Timing Role: Provides robust reset timing independent of MCU internal LDO behavior; uses LOWLINE to initiate EEPROM save before ignition-off. Use Value: RESET guaranteed valid to VCC = 1V ensures deterministic reset during 4.0V cold-crank dips, preventing boot-loop failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809MCSA+ | Single-output (RESET only); no LOWLINE, CE gating, or battery switchover - lacks all MAX808-specific functions. | Suitable only for basic reset-only applications; cannot replace MAX808MCSA+ in RAM backup or NMI-driven shutdown designs. | Select only if system requires only reset assertion and has no battery backup or orderly shutdown requirements. |
| TPS3808G12DBVR | Fixed 3.08V reset threshold; no low-line output; no battery switchover; 200ms timeout; 1.6µA quiescent current. | Targeted at low-power 3.3V systems; incompatible with +5V VCC operation and RAM backup architecture. | Consider only for new 3.3V designs where ultra-low supply current outweighs need for dual-voltage monitoring and backup switching. |
Compared with MAX809MCSA+, MAX808MCSA+ adds essential functionality for battery-backed RAM systems - including LOWLINE NMI signaling, CE gating with write-cycle hold, and seamless VCC/BATT switchover - while TPS3808G12DBVR trades these capabilities for lower quiescent current in non-backup 3.3V applications.
Availability
MAX808MCSA+ is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC controller modules, smart energy metering hardware, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX808MCSA+ 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, communications, and consumer applications.
The MAX808 belongs to Maxim's µP supervisory product line, engineered specifically for +5V microprocessor systems needing precision reset, battery-backed RAM protection, and early power-fail warning - targeting portable, industrial, and metering equipment.
FAQ
What is the reset threshold voltage of the MAX808MCSA+?
The MAX808MCSA+ has a nominal reset threshold voltage of 4.425V with ±1.5% accuracy over temperature (-40°C to +85°C). This value is fixed by the 'M' suffix in the part number and is confirmed in the Electrical Characteristics table of the official datasheet. The MAX808MCSA+ does not support user-adjustable thresholds or external resistor programming.
Does the MAX808MCSA+ include a watchdog timer?
No, the MAX808MCSA+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX801 series (e.g., MAX801MCSA+). The MAX808MCSA+ is differentiated by its integrated chip-enable (CE) gating and write-cycle completion feature, not watchdog monitoring. This distinction is explicitly stated in the General Description and Functional Diagram sections of the datasheet.
What is the purpose of the LOWLINE output on the MAX808MCSA+?
The LOWLINE output on the MAX808MCSA+ is an active-low comparator that asserts when VCC falls to 52mV above the reset threshold (i.e., 4.477V for the 'M' version). Its design purpose is to generate a non-maskable interrupt (NMI) to the microprocessor, enabling firmware-initiated orderly shutdown before RESET is asserted - providing critical time to save volatile data or enter safe states.
Can the MAX808MCSA+ be used with supercapacitors for backup power?
Yes, the MAX808MCSA+ is explicitly MaxCap™/SuperCap™ compatible per the datasheet. Its battery-switchover comparator includes hysteresis (VBATT + 0.05V on rising VCC) that accommodates slow-charging supercaps, and the BATT pin accepts voltages up to 4.5V. A typical implementation uses a 0.47F supercap with a series diode, as shown in Figure 8 of the datasheet.
What is the maximum load current supported by the OUT pin of the MAX808MCSA+?
The OUT pin of the MAX808MCSA+ supports up to 250mA when powered from VCC (with ≤220mV dropout at full load) and up to 20mA when powered from the BATT input (with ≥2.5V output at 2.8V battery input). These values are specified in the Absolute Maximum Ratings and Electrical Characteristics tables, and exceed typical CMOS RAM supply requirements.
MAX808MCSA+ 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:
- 4.425V
- 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
MAX808MCSA+ FAQ
1.How can I place an order for MAX808MCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808MCSA+ 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+ reliable?
The price and inventory of MAX808MCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808MCSA+ is usually 5 days.
3.What payment methods are accepted for MAX808MCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808MCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808MCSA+?
MAX808MCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808MCSA+ 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+?
For technical support, including MAX808MCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808MCSA+ requirements.
6.How does Aetrix verify that MAX808MCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX808MCSA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX808MCSA+?
All MAX808MCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX808MCSA+, 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+ part is unused and in its original packaging.
Return procedure for MAX808MCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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