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Analog Devices Inc./Maxim Integrated MAX808NCSA
- Part No.:
- MAX808NCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808NCSA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
MAX808NCSA from Maxim Integrated is a +5V microprocessor supervisory circuit with precision reset monitoring, battery switchover, and CMOS RAM write protection. It features ±1.5% reset threshold accuracy (4.575V), 200ms reset timeout, 1µA standby current, and active-low RESET output. It is used in portable/battery-powered equipment to ensure reliable power-up sequencing and orderly shutdown during brownout.
For engineers reviewing the MAX808NCSA datasheet, MAX808NCSA pinout, MAX808NCSA application, or MAX808NCSA equivalent, this page delivers verified functional identity, exact reset threshold and timing behavior, battery-backup switching characteristics, CE gating logic, and real-world design implications for RAM retention and NMI-triggered shutdown.
Technical Context
The MAX808NCSA implements three independent comparators: reset (4.575V ±1.5%), low-line (4.627V rising, 52mV above reset), and battery switchover (VBATT vs. VCC). Its internal timer guarantees 200ms RESET assertion after VCC rise above threshold or after low-line detection.
It integrates a CMOS transmission gate for chip-enable (CE) signal control, enabling write-cycle completion (18µs hold) and automatic CE OUT disable during reset. Unlike the MAX801, it omits watchdog functionality but adds dedicated CE IN/OUT pins and RAM write protection logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures µP reset before operation below safe voltage margin |
| RESET Timeout | 200ms minimum - provides sufficient time for µP initialization and state recovery |
| Low-Line Threshold | 4.627V (52mV above reset) - triggers NMI for controlled software shutdown prior to reset |
| Standby Current | 48µA typical at VCC = 5V - enables long battery life in always-on monitoring mode |
| Battery-Backup Current | <1µA at VBATT = 2.8V - preserves backup battery charge during extended power loss |
| VCC-to-OUT On-Resistance | 1.2Ω typical at IOUT = 250mA - limits voltage drop to ~300mV under full load |
| CE Propagation Delay | 3ns typical (50Ω source, 50pF load) - supports high-speed µP CE timing without skew |
Pinout & Package
MAX808NCSA is housed in an 8-pin SO (Small Outline) package, surface-mount, lead-free compatible, with standard 1.27mm pitch and JEDEC MS-012AC footprint.
| 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 low-voltage warning output | Drives µP NMI pin when VCC falls to 4.627V; enables graceful shutdown before reset |
| 3: RESET | Active-low reset output | Guaranteed valid down to 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 logic |
| 5: CE OUT | Chip-enable output to RAM | Pulled to higher of VCC/VBATT when disabled; passes CE transitions during normal operation |
| 6: CE IN | Chip-enable input from µP | High-impedance during reset; enables write-cycle completion (18µs hold) on power fall |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; switches RAM supply to battery when VCC < VRST and VCC < VBATT |
| 8: OUT | Output supply to RAM and peripherals | Switches between VCC and VBATT; bypassed with 0.1µF capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables precise brownout detection across temperature (-40°C to +85°C) |
| CMOS RAM write-cycle completion | Holds CE gate enabled for 18µs during VCC fall, preventing partial writes to volatile memory |
| Low-line comparator with 52mV hysteresis | Provides deterministic NMI timing window for shutdown routines before reset asserts |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) via hysteresis in battery switchover |
| RESET validity to VCC = 1V | Ensures reset assertion remains functional even during deep brownout or slow power ramp |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-powered handheld diagnostic units requiring data integrity during unexpected power loss. IC Role / Device Role / Timing Role: Supervises VCC, asserts LOWLINE for NMI-driven RAM save, then RESET after 200ms if recovery fails. Use Value: Prevents corrupted patient data by guaranteeing complete RAM write before power collapse. |
Use Scenario: DIN-rail mounted controllers operating in environments with unstable 24VDC supplies converted to +5V. IC Role / Device Role / Timing Role: Monitors regulated +5V rail; triggers controlled firmware halt via LOWLINE, then hard reset if voltage does not recover. Use Value: Eliminates spurious reboots during transient dips, improving system uptime and diagnostics reliability. |
| Smart Metering Modules | Embedded Point-of-Sale Terminals |
|
Use Scenario: Electricity meters with nonvolatile event logging that must retain timestamped outage records. IC Role / Device Role / Timing Role: Switches RAM supply from VCC to BATT at switchover threshold; gates CE to prevent partial writes during brownout. Use Value: Ensures atomic storage of outage start/end timestamps using internal 18µs CE hold and battery-backed RAM. |
Use Scenario: Credit card terminals powered by AC adapter with battery backup for transaction finalization. IC Role / Device Role / Timing Role: Generates LOWLINE interrupt to commit pending transaction to flash before RESET initiates safe shutdown. Use Value: Guarantees financial transaction atomicity by synchronizing hardware reset with firmware commit sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SCSA | Single-output (RESET only), no LOWLINE, no CE gating, no battery switchover; 4.63V threshold | Lacks NMI support and RAM write protection; suitable only for basic reset-only systems | Select when cost and board space constrain requirements to reset generation only |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor), no battery switchover, no CE function, 1.2V min VCC operation | Designed for low-voltage µPs (1.2–5.5V); incompatible with +5V-only battery-backup architecture | Choose for modern low-power SoC designs where adjustable threshold and ultra-low quiescent current (<1µA) are critical |
Compared with MAX808NCSA, MAX809SCSA omits critical battery-backup and CE-gating functions required for RAM retention, while TPS3808G12DBVR lacks integrated switchover and cannot replace the dual-supply control architecture of the MAX808NCSA in legacy +5V systems.
Availability
MAX808NCSA is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, smart metering modules, embedded point-of-sale terminals, and battery-backed data loggers requiring stable component supply across extended temperature ranges.
Supply support for MAX808NCSA 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 computing applications.
The MAX808NCSA belongs to Maxim's µP supervisory product line, designed specifically for robust power monitoring and battery-backed memory protection in +5V microprocessor systems operating from -40°C to +85°C.
FAQ
What is the exact reset threshold voltage of the MAX808NCSA?
The MAX808NCSA has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature (-40°C to +85°C). This value is fixed by the "N" suffix and confirmed in the Electrical Characteristics table of the official datasheet. The MAX808NCSA uses this precise threshold to initiate RESET when VCC falls below 4.575V, ensuring µP operation remains within its specified voltage range.
Does the MAX808NCSA include a watchdog timer?
No, the MAX808NCSA does not include a watchdog timer. That function is exclusive to the MAX801 family (e.g., MAX801NCSA). The MAX808NCSA is differentiated by its integrated chip-enable (CE) gating logic for RAM write-cycle completion and battery switchover-features absent in the MAX801. This makes the MAX808NCSA ideal for systems prioritizing data integrity over program-execution monitoring.
How does the MAX808NCSA handle CMOS RAM write protection during power failure?
The MAX808NCSA implements write-cycle completion by holding CE OUT enabled for 18µs after VCC falls below the reset threshold, allowing the µP to finish ongoing RAM writes. If the write completes within that window, CE OUT goes high immediately; otherwise, it disables after 18µs. This behavior is intrinsic to the MAX808NCSA and is not present in reset-only supervisors like the MAX809 series.
What is the maximum output current capability of the MAX808NCSA's OUT pin?
The MAX808NCSA's OUT pin supports up to 250mA in VCC mode and 20mA in battery-backup mode. At 250mA, the typical VCC-to-OUT on-resistance is 1.2Ω, resulting in ~300mV dropout. This rating is validated per Absolute Maximum Ratings and Electrical Characteristics tables and defines the MAX808NCSA's ability to power small RAM banks and interface logic without external regulation.
Can the MAX808NCSA be used with SuperCapacitors or MaxCapacitors?
Yes, the MAX808NCSA is explicitly MaxCap™/SuperCap™ compatible due to its battery switchover hysteresis (typically +50mV on rising VCC, -50mV on falling). This allows direct use with large-value backup capacitors (e.g., 0.47F) charged via simple diode circuits, as shown in Figure 8 of the datasheet. The MAX808NCSA's architecture eliminates need for external hysteresis components when implementing capacitor-based backup.
MAX808NCSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.575V
- Output:
- Push-Pull, Totem Pole
- 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
MAX808NCSA FAQ
1.How can I place an order for MAX808NCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808NCSA 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 MAX808NCSA reliable?
The price and inventory of MAX808NCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808NCSA is usually 5 days.
3.What payment methods are accepted for MAX808NCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808NCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808NCSA?
MAX808NCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808NCSA 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 MAX808NCSA?
For technical support, including MAX808NCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808NCSA requirements.
6.How does Aetrix verify that MAX808NCSA is sourced from the original manufacturer or authorized distributors?
All MAX808NCSA 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 MAX808NCSA meets industry standards.
7.What is the process for return or replacement of MAX808NCSA?
All MAX808NCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX808NCSA, 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 MAX808NCSA part is unused and in its original packaging.
Return procedure for MAX808NCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX808NCSA Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
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MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
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