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Analog Devices Inc./Maxim Integrated MAX808NCPA+
- Part No.:
- MAX808NCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX808NCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
The MAX808NCPA+ from Maxim Integrated is an 8-pin +5V microprocessor supervisory IC providing precision reset generation (4.575V threshold), battery switchover, low-line warning (LOWLINE), and CMOS RAM write protection via chip-enable gating. It guarantees valid RESET output down to VCC = 1V, supports 250mA VCC-to-OUT power delivery, and operates across –40°C to +85°C in plastic DIP packaging - used in portable instrumentation and embedded systems requiring reliable brownout recovery.
For engineers reviewing the MAX808NCPA+ datasheet, MAX808NCPA+ pinout, MAX808NCPA+ application, or MAX808NCPA+ equivalent, this page delivers verified functional role, exact reset threshold (4.575V ±1.5%), battery-backup timing behavior, CE gating propagation delay (≤8ns), and confirmed alternative options for critical µP power monitoring designs.
Technical Context
The MAX808NCPA+ integrates a precision voltage comparator with ±1.5% reset accuracy, a 200ms internal reset timeout timer, and a dedicated low-line comparator set 52mV above the reset threshold to trigger NMI-driven shutdown routines. Its dual-path power switch (VCC→OUT and BATT→OUT) uses PMOS pass elements with 1.0Ω typical on-resistance under VCC mode and 12Ω under battery mode.
Unlike the MAX801, the MAX808NCPA+ omits watchdog functionality but adds active chip-enable gating: CE IN passes through to CE OUT during normal operation, then disables upon RESET assertion - with 18µs write-cycle completion hold time to ensure RAM write integrity during power failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures deterministic µP reset before system instability at nominal +5V supply |
| RESET Timeout Delay | 200ms - provides sufficient deassertion hold time for full µP initialization after power recovery |
| LOWLINE Threshold | 4.627V (4.575V + 52mV) - triggers early non-maskable interrupt for orderly software shutdown |
| VCC-to-OUT On-Resistance | 1.0Ω typical - limits voltage drop to ≤250mV at 250mA load, preserving RAM supply integrity |
| Battery-Backup Current | ≤1µA standby - enables multi-year backup for CMOS RAM without significant battery drain |
| CE Propagation Delay | ≤8ns (50Ω source, 50pF load) - supports high-speed µP address/data bus timing without CE skew |
| Operating Temperature | –40°C to +85°C - qualified for industrial and extended-temperature embedded deployments |
Pinout & Package
MAX808NCPA+ is housed in an 8-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pins are numbered counterclockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | +5V main 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 when VCC falls to 4.627V; used to generate NMI for controlled shutdown before reset |
| 3: RESET | Active-low reset output | Guaranteed logic low for VCC ≥1V; holds low ≥200ms after VCC rises above 4.575V |
| 4: GND | Signal and power ground reference | 0V return path for all analog comparators, digital outputs, and bypass capacitors |
| 5: CE OUT | Chip-enable output to RAM | Pulled high to VCC/VBATT when disabled; passes CE IN signal during normal operation |
| 6: CE IN | Chip-enable input from µP | High-impedance during RESET; enables CE gating with 75Ω series resistance in active mode |
| 7: BATT | Backup battery input | Accepts 2.0V–6V; switches OUT to battery when VCC < 4.575V and VCC < VBATT |
| 8: OUT | Output supply to RAM and peripherals | Delivers power from VCC or BATT; requires 0.1µF decoupling to GND |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Reduces false resets and extends usable supply range vs. ±2.5% competitors |
| 18µs CE write-cycle completion hold | Ensures RAM write completion during brownout, preventing data corruption without µP intervention |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) with no external charge control circuitry |
| RESET validity to VCC = 1V | Enables robust reset assertion even during deep brownout or slow power ramp-down |
| 1µA battery-backup standby current | Extends CR2032 or similar coin-cell life to >10 years in always-on memory retention applications |
Applications
| Portable Data Loggers | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered field instruments logging sensor data over weeks without mains power. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, low-line NMI warning, and RAM backup switchover. Use Value: Prevents corrupted log entries during voltage sag by holding CE until write completes and asserting RESET only after stable recovery. |
Use Scenario: Programmable logic controllers operating in factory environments with fluctuating 24VDC-derived +5V rails. IC Role / Device Role / Timing Role: Power monitor ensuring deterministic µP restart and RAM retention during line dips or switching noise. Use Value: Guarantees 200ms reset pulse width and 1µA battery drain - enabling fail-safe state recovery without external supervision logic. |
| Medical Handheld Diagnostics | Automotive Infotainment Modules |
Use Scenario: FDA-cleared handheld devices performing real-time ECG analysis with persistent settings storage. IC Role / Device Role / Timing Role: Reset generator and RAM protector with precise 4.575V threshold aligned to Li-ion discharge profile. Use Value: Matches battery voltage decay curve to avoid premature reset while ensuring operation remains within ADC/processor spec limits. |
Use Scenario: In-vehicle infotainment units exposed to cold-crank (4.5V) and load-dump (18V) transients. IC Role / Device Role / Timing Role: Supervisory interface between power management IC and application processor. Use Value: Tolerates VCC down to 1V while maintaining valid RESET, enabling graceful firmware save before hard power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809NPA+ | Single-output (RESET only), no LOWLINE, no CE gating, same 4.575V threshold and 200ms timeout | Lacks low-line warning and RAM write protection - suitable only for basic reset-only use cases | Select when space, cost, or design simplicity outweigh need for NMI or CE control |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor), 200ms timeout, no battery switchover or CE gating | Requires external components for threshold setting; not designed for backup-battery systems | Choose for flexible threshold tuning in non-battery-backed +3.3V/+5V systems |
Compared with MAX809NPA+, the MAX808NCPA+ adds LOWLINE and CE gating for enhanced system reliability; compared with TPS3808G12DBVR, it integrates battery switchover and write-cycle hold - making it uniquely suited for portable +5V µP systems requiring zero-external-component RAM backup.
Availability
MAX808NCPA+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, medical diagnostics, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX808NCPA+ 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 management, sensing, and interface applications - with emphasis on high-reliability, low-power, and industrial-grade performance.
The MAX808NCPA+ belongs to Maxim's µP supervisory product line, engineered specifically for +5V microprocessor systems needing guaranteed reset behavior, battery-backed RAM retention, and deterministic low-voltage warning - targeting portable, industrial, and medical equipment.
FAQ
What is the exact reset threshold voltage of the MAX808NCPA+?
The MAX808NCPA+ has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature and supply variations. This value is fixed by internal laser trimming and confirmed in the Electrical Characteristics table under "VRST" for suffix 'N'. The threshold remains stable across the –40°C to +85°C operating range, with typical drift less than 10mV over temperature.
Does the MAX808NCPA+ include a watchdog timer function?
No, the MAX808NCPA+ does not include a watchdog timer. That feature is exclusive to the MAX801 family (e.g., MAX801NCPA+). The MAX808NCPA+ focuses on reset supervision, low-line detection, battery switchover, and chip-enable gating - omitting watchdog circuitry to reduce complexity and cost for applications where software execution monitoring is handled externally.
How does the CE gating in MAX808NCPA+ protect CMOS RAM during power failure?
The MAX808NCPA+ monitors CE IN and holds CE OUT active for 18µs after RESET assertion begins, allowing ongoing RAM write cycles to complete. If the µP finishes the write before 18µs, CE OUT goes high immediately; otherwise, it goes high at 18µs. This prevents partial writes and data corruption - a hardware-level safeguard independent of µP firmware response time.
Can the MAX808NCPA+ operate with SuperCap™ or MaxCap™ backup capacitors?
Yes, the MAX808NCPA+ is explicitly MaxCap™/SuperCap™ compatible per its datasheet. Its battery switchover comparator includes hysteresis (VBATT + 0.05V on rising VCC) that accommodates slow-charging supercapacitors. No external charging circuitry is needed - a simple diode or resistor-based charger suffices, as shown in Figure 8 of the MAX808 datasheet.
What is the maximum load current supported by the OUT pin of MAX808NCPA+?
The MAX808NCPA+ supports up to 250mA from VCC to OUT in normal operating mode, with typical VCC-to-OUT voltage drop of 220mV at that load (1.0Ω on-resistance). In battery-backup mode, it delivers up to 20mA from BATT to OUT, with ~12Ω on-resistance - sufficient for retaining SRAM but not for powering active logic.
MAX808NCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.575V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX808NCPA+ FAQ
1.How can I place an order for MAX808NCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808NCPA+ 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 MAX808NCPA+ reliable?
The price and inventory of MAX808NCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808NCPA+ is usually 5 days.
3.What payment methods are accepted for MAX808NCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808NCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808NCPA+?
MAX808NCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808NCPA+ 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 MAX808NCPA+?
For technical support, including MAX808NCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808NCPA+ requirements.
6.How does Aetrix verify that MAX808NCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX808NCPA+ 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 MAX808NCPA+ meets industry standards.
7.What is the process for return or replacement of MAX808NCPA+?
All MAX808NCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX808NCPA+, 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 MAX808NCPA+ part is unused and in its original packaging.
Return procedure for MAX808NCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX808NCPA+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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