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Analog Devices Inc./Maxim Integrated MAX808NCSA+T
- Part No.:
- MAX808NCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808NCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,708
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Product details
Overview
MAX808NCSA+T from Maxim Integrated is an 8-pin SO-package microprocessor supervisory circuit designed for +5V systems, providing precision reset generation (4.575V threshold, ±1.5% accuracy), battery-backed power switchover (20mA max), and CMOS RAM write-cycle protection via CE gating. It delivers guaranteed RESET validity down to VCC = 1V and integrates a low-line comparator (52mV above reset) for orderly shutdown in portable/battery-powered equipment.
For engineers reviewing the MAX808NCSA+T datasheet, MAX808NCSA+T pinout, MAX808NCSA+T application, or MAX808NCSA+T equivalent, this page details its role in critical µP power monitoring, backup-battery management, and RAM write-cycle completion - with verified timing (200ms reset timeout), on-resistance (1.2Ω VCC→OUT), and CE propagation delay (3ns).
Technical Context
The MAX808NCSA+T implements a precision voltage-monitoring architecture with independent comparators for reset (VRST = 4.575V), low-line (VLL = 4.627V), and battery switchover (VBATT threshold hysteresis = 50mV). Its internal 200ms reset timeout timer ensures reliable µP initialization after power-up or brownout recovery.
Unlike the MAX801, the MAX808NCSA+T omits watchdog functionality but adds dedicated chip-enable gating logic: CE IN → CE OUT transmission gate with 3ns typical propagation delay, 18µs write-cycle hold, and active-high CE OUT pulled to the higher of VCC or VBATT during reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - guarantees deterministic µP reset before system instability at nominal +5V supply |
| Reset Timeout Period | 200ms - ensures sufficient time for µP and peripherals to stabilize post-power-up or brownout |
| VCC to OUT On-Resistance | 1.2Ω (typ) - limits voltage drop to ≤220mV at 250mA load, preserving RAM supply integrity |
| CE Propagation Delay | 3ns (typ) - enables compatibility with high-speed µPs without timing violation in normal operation |
| Standby Current | 48µA (typ) - minimizes quiescent draw in always-on embedded control applications |
| Battery Backup Current | <1µA (typ) - extends shelf life of backup batteries in long-term storage or infrequent use |
| Low-Line Threshold | 4.627V (52mV above reset) - provides early NMI warning to initiate controlled software shutdown before reset |
Pinout & Package
MAX808NCSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (+T suffix), footprint-compatible with industry-standard SOIC-8 layouts.
| 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 NMI output | Asserts low 17µs after VCC falls to 4.627V; triggers µP shutdown routine |
| 3: RESET | Active-low reset output | Guaranteed valid down to VCC = 1V; strong pull-down/weak pull-up supports wire-OR |
| 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 high to higher of VCC/VBATT during reset; gated pass-through otherwise |
| 6: CE IN | Chip-enable input from µP | High-impedance during reset; enables write-cycle completion hold (18µs) |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; switches OUT source when VCC < VRST and VCC < VBATT |
| 8: OUT | RAM supply output | Delivers power from VCC (250mA) or BATT (20mA); bypassed with 0.1µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables stable operation across full industrial temperature range (-40°C to +85°C) without calibration |
| CMOS RAM write-cycle completion | Holds CE gate enabled for 18µs during VCC brownout, ensuring data integrity on last RAM write |
| MaxCap™/SuperCap™ compatibility | Supports large-capacitance backup sources (e.g., 0.47F) with no external circuitry or voltage limiting |
| RESET validity to VCC = 1V | Permits robust reset assertion even during deep brownout or slow power ramp-down |
| Low-line comparator with 52mV offset | Provides deterministic 17µs advance warning before reset, enabling safe state save and peripheral disable |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose monitors and handheld diagnostic tools requiring nonvolatile RAM retention during battery swaps or low-voltage conditions. IC Role / Device Role / Timing Role: MAX808NCSA+T acts as power-fail supervisor and RAM write protector, asserting LOWLINE for firmware-initiated data save and holding CE OUT active for final write completion. Use Value: Prevents RAM corruption during hot battery replacement by guaranteeing 18µs CE gate hold and validating RESET down to 1V. |
Use Scenario: DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings and intermittent AC line drops. IC Role / Device Role / Timing Role: MAX808NCSA+T monitors 5V logic rail, generates precise reset on brownout, and isolates RAM access during power transients using CE gating. Use Value: Eliminates spurious resets from 3µs/40mV VCC glitches while ensuring deterministic 200ms reset timeout for full controller reboot. |
| Smart Energy Meters | Embedded Point-of-Sale Terminals |
Use Scenario: Utility meters with supercapacitor backup that must retain tariff data and metering registers during grid outages. IC Role / Device Role / Timing Role: MAX808NCSA+T manages seamless switchover from mains-derived 5V to SuperCap™ backup, maintaining RAM voltage via low-Rds(on) OUT path. Use Value: Achieves <1µA battery-backup current and 12Ω BATT→OUT resistance, extending supercap runtime by >30% vs. discrete solutions. |
Use Scenario: Credit card terminals powered by wall adapter with Li-ion backup, requiring secure transaction logging during unexpected power loss. IC Role / Device Role / Timing Role: MAX808NCSA+T triggers LOWLINE NMI to flush pending transaction logs to EEPROM and asserts RESET only after safe shutdown completes. Use Value: Uses 52mV low-line hysteresis to decouple warning from reset, enabling 100% reliable log persistence across 100,000+ power cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SOT+T | Single active-low reset output only; no LOWLINE, CE gating, or battery switchover | Suitable for basic reset-only systems without RAM protection or power-fail warning | Select MAX809SOT+T only if CE gating, low-line NMI, and backup power management are unnecessary |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor); 3.3V/5V compatible; no CE gating or BATT support | Designed for flexible voltage monitoring in mixed-supply systems, not battery-backed RAM | Choose TPS3808G12DBVR when threshold tuning or dual-supply compatibility outweighs integrated RAM protection |
Compared with MAX809SOT+T and TPS3808G12DBVR, the MAX808NCSA+T uniquely integrates battery switchover, CE write-cycle hold, and low-line warning - making it irreplaceable in applications requiring guaranteed RAM data integrity during power transitions.
Availability
MAX808NCSA+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, smart energy meters, and embedded point-of-sale terminals requiring stable component supply with long lifecycle support.
Supply support for MAX808NCSA+T 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 demanding industrial, automotive, and computing applications, emphasizing reliability, accuracy, and integration.
The MAX808NCSA+T belongs to Maxim's µP supervisory product line, engineered specifically for systems requiring coordinated power monitoring, battery backup, and nonvolatile memory protection in space-constrained, battery-sensitive environments.
FAQ
What is the exact reset threshold voltage of the MAX808NCSA+T?
The MAX808NCSA+T has a factory-trimmed 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 under VRST parameter. The MAX808NCSA+T does not support adjustable thresholds or external resistor programming.
Does the MAX808NCSA+T include a watchdog timer function?
No, the MAX808NCSA+T does not include a watchdog timer. That feature is exclusive to the MAX801 family. The MAX808NCSA+T focuses on reset supervision, low-line warning, battery switchover, and CE gating - omitting WDI input and associated timing circuitry entirely.
How does the MAX808NCSA+T protect CMOS RAM during power failure?
The MAX808NCSA+T protects CMOS RAM using two mechanisms: (1) CE gating - holding CE OUT active for 18µs after VCC crosses the reset threshold to complete ongoing writes; and (2) battery switchover - automatically routing OUT supply from VCC to BATT when VCC falls below both VRST and VBATT, preserving RAM voltage.
What is the maximum load current supported by the MAX808NCSA+T's OUT pin?
The MAX808NCSA+T supports up to 250mA from VCC to OUT in normal operation (with ≤220mV drop at full load) and up to 20mA from BATT to OUT in backup mode. Exceeding these currents risks exceeding on-resistance limits and thermal dissipation, potentially causing malfunction or damage.
Is the MAX808NCSA+T compatible with supercapacitors for backup power?
Yes, the MAX808NCSA+T is explicitly MaxCap™/SuperCap™ compatible per its datasheet. Its battery switchover comparator includes hysteresis (50mV) and accepts VBATT up to 4.5V, enabling direct connection to 0.47F supercaps charged via simple resistor-diode circuits without additional regulation or protection.
MAX808NCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX808NCSA+T FAQ
1.How can I place an order for MAX808NCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808NCSA+T 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+T reliable?
The price and inventory of MAX808NCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808NCSA+T is usually 5 days.
3.What payment methods are accepted for MAX808NCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808NCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808NCSA+T?
MAX808NCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808NCSA+T 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+T?
For technical support, including MAX808NCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808NCSA+T requirements.
6.How does Aetrix verify that MAX808NCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX808NCSA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX808NCSA+T?
All MAX808NCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX808NCSA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX808NCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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