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Analog Devices Inc./Maxim Integrated MAX808LCPA+
- Part No.:
- MAX808LCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX808LCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:424
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Product details
Overview
MAX808LCPA+ from Maxim Integrated is an 8-pin +5V microprocessor supervisory IC providing precision reset generation (±1.5% accuracy), backup-battery switchover (250mA VCC / 20mA battery mode), and CMOS RAM write protection via chip-enable gating. It features a 4.675V reset threshold, 200ms reset timeout, and guaranteed RESET validity down to VCC = 1V - used in portable equipment for reliable brownout recovery and memory retention.
For engineers reviewing the MAX808LCPA+ datasheet, MAX808LCPA+ pinout, MAX808LCPA+ application, or MAX808LCPA+ equivalent, this page delivers verified functional identity, exact package mapping (8-pin PDIP), confirmed pin roles (e.g., CE IN/OUT, LOWLINE, BATT), real-world timing behavior (18µs write-cycle completion), and validated alternatives for industrial embedded and battery-powered µP systems.
Technical Context
The MAX808LCPA+ implements a dedicated low-line comparator with 52mV hysteresis above its 4.675V reset threshold to generate early NMI warnings before reset assertion. Its internal power-switching architecture uses PMOS pass elements to route VCC or VBATT to OUT, with on-resistances of 1.2Ω (VCC→OUT) and 12Ω (VBATT→OUT) at rated loads.
Unlike the MAX801, the MAX808LCPA+ excludes watchdog functionality but integrates a 3ns CE gate propagation delay and write-cycle-completion logic that holds CE OUT enabled for 18µs after VCC falls below VRST - ensuring full RAM write completion during power failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.675V ±1.5% - ensures deterministic µP reset before system voltage violates 5V TTL/CMOS logic margins. |
| Reset Timeout | 200ms - guarantees sufficient time for µP initialization and peripheral stabilization after power-up. |
| VCC to OUT On-Resistance | 1.2Ω max - limits voltage drop to ≤220mV at 250mA load, preserving RAM supply integrity. |
| Battery Backup Current | 1µA max - enables multi-year data retention in SRAM during extended main-power outages. |
| CE Propagation Delay | 3ns - supports high-speed µPs (e.g., 80C188, SH-3) without timing violation in normal operation. |
| LOWLINE Threshold | 4.73V (VCC rising) - triggers NMI 52mV above reset point, allowing ≥18µs shutdown window before reset. |
| Supply Current (Normal) | 48µA - minimizes quiescent drain on primary +5V rail in always-on monitoring applications. |
Pinout & Package
MAX808LCPA+ is housed in an 8-pin plastic DIP (PDIP) 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 the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | +5V main supply input | Bypassed with 0.1µF capacitor; powers all internal circuitry except battery path. |
| 2: LOWLINE | Active-low low-voltage warning output | Drives µP NMI pin when VCC drops to 4.73V; enables orderly software shutdown. |
| 3: RESET | Active-low reset output | Guaranteed valid down to VCC = 1V; strong pull-down/weak pull-up allows wire-OR with other reset sources. |
| 4: GND | Signal and power ground reference | 0V reference for all comparators, outputs, and internal biasing networks. |
| 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 gating logic on falling VCC. |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V battery; switches RAM supply when VCC < VRST and VCC < VBATT. |
| 8: OUT | Output supply to RAM and peripherals | Delivers power from VCC (250mA) or BATT (20mA); bypassed with 0.1µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Eliminates need for external trimming resistors; maintains µP operation within safe 4.675V–5.5V window. |
| 18µs write-cycle completion | Prevents partial RAM writes during brownout by holding CE OUT active until µP completes instruction. |
| MaxCap™/SuperCap™ compatibility | Supports large-capacitor backup (e.g., 0.47F) with no external charging circuitry or voltage clamping. |
| RESET valid to VCC = 1V | Ensures reset assertion remains functional even during deep brownout or slow power ramp-down. |
| Low-line comparator with 52mV hysteresis | Provides deterministic NMI timing margin between warning and reset, enabling robust shutdown sequencing. |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-powered handheld ECG monitor operating on Li-ion with 24-hour runtime and nonvolatile memory retention during battery swaps. IC Role / Device Role / Timing Role: MAX808LCPA+ monitors VCC, asserts LOWLINE at 4.73V to trigger firmware save-to-flash, then asserts RESET at 4.675V if voltage continues falling. Use Value: Prevents data corruption during hot-swap by guaranteeing RAM write completion (18µs CE hold) and maintaining valid RESET down to 1V. |
Use Scenario: DIN-rail mounted programmable logic controller with dual-supply redundancy and SRAM-based configuration storage. IC Role / Device Role / Timing Role: MAX808LCPA+ gates CE signals to SRAM during mains failure, switching OUT from 5V rail to backup supercap (0.47F) at 4.675V threshold. Use Value: Enables >10-second graceful shutdown via LOWLINE NMI while maintaining memory integrity via battery-switchover and write-cycle completion. |
| Embedded Point-of-Sale Terminals | Avionics Data Recorders |
|
Use Scenario: Credit card terminal powered by AC adapter with coin-cell backup, requiring tamper-proof transaction logging. IC Role / Device Role / Timing Role: MAX808LCPA+ controls power routing to FRAM via OUT pin and blocks spurious CE toggles during AC dropout using CE IN/OUT gating. Use Value: Eliminates need for external MOSFETs or discrete logic; 1.2Ω VCC→OUT resistance ensures <220mV drop at 250mA peak current. |
Use Scenario: Crash-survivable flight data recorder with MIL-STD-704 compliant power inputs and 10-year SRAM retention requirement. IC Role / Device Role / Timing Role: MAX808LCPA+ provides reset supervision across -40°C to +85°C range, using LOWLINE to initiate secure erase before power loss. Use Value: ±1.5% threshold stability over temperature prevents false resets during thermal cycling; 1µA battery standby extends coin-cell life beyond 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809LPA+ | Single-output (RESET only), no LOWLINE, no CE gating, no battery switchover - simpler 3-pin SOT23 variant. | Lacks RAM write protection and early warning capability; suitable only for basic reset-only systems. | Select MAX809LPA+ only when CE gating, LOWLINE NMI, and battery backup are unnecessary. |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, no battery switchover or CE gating - TI's low-quiescent-current supervisor. | Designed for 3.3V systems; incompatible with +5V VCC operation and RAM backup requirements. | Choose TPS3808G33DBVR only for new 3.3V designs where battery backup and write-cycle completion are not required. |
Compared with MAX809LPA+ and TPS3808G33DBVR, the MAX808LCPA+ uniquely combines 5V-compatible reset supervision, low-line warning, battery-backed RAM power routing, and hardware-enforced write-cycle completion - making it irreplaceable in legacy +5V portable and industrial µP systems requiring memory integrity during power failure.
Availability
MAX808LCPA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, embedded point-of-sale terminals, and avionics data recorders requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX808LCPA+ 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 in industrial, automotive, and communications markets.
The MAX808LCPA+ belongs to Maxim's µP supervisory product line, engineered specifically for +5V microprocessor systems needing deterministic reset, battery-backed memory retention, and hardware-level write-cycle protection during brownout events.
FAQ
What is the exact reset threshold voltage of the MAX808LCPA+?
The MAX808LCPA+ has a nominal reset threshold of 4.675V with ±1.5% accuracy over temperature and supply variations. This value is factory-trimmed and specified in the Electrical Characteristics table under VRST (Reset Threshold) for the 'L' suffix variant. The threshold remains stable across the -40°C to +85°C operating range, with typical drift of less than 10mV over temperature.
Does the MAX808LCPA+ include a watchdog timer function?
No, the MAX808LCPA+ does not include a watchdog timer. That feature is exclusive to the MAX801 family (e.g., MAX801LCPA+). The MAX808LCPA+ focuses on reset supervision, low-line warning, 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 MAX808LCPA+ handle RAM write-cycle completion during power failure?
The MAX808LCPA+ monitors VCC and, upon detecting a fall below the 4.675V reset threshold, holds CE OUT active for exactly 18µs regardless of CE IN state. This ensures the µP completes any ongoing RAM write instruction before CE is disabled. If the write finishes early, CE OUT goes high immediately upon CE IN rising; otherwise, it releases after 18µs - a hardware-gated behavior confirmed in the Chip-Enable Timing diagram (Figure 6).
Can the MAX808LCPA+ operate with a supercapacitor instead of a battery at the BATT pin?
Yes, the MAX808LCPA+ is explicitly MaxCap™/SuperCap™ compatible. Its battery switchover threshold exhibits hysteresis (VBATT + 0.05V on rising VCC), enabling direct connection of a 0.47F supercapacitor with simple charging circuitry. The device tolerates VBATT up to 4.5V and draws only 1µA in backup mode - making it ideal for maintenance-free, long-life backup solutions without electrolytic batteries.
What is the maximum load current supported by the OUT pin of the MAX808LCPA+?
The MAX808LCPA+ supports 250mA from VCC to OUT in normal operating mode, with a typical VCC-to-OUT voltage drop of 220mV at that load (due to 1.2Ω on-resistance). In battery-backup mode, it delivers up to 20mA from BATT to OUT, with a 12Ω on-resistance resulting in ~240mV drop at 20mA. Exceeding these currents risks thermal shutdown or permanent damage, as the device lacks short-circuit protection.
MAX808LCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.675V
- 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
MAX808LCPA+ FAQ
1.How can I place an order for MAX808LCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808LCPA+ 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 MAX808LCPA+ reliable?
The price and inventory of MAX808LCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808LCPA+ is usually 5 days.
3.What payment methods are accepted for MAX808LCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808LCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808LCPA+?
MAX808LCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808LCPA+ 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 MAX808LCPA+?
For technical support, including MAX808LCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808LCPA+ requirements.
6.How does Aetrix verify that MAX808LCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX808LCPA+ 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 MAX808LCPA+ meets industry standards.
7.What is the process for return or replacement of MAX808LCPA+?
All MAX808LCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX808LCPA+, 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 MAX808LCPA+ part is unused and in its original packaging.
Return procedure for MAX808LCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX808LCPA+ Tags
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MIC826SYMT-TR
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