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Analog Devices Inc./Maxim Integrated MAX808LESA+T
- Part No.:
- MAX808LESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808LESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,665
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Product details
Overview
MAX808LESA+T from Maxim Integrated is an 8-pin microprocessor supervisory circuit designed for +5V systems, providing precision reset generation (±1.5% accuracy), battery-backed power switchover (20mA backup 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 requiring reliable brownout recovery and orderly shutdown.
For engineers reviewing the MAX808LESA+T datasheet, MAX808LESA+T pinout, MAX808LESA+T application, or MAX808LESA+T equivalent, key selection criteria include reset threshold tolerance, battery-switchover hysteresis (50mV), CE propagation delay (≤8ns), low-line comparator offset (+52mV above reset), and SO-8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The MAX808LESA+T integrates three independent comparators: reset (4.675V ±1.5%), low-line (+52mV above reset), and battery switchover (VBATT vs. VCC). Its BiCMOS process enables 48µA typical supply current in normal operation and <1µA standby in battery-backup mode.
It implements a dedicated chip-enable transmission gate (75Ω RON, 3ns min / 8ns max propagation) with write-cycle completion logic that holds CE OUT enabled for 18µs during VCC fall-through, ensuring RAM write integrity before power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.675V ±1.5% - ensures deterministic µP reset before system-level voltage violation. |
| Reset Timeout | 200ms - guarantees sufficient time for µP initialization after power-up or brownout recovery. |
| Battery Switchover | VCC < VBATT and VCC < 4.675V - automatic RAM power source transition without external control. |
| CE Propagation Delay | 3ns (min) to 8ns (max) - supports high-speed µP address/data timing with minimal latency impact. |
| Low-Line Threshold | 4.727V (4.675V + 52mV) - triggers NMI for software-initiated shutdown before reset assertion. |
| Supply Current | 48µA (normal), <1µA (battery-backup) - extends battery life in portable/embedded applications. |
| Output Drive | VCC-to-OUT: 250mA @ ≤220mV drop; BATT-to-OUT: 20mA @ ≤12Ω RON - sustains RAM retention under main power loss. |
Pinout & Package
MAX808LESA+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 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Main +5V supply input | Bypassed with 0.1µF capacitor; powers internal circuitry and drives OUT when active. |
| 2: LOWLINE | Active-low CMOS NMI output | Asserts at 4.727V (52mV above reset); initiates controlled shutdown before reset. |
| 3: RESET | Active-low reset output | Guaranteed valid down to VCC = 1V; strong pull-down/weak pull-up enables 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 to higher of VCC/VBATT when disabled; gated during reset to prevent write corruption. |
| 6: CE IN | Chip-enable input from µP | High-impedance during reset; enables write-cycle completion logic on VCC fall. |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; sources up to 20mA to OUT in backup mode. |
| 8: OUT | RAM power output | Switches between VCC and BATT; bypassed with 0.1µF capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables tighter system voltage margining and eliminates need for external trimming. |
| 18µs write-cycle completion hold | Ensures CMOS RAM write completion during VCC brownout, preventing data corruption. |
| 52mV low-line hysteresis offset | Provides deterministic warning window between low-line assertion and reset activation. |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) without external charging circuitry. |
| RESET validity to VCC = 1V | Maintains functional reset signaling even during deep brownout, critical for low-VCC µPs. |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered handheld ECG device operating on single Li-ion cell with buck-boost regulation to 5V. IC Role / Device Role / Timing Role: Supervises 5V rail, asserts LOWLINE at 4.727V to trigger firmware save-to-flash, then RESET at 4.675V if recovery fails. Use Value: Prevents data loss during battery depletion by enabling 100ms+ graceful shutdown before RAM power collapse. |
Use Scenario: DIN-rail mounted programmable logic controller with nonvolatile RAM and watchdog-critical firmware. IC Role / Device Role / Timing Role: Provides reset supervision, battery-backed RAM retention, and CE gating to block spurious writes during AC line sag. Use Value: Eliminates need for external CE logic and discrete battery switchover MOSFETs, reducing BOM count by 4 components. |
| Smart Energy Meter | Avionics Data Logger |
Use Scenario: ANSI C12.20-certified meter with supercapacitor backup and tamper-detection EEPROM writes. IC Role / Device Role / Timing Role: Monitors 5V DC-DC output; uses CE gating to freeze memory access during transient dips below 4.675V. Use Value: Guarantees EEPROM write integrity during 200ms grid interruption events per IEC 61000-4-11. |
Use Scenario: DO-160G Class D flight recorder with dual 5V supplies (main + hot battery bus) and crash-survivable RAM. IC Role / Device Role / Timing Role: Switches RAM power from main to hot battery within 1µs of VCC dropout; asserts RESET only after 200ms confirmation. Use Value: Meets RTCA DO-254 safety requirement for deterministic power-fail response without false resets from EMI transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Single-reset-output variant (no LOWLINE, no CE gating); 4.63V threshold; SOT23-3 package. | Lacks low-line warning and RAM write protection; suitable only for basic reset-only use cases. | Select only if space-constrained design requires SOT23 and does not require NMI or CE control. |
| TPS3808G18DBVR | TI part with 1.8V fixed threshold; adjustable delay; no battery switchover or CE gating; 6-pin SOT23. | Designed for low-voltage µPs (1.8V–5.5V); incompatible with +5V-only systems needing battery backup. | Use only in new designs targeting 1.8V–3.3V domains; not a functional substitute for MAX808LESA+T's 5V supervision features. |
Compared with MAX809SEUR+T and TPS3808G18DBVR, MAX808LESA+T uniquely combines 5V-specific precision reset, low-line NMI, battery-backed RAM power switchover, and hardware-enforced CE gating - making it irreplaceable in legacy +5V embedded systems requiring full power-fail resilience.
Availability
MAX808LESA+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and avionics data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX808LESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX801/MAX808 product line was engineered specifically for robust +5V microprocessor supervision in battery-critical systems - delivering precision reset, low-line warning, and hardware-protected RAM backup in a single 8-pin SO package.
FAQ
What is the exact reset threshold voltage of the MAX808LESA+T?
The MAX808LESA+T has a nominal reset threshold of 4.675V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table of the official datasheet. The 'L' suffix explicitly denotes this 4.675V variant, distinguishing it from the 'N' (4.575V) and 'M' (4.425V) versions. MAX808LESA+T maintains this specification under VCC = 4.6V to 5.5V operation.
Does the MAX808LESA+T provide both RESET and RESET outputs?
No, the MAX808LESA+T provides only the active-low RESET output (pin 3). The complementary active-high RESET output is exclusive to the MAX801 family. MAX808LESA+T is functionally differentiated by its integrated chip-enable (CE) gating circuitry - including CE IN (pin 6) and CE OUT (pin 5) - which prevents RAM write corruption during power failure. This makes MAX808LESA+T the correct choice for systems requiring hardware-enforced write-cycle completion.
How does the low-line comparator in the MAX808LESA+T differ from the reset comparator?
The low-line comparator in MAX808LESA+T asserts LOWLINE (pin 2) at VCC = 4.727V - exactly 52mV above the 4.675V reset threshold - with 13mV hysteresis. This creates a deterministic warning window before RESET activation, enabling firmware to execute an orderly shutdown. Unlike the reset comparator, LOWLINE has no timeout; it responds immediately to VCC crossing its threshold and is intended solely for generating a non-maskable interrupt (NMI) to the microprocessor.
Can the MAX808LESA+T be used with supercapacitors for battery backup?
Yes, MAX808LESA+T is explicitly MaxCap™/SuperCap™ compatible per its datasheet. Its battery switchover comparator includes built-in hysteresis (50mV) and accepts VBATT up to 4.5V, enabling direct interface with 0.47F supercapacitors charged via simple resistor-diode circuits (e.g., Figure 8 in the datasheet). The device guarantees <1µA battery leakage in backup mode, maximizing hold-up time - a key requirement for supercap-based backup solutions in MAX808LESA+T designs.
What is the maximum load current supported by the OUT pin of the MAX808LESA+T?
The OUT pin of MAX808LESA+T supports up to 250mA when powered from VCC (with ≤220mV drop at full load) and up to 20mA when powered from the BATT pin (with ~12Ω on-resistance). These values are specified in the Electrical Characteristics table under "VCC to OUT On-Resistance" and "BATT to OUT On-Resistance". Exceeding 20mA from battery risks violating the 12Ω RON spec and may cause excessive voltage droop on OUT during backup operation.
MAX808LESA+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:
- 4.675V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX808LESA+T FAQ
1.How can I place an order for MAX808LESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808LESA+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 MAX808LESA+T reliable?
The price and inventory of MAX808LESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808LESA+T is usually 5 days.
3.What payment methods are accepted for MAX808LESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808LESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808LESA+T?
MAX808LESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808LESA+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 MAX808LESA+T?
For technical support, including MAX808LESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808LESA+T requirements.
6.How does Aetrix verify that MAX808LESA+T is sourced from the original manufacturer or authorized distributors?
All MAX808LESA+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 MAX808LESA+T meets industry standards.
7.What is the process for return or replacement of MAX808LESA+T?
All MAX808LESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX808LESA+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 MAX808LESA+T part is unused and in its original packaging.
Return procedure for MAX808LESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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