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Analog Devices Inc./Maxim Integrated MAX808LESA+
- Part No.:
- MAX808LESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX808LESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX808LESA+ from Maxim Integrated is an 8-pin SO-package microprocessor supervisory circuit designed for +5V systems, providing precision reset generation (±1.5% accuracy), battery switchover (250mA VCC / 20mA BATT 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 - critical for portable, embedded, and battery-backed memory systems.
For engineers reviewing the MAX808LESA+ datasheet, MAX808LESA+ pinout, MAX808LESA+ application, or MAX808LESA+ equivalent, this device serves as a precision voltage monitor and power-fail coordinator with integrated CE gating, low-line warning (LOWLINE), and battery-backup control - key for reliable µP startup, orderly shutdown, and RAM data retention in brownout conditions.
Technical Context
The MAX808LESA+ integrates three independent comparators: a reset comparator (4.675V threshold, ±1.5% tolerance), a low-line comparator (52mV above reset threshold), and a battery-switchover comparator. Its BiCMOS process enables tight voltage reference stability and ultra-low 48µA supply current in normal operation.
It implements active CMOS RAM protection via a transmission-gate-based CE path with 3ns typical propagation delay and 18µs write-cycle completion hold time. Unlike the MAX801, it omits the watchdog timer but adds dedicated CE IN/CE OUT pins and internal gating logic to prevent write corruption during power failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.675V ±1.5% - ensures deterministic µP reset before system instability at nominal +5V supply |
| Reset Timeout | 200ms minimum - guarantees sufficient time for µP initialization and state recovery after power-up |
| VCC to LOWLINE Delay | 17µs - provides early NMI warning before reset assertion, enabling software-controlled shutdown |
| CE Propagation Delay | 3ns typical - supports high-speed µP interfaces without timing violation on chip-enable signals |
| Supply Current (Normal) | 48µA typical - minimizes quiescent power draw in always-on supervisory applications |
| Battery Backup Current | <1µA - preserves backup battery life during extended power-loss events |
| RESET Validity Range | VCC ≥ 1V - maintains functional reset signaling even during deep brownout or partial power collapse |
Pinout & Package
MAX808LESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (+ suffix). Pin functions are electrically isolated per internal BiCMOS architecture and validated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Primary +5V supply input | Bypassed with 0.1µF capacitor; powers all internal circuits except battery path |
| 2: LOWLINE | Active-low CMOS low-voltage warning output | Asserts 52mV above reset threshold to trigger NMI for controlled shutdown |
| 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 biasing |
| 5: CE OUT | Chip-enable output to RAM | Driven high (to higher of VCC/VBATT) when disabled; passes CE IN when enabled |
| 6: CE IN | Chip-enable input from µP | High-impedance during reset; enables write-cycle completion hold (18µs) on falling VCC |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; sources up to 20mA to OUT during switchover; bypassed with 0.1µF |
| 8: OUT | Output supply to RAM and peripherals | Switches between VCC and VBATT; 12Ω PMOS on-resistance in battery mode |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | ±1.5% threshold accuracy over –40°C to +85°C ensures robust reset timing across environments |
| Write-cycle completion hold | 18µs CE gate extension prevents partial RAM writes during brownout-induced power collapse |
| Low-line warning with hysteresis | 52mV offset + 13mV hysteresis enables reliable early-warning NMI without chatter near threshold |
| MaxCap™/SuperCap™ compatibility | VBATT switchover hysteresis (≈50mV) supports large-capacitor backup sources without external circuitry |
| Ultra-low standby current | 48µA normal mode / <1µA battery-backup mode extends operational lifetime in portable equipment |
Applications
| Portable Medical Monitors | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter requiring RAM data retention during main supply interruption. IC Role / Device Role / Timing Role: MAX808LESA+ monitors VCC, asserts LOWLINE for firmware-initiated save, then switches RAM to BATT via OUT while holding CE until write completes. Use Value: Prevents loss of patient-critical waveform data during brief AC dropout or battery swap, meeting IEC 60601-1 reliability requirements. |
Use Scenario: DIN-rail mounted controller operating in factory environments with noisy 24VDC supplies stepped to +5V. IC Role / Device Role / Timing Role: MAX808LESA+ detects brownout on +5V rail, triggers PLC firmware shutdown sequence via LOWLINE, and isolates RAM using CE gating before VCC drops below 4.675V. Use Value: Eliminates spurious reboots and memory corruption during line sags, ensuring deterministic state recovery after power restoration. |
| Smart Energy Meters | Embedded Point-of-Sale Terminals |
Use Scenario: Electricity meter with tamper-detection logging that must retain timestamped event records during mains failure. IC Role / Device Role / Timing Role: MAX808LESA+ uses BATT switchover and CE hold to guarantee atomic write of last kWh reading to nonvolatile FRAM before power loss. Use Value: Meets ANSI C12.1 and IEC 62053-21 accuracy mandates by preserving billing integrity across >100,000 power cycles. |
Use Scenario: Retail terminal with flash-based OS and SRAM cache, powered by AC adapter with optional Li-ion backup. IC Role / Device Role / Timing Role: MAX808LESA+ asserts RESET only after VCC stabilizes above 4.675V, while LOWLINE warns firmware to flush transaction buffers before final shutdown. Use Value: Avoids corrupted sales logs or incomplete payment authorizations during unexpected AC disconnect or surge events. |
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-output (RESET only), no LOWLINE, no CE gating, 4.63V threshold, SOT23-3 package | Lacks low-line warning and RAM protection - suitable only for basic reset-only use cases | Select when board space is constrained and only reset functionality is required; not drop-in compatible due to pin count and feature set |
| TPS3808G33DBVR | Adjustable reset threshold (via external resistor), 3.3V fixed option, no battery switchover or CE gating, 200ms timeout | Designed for 3.3V systems; no BATT/OUT/CE functionality - requires external circuitry for backup RAM support | Choose for modern low-voltage designs where battery backup is handled separately; different pinout and voltage domain |
Compared with MAX808LESA+, MAX809SEUR+T reduces footprint but sacrifices low-line warning and RAM write protection, while TPS3808G33DBVR supports 3.3V domains but requires external components to replicate MAX808LESA+'s integrated battery switchover and CE gating - making MAX808LESA+ uniquely suited for +5V battery-backed µP systems needing coordinated power-fail response.
Availability
MAX808LESA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial controllers, smart energy meters, and embedded point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX808LESA+ 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 family was engineered specifically for +5V microprocessor systems needing precision reset, battery-backed RAM protection, and deterministic power-fail coordination - targeting reliability-critical embedded applications where data integrity during brownout is non-negotiable.
FAQ
What is the reset threshold voltage of the MAX808LESA+?
The MAX808LESA+ has a factory-trimmed reset threshold of 4.675V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed by the "L" suffix and verified per Maxim's production test flow. The threshold remains stable across load and supply variations, ensuring consistent µP reset behavior in +5V systems. MAX808LESA+ does not support adjustable thresholds.
Does the MAX808LESA+ include a watchdog timer?
No, the MAX808LESA+ does not include a watchdog timer. That function is exclusive to the MAX801 series (e.g., MAX801LESA+). The MAX808LESA+ focuses on voltage monitoring, battery switchover, and chip-enable gating for RAM protection. Its functional block diagram confirms absence of WDI pin and watchdog oscillator circuitry - confirmed in the "Detailed Description" and "Pin Description" sections of the official datasheet.
How does the MAX808LESA+ protect CMOS RAM during power failure?
The MAX808LESA+ protects CMOS RAM using dual mechanisms: first, it asserts LOWLINE 52mV above the 4.675V reset threshold to trigger firmware-initiated save routines; second, it gates the CE signal - holding CE OUT active for 18µs after VCC falls below threshold to complete ongoing RAM writes. This CE hold is hardware-enforced and independent of firmware, preventing partial writes and data corruption during brownout.
What is the maximum output current capability of the MAX808LESA+ OUT pin?
In VCC-powered mode, the MAX808LESA+ OUT pin delivers up to 250mA with a typical VOUT drop of 220mV at full load. In battery-backup mode (VCC = 0V), it sources up to 20mA with ~12Ω on-resistance. These ratings are specified in the "Electrical Characteristics" table under "VCC to OUT On-Resistance" and "BATT to OUT On-Resistance", and validated across temperature per the Typical Operating Characteristics graphs.
Can the MAX808LESA+ be used with SuperCap™ or MaxCap™ backup sources?
Yes, the MAX808LESA+ is explicitly designed for SuperCap™ and MaxCap™ compatibility. Its battery switchover comparator includes ≈50mV hysteresis (VBATT vs. VCC), enabling clean transition with large-value capacitors (e.g., 0.47F) without oscillation. Figure 8 in the datasheet shows a validated SuperCap charging circuit using a 1N4148 diode and +5V source - confirming direct applicability without additional regulation or control logic.
MAX808LESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX808LESA+ FAQ
1.How can I place an order for MAX808LESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808LESA+ 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+ reliable?
The price and inventory of MAX808LESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808LESA+ is usually 5 days.
3.What payment methods are accepted for MAX808LESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808LESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808LESA+?
MAX808LESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808LESA+ 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+?
For technical support, including MAX808LESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808LESA+ requirements.
6.How does Aetrix verify that MAX808LESA+ is sourced from the original manufacturer or authorized distributors?
All MAX808LESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX808LESA+?
All MAX808LESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX808LESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX808LESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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