My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX808LEPA
- Part No.:
- MAX808LEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX808LEPA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:297
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX808LEPA from Maxim Integrated is an 8-pin +5V microprocessor supervisory IC providing precision reset generation, battery switchover, low-line warning (NMI), and CMOS RAM write-cycle completion gating. It features ±1.5% reset threshold accuracy (4.675V), 200ms reset timeout, 1µA standby current, and operates over –40°C to +85°C in plastic DIP package. It is used in portable/battery-powered equipment requiring reliable power-fail response and RAM data integrity.
For engineers reviewing the MAX808LEPA datasheet, MAX808LEPA pinout, MAX808LEPA application, or MAX808LEPA equivalent, this page delivers verified functional identity, exact reset threshold and timing behavior, battery-switchover hysteresis, CE gating propagation delay, and validated alternative options for industrial embedded and critical µP power monitoring designs.
Technical Context
The MAX808LEPA integrates a precision voltage comparator with 4.675V reset threshold (±1.5%), a low-line comparator set 52mV above reset, and a battery switchover circuit that activates when VCC falls below both VRST and VBATT. Its OUT pin delivers up to 250mA from VCC or 20mA from battery, with on-resistance of 1.2Ω (VCC→OUT) and 12Ω (BATT→OUT).
It implements chip-enable (CE) gating with 3ns typical propagation delay, write-cycle completion hold time of 18µs, and automatic CE IN high-impedance disable during reset assertion. RESET is active-low, guaranteed valid down to VCC = 1V, and includes internal timing for 200ms deassertion delay after VCC recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.675V ±1.5% - ensures µP reset before system logic fails at nominal +5V supply |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization after power recovery |
| Low-Line Threshold | 4.727V (4.675V + 52mV) - triggers NMI for orderly shutdown before reset occurs |
| Battery Switchover Threshold | VBATT − 0.05V (rising), VBATT (falling) - enables clean transition to backup power without glitch |
| VCC-to-OUT On-Resistance | 1.2Ω max - limits voltage drop to ≤220mV at 250mA load for stable RAM supply |
| CE Propagation Delay | 3ns typ. - supports high-speed µP address/data timing without CE skew |
| Standby Supply Current | 48µA (VCC mode), <1µA (battery-backup mode) - extends battery life in portable systems |
Pinout & Package
MAX808LEPA 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 with a dot or notch; pins are numbered counter-clockwise from top-left corner.
| 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 NMI when VCC drops to 4.727V; swings rail-to-rail between VCC and GND |
| 3: RESET | Active-low reset output | Guaranteed logic low for VCC ≥1V; remains asserted ≥200ms after VCC rises above 4.675V |
| 4: GND | Ground reference | 0V return path for all analog comparators, digital outputs, and power switches |
| 5: CE OUT | Chip-enable output to RAM | Pulled to higher of VCC/VBATT when disabled; passes CE transitions with 3ns delay during normal operation |
| 6: CE IN | Chip-enable input from µP | High-impedance during reset; enables write-cycle completion hold (18µs) on VCC brownout |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; sources up to 20mA to OUT in battery-backup mode |
| 8: OUT | Output supply to RAM and peripherals | Switches automatically between VCC and BATT; bypassed with 0.1µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables tight margining of +5V systems without external calibration or trimming |
| 200ms programmable reset timeout | Ensures µP completes power-on self-test and register initialization before release |
| On-board CE gating with 18µs write-completion hold | Prevents partial writes to CMOS RAM during brownout by extending CE enable window |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) with no external charge control circuitry |
| RESET validity down to VCC = 1V | Maintains deterministic reset state even during deep brownout or slow power ramp-down |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools require nonvolatile RAM retention and safe shutdown during battery depletion. IC Role / Device Role / Timing Role: MAX808LEPA monitors VCC, asserts LOWLINE at 4.727V to trigger firmware-initiated data save, then asserts RESET at 4.675V if voltage continues falling. Use Value: Prevents data corruption by guaranteeing RAM write completion via 18µs CE hold and enabling graceful shutdown before power loss. |
Use Scenario: Programmable logic controllers in factory automation must retain configuration and I/O state during AC line sags or UPS transitions. IC Role / Device Role / Timing Role: MAX808LEPA supplies uninterrupted power to SRAM via OUT pin, switching seamlessly from VCC to backup battery when mains fail. Use Value: Delivers 20mA from battery with <1µA quiescent draw, preserving backup runtime while maintaining deterministic reset behavior across temperature. |
| Embedded Point-of-Sale Terminals | Avionics Data Recorders |
Use Scenario: Credit card terminals use CMOS RAM for transaction buffers and encryption keys; power interruption during write must be avoided. IC Role / Device Role / Timing Role: MAX808LEPA gates CE signal to RAM and extends enable window by 18µs upon VCC dip, ensuring full write cycle completion. Use Value: Eliminates need for external backup power supervisors or complex firmware retry logic for RAM writes. |
Use Scenario: Flight data recorders require guaranteed memory integrity during rapid power loss events (e.g., engine flameout). IC Role / Device Role / Timing Role: MAX808LEPA's 52mV LOWLINE-to-RESET offset provides ≥100µs warning margin before reset, enabling final data flush to nonvolatile storage. Use Value: Enables deterministic, hardware-triggered shutdown sequence without software latency or watchdog dependency. |
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 | 3-pin SOT23, 4.63V reset threshold, no battery switchover or CE gating | Suitable only for basic reset-only functions; lacks LOWLINE, BATT, CE, and OUT functionality | Select when only reset supervision is needed and board space is constrained |
| TPS3808G18DBVR | 6-pin SOT23, 1.8V reset threshold, adjustable timeout, no battery support or CE logic | Designed for low-voltage µPs; incompatible with +5V systems and RAM backup requirements | Choose for modern 1.8V/3.3V SoC supervision where battery backup is handled externally |
Compared with MAX808LEPA, MAX809SEUR+T omits all battery management and memory protection features, while TPS3808G18DBVR targets lower supply voltages and lacks the integrated CE gating and dual-supply switching essential for legacy +5V RAM-based systems.
Availability
MAX808LEPA 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 MAX808LEPA 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 designed specifically for +5V microprocessor systems needing precision reset, battery-backed RAM retention, and hardware-enforced write-cycle completion-targeting portable, industrial, and mission-critical embedded platforms.
FAQ
What is the exact reset threshold voltage for MAX808LEPA?
The MAX808LEPA has a nominal reset threshold of 4.675V with ±1.5% accuracy over temperature and supply variations. This value is fixed by the 'L' suffix and confirmed in the Electrical Characteristics table under VRST parameter. The threshold remains stable across the –40°C to +85°C operating range, with typical drift less than 10mV over temperature per the RESET THRESHOLD vs. TEMPERATURE graph.
Does MAX808LEPA support SuperCap™ or MaxCap™ backup solutions?
Yes, MAX808LEPA is explicitly MaxCap™/SuperCap™ compatible as stated in its Features list. Its battery switchover hysteresis (VBATT vs. VCC) and wide VBATT input range (2.0V–4.5V) allow direct connection to large-value backup capacitors like 0.47F SuperCaps without external charging circuitry or voltage clamping.
How does the CE gating function work in MAX808LEPA during a power failure?
When VCC falls below the reset threshold, MAX808LEPA holds CE OUT enabled for 18µs to complete the ongoing RAM write cycle. If the µP finishes writing before 18µs, CE OUT goes high immediately; otherwise, it goes high at 18µs. This behavior is implemented in hardware and requires no firmware intervention, ensuring data integrity during brownout.
What is the maximum load current MAX808LEPA can deliver from its OUT pin?
MAX808LEPA delivers up to 250mA from VCC in normal operation (with ≤220mV dropout at full load) and up to 20mA from the BATT pin in backup mode. The BATT-to-OUT on-resistance is 12Ω, limiting voltage drop to ≤240mV at 20mA. Exceeding these currents risks thermal overload or output regulation failure.
Is MAX808LEPA pin-compatible with other members of the MAX801/MAX808 family?
Yes, all MAX801/MAX808 variants-including MAX808LEPA-share identical 8-pin DIP/SO pinouts and functional assignments. The suffix (L/M/N) denotes only reset threshold voltage; electrical behavior, timing, and interface logic remain consistent across the family, enabling drop-in replacement within the same package type.
MAX808LEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.675V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX808LEPA FAQ
1.How can I place an order for MAX808LEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808LEPA 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 MAX808LEPA reliable?
The price and inventory of MAX808LEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808LEPA is usually 5 days.
3.What payment methods are accepted for MAX808LEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808LEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808LEPA?
MAX808LEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808LEPA 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 MAX808LEPA?
For technical support, including MAX808LEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808LEPA requirements.
6.How does Aetrix verify that MAX808LEPA is sourced from the original manufacturer or authorized distributors?
All MAX808LEPA 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 MAX808LEPA meets industry standards.
7.What is the process for return or replacement of MAX808LEPA?
All MAX808LEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX808LEPA, 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 MAX808LEPA part is unused and in its original packaging.
Return procedure for MAX808LEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX808LEPA Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
