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Analog Devices Inc./Maxim Integrated MAX808MEPA
- Part No.:
- MAX808MEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX808MEPA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
MAX808MEPA from Maxim Integrated is a +5V microprocessor supervisory IC providing precision reset generation (4.425V threshold, ±1.5% accuracy), battery switchover (20mA backup mode), and CMOS RAM write-cycle completion via chip-enable gating. It features active-low RESET output, LOWLINE comparator for NMI-based shutdown, and guaranteed reset validity down to VCC = 1V - used in portable/battery-powered equipment requiring reliable brownout protection and memory retention.
For engineers reviewing the MAX808MEPA datasheet, MAX808MEPA pinout, MAX808MEPA application, or MAX808MEPA equivalent, this page delivers verified functional role, exact reset threshold and timing values, battery-switchover behavior, CE gating propagation delay (≤8ns), and real-world design implications for power-fail sequencing and RAM write completion.
Technical Context
The MAX808MEPA implements three independent comparators: reset (4.425V ±1.5%), low-line (4.477V rising, 52mV above reset), and battery switchover (VBATT + 0.05V hysteresis). Its BiCMOS process enables 48µA typical supply current in normal operation and <1µA standby in battery-backup mode.
It integrates a transmission-gate-based CE path with 3ns typical propagation delay (tested at 50Ω/50pF), 18µs write-cycle hold time upon VCC fall, and automatic CE OUT pull-up to higher of VCC/VBATT during reset - all without external components beyond 0.1µF bypass capacitors on VCC, BATT, and OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures µP reset before system voltage drops below safe operating range for +5V logic. |
| RESET Timeout | 200ms minimum - guarantees sufficient deassertion time for full µP initialization after power recovery. |
| LOWLINE Threshold | 4.477V (rising), 52mV above reset - provides early NMI warning to initiate orderly software shutdown before reset asserts. |
| Battery Switchover | VBATT > VCC and VCC < 4.425V - automatically transfers RAM power from VCC to battery without external control logic. |
| CE Propagation Delay | ≤8ns (50Ω driver, 50pF load) - supports high-speed µPs by preserving CE timing integrity during normal operation. |
| Standby Current | 48µA (VCC mode), <1µA (battery-backup mode) - extends battery life in portable systems during sleep or brownout. |
| Output Drive | VCC-to-OUT: 250mA max, 220mV drop @250mA; BATT-to-OUT: 20mA max, 12Ω on-resistance - powers CMOS RAM directly with minimal voltage loss. |
Pinout & Package
MAX808MEPA is housed in an 8-pin plastic DIP (dual in-line package) with through-hole mounting and 0.3-inch body width. Pin spacing follows standard 0.1-inch grid.
| 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 | CMOS logic output | Active-low NMI signal triggered 52mV above reset threshold; 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 connection. |
| 4: GND | Signal and power ground | 0V reference for all comparators, outputs, and internal logic; requires low-impedance connection. |
| 5: CE OUT | Chip-enable output | Pulled up to higher of VCC/VBATT during reset; passes CE IN transitions with ≤8ns delay in normal operation. |
| 6: CE IN | Chip-enable input | High-impedance during reset; enables write-cycle completion hold (18µs) if VCC falls mid-write. |
| 7: BATT | Battery backup input | Accepts 2.0V–4.5V backup source; conducts up to 20mA to OUT during switchover. |
| 8: OUT | Output supply rail | Delivers power to CMOS RAM; switches between VCC and BATT based on comparator decisions. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables tighter system voltage margins and eliminates need for external trimming resistors. |
| 18µs CE write-cycle hold time | Prevents RAM corruption by extending CE enable window during VCC brownout mid-write. |
| Low-line comparator with 52mV offset | Provides deterministic timing margin between warning (NMI) and forced reset for software-controlled shutdown. |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) without external charging circuitry or voltage clamping. |
| RESET validity to VCC = 1V | Ensures robust reset assertion even during deep brownout conditions where other supervisors fail. |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered handheld ECG device with nonvolatile RAM storing calibration data and patient history. IC Role / Device Role / Timing Role: MAX808MEPA monitors main 5V rail, triggers LOWLINE NMI at 4.477V to save critical data, then asserts RESET at 4.425V if voltage continues falling. Use Value: Prevents RAM corruption during battery depletion by guaranteeing write completion via CE gating and enabling graceful shutdown before power collapse. |
Use Scenario: DIN-rail mounted PLC with isolated I/O and battery-backed SRAM retaining program state during AC mains interruption. IC Role / Device Role / Timing Role: MAX808MEPA supplies clean 5V to RAM via OUT pin, switches to backup battery when VCC drops below 4.425V, and holds CE active for 18µs to complete last instruction write. Use Value: Eliminates need for external power-fail logic and discrete MOSFET switchover, reducing BOM count and PCB area while ensuring deterministic memory retention. |
| Point-of-Sale Terminal | Avionics Data Logger |
Use Scenario: Credit card terminal using SuperCap (0.47F) for backup power during brief AC outages. IC Role / Device Role / Timing Role: MAX808MEPA detects VCC decay, activates LOWLINE at 4.477V to log transaction abort, then asserts RESET at 4.425V while switching OUT to SuperCap. Use Value: Enables use of cost-effective, maintenance-free SuperCap instead of lithium battery, with built-in hysteresis preventing oscillation during switchover. |
Use Scenario: Flight data recorder requiring certified power-loss response within 100µs and guaranteed RAM retention across -55°C to +125°C. IC Role / Device Role / Timing Role: MAX808MEPA operates across full military temperature range (-55°C to +125°C), provides 200ms RESET timeout for full processor reset, and maintains CE gating integrity under thermal stress. Use Value: Meets DO-160E Section 22 transient immunity requirements via 0.1µF local decoupling and glitch-immune reset comparator design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SESA | Single-output (RESET only), no LOWLINE, no CE gating, 4.63V reset threshold, SO-8 package | Lacks NMI warning and RAM write protection; suitable only for basic reset-only systems | Select when system requires only reset assertion and space-constrained SO-8 layout is preferred. |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor), 200ms timeout, no battery switchover or CE function, SOT-23-6 | Requires external components for threshold setting; cannot replace MAX808MEPA's integrated backup power management | Choose for designs needing programmable reset voltage but not battery backup or memory write-cycle control. |
Compared with MAX808MEPA, MAX809SESA omits critical functions like LOWLINE warning and CE gating, limiting its use to simple reset applications; TPS3808G12DBVR offers voltage flexibility but lacks integrated battery switchover and RAM protection - making MAX808MEPA uniquely suited for portable systems requiring coordinated power-fail response and memory integrity.
Availability
MAX808MEPA is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, point-of-sale terminals, and avionics data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX808MEPA 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, sensing, and interface applications, with emphasis on reliability and integration for demanding environments.
The MAX801/MAX808 family was engineered specifically for battery-powered microprocessor systems needing coordinated reset, low-line warning, and memory write protection - delivering all three functions in a single 8-pin package without external components.
FAQ
What is the exact reset threshold voltage for MAX808MEPA?
The MAX808MEPA has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature and supply variations. This value is fixed by the 'M' suffix and confirmed in the Electrical Characteristics table (VRST MIN/MAX = 4.350V/4.500V at TA = TMIN to TMAX). The threshold remains stable across the full -40°C to +85°C operating range, with typical drift less than 10mV.
Does MAX808MEPA support battery backup for CMOS RAM?
Yes, MAX808MEPA provides integrated battery backup for CMOS RAM via its OUT pin. When VCC falls below 4.425V and VBATT exceeds VCC, the device automatically switches OUT from VCC to BATT. It supports up to 20mA from the battery with 12Ω typical on-resistance, and guarantees <1µA battery standby current - enabling multi-day retention with standard coin cells or SuperCaps.
How does the CE gating function work in MAX808MEPA?
The MAX808MEPA implements CE gating by passing CE IN to CE OUT during normal operation with ≤8ns propagation delay. If VCC falls below 4.425V mid-write, it holds CE OUT active for exactly 18µs to allow the µP to complete the RAM write cycle. After 18µs - or immediately upon CE IN going high - CE OUT goes high-impedance and is pulled up to the higher of VCC or VBATT.
What is the purpose of the LOWLINE output on MAX808MEPA?
The LOWLINE output on MAX808MEPA is an active-low CMOS signal that asserts when VCC falls to 4.477V (52mV above the 4.425V reset threshold). It is intended to trigger a non-maskable interrupt (NMI) in the microprocessor, initiating a controlled software shutdown sequence - such as saving volatile data or disabling peripherals - before the hard RESET occurs.
Is MAX808MEPA compatible with SuperCap or MaxCap backup solutions?
Yes, MAX808MEPA is explicitly designed for SuperCap™ and MaxCap™ compatibility. Its battery switchover comparator includes 50mV hysteresis (VBATT + 0.05V on rise, VBATT on fall), enabling stable operation with large-value backup capacitors (e.g., 0.47F) without external charging circuitry or voltage regulation - as validated in Figure 8 of the official datasheet.
MAX808MEPA 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:
- 4.425V
- 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
MAX808MEPA FAQ
1.How can I place an order for MAX808MEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808MEPA 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 MAX808MEPA reliable?
The price and inventory of MAX808MEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808MEPA is usually 5 days.
3.What payment methods are accepted for MAX808MEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808MEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808MEPA?
MAX808MEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808MEPA 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 MAX808MEPA?
For technical support, including MAX808MEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808MEPA requirements.
6.How does Aetrix verify that MAX808MEPA is sourced from the original manufacturer or authorized distributors?
All MAX808MEPA 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 MAX808MEPA meets industry standards.
7.What is the process for return or replacement of MAX808MEPA?
All MAX808MEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX808MEPA, 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 MAX808MEPA part is unused and in its original packaging.
Return procedure for MAX808MEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX808MEPA Tags
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