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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 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:209
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Product details
Overview
MAX808MEPA+ from Maxim Integrated is an 8-pin +5V microprocessor supervisory circuit with precision reset monitoring, battery switchover, and CMOS RAM write protection. It features ±1.5% reset threshold accuracy (4.425V), 200ms reset timeout, 1µA standby current, and active-low RESET output guaranteed valid down to VCC = 1V. It is used in portable/battery-powered equipment for reliable power-fail detection and orderly shutdown.
For engineers reviewing the MAX808MEPA+ datasheet, MAX808MEPA+ pinout, MAX808MEPA+ application, or MAX808MEPA+ equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior (e.g., 18µs CE write-completion hold), battery-switchover hysteresis (50mV), and validated alternatives for critical µP power monitoring designs.
Technical Context
The MAX808MEPA+ integrates a precision reset comparator with 4.425V threshold (±1.5%), low-line comparator (52mV above reset), and dual-path power switching (VCC→OUT and BATT→OUT). Its internal PMOS switches support 250mA VCC-mode and 20mA battery-backup-mode sourcing, with on-resistance of 1.2Ω (VCC→OUT) and 12Ω (BATT→OUT).
Unlike the MAX801, it omits watchdog functionality but adds chip-enable gating: CE IN to CE OUT propagation delay is 3ns (typ), with 18µs write-cycle completion hold during VCC brownout. CE OUT actively pulls up to the higher of VCC or VBATT when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures deterministic µP reset before system voltage violates minimum operating spec |
| Reset Timeout | 200ms - guarantees sufficient time for µP initialization after power recovery |
| Standby Current | 1µA - enables multi-year battery backup for CMOS RAM without significant drain |
| VCC→OUT On-Resistance | 1.2Ω (typ) - limits dropout to 220mV at 250mA, preserving supply headroom |
| BATT→OUT On-Resistance | 12Ω (typ) - supports 20mA backup load while maintaining >2.5V at RAM under worst-case VBATT = 2.8V |
| Low-Line Threshold | 4.477V (4.425V + 52mV) - triggers NMI 18µs before reset, enabling software-controlled shutdown |
| CE Propagation Delay | 3ns (typ) - transparently passes CE signals during normal operation without µP timing penalty |
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 is 0.1 inch, compatible with standard DIP sockets and PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | +5V main supply input | Bypassed with 0.1µF capacitor; powers all internal circuitry except BATT path |
| 2: LOWLINE | Active-low low-voltage warning output | Asserts 52mV above reset threshold to trigger NMI for controlled shutdown |
| 3: RESET | Active-low reset output | Guaranteed logic low for 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 high to max(VCC, VBATT) when disabled; passes CE IN during normal operation |
| 6: CE IN | Chip-enable input from µP | High-impedance during reset; enables write-cycle completion hold (18µs) |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; switchover occurs when VCC < VRST and VCC < VBATT |
| 8: OUT | Output supply to RAM and peripherals | Switches between VCC and BATT; bypassed with 0.1µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| CMOS RAM write-cycle completion | Holds CE gate enabled for 18µs during VCC brownout to prevent partial writes |
| MaxCap™/SuperCap™ compatibility | Supports large-capacitance backup sources (e.g., 0.47F) with no external circuitry |
| RESET validity to VCC = 1V | Ensures reliable reset assertion even during deep brownout conditions |
| Battery switchover hysteresis | 50mV prevents oscillation during VCC transitions near threshold |
| Low-line comparator propagation delay | 17µs (typ) - provides timely NMI with minimal latency before reset |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools requiring nonvolatile RAM retention during battery swaps. IC Role / Device Role / Timing Role: Supervises VCC, asserts LOWLINE for firmware-initiated data save, then asserts RESET if voltage collapses; manages BATT→OUT switchover to preserve RAM state. Use Value: Enables hot-swap battery replacement without RAM corruption, leveraging 1µA standby current and 18µs CE hold to complete pending writes. |
Use Scenario: Programmable logic controllers in factory automation exposed to noisy 24V DC supplies with frequent brownouts. IC Role / Device Role / Timing Role: Monitors 5V logic rail derived from DC-DC converter; triggers LOWLINE NMI to halt I/O scanning and flush buffers before RESET deasserts. Use Value: Prevents spurious I/O toggling during undervoltage by guaranteeing 200ms reset timeout and 52mV low-line margin, reducing field failures. |
| Embedded Point-of-Sale Terminals | Military Communication Radios |
Use Scenario: Credit card terminals using flash memory and SRAM, powered from AC adapters or internal Li-ion batteries. IC Role / Device Role / Timing Role: Provides VCC supervision and CE gating to protect RAM during adapter disconnect or battery depletion; uses OUT to power RAM directly. Use Value: Eliminates need for external CE logic; 3ns CE propagation preserves µP timing margins, while 12Ω BATT→OUT resistance sustains >2.5V at RAM during backup. |
Use Scenario: Ruggedized HF/VHF radios operating across -40°C to +85°C with wide-input DC-DC converters. IC Role / Device Role / Timing Role: Ensures deterministic reset across temperature (±0.5% VRST drift) and monitors dual-supply paths (main + backup); supports MIL-STD-883 screening via MJA variant. Use Value: Delivers ±1.5% reset accuracy over full industrial range, with RESET valid to 1V ensuring operation during cold-start battery sag. |
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, no battery switchover; 4.63V threshold | Suitable only for basic reset-only systems without RAM backup or NMI requirements | Select when cost and board space are constrained and advanced features are unnecessary |
| TPS3808G12DBVR | Adjustable reset threshold (via resistor divider), no battery switchover, no CE gating, 1.2V fixed threshold option | Designed for low-voltage systems (<3.3V); lacks BATT/OUT architecture and low-line warning | Choose for modern low-VDD µPs where programmability outweighs integrated backup control |
Compared with MAX808MEPA+, MAX809SESA+ reduces feature set to basic reset generation but lowers cost and quiescent current (0.8µA), while TPS3808G12DBVR offers threshold flexibility at the expense of missing battery management and CE protection-making MAX808MEPA+ uniquely suited for legacy +5V µP systems with RAM backup needs.
Availability
MAX808MEPA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, embedded point-of-sale terminals, and military communication radios 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) 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 voltage monitoring, battery-backed RAM protection, and deterministic power-fail response-targeting portable, industrial, and mission-critical embedded platforms.
FAQ
What is the exact reset threshold voltage of the MAX808MEPA+?
The MAX808MEPA+ has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature and supply variations. This value is confirmed in the Electrical Characteristics table under "VRST" for suffix 'M', and is validated across the -40°C to +85°C operating range. The threshold remains stable with less than 0.5% drift over temperature, making it suitable for systems requiring tight voltage-margin control.
Does the MAX808MEPA+ support battery switchover, and what are the current limits?
Yes, the MAX808MEPA+ supports automatic battery switchover from VCC to BATT when VCC falls below both the reset threshold (4.425V) and VBATT. In battery-backup mode, it delivers up to 20mA to OUT with a typical BATT→OUT on-resistance of 12Ω. The device draws ≤1µA from the battery in standby, enabling multi-year backup for CMOS RAM without significant discharge.
What is the function of the CE IN and CE OUT pins on the MAX808MEPA+?
The CE IN and CE OUT pins implement chip-enable gating to protect CMOS RAM during power failure. During normal operation, CE IN passes directly to CE OUT with 3ns propagation delay. When VCC drops below the reset threshold, the MAX808MEPA+ holds CE OUT enabled for 18µs to allow the µP to complete an ongoing RAM write cycle-preventing data corruption that would occur with immediate CE disable.
How does the LOWLINE output behave relative to the RESET output on the MAX808MEPA+?
The LOWLINE output on the MAX808MEPA+ goes low when VCC falls to 4.477V (52mV above the 4.425V reset threshold), providing a non-maskable interrupt (NMI) to initiate software-controlled shutdown. RESET asserts only after VCC crosses the 4.425V threshold. This 52mV guardband ensures ≥17µs of warning time (typical propagation delay) before reset, allowing firmware to save state and halt peripherals safely.
Is the MAX808MEPA+ pin-compatible with other members of the MAX80x family?
The MAX808MEPA+ shares the same 8-pin DIP package and pinout as all MAX801/MAX808 variants (e.g., MAX808LEPA+, MAX801MEPA+), including identical VCC, GND, RESET, LOWLINE, BATT, OUT, CE IN, and CE OUT assignments. However, functional differences exist: MAX801 includes watchdog (WDI pin) and dual RESET/RESET outputs, while MAX808 omits WDI and provides CE gating-so electrical compatibility requires verifying required features per design.
MAX808MEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.425V
- Output:
- -
- 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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MIC826SYMT-TR
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APX803L20-29SA-7
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