My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX808MCPA+
- Part No.:
- MAX808MCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX808MCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:490
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX808MCPA+ from Maxim Integrated is an 8-pin microprocessor supervisory IC designed for +5V systems, providing precision reset generation (±1.5% accuracy), battery-backed power switchover (250mA VCC / 20mA BATT mode), and CMOS RAM write-cycle protection via CE gating. It features a 4.425V reset threshold, 200ms reset timeout, and guaranteed RESET validity down to VCC = 1V - critical for portable/battery-powered embedded controllers and intelligent instruments.
For engineers reviewing the MAX808MCPA+ datasheet, MAX808MCPA+ pinout, MAX808MCPA+ application, or MAX808MCPA+ equivalent, this page delivers verified circuit role (supervisory reset + backup power switch + CE gate controller), exact package (8-pin plastic DIP), confirmed timing (200ms tRP, 18µs CE hold), true supply current (48µA normal mode), and validated alternatives for brownout-critical µP systems.
Technical Context
The MAX808MCPA+ integrates three independent comparators: reset (4.425V threshold, ±1.5% tolerance), low-line (4.477V rising, 52mV above reset), and battery switchover (VBATT − 0.2V hysteresis). Its BiCMOS process enables precise voltage monitoring while maintaining ultra-low 48µA supply current in normal operation.
Unlike the MAX801, the MAX808MCPA+ omits watchdog functionality but adds dedicated chip-enable gating: CE IN to CE OUT propagation delay is 3–8ns (50Ω/50pF), with automatic 18µs write-completion hold during VCC brownout. The OUT pin switches between VCC and VBATT using dual PMOS pass devices, supporting MaxCap™/SuperCap™ backup sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures reliable µP reset before system logic fails at 4.35V min. |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization after power recovery. |
| Supply Current (Normal Mode) | 48µA - enables multi-year battery life in always-on portable instrumentation. |
| VCC to OUT On-Resistance | 1.2Ω typical - limits voltage drop to ≤220mV at 250mA load for stable RAM supply. |
| BATT to OUT On-Resistance | 12Ω typical - supports 20mA backup current with ≤240mV drop for CMOS RAM retention. |
| CE Propagation Delay | 3–8ns (50Ω/50pF) - compatible with high-speed µPs requiring sub-10ns CE timing. |
| RESET Validity Range | VCC ≥1V - allows reset assertion even during deep brownout conditions. |
Pinout & Package
MAX808MCPA+ uses 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 counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Main +5V supply input | Bypassed with 0.1µF capacitor; powers all internal circuitry except BATT path. |
| 2 - LOWLINE | Active-low low-voltage warning output | Goes low 52mV above reset threshold to trigger NMI for orderly shutdown. |
| 3 - RESET | Active-low reset output | Strong pull-down/weak pull-up; valid down to VCC = 1V; 200ms timeout. |
| 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 18µs write-completion hold on VCC fall. |
| 7 - BATT | Backup battery input | Accepts 2.0–4.5V; switchover occurs when VCC < VRST and VCC < VBATT. |
| 8 - OUT | Output supply to RAM/peripherals | Switches between VCC and BATT; bypassed with 0.1µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables tighter VCC operating margins (4.35V–5.5V) without false resets in industrial temperature range. |
| 18µs CE write-cycle completion hold | Prevents partial RAM writes during brownout by extending CE enable after VCC crosses reset threshold. |
| MaxCap™/SuperCap™ compatibility | Supports large-value backup capacitors (e.g., 0.47F) via VBATT hysteresis and wide VBATT range (2.0–4.5V). |
| 250mA VCC-mode / 20mA BATT-mode switching | Delivers sufficient current for CMOS RAM and small peripherals in both main and backup power domains. |
| RESET guaranteed valid to VCC = 1V | Ensures deterministic reset assertion even under severe undervoltage, critical for fail-safe embedded control. |
Applications
| Portable Medical Instrumentation | Industrial PLC Controller Modules |
|---|---|
Use Scenario: Handheld blood glucose meters and portable ECG monitors require nonvolatile RAM retention during battery swaps and low-power sleep modes. IC Role / Device Role / Timing Role: MAX808MCPA+ provides battery-switchover to preserve RAM data and generates clean reset on power-up/power-down. Use Value: 20mA BATT-mode current and 12Ω BATT-to-OUT resistance ensure >100-hour RAM retention on a single CR2032 cell during main power loss. |
Use Scenario: DIN-rail mounted PLC I/O modules operate in harsh environments with fluctuating 5V supplies from industrial DC-DC converters. IC Role / Device Role / Timing Role: MAX808MCPA+ monitors VCC for brownout, asserts LOWLINE for NMI-triggered firmware save, then holds RESET until stable. Use Value: 52mV LOWLINE hysteresis and 200ms tRP prevent spurious resets during transient dips, improving system uptime in factory automation. |
| Smart Energy Metering Hardware | Embedded Telematics Gateways |
Use Scenario: Electricity meters retain tariff tables and consumption logs across grid outages using supercapacitor backup. IC Role / Device Role / Timing Role: MAX808MCPA+ gates CE signals to FRAM during brownout and switches OUT to SuperCap™ when VCC falls. Use Value: 18µs CE hold time and dual-PMOS OUT switch guarantee complete write cycles to nonvolatile memory before power collapse. |
Use Scenario: Automotive telematics units must survive cold-crank (4.0V dips) and ignition-off battery drain without corrupting GPS log buffers. IC Role / Device Role / Timing Role: MAX808MCPA+ asserts RESET at 4.425V to halt CPU before voltage drops below 4.35V logic threshold. Use Value: ±1.5% reset accuracy prevents premature reset during nominal 4.75–5.25V operation while ensuring fail-safe behavior at true brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809MCPA+ | Single RESET output only; no LOWLINE, CE gating, or BATT switchover - simpler 3-pin SOT23 variant. | Suitable for basic reset-only applications where battery backup and RAM protection are unnecessary. | Select MAX809MCPA+ only if system lacks backup battery, requires minimal footprint, and does not need write-cycle protection. |
| TPS3808G12DBVR | TI part with 1.2V fixed reset threshold, 200ms delay, but no battery switchover or CE gating - designed for low-voltage µPs. | Applicable in 1.2V/1.8V core logic systems; incompatible with +5V RAM backup requirements of MAX808MCPA+. | Choose TPS3808G12DBVR only for sub-2V supply monitoring; not a functional substitute for MAX808MCPA+'s 5V supervisory + backup architecture. |
Compared with MAX809MCPA+, MAX808MCPA+ adds critical battery switchover and CE write protection for RAM integrity; compared with TPS3808G12DBVR, it supports full +5V system supervision with backup power management - neither alternative replicates its integrated 5V supervisory + backup + gating function set.
Availability
MAX808MCPA+ is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC controller modules, smart energy metering hardware, and embedded telematics gateways requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for MAX808MCPA+ 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 demanding industrial, automotive, and computing applications, with expertise in power management and supervisory circuits.
The MAX801/MAX808 product line was engineered specifically for +5V microprocessor systems needing high-accuracy reset, battery-backed RAM retention, and glitch-immune power-fail detection - targeting portable, industrial, and critical embedded control.
FAQ
What is the exact reset threshold voltage for MAX808MCPA+?
The MAX808MCPA+ has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature (−40°C to +85°C). This corresponds to the "M" suffix in the part number and is validated per Maxim's Electrical Characteristics table, where VRST MIN = 4.350V and MAX = 4.500V at TA = TMIN to TMAX.
Does MAX808MCPA+ include a watchdog timer like the MAX801?
No, the MAX808MCPA+ does not include a watchdog timer. It is functionally distinct from the MAX801 series: MAX808MCPA+ focuses on reset supervision, battery switchover, and CE gating for RAM protection, whereas watchdog functionality (WDI input, 1.6s timeout) is exclusive to MAX801 variants.
How does the CE gating feature of MAX808MCPA+ protect CMOS RAM during power failure?
The MAX808MCPA+ holds CE OUT active for 18µs after VCC falls below the 4.425V reset threshold, allowing the µP to complete ongoing RAM write cycles. If the write finishes within that window, CE OUT goes high immediately; otherwise, it deasserts after 18µs - preventing partial or corrupted writes during brownout.
What is the maximum continuous current supported by MAX808MCPA+ on the OUT pin?
In VCC-powered mode, MAX808MCPA+ supports up to 250mA continuous current on the OUT pin with a typical VCC-to-OUT on-resistance of 1.2Ω. In battery-backup mode (VCC = 0V), it delivers up to 20mA with 12Ω BATT-to-OUT resistance - sufficient for standard CMOS RAM retention.
Can MAX808MCPA+ be used with SuperCap™ or MaxCap™ backup sources?
Yes, MAX808MCPA+ is explicitly MaxCap™/SuperCap™ compatible. Its battery switchover threshold hysteresis (VBATT − 0.2V on falling VCC, VBATT + 0.05V on rising VCC) and wide VBATT input range (2.0V–4.5V) allow direct integration with large-value backup capacitors like 0.47F SuperCaps without external circuitry.
MAX808MCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX808MCPA+ FAQ
1.How can I place an order for MAX808MCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX808MCPA+ 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 MAX808MCPA+ reliable?
The price and inventory of MAX808MCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX808MCPA+ is usually 5 days.
3.What payment methods are accepted for MAX808MCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX808MCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX808MCPA+?
MAX808MCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX808MCPA+ 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 MAX808MCPA+?
For technical support, including MAX808MCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX808MCPA+ requirements.
6.How does Aetrix verify that MAX808MCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX808MCPA+ 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 MAX808MCPA+ meets industry standards.
7.What is the process for return or replacement of MAX808MCPA+?
All MAX808MCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX808MCPA+, 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 MAX808MCPA+ part is unused and in its original packaging.
Return procedure for MAX808MCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX808MCPA+ 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…
