My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX801NEPA+
- Part No.:
- MAX801NEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX801NEPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,508
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX801NEPA+ from Maxim Integrated is a +5V microprocessor supervisory IC providing precision reset generation, battery switchover, low-line warning (NMI), and watchdog timer functionality for embedded µP systems. It features ±1.5% reset threshold accuracy (4.575V nominal), 200ms reset timeout, guaranteed RESET validity down to VCC = 1V, and operates across –40°C to +85°C in 8-pin PDIP package.
For engineers reviewing the MAX801NEPA+ datasheet, MAX801NEPA+ pinout, MAX801NEPA+ application, or MAX801NEPA+ equivalent, this page delivers verified technical context, real-world timing behavior, battery-backup mode operation, watchdog timeout constraints, and validated alternative options for critical power-monitoring designs.
Technical Context
The MAX801NEPA+ integrates three independent comparators (reset, low-line, battery switchover), a 1.6s watchdog timer with WDI transition detection, and an active-low RESET output with strong pull-down/weak pull-up structure. Its BiCMOS process enables ±1.5% reset threshold tolerance over temperature and supply voltage.
It implements dual-mode power delivery: in normal operation, OUT connects to VCC (250mA capable); during brownout, it switches to BATT (20mA max, 12Ω on-resistance) when VCC falls below both VRST and VBATT. The low-line comparator triggers 52mV above VRST to initiate orderly shutdown via NMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures reliable µP reset before functional voltage violation |
| Reset Timeout | 200ms minimum - guarantees sufficient time for µP initialization after power recovery |
| Watchdog Timeout | 1.6s typical - detects software hang by requiring WDI transition within this window |
| VCC Validity Range | 4.5V to 5.5V - supports standard +5V µP rails with margin for ripple and droop |
| RESET Output Validity | Valid down to VCC = 1V - maintains reset assertion during deep brownout |
| Battery Switchover Hysteresis | 50mV - prevents oscillation during VCC crossing near VBATT |
| Supply Current (Normal) | 68µA typical - enables long battery life in portable applications |
Pinout & Package
MAX801NEPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, through-hole mounting, and industry-standard pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Main +5V 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 52mV above reset threshold to trigger NMI for controlled shutdown |
| 3: RESET | Active-low reset output | Guaranteed logic low for VCC < VRST; remains asserted ≥200ms after VCC rises above VRST |
| 4: GND | Ground reference | 0V reference for all comparators, outputs, and internal biasing |
| 5: RESET | Active-high reset output | Inverse of RESET; CMOS-compatible, source/sink capable, not wire-ORable |
| 6: WDI | Watchdog input | Transition (low↔high) required every ≤1.6s; unconnected disables watchdog |
| 7: BATT | Backup battery input | Accepts 2.0V–4.5V; enables switchover to battery when VCC < VRST and VCC < VBATT |
| 8: OUT | Output supply rail | Delivers power to RAM/µP from VCC (250mA) or BATT (20mA); bypassed with 0.1µF |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | ±1.5% threshold accuracy over –40°C to +85°C ensures consistent reset point across environments |
| Low-line comparator with NMI output | 52mV offset above reset threshold provides deterministic early-warning signal for software-controlled shutdown |
| Integrated watchdog timer | 1.6s timeout with edge-sensitive WDI input detects stalled code execution without external components |
| Battery switchover control | Automatic VCC-to-BATT transfer at defined thresholds preserves RAM data during main supply loss |
| MaxCap™/SuperCap™ compatibility | VBATT can exceed VCC during normal operation; hysteresis supports large-capacitor backup sources |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered handheld diagnostic units requiring nonvolatile RAM retention during AC dropout or battery swap. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, battery switchover to preserve SRAM, and early low-line warning for graceful data save. Use Value: Prevents data corruption during power transitions using guaranteed 200ms reset hold and 52mV early-warning margin. |
Use Scenario: DIN-rail mounted programmable logic controllers operating in harsh factory environments with unstable 24VDC-to-5V conversion. IC Role / Device Role / Timing Role: Reset generator and watchdog supervisor ensuring deterministic µP restart after brownout and detecting firmware lockup. Use Value: ±1.5% reset accuracy avoids false resets from supply ripple; 1.6s watchdog enforces software liveness without external timers. |
| Embedded Point-of-Sale Terminals | Military Communications Radios |
Use Scenario: Compact retail terminals powered from USB or wall adapter, with optional coin-cell backup for transaction log retention. IC Role / Device Role / Timing Role: Dual-role supervisor managing power-fail response (LOWLINE→NMI) and memory write protection during sudden disconnect. Use Value: 0.1µF bypassed OUT and BATT pins enable clean switchover; CE gating not applicable (MAX801 variant). |
Use Scenario: Ruggedized HF/VHF radios deployed in vehicles where engine cranking causes severe 12V bus sag affecting 5V regulation. IC Role / Device Role / Timing Role: Critical power monitor asserting RESET at precisely 4.575V to prevent µP operation outside spec during voltage transients. Use Value: Guaranteed RESET validity to VCC = 1V ensures reset remains asserted even during deep sag events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SESA+ | Simpler 3-pin SOT23 reset-only IC; no watchdog, no battery switchover, no LOWLINE; 4.63V threshold | Only suitable for basic reset generation in space-constrained, non-battery-backed designs | Select only if battery backup, NMI warning, and watchdog functions are unnecessary |
| TPS3808G18DBVR | Adjustable reset threshold (via external resistor); no integrated battery switchover or LOWLINE; 1.8V–5.5V supply range | Used in multi-rail systems needing flexible reset points but lacking backup-power management | Choose when design requires programmable threshold and operates outside +5V domain |
Compared with MAX801NEPA+, MAX809SESA+ omits critical battery-switchover and watchdog capabilities needed for portable reliability, while TPS3808G18DBVR lacks low-line warning and integrated power-path control-making MAX801NEPA+ uniquely suited for +5V µP systems requiring full brownout resilience.
Availability
MAX801NEPA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, embedded point-of-sale terminals, military communications radios, and critical µP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX801NEPA+ 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 markets.
The MAX801 family was designed specifically for robust +5V microprocessor supervision in battery-backed, mission-critical embedded systems-emphasizing precision reset, fail-safe memory retention, and deterministic watchdog behavior.
FAQ
What is the exact reset threshold voltage for MAX801NEPA+?
The MAX801NEPA+ has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature and supply voltage. This value is confirmed by the "N" suffix in the part number per Maxim's ordering table and is validated in the Electrical Characteristics section under VRST parameter for MAX80_N variants. The threshold remains stable across –40°C to +85°C operation.
Does MAX801NEPA+ support battery backup for CMOS RAM?
Yes, MAX801NEPA+ supports battery backup for CMOS RAM via its BATT and OUT pins. When VCC falls below both the reset threshold (4.575V) and VBATT, the device automatically switches OUT from VCC to BATT, delivering up to 20mA with ~12Ω on-resistance. This preserves RAM contents during main supply loss, as detailed in the Battery-Backup Mode section of the datasheet.
How does the watchdog timer in MAX801NEPA+ function?
The MAX801NEPA+ watchdog timer asserts RESET if the WDI pin remains static (high or low) for longer than 1.6 seconds. A rising or falling edge on WDI clears the timer; RESET deassertion restarts counting. Leaving WDI unconnected disables the watchdog via an internal voltage divider. This behavior is exclusive to the MAX801 series-not present in MAX808-and is fully documented in the MAX801 Watchdog Timer section.
Can MAX801NEPA+ generate a non-maskable interrupt (NMI)?
Yes, MAX801NEPA+ generates a non-maskable interrupt via its LOWLINE output. LOWLINE goes active-low when VCC falls to 52mV above the reset threshold (i.e., at 4.627V), providing deterministic early warning before reset occurs. This signal is intended to drive the µP's NMI input, enabling software-initiated shutdown-confirmed in the Pin Description and Detailed Description sections.
What package type and temperature range does MAX801NEPA+ use?
MAX801NEPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3-inch width and is rated for operation from –40°C to +85°C (E-grade). The "E" in "NEPA+" denotes the extended temperature range, and the "+" suffix indicates lead-free packaging per Maxim's ordering conventions-verified in the Ordering Information table and Absolute Maximum Ratings section.
MAX801NEPA+ 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:
- 4.575V
- Output:
- -
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX801NEPA+ FAQ
1.How can I place an order for MAX801NEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX801NEPA+ 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 MAX801NEPA+ reliable?
The price and inventory of MAX801NEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX801NEPA+ is usually 5 days.
3.What payment methods are accepted for MAX801NEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX801NEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX801NEPA+?
MAX801NEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX801NEPA+ 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 MAX801NEPA+?
For technical support, including MAX801NEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX801NEPA+ requirements.
6.How does Aetrix verify that MAX801NEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX801NEPA+ 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 MAX801NEPA+ meets industry standards.
7.What is the process for return or replacement of MAX801NEPA+?
All MAX801NEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX801NEPA+, 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 MAX801NEPA+ part is unused and in its original packaging.
Return procedure for MAX801NEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX801NEPA+ 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…
