My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX807NEPE+
- Part No.:
- MAX807NEPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX807NEPE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:203
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX807NEPE+ from Maxim Integrated is a full-featured microprocessor supervisory circuit designed for power monitoring, battery switchover, and watchdog functions in embedded µP systems. It provides active-low and active-high RESET outputs, manual reset input (MR), two-stage power-fail warning (PFI/PFO), low-line comparator (52mV above reset threshold), BATT OK flag, and independent watchdog timer with 1.6s timeout. Its ±1.5% reset threshold accuracy (4.575V), 200ms reset timeout, and 250mA VCC-mode output drive support reliable boot-up and brownout recovery in portable and industrial controllers.
For engineers reviewing the MAX807NEPE+ datasheet, MAX807NEPE+ pinout, MAX807NEPE+ application, or MAX807NEPE+ equivalent, key selection considerations include its 4.575V reset threshold (N-version), guaranteed RESET validity down to VCC = 1V, 2ns CE gate propagation delay, 70µA supply current in normal mode, and dual-mode output switching (250mA/VCC or 20mA/battery-backup).
Technical Context
The MAX807NEPE+ integrates six comparators (RESET, LOW LINE, PFI, BATT OK, battery switchover, and watchdog transition detector) with a state machine and oscillator. Its BiCMOS process enables ±1.5% reset threshold accuracy and 70µA typical supply current while supporting simultaneous functions: reset assertion during VCC brownout, NMI generation via LOW LINE at 4.627V (4.575V + 52mV), and automatic CMOS RAM backup switchover when VCC falls below VBATT.
It implements chip-enable gating with 75Ω series resistance and 2ns propagation delay (typical), ensuring glitch-free memory access during power transitions. The watchdog timer clears on WDI transition or RESET assertion, and remains disabled if WDI is unconnected or VCC < reset threshold - enabling safe default behavior in absence of µP activity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - precise power-fail detection for +5V systems; ensures µP reset before logic corruption occurs. |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization and register clearing after power recovery. |
| Supply Current (Normal Mode) | 70µA typ - enables long battery life in portable equipment without sacrificing supervision fidelity. |
| VCC-to-OUT Drive Capability | 250mA - directly powers CMOS RAM or real-time clocks without external FETs in main-supply mode. |
| Battery-Backup Output Current | 20mA - sustains low-power logic (e.g., RTC, SRAM) during extended VCC loss with minimal battery drain. |
| Low-Line Threshold Offset | 52mV above reset threshold - provides deterministic early warning (4.627V) for orderly software shutdown before reset. |
| Watchdog Timeout | 1.6s typ - detects µP lockup while allowing sufficient time for complex firmware tasks between WDI toggles. |
Pinout & Package
MAX807NEPE+ is supplied in a 16-pin plastic DIP package (0.3-inch width), RoHS-compliant and lead-free. Pin numbering follows standard DIP orientation with notch or dot marking pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Noninverting input to uncommitted comparator; sets early power-fail warning threshold via external resistor divider. |
| PFO | Power-Fail Output | Active-low CMOS output asserted when PFI < 2.265V; used for NMI or system-level shutdown signaling. |
| GND | Ground Reference | Primary return path for all internal circuits and output drivers; requires local 0.1µF bypass to VCC. |
| VCC | Main Supply Input | +4.50V to +5.5V nominal supply; powers internal logic and enables VCC-mode output drive (250mA). |
| BATT | Backup Battery Input | Accepts 2.0V–6.0V battery source; enables automatic switchover to preserve RAM/RTC during main supply loss. |
| OUT | Output Supply Voltage | Switched output connected to VCC (normal) or BATT (backup); bypass with 0.1µF capacitor to GND. |
| RESET | Active-Low Reset Output | Asserted low during power-up, brownout, or MR activation; valid down to VCC = 1V; wire-OR capable. |
| RESET | Active-High Reset Output | Inverse of RESET; CMOS output sourcing/sinking capability; not wire-OR compatible. |
| WDO | Watchdog Fault Output | Active-low output asserted if WDI remains static >1.6s; connects to MR to auto-generate watchdog resets. |
| CE OUT | Chip-Enable Output | Gated CE signal passed from CE IN; pulled high to max(VCC, VBATT) when disabled to prevent memory corruption. |
| CE IN | Chip-Enable Input | Input to internal transmission gate; high-impedance during reset to isolate memory interface from unstable CE signals. |
| BATT ON | Battery-On Status Flag | CMOS output high when OUT is connected to BATT; drives external PNP/PMOS switch for >250mA loads. |
| MR | Manual Reset Input | Active-low input with internal 50–200µA pullup; asserts reset for ≥1µs pulse and holds 200ms after release. |
| LOW LINE | Low-Line Comparator Output | Active-low output triggered when VCC falls to 4.627V (52mV above reset); used for nonmaskable interrupt. |
| BATT OK | Battery-OK Status Flag | Active-high output asserted when VBATT > 2.265V; confirms backup battery readiness prior to switchover. |
| WDI | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; open-circuit disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% Reset Threshold Accuracy | Ensures deterministic reset timing across temperature (-40°C to +85°C) and supply variation, eliminating need for external trimming. |
| Two-Stage Power Monitoring | Combines 4.575V reset detection with 4.627V low-line warning - enables 52mV guardband for controlled software shutdown before hardware reset. |
| Integrated Chip-Enable Gating | 2ns CE propagation delay and automatic disable during reset prevent spurious writes to CMOS RAM during power transients. |
| Dual-Mode Output Switching | Seamlessly transitions OUT between VCC (250mA drive) and BATT (20mA drive) based on voltage comparison - no external control logic required. |
| Independent Watchdog Timer | Self-contained 1.6s timeout with WDI edge detection and WDO/MR interlock - provides fail-safe µP supervision without CPU intervention. |
| Battery-OK Monitoring | Dedicated 2.265V comparator with 20mV hysteresis validates backup battery health before switchover, preventing data loss from weak batteries. |
Applications
| Portable Medical Monitors | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter requiring data retention during AC power loss and safe shutdown on low battery. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, BATT OK validation, and automatic RAM backup switchover. Use Value: Prevents clinical data corruption by asserting RESET at 4.575V and initiating orderly shutdown via LOW LINE at 4.627V - preserving 200ms window for flash save. |
Use Scenario: DIN-rail mounted controller operating in factory environments with noisy 24VDC supplies and frequent power dips. IC Role / Device Role / Timing Role: System-level power supervisor generating NMI via PFO on preregulated rail failure and RESET on main 5V rail collapse. Use Value: Dual-comparator architecture (PFI + RESET) isolates primary and secondary supply faults, enabling differentiated response - e.g., log event vs. hard reset. |
| Point-of-Sale Terminals | Smart Energy Meters |
Use Scenario: Credit card terminal with EEPROM-based transaction logging and real-time clock, deployed in retail outlets with unstable mains. IC Role / Device Role / Timing Role: Power integrity manager handling manual reset (button), watchdog supervision (µP heartbeat), and CE gating during brownouts. Use Value: 2ns CE gate propagation prevents memory write errors during 10ms–100ms dips; MR input supports field service reset without power cycle. |
Use Scenario: Revenue-grade meter requiring tamper-proof timekeeping and secure firmware updates during grid fluctuations. IC Role / Device Role / Timing Role: Critical power monitor asserting RESET at 4.575V and triggering BATT ON to enable external PMOS switch for >250mA RTC backup. Use Value: BATT ON output drives external switch to sustain 500mA RTC load - extending backup runtime beyond internal 20mA limit while maintaining ±1.5% reset accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUS+T | Simpler 3-pin SOT23 supervisor; single 2.93V reset threshold; no watchdog, battery switchover, or CE gating. | Only suitable for basic reset-only applications; cannot replace MAX807NEPE+ in systems requiring dual RESET outputs, LOW LINE warning, or RAM backup. | Select only if design needs only power-on reset with minimal footprint and cost - no functional substitution for full supervision. |
| TPS3808G18DBVR | TI supervisor with 1.8V threshold, 200ms delay, and watchdog; lacks battery switchover, BATT OK, and CE gating; different pinout and voltage range (0.8–6V). | Applicable for low-voltage µPs but incompatible with +5V systems requiring 4.575V reset; no support for CMOS RAM backup or power-fail comparator. | Consider for new 1.8V/3.3V designs where battery backup is handled externally; not drop-in or functional replacement for MAX807NEPE+. |
Compared with MAX807NEPE+, MAX809SEUS+T omits all advanced supervision features (watchdog, battery management, CE gating), while TPS3808G18DBVR targets lower-voltage domains and lacks critical +5V-specific functions like low-line warning and BATT OK - making both unsuitable as direct replacements in existing MAX807NEPE+ designs.
Availability
MAX807NEPE+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for MAX807NEPE+ 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 precision analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX807 family was engineered to deliver high-accuracy power supervision for battery-backed µP systems - combining reset, watchdog, power-fail warning, and seamless battery switchover in a single 16-pin package.
FAQ
What is the reset threshold voltage of the MAX807NEPE+?
The MAX807NEPE+ has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature and supply voltage. This value is fixed for the "N" version and is guaranteed across the operating range of VCC = 4.50V to 5.5V. The threshold is internally trimmed and does not require external components. This precise voltage ensures reliable reset assertion before µP operation becomes unstable in +5V systems.
Does the MAX807NEPE+ support battery backup for CMOS RAM?
Yes, the MAX807NEPE+ provides fully integrated battery backup functionality. When VCC falls below the reset threshold and VBATT is present, the device automatically switches the OUT pin from VCC to BATT, delivering up to 20mA to preserve CMOS RAM or real-time clocks. The BATT OK output confirms VBATT > 2.265V before switchover, and the BATT ON pin can drive an external PMOS switch for higher-current loads.
How does the watchdog timer in the MAX807NEPE+ operate?
The MAX807NEPE+ watchdog timer asserts WDO low if the WDI input remains static (high or low) for longer than 1.6 seconds. A transition on WDI clears the timer and returns WDO high, provided RESET is deasserted. If WDI is left unconnected, the internal voltage divider holds it at ~1.8V, disabling the watchdog. Connecting WDO to MR enables automatic system resets on watchdog faults.
Can the MAX807NEPE+ generate an early power-fail warning?
Yes, the MAX807NEPE+ provides two independent early warning paths: the LOW LINE output triggers at VCC = 4.627V (52mV above the 4.575V reset threshold), and the PFI/PFO comparator allows user-defined thresholds via external resistors. Both outputs are CMOS-compatible and can drive µP NMIs to initiate software-controlled shutdown before hardware reset occurs.
What package type is used for the MAX807NEPE+?
The MAX807NEPE+ is packaged in a 16-pin plastic DIP (dual in-line package) with 0.3-inch body width and RoHS-compliant, lead-free finish. This through-hole package supports legacy board assembly and provides robust thermal and mechanical performance for industrial applications requiring long-term reliability.
MAX807NEPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.425V
- 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:
- 16-PDIP
MAX807NEPE+ FAQ
1.How can I place an order for MAX807NEPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807NEPE+ 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 MAX807NEPE+ reliable?
The price and inventory of MAX807NEPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807NEPE+ is usually 5 days.
3.What payment methods are accepted for MAX807NEPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807NEPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807NEPE+?
MAX807NEPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807NEPE+ 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 MAX807NEPE+?
For technical support, including MAX807NEPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807NEPE+ requirements.
6.How does Aetrix verify that MAX807NEPE+ is sourced from the original manufacturer or authorized distributors?
All MAX807NEPE+ 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 MAX807NEPE+ meets industry standards.
7.What is the process for return or replacement of MAX807NEPE+?
All MAX807NEPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX807NEPE+, 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 MAX807NEPE+ part is unused and in its original packaging.
Return procedure for MAX807NEPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX807NEPE+ 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…
