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Analog Devices Inc./Maxim Integrated MAX807MEPE+
- Part No.:
- MAX807MEPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX807MEPE+.pdf
- Description:
- IC SUPERVISOR MPU 16-DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX807MEPE+ 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 (4.425V), 200ms reset timeout, and 250mA VCC-mode output current make it suitable for industrial controllers and portable instrumentation requiring reliable brownout protection.
For engineers reviewing the MAX807MEPE+ datasheet, MAX807MEPE+ pinout, MAX807MEPE+ application, or MAX807MEPE+ equivalent, key selection considerations include its 4.425V reset threshold (M-grade), guaranteed RESET validity down to VCC = 1V, 2ns CE gate propagation delay, 70µA supply current in normal mode, and dual-supply operation supporting VCC-to-BATT switchover with 20mA battery-backup drive capability.
Technical Context
The MAX807MEPE+ integrates six comparators (RESET, LOW LINE, BATT OK, PFI, WDI, and battery switchover) with BiCMOS process technology enabling ±1.5% reset threshold accuracy and sub-70µA quiescent current. Its internal state machine coordinates reset assertion, watchdog timeout detection, and chip-enable gating-ensuring CMOS RAM integrity during power transitions.
It implements dual-path power delivery: OUT connects to VCC when VCC > VBATT and ≥ reset threshold; switches to BATT when VCC falls below threshold and VBATT > 2.0V. The LOW LINE comparator triggers at VRST + 52mV with 13mV hysteresis, providing early non-maskable interrupt signaling before reset activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - precise brownout detection for +5V systems with M-grade tolerance |
| Reset Timeout Period | 200ms - ensures µP completes initialization before release from reset |
| VCC Supply Current | 70µA typical - enables long battery life in portable equipment |
| Output Drive Capability | 250mA in VCC mode / 20mA in battery-backup mode - supports direct CMOS RAM/RTC power switching |
| Watchdog Timeout | 1.6s typical - detects µP lockup without external timing components |
| CE Propagation Delay | 2ns - prevents spurious writes to memory during power transients |
| Battery Switchover Threshold | VBATT > VCC − 0.1V - seamless transition to backup power with minimal voltage droop |
Pinout & Package
MAX807MEPE+ is supplied in a 16-pin plastic DIP package (0.300" wide), RoHS-compliant and lead-free. Pin 1 is PFI; pin 16 is OUT. All pins are CMOS-compatible with rail-to-rail output swing (VCC/GND or higher-of-VCC/VBATT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI (1) | Power-Fail Input | Noninverting comparator input for external voltage monitoring; threshold = 2.265V |
| PFO (2) | Power-Fail Output | Active-low CMOS output asserting when PFI < 2.265V; sinks 3.2mA |
| VCC (3) | Main Supply Input | +4.35V to +5.5V nominal; powers internal circuitry and drives OUT in normal mode |
| WDI (4) | Watchdog Input | Edge-sensitive input; toggling required within 1.6s to prevent WDO assertion |
| GND (5) | Ground Reference | Common return for all analog and digital sections |
| MR (6) | Manual Reset Input | Active-low input with internal 50–200µA pullup; asserts RESET for 200ms after release |
| LOW LINE (7) | Low-Line Comparator Output | Active-low NMI signal triggered when VCC drops to VRST + 52mV |
| RESET (8) | Active-High Reset Output | CMOS output sourcing/sinking current; inverse of RESET; valid down to VCC = 1V |
| RESET (9) | Active-Low Reset Output | Strong pulldown/weak pullup structure; wire-OR capable; asserts during power-up/down/brownout |
| WDO (10) | Watchdog Fault Output | Active-low output asserted on watchdog timeout; high during reset or if WDI unconnected |
| CE OUT (11) | Chip-Enable Output | Gate-controlled CE signal; pulled to higher-of-VCC/VBATT when disabled to block memory access |
| CE IN (12) | Chip-Enable Input | High-impedance during reset; 75Ω series resistance in enabled mode |
| BATT ON (13) | Battery-On Driver | CMOS output indicating BATT is active on OUT; drives external PNP/PMOS switch |
| BATT (14) | Backup Battery Input | Accepts 2.0V–6.0V battery; enables automatic switchover when VCC fails |
| BATT OK (15) | Battery Status Flag | Active-high output indicating VBATT > 2.265V; valid only when VCC ≥ 4V |
| OUT (16) | Output Supply Voltage | Switched output delivering power to CMOS RAM/RTC; sourced from VCC or BATT |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables stable operation across wide temperature ranges (−55°C to +125°C) without calibration |
| Two-stage power-fail warning | Separate LOW LINE comparator (VRST + 52mV) provides 24µs advance warning before RESET assertion |
| On-board CE gating with 2ns delay | Prevents memory corruption during power transients by disabling CE path within 28µs of reset assertion |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior even during deep brownout conditions |
| MaxCap®/SuperCap® compatibility | Supports high-capacitance backup solutions without compromising switchover timing or voltage drop |
| Independent watchdog timer | Self-contained 1.6s timeout eliminates need for external RC timing network |
Applications
| Industrial Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: PLCs and motor controllers operating in environments with unstable 5V supplies subject to load-induced sags. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, early low-line NMI, and watchdog fault detection. Use Value: Prevents firmware corruption during voltage dips by asserting RESET at 4.425V and triggering orderly shutdown via LOW LINE 52mV earlier. |
Use Scenario: Handheld diagnostic devices powered by Li-ion batteries with regulated 5V rails. IC Role / Device Role / Timing Role: Power supervisor managing VCC-to-battery switchover, RAM retention, and BATT OK status monitoring. Use Value: Maintains real-time clock and configuration data during battery swaps using 20mA battery-backup drive and BATT OK flag. |
| Automotive Body Control Modules | Test & Measurement Equipment |
Use Scenario: BCMs exposed to cold-crank (4.0V) and load-dump (18V) events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring µP remains held in reset until stable 5V is restored. Use Value: Guarantees RESET remains valid down to VCC = 1V, enabling safe recovery from deep undervoltage transients. |
Use Scenario: Benchtop oscilloscopes and logic analyzers requiring nonvolatile settings storage and firmware integrity. IC Role / Device Role / Timing Role: Dual-role supervisor handling both main supply monitoring and backup power management for SRAM. Use Value: Uses PFI/PFO to monitor preregulated supplies and generate NMIs for graceful save-before-power-loss sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Single active-low RESET output; no watchdog, no CE gating, no battery switchover; 4.63V threshold | Suitable only for basic reset-only applications without power-fail warning or backup support | Select when system requires only reset generation and cost sensitivity outweighs feature needs |
| TPS3823MPW | TI part with 4.40V threshold, 200ms timeout, but no LOW LINE comparator, no BATT OK, no CE gating | Lacks early power-fail warning and battery management features critical for portable designs | Choose for TI-centric designs where ecosystem compatibility matters more than dual-supply supervision |
Compared with MAX807MEPE+, MAX809SEUR+T omits watchdog, battery switchover, and CE gating-reducing BOM count but eliminating RAM protection and fail-safe shutdown capabilities. TPS3823MPW offers similar reset timing but lacks the LOW LINE comparator and BATT OK flag needed for predictive power management in battery-backed systems.
Availability
MAX807MEPE+ is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, and automotive body control modules requiring stable component supply across extended temperature ranges (−55°C to +125°C) and long lifecycle support.
Supply support for MAX807MEPE+ 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, automotive, and computing applications.
The MAX807 family is designed for high-reliability microprocessor supervision in systems demanding accurate voltage monitoring, battery backup, and watchdog safety-targeting applications where firmware integrity and power-fail resilience are critical.
FAQ
What is the reset threshold voltage of the MAX807MEPE+?
The MAX807MEPE+ has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature. This M-grade specification ensures reliable detection of brownout conditions in +5V systems while allowing margin for supply ripple and drift. The threshold is factory-trimmed and does not require external calibration. The MAX807MEPE+ guarantees correct RESET assertion and deassertion behavior across its full operating range from −55°C to +125°C.
Does the MAX807MEPE+ support battery backup for CMOS RAM?
Yes, the MAX807MEPE+ provides fully integrated battery backup functionality. When VCC falls below the reset threshold and VBATT exceeds 2.0V, the device automatically switches the OUT pin from VCC to BATT, delivering up to 20mA to preserve CMOS RAM or RTC data. The BATT OK output signals when VBATT > 2.265V, and the BATT ON pin drives external PNP/PMOS switches for higher-current loads. The MAX807MEPE+ supports MaxCap®/SuperCap® technologies for extended hold-up time.
How does the watchdog timer function in the MAX807MEPE+?
The MAX807MEPE+ includes an independent watchdog timer with a typical timeout period of 1.6 seconds. It monitors the WDI input for transitions; if no edge occurs within that window, WDO asserts low. WDO can be connected to MR to generate automatic resets on timeout. The timer is cleared during RESET assertion or on any WDI transition while RESET is high. The MAX807MEPE+ reduces supply current by ~10µA when WDI is held at a valid logic level, optimizing battery life in portable applications.
What is the purpose of the LOW LINE output on the MAX807MEPE+?
The LOW LINE output on the MAX807MEPE+ is an active-low comparator output triggered when VCC falls to 52mV above the reset threshold (i.e., VRST + 52mV). It provides early warning-typically 24µs before RESET assertion-enabling the µP to execute an orderly software shutdown. This non-maskable interrupt (NMI) capability allows critical data saving and state preservation before power collapse. The MAX807MEPE+ specifies ±1.5% accuracy for this threshold and includes 13mV hysteresis to prevent chatter during slow VCC decay.
Can the MAX807MEPE+ be used with non-5V power supplies?
Yes, the MAX807MEPE+ supports monitoring of auxiliary supplies via its PFI input, which accepts voltages referenced to GND and compares them to a fixed 2.265V threshold. By using a resistor divider, PFI can monitor supplies ranging from negative rails to >12V. Additionally, the 2.275V threshold detector (used for PFI and low-battery detection) allows adaptation to systems with 3.3V or other reference voltages. The MAX807MEPE+ itself operates from VCC = 4.35V to 5.5V and VBATT = 2.0V to 6.0V, accommodating diverse supply architectures.
MAX807MEPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX807MEPE+ FAQ
1.How can I place an order for MAX807MEPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807MEPE+ 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 MAX807MEPE+ reliable?
The price and inventory of MAX807MEPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807MEPE+ is usually 5 days.
3.What payment methods are accepted for MAX807MEPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807MEPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807MEPE+?
MAX807MEPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807MEPE+ 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 MAX807MEPE+?
For technical support, including MAX807MEPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807MEPE+ requirements.
6.How does Aetrix verify that MAX807MEPE+ is sourced from the original manufacturer or authorized distributors?
All MAX807MEPE+ 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 MAX807MEPE+ meets industry standards.
7.What is the process for return or replacement of MAX807MEPE+?
All MAX807MEPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX807MEPE+, 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 MAX807MEPE+ part is unused and in its original packaging.
Return procedure for MAX807MEPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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