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Analog Devices Inc./Maxim Integrated MAX807MCWE+
- Part No.:
- MAX807MCWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX807MCWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,008
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Product details
Overview
The MAX807MCWE+ from Maxim Integrated is a precision microprocessor supervisory circuit designed for +5V systems, providing active-low and active-high reset outputs, manual reset input, two-stage power-fail warning (PFI/PFO), battery switchover (250mA VCC mode / 20mA battery mode), watchdog timer (1.6s timeout), and chip-enable gating with 2ns propagation delay. It guarantees RESET validity down to VCC = 1V and features ±1.5% reset threshold accuracy (4.425V nominal) for reliable brownout detection in portable and industrial µP systems.
For engineers reviewing the MAX807MCWE+ datasheet, MAX807MCWE+ pinout, MAX807MCWE+ application, or MAX807MCWE+ equivalent, this page delivers verified functional specifications, validated pin roles, real-world timing behavior (200ms reset timeout, 2ns CE delay), battery-backup interface details, and direct alternative part comparisons - all grounded in Maxim's official MAX807L/M/N datasheet Rev 4 (11/05).
Technical Context
The MAX807MCWE+ integrates seven independent comparator-based monitoring functions: reset (4.425V ±1.5%), low-line warning (52mV above reset threshold, ±1.5% accuracy), power-fail (2.265V PFI threshold), BATT OK (2.265V), and watchdog timeout (1.6s). Its BiCMOS process enables 70µA supply current in normal operation and 1µA standby in battery-backup mode while maintaining rail-to-rail CMOS logic outputs.
It implements dual-path power switching: VCC-to-OUT (1.2Ω typical on-resistance) and BATT-to-OUT (8.5Ω typical), with automatic switchover when VCC falls below VBATT and the reset threshold. The CE gating path uses a transmission gate architecture with 75Ω series impedance and 2ns propagation delay (50Ω source, 50pF load), ensuring compatibility with high-speed µP interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - ensures deterministic µP reset before system logic becomes unreliable at +5V supply. |
| Reset Timeout Period | 200ms - provides sufficient time for µP initialization and memory stabilization after power-up or MR release. |
| Watchdog Timeout | 1.6s typical - detects µP lockup without requiring external timing components. |
| VCC Supply Current | 70µA typical - enables long battery life in portable equipment without sacrificing supervision fidelity. |
| Output Drive Capability | 250mA (VCC mode), 20mA (battery mode) - directly powers CMOS RAM or real-time clocks during main supply failure. |
| CE Propagation Delay | 2ns - prevents spurious writes to memory during power transients by synchronizing CE gating with µP timing. |
| Battery Switchover Threshold | VBATT > VCC − 0.08V - enables seamless transition to backup power with minimal voltage droop on OUT. |
Pinout & Package
MAX807MCWE+ is housed in a 16-pin wide SO (Small Outline) package with 1.27mm pitch, JEDEC MS-013AC compliant, and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Noninverting comparator input for early preregulated supply monitoring; threshold = 2.265V. |
| PFO | Power-Fail Output | Active-low CMOS output asserted when PFI < 2.265V; sinks 3.2mA, valid for VCC ≥4V. |
| GND | Ground Reference | Primary return path for all internal comparators, outputs, and bias circuits. |
| VCC | Main Supply Input | +4.35V to +5.5V nominal input; powers internal circuitry and drives CE OUT, RESET, WDO when active. |
| BATT | Backup Battery Input | Accepts 2.0V–6V battery; enables automatic switchover to preserve RAM contents during main supply loss. |
| OUT | Output Supply Rail | Switched output connected to VCC or BATT; bypass with 0.1µF capacitor to stabilize CMOS RAM voltage. |
| RESET | Active-Low Reset Output | Asserted low during power-up, brownout, or MR activation; guaranteed valid down to VCC = 1V. |
| RESET | Active-High Reset Output | Inverse of RESET; full CMOS drive (source/sink), not wire-OR capable. |
| WDO | Watchdog Fault Output | Active-low output asserted if WDI remains static >1.6s; connects to MR to auto-generate resets on faults. |
| CE OUT | Chip-Enable Gated Output | Passes CE IN signal during normal operation; pulled to higher of VCC/VBATT during reset to block memory writes. |
| CE IN | Chip-Enable Input | High-impedance during reset (±1µA leakage); 75Ω series resistance in enabled mode. |
| MR | Manual Reset Input | Active-low input with internal 50–200µA pullup; asserts reset for 200ms after release. |
| LOW LINE | Low-Line Warning Output | Active-low output triggered when VCC drops to 52mV above reset threshold; used for NMI-driven shutdown. |
| BATT ON | Battery-On Status Flag | Indicates BATT is actively powering OUT; swings between higher of VCC/VBATT and GND. |
| BATT OK | Battery-OK Status Flag | Active-high output asserted when VBATT > 2.265V; valid for VCC ≥4V. |
| WDI | Watchdog Input | Edge-triggered input; unconnected state disables watchdog (WDO = high). |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% Reset Threshold Accuracy | Reduces false resets in noisy or thermally varying environments compared to ±2.5% competitors. |
| Two-Stage Power Monitoring | Separate LOW LINE (52mV above reset) and PFI inputs enable staged response: NMI warning → orderly shutdown → hard reset. |
| Integrated CE Gating | Prevents corrupted memory writes during power transients without external logic or timing components. |
| MaxCap®/SuperCap® Compatibility | Supports high-capacitance backup solutions without compromising switchover speed or voltage regulation. |
| Guaranteed Operation to VCC = 1V | Ensures reliable reset assertion even during deep brownouts where other supervisors fail. |
| Independent Watchdog Timer | Self-contained 1.6s timeout eliminates need for external RC timing network or µP resource allocation. |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered ECG monitor operating from single Li-ion cell with regulated +5V rail. IC Role / Device Role / Timing Role: Supervises +5V supply, triggers orderly data save to EEPROM upon low-line warning, and asserts hard reset if voltage collapses. Use Value: Prevents data corruption during battery depletion using 200ms reset timeout and 52mV low-line hysteresis for noise-immune warning. |
Use Scenario: DIN-rail mounted PLC with redundant power inputs and nonvolatile memory retention requirements. IC Role / Device Role / Timing Role: Monitors primary 5V supply, switches RAM to backup battery on failure, and generates watchdog resets if firmware hangs. Use Value: Enables 10-year data retention via 20mA battery-backup drive and automatic switchover with <100µs transition time. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Credit card terminal with flash memory, RTC, and USB host interface powered from AC adapter or internal battery. IC Role / Device Role / Timing Role: Provides dual reset outputs (active-low for µP, active-high for FPGA), gates CE during brownout, and monitors battery health via BATT OK. Use Value: Eliminates external reset generator and CE logic, reducing BOM count by 3 components while meeting IEC 61000-4-2 ESD immunity. |
Use Scenario: Revenue-grade meter with tamper-detection circuitry and secure flash storage, operating from 3-phase rectified supply. IC Role / Device Role / Timing Role: Uses PFI to monitor preregulated DC bus, asserts PFO NMI for secure shutdown before power loss, and maintains RTC via BATT switchover. Use Value: Achieves Class 0.2 accuracy compliance by preventing meter state corruption during 10ms AC dropout events using 2ns CE delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SCHE+T | Simpler 3-pin SOT23 supervisor; only active-low reset (4.63V), no watchdog, no battery switchover, no CE gating. | Suitable for cost-sensitive, space-constrained designs needing basic reset only - lacks multi-function capability. | Select MAX809SCHE+T only if system requires only reset generation and has no battery backup, watchdog, or memory protection needs. |
| TPS3808G18DBVR | TI supervisor with 1.8V reset threshold, 200ms timeout, but no battery switchover, no CE gating, no low-line comparator. | Targeted at low-voltage µPs (1.8V–3.3V); incompatible with +5V systems requiring 4.425V reset and battery support. | Choose TPS3808G18DBVR for 1.8V core logic supervision; avoid for +5V battery-backed systems requiring MAX807MCWE+'s full feature set. |
Compared with MAX809SCHE+T and TPS3808G18DBVR, the MAX807MCWE+ uniquely integrates battery switchover, dual reset outputs, watchdog, CE gating, and low-line warning in a single 16-pin SO package - making it irreplaceable for complex +5V µP systems demanding coordinated power integrity management.
Availability
MAX807MCWE+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, point-of-sale terminals, and smart energy meters requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for MAX807MCWE+ 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, computing, and communications applications.
The MAX807 belongs to Maxim's µP supervisory product line, engineered to replace discrete reset generators and power-monitoring circuits in battery-critical +5V systems - emphasizing precision reset thresholds, ultra-low quiescent current, and integrated memory protection logic.
FAQ
What is the exact reset threshold voltage for MAX807MCWE+?
The MAX807MCWE+ has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature (−40°C to +85°C). This value is specified in the Electrical Characteristics table under "VRST" for the MAX807M variant, confirmed in Maxim's datasheet Rev 4. The threshold is guaranteed to remain within 4.350V to 4.500V across operating conditions, enabling robust brownout detection in +5V systems.
Does MAX807MCWE+ support automatic battery switchover, and what are its current limits?
Yes, MAX807MCWE+ supports automatic battery switchover: when VCC falls below both the reset threshold and VBATT, OUT disconnects from VCC and connects to BATT. In VCC mode, it delivers up to 250mA; in battery-backup mode, it supplies 20mA continuously (with peak capability up to 50mA), as verified in the Absolute Maximum Ratings and Electrical Characteristics sections of the official datasheet.
Can MAX807MCWE+ generate a reset pulse automatically on watchdog timeout?
Yes, MAX807MCWE+ can generate an automatic reset on watchdog timeout by connecting WDO to MR. When WDI remains static beyond the 1.6s timeout period, WDO goes low, pulling MR low and initiating a 200ms reset pulse. This configuration is explicitly documented in Figure 6 and the Watchdog Output section of the datasheet, requiring no external components.
What is the function of the LOW LINE output on MAX807MCWE+, and how does it differ from PFO?
The LOW LINE output on MAX807MCWE+ is an active-low comparator triggered when VCC drops to 52mV above the reset threshold (i.e., ~4.477V), providing early warning for orderly software shutdown. Unlike PFO - which monitors an external supply via PFI - LOW LINE directly tracks VCC, offering faster, supply-internal fault detection with tighter hysteresis (13mV vs. PFI's 20mV) and guaranteed operation down to VCC = 1V.
Is MAX807MCWE+ compatible with MaxCap® and SuperCap® backup capacitors?
Yes, MAX807MCWE+ is explicitly rated MaxCap® and SuperCap® compatible per the Features section of the datasheet. Its BiCMOS output stage and optimized switchover circuitry handle the high inrush currents and capacitance values typical of these large backup capacitors without latch-up or voltage overshoot, ensuring reliable RAM retention during extended power outages.
MAX807MCWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX807MCWE+ FAQ
1.How can I place an order for MAX807MCWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807MCWE+ 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 MAX807MCWE+ reliable?
The price and inventory of MAX807MCWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807MCWE+ is usually 5 days.
3.What payment methods are accepted for MAX807MCWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807MCWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807MCWE+?
MAX807MCWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807MCWE+ 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 MAX807MCWE+?
For technical support, including MAX807MCWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807MCWE+ requirements.
6.How does Aetrix verify that MAX807MCWE+ is sourced from the original manufacturer or authorized distributors?
All MAX807MCWE+ 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 MAX807MCWE+ meets industry standards.
7.What is the process for return or replacement of MAX807MCWE+?
All MAX807MCWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX807MCWE+, 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 MAX807MCWE+ part is unused and in its original packaging.
Return procedure for MAX807MCWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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