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Analog Devices Inc./Maxim Integrated MAX807NCWE+
- Part No.:
- MAX807NCWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX807NCWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
The MAX807NCWE+ from Maxim Integrated is a full-featured microprocessor (µP) supervisory circuit designed for power-supply monitoring, battery switchover, and watchdog timing in embedded systems. It provides active-low and active-high RESET outputs, manual reset input (MR), 2.275V power-fail detection (PFI/PFO), BATT OK status flag, low-line comparator (52mV above reset threshold), and independent watchdog timer with 1.6s timeout. Its ±1.5% reset threshold accuracy (4.575V nominal), 200ms reset timeout, and operation down to VCC = 1V make it suitable for critical µP power monitoring in portable and industrial equipment.
For engineers reviewing the MAX807NCWE+ datasheet, MAX807NCWE+ pinout, MAX807NCWE+ application, or MAX807NCWE+ equivalent, key selection considerations include its dual RESET outputs, battery-backup mode (20mA output), 250mA VCC-mode output, 2ns CE gate propagation delay, and guaranteed reset validity at VCC ≥1V - all critical for reliable system initialization and brownout recovery.
Technical Context
The MAX807NCWE+ integrates seven functional blocks: a precision reset comparator (±1.5% accuracy), low-line comparator (52mV hysteresis above reset threshold), power-fail comparator (2.265V threshold), battery switchover switch (VCC-to-OUT and BATT-to-OUT paths), watchdog transition detector with 1.6s timeout, chip-enable gating logic (2ns propagation), and BATT OK comparator (2.265V threshold). All comparators use BiCMOS architecture for low supply current and high noise immunity.
Its dual-power architecture supports seamless switchover between VCC and VBATT: when VCC drops below the reset threshold and VBATT > 2.0V, OUT connects to BATT; otherwise, OUT connects to VCC. The CE IN/CE OUT gating path disables during reset to prevent RAM corruption, while MR, WDI, and PFI inputs accept TTL/CMOS logic levels with internal pullups or configurable thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% (MAX807N variant); ensures deterministic µP reset before undervoltage lockout in +5V systems. |
| Reset Timeout Period | 200ms minimum; guarantees sufficient time for µP to complete power-up initialization sequence. |
| Supply Current (Normal Mode) | 70µA typical; enables long battery life in portable equipment without compromising supervision fidelity. |
| VCC-to-OUT On-Resistance | 1.2Ω max; minimizes voltage drop under 250mA load, preserving RAM supply integrity during main power operation. |
| BATT-to-OUT On-Resistance | 8.5Ω max; limits dropout under 20mA backup load, sustaining CMOS RAM data retention during extended brownouts. |
| Watchdog Timeout | 1.6s typical; provides robust software execution monitoring with minimal false triggers in noisy environments. |
| Low-Line Threshold Offset | 52mV above reset threshold, ±13mV hysteresis; enables precise early-warning NMI generation for orderly shutdown before reset asserts. |
Pinout & Package
MAX807NCWE+ is supplied in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch), RoHS-compliant and moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI (Pin 1) | Power-Fail Input | Noninverting input of uncommitted comparator; monitors external supply via resistor divider for early power-fail warning. |
| PFO (Pin 2) | Power-Fail Output | Active-low CMOS output asserted when PFI < 2.265V; used to trigger NMI or initiate controlled shutdown. |
| VCC (Pin 3) | Main Supply Input | Nominally +5V supply (4.50V–5.5V range); powers internal circuitry and sources CE OUT and RESET outputs. |
| WDI (Pin 4) | Watchdog Input | Edge-triggered input; toggling within 1.6s prevents WDO assertion; open-circuit disables watchdog. |
| GND (Pin 5) | Ground Reference | Common return for all analog and digital functions; requires low-impedance connection to system ground plane. |
| MR (Pin 6) | Manual Reset Input | Active-low input with internal 50–200µA pullup; initiates 200ms reset pulse when pulled low by switch or logic. |
| LOW LINE (Pin 7) | Low-Line Comparator Output | Active-low CMOS output asserted when VCC falls to 52mV above reset threshold; used for nonmaskable interrupt. |
| RESET (Pin 8) | Active-High Reset Output | CMOS output sourcing/sinking current; inverse of RESET; cannot be wire-OR connected. |
| RESET (Pin 9) | Active-Low Reset Output | Strong-pull-down/weak-pullup structure; valid down to VCC = 1V; supports wire-OR with other reset sources. |
| WDO (Pin 10) | Watchdog Fault Output | Active-low output asserted on watchdog timeout; can be diode-OR connected to MR to auto-generate reset pulses. |
| CE OUT (Pin 11) | Chip-Enable Output | Gated CE signal passed from CE IN; actively pulled to higher of VCC/VBATT when disabled to prevent RAM corruption. |
| CE IN (Pin 12) | Chip-Enable Input | High-impedance during reset; presents 75Ω series resistance in enabled mode; 2ns propagation delay ensures µP timing compliance. |
| BATT ON (Pin 13) | Battery-On Status Flag | CMOS output high when OUT is connected to BATT; drives external PNP/PMOS switch for >250mA backup loads. |
| BATT (Pin 14) | Backup Battery Input | Accepts 2.0V–6.0V battery; enables automatic switchover to preserve RAM during VCC brownout or failure. |
| BATT OK (Pin 15) | Battery-OK Status Flag | Active-high output asserted when VBATT > 2.265V; indicates sufficient battery voltage for reliable backup operation. |
| OUT (Pin 16) | Output Supply Voltage | Switched output connected to VCC or BATT; supplies CMOS RAM, RTC, or other low-power logic during main/battery operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual RESET outputs | Simultaneous active-low and active-high signals eliminate need for external inverters in mixed-logic systems. |
| BiCMOS precision comparators | ±1.5% reset threshold accuracy and 52mV low-line offset enable deterministic timing margins in safety-critical applications. |
| Integrated CE gating | 2ns propagation delay and automatic disable during reset prevent spurious writes to CMOS RAM during power transitions. |
| Two-stage power-fail warning | Independent PFI/PFO and LOW LINE outputs provide both early (pre-reset) and imminent (brownout) fault indication. |
| Battery switchover with status flags | BATT ON and BATT OK outputs allow real-time monitoring of backup path integrity and battery health. |
| Watchdog with auto-reset capability | WDO-to-MR connection enables self-correcting behavior: each watchdog fault generates a 200ms reset pulse. |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Maintains deterministic reset sequencing and RAM retention during AC mains interruption or DC-DC converter fault. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC monitoring, battery-backed RAM hold, and watchdog supervision of firmware execution. Use Value: Prevents control logic corruption during 100ms–500ms brownouts using 200ms reset timeout and 2.275V PFI threshold for early warning. |
Use Scenario: Preserves patient data and real-time clock during battery swap or low-battery conditions in handheld diagnostic devices. IC Role / Device Role / Timing Role: Power supervisor managing switchover between primary Li-ion and backup coin cell, with BATT OK flag validation. Use Value: Ensures uninterrupted data logging via 8.5Ω BATT-to-OUT resistance and 20mA backup output supporting 10-year RTC operation. |
| Automotive Infotainment Head Unit | Smart Energy Meter |
Use Scenario: Handles cold-crank voltage dips (down to 6V) and ignition-cycle transients while maintaining µP state and EEPROM integrity. IC Role / Device Role / Timing Role: Dual-voltage supervisor with low-line comparator generating NMI for graceful UI save before reset assertion. Use Value: 52mV low-line hysteresis and 2.275V PFI threshold provide 15ms–40ms warning window for EEPROM write completion prior to brownout. |
Use Scenario: Guarantees accurate timekeeping and tariff data storage during grid outages lasting hours or days. IC Role / Device Role / Timing Role: Battery-backed supervisor powering RTC and flash memory with BATT ON flag enabling external PMOS switch for high-current backup. Use Value: BATT ON output drives external P-channel MOSFET to deliver >500mA backup current, extending meter runtime beyond internal 20mA limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SCPA+ | Simpler 3-pin SOT23 device; single 4.63V reset threshold; no watchdog, battery switchover, or CE gating. | Limited to basic reset-only applications; unsuitable for battery backup or RAM protection requirements. | Select MAX809SCPA+ only when cost and board space constrain design and advanced features are unnecessary. |
| TPS3808G12DBVR | TI device with 1.2V reset threshold, adjustable timeout, and push-pull RESET; lacks low-line comparator, PFI/PFO, and battery switchover. | Targeted at low-voltage µPs (1.2V–3.3V); incompatible with +5V systems requiring 4.575V reset and dual-supply operation. | Choose TPS3808G12DBVR for sub-3.3V designs needing programmable delay but not multi-rail supervision. |
Compared with MAX809SCPA+ and TPS3808G12DBVR, the MAX807NCWE+ uniquely combines ±1.5% 4.575V reset accuracy, integrated battery switchover, low-line warning, and CE gating - making it irreplaceable for +5V systems requiring comprehensive power integrity management.
Availability
MAX807NCWE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive infotainment head units, smart energy meters, and critical µP power monitoring applications requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX807NCWE+ 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 computing applications.
The MAX807 family was designed as a full-featured µP supervisory solution targeting systems requiring simultaneous reset supervision, battery backup, watchdog timing, and power-fail warning - particularly in portable and mission-critical embedded platforms.
FAQ
What is the reset threshold voltage for MAX807NCWE+ and how precise is it?
The MAX807NCWE+ has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature (–40°C to +85°C). This precision ensures reliable reset assertion before µP operational voltage limits are violated, and is confirmed in the Electrical Characteristics table under VRST for the MAX807N variant. The MAX807NCWE+ designation confirms the N-grade (4.575V) version in TSSOP package.
Does MAX807NCWE+ support battery backup, and what are its current capabilities?
Yes, MAX807NCWE+ supports automatic battery switchover: when VCC falls below the reset threshold and VBATT > 2.0V, OUT connects to BATT. In battery-backup mode, it delivers up to 20mA at ≤8.5Ω on-resistance (VBATT = 2.8V), with BATT OK flag indicating VBATT > 2.265V. This enables sustained CMOS RAM or RTC operation during main power loss.
How does the watchdog timer function in MAX807NCWE+, and what is its timeout period?
The MAX807NCWE+ watchdog timer asserts WDO low if WDI remains static (high or low) longer than 1.6s (typical). WDO returns high upon WDI transition while RESET is deasserted. Connecting WDO to MR creates an auto-reset loop: each timeout triggers a 200ms reset pulse. Watchdog is disabled if WDI is open or VCC < reset threshold.
What is the purpose of the LOW LINE output on MAX807NCWE+, and how is its threshold set?
The LOW LINE output on MAX807NCWE+ provides early power-fail warning, asserting low when VCC falls to 52mV above the reset threshold (i.e., ~4.627V). It features ±13mV hysteresis and is intended to generate a nonmaskable interrupt (NMI) for orderly software shutdown before RESET asserts. Threshold is fixed and factory-trimmed - no external components required.
Can MAX807NCWE+ monitor power supplies other than +5V, and how is that implemented?
Yes, MAX807NCWE+ can monitor non-5V supplies via its PFI input. Applying a scaled version of the target supply (e.g., using a resistor divider) to PFI allows PFO to assert when the divided voltage falls below 2.265V. The 2.275V threshold detector also supports low-battery detection or monitoring of auxiliary rails like +3.3V or +2.5V with appropriate scaling.
MAX807NCWE+ 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:
- 4.425V
- 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
MAX807NCWE+ FAQ
1.How can I place an order for MAX807NCWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807NCWE+ 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 MAX807NCWE+ reliable?
The price and inventory of MAX807NCWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807NCWE+ is usually 5 days.
3.What payment methods are accepted for MAX807NCWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807NCWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807NCWE+?
MAX807NCWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807NCWE+ 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 MAX807NCWE+?
For technical support, including MAX807NCWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807NCWE+ requirements.
6.How does Aetrix verify that MAX807NCWE+ is sourced from the original manufacturer or authorized distributors?
All MAX807NCWE+ 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 MAX807NCWE+ meets industry standards.
7.What is the process for return or replacement of MAX807NCWE+?
All MAX807NCWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX807NCWE+, 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 MAX807NCWE+ part is unused and in its original packaging.
Return procedure for MAX807NCWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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