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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 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:313
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Product details
Overview
MAX807NCWE from Maxim Integrated is a full-featured microprocessor supervisory circuit designed for power monitoring, battery switchover, and watchdog protection in 5V 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 MAX807NCWE datasheet, MAX807NCWE pinout, MAX807NCWE application, or MAX807NCWE equivalent, key selection considerations include its 4.575V reset threshold (N-grade), guaranteed RESET validity down to VCC = 1V, 2ns CE gate propagation delay, 70µA supply current in normal mode, and dual-supply switchover capability between VCC and VBATT for CMOS RAM backup.
Technical Context
The MAX807NCWE integrates six comparators-reset, low-line, power-fail, BATT OK, battery switchover, and watchdog transition detector-within a BiCMOS architecture enabling ±1.5% voltage threshold precision and sub-100µA quiescent current. Its state machine coordinates reset assertion, CE gating disablement, and BATT ON control based on VCC, VBATT, MR, and WDI inputs.
It implements a 200ms internal reset timeout timer that restarts on any VCC dip below VRST, supports wire-OR RESET connections via strong pulldown/weak pullup, and provides chip-enable signal gating with 75Ω series resistance and 2ns typical propagation delay under 50Ω/50pF conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - precise brownout detection for +5V systems with guaranteed validity down to VCC = 1V |
| Reset Timeout Period | 200ms - ensures µP completes full initialization before release from reset |
| Supply Current (Normal) | 70µA typ - enables long battery life in portable equipment |
| VCC-to-OUT Drive | 250mA @ VCC = 4.5V - sufficient to power CMOS RAM or real-time clocks directly |
| Battery Backup Drive | 20mA @ VBATT = 2.8V - maintains logic state during main supply failure |
| Watchdog Timeout | 1.6s typ - detects µP lockup without requiring external timing components |
| Low-Line Threshold Offset | 52mV above reset threshold - provides early NMI warning with ±1.5% accuracy for orderly shutdown |
| CE Propagation Delay | 2ns typ - prevents spurious writes to RAM during power transients |
Pinout & Package
MAX807NCWE is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27mm pitch and body width of 7.5mm. Pin numbering follows JEDEC MS-012, with Pin 1 at top-left corner when notch or dot is oriented upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Noninverting input to uncommitted comparator; triggers PFO low when voltage falls below 2.265V |
| PFO | Power-Fail Output | Active-low CMOS output signaling preregulated supply failure; sinks 3.2mA |
| GND | Ground Reference | Common return path for all analog and digital functions; bypass capacitor required |
| VCC | Main Supply Input | +4.50V to +5.5V nominal supply; powers internal circuitry and drives OUT in normal mode |
| BATT | Backup Battery Input | Accepts 2.0V–6.0V battery; automatically switches OUT to BATT when VCC drops below reset threshold |
| OUT | Output Supply Voltage | Switched rail delivering power to CMOS RAM; connected to VCC or BATT depending on supply status |
| MR | Manual Reset Input | Active-low input with internal 50–200µA pullup; asserts RESET for ≥200ms after release |
| LOW LINE | Low-Line Comparator Output | Active-low NMI signal triggered when VCC falls to 52mV above reset threshold |
| RESET | Active-Low Reset Output | Strong-pull-down/weak-pullup CMOS output; valid down to VCC = 1V; wire-OR capable |
| RESET | Active-High Reset Output | Full-drive CMOS output inverse of RESET; sources/sinks current; not wire-ORable |
| WDO | Watchdog Fault Output | Active-low output asserted if WDI remains static >1.6s; high during reset or when WDI open |
| WDI | Watchdog Input | Edge-sensitive input; toggling clears watchdog timer; floating disables watchdog |
| CE IN | Chip-Enable Input | High-impedance when RESET active; 75Ω series resistance when enabled; gates CE to prevent RAM corruption |
| CE OUT | Chip-Enable Output | Pass-through or disabled CE signal; pulled to higher of VCC/VBATT when gated off |
| BATT ON | Battery-On Status Flag | CMOS output high when OUT is sourced from BATT; drives external PNP/PMOS switch for >250mA loads |
| BATT OK | Battery-OK Status Flag | CMOS output high when VBATT > 2.265V; indicates backup battery is within operational range |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% Reset Threshold Accuracy | Enables stable operation across wide temperature ranges (-40°C to +85°C) without calibration |
| Dual RESET Outputs (active-low & active-high) | Supports both legacy µP reset inputs and modern logic families requiring high-true assertion |
| Independent Watchdog Timer | 1.6s timeout with no external components reduces BOM count and improves system reliability |
| On-Board CE Signal Gating | 2ns propagation delay prevents erroneous memory writes during power transitions |
| Two-Stage Power-Fail Warning | Separate LOW LINE and PFI comparators provide hierarchical warning (early NMI + final PFO) |
| Backup-Battery Switchover Control | Automatic VCC/BATT selection with BATT ON flag enables seamless RAM retention during brownouts |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
|
Use Scenario: PLC I/O modules operating in factory environments with fluctuating 24VDC supplies converted to +5V. IC Role / Device Role / Timing Role: Supervises 5V rail integrity, asserts RESET on brownout, and gates CE to prevent corrupted firmware updates. Use Value: Prevents undervoltage-induced program crashes and preserves nonvolatile configuration data via BATT-backed RAM. |
Use Scenario: Handheld glucose meters powered by coin-cell batteries with intermittent USB charging. IC Role / Device Role / Timing Role: Monitors main supply and battery health, initiates graceful shutdown via LOW LINE NMI before RAM loss. Use Value: Ensures patient data persistence across power cycles using 20mA battery-backup drive and BATT OK flag. |
| Point-of-Sale Terminals | Smart Energy Meters |
|
Use Scenario: Retail terminals with backup supercapacitors maintaining power during AC outages. IC Role / Device Role / Timing Role: Detects VCC collapse, switches RAM to backup source, and signals BATT ON to enable external PMOS switch. Use Value: Delivers 250mA VCC-mode and 20mA battery-mode drive to sustain real-time clock and secure EEPROM. |
Use Scenario: Meters deployed in utility substations experiencing frequent grid sags and lightning-induced transients. IC Role / Device Role / Timing Role: Uses dual comparators (LOW LINE + PFI) to distinguish slow sags from fast faults and trigger tiered responses. Use Value: Achieves ±1.5% reset accuracy over -40°C to +85°C, ensuring compliance with IEC 62053-21 metering standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SCHEXK+T | Single active-low RESET output only; no watchdog, no CE gating, no battery switchover; 4.63V threshold | Suitable for basic reset-only applications without backup or monitoring complexity | Select when cost and footprint are critical and advanced supervision features are unnecessary |
| TPS3808G33DBVR | Adjustable reset threshold (0.4–5.8V); no BATT input or switchover; includes watchdog but no LOW LINE output | Used where flexible voltage monitoring is needed across multiple rails, not battery backup | Choose for multi-rail systems requiring programmable thresholds and smaller 5-pin SOT-23 package |
Compared with MAX807NCWE, MAX809SCHEXK+T lacks battery management and intelligent warning features, while TPS3808G33DBVR omits dual-supply switchover and low-line NMI generation-making MAX807NCWE uniquely suited for battery-critical, safety-aware µP systems requiring coordinated power fail response.
Availability
MAX807NCWE is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, point-of-sale terminals, and smart energy meters requiring stable component supply with long-term lifecycle assurance.
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 specifically for µP-based systems needing precision power monitoring, battery-backed memory retention, and watchdog-based fault recovery-all integrated into a single 16-pin SOIC device.
FAQ
What is the reset threshold voltage for the MAX807NCWE?
The MAX807NCWE has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature. This value is specified for the 'N' grade variant and is guaranteed valid down to VCC = 1V, ensuring robust operation during deep brownout conditions. The threshold is internally trimmed and does not require external components.
Does the MAX807NCWE support battery backup for CMOS RAM?
Yes, the MAX807NCWE provides full battery backup functionality. When VCC falls below the reset threshold and VBATT is present (≥2.0V), the device automatically switches the OUT pin from VCC to BATT. It delivers up to 20mA in battery-backup mode and asserts the BATT ON flag to control external switching transistors for higher-current loads.
How does the watchdog timer function in the MAX807NCWE?
The MAX807NCWE watchdog timer monitors the WDI input and asserts WDO low if no edge transition occurs within 1.6 seconds. WDO can be connected to MR to generate automatic resets on timeout. The watchdog is disabled when WDI is left floating or when VCC is below the reset threshold, ensuring safe behavior during power-up/down sequences.
What is the purpose of the LOW LINE output on the MAX807NCWE?
The LOW LINE output on the MAX807NCWE is an active-low comparator output triggered when VCC falls to 52mV above the reset threshold. It provides an early non-maskable interrupt (NMI) to initiate software-controlled shutdown routines before reset assertion, allowing time-critical data preservation in battery-backed systems.
Can the MAX807NCWE gate chip-enable signals to protect RAM during power failure?
Yes, the MAX807NCWE includes dedicated CE IN and CE OUT pins that implement a transmission gate. During normal operation, CE signals pass through with 2ns typical propagation delay. When RESET is asserted, the gate disables and CE OUT is pulled to the higher of VCC or VBATT, preventing spurious writes to CMOS RAM during power transients.
MAX807NCWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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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