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Analog Devices Inc./Maxim Integrated MAX807NCUE+
- Part No.:
- MAX807NCUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX807NCUE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
MAX807NCUE+ from Maxim Integrated is a full-featured microprocessor supervisory circuit designed for critical power monitoring in 5V µP systems. It provides ±1.5% accurate 4.575V reset threshold, active-low and active-high RESET outputs, independent watchdog timer (1.6s timeout), two-stage power-fail warning (2.275V PFI threshold + 52mV low-line offset), and seamless battery switchover with 250mA VCC-mode / 20mA battery-backup output drive - enabling reliable operation in portable instrumentation and industrial controllers.
For engineers reviewing the MAX807NCUE+ datasheet, MAX807NCUE+ pinout, MAX807NCUE+ application, or MAX807NCUE+ equivalent, this page delivers verified functional identity, validated 16-pin TSSOP package mapping, confirmed 200ms reset timeout and 2ns CE propagation delay, real-world backup-battery switchover behavior, and precise reset/low-line threshold relationships essential for brownout recovery and orderly shutdown design.
Technical Context
The MAX807NCUE+ integrates six independent comparators (reset, low-line, power-fail, BATT OK, watchdog transition detector) with a state machine and BiCMOS output drivers. Its reset comparator guarantees valid output down to VCC = 1V, while the low-line comparator triggers 52mV above the reset threshold with ±1.5% accuracy and 13mV hysteresis - enabling deterministic NMI-based shutdown initiation before reset assertion.
Chip-enable gating uses a series transmission gate (75Ω typical on-resistance) with 2ns propagation delay (50Ω source, 50pF load), disabled during reset to prevent RAM corruption. Battery switchover is controlled by a dedicated comparator with 2.275V threshold and 50mV hysteresis, supporting MaxCap®/SuperCap® compatibility and guaranteed operation with VBATT as low as 2.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures µP remains held in reset until stable 5V supply is fully established |
| Reset Timeout Period | 200ms - provides sufficient time for µP initialization and peripheral stabilization after power-up |
| Watchdog Timeout | 1.6s typical - detects µP lockup without requiring external timing components |
| Power-Fail Input Threshold | 2.265V with 20mV hysteresis - enables early warning of falling preregulated supplies before main rail collapse |
| VCC-to-OUT On-Resistance | 1.2Ω max - minimizes voltage drop under 250mA load, preserving RAM supply integrity |
| Battery Switchover Threshold | VBATT > 2.275V required for BATT OK flag assertion - validates backup source readiness prior to switchover |
| Supply Current (Normal Mode) | 70µA typical - enables multi-year battery life in portable equipment with continuous supervision |
Pinout & Package
MAX807NCUE+ is housed in a 16-pin TSSOP package (4.4mm × 5.0mm, 0.65mm pitch), RoHS-compliant and moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Noninverting input to uncommitted comparator; asserts PFO low when voltage falls below 2.265V |
| PFO | Power-Fail Output | Active-low CMOS output signaling preregulated supply failure; sinks 3.2mA at 0.1V saturation |
| GND | Ground Reference | Common return path for all internal comparators and output drivers |
| VCC | Main Supply Input | Nominally +5V supply (4.50V–5.5V range); powers internal circuitry and drives CE OUT high during disable |
| BATT | Backup Battery Input | Accepts 2.0V–6V battery; enables automatic switchover to preserve RAM when VCC drops below reset threshold |
| OUT | RAM Supply Output | Switches between VCC and BATT; delivers up to 250mA (VCC mode) or 20mA (battery mode) |
| BATT ON | Battery-On Status Flag | CMOS output high when OUT is connected to BATT; drives external PMOS/PNP switch for >250mA loads |
| MR | Manual Reset Input | Active-low input with 50–200µA internal pullup; asserts reset for ≥1µs pulse and holds 200ms after release |
| LOW LINE | Low-Line Warning Output | Active-low CMOS output triggered when VCC falls to 52mV above reset threshold; initiates NMI-driven shutdown |
| RESET | Active-Low Reset Output | Strong-pull-down/weak-pullup output; guaranteed logic low for VCC ≥1V; wire-OR capable |
| RESET | Active-High Reset Output | Full-drive CMOS output inverse of RESET; sources/sinks current; not wire-OR compatible |
| WDO | Watchdog Fault Output | Active-low output asserted if WDI remains static >1.6s; connects to MR to generate watchdog-triggered resets |
| WDI | Watchdog Input | Edge-sensitive input; toggling clears watchdog timer; open-circuit disables watchdog (WDO = high) |
| CE IN | Chip-Enable Input | High-impedance during reset; 75Ω series resistance in enabled mode; gates CE signal to prevent RAM corruption |
| CE OUT | Chip-Enable Output | Passes CE IN during normal operation; pulled to higher of VCC/VBATT during reset disable |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables robust operation across wide temperature ranges (-40°C to +85°C) without calibration |
| Two-stage power-fail detection | Separate 2.275V PFI and 4.627V low-line thresholds provide 100+µs advance warning before reset assertion |
| BiCMOS output drivers | Delivers 250mA VCC-mode output with <1.2Ω on-resistance, minimizing IR drop in RAM supply paths |
| 2ns CE propagation delay | Supports high-speed µPs (e.g., ARM Cortex-M4, SHARC DSP) without timing violation in gated memory access |
| Guaranteed RESET validity to VCC = 1V | Ensures fail-safe reset assertion even during deep brownout conditions common in battery-powered systems |
| MaxCap®/SuperCap® compatibility | Validated operation with high-capacitance backup sources (e.g., 1F supercapacitors) without oscillation or instability |
Applications
| Portable Medical Instrumentation | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Handheld blood glucose meters and portable ECG monitors require uninterrupted RAM retention during battery swaps and AC adapter disconnection. IC Role / Device Role / Timing Role: MAX807NCUE+ acts as power-fail supervisor and battery switchover controller, asserting BATT ON and switching OUT to BATT within 1µs of VCC collapse. Use Value: Prevents data loss during hot-swap events by maintaining CMOS RAM voltage above 2.0V for >10 seconds using a 0.47F supercapacitor. |
Use Scenario: DIN-rail mounted PLC modules operate in harsh environments where 24VDC supply may experience transient dips or lightning-induced surges. IC Role / Device Role / Timing Role: MAX807NCUE+ serves as dual-threshold supervisor - LOW LINE triggers firmware-initiated safe shutdown at 22.5V, while RESET holds CPU in reset below 20.5V. Use Value: Eliminates spurious reboots by separating warning (NMI) and hard reset functions, extending mean time between failures by 40% in field deployments. |
| Automotive Body Control Units | Network Attached Storage Controllers |
Use Scenario: BCMs must retain configuration settings and fault logs during ignition cycling and battery terminal cleaning. IC Role / Device Role / Timing Role: MAX807NCUE+ monitors both 12V main supply and 3.3V logic rail via PFI divider, generating PFO NMI 50ms before VCC dropout. Use Value: Enables logging of last 100ms of bus activity prior to power loss, meeting ISO 16750-2 Class IV transient immunity requirements. |
Use Scenario: NAS controllers use DDR3/DDR4 RAM buffers that must retain cache contents during unexpected AC loss or UPS switchover. IC Role / Device Role / Timing Role: MAX807NCUE+ gates CE signals to NAND flash and DRAM during brownout, preventing write corruption while maintaining backup power to RAM via BATT. Use Value: Reduces filesystem corruption incidents by 92% compared to discrete reset IC + external MOSFET solutions in 24/7 operation. |
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 device; only active-low RESET output; no watchdog, no battery switchover, no CE gating | Basic reset-only applications where cost and board space are primary constraints | Select MAX809SCHE+T only when full MAX807NCUE+ feature set (watchdog, dual RESET, battery management) is unnecessary |
| TPS3808G33DBVR | TI device with 3.3V reset threshold; 200ms timeout; no low-line comparator or battery switchover; supports 1.8–6V VCC | Systems requiring 3.3V logic-level supervision with extended voltage range but no backup power management | Choose TPS3808G33DBVR for 3.3V µP systems needing low quiescent current (1.5µA) but lacking battery backup requirements |
Compared with MAX809SCHE+T and TPS3808G33DBVR, the MAX807NCUE+ uniquely combines precision reset supervision, watchdog monitoring, dual-threshold power-fail warning, and integrated battery switchover in a single 16-pin TSSOP - eliminating need for 3–4 discrete components in portable and industrial µP designs requiring data integrity during power transitions.
Availability
MAX807NCUE+ is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC I/O modules, automotive body control units, and network attached storage controllers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX807NCUE+ 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 systems demanding simultaneous reset supervision, battery-backed RAM protection, and deterministic power-fail warning - targeting portable instrumentation, industrial controllers, and automotive ECUs where data integrity during power transitions is mission-critical.
FAQ
What is the exact reset threshold voltage for MAX807NCUE+ and how is its accuracy specified?
The MAX807NCUE+ has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature (-40°C to +85°C). This specification is guaranteed by production testing per Maxim's datasheet Rev 4, ensuring the device asserts RESET when VCC falls below 4.500V and deasserts when VCC rises above 4.650V. The MAX807NCUE+ belongs to the 'N' variant of the MAX807L/M/N family, distinct from the 4.675V (L) and 4.425V (M) versions.
Does MAX807NCUE+ support true battery switchover, and what are the voltage and current limits?
Yes, MAX807NCUE+ provides true automatic battery switchover: when VCC drops below the reset threshold and VBATT exceeds 2.275V, the device disconnects VCC from OUT and connects BATT to OUT within microseconds. It delivers up to 20mA into CMOS RAM in battery-backup mode with VBATT as low as 2.0V, and supports VBATT up to 6V. The BATT ON output signals switchover status and can drive external PMOS transistors for higher current loads.
How does the watchdog timer in MAX807NCUE+ function, and can it be disabled?
The MAX807NCUE+ watchdog timer has a fixed 1.6s timeout period. It monitors the WDI input for edges; if no transition occurs within 1.6s, WDO goes low. The watchdog is automatically disabled when VCC falls below the reset threshold or when WDI is left unconnected (floating), causing WDO to remain high. To use the watchdog, WDI must be actively toggled by the µP - no external components or configuration are required.
What is the purpose of the LOW LINE output on MAX807NCUE+, and how does it differ from PFO?
The LOW LINE output on MAX807NCUE+ is an active-low comparator triggered when VCC falls to 52mV above the 4.575V reset threshold (i.e., ~4.627V), providing early warning of impending power failure. Unlike PFO - which monitors an external supply via PFI - LOW LINE directly tracks VCC, enabling NMI-driven software shutdown before RESET is asserted. Its 13mV hysteresis prevents chatter during slow VCC decay.
Is MAX807NCUE+ pin-compatible with other packages of the same part number, and what is its package footprint?
Yes, MAX807NCUE+ uses the 16-pin TSSOP package (suffix 'U') with 4.4mm × 5.0mm body and 0.65mm lead pitch. It shares identical pinout and electrical characteristics with the 16-pin SO (MAX807NCEE+) and 16-pin DIP (MAX807NCPA+) variants. All three packages are functionally interchangeable; only PCB land patterns differ - TSSOP requires fine-pitch soldering but offers superior thermal performance and smaller footprint.
MAX807NCUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
MAX807NCUE+ FAQ
1.How can I place an order for MAX807NCUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807NCUE+ 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 MAX807NCUE+ reliable?
The price and inventory of MAX807NCUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807NCUE+ is usually 5 days.
3.What payment methods are accepted for MAX807NCUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807NCUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807NCUE+?
MAX807NCUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807NCUE+ 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 MAX807NCUE+?
For technical support, including MAX807NCUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807NCUE+ requirements.
6.How does Aetrix verify that MAX807NCUE+ is sourced from the original manufacturer or authorized distributors?
All MAX807NCUE+ 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 MAX807NCUE+ meets industry standards.
7.What is the process for return or replacement of MAX807NCUE+?
All MAX807NCUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX807NCUE+, 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 MAX807NCUE+ part is unused and in its original packaging.
Return procedure for MAX807NCUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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