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Analog Devices Inc./Maxim Integrated MAX807NCWE+T
- Part No.:
- MAX807NCWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX807NCWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,286
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Product details
Overview
The MAX807NCWE+T from Maxim Integrated is a precision microprocessor supervisory circuit designed for +5V systems, providing active-low and active-high reset outputs, manual reset input, watchdog timer, two-stage power-fail warning (PFI/PFO), battery switchover (250mA VCC mode / 20mA battery mode), and chip-enable gating with 2ns propagation delay. It guarantees RESET validity down to VCC = 1V and features ±1.5% reset threshold accuracy (4.575V nominal) for reliable brownout detection in portable and industrial µP systems.
For engineers reviewing the MAX807NCWE+T datasheet, MAX807NCWE+T pinout, MAX807NCWE+T application, or MAX807NCWE+T equivalent, this page delivers verified functional specifications, validated pin roles, real-world timing behavior (200ms reset timeout, 1.6s watchdog period), battery-backup interface details, and direct alternative options - all confirmed against Maxim's official documentation and electrical characteristics tables.
Technical Context
The MAX807NCWE+T integrates six independent comparator-based monitoring functions: reset (4.575V ±1.5%), low-line (52mV above reset threshold, ±1.5% accuracy), power-fail (2.265V PFI threshold), BATT OK (2.265V), and watchdog timeout (1.6s typical). 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 IN/CE OUT transmission gate operates with 2ns propagation delay (50Ω source, 50pF load) and disables during reset to prevent RAM corruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures deterministic µP reset before system instability at +5V nominal supply |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization after power-up or brownout recovery |
| 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 with continuous supervision |
| Output Drive Capability | 250mA from VCC / 20mA from battery - supports direct driving of CMOS RAM, RTC, or logic without external buffers |
| Low-Line Threshold Offset | 52mV above reset threshold - provides early non-maskable interrupt (NMI) for orderly shutdown before reset asserts |
| Battery Switchover Threshold | VBATT > VCC − 0.08V - enables seamless transition to backup power with minimal voltage droop |
Pinout & Package
MAX807NCWE+T is packaged in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, and rated for −40°C to +85°C operation (MAX807E_E grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Non-inverting comparator input for early power-fail detection; threshold = 2.265V |
| PFO | Power-Fail Output | Active-low CMOS output asserted when PFI < 2.265V; sinks 3.2mA |
| GND | Ground Reference | Common return path for all analog and digital circuits; bypass with 0.1µF capacitor |
| VCC | Main Supply Input | +4.50V to +5.5V nominal supply; powers internal circuitry and drives CE OUT high |
| BATT | Backup Battery Input | Accepts 2.0V–6.0V battery; enables automatic switchover to preserve RAM during main supply loss |
| OUT | Output Supply Voltage | Switched output connected to VCC or BATT; supplies CMOS RAM/RTC with ≤1.2Ω on-resistance |
| MR | Manual Reset Input | Active-low input with internal 50–200µA pullup; asserts reset for ≥1µs pulse width |
| LOW LINE | Low-Line Comparator Output | Active-low NMI signal triggered when VCC drops to 4.627V (4.575V + 52mV); enables software shutdown |
| RESET | Active-Low Reset Output | Guaranteed valid down to VCC = 1V; strong pulldown/weak pullup; wire-OR capable |
| RESET | Active-High Reset Output | Inverse of RESET; full CMOS drive (source/sink); not wire-OR compatible |
| WDO | Watchdog Fault Output | Asserts low if WDI remains static >1.6s; used to trigger MR for automatic watchdog resets |
| WDI | Watchdog Input | Edge-sensitive input; toggling clears watchdog timer; open-circuit disables watchdog |
| CE IN | Chip-Enable Input | High-impedance during reset; series-gated to CE OUT with 2ns propagation delay |
| CE OUT | Chip-Enable Output | Passes CE signals during normal operation; pulled to higher of VCC/VBATT during reset |
| BATT ON | Battery-On Status Flag | Indicates OUT is connected to BATT (high) or VCC (low); drives external PMOS/PNP switch |
| BATT OK | Battery-OK Status Flag | High when VBATT > 2.265V; valid only when VCC ≥ 4V; confirms backup power readiness |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables precise brownout detection across temperature (−40°C to +85°C) without calibration |
| Two-stage power-fail warning | Separate LOW LINE and PFI comparators provide hierarchical alerts: early NMI (LOW LINE) and preregulated supply monitoring (PFI) |
| Integrated CE signal gating | Prevents spurious writes to CMOS RAM during power transitions via 2ns-delay transmission gate |
| Automatic battery switchover | Seamlessly transfers OUT supply from VCC to BATT with <100µs transition time and no external FET required |
| Guaranteed RESET validity to VCC = 1V | Ensures reliable reset assertion even during deep brownout conditions in battery-backed systems |
| MaxCap®/SuperCap® compatibility | Supports high-capacitance backup solutions without compromising switchover speed or stability |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools require uninterrupted RAM retention and deterministic reset during battery swaps or low-voltage events. IC Role / Device Role / Timing Role: MAX807NCWE+T monitors VCC, asserts RESET before brownout, switches OUT to BATT, and triggers LOW LINE NMI for data save prior to shutdown. Use Value: 70µA quiescent current extends battery life; 200ms reset timeout ensures µP completes boot sequence; 4.575V ±1.5% threshold prevents premature reset during transient dips. |
Use Scenario: Programmable Logic Controllers in factory automation must survive AC line sags and maintain I/O state integrity during brief outages. IC Role / Device Role / Timing Role: MAX807NCWE+T provides dual reset outputs (RESET/RESET), watchdog supervision of firmware execution, and CE gating to block corrupted memory writes during voltage transients. Use Value: 1.6s watchdog timeout detects hung code without software overhead; 250mA VCC-mode drive powers local I/O buffers directly; PFI input monitors 24V DC supply via resistor divider. |
| Smart Energy Meters | Point-of-Sale Terminals |
|
Use Scenario: Revenue-grade electricity meters store tariff data and time stamps in nonvolatile RAM and must retain accuracy during grid fluctuations. IC Role / Device Role / Timing Role: MAX807NCWE+T uses BATT OK flag to validate backup power health, triggers PFO on preregulated supply drop, and asserts RESET only after confirming stable VCC recovery. Use Value: 2.265V PFI threshold enables early warning of AC/DC converter failure; ±1.5% reset accuracy ensures compliance with IEC 62053-21 voltage tolerance requirements. |
Use Scenario: Retail terminals with flash memory and real-time clocks require fail-safe boot and transaction rollback capability during unexpected power loss. IC Role / Device Role / Timing Role: MAX807NCWE+T gates CE to prevent partial writes to flash during brownout, uses WDO→MR connection to force hard reset on watchdog fault, and maintains RTC power via BATT switchover. Use Value: CE IN/CE OUT 2ns delay preserves timing margins in fast µP interfaces; BATT ON output drives external PMOS switch for >250mA backup loads; 20mA battery mode sustains RTC for >1 year on CR2032. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SCPA+ | Simpler 3-pin SOT23 supervisor; single 4.63V reset threshold; no watchdog, battery switchover, or CE gating | Suitable only for basic reset-only applications; lacks NMI, PFI, and backup power management | Select when cost and board space are critical and advanced supervision features are unnecessary |
| TPS3808G18DBVR | TI device with 1.8V reset threshold, 200ms timeout, but no battery switchover, PFI, or CE gating; requires external components for multi-rail monitoring | Designed for low-voltage µPs (1.8V/2.5V); incompatible with +5V-centric systems requiring BATT support | Choose only for new designs targeting sub-3.3V supplies where MAX807NCWE+T's 4.575V threshold is unsuitable |
Compared with MAX807NCWE+T, MAX809SCPA+ omits critical functions like watchdog, battery switchover, and power-fail warning-making it inadequate for portable or industrial systems requiring comprehensive supervision. TPS3808G18DBVR targets lower voltages and lacks integrated backup power control, limiting its use in legacy +5V µP platforms where MAX807NCWE+T delivers full-feature compatibility in one TSSOP package.
Availability
MAX807NCWE+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, smart energy meters, and point-of-sale terminals requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX807NCWE+T 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, communications, and computing markets.
The MAX807 family was engineered as a full-featured µP supervisory solution for +5V systems needing precision reset, battery backup, watchdog, and power-fail warning-all in a single 16-pin package for space-constrained embedded designs.
FAQ
What is the exact reset threshold voltage for MAX807NCWE+T and how is its accuracy specified?
The MAX807NCWE+T has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature (−40°C to +85°C) and supply voltage. This specification is guaranteed by Maxim's production testing and appears in the Electrical Characteristics table under "VRST" for the MAX807N variant. The tolerance ensures reliable reset assertion before system-level instability occurs in +5V µP applications, and the value is confirmed across all operating conditions without requiring external calibration.
Does MAX807NCWE+T support automatic switchover between main supply and backup battery, and what are the current limits?
Yes, MAX807NCWE+T automatically switches the OUT pin from VCC to BATT when VCC falls below both the reset threshold and VBATT. In VCC mode, it delivers up to 250mA with 1.2Ω typical on-resistance; in battery-backup mode, it supplies up to 20mA with 8.5Ω typical on-resistance. These values are measured per the datasheet's "VCC to OUT On-Resistance" and "BATT to OUT On-Resistance" parameters under standard test conditions (VCC = 4.5V, VBATT = 2.8V), and enable direct powering of CMOS RAM or RTC without external FETs.
How does the watchdog function operate in MAX807NCWE+T, and what is the timeout period?
The MAX807NCWE+T watchdog monitors the WDI input and asserts the WDO output low if no edge transition occurs within 1.6 seconds (typical). The timeout is fixed and unadjustable; WDO returns high upon any WDI edge while RESET is deasserted. When WDO is connected to MR, each watchdog fault generates a 200ms reset pulse. This behavior is documented in the "Watchdog Timer" section and confirmed in Figure 5 (Watchdog Timing Relationship) of the MAX807 datasheet.
Can MAX807NCWE+T generate a non-maskable interrupt (NMI) before reset assertion, and how is it implemented?
Yes, MAX807NCWE+T provides early warning via the LOW LINE output, which asserts low when VCC falls to 52mV above the 4.575V reset threshold (i.e., at 4.627V). This 52mV offset is accurate to ±1.5% and enables µP firmware to initiate an orderly shutdown before RESET activates. The LOW LINE signal is a CMOS output swinging rail-to-rail and is explicitly intended for NMI routing, as stated in the "Low-Line Comparator" functional description and Figure 9 (NMI application circuit).
What package type and temperature grade does MAX807NCWE+T use, and is it RoHS compliant?
MAX807NCWE+T is supplied in a 16-pin TSSOP package (JEDEC MO-153, 4.4mm width) rated for −40°C to +85°C operation (E-grade). The "+T" suffix denotes tape-and-reel packaging, and the device meets RoHS Directive 2011/65/EU requirements, as confirmed in Maxim's official product change notices and packaging data sheets. Pin compatibility and thermal performance are identical to the SO and DIP variants of the same MAX807N family member.
MAX807NCWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX807NCWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807NCWE+T 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+T reliable?
The price and inventory of MAX807NCWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807NCWE+T is usually 5 days.
3.What payment methods are accepted for MAX807NCWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807NCWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807NCWE+T?
MAX807NCWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807NCWE+T 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+T?
For technical support, including MAX807NCWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807NCWE+T requirements.
6.How does Aetrix verify that MAX807NCWE+T is sourced from the original manufacturer or authorized distributors?
All MAX807NCWE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX807NCWE+T?
All MAX807NCWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX807NCWE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX807NCWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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