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Analog Devices Inc./Maxim Integrated MAX699EWE
- Part No.:
- MAX699EWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX699EWE.pdf
- Description:
- IC SUPERVISOR PWR ON RESET/WATCH
- Quantity:
- Payment:
- Shipping:
Inventory:823
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Product details
Overview
MAX699EWE from Maxim Integrated is an industrial-grade voltage supervisor and watchdog timer IC that monitors +5V supplies in microprocessor systems, asserting a 140ms–500ms open-drain RESET pulse during power-up, brownout (trip at 4.4V–4.75V), or watchdog timeout, with built-in 40mV hysteresis and WDI input requiring toggling every 1s. It operates from -40°C to +85°C in a 16-lead wide SO package.
For engineers reviewing the MAX699EWE datasheet, MAX699EWE pinout, MAX699EWE application, or MAX699EWE equivalent, key selection criteria include its dual RESET outputs (active-low open-drain and active-high), WDO watchdog status flag, 5mA supply current, and compatibility with critical μP power monitoring in harsh environments.
Technical Context
The MAX699EWE integrates a precision bandgap-based voltage comparator with internal hysteresis and a monostable reset timer, triggered by VCC crossing the 4.65V nominal threshold. Its watchdog circuit uses a 1s timeout window with three-level WDI input logic (0.8V/3.8V thresholds) and supports disable-via-open configuration.
Unlike the MAX698EWE, the MAX699EWE adds dedicated WDO output and dual RESET polarity outputs-only available in the 16-pin SO package-enabling simultaneous reset signaling and system activity confirmation without external inversion or logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 3.0V to 5.5V - supports nominal +5V rails with ±0.5V tolerance margin for aging or ripple. |
| Reset Threshold (Power-Up) | 4.65V (typ) - ensures reliable deassertion only after stable +5V rail establishment. |
| Reset Pulse Width | 140ms to 500ms - guarantees sufficient duration for full μP initialization across clock domains. |
| Watchdog Timeout | 1s - provides deterministic software liveliness check without external timing components. |
| Supply Current | 5mA - enables low-overhead integration into power-constrained embedded controllers. |
| Hysteresis | 40mV - prevents oscillatory reset assertion near threshold during slow VCC ramp or noise. |
| WDI Input Threshold | Logic-low ≤0.8V, logic-high ≥3.8V - ensures robust noise immunity on microcontroller GPIO-driven watchdog feed. |
Pinout & Package
MAX699EWE is housed in a 16-lead 0.3-inch wide SOIC (SO) package with exposed pad not present; RoHS-compliant lead-free variant available with '+' suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9 | GND | Chip power ground reference for all internal comparators and outputs. |
| 2, 3 | VCC | +5V supply sense input and IC power rail - dual pins reduce trace impedance impact. |
| 5–8, 10–14 | N.C. | No internal connection - must remain unconnected per datasheet; no pull-up/down required. |
| 11 | WDI | Watchdog input - toggling required every 1s; open = watchdog disabled. |
| 14 | WDO | Watchdog status output - goes low on timeout, high on next WDI edge; high when VCC < 4.4V. |
| 15 | RESET | Active-low open-drain reset output - sinks 1.6mA at 0.4V; requires external pull-up. |
| 16 | RESET | Active-high reset output - drives high at 3.5V min when VCC > threshold; no pull-up needed. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity RESET outputs | Simultaneous active-low (open-drain) and active-high RESET signals eliminate need for external inverters or level shifters. |
| Integrated watchdog timer | Self-contained 1s timeout with three-level WDI input avoids external RC timing networks and calibration drift. |
| 40mV hysteresis | Prevents chatter during slow VCC ramps or noisy supply conditions without external hysteresis resistors. |
| Zero external components | Full reset + watchdog functionality achieved with no capacitors, resistors, or diodes - reduces BOM count and board area. |
| Industrial temperature range | -40°C to +85°C operation enables deployment in motor drives, PLCs, and outdoor instrumentation without derating. |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Desktop and embedded PC motherboards requiring guaranteed reset after cold start or AC dropout. IC Role / Device Role / Timing Role: Primary power-on reset generator and brownout detector with 140ms minimum pulse width. Use Value: Ensures CPU and chipset initialize fully before instruction fetch, preventing lockup from partial power sequencing. | Use Scenario: Programmable logic controllers (PLCs) operating in factory automation with fluctuating 24V-to-5V DC-DC outputs. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 5V rail integrity and validates firmware execution via WDI feed. Use Value: WDO output feeds safety logic to disable I/O modules if firmware hangs, meeting SIL-2 functional safety requirements. |
| Intelligent Instruments | Critical μP Power Monitoring |
Use Scenario: Portable multimeters and oscilloscopes with battery-backed real-time clocks and flash memory. IC Role / Device Role / Timing Role: Resets microcontroller and analog front-end on supply sag, while WDI confirms measurement loop continuity. Use Value: Prevents corrupted EEPROM writes during brownout by holding RESET until VCC stabilizes above 4.65V. | Use Scenario: Medical infusion pumps where undetected μP reset failure could cause dosage errors. IC Role / Device Role / Timing Role: Redundant reset source with independent watchdog path - WDO cross-monitored by secondary controller. Use Value: Dual RESET polarity allows one signal to drive main μP and another to trigger hardware latch for fault logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX698EWE | No watchdog circuit; lacks WDI and WDO pins; single RESET output (open-drain only). | Suitable only for basic power-monitoring applications without software liveliness checking. | Select MAX698EWE when watchdog functionality is unnecessary and board space allows omission of WDO routing. |
| TPS3823-50DBVR | Fixed 5.0V threshold (±1.5%), no watchdog, 200ms reset pulse, SOT-23-5 package. | Limited to compact designs needing only reset - no WDI/WDO support or dual-polarity outputs. | Choose TPS3823-50DBVR for cost-sensitive, space-constrained applications where watchdog is omitted and 5.0V exact threshold is acceptable. |
Compared with MAX698EWE and TPS3823-50DBVR, the MAX699EWE uniquely delivers integrated watchdog supervision plus dual-polarity RESET in a single 16-pin SO package - enabling both robust power sequencing and runtime firmware validation without external components.
Availability
MAX699EWE is available at Aetrix Electronics and suitable for computers, controllers, intelligent instruments, and critical μP power monitoring applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX699EWE 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, designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX698/MAX699 product line targets cost-sensitive, high-reliability microprocessor supervisory functions - delivering integrated reset timing, voltage monitoring, and watchdog capability in minimal footprint packages.
FAQ
What is the function of the WDI pin on the MAX699EWE?
The WDI (Watchdog Input) pin on the MAX699EWE monitors microprocessor activity by requiring a logic toggle at least once every 1 second. If WDI remains static beyond this timeout, the device asserts RESET and (in SO packages) pulls WDO low. Leaving WDI unconnected disables the watchdog function entirely, making MAX699EWE behave like a standard reset supervisor.
Does the MAX699EWE require external components to operate?
No, the MAX699EWE requires zero external components for full operation - including power-on reset, brownout detection, and watchdog supervision. Its internal voltage reference, timing circuitry, and dual-output drivers eliminate the need for external capacitors, resistors, or inverters, reducing BOM count and PCB area while improving reliability.
What is the difference between the two RESET outputs on the MAX699EWE?
The MAX699EWE provides two independent RESET outputs: pin 15 is an active-low open-drain output requiring an external pull-up resistor, while pin 16 is an active-high push-pull output that drives high (≥3.5V) when VCC exceeds the threshold. This dual-polarity capability allows direct interfacing with both legacy and modern μPs without additional logic.
Can the MAX699EWE be used with a 3.3V microprocessor system?
The MAX699EWE is specified for +5V supply monitoring and operates from 3.0V to 5.5V, but its reset threshold is fixed at ~4.65V - making it unsuitable for direct 3.3V rail supervision. For 3.3V systems, use a dedicated 3.3V supervisor such as the MAX6369 or MAX6370; the MAX699EWE must monitor the 5V rail feeding the 3.3V regulator in such architectures.
What does the 'E' suffix indicate in MAX699EWE?
The 'E' suffix in MAX699EWE denotes the industrial temperature grade, specifying operation from -40°C to +85°C. This distinguishes it from the 'C' grade (0°C to +70°C) and ensures reliable performance in demanding environments such as factory automation, transportation electronics, and outdoor instrumentation where thermal extremes occur.
MAX699EWE 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX699EWE FAQ
1.How can I place an order for MAX699EWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX699EWE 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 MAX699EWE reliable?
The price and inventory of MAX699EWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX699EWE is usually 5 days.
3.What payment methods are accepted for MAX699EWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX699EWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX699EWE?
MAX699EWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX699EWE 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 MAX699EWE?
For technical support, including MAX699EWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX699EWE requirements.
6.How does Aetrix verify that MAX699EWE is sourced from the original manufacturer or authorized distributors?
All MAX699EWE 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 MAX699EWE meets industry standards.
7.What is the process for return or replacement of MAX699EWE?
All MAX699EWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX699EWE, 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 MAX699EWE part is unused and in its original packaging.
Return procedure for MAX699EWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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