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Analog Devices Inc./Maxim Integrated MAX699EWE+T
- Part No.:
- MAX699EWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX699EWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,215
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Product details
Overview
MAX699EWE+T from Maxim Integrated is an industrial-grade voltage supervisor and watchdog timer IC that monitors +5V supplies in microprocessor systems, asserts a minimum 140ms active-low RESET pulse during power-up/down and brownout (4.4V–4.75V threshold), and provides watchdog timeout detection at 1s with WDI input monitoring. It operates from -40°C to +85°C in a 16-lead wide SO package.
For engineers reviewing the MAX699EWE+T datasheet, MAX699EWE+T pinout, MAX699EWE+T application, or MAX699EWE+T equivalent, key selection criteria include its guaranteed 140ms reset pulse width, 1s watchdog timeout, open-drain and push-pull RESET outputs (SO only), WDO output, and industrial temperature range - all without external components.
Technical Context
The MAX699EWE+T integrates a precision bandgap-based voltage monitor with 40mV hysteresis and a monostable watchdog timer triggered by WDI transitions. Its dual RESET outputs (active-low open-drain and active-high push-pull) enable flexible interface with diverse logic families and microcontroller reset inputs.
It uses internal timing circuitry for both power-on reset assertion (at VCC < 4.4V) and deassertion (at VCC > 4.65V), while the watchdog function requires WDI toggling within 1s - failure triggers simultaneous RESET and WDO low pulses. WDI is a three-level input with defined logic thresholds (0.8V/3.8V) and leakage current specs (±50µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 3.0V to 5.5V - supports nominal +5V systems with ±0.5V tolerance and brownout detection down to 4.4V |
| Reset Pulse Width | 140ms to 500ms - ensures reliable μP initialization across full temperature range (-40°C to +85°C) |
| Watchdog Timeout | 1s - provides deterministic firmware hang detection without external RC timing components |
| Voltage Threshold Hysteresis | 40mV - prevents oscillation during slow-rising/falling supply transitions |
| RESET Output Type | Open-drain (pin 15) and push-pull (pin 16) - enables direct connection to TTL, CMOS, or microcontroller reset pins |
| WDO Output | Active-low push-pull (pin 14) - delivers independent watchdog status signal for system diagnostics or fail-safe logic |
| Supply Current | 5mA - low quiescent consumption suitable for always-on monitoring in embedded systems |
Pinout & Package
MAX699EWE+T is housed in a 16-lead 0.3in wide SO (small outline) package with 1.27mm pitch, RoHS-compliant, and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9 | GND | Chip power ground reference for all internal circuits and output drivers |
| 2, 3 | VCC | +5V supply sense input and IC power rail - dual VCC pins reduce trace inductance |
| 5–8, 10–14 | N.C. | No internal connection - must be left unconnected on PCB |
| 11 | WDI | Watchdog input - toggling required every ≤1s; open = watchdog disabled |
| 14 | WDO | Watchdog output - active-low signal indicating watchdog timeout event (MAX699 SO only) |
| 15 | RESET | Active-low open-drain reset output - requires external pull-up for μP reset assertion |
| 16 | RESET | Active-high push-pull reset output - directly drives CMOS/TTL reset inputs without pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Dual RESET outputs | Simultaneous open-drain and push-pull RESET signals eliminate need for external level-shifting or pull-up resistors |
| Integrated watchdog timer | 1s timeout with WDI input eliminates external RC network and reduces BOM count by ≥3 components |
| Precision voltage monitoring | 4.65V reset deassertion threshold with 40mV hysteresis ensures stable operation during supply transients |
| Zero external components | Self-contained reset generation and watchdog supervision require no capacitors, resistors, or trimming |
| Industrial temperature grade | -40°C to +85°C operation supports deployment in harsh environments including factory automation and outdoor instrumentation |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Continuous operation of programmable logic controllers in factory-floor environments with fluctuating 5V rails. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog timer ensuring deterministic reset assertion and firmware hang recovery. Use Value: Prevents lockup during voltage sags or software faults via guaranteed 140ms RESET pulse and 1s watchdog timeout. | Use Scenario: Power sequencing and runtime integrity monitoring in portable ultrasound or patient monitors. IC Role / Device Role / Timing Role: Dual-mode RESET generator (open-drain + push-pull) interfacing with mixed-voltage SoC reset domains. Use Value: Eliminates external pull-ups and simplifies layout while maintaining compliance with IEC 62304 safety-critical reset timing requirements. |
| Telecom Line Cards | Energy Metering Gateways |
Use Scenario: Uninterrupted operation of carrier-grade line cards exposed to thermal cycling and EMI. IC Role / Device Role / Timing Role: Brownout detector and watchdog supervisor for ARM-based control processors. Use Value: 40mV hysteresis prevents false resets during transient supply droops; WDO output feeds FPGA health monitoring logic. | Use Scenario: Long-life AMI gateways operating 24/7 in utility substations with wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade power-on reset and firmware watchdog for MIPS-based metering SoCs. Use Value: -40°C to +85°C rating and zero-component design ensure 15+ year field reliability without calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor and watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX698EWE+T | Lacks watchdog functionality and WDO output; single open-drain RESET only | Suitable only where firmware hang detection is not required | Select MAX699EWE+T when system-level fault recovery mandates watchdog supervision |
| TPS3808G33DBVR | Fixed 3.3V supply monitoring; no WDI/WDO; 200ms reset pulse; different pinout | Designed for 3.3V systems, not +5V; no watchdog capability | Choose MAX699EWE+T for +5V systems requiring integrated watchdog and dual RESET outputs |
Compared with MAX698EWE+T and TPS3808G33DBVR, the MAX699EWE+T uniquely combines +5V brownout monitoring, 1s watchdog supervision, and dual-mode RESET outputs in a single 16-pin SO package - enabling robust, component-free reset architecture for industrial microprocessor systems.
Availability
MAX699EWE+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom line cards, and energy metering gateways requiring stable component supply and long-term lifecycle support.
Supply support for MAX699EWE+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 is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, connectivity, and security applications.
The MAX698/MAX699 product line delivers low-cost, zero-component power-on reset and watchdog supervision for +5V microprocessor systems - targeting cost-sensitive, high-reliability industrial and instrumentation designs.
FAQ
What is the guaranteed reset pulse width for MAX699EWE+T?
The MAX699EWE+T guarantees a minimum reset pulse width of 140ms across its full operating temperature range (-40°C to +85°C), with typical duration up to 500ms. This ensures sufficient time for microprocessor initialization and memory stabilization before release from reset. The pulse width is internally generated and does not depend on external components. MAX699EWE+T maintains this specification under all valid supply conditions from 3.0V to 5.5V.
Does MAX699EWE+T support both 3.3V and 5V systems?
MAX699EWE+T is specifically designed for +5V supply monitoring, with a nominal reset threshold of 4.65V and brownout assertion at 4.4V. It operates over 3.0V to 5.5V but is not optimized for 3.3V systems - its voltage detection window is centered on 5V rails. For 3.3V applications, dedicated supervisors like the TPS3808 series are recommended. MAX699EWE+T remains functional only when VCC is within its specified range, and its reset behavior is calibrated for +5V use cases.
How is the watchdog function disabled on MAX699EWE+T?
The watchdog function on MAX699EWE+T is disabled by leaving the WDI (pin 11) unconnected - no pull-up or pull-down resistor is required. When WDI floats, the internal watchdog circuit is inactive and will not assert RESET or WDO due to timeout. This allows hardware configuration flexibility: connect WDI to a microcontroller GPIO for active supervision, or leave it open for reset-only operation. MAX699EWE+T retains full voltage monitoring functionality regardless of WDI state.
What are the two RESET outputs on MAX699EWE+T used for?
MAX699EWE+T 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 capable of directly driving CMOS or TTL reset inputs. This dual-output architecture eliminates interface compatibility issues - the open-drain version supports wired-OR configurations and mixed-voltage systems, while the push-pull version simplifies connections to modern microcontrollers. Both outputs are asserted simultaneously during reset events. MAX699EWE+T's design removes the need for external logic translation.
Is MAX699EWE+T RoHS-compliant and lead-free?
Yes, MAX699EWE+T is RoHS-compliant and supplied in lead(Pb)-free packaging, indicated by the "+" suffix in the part number. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for the 16-lead wide SO package and is qualified for reflow soldering per industry standards. Maxim Integrated confirms full compliance with EU RoHS Directive 2011/65/EU and China RoHS. MAX699EWE+T's lead-free construction supports environmentally responsible manufacturing without compromising electrical or thermal performance.
MAX699EWE+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:
- 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+T FAQ
1.How can I place an order for MAX699EWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX699EWE+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 MAX699EWE+T reliable?
The price and inventory of MAX699EWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX699EWE+T is usually 5 days.
3.What payment methods are accepted for MAX699EWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX699EWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX699EWE+T?
MAX699EWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX699EWE+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 MAX699EWE+T?
For technical support, including MAX699EWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX699EWE+T requirements.
6.How does Aetrix verify that MAX699EWE+T is sourced from the original manufacturer or authorized distributors?
All MAX699EWE+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 MAX699EWE+T meets industry standards.
7.What is the process for return or replacement of MAX699EWE+T?
All MAX699EWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX699EWE+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 MAX699EWE+T part is unused and in its original packaging.
Return procedure for MAX699EWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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