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Analog Devices Inc./Maxim Integrated MAX699EPA+
- Part No.:
- MAX699EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX699EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
MAX699EPA+ from Maxim Integrated is an industrial-grade, 8-pin PDIP power-on reset and watchdog controller for +5V microprocessor systems. It delivers a guaranteed 140ms RESET pulse on power-up, brownout (trip at 4.4V), and power-down, features a 1s watchdog timeout with WDI input, and operates across -40°C to +85°C without external components.
For engineers reviewing the MAX699EPA+ datasheet, MAX699EPA+ pinout, MAX699EPA+ application, or MAX699EPA+ equivalent, key selection criteria include its open-drain RESET output (0.4V @ 1.6mA), 40mV hysteresis, watchdog disable-by-open-WDI capability, and compatibility with legacy 8-pin μP monitoring designs requiring extended temperature support.
Technical Context
The MAX699EPA+ integrates a precision voltage monitor with fixed 4.65V power-up reset threshold and 40mV hysteresis to prevent chatter during supply recovery. Its internal watchdog timer asserts RESET if the WDI input remains static beyond 1 second, and the circuit disables automatically when WDI is left unconnected.
Unlike the SO-package variants, the 8-pin PDIP version (MAX699EPA+) provides only inverted RESET output - no WDO or non-inverted RESET - and uses shared VCC pins (pins 1 & 2) for +5V sensing and chip power, with GND on pins 3 & 4.
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 |
| Reset Threshold (Power-Up) | 4.65V (typ) - guarantees reliable μP initialization before full VCC stabilization |
| Reset Pulse Width | 140ms (min) - exceeds typical processor minimum reset hold time requirements |
| Watchdog Timeout | 1s - provides sufficient window to detect firmware lockup in real-time embedded loops |
| Hysteresis | 40mV - prevents oscillatory reset assertion during slow VCC ramp-up or sag |
| RESET Output Type | Open-drain - enables wired-OR configuration and flexible pull-up voltage selection |
| Supply Current | 5mA (max) - enables low-quiescent operation in battery-backed or standby systems |
Pinout & Package
MAX699EPA+ is housed in an 8-lead plastic dual in-line package (PDIP), compliant with JEDEC MS-001, with 0.3-inch body width and through-hole mounting. Pin 1 is top-left corner (notch side), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VCC | +5V supply sense input and IC power rail - dual connection improves noise immunity and current handling |
| 3, 4 | GND | Chip power ground - dual ground pins reduce ground bounce in noisy digital environments |
| 5 | RESET | Inverted open-drain reset output - active-low, requires external pull-up; asserts during fault conditions |
| 6 | WDI | Watchdog input - three-level logic (low/high/mid); unconnected = watchdog disabled |
| 7, 8 | N.C. | No connection - unused silicon pads; must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Precision Brownout Detection | 4.65V trip with 40mV hysteresis ensures deterministic reset behavior across temperature and supply variation |
| Integrated Watchdog Timer | 1s timeout with automatic disable via floating WDI eliminates need for external timing components |
| Zero-External-Component Operation | Eliminates external RC networks, trim pots, or comparators - reduces BOM count and board area |
| Industrial Temperature Range | -40°C to +85°C operation validated for factory automation, motor control, and outdoor instrumentation |
| Open-Drain RESET Output | Supports mixed-voltage system interfacing and multi-source reset arbitration via wired-OR topology |
Applications
| Programmable Logic Controllers (PLCs) | Industrial Data Acquisition Systems |
|---|---|
Use Scenario: Continuous operation in factory-floor cabinets subject to voltage sags and EMI transients. IC Role / Device Role / Timing Role: Primary power-fail detector and watchdog supervisor for ARM Cortex-M4-based controller modules. Use Value: Prevents silent firmware hangs by forcing hard reset after 1s WDI inactivity, while 140ms pulse ensures full μP core initialization. | Use Scenario: Remote sensor nodes powered from 5V DC-DC converters with marginal line regulation. IC Role / Device Role / Timing Role: Single-chip reset generator with brownout protection for 16-bit ADC and SPI interface logic. Use Value: 40mV hysteresis avoids repeated resets during slow 5V rail recovery; no external components simplify conformal coating and field repair. |
| Medical Diagnostic Equipment | Point-of-Sale (POS) Terminals |
Use Scenario: Battery-backed clinical analyzers requiring fail-safe boot integrity after AC loss. IC Role / Device Role / Timing Role: Power-on reset initiator and watchdog enforcer for safety-critical boot sequence validation. Use Value: Guaranteed 140ms RESET pulse meets IEC 62304 power-cycle timing requirements; E-grade temp range covers storage and operating conditions. | Use Scenario: Retail kiosks deployed in unregulated retail outlets with unstable mains power. IC Role / Device Role / Timing Role: Low-cost, high-reliability reset supervisor for x86-compatible embedded SBCs. Use Value: Eliminates need for discrete reset IC + external watchdog IC, reducing PCB footprint and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-on reset and watchdog controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX699CPA | Same functionality and pinout, but rated for 0°C to +70°C only | Suitable for commercial indoor applications only; not qualified for extended temperature environments | Select MAX699CPA only when ambient operating temperature stays within 0°C–70°C and cost is prioritized over ruggedness |
| TPS3823-46DBVR | Fixed 4.63V reset threshold, no integrated watchdog; SOT-23-5 package | Lacks WDI/WDO functionality; requires external watchdog circuitry for equivalent supervision | Choose TPS3823-46DBVR only when watchdog is unnecessary and board space constraints favor SOT-23 over PDIP |
Compared with MAX699CPA and TPS3823-46DBVR, the MAX699EPA+ uniquely combines industrial temperature rating, integrated watchdog, and 8-pin PDIP compatibility - enabling drop-in replacement in legacy designs where thermal robustness and single-chip supervision are mandatory.
Availability
MAX699EPA+ is available at Aetrix Electronics and suitable for programmable logic controllers, industrial data acquisition systems, medical diagnostic equipment, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX699EPA+ 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, automotive, and communications applications.
The MAX698/MAX699 product line delivers cost-optimized, zero-component reset and watchdog supervision for 5V microprocessor systems - targeting reliability-critical embedded platforms where board space and bill-of-materials simplicity are essential.
FAQ
What is the reset threshold voltage of the MAX699EPA+?
The MAX699EPA+ has a nominal power-up reset deassertion threshold of 4.65V (typical), with a guaranteed range of 4.50V to 4.75V across -40°C to +85°C. Its hysteresis is 40mV, meaning reset reasserts at approximately 4.40V during falling VCC. This threshold is factory-trimmed and requires no external calibration.
How does the watchdog function work on the MAX699EPA+?
The MAX699EPA+ watchdog monitors the WDI pin (pin 6): if WDI remains static (high or low) for more than 1 second, RESET pulses low. Leaving WDI unconnected disables the watchdog entirely. The MAX699EPA+ does not provide WDO output - that feature is exclusive to the 16-pin SO package versions.
Is the MAX699EPA+ pin-compatible with the MAX698EPA+?
Yes, the MAX699EPA+ is pin-compatible with the MAX698EPA+ in the 8-pin PDIP package. Both share identical pinout, VCC/GND/RESET/WDI assignments, and electrical specifications except that MAX699EPA+ adds the WDI input and associated watchdog logic - WDI is a no-connect on MAX698EPA+.
What is the maximum supply current draw of the MAX699EPA+?
The MAX699EPA+ draws a maximum of 5mA under normal operating conditions (VCC = +5V, TA = +25°C). This value remains stable across its full -40°C to +85°C operating range and supports low-power system design without compromising reset timing accuracy or watchdog responsiveness.
Does the MAX699EPA+ support non-5V supplies?
The MAX699EPA+ operates over 3.0V to 5.5V, but its internal voltage monitor is optimized for +5V systems. Below 4.4V, RESET asserts regardless of watchdog state. While it functions at 3.3V logic levels, the reset threshold is not scaled - it remains ~4.65V - so it is not suitable as a 3.3V supply monitor without external level-shifting or scaling circuitry.
MAX699EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX699EPA+ FAQ
1.How can I place an order for MAX699EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX699EPA+ 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 MAX699EPA+ reliable?
The price and inventory of MAX699EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX699EPA+ is usually 5 days.
3.What payment methods are accepted for MAX699EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX699EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX699EPA+?
MAX699EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX699EPA+ 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 MAX699EPA+?
For technical support, including MAX699EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX699EPA+ requirements.
6.How does Aetrix verify that MAX699EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX699EPA+ 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 MAX699EPA+ meets industry standards.
7.What is the process for return or replacement of MAX699EPA+?
All MAX699EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX699EPA+, 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 MAX699EPA+ part is unused and in its original packaging.
Return procedure for MAX699EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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