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Analog Devices Inc./Maxim Integrated MAX699CPA+
- Part No.:
- MAX699CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX699CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
MAX699CPA+ from Maxim Integrated is an 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 from 3.0V to 5.5V supply. It is used in embedded controllers requiring reliable power sequencing and processor activity monitoring.
For engineers reviewing the MAX699CPA+ datasheet, MAX699CPA+ pinout, MAX699CPA+ application, or MAX699CPA+ equivalent, key selection criteria include its fixed 4.65V reset threshold with 40mV hysteresis, open-drain RESET output rated for 1.6mA sink, watchdog disable-by-open functionality, and C-grade (0°C to +70°C) temperature rating in lead-free PDIP packaging.
Technical Context
The MAX699CPA+ integrates a precision voltage monitor and monostable watchdog timer in a single IC. Its reset circuit asserts when VCC falls below 4.4V and deasserts at 4.65V, providing 40mV hysteresis to prevent chatter during marginal supply conditions.
The watchdog function monitors the WDI input: if no transition occurs within 1 second, RESET goes low; leaving WDI unconnected disables this feature. The device uses internal reference and timing elements-no external components required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V (deassertion), 4.4V (assertion); ensures clean reset release after stable +5V rail is established |
| Hysteresis | 40mV; prevents oscillation during slow or noisy VCC ramp-up/down |
| Reset Pulse Width | 140–500ms; guarantees sufficient duration for μP initialization across all operating conditions |
| Watchdog Timeout | 1s ±20%; provides deterministic response to firmware lockup without external timing components |
| Supply Range | 3.0V to 5.5V; supports legacy +5V systems and tolerant of transient undershoot |
| RESET Output Type | Open-drain; allows wired-OR configuration and level-shifting with external pull-up |
| WDI Input Threshold | Logic-low ≤0.8V, logic-high ≥3.8V at VCC = 5V; compatible with TTL/CMOS outputs |
Pinout & Package
MAX699CPA+ is housed in an 8-lead plastic dual in-line package (PDIP) with 0.3-inch width, RoHS-compliant and lead-free (indicated by '+' suffix). Pin 1 is top-left corner, notch-up orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 8 | GND | Power ground reference for internal comparators and watchdog logic |
| 2, 3 | VCC | +5V supply input and monitored rail; dual connection improves noise immunity |
| 5 | RESET | Active-low open-drain reset output; sinks up to 1.6mA at 0.4V max |
| 6 | WDI | Watchdog input; toggling required every <1s to prevent reset assertion |
| 7 | N.C. | No internal connection; must be left unconnected or tied to GND/VCC per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Watchdog Timer | 1s timeout with hardware-enforced disable-on-open WDI, eliminating need for external RC or dedicated watchdog IC |
| Precision Reset Threshold | Factory-trimmed 4.65V deassertion with 40mV hysteresis ensures consistent power-on behavior across voltage/temp |
| Zero-External-Component Operation | Requires no capacitors, resistors, or trim pots-reduces BOM count, board area, and qualification effort |
| Open-Drain RESET Output | Supports multi-source reset arbitration and flexible pull-up voltage selection (e.g., 3.3V or 5V domain) |
Applications
| Industrial Controllers | Embedded Data Loggers |
|---|---|
Use Scenario: PLC I/O modules powered from regulated +5V supplies subject to line transients and thermal cycling. IC Role / Device Role / Timing Role: Power-on reset supervisor and watchdog for ARM Cortex-M0 firmware execution. Use Value: Prevents spurious startup and detects frozen control loops via WDI monitoring, ensuring deterministic recovery without manual intervention. | Use Scenario: Battery-backed environmental sensor nodes deployed in remote locations with intermittent power. IC Role / Device Role / Timing Role: Brownout detector and system-level reset initiator during low-VCC events. Use Value: Guarantees 140ms minimum reset hold time even during rapid voltage collapse, preserving EEPROM write integrity and state machine consistency. |
| Medical Diagnostic Instruments | Point-of-Sale Terminals |
Use Scenario: Portable ultrasound processors where firmware crash could compromise patient safety. IC Role / Device Role / Timing Role: Fail-safe watchdog and power-rail monitor co-located with main μP. Use Value: Forces hard reset if WDI stalls >1s-critical for meeting IEC 62304 Class C software safety requirements. | Use Scenario: Retail kiosks exposed to frequent AC cycling and unclean power environments. IC Role / Device Role / Timing Role: Primary reset generator during cold start and brownout recovery. Use Value: Eliminates need for discrete reset IC + RC network, reducing component count while maintaining 4.65V trip accuracy over 0°C to +70°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-on reset and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX698CPA+ | No watchdog input (WDI) or timeout logic; RESET only triggered by VCC monitoring | Suitable where processor supervision is handled externally or unnecessary | Select MAX698CPA+ when watchdog functionality adds cost/complexity without benefit |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no integrated watchdog, 200ms min reset pulse, SOT-23-6 package | Designed for low-voltage digital systems; incompatible with +5V-only monitoring | Choose TPS3808G33DBVR only for 3.3V rail monitoring where space constraints preclude PDIP |
Compared with MAX699CPA+, MAX698CPA+ removes watchdog capability but retains identical reset timing and threshold accuracy, while TPS3808G33DBVR shifts to 3.3V operation and eliminates WDI-making both alternatives non-drop-in replacements for +5V watchdog-critical designs.
Availability
MAX699CPA+ is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic instruments, and point-of-sale terminals requiring stable component supply and long-term manufacturability.
Supply support for MAX699CPA+ 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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and computing markets.
The MAX698/MAX699 product line delivers cost-optimized, zero-component reset and watchdog supervision specifically for +5V microprocessor systems operating in commercial temperature ranges.
FAQ
What is the reset threshold voltage for MAX699CPA+?
The MAX699CPA+ has a factory-trimmed reset deassertion threshold of 4.65V and assertion threshold of 4.4V, with 40mV hysteresis. This ensures reliable power-on sequencing for +5V systems and prevents false resets during marginal supply conditions. The thresholds are guaranteed over the full 0°C to +70°C operating range and do not require external calibration.
How does the watchdog function work on MAX699CPA+?
The MAX699CPA+ watchdog requires the WDI input (Pin 6) to toggle at least once every 1 second. If no transition occurs, RESET pulses low. Leaving WDI unconnected disables the watchdog entirely. This behavior is implemented in hardware with no software dependency, making MAX699CPA+ suitable for safety-critical firmware supervision.
Is MAX699CPA+ pin-compatible with MAX698CPA+?
Yes, MAX699CPA+ and MAX698CPA+ share identical 8-pin PDIP pinouts and footprint. Both use Pins 1/4/8 for GND, 2/3 for VCC, 5 for RESET, and 7 for N.C. However, MAX699CPA+ repurposes Pin 6 as WDI, whereas MAX698CPA+ leaves Pin 6 unconnected-so WDI must be intentionally driven or floated in MAX699CPA+ designs.
What is the maximum sink current capability of the RESET output on MAX699CPA+?
The RESET output on MAX699CPA+ is an open-drain driver specified to sink 1.6mA while maintaining ≤0.4V at the pin when VCC = 4.4V. This allows direct interfacing with standard TTL/CMOS inputs and supports pull-up to voltages up to VCC, enabling flexible reset signaling across mixed-voltage systems.
Does MAX699CPA+ require any external components to operate?
No, MAX699CPA+ operates fully autonomously with zero external components. Its internal voltage reference, timing circuitry, and comparator architecture eliminate the need for external capacitors, resistors, or trimming networks-reducing BOM cost, PCB area, and design validation effort compared to discrete reset solutions.
MAX699CPA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX699CPA+ FAQ
1.How can I place an order for MAX699CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX699CPA+ 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 MAX699CPA+ reliable?
The price and inventory of MAX699CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX699CPA+ is usually 5 days.
3.What payment methods are accepted for MAX699CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX699CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX699CPA+?
MAX699CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX699CPA+ 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 MAX699CPA+?
For technical support, including MAX699CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX699CPA+ requirements.
6.How does Aetrix verify that MAX699CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX699CPA+ 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 MAX699CPA+ meets industry standards.
7.What is the process for return or replacement of MAX699CPA+?
All MAX699CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX699CPA+, 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 MAX699CPA+ part is unused and in its original packaging.
Return procedure for MAX699CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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