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Analog Devices Inc./Maxim Integrated MAX6303CPA+
- Part No.:
- MAX6303CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6303CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,492
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Product details
Overview
MAX6303CPA+ from Maxim Integrated is an active-low, push-pull reset supervisory IC for +5V microprocessor systems, featuring adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2ms with 1500pF), adjustable watchdog timeout (2.8–5.2ms normal / 1.4–2.6s extended), 4µA supply current, and guaranteed RESET assertion down to VCC = 1V. It monitors power rails in embedded controllers and portable equipment requiring reliable brownout protection.
For engineers reviewing the MAX6303CPA+ datasheet, MAX6303CPA+ pinout, MAX6303CPA+ application, or MAX6303CPA+ equivalent, this page delivers verified electrical parameters, validated PDIP-8 pin mapping, confirmed reset/watchdog timing behavior, and real-world design implications for battery-powered and medical-grade systems.
Technical Context
The MAX6303CPA+ implements a precision bandgap-based reset comparator with 20mV hysteresis and a 1.22V internal reference, enabling external resistor-divider programming of reset thresholds above 1.22V. Its reset timeout and watchdog timeout are independently set via external capacitors on SRT and SWT pins, each sourcing a stable 500nA timing current.
It supports dual watchdog modes: normal mode (WDS = GND) yields µs-range timeouts; extended mode (WDS = VCC) multiplies timeout by 500×, enabling minute-scale supervision. The push-pull active-low RESET output drives up to 0.4V low at 0.8mA sink, with guaranteed assertion at VCC ≥ 1V - critical for low-voltage brownout detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - operates across full industrial logic rail range, including degraded 2V battery conditions. |
| Quiescent Supply Current | 4.0µA typical - enables >1-year operation on coin-cell batteries in sleep-mode systems. |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - ensures precise brownout detection without calibration overhead. |
| Reset Timeout (CSRT = 1500pF) | 2.8–5.2ms - matches typical µP reset recovery windows; programmable via capacitor value. |
| Watchdog Timeout (Normal) | 2.8–5.2ms (CSWT = 1500pF) - aligns with fast software loop servicing intervals. |
| Watchdog Timeout (Extended) | 1.4–2.6s (CSWT = 1500pF, WDS = VCC) - supports long idle periods in wake-up timer applications. |
| VCC to RESET Delay | 63µs - guarantees immediate reset assertion during rapid power collapse. |
Pinout & Package
MAX6303CPA+ is housed in an 8-pin plastic DIP (PDIP) package, RoHS-compliant with lead-free finish indicated by the '+' suffix. Pin spacing is 0.300", body width 0.355", and it is compatible with standard through-hole PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Reset threshold input | High-impedance node for external resistor divider; sets VRST = 1.22 × (R1 + R2)/R2. |
| 2 - GND | Ground reference | Primary return path for all internal current sources and output drivers. |
| 3 - SRT | Reset timeout capacitor input | Sources 500nA to CSRT; tRP = 2.67 × CSRT (pF) in µs - requires low-leakage ceramic cap. |
| 4 - SWT | Watchdog timeout capacitor input | Sources 500nA to CSWT; tWD = 2.67 × CSWT (pF) in µs - same capacitor requirements as SRT. |
| 5 - WDS | Watchdog mode select | Logic input: GND = normal mode (µs timeout), VCC = extended mode (500× multiplier). |
| 6 - WDI | Watchdog trigger input | Edge-sensitive input; transition within timeout period resets watchdog timer - minimum pulse width 30ns. |
| 7 - RESET | Active-low push-pull reset output | Drives low to 0.4V @ 0.8mA; asserts during brownout, power-down, or watchdog timeout. |
| 8 - VCC | Supply voltage input | +2V to +5.5V operation; requires local 0.1µF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Programmable from 1.22V upward using two external resistors - eliminates need for fixed-threshold variants. |
| Guaranteed RESET at VCC ≥ 1V | Ensures deterministic reset assertion during deep brownout - critical for fail-safe shutdown in medical devices. |
| 500× watchdog timeout multiplier | Enables single capacitor to support both fast-loop monitoring (ms) and wake-up timer functions (seconds). |
| Power-supply transient immunity | Rejects negative-going VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in noisy environments. |
| Watchdog disable capability | WDI left floating or three-stated in extended mode disables watchdog - simplifies firmware development phases. |
Applications
| Medical Infusion Pumps | Portable ECG Monitors |
|---|---|
Use Scenario: Battery-powered infusion pump operating from 3.6V Li-ion with voltage decay to 2.8V during discharge. IC Role / Device Role / Timing Role: Active-low push-pull reset supervisor asserting RESET when VIN drops below 3.0V, holding reset for 4ms after recovery. Use Value: Prevents motor control MCU from executing erratic commands during undervoltage - meets IEC 60601-1 safety requirement for controlled shutdown. |
Use Scenario: Handheld ECG device with ultra-low-power sleep mode between patient measurements. IC Role / Device Role / Timing Role: Wake-up timer using extended watchdog mode (WDS = VCC) to generate periodic 2.0s reset pulses that awaken the µP from deep sleep. Use Value: Reduces average system current to <10µA while maintaining responsive measurement readiness - extends 200mAh battery life to >72 hours. |
| Industrial PLC I/O Modules | Battery-Backed Smart Meters |
Use Scenario: DIN-rail mounted PLC module exposed to 12V DC field bus with ±10% ripple and transient spikes. IC Role / Device Role / Timing Role: Reset supervisor monitoring 5V LDO output, rejecting transients ≤40µs while asserting reset on sustained brownout. Use Value: Eliminates need for external RC filter or TVS diode on reset line - reduces BOM count and board area by 3 components. |
Use Scenario: AMI smart meter with RTC and flash memory retaining data during AC mains failure using backup supercapacitor. IC Role / Device Role / Timing Role: Supervises 3.3V backup rail; asserts RESET before VCC falls below 2.7V to initiate graceful flash write and RTC save. Use Value: Guarantees data integrity during power loss events - satisfies ANSI C12.1 and DLMS/COSEM certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6303CSA+ | Same electrical specs, SO-8 package - 5.0mm × 4.0mm surface-mount footprint vs. PDIP's 9.27mm × 6.35mm. | Preferred for space-constrained PCBs; requires reflow soldering instead of through-hole assembly. | Select MAX6303CSA+ when board real estate is limited and automated SMT assembly is available. |
| TPS3808G01DBVR | Fixed 1.0V reset threshold, 3.8µA ICC, open-drain output - lacks adjustable threshold and push-pull drive. | Suitable only where fixed threshold suffices; cannot replace MAX6303CPA+ in designs requiring >1.22V trip points. | Choose TPS3808G01DBVR only if reset voltage is fixed at 1.0V and open-drain interface is acceptable. |
Compared with MAX6303CSA+, the MAX6303CPA+ offers identical supervision functionality in through-hole form for prototyping and legacy manufacturing; compared with TPS3808G01DBVR, it provides design flexibility via adjustable threshold and robust push-pull output - essential for noise-immune reset signaling in industrial environments.
Availability
MAX6303CPA+ is available at Aetrix Electronics and suitable for medical equipment, portable instrumentation, and industrial embedded controllers requiring stable component supply across extended product lifecycles.
Supply support for MAX6303CPA+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX6301–MAX6304 family was engineered specifically for low-power microprocessor supervision in battery-critical and safety-relevant systems, emphasizing adjustability, transient immunity, and guaranteed low-voltage operation.
FAQ
What is the minimum VCC required for guaranteed RESET assertion in MAX6303CPA+?
The MAX6303CPA+ guarantees RESET assertion at VCC ≥ 1V, as specified in the Electrical Characteristics table under "Guaranteed RESET Asserted At or Above VCC = 1V". This ensures fail-safe behavior during deep brownout conditions where other supervisors may release reset prematurely. Below 1V, RESET output drive strength degrades, but the MAX6303CPA+ remains functional down to VCC = 0V with external pulldown support per Figure 9.
Can MAX6303CPA+ monitor voltages other than VCC?
Yes, the MAX6303CPA+ can monitor any DC voltage via the RESET IN pin using an external resistor divider, as shown in Figure 4. The reset threshold VRST is calculated as 1.22 × (R1 + R2)/R2, allowing precise trip points for 3.3V, 2.5V, or custom rails. Input leakage is ±1nA, so high-value resistors (e.g., 1MΩ/1MΩ) minimize loading without compromising accuracy.
How does the 500× watchdog timeout multiplier work in MAX6303CPA+?
In MAX6303CPA+, connecting WDS to VCC activates extended watchdog mode, multiplying the base timeout (set by CSWT) by exactly 500×. For example, a 1500pF capacitor yields 2.8–5.2ms in normal mode and 1.4–2.6s in extended mode. This is implemented via internal counter scaling - not capacitor multiplication - enabling long-interval supervision without large physical capacitors.
Is MAX6303CPA+ pin-compatible with other parts in the MAX6301–MAX6304 family?
Yes, all MAX6301–MAX6304 variants share identical 8-pin PDIP/SO/µMAX pinouts and pin functions. The MAX6303CPA+ differs only in output configuration (active-low push-pull RESET) and temperature grade (0°C to +70°C), making it a direct replacement for MAX6301CPA+ or MAX6302CPA+ in circuits requiring that specific output type - no PCB changes are needed.
What capacitor type is recommended for SRT and SWT on MAX6303CPA+?
Ceramic capacitors are recommended for both SRT and SWT pins due to their low leakage (<10nA) and stability over temperature. X7R or C0G dielectrics are preferred; avoid electrolytic or tantalum types, which exhibit higher leakage and voltage coefficient errors. Typical values range from 100pF to 10nF, corresponding to reset/watchdog timeouts from ~0.3ms to ~30s.
MAX6303CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 2.8ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX6303CPA+ FAQ
1.How can I place an order for MAX6303CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6303CPA+ 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 MAX6303CPA+ reliable?
The price and inventory of MAX6303CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6303CPA+ is usually 5 days.
3.What payment methods are accepted for MAX6303CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6303CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6303CPA+?
MAX6303CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6303CPA+ 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 MAX6303CPA+?
For technical support, including MAX6303CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6303CPA+ requirements.
6.How does Aetrix verify that MAX6303CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX6303CPA+ 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 MAX6303CPA+ meets industry standards.
7.What is the process for return or replacement of MAX6303CPA+?
All MAX6303CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6303CPA+, 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 MAX6303CPA+ part is unused and in its original packaging.
Return procedure for MAX6303CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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