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Analog Devices Inc./Maxim Integrated MAX6303CUA-T
- Part No.:
- MAX6303CUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6303CUA-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6303CUA-T from Maxim Integrated is a low-power, +5V microprocessor supervisory circuit with active-low push-pull reset output, adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2 ms typical), and dual-mode watchdog timer (normal/extended). It monitors VCC or external supply rails in battery-powered embedded controllers and medical equipment requiring reliable brownout detection and software hang protection.
For engineers reviewing the MAX6303CUA-T datasheet, MAX6303CUA-T pinout, MAX6303CUA-T application, or MAX6303CUA-T equivalent, this page delivers verified electrical parameters, µMAX-8 package mapping, functional pin roles, real-world use cases for portable instrumentation, and two validated alternative parts with documented timing and output logic differences.
Technical Context
The MAX6303CUA-T implements a precision 1.22V internal reference to set reset thresholds via external resistor dividers, with ±20mV hysteresis and guaranteed reset assertion down to VCC = 1V. Its reset timeout is controlled by a 500nA current source charging CSRT, yielding 2.8–5.2ms at 1500pF.
Watchdog operation uses identical 500nA timing current on SWT, supporting normal mode (2.8–5.2ms timeout) or extended mode (500× multiplier, up to 2.6s at 1500pF) selected by WDS pin state. WDI accepts ≥30ns pulses and clears the timer on any edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - supports standard 3.3V/5V systems and brownout detection down to 2V |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable medical devices |
| Reset Threshold Accuracy | 1.220V ±25mV at +25°C - sets precise power-fail detection point via R1/R2 divider |
| Reset Timeout (CSRT=1500pF) | 4.0ms typical - ensures µP completes power-up initialization before release |
| Watchdog Timeout (CSWT=1500pF, WDS=GND) | 4.0ms typical - matches short firmware loops in real-time embedded control |
| Watchdog Timeout (CSWT=1500pF, WDS=VCC) | 2.0s typical - enables long sleep intervals in wake-up timer applications |
| Output Type | Push-pull, active-low RESET - drives µP reset pin directly without external pull-up |
Pinout & Package
MAX6303CUA-T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise convention from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Reset threshold reference input | High-impedance node for external resistor divider; sets VRST = 1.22 × (R1+R2)/R2 |
| 2 - GND | Analog/digital ground reference | Common return for all internal circuits; must be low-impedance connection to system ground plane |
| 3 - SRT | Reset timeout capacitor connection | Sinks 500nA to ground; CSRT value directly sets tRP = 2.67 × CSRT (pF → µs) |
| 4 - SWT | Watchdog timeout capacitor connection | Sinks 500nA to ground; CSWT value sets basic tWD = 2.67 × CSWT (pF → µs) |
| 5 - WDS | Watchdog mode select input | Logic high selects 500× extended timeout; logic low selects normal timeout; edge-triggered reset |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising/falling transition within tWD resets watchdog timer |
| 7 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; VOH = VCC−0.4V, VOL = 0.4V @ 3.2mA sink |
| 8 - VCC | Positive supply input | Requires 0.1µF ceramic bypass capacitor placed adjacent to pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable from 1.22V to >5.5V using external resistors - enables monitoring of diverse supply rails |
| Guaranteed reset assertion at VCC ≥1V | Ensures valid reset signal during deep brownout - critical for fail-safe shutdown in medical instruments |
| 500× watchdog timeout multiplier | WDS pin toggles between 4ms and 2s timeout - eliminates need for large timing capacitors in sleep-mode designs |
| Power-supply transient immunity | Rejects ≤50µs negative transients down to 100mV below VRST - prevents spurious resets in noisy industrial environments |
| Low-leakage timing inputs (SRT/SWT) | 500nA precision current sources - enable accurate timeout periods with ceramic capacitors (no electrolytic required) |
Applications
| Medical Patient Monitor | Battery-Powered Data Logger |
|---|---|
Use Scenario: Continuous ECG waveform acquisition powered by coin-cell battery with ultra-low quiescent current budget. IC Role / Device Role / Timing Role: Supervises main 3.3V rail; asserts RESET if voltage drops below 2.9V during battery depletion; provides 4ms watchdog timeout to detect firmware lockup. Use Value: Prevents corrupted data storage during brownout and ensures automatic recovery from software hangs without manual intervention. | Use Scenario: Environmental sensor node sampling temperature/humidity every 10 minutes, then returning to deep sleep. IC Role / Device Role / Timing Role: Acts as wake-up timer: µC pulls WDS high before sleep, enabling 2s extended watchdog timeout; timeout triggers RESET to wake µC. Use Value: Eliminates need for separate RTC or timer IC, reducing BOM count and PCB area while maintaining precise wake interval. |
| Industrial PLC I/O Module | Portable Diagnostic Handheld |
Use Scenario: DIN-rail mounted controller with isolated 24V-to-5V DC/DC converter powering µP and analog front-end. IC Role / Device Role / Timing Role: Monitors 5V output rail; uses RESET IN tied to DC/DC feedback node to detect regulation failure; provides 4ms reset timeout. Use Value: Detects secondary-side faults faster than primary-side supervision alone, improving system-level safety compliance. | Use Scenario: Handheld ultrasound probe with lithium-polymer battery and ARM Cortex-M4 processor. IC Role / Device Role / Timing Role: Provides active-low push-pull RESET output directly driving µP reset pin; guarantees reset assertion until VCC ≥1V during hot-swap battery insertion. Use Value: Ensures deterministic boot sequence even during rapid battery replacement, preventing undefined processor state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302CUA-T | Active-high, open-drain RESET output; same timing, threshold, and package | Requires external pull-up resistor; incompatible with µPs needing active-low drive | Select when interfacing with processors requiring active-high reset assertion and board space allows pull-up |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; 200ms min timeout; 2.5µA ICC; SOT-23-6 package | Lacks adjustable threshold/watchdog; smaller footprint but no extended-mode capability | Select for cost-sensitive, fixed-threshold applications where 200ms reset delay suffices and watchdog not required |
Compared with MAX6302CUA-T, the MAX6303CUA-T provides direct push-pull drive eliminating external components, while TPS3808G12DBVR trades adjustability for lower cost and smaller size - choice depends on whether programmable timing and rail flexibility outweigh footprint savings.
Availability
MAX6303CUA-T is available at Aetrix Electronics and suitable for medical patient monitors, battery-powered data loggers, and industrial PLC I/O modules requiring stable component supply across extended production lifecycles.
Supply support for MAX6303CUA-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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing low power, high reliability, and integration.
The MAX6301–MAX6304 family targets embedded systems requiring configurable reset and watchdog functions with minimal quiescent current - optimized for portable, battery-critical, and safety-conscious applications.
FAQ
What is the minimum VCC required for guaranteed RESET assertion in MAX6303CUA-T?
The MAX6303CUA-T guarantees RESET is asserted (low) for VCC ≥ 1V. Below 1V, output drive strength degrades; for applications requiring valid reset down to 0V, a 100kΩ pulldown resistor on the RESET pin is recommended. This behavior is confirmed in the Electrical Characteristics table under "Guaranteed RESET Asserted At or Above VCC = 1V" for MAX6303.
How do I calculate the resistor values for a 3.3V reset threshold using MAX6303CUA-T?
Use VRST = 1.22 × (R1 + R2)/R2. For VRST = 3.3V and R2 = 1MΩ, solve: 3.3 = 1.22 × (R1 + 1M)/1M → R1 ≈ 1.71MΩ. Standard 1% values: R2 = 1.00MΩ, R1 = 1.74MΩ. The MAX6303CUA-T's high-impedance RESET IN input allows megaohm-scale resistors without loading error.
Can the watchdog function be disabled on MAX6303CUA-T, and how?
Yes - in extended mode (WDS = VCC), the watchdog can be disabled by leaving WDI unconnected or three-stating its driver. The internal circuitry pulses WDI high at ~94% of timeout, clearing the timer. In normal mode (WDS = GND), WDI must be actively toggled; disabling is not supported. This is explicitly stated in the Detailed Description section.
What capacitor type is recommended for SRT and SWT pins on MAX6303CUA-T?
Ceramic capacitors are recommended for both SRT and SWT due to their low leakage (<10nA) and stability. The datasheet specifies CSRT/CSWT must be low-leakage types to prevent timing errors from the 500nA precision current sources. X7R or C0G dielectrics are preferred; electrolytic or tantalum capacitors are unsuitable due to higher leakage.
Does MAX6303CUA-T support monitoring voltages other than VCC?
Yes - the RESET IN pin accepts any external voltage rail (e.g., 1.8V, 3.3V, analog supply) via a resistor divider. The MAX6303CUA-T does not monitor VCC directly; it monitors the voltage applied to RESET IN. Figure 4 in the datasheet shows explicit examples of monitoring non-VCC rails, confirming this capability for all MAX6301–MAX6304 variants.
MAX6303CUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX6303CUA-T FAQ
1.How can I place an order for MAX6303CUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6303CUA-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 MAX6303CUA-T reliable?
The price and inventory of MAX6303CUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6303CUA-T is usually 5 days.
3.What payment methods are accepted for MAX6303CUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6303CUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6303CUA-T?
MAX6303CUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6303CUA-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 MAX6303CUA-T?
For technical support, including MAX6303CUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6303CUA-T requirements.
6.How does Aetrix verify that MAX6303CUA-T is sourced from the original manufacturer or authorized distributors?
All MAX6303CUA-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 MAX6303CUA-T meets industry standards.
7.What is the process for return or replacement of MAX6303CUA-T?
All MAX6303CUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6303CUA-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 MAX6303CUA-T part is unused and in its original packaging.
Return procedure for MAX6303CUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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