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Analog Devices Inc./Maxim Integrated MAX6303CSA
- Part No.:
- MAX6303CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6303CSA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
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Product details
Overview
MAX6303CSA from Maxim Integrated is an active-low, push-pull microprocessor supervisory circuit for +5V 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), 500× watchdog multiplier, and 4µA supply current. It ensures reliable µP reset during power-up, brownout, and software hang conditions in portable and embedded controllers.
For engineers reviewing the MAX6303CSA datasheet, MAX6303CSA pinout, MAX6303CSA application, or MAX6303CSA equivalent, this page delivers verified functional identity, SO-8 package mapping, confirmed push-pull active-low reset output, precise timing capacitor dependencies (SRT/SWT), and validated alternatives for reset supervision in low-power 5V systems.
Technical Context
The MAX6303CSA implements a precision bandgap-based reset comparator with 1.22V internal reference, enabling externally adjustable reset thresholds via resistor dividers on RESET IN. Its dual-capacitor timing architecture uses SRT for reset timeout and SWT for watchdog timeout, both sourcing 500nA precision currents.
Watchdog operation supports two modes: normal (WDS = GND) with µs-range timeout, and extended (WDS = VCC) with 500× multiplication yielding second-range timeout. The push-pull RESET output guarantees logic-low assertion down to VCC = 1V and provides 0.4V max VOL at 3.2mA sink, eliminating external pull-up requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-low, push-pull - drives low without external pull-up; compatible with standard µP reset inputs requiring asserted-low signal. |
| Supply Current | 4.0µA typical - enables multi-year battery life in portable equipment and always-on monitoring applications. |
| Reset Threshold Range | ≥1.22V adjustable - set via external R1/R2 divider; supports monitoring of 3.3V, 5V, or custom rails with ±20mV hysteresis. |
| Reset Timeout (tRP) | 2.8–5.2ms with 1500pF on SRT - programmable delay prevents premature µP release before power stabilization. |
| Watchdog Timeout (tWD) | 2.8–5.2ms (normal) or 1.4–2.6s (extended with WDS=VCC) - configurable supervision window aligns with firmware execution cycles. |
| Operating Voltage | +2V to +5.5V - functions across full 5V system range and supports brownout detection down to 2V. |
| Power-Supply Transient Immunity | Validated against ≤50µs, 100mV VCC glitches - suppresses false resets caused by switching noise or load transients. |
Pinout & Package
MAX6303CSA is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot.
| 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; leakage <±1nA avoids threshold error. |
| 2 GND | Ground reference | Primary return path for internal comparators, timers, and output driver; must connect to clean system ground plane. |
| 3 SRT | Reset timeout capacitor terminal | Sources 500nA to CSRT; tRP = 2.67 × CSRT (pF → µs); requires low-leakage ceramic capacitor. |
| 4 SWT | Watchdog timeout capacitor terminal | Sources 500nA to CSWT; tWD = 2.67 × CSWT (pF → µs); same capacitor type requirement as SRT. |
| 5 WDS | Watchdog mode select | Logic-high (VCC) enables 500× timeout extension; logic-low (GND) selects normal mode; transition resets watchdog timer. |
| 6 WDI | Watchdog input | Edge-sensitive input; rising/falling transition within tWD clears timer; 30ns minimum pulse width supported. |
| 7 RESET | Active-low push-pull reset output | Drives low (≤0.4V @ 3.2mA) to assert µP reset; drives high (≥VCC–0.4V) to release; no pull-up needed. |
| 8 VCC | Supply voltage input | +2V to +5.5V operation; requires local 0.1µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Set to any voltage ≥1.22V using two external resistors - eliminates need for fixed-threshold parts across diverse supply rails. |
| 500× watchdog timeout multiplier | Extends basic timeout from ms to seconds via WDS pin - enables ultra-low-power sleep/wake cycles without firmware modification. |
| Guaranteed RESET assertion at VCC ≥1V | Ensures valid reset signal even during deep brownout - prevents µP from executing corrupted code below safe operating voltage. |
| Power-supply transient immunity | Rejects ≤50µs, 100mV negative-going VCC glitches - improves system robustness in electrically noisy environments like motor control or industrial I/O. |
| Push-pull RESET output | Eliminates external pull-up resistor - reduces BOM count, PCB area, and leakage path; simplifies interface to bidirectional µP reset pins. |
Applications
| Medical Vital Signs Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered handheld device continuously measuring ECG/SpO₂ with periodic deep-sleep cycles to extend runtime. IC Role / Device Role / Timing Role: MAX6303CSA monitors main 3.3V rail and asserts RESET if voltage drops below 2.93V; its extended-mode watchdog wakes µP every 2.2s to sample sensors and transmit data. Use Value: 4µA quiescent current + programmable long watchdog interval enables >3-year battery life; push-pull output ensures reliable reset without pull-up loading the low-power rail. | Use Scenario: DIN-rail mounted controller operating in factory environment with 24VDC input and frequent 5V rail transients from relay switching. IC Role / Device Role / Timing Role: MAX6303CSA supervises 5V logic supply, rejecting 40µs/80mV transients while asserting RESET during sustained brownout below 4.65V. Use Value: Transient immunity prevents spurious resets; adjustable threshold accommodates aging power supply drift; SO-8 package suits compact industrial PCB layouts. |
| Smart Energy Meter | Point-of-Sale Terminal |
Use Scenario: Revenue-grade meter with tamper detection, requiring secure boot and watchdog supervision of metrology firmware. IC Role / Device Role / Timing Role: MAX6303CSA provides hardware-enforced reset during power-up and monitors µP activity via WDI; reset timeout set to 4ms ensures stable clock before firmware execution. Use Value: Guaranteed RESET assertion at VCC ≥1V prevents partial initialization; adjustable threshold allows precise match to 5V LDO tolerance (±2%). | Use Scenario: Retail terminal with barcode scanner, display, and payment interface - must recover instantly from software lockup without user intervention. IC Role / Device Role / Timing Role: MAX6303CSA's normal-mode watchdog (4ms timeout) detects frozen UI thread; RESET output directly drives µP reset pin with 0.4V max VOL for guaranteed logic-low recognition. Use Value: Push-pull drive eliminates reliance on µP's internal weak pull-up; fast 63µs VCC-to-RESET delay ensures immediate response to supply collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302CSA | Active-high, open-drain RESET output; identical timing, threshold, and supply specs. | Requires external pull-up resistor; used where µP reset pin is active-high or shared with other open-drain sources. | Select when system-level reset signaling mandates active-high polarity or wired-OR configuration. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; 2.5µA ICC; 200ms min reset timeout; no adjustable watchdog. | Lacks capacitor-programmable timing; suited for simple power-on reset only, not software hang detection. | Choose for cost-sensitive, non-watchdog applications where fixed threshold suffices and layout space is constrained. |
Compared with MAX6302CSA, MAX6303CSA offers active-low push-pull drive eliminating external components; compared with TPS3808G125DBVR, it provides full adjustability of both reset and watchdog timing - critical for firmware-defined supervision windows and multi-rail systems.
Availability
MAX6303CSA is available at Aetrix Electronics and suitable for medical instrumentation, industrial PLCs, smart energy meters, and point-of-sale terminals requiring stable component supply across extended production lifecycles.
Supply support for MAX6303CSA 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 demanding industrial, medical, and communications applications.
The MAX6301–MAX6304 family was engineered specifically for low-power microprocessor supervision in battery-operated and noise-prone systems, emphasizing adjustable timing, ultra-low ICC, and robust transient immunity.
FAQ
What is the function of the WDS pin on the MAX6303CSA?
The WDS pin on the MAX6303CSA selects watchdog timer mode: logic-low (GND) enables normal mode with µs-range timeout; logic-high (VCC) activates extended mode, multiplying the timeout by 500× to yield second-range supervision. A state change on WDS resets the watchdog counter to zero, ensuring deterministic restart behavior. This dual-mode capability is integral to the MAX6303CSA's design for flexible firmware supervision.
Can the MAX6303CSA monitor a 3.3V supply rail?
Yes, the MAX6303CSA can monitor a 3.3V rail by configuring the external resistor divider on RESET IN to set VRST = 3.3V. Using the formula VRST = 1.22 × (R1 + R2)/R2, selecting R2 = 1MΩ yields R1 ≈ 1.71MΩ. The MAX6303CSA's 1.22V internal reference and ±20mV hysteresis ensure accurate, stable threshold detection across temperature, making it fully suitable for 3.3V system supervision.
Does the MAX6303CSA require an external pull-up resistor on the RESET pin?
No, the MAX6303CSA does not require an external pull-up resistor on the RESET pin because it features a push-pull output stage. The RESET pin actively drives high (≥VCC–0.4V) and low (≤0.4V at 3.2mA), providing full logic-level compliance without external components. This distinguishes the MAX6303CSA from open-drain variants like MAX6301CSA and simplifies design integration in the MAX6303CSA application.
What is the minimum VCC required for guaranteed RESET assertion in the MAX6303CSA?
The MAX6303CSA guarantees RESET assertion (logic-low output) for VCC ≥ 1V, as specified in the Electrical Characteristics table under "Guaranteed RESET Asserted At or Above 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 per the datasheet's Figure 9 - a key reliability consideration in the MAX6303CSA design.
How do I calculate the capacitor value for a 100ms watchdog timeout in extended mode on the MAX6303CSA?
In extended mode (WDS = VCC), the MAX6303CSA's watchdog timeout is 500× the base period. To achieve 100ms total, first compute the base timeout: 100ms ÷ 500 = 200µs. Then use tWD = 2.67 × CSWT → CSWT = 200µs ÷ 2.67 ≈ 75pF. Use a low-leakage ceramic capacitor (≤10nA) at SWT. This calculation is validated in the MAX6303CSA Typical Operating Characteristics graph "EXTENDED-MODE WATCHDOG TIMEOUT PERIOD vs. CSWT".
MAX6303CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6303CSA FAQ
1.How can I place an order for MAX6303CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6303CSA 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 MAX6303CSA reliable?
The price and inventory of MAX6303CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6303CSA is usually 5 days.
3.What payment methods are accepted for MAX6303CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6303CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6303CSA?
MAX6303CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6303CSA 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 MAX6303CSA?
For technical support, including MAX6303CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6303CSA requirements.
6.How does Aetrix verify that MAX6303CSA is sourced from the original manufacturer or authorized distributors?
All MAX6303CSA 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 MAX6303CSA meets industry standards.
7.What is the process for return or replacement of MAX6303CSA?
All MAX6303CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6303CSA, 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 MAX6303CSA part is unused and in its original packaging.
Return procedure for MAX6303CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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