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Analog Devices Inc./Maxim Integrated MAX6303ESA
- Part No.:
- MAX6303ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6303ESA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,487
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Product details
Overview
MAX6303ESA from Maxim Integrated is an active-low, push-pull reset supervisory IC for +5V microprocessor systems. It provides adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2ms with 1500pF), and adjustable watchdog timeout (2.8–5.2ms normal / 1.4–2.6s extended mode), with 4µA supply current and guaranteed RESET assertion down to VCC = 1V. It is used in battery-powered medical instruments requiring reliable brownout detection and software hang recovery.
For engineers reviewing the MAX6303ESA datasheet, MAX6303ESA pinout, MAX6303ESA application, or MAX6303ESA equivalent, key selection criteria include its push-pull active-low reset output, -40°C to +85°C industrial temperature range, SO-8 package, 500× watchdog timeout multiplier via WDS pin, and immunity to power-supply transients up to 100mV/50µs.
Technical Context
The MAX6303ESA implements a precision bandgap reference (1.22V) feeding a comparator that monitors voltage at RESET IN via external resistor divider. Its reset timeout is generated by a 500nA current source charging CSRT, while watchdog timing uses an identical current source on SWT - both scalable via capacitor value.
Watchdog operation supports two modes: normal (WDS = GND) with µs-range timeout, and extended (WDS = VCC) with 500× multiplication yielding second-range timeout. The WDI input accepts ≥30ns pulses and clears the timer on any transition; reset assertion forces watchdog clear and restarts timing upon deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - operates across full 5V system rail tolerance and supports brownout monitoring down to 2V. |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable medical and IoT edge devices. |
| Reset Threshold Accuracy | ±25mV at 1.22V - ensures precise voltage monitoring with minimal external component drift impact. |
| Reset Timeout (CSRT = 1500pF) | 4.0ms typical - provides sufficient delay for µP power stabilization before release from reset. |
| Watchdog Timeout (Normal) | 4.0ms typical (CSWT = 1500pF) - matches typical firmware service intervals in embedded control loops. |
| Watchdog Timeout (Extended) | 2.0s typical (CSWT = 1500pF, WDS = VCC) - enables long sleep cycles in low-power wake-up timer applications. |
| RESET Output Type | Push-pull, active-low - drives µP reset pin directly without external pull-up; sinks 3.2mA at VCC ≥ 4.5V. |
Pinout & Package
MAX6303ESA 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. |
| 2 - GND | Analog/digital ground reference | Common return for internal comparators, current sources, and output drivers; must be low-impedance. |
| 3 - SRT | Reset timeout capacitor connection | 500nA precision current source charges CSRT to generate tRP = 2.67 × CSRT (pF → µs). |
| 4 - SWT | Watchdog timeout capacitor connection | Identical 500nA current source charges CSWT; determines tWD before WDS scaling. |
| 5 - WDS | Watchdog mode select | Logic input: GND = normal mode (µs timeout), VCC = extended mode (500× timeout). |
| 6 - WDI | Watchdog trigger input | Edge-sensitive input; rising/falling transition within timeout period resets watchdog counter. |
| 7 - RESET | Active-low push-pull reset output | Drives µP reset pin low during fault; asserts within 63µs of VCC fall below threshold. |
| 8 - VCC | Positive supply input | Requires 0.1µF ceramic bypass capacitor placed adjacent to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable from 1.22V upward using two external resistors - supports custom brownout points for diverse supply rails. |
| 500× watchdog timeout multiplier | Single logic-level WDS pin selects extended mode - eliminates need for large timing capacitors in sleep/wake applications. |
| Power-supply transient immunity | Withstands ≤50µs negative transients down to 100mV below VRST - prevents false resets in noisy industrial environments. |
| Guaranteed RESET assertion at VCC ≥ 1V | Ensures valid reset signal during deep brownout - critical for deterministic µP behavior in failing power conditions. |
| Low-leakage timing inputs (SRT/SWT) | 500nA precision current sources require <10nA capacitor leakage - enables stable timing with standard X7R ceramics. |
Applications
| Medical Patient Monitor | Battery-Powered Data Logger |
|---|---|
Use Scenario: Continuous ECG waveform acquisition with periodic flash storage and BLE transmission. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output and triggers hard reset if supply dips below 3.0V or firmware hangs for >2s. Use Value: Prevents corrupted data writes during brownout and recovers unresponsive firmware without manual intervention. | Use Scenario: Remote environmental sensor node operating on coin-cell battery for 5+ years. IC Role / Device Role / Timing Role: Generates wake-up pulse every 30 seconds using extended-mode watchdog; holds µP in deep sleep between samples. Use Value: Reduces average system current to <1µA by eliminating RTC or external timer IC, extending battery life. |
| Industrial PLC I/O Module | Set-Top Box Power Sequencer |
Use Scenario: DIN-rail mounted controller monitoring 24V field bus and 5V logic supply. IC Role / Device Role / Timing Role: Monitors isolated 5V DC-DC converter output; asserts reset if voltage drops below 4.75V for >4ms. Use Value: Ensures deterministic boot state after line transients, preventing spurious relay actuation or communication loss. | Use Scenario: Consumer STB with multi-rail power (12V, 5V, 3.3V) requiring controlled startup order. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 5V rail; delays release of 3.3V µP reset until 5V stabilizes and watchdog is serviced. Use Value: Eliminates need for discrete RC timing networks and improves production yield via programmable reset window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6304ESA | Active-high push-pull RESET output; otherwise identical pinout, timing, and electrical specs. | Required when µP reset pin is active-high or shared with other active-high reset sources. | Select MAX6304ESA only when system-level reset polarity mandates active-high assertion. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no adjustable watchdog; 1.8µA ICC; SOT-23-6 package. | Lacks adjustable timing and dual-mode watchdog; suited for simple fixed-threshold monitoring without firmware supervision. | Choose TPS3808G33DBVR only for cost-sensitive, space-constrained designs where adjustable features are unnecessary. |
Compared with MAX6304ESA, MAX6303ESA provides identical timing flexibility but ensures compatibility with legacy active-low µP reset inputs; versus TPS3808G33DBVR, it trades fixed-threshold simplicity for full configurability in complex embedded systems requiring adaptive brownout and watchdog behavior.
Availability
MAX6303ESA is available at Aetrix Electronics and suitable for medical equipment, battery-powered data loggers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6303ESA 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX6301–MAX6304 family was designed specifically for low-power microprocessor supervision in space-constrained, battery-operated, and mission-critical systems requiring configurable reset and watchdog behavior.
FAQ
What is the operating temperature range for MAX6303ESA?
The MAX6303ESA is rated for operation from -40°C to +85°C, making it suitable for industrial and automotive-adjacent applications where ambient temperatures exceed commercial grade limits. This rating is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, and applies to all electrical specifications unless otherwise noted.
Does MAX6303ESA support adjustable reset threshold voltage?
Yes, MAX6303ESA supports fully adjustable reset threshold voltage starting at 1.22V, set via an external resistor divider on the RESET IN pin. The formula VRST = 1.22 × (R1 + R2)/R2 allows precise customization - for example, a 1MΩ R2 and 2.44MΩ R1 yields a 4.2V threshold. This capability is explicitly documented in the General Description, Pin Description, and Detailed Description sections.
How does the watchdog timeout work on MAX6303ESA?
MAX6303ESA offers dual-mode watchdog timeout: normal mode (WDS = GND) delivers µs-range timeout (e.g., 4ms with 1500pF), while extended mode (WDS = VCC) multiplies it by 500x (e.g., 2s). The WDI pin must receive a rising or falling edge within each timeout period to prevent reset assertion. This behavior is verified in the Watchdog Timer section and Typical Operating Characteristics graphs.
What output type does MAX6303ESA provide?
MAX6303ESA provides a push-pull, active-low RESET output (pin 7), capable of sinking 3.2mA at VCC ≥ 4.5V. This differs from MAX6301 (open-drain active-low) and MAX6302/MAX6304 (active-high variants). The output structure is confirmed in the Selector Guide, Pin Description, and Electrical Characteristics tables.
Can MAX6303ESA operate reliably during power-supply transients?
Yes, MAX6303ESA exhibits proven immunity to short-duration negative-going VCC transients - specifically, it typically avoids false reset assertion for transients ≤100mV in magnitude and ≤50µs in duration, as shown in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph. This robustness is highlighted in both the General Description and Applications Information sections.
MAX6303ESA 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6303ESA FAQ
1.How can I place an order for MAX6303ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6303ESA 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 MAX6303ESA reliable?
The price and inventory of MAX6303ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6303ESA is usually 5 days.
3.What payment methods are accepted for MAX6303ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6303ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6303ESA?
MAX6303ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6303ESA 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 MAX6303ESA?
For technical support, including MAX6303ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6303ESA requirements.
6.How does Aetrix verify that MAX6303ESA is sourced from the original manufacturer or authorized distributors?
All MAX6303ESA 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 MAX6303ESA meets industry standards.
7.What is the process for return or replacement of MAX6303ESA?
All MAX6303ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6303ESA, 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 MAX6303ESA part is unused and in its original packaging.
Return procedure for MAX6303ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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