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Analog Devices Inc./Maxim Integrated MAX6303ESA+T
- Part No.:
- MAX6303ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6303ESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,622
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Product details
Overview
MAX6303ESA+T from Maxim Integrated is an active-low, push-pull µP supervisory circuit designed for precise reset and watchdog monitoring in low-power embedded systems. It features adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2 ms with 1500pF), 4µA supply current, guaranteed RESET assertion down to VCC = 1V, and immunity to power-supply transients - used in battery-powered medical instruments and portable controllers.
For engineers reviewing the MAX6303ESA+T datasheet, MAX6303ESA+T pinout, MAX6303ESA+T application, or MAX6303ESA+T equivalent, key selection considerations include its push-pull active-low reset output, -40°C to +85°C industrial temperature range, SO-8 package, adjustable timing via external capacitors on SRT/SWT, and watchdog-select (WDS) pin enabling 500× timeout extension.
Technical Context
The MAX6303ESA+T implements a precision bandgap-based reset comparator with 1.22V internal reference, allowing external resistor divider programming of reset threshold voltage (VRST = 1.22 × (R1 + R2)/R2). Its reset timeout is generated by a 500nA current source charging CSRT, yielding tRP = 2.67 × CSRT (CSRT in pF, tRP in µs).
Watchdog timing uses the same 500nA current source on SWT, with WDS pin selecting between normal mode (tWD = 2.67 × CSWT) and extended mode (tWD × 500). The device guarantees RESET assertion at VCC ≥ 1V and provides transient immunity up to 50µs for 100mV overdrive below VRST.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - supports standard 3.3V and 5V rails with brownout detection down to 1V |
| Quiescent Current | 4.0µA typical - enables multi-year operation in coin-cell–powered portable equipment |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - ensures reliable reset assertion across temperature (-40°C to +85°C) |
| Reset Timeout (CSRT = 1500pF) | 2.8–5.2ms - programmable delay prevents premature µP release during power ramp-up |
| Watchdog Timeout (CSWT = 1500pF, WDS = GND) | 2.8–5.2ms - matches typical firmware service intervals without requiring fixed-timing ICs |
| Watchdog Timeout Multiplier | 500× (WDS = VCC) - extends timeout to ~2.0s for wake-up timer applications in sleep-mode systems |
| Output Type | Push-pull, active-low RESET - drives µP reset pin directly without external pull-up; sinks 3.2mA at VCC ≥ 4.5V |
Pinout & Package
MAX6303ESA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, RoHS-compliant and lead(Pb)-free, with 1.27mm pitch and 4.9mm × 3.9mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset threshold input | Connects to center tap of external R1/R2 divider; sets VRST = 1.22 × (R1 + R2)/R2 |
| 2 - GND | Ground reference | Common return for all internal circuits and external timing capacitors (SRT/SWT) |
| 3 - SRT | Reset timeout capacitor input | Sinks 500nA to ground; tRP = 2.67 × CSRT (pF → µs); requires low-leakage ceramic cap |
| 4 - SWT | Watchdog timeout capacitor input | Sinks 500nA to ground; tWD = 2.67 × CSWT (pF → µs); same leakage requirements as SRT |
| 5 - WDS | Watchdog mode select | GND = normal mode (ms timeout); VCC = extended mode (500× timeout); resets timer on transition |
| 6 - WDI | Watchdog input | Rising/falling edge clears watchdog timer; pulse width ≥30ns sufficient; high-Z in normal mode |
| 7 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; VOH = VCC − 0.4V (min), VOL = 0.4V (max @ 3.2mA sink) |
| 8 - VCC | Power supply input | Requires 0.1µF ceramic bypass capacitor placed adjacent to pin; operates down to 1V with guaranteed RESET |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Programmable above 1.22V using two external resistors - eliminates need for multiple fixed-threshold parts |
| Adjustable reset timeout | 2.8–5.2ms typical with 1500pF capacitor - matches µP initialization time without trimming |
| 500× watchdog timeout multiplier | Enables >2-second watchdog periods with sub-1µF capacitor - ideal for ultra-low-power wake-up timers |
| Power-supply transient immunity | Immune to 50µs negative transients ≤100mV below VRST - prevents spurious resets in noisy environments |
| Guaranteed RESET at VCC ≥ 1V | Ensures valid reset assertion during deep brownout - critical for fail-safe behavior in battery-backed systems |
Applications
| Medical Patient Monitor | Portable ECG Device |
|---|---|
|
Use Scenario: Continuous low-power monitoring of cardiac signals with periodic data transmission and sleep/wake cycles. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout protection, and programmable watchdog timeout to wake µP from deep sleep every 2 seconds. Use Value: Enables 5+ year battery life using MAX6303ESA+T's 4µA quiescent current and 500× watchdog extension - no external timing components required. |
Use Scenario: Handheld diagnostic tool powered by single Li-ion cell, operating across 4.2V–3.0V range with strict safety-critical reset behavior. IC Role / Device Role / Timing Role: Active-low push-pull reset generator with adjustable threshold set to 2.9V, ensuring µP reset before undervoltage lockout. Use Value: Guarantees RESET assertion down to VCC = 1V and rejects 50µs transients - meets IEC 60601-1 immunity requirements for patient-connected devices. |
| Industrial PLC Controller | Smart Energy Meter |
|
Use Scenario: DIN-rail mounted controller exposed to wide ambient temperatures (-40°C to +85°C) and conducted EMI. IC Role / Device Role / Timing Role: Reset supervisor with external RC timing on SRT/SWT pins, configured for 4ms reset delay and 4ms watchdog period. Use Value: SO-8 package withstands thermal cycling; ±25mV threshold accuracy ensures consistent reset point across full temperature range. |
Use Scenario: Revenue-grade meter with tamper detection, requiring secure boot and watchdog-enforced firmware integrity checks. IC Role / Device Role / Timing Role: Watchdog monitor interfaced to µP's I/O pin, with WDS driven by secure state machine to enable/disable extended timeout during calibration. Use Value: WDS pin allows dynamic watchdog configuration - disables timeout during trusted calibration sequences while maintaining protection during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6303CSA+ | Same functionality and pinout, but rated for 0°C to +70°C commercial temperature range | Not suitable for industrial or automotive environments requiring -40°C operation | Select MAX6303ESA+T for designs deployed in uncontrolled ambient conditions or outdoor enclosures |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no adjustable timeout; 1.6µA supply current; SOT-23-6 package | Lacks external timing capacitor support and watchdog extension - limited to simple reset-only use cases | Choose MAX6303ESA+T when adjustable threshold, programmable timeout, or 500× watchdog extension is required |
Compared with MAX6303CSA+, the MAX6303ESA+T adds industrial temperature support without changing footprint or function; compared with TPS3808G33DBVR, it trades lower quiescent current for full adjustability and extended watchdog capability - essential for adaptive power management.
Availability
MAX6303ESA+T is available at Aetrix Electronics and suitable for medical instrumentation, industrial PLCs, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6303ESA+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX6301–MAX6304 family was designed specifically for low-power µP supervision in space-constrained, battery-operated, and thermally demanding systems - emphasizing adjustability, reliability, and minimal quiescent current.
FAQ
What is the operating temperature range of the MAX6303ESA+T?
The MAX6303ESA+T is specified for operation from -40°C to +85°C, making it suitable for industrial and outdoor embedded applications. This rating is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The "E" suffix denotes the extended temperature grade, and the "SA" indicates the 8-pin SO package. All electrical characteristics in the datasheet are guaranteed across this full range.
Does the MAX6303ESA+T support adjustable reset threshold voltage?
Yes, the MAX6303ESA+T supports fully adjustable reset threshold voltage via an external resistor divider on the RESET IN pin. Using the formula VRST = 1.22 × (R1 + R2)/R2, designers can set the threshold to any value above 1.22V. Typical implementations use R2 = 1MΩ and calculate R1 accordingly - enabling precise brownout detection tailored to specific supply rails like 3.3V or 2.5V.
What is the function of the WDS pin on the MAX6303ESA+T?
The WDS (Watchdog Select) pin on the MAX6303ESA+T selects between normal and extended watchdog modes: grounding WDS enables normal mode (watchdog timeout = 2.67 × CSWT), while connecting WDS to VCC enables extended mode (timeout × 500). A logic transition on WDS also resets the watchdog timer. This pin is essential for implementing wake-up timers or dynamically disabling watchdog supervision during calibration sequences.
Can the MAX6303ESA+T be used with supply voltages below 2V?
Yes, the MAX6303ESA+T guarantees RESET assertion down to VCC = 1V, and its operating voltage range is specified from +2V to +5.5V. While functional operation begins at 2V, the reset output remains valid and asserted as VCC falls from 2V down to 1V - critical for detecting deep brownout conditions. Below 1V, RESET behavior is not guaranteed, though external pulldown resistors can maintain validity to 0V (as documented for MAX6303).
What package type and RoHS status does the MAX6303ESA+T have?
The MAX6303ESA+T uses an 8-pin SO (Small Outline) package per JEDEC MS-012 outline, with 4.9mm × 3.9mm body size and 1.27mm lead pitch. The "+" suffix explicitly denotes lead(Pb)-free and RoHS-compliant construction, as stated in the Ordering Information and Package Information sections. This package is compatible with standard reflow soldering profiles including Pb-free peak temperatures up to +260°C.
MAX6303ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6303ESA+T FAQ
1.How can I place an order for MAX6303ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6303ESA+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 MAX6303ESA+T reliable?
The price and inventory of MAX6303ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6303ESA+T is usually 5 days.
3.What payment methods are accepted for MAX6303ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6303ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6303ESA+T?
MAX6303ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6303ESA+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 MAX6303ESA+T?
For technical support, including MAX6303ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6303ESA+T requirements.
6.How does Aetrix verify that MAX6303ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX6303ESA+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 MAX6303ESA+T meets industry standards.
7.What is the process for return or replacement of MAX6303ESA+T?
All MAX6303ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6303ESA+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 MAX6303ESA+T part is unused and in its original packaging.
Return procedure for MAX6303ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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