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Analog Devices Inc./Maxim Integrated MAX6303EPA+
- Part No.:
- MAX6303EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6303EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
MAX6303EPA+ from Maxim Integrated is a low-power, adjustable-reset/adjustable-watchdog microprocessor supervisory circuit in an 8-pin PDIP package, featuring active-low push-pull RESET output, 4µA supply current, guaranteed reset assertion down to VCC = 1V, and ±1nA reset input leakage. It monitors power rails in battery-powered embedded controllers and medical equipment requiring precise brownout detection and software hang protection.
For engineers reviewing the MAX6303EPA+ datasheet, MAX6303EPA+ pinout, MAX6303EPA+ application, or MAX6303EPA+ equivalent, this page delivers verified functional identity, temperature-rated electrical behavior (–40°C to +85°C), reset threshold adjustability via external resistors, watchdog timeout scaling up to 500× via WDS control, and real-world timing capacitor design guidance for tRP and tWD.
Technical Context
The MAX6303EPA+ implements a precision 1.22V internal reference with ±25mV hysteresis to drive an adjustable reset comparator whose threshold (VRST) is set externally using R1/R2. Its reset timeout (tRP) and watchdog timeout (tWD) are independently configured via capacitors on SRT and SWT pins, each sourcing a stable 500nA current for predictable µs- to second-scale delays.
Watchdog operation supports two modes: normal (WDS = GND, tWD in ms) and extended (WDS = VCC, tWD × 500, up to ~22 minutes with 1µF). The push-pull RESET output drives high after tRP following VIN recovery, while WDI accepts sub-30ns transitions and exhibits <100pA leakage in normal mode-critical for ultra-low-power sleep/wake cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 4.0µA typical at +25°C - enables multi-year battery life in portable medical sensors and remote IoT nodes. |
| Operating Voltage Range | 1.20V to 5.50V - supports direct monitoring of 1.8V, 3.3V, and 5V rails without level-shifting. |
| Reset Input Threshold | 1.220V ±25mV - sets minimum detectable undervoltage; VRST = 1.22 × (R1 + R2)/R2 allows custom thresholds ≥1.22V. |
| Reset Timeout Period | 2.8ms to 5.2ms (CSRT = 1500pF) - ensures µP initialization completes before firmware execution begins. |
| Watchdog Timeout (Extended) | 1.4s to 2.6s × 500 = 700s to 1300s - provides long-duration wake-up intervals for deep-sleep microcontroller applications. |
| RESET Output Type | Push-pull, active-low - eliminates external pull-up resistor, reduces BOM count, and ensures clean logic-level drive into µP reset pin. |
| Temperature Range | –40°C to +85°C - qualified for industrial and automotive-adjacent environments including engine bay proximity and outdoor medical enclosures. |
Pinout & Package
MAX6303EPA+ is housed in an 8-pin plastic dual in-line package (PDIP), 0.300" wide, RoHS-compliant with lead-free finish (indicated by '+' suffix). Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise layout from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET IN | High-impedance reset threshold input | Connects to center tap of R1/R2 divider; sets VRST = 1.22 × (R1 + R2)/R2; ±1nA leakage avoids threshold drift. |
| 2 GND | Analog and digital ground reference | Common return for internal reference, comparators, and output stage; must be low-impedance connection to system ground plane. |
| 3 SRT | Reset timeout capacitor node | Sources 500nA to CSRT; tRP = 2.67 × CSRT (pF) in µs - determines duration RESET stays low after voltage recovery. |
| 4 SWT | Watchdog timeout capacitor node | Sources 500nA to CSWT; tWD = 2.67 × CSWT (pF) in µs - defines basic watchdog window before WDS scaling. |
| 5 WDS | Watchdog mode select input | Logic-high selects 500× extended timeout; logic-low selects normal timeout; transition resets watchdog timer. |
| 6 WDI | Watchdog input trigger | Rising/falling edge clears watchdog timer; <30ns pulse width sufficient; <100pA leakage in normal mode preserves battery. |
| 7 RESET | Active-low push-pull reset output | Drives µP reset pin directly; VOH = VCC – 0.4V @ 0.8mA, VOL = 0.3V @ 100µA - compatible with 1.2V–5.5V logic families. |
| 8 VCC | Power supply input | Requires 0.1µF ceramic bypass capacitor placed adjacent to pin; operates down to 1.20V with guaranteed reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable above 1.22V using two external resistors - enables precise brownout detection across diverse supply rails. |
| 500× watchdog timeout multiplier | Extends tWD from milliseconds to >1000 seconds - supports ultra-low-duty-cycle wake-up timers in energy-harvesting systems. |
| Guaranteed RESET assertion at VCC ≥ 1V | Ensures reliable reset during deep brownout - critical for fail-safe shutdown in battery-backed memory and safety-critical controllers. |
| Power-supply transient immunity | Rejects negative-going VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in electrically noisy industrial environments. |
| Push-pull RESET output | Eliminates need for external pull-up resistor - reduces component count, PCB area, and potential noise coupling on reset line. |
Applications
| Medical Vital Sign Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Portable ECG device powered by single Li-ion cell, operating across 4.2V (fully charged) to 2.8V (low-battery cutoff). IC Role / Device Role / Timing Role: MAX6303EPA+ monitors battery voltage via resistor divider on RESET IN; asserts RESET when voltage drops below 2.9V; holds reset for 4ms (CSRT = 1500pF) to ensure ADC and Bluetooth SoC fully power-down. Use Value: Prevents corrupted ECG waveform capture during brownout by guaranteeing clean hardware reset before firmware restart - meets IEC 60601-1 safety requirements for patient-connected devices. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V DC input powering field I/O circuits and ARM-based controller. IC Role / Device Role / Timing Role: MAX6303EPA+ supervises 3.3V controller rail; WDS tied to GPIO to enable extended watchdog mode during sleep; WDI toggled by firmware every 15 seconds. Use Value: Enables 2-hour sleep-wake cycle (tWD × 500 ≈ 7200s) while maintaining full watchdog coverage - extends runtime without compromising fault detection integrity. |
| Battery-Powered Smart Meter | Automotive Telematics Gateway |
Use Scenario: AMI smart meter with supercapacitor backup, operating intermittently to transmit consumption data via NB-IoT. IC Role / Device Role / Timing Role: MAX6303EPA+ monitors 3.3V rail derived from supercap; uses manual reset switch (parallel to R2) for field technician calibration reset; RESET drives microcontroller reset and RF transceiver enable. Use Value: Combines adjustable threshold, debounced manual reset, and ultra-low ICC (4µA) to achieve >15-year supercap lifetime - exceeds ANSI C12.20 accuracy and longevity mandates. |
Use Scenario: CAN-based telematics unit installed in vehicle cabin, exposed to –40°C cold cranking and 85°C under-hood thermal soak. IC Role / Device Role / Timing Role: MAX6303EPA+ supervises 5V domain powering MCU and cellular modem; operates across full –40°C to +85°C range; RESET output synchronized to power-good signal from PMIC. Use Value: Guaranteed functionality across automotive temperature extremes with no derating - satisfies AEC-Q100 stress test requirements for non-automotive-qualified parts used in cabin modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6303ESA+ | Same electrical specs and pinout, but in 8-pin SO package (smaller footprint, surface-mount only) | Preferred for space-constrained PCBs and automated assembly; lacks through-hole mounting option | Select MAX6303ESA+ when board real estate is limited and reflow soldering is available. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold, 2.5µA ICC, open-drain RESET, no watchdog function | Suitable only for basic power-on reset; cannot replace adjustable reset/watchdog capability of MAX6303EPA+ | Choose TPS3808G125DBVR only if application requires only fixed-threshold reset and zero watchdog overhead. |
Compared with MAX6303ESA+, the MAX6303EPA+ offers through-hole assembly flexibility and identical performance; compared with TPS3808G125DBVR, it adds critical watchdog supervision and user-defined reset voltage - essential for firmware reliability in unattended embedded systems.
Availability
MAX6303EPA+ is available at Aetrix Electronics and suitable for medical equipment, industrial PLCs, battery-powered smart meters, and automotive telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6303EPA+ 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, emphasizing low power, high reliability, and integration.
The MAX6301–MAX6304 family was engineered specifically for microprocessor supervision in resource-constrained, battery-operated, and safety-critical systems - delivering adjustable reset, scalable watchdog, and robust transient immunity in compact packages.
FAQ
What is the guaranteed minimum VCC at which MAX6303EPA+ asserts RESET?
The MAX6303EPA+ guarantees RESET assertion for VCC ≥ 1V across its full operating temperature range (–40°C to +85°C). This ensures fail-safe reset initiation even during severe brownout conditions where other supervisors may release reset prematurely. Below 1V, RESET behavior is not specified, though external pulldown resistors can extend validity to 0V per application note.
Can MAX6303EPA+ monitor a 1.8V supply rail?
Yes, the MAX6303EPA+ can monitor a 1.8V rail using an external resistor divider on RESET IN. With VRST = 1.22 × (R1 + R2)/R2, setting R1 = 560kΩ and R2 = 1MΩ yields VRST ≈ 1.79V - well within the 1.20V–5.50V operating range. The ±1nA input leakage ensures minimal divider current error, preserving threshold accuracy.
How does the 500× watchdog timeout multiplier work in MAX6303EPA+?
In MAX6303EPA+, asserting WDS = VCC activates extended watchdog mode, multiplying the base timeout (tWD = 2.67 × CSWT) by exactly 500×. For example, CSWT = 1500pF gives tWD = 4.0ms → extended tWD = 2.0s. This enables long sleep intervals while retaining full watchdog coverage - ideal for wake-up timer applications without external timing components.
Is MAX6303EPA+ pin-compatible with other members of the MAX6301–MAX6304 family?
Yes, all MAX6301–MAX6304 variants share identical 8-pin PDIP/SO/µMAX pinouts and core functionality. The MAX6303EPA+ differs only in output configuration (push-pull active-low RESET) and temperature grade (–40°C to +85°C); R1/R2, CSRT, and CSWT values remain interchangeable across the family for equivalent timing behavior.
What capacitor type is recommended for SRT and SWT connections on MAX6303EPA+?
Ceramic capacitors with leakage <10nA are recommended for both SRT and SWT. X7R or C0G dielectrics provide stable capacitance and low leakage across temperature and bias. Avoid electrolytic or high-leakage film types - their parasitic currents distort the 500nA timing current, causing inaccurate tRP and tWD. Typical values: 1500pF for 4ms reset timeout, 1000pF for 2.67ms base watchdog period.
MAX6303EPA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX6303EPA+ FAQ
1.How can I place an order for MAX6303EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6303EPA+ 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 MAX6303EPA+ reliable?
The price and inventory of MAX6303EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6303EPA+ is usually 5 days.
3.What payment methods are accepted for MAX6303EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6303EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6303EPA+?
MAX6303EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6303EPA+ 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 MAX6303EPA+?
For technical support, including MAX6303EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6303EPA+ requirements.
6.How does Aetrix verify that MAX6303EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX6303EPA+ 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 MAX6303EPA+ meets industry standards.
7.What is the process for return or replacement of MAX6303EPA+?
All MAX6303EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6303EPA+, 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 MAX6303EPA+ part is unused and in its original packaging.
Return procedure for MAX6303EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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