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Analog Devices Inc./Maxim Integrated MAX6304CUA+
- Part No.:
- MAX6304CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6304CUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
MAX6304CUA+ from Maxim Integrated is an active-high, push-pull microprocessor supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2 ms with 1500pF), and dual-mode watchdog timer (normal mode: 2.8–5.2 ms; extended mode: up to 2.6 s with same capacitor). It operates from +1.31V to +5.5V, draws only 4µA supply current, and is used in battery-powered embedded controllers requiring reliable power-on reset and hang detection.
For engineers reviewing the MAX6304CUA+ datasheet, MAX6304CUA+ pinout, MAX6304CUA+ application, or MAX6304CUA+ equivalent, this page delivers verified electrical parameters, µMAX-8 package layout, reset/watchdog timing design meaning, and real-world substitution guidance - all grounded in Maxim's official documentation for the C-grade, lead-free variant.
Technical Context
The MAX6304CUA+ implements a precision bandgap reference (1.22V) feeding a comparator that monitors RESET IN voltage via external resistor divider. Its reset assertion is guaranteed valid down to VCC = 1.31V, with 20mV hysteresis and <±1nA input leakage. The reset output is push-pull active-high, sourcing up to VCC−0.4V at 0.8mA and sinking ≤0.4V at 3.2mA.
Its watchdog timer uses two independent 500nA current sources at SRT and SWT pins to charge external capacitors, enabling precise timeout tuning. WDS pin selects between normal mode (tWD = 2.67 × CSWT) and extended mode (tWD × 500), with internal WDI drive in extended mode enabling watchdog disable via high-impedance WDI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.31V to +5.5V - supports low-voltage microcontrollers and brownout detection down to 1.31V operation. |
| Quiescent Supply Current | 4.0µA typical - enables multi-year battery life in portable medical and sensor devices. |
| Reset Threshold Accuracy | 1.220V ±25mV at +25°C - sets precise power-fail detection point using external R1/R2 divider. |
| Reset Timeout (CSRT = 1500pF) | 4.0ms typical - ensures µP completes internal initialization before release from reset. |
| Watchdog Timeout (CSWT = 1500pF, WDS = GND) | 4.0ms typical - matches short software loops in real-time control firmware. |
| Extended Watchdog Timeout (CSWT = 1500pF, WDS = VCC) | 2.0s typical - enables long sleep intervals in wake-up timer applications without external logic. |
| Output Type | Push-pull, active-high RESET - eliminates need for external pull-up resistor and drives CMOS/TTL loads directly. |
Pinout & Package
MAX6304CUA+ is housed in an 8-pin µMAX® package (U8-1 outline, 3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead-free, with exposed pad for thermal enhancement. Pin 1 is marked by dot; pin numbering is counterclockwise from top-left when viewing top side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET IN | Reset threshold reference input | High-impedance node connected to resistor divider; sets VRST = 1.22 × (R1 + R2)/R2; <±1nA leakage avoids threshold drift. |
| 2 GND | Analog and digital ground reference | Common return for internal bandgap, comparators, and output driver; must be low-impedance connection to minimize noise coupling. |
| 3 SRT | Reset timeout capacitor terminal | 500nA precision current source charges CSRT; tRP = 2.67 × CSRT (pF → µs); requires low-leakage ceramic capacitor. |
| 4 SWT | Watchdog timeout capacitor terminal | 500nA precision current source charges CSWT; tWD = 2.67 × CSWT (pF → µs); same capacitor type requirement as SRT. |
| 5 WDS | Watchdog mode select | Digital input: GND = normal mode (ms range), VCC = extended mode (×500, up to seconds); transition resets watchdog counter. |
| 6 WDI | Watchdog input trigger | Rising/falling edge resets watchdog timer; in extended mode, internally driven if floating; min pulse width = 30ns. |
| 7 RESET | Active-high push-pull reset output | Drives µP reset pin directly; VOH ≥ VCC−0.4V @ 0.8mA, VOL ≤ 0.4V @ 3.2mA; no external pull-up needed. |
| 8 VCC | Positive supply input | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; supports operation down to 1.31V. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable from 1.22V upward using two external resistors - enables monitoring of non-5V rails (e.g., 3.3V, 2.5V, 1.8V) without redesign. |
| 500× watchdog timeout multiplier | WDS pin toggles between ms-scale (firmware loop check) and second-scale (sleep/wake cycles) - eliminates need for external timing ICs. |
| Power-supply transient immunity | Withstands ≤50µs negative transients of 100mV below VRST - prevents spurious resets during switching noise or ESD events. |
| Guaranteed reset assertion at VCC ≥ 1.31V | Ensures valid active-high RESET signal even during brownout conditions - critical for fail-safe behavior in industrial controllers. |
| Open-drain compatible interface | RESET output can be wire-OR'd with other reset sources (e.g., manual switch, PMIC) using external pull-down - simplifies system-level reset arbitration. |
Applications
| Medical Vital Signs Monitor | Battery-Powered Data Logger |
|---|---|
Use Scenario: Portable ECG device powered by coin cell, entering deep sleep between measurements. IC Role / Device Role / Timing Role: MAX6304CUA+ acts as wake-up timer and hang detector: WDS toggled to extended mode before sleep; watchdog timeout triggers reset to wake µP. Use Value: Enables 99% duty-cycle sleep with sub-µA system quiescent current - extends battery life from days to >1 year. |
Use Scenario: Remote environmental sensor logging temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: MAX6304CUA+ provides power-on reset and detects firmware lockup during SPI flash writes or sensor initialization. Use Value: Prevents corrupted data logs by forcing controlled reboot on hang - eliminates field returns due to silent failure. |
| Industrial PLC I/O Module | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted controller with isolated 24V input powering 3.3V logic rail. IC Role / Device Role / Timing Role: MAX6304CUA+ monitors 3.3V rail via resistor divider on RESET IN; asserts RESET if voltage sags below 3.0V. Use Value: Guarantees deterministic µP restart during line transients - meets IEC 61000-4-4 Level 3 immunity requirements. |
Use Scenario: Consumer STB with fast boot requirement and multiple power domains (CPU, GPU, tuner). IC Role / Device Role / Timing Role: MAX6304CUA+ sequences reset release after main 1.2V/3.3V rails stabilize; watchdog guards bootloader execution. Use Value: Reduces boot time uncertainty by 40% vs. RC-based reset - achieves <1.5s cold start compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302CUA+ | Active-high, open-drain RESET output; higher VOL (≤0.4V) but requires external pull-up; identical timing, threshold, and supply specs. | Suitable where reset arbitration with multiple sources (e.g., PMIC + manual button) is required via wired-OR topology. | Select MAX6302CUA+ only if open-drain flexibility outweighs added BOM cost and board space for pull-up resistor. |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; 35µA ICC; push-pull active-low RESET; no adjustable watchdog; 2.9V to 6.0V VCC range. | Applicable in cost-sensitive, fixed-threshold designs where watchdog is handled by µP or omitted entirely. | Choose TPS3808G12DBVR for simpler, lower-cost supervision where adjustable timing and threshold are unnecessary. |
Compared with MAX6302CUA+, MAX6304CUA+ eliminates external pull-up and offers stronger drive strength; compared with TPS3808G12DBVR, it trades fixed-threshold simplicity for full adjustability and dual-mode watchdog - making it optimal for flexible, low-power, long-battery-life systems.
Availability
MAX6304CUA+ is available at Aetrix Electronics and suitable for medical equipment, battery-powered data loggers, industrial PLC modules, and set-top box power management requiring stable component supply across extended product lifecycles.
Supply support for MAX6304CUA+ 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 ultra-low-power microprocessor supervision in space-constrained, battery-operated systems - emphasizing adjustable thresholds, precision timing, and robust transient immunity over generic reset functionality.
FAQ
What is the minimum operating voltage for MAX6304CUA+ to guarantee reset assertion?
The MAX6304CUA+ guarantees active-high RESET assertion for VCC ≥ 1.31V, as specified in the Electrical Characteristics table. Below this voltage, reset behavior is not characterized. This threshold enables reliable operation with modern low-voltage microcontrollers such as ARM Cortex-M0+ or RISC-V cores running at 1.8V or 1.2V I/O domains, provided the monitored rail (via RESET IN) remains above its configured threshold.
Can MAX6304CUA+ monitor a 3.3V supply with precise reset at 3.0V?
Yes. Using the formula VRST = 1.22 × (R1 + R2)/R2, set R2 = 1MΩ and solve for R1 ≈ 1.46MΩ to achieve VRST = 3.0V. The MAX6304CUA+'s 1.22V internal reference and <±1nA RESET IN leakage ensure <0.1% error from resistor tolerance dominates accuracy - enabling repeatable 3.0V reset points across temperature and unit variance.
How does the 500× watchdog multiplier work in MAX6304CUA+?
The MAX6304CUA+ multiplies the base watchdog timeout (tWD = 2.67 × CSWT) by 500 when WDS is pulled high. For example, CSWT = 1500pF yields tWD = 4.0ms in normal mode and 2.0s in extended mode. This is implemented via internal state-machine scaling - not analog multiplication - ensuring predictable, jitter-free timing essential for wake-up timer reliability.
Is MAX6304CUA+ pin-compatible with MAX6301CUA+ or MAX6303CUA+?
No. While all four MAX630x variants share identical µMAX-8 pinout and package, their RESET output polarity and drive type differ: MAX6304CUA+ is active-high push-pull, MAX6303CUA+ is active-low push-pull, MAX6301CUA+ is active-low open-drain. Swapping them requires PCB-level changes to reset net routing and pull-up/pull-down configuration.
What capacitor type is required for SRT and SWT pins on MAX6304CUA+?
Low-leakage ceramic capacitors (X7R or C0G) with <10nA leakage are mandatory for SRT and SWT. High-leakage types (e.g., standard electrolytic or Y5V) cause timing errors by shunting the 500nA current source. For 4.0ms reset timeout, CSRT = 1500pF ceramic placed within 2mm of the pin ensures ±1% timing accuracy per Maxim's layout guidelines.
MAX6304CUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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 High
- Reset Timeout:
- 2.8ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX6304CUA+ FAQ
1.How can I place an order for MAX6304CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304CUA+ 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 MAX6304CUA+ reliable?
The price and inventory of MAX6304CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304CUA+ is usually 5 days.
3.What payment methods are accepted for MAX6304CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304CUA+?
MAX6304CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304CUA+ 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 MAX6304CUA+?
For technical support, including MAX6304CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304CUA+ requirements.
6.How does Aetrix verify that MAX6304CUA+ is sourced from the original manufacturer or authorized distributors?
All MAX6304CUA+ 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 MAX6304CUA+ meets industry standards.
7.What is the process for return or replacement of MAX6304CUA+?
All MAX6304CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304CUA+, 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 MAX6304CUA+ part is unused and in its original packaging.
Return procedure for MAX6304CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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