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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:4,951
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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 adjustable watchdog timeout (2.8–5.2 ms normal / 1.4–2.6 s extended mode). It features 4µA supply current, power-supply transient immunity, and operates from 1.31V to 5.5V - used in battery-powered medical instruments and embedded controllers requiring reliable brownout detection and software hang protection.
For engineers reviewing the MAX6304CUA datasheet, MAX6304CUA pinout, MAX6304CUA application, or MAX6304CUA equivalent, this page delivers verified functional identity, µMAX-8 package mapping, confirmed reset/watchdog timing behavior, output logic polarity and drive type, and real-world design implications of adjustable thresholds and 500× watchdog extension.
Technical Context
The MAX6304CUA implements a precision bandgap-based reset comparator with 1.22V internal reference, enabling external resistor-divider programming of reset threshold above 1.22V. Its reset assertion is guaranteed for VCC ≥ 1.31V, and its active-high push-pull output drives high during fault conditions and deasserts low after timeout.
Watchdog operation supports two distinct modes: normal mode (WDS = GND) yields µs-range timeouts via CSWT capacitor; extended mode (WDS = VCC) multiplies timeout by 500× using same capacitor, enabling minute-scale supervision. WDI accepts sub-30ns transitions and clears the timer on any edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-high, push-pull - directly drives µP reset pin without external pull-up; sinks 0.4V max at 3.2mA. |
| Supply Voltage Range | 1.31V to 5.5V - supports single-cell Li-ion and 3.3V/5V systems; valid reset asserted down to VCC = 1.31V. |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable equipment with continuous supervision. |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - sets minimum detectable voltage drop; actual threshold set externally via R1/R2 divider. |
| Reset Timeout (tRP) | 4.0ms typical with 1500pF on SRT - ensures µP completes power-up initialization before release. |
| Watchdog Timeout (tWD) | 4.0ms normal / 2.0s extended with 1500pF on SWT - selectable via WDS pin; supports both fast hang detection and ultra-low-power wake-up timers. |
| Power-Supply Transient Immunity | Withstands ≤50µs negative transients of 100mV below VRST - prevents false resets during switching noise or load dumps. |
Pinout & Package
MAX6304CUA is housed in an 8-pin µMAX® package (U8-1 outline, 3mm × 3mm, 0.65mm pitch), RoHS-compliant and thermally rated for 0°C to +70°C operation. The package supports fine-pitch PCB layout with exposed pad for thermal enhancement.
| 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 drift. |
| 2 GND | Analog/digital ground reference | Common return for internal comparators, timing current sources, and output drivers; must be low-impedance. |
| 3 SRT | Reset timeout capacitor connection | Precision 500nA current source charges CSRT; tRP = 2.67 × CSRT (pF → µs); requires low-leakage ceramic cap. |
| 4 SWT | Watchdog timeout capacitor connection | Identical 500nA current source as SRT; tWD = 2.67 × CSWT (pF → µs); same capacitor value yields 500× longer timeout when WDS = VCC. |
| 5 WDS | Watchdog mode select | Digital control: GND = normal mode (µs timeout), VCC = extended mode (500× multiplier); transition resets watchdog timer. |
| 6 WDI | Watchdog input | Edge-sensitive input; rising/falling transition within timeout period clears timer; 30ns minimum pulse width supported. |
| 7 RESET | Active-high push-pull reset output | Drives high during reset condition; VOH ≥ VCC−0.4V at 0.8mA; VOL ≤ 0.4V at 3.2mA; no external pull-up needed. |
| 8 VCC | Supply voltage input | Operates from 1.31V–5.5V; bypass with 0.1µF ceramic capacitor placed adjacent to pin for noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Set to any voltage ≥1.22V using two external resistors - enables precise brownout detection across diverse supply rails. |
| 500× watchdog timeout multiplier | WDS pin selects extended mode, converting 4ms base timeout into 2s - eliminates need for large capacitors in low-power wake-up applications. |
| 4µA quiescent current | Enables continuous supervision in energy-constrained devices like portable ECG monitors and wireless sensors without compromising battery life. |
| Power-supply transient immunity | Rejects ≤50µs glitches 100mV below VRST - maintains system stability in noisy industrial or automotive environments. |
| Guaranteed reset assertion at VCC ≥ 1.31V | Ensures µP remains held in reset until supply stabilizes above operational minimum - critical for reliable boot in Li-ion powered systems. |
Applications
| Medical Instrumentation | Embedded Industrial Controller |
|---|---|
Use Scenario: Portable blood glucose meter with sleep/wake cycle to extend battery life beyond 2 years. IC Role / Device Role / Timing Role: MAX6304CUA acts as wake-up timer and brownout protector: WDS toggled by µC to switch between normal watchdog (during active mode) and 500× extended mode (during sleep). Use Value: Enables 22-minute wake intervals using only 1µF capacitor on SWT - reduces µC active time by >95%, cutting average system current to <1µA. | Use Scenario: PLC I/O module operating from unregulated 24V rail with frequent motor switching noise. IC Role / Device Role / Timing Role: MAX6304CUA monitors local 3.3V LDO output; RESET IN tied to divider from 3.3V rail; SRT set for 4ms timeout. Use Value: Immunity to 50µs/100mV transients prevents spurious resets during relay actuation - improves uptime in factory automation. |
| Battery-Powered Set-Top Box | Intelligent Sensor Node |
Use Scenario: Low-cost STB with remote wake capability and firmware update recovery. IC Role / Device Role / Timing Role: MAX6304CUA provides dual-function reset: power-on reset via VCC monitoring and watchdog reset triggered by missed WDI pulses during OTA update. Use Value: Active-high push-pull output interfaces directly with STB SoC's reset pin - eliminates pull-up resistor and associated BOM cost and board space. | Use Scenario: Wireless temperature sensor node powered by coin cell, transmitting every 5 minutes. IC Role / Device Role / Timing Role: MAX6304CUA supervises µC during deep-sleep; RESET IN connected to battery voltage divider; SRT configured for 4ms, SWT for 2s. Use Value: Adjustable threshold detects end-of-life battery sag (e.g., 2.4V cutoff) while 2s watchdog ensures firmware hangs are recovered - extends field deployment interval. |
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 output; requires external pull-up resistor; identical timing, threshold, and supply specs. | Suitable where bus-sharing or level translation is needed; not ideal for direct µP reset pin drive without added component. | Select MAX6302CUA only if open-drain interface is required; otherwise MAX6304CUA offers lower BOM count and simpler layout. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; 300ms min timeout; 1.5µA IQ; SOT-23-6 package; no adjustable watchdog. | Limited to fixed-voltage systems; lacks programmable watchdog and reset threshold - insufficient for multi-rail or wake-up timer use cases. | Choose TPS3808G33DBVR only for cost-sensitive, single-rail 3.3V designs without watchdog requirements; MAX6304CUA provides full adjustability and dual-mode supervision. |
Compared with MAX6302CUA, MAX6304CUA eliminates the need for an external pull-up resistor and simplifies PCB routing; compared with TPS3808G33DBVR, it delivers field-programmable reset voltage, user-defined timeout periods, and 500× watchdog extension - essential for battery longevity and multi-voltage system robustness.
Availability
MAX6304CUA is available at Aetrix Electronics and suitable for medical instrumentation, embedded industrial controllers, battery-powered set-top boxes, and intelligent sensor nodes requiring stable component supply across long production 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) 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 space-constrained, battery-operated, and noise-prone systems - emphasizing adjustable thresholds, ultra-low IQ, and flexible watchdog architecture.
FAQ
What is the minimum supply voltage at which MAX6304CUA guarantees reset assertion?
MAX6304CUA guarantees active-high reset assertion for VCC ≥ 1.31V. Below this voltage, reset behavior is not specified. This threshold ensures reliable hold-down during brownout conditions in 1.8V and higher logic systems, and aligns with the device's active-high push-pull output drive capability starting at 1.31V.
How does the WDS pin affect watchdog timeout on MAX6304CUA?
On MAX6304CUA, the WDS pin selects watchdog mode: when pulled to GND, it enables normal mode with timeout tWD = 2.67 × CSWT (µs); when pulled to VCC, it enables extended mode multiplying timeout by 500× (e.g., 1500pF yields ~2s). A WDS state change immediately resets the watchdog counter.
Can MAX6304CUA monitor voltages other than VCC?
Yes. MAX6304CUA monitors any DC voltage applied to the RESET IN pin via an external resistor divider. The reset threshold VRST is calculated as 1.22 × (R1 + R2)/R2, allowing supervision of 1.5V, 2.5V, 3.3V, or custom rails - commonly used to track battery voltage or secondary LDO outputs.
What capacitor type is recommended for SRT and SWT on MAX6304CUA?
Ceramic capacitors are recommended for both SRT and SWT pins on MAX6304CUA due to their low leakage (<10nA) and stable capacitance over temperature/voltage. Avoid electrolytic or high-leakage film types, as the 500nA precision timing current sources are highly sensitive to leakage-induced timing errors.
Is MAX6304CUA pin-compatible with other members of the MAX6301–MAX6304 family?
Yes. All MAX6301–MAX6304 variants share identical 8-pin µMAX pinout, including MAX6304CUA. However, output logic polarity (active-high vs. active-low) and drive type (push-pull vs. open-drain) differ across the family - MAX6304CUA is active-high push-pull, while MAX6301CUA is active-low open-drain.
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:
- 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 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.
MAX6304CUA Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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