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Analog Devices Inc./Maxim Integrated MAX6304CUA+T
- Part No.:
- MAX6304CUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6304CUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
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Product details
Overview
The MAX6304CUA+T from Maxim Integrated is an active-high, push-pull µP supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (via external capacitor on SRT), and dual-mode watchdog timer (normal/extended via WDS pin). 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 software hang detection.
For engineers reviewing the MAX6304CUA+T datasheet, MAX6304CUA+T pinout, MAX6304CUA+T application, or MAX6304CUA+T equivalent, key selection factors include its active-high push-pull RESET output, guaranteed operation down to VCC = 1.31V, 500× watchdog timeout multiplier, immunity to VCC transients ≤50µs at 100mV overdrive, and compatibility with low-leakage ceramic timing capacitors on SRT/SWT pins.
Technical Context
The MAX6304CUA+T implements a precision bandgap reference (1.22V) feeding a comparator for reset threshold generation, with external resistor divider scaling. Its reset timeout and watchdog timeout are set by internal 500nA current sources charging external capacitors on SRT and SWT pins respectively.
Watchdog operation supports two distinct modes: normal mode (WDS = GND, tWD in ms range) and extended mode (WDS = VCC, tWD × 500, up to ~22 minutes with 1µF). The WDI input accepts ≥30ns pulses and clears the watchdog timer on any transition; in extended mode, it can be left unconnected due to internal periodic drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - supports single-cell Li-ion and 3.3V/5V systems without level-shifting |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable medical and sensor devices |
| Reset Output Type | Active-high, push-pull - drives RESET directly without external pull-up, compatible with most µP reset inputs |
| Reset Threshold Reference | 1.22V ±25mV - sets minimum detectable voltage drop via external R1/R2 divider (VRST = 1.22 × (R1+R2)/R2) |
| Reset Timeout Range | 2.8ms to 5.2ms with 1500pF on SRT - configurable from µs to seconds using CSRT = tRP / 2.67 (pF/µs) |
| Watchdog Timeout (Normal) | 2.8ms to 5.2ms with 1500pF on SWT - matches fast-boot µP execution cycles |
| Watchdog Timeout (Extended) | 1.4s to 2.6s with 1500pF on SWT - enables long sleep intervals in wake-up timer applications |
Pinout & Package
MAX6304CUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead-free. Pin 1 is RESET IN; pin 2 is GND; pin 3 is SRT; pin 4 is SWT; pin 5 is WDS; pin 6 is WDI; pin 7 is RESET; pin 8 is VCC.
| 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 ≥1.22V; leakage <±1nA avoids threshold error |
| 2 - GND | Analog and digital ground reference | Shared return for internal reference, comparators, and output drivers; must be low-impedance |
| 3 - SRT | Reset timeout capacitor connection | Sinks 500nA to charge external CSRT; timing accuracy requires low-leakage (<10nA) ceramic capacitor |
| 4 - SWT | Watchdog timeout capacitor connection | Sinks 500nA to charge external CSWT; same leakage requirements as SRT for stable tWD |
| 5 - WDS | Watchdog mode select | Logic-low = normal mode (ms timeout); logic-high = extended mode (×500 timeout); transitions reset timer |
| 6 - WDI | Watchdog input | Rising/falling edge resets watchdog; ≥30ns pulse width sufficient; unconnected allowed only in extended mode |
| 7 - RESET | Active-high push-pull reset output | Drives high when VCC > VRST and timeout expires; sinks/source current specified per VCC (e.g., VOL = 0.4V @ ISINK = 3.2mA) |
| 8 - VCC | Power supply input | Requires 0.1µF ceramic bypass close to pin; valid operation guaranteed from 1.31V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Set to any voltage ≥1.22V using two external resistors - eliminates need for fixed-threshold parts across diverse supply rails |
| Dual-mode watchdog timer | 500× timeout extension via WDS pin - enables both fast hang detection and ultra-low-power wake-up timing in one device |
| Power-supply transient immunity | Immune to negative VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in noisy industrial environments |
| Guaranteed reset assertion at low VCC | RESET valid down to VCC = 1.31V - ensures reliable boot in brownout conditions before µP loses functionality |
| Low-leakage timing inputs | SRT/SWT pins draw precise 500nA - enables accurate, capacitor-based timeout programming without trimming |
Applications
| Battery-Powered Medical Devices | Industrial Embedded Controllers |
|---|---|
Use Scenario: Portable glucose meters and handheld ECG monitors operating from single Li-ion cells with deep discharge protection. IC Role / Device Role / Timing Role: Supervises VCC during battery depletion; asserts RESET when cell voltage drops below 2.8V (set via R1/R2); uses extended watchdog to wake µP every 5 minutes for sensor sampling. Use Value: Prevents corrupted measurements during brownout; extends battery life by enabling µP sleep between readings while maintaining watchdog coverage. |
Use Scenario: Programmable logic controllers (PLCs) in factory automation requiring fail-safe restart after power interruption or firmware crash. IC Role / Device Role / Timing Role: Monitors 3.3V rail; triggers active-high RESET to ARM Cortex-M4; configures 100ms reset timeout and 200ms watchdog timeout for deterministic recovery. Use Value: Eliminates need for discrete RC reset circuits; provides immunity to 20µs line transients common in motor-drive environments. |
| Intelligent Instrumentation | Set-Top Box Power Management |
Use Scenario: Digital multimeters and spectrum analyzers with FPGA-based signal processing and auto-ranging logic. IC Role / Device Role / Timing Role: Resets FPGA configuration controller on power-up; uses adjustable reset threshold to track analog front-end bias rails; disables watchdog during calibration sequences via WDS control. Use Value: Ensures synchronized startup of mixed-signal subsystems; avoids false watchdog timeouts during known long-duration operations. |
Use Scenario: Consumer STBs with standby-to-wake latency requirements <500ms and firmware update rollback safety. IC Role / Device Role / Timing Role: Generates power-on RESET for main SoC; employs normal-mode watchdog (150ms timeout) to detect bootloader hangs; uses manual reset switch parallel to R2 for field service recovery. Use Value: Guarantees clean boot state after AC cycle; enables user-initiated recovery without opening enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302CUA+T | Active-high, open-drain RESET output; no internal pull-up required but needs external pull-up resistor | Better suited for bidirectional reset buses (e.g., Motorola 68HC11) where shared reset lines require wired-OR logic | Select when interfacing with legacy µPs requiring open-drain reset or when board layout allows external pull-up placement |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; no adjustable timeout or watchdog; 1.5µA quiescent current; SOT-23-6 package | Targeted at space-constrained, cost-sensitive applications where only basic power-on reset is needed | Select when design does not require programmable timing or watchdog functionality and PCB area is critical |
Compared with MAX6302CUA+T, the MAX6304CUA+T provides push-pull drive eliminating external components, while TPS3808G12DBVR trades adjustability for lower current and smaller footprint-making MAX6304CUA+T optimal for designs needing flexible timing and robust reset drive without added BOM items.
Availability
MAX6304CUA+T is available at Aetrix Electronics and suitable for battery-powered medical devices, industrial embedded controllers, intelligent instrumentation, and set-top box power management requiring stable component supply across production lifecycles.
Supply support for MAX6304CUA+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) 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 portable and embedded systems, emphasizing adjustable thresholds, dual-mode watchdog flexibility, and ultra-low quiescent current.
FAQ
What is the minimum VCC required for MAX6304CUA+T to assert a valid RESET signal?
The MAX6304CUA+T guarantees RESET assertion for VCC ≥ 1.31V. Below this voltage, the internal reference and comparator may not operate reliably. For applications requiring reset validity down to 0V, a 100kΩ pullup resistor from RESET to VCC is recommended, as documented in the MAX6304-specific section of the datasheet. This ensures RESET remains high even as VCC collapses.
How do I configure the MAX6304CUA+T for a 3.3V system with a 2.5V reset threshold?
To set VRST = 2.5V on the MAX6304CUA+T, use the formula VRST = 1.22 × (R1 + R2)/R2. Select R2 = 1MΩ, then solve for R1: R1 = R2 × (VRST/1.22 − 1) ≈ 1.05MΩ. Use standard 1% resistors (e.g., R2 = 1.00MΩ, R1 = 1.05MΩ) and connect them between VCC, RESET IN, and GND. Verify threshold with oscilloscope during power ramp.
Can the watchdog function of the MAX6304CUA+T be disabled entirely?
Yes - the watchdog can be disabled in extended mode (WDS = VCC) by leaving WDI unconnected or three-stating it. In this configuration, the internal driver pulses WDI near timeout to prevent reset. In normal mode (WDS = GND), WDI must be actively toggled; leaving it floating is not permitted and may cause erratic behavior per the datasheet's layout guidance.
What capacitor types are acceptable for SRT and SWT on the MAX6304CUA+T?
Only low-leakage ceramic capacitors with leakage <10nA are acceptable for SRT and SWT. X7R and C0G dielectrics are preferred. Avoid electrolytic, tantalum, or high-leakage ceramics (e.g., Y5V), as their leakage distorts the 500nA timing current and causes significant timeout error. Typical values range from 100pF to 10nF depending on desired tRP/tWD.
Does the MAX6304CUA+T support monitoring voltages other than VCC?
Yes - the MAX6304CUA+T monitors any DC voltage applied to RESET IN. To supervise a 1.8V I/O rail, for example, connect a resistor divider from that rail to RESET IN, sized to produce ≥1.22V at the pin when the rail is nominal. The device does not source/sink current into the monitored rail, making it suitable for isolated or low-current nodes.
MAX6304CUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 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+T FAQ
1.How can I place an order for MAX6304CUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304CUA+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 MAX6304CUA+T reliable?
The price and inventory of MAX6304CUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304CUA+T is usually 5 days.
3.What payment methods are accepted for MAX6304CUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304CUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304CUA+T?
MAX6304CUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304CUA+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 MAX6304CUA+T?
For technical support, including MAX6304CUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304CUA+T requirements.
6.How does Aetrix verify that MAX6304CUA+T is sourced from the original manufacturer or authorized distributors?
All MAX6304CUA+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 MAX6304CUA+T meets industry standards.
7.What is the process for return or replacement of MAX6304CUA+T?
All MAX6304CUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304CUA+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 MAX6304CUA+T part is unused and in its original packaging.
Return procedure for MAX6304CUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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