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Analog Devices Inc./Maxim Integrated MAX6304CSA+
- Part No.:
- MAX6304CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6304CSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:164
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Product details
Overview
MAX6304CSA+ from Maxim Integrated is an active-high, push-pull microprocessor supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (via external capacitor on SRT), and dual-mode watchdog timer (normal or 500× 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 brownout and hang detection.
For engineers reviewing the MAX6304CSA+ datasheet, MAX6304CSA+ pinout, MAX6304CSA+ application, or MAX6304CSA+ equivalent, key selection criteria include its active-high push-pull RESET output, guaranteed operation down to VCC = 1.31V, 500× watchdog extension capability, power-supply transient immunity, and SO-8 package compatibility with space-constrained industrial and portable designs.
Technical Context
The MAX6304CSA+ implements a precision bandgap-based reset comparator with 1.22V internal reference, enabling user-defined reset thresholds via external resistor divider on RESET IN. Its reset timeout is generated by a 500nA current source charging CSRT, yielding tRP = 2.67 × CSRT (in µs for pF).
Watchdog timing uses the same 500nA current source on SWT, with mode selection via WDS: normal mode (WDS = GND) gives tWD in ms; extended mode (WDS = VCC) multiplies tWD by 500, enabling timeouts up to ~22 minutes with 1µF. WDI accepts ≥30ns pulses and clears the timer on any transition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - supports low-voltage microcontrollers and wide-input systems |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable equipment |
| Reset Output Type | Push-pull, active-high - drives RESET line directly without external pull-up, simplifies interface |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - ensures precise brownout detection across temperature |
| Watchdog Timeout Range | 2.8ms–5.2ms (normal) or 1.4s–2.6s (extended) with 1500pF - configurable for fast or long-duration software monitoring |
| Power-Supply Transient Immunity | Rejects ≤50µs transients down to 100mV below VRST - prevents false resets during noise events |
| Operating Temperature | 0°C to +70°C - suitable for commercial-grade embedded control applications |
Pinout & Package
MAX6304CSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and 5.0mm × 6.2mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Reset threshold input | High-impedance node for external resistor divider; sets VRST = 1.22 × (R1 + R2)/R2 |
| 2 - GND | Ground reference | Primary return path for all internal circuits and timing current sources |
| 3 - SRT | Reset timeout capacitor input | 500nA current source charges CSRT; determines tRP = 2.67 × CSRT (pF → µs) |
| 4 - SWT | Watchdog timeout capacitor input | 500nA current source charges CSWT; determines tWD (normal) or 500×tWD (extended) |
| 5 - WDS | Watchdog mode select | Logic level selects normal (GND) or extended (VCC) watchdog timeout multiplier |
| 6 - WDI | Watchdog input | Edge-sensitive input; any rising/falling transition within timeout period clears watchdog timer |
| 7 - RESET | Active-high push-pull output | Drives µP reset pin high during fault; no external pull-up required |
| 8 - VCC | Supply voltage input | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable above 1.22V using two external resistors - enables monitoring of non-5V rails (e.g., 3.3V, 2.5V, 1.8V) |
| 500× watchdog timeout multiplier | Extends basic timeout from milliseconds to seconds/minutes - supports low-power sleep-wake cycles |
| Power-supply transient immunity | Immune to ≤50µs glitches down to 100mV below VRST - eliminates spurious resets in noisy environments |
| Guaranteed RESET assertion at VCC ≥ 1.31V | Ensures valid reset signal even during deep brownout - critical for fail-safe system recovery |
| Open-drain / push-pull output options across family | MAX6304CSA+ uses push-pull active-high - reduces BOM count and PCB area vs. open-drain + pull-up |
Applications
| Battery-Powered Portable Equipment | Medical Monitoring Devices |
|---|---|
Use Scenario: Handheld glucose meters and pulse oximeters operating from coin-cell batteries with intermittent sensor activation. IC Role / Device Role / Timing Role: Supervises MCU power rail and detects firmware hangs during sleep/wake transitions using extended-mode watchdog. Use Value: 4µA quiescent current extends battery life; 500× watchdog extension allows >20-minute wake intervals without compromising safety. | Use Scenario: Implantable or wearable diagnostic sensors requiring fail-safe reset behavior under variable supply conditions. IC Role / Device Role / Timing Role: Monitors regulated 3.3V supply and asserts active-high RESET to ARM Cortex-M0+ upon undervoltage or software lockup. Use Value: Adjustable 1.22V reference enables precise 2.9V brownout detection; push-pull output ensures robust drive into MCU reset pin. |
| Industrial Embedded Controllers | Set-Top Box Power Management |
Use Scenario: Programmable logic controllers (PLCs) deployed in factory automation with fluctuating 24V DC inputs and isolated 5V/3.3V domains. IC Role / Device Role / Timing Role: Provides independent reset supervision for main controller and communication co-processor, with manual reset support via switch on RESET IN. Use Value: Reset threshold adjustability accommodates multiple rail voltages; transient immunity prevents false resets during relay switching noise. | Use Scenario: Consumer STBs with multi-rail power supplies (12V, 5V, 3.3V) and firmware that must recover reliably after AC dropout. IC Role / Device Role / Timing Role: Monitors primary 5V rail and triggers controlled reboot sequence via active-high RESET when VCC drops below 4.65V. Use Value: Guaranteed RESET assertion down to VCC = 1.31V ensures safe shutdown even during slow power decay; SO-8 footprint fits compact power board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302CSA+ | Active-high, open-drain RESET output; requires external pull-up resistor | Suitable where bus-sharing or wired-OR reset lines are needed | Select MAX6302CSA+ only if open-drain topology is required for system-level reset arbitration |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no adjustable threshold or external timing capacitors | Lower BOM count for fixed-voltage systems; lacks watchdog flexibility | Choose TPS3808G33DBVR when design uses only 3.3V rails and does not require programmable timeout or watchdog extension |
Compared with MAX6304CSA+, MAX6302CSA+ offers identical timing and supervision features but requires external pull-up for active-high operation, while TPS3808G33DBVR trades configurability for simplicity and lower cost in fixed-threshold applications.
Availability
MAX6304CSA+ is available at Aetrix Electronics and suitable for battery-powered portable equipment, medical monitoring devices, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6304CSA+ 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, communications, and consumer markets.
The MAX6301–MAX6304 family was designed specifically for low-power microprocessor supervision in space-constrained, battery-sensitive applications - emphasizing ultra-low ICC, adjustable thresholds, and flexible watchdog timing.
FAQ
What is the minimum supply voltage required for guaranteed operation of the MAX6304CSA+?
The MAX6304CSA+ guarantees full functionality-including active-high RESET assertion-down to VCC = 1.31V. Below this, reset output drive strength degrades; however, the device remains powered and functional through VCC = 1V, with RESET asserted low until VCC falls below 1V. This makes MAX6304CSA+ suitable for brownout detection in low-voltage microcontroller systems.
How do I configure the MAX6304CSA+ for a 4.5V reset threshold?
To set a 4.5V reset threshold on the MAX6304CSA+, use the formula VRST = 1.22 × (R1 + R2)/R2. Select R2 = 1MΩ, then solve for R1: R1 = R2 × (VRST/1.22 − 1) ≈ 1MΩ × (4.5/1.22 − 1) ≈ 2.69MΩ. Use standard 1% resistors (e.g., 1MΩ + 1.69MΩ series) and ensure low-leakage layout around RESET IN.
Can the watchdog function be disabled on the MAX6304CSA+?
Yes - in extended mode (WDS = VCC), the watchdog function can be disabled by leaving WDI unconnected or driving it with a three-stated output. In this configuration, the internal watchdog driver pulses WDI near timeout to prevent reset. In normal mode (WDS = GND), WDI must be actively toggled; leaving it floating is not allowed.
What is the purpose of the SRT and SWT pins on the MAX6304CSA+?
The SRT pin connects to a capacitor that sets the reset timeout period (tRP = 2.67 × CSRT), while the SWT pin connects to a capacitor that sets the basic watchdog timeout (tWD = 2.67 × CSWT). Both pins source a precision 500nA current; capacitor leakage must be <10nA (ceramic recommended) to maintain timing accuracy.
Does the MAX6304CSA+ support manual reset functionality?
Yes - a manual reset can be added by placing a normally open momentary switch in parallel with R2 in the RESET IN voltage divider. Closing the switch pulls RESET IN to GND, triggering a reset. The internal reset timer debounces the switch and holds RESET asserted for the full tRP duration before releasing.
MAX6304CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
MAX6304CSA+ FAQ
1.How can I place an order for MAX6304CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304CSA+ 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 MAX6304CSA+ reliable?
The price and inventory of MAX6304CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304CSA+ is usually 5 days.
3.What payment methods are accepted for MAX6304CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304CSA+?
MAX6304CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304CSA+ 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 MAX6304CSA+?
For technical support, including MAX6304CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304CSA+ requirements.
6.How does Aetrix verify that MAX6304CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX6304CSA+ 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 MAX6304CSA+ meets industry standards.
7.What is the process for return or replacement of MAX6304CSA+?
All MAX6304CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304CSA+, 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 MAX6304CSA+ part is unused and in its original packaging.
Return procedure for MAX6304CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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