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Analog Devices Inc./Maxim Integrated MAX6304CPA+
- Part No.:
- MAX6304CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6304CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,842
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Product details
Overview
The MAX6304CPA+ 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 power-on reset and software hang detection.
For engineers reviewing the MAX6304CPA+ datasheet, MAX6304CPA+ pinout, MAX6304CPA+ application, or MAX6304CPA+ equivalent, this page delivers verified functional identity, confirmed PDIP-8 package mapping, validated 8-pin terminal roles, five core electrical parameters (VCC range, ICC, VTH, tRP, tWD), and two manufacturer-confirmed alternative parts with documented functional and application differences.
Technical Context
The MAX6304CPA+ 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 output is push-pull and active-high, asserted when monitored voltage falls below VRST and held for programmable tRP after recovery.
Its watchdog function uses a precision 500nA timing current source on SWT to generate timeout periods scalable from milliseconds (normal mode, WDS = GND) to seconds (extended mode, WDS = VCC). The WDI input detects edges ≥30ns and clears the timer; WDS transitions also reset the counter, supporting wake-up timer applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +1.31V to +5.5V - supports operation down to low-voltage microcontrollers and ensures valid reset assertion above 1.31V. |
| Supply Current (ICC) | 4.0µA typical - enables multi-year battery life in portable equipment without compromising supervision reliability. |
| Reset Threshold (VTH) | 1.220V ±25mV - stable internal reference enabling precise external threshold setting (VRST = 1.22 × (R1+R2)/R2). |
| Reset Timeout (tRP) | 4.0ms typical (CSRT = 1500pF) - programmable delay prevents premature µP release during power ramp-up. |
| Watchdog Timeout (tWD) | 4.0ms normal mode / 2.0s extended mode (CSWT = 1500pF) - selectable timing granularity for firmware execution monitoring. |
| Power-Supply Transient Immunity | Resists ≤50µs negative transients of 100mV overdrive - avoids false resets during switching noise or load dumps. |
Pinout & Package
MAX6304CPA+ is housed in an 8-pin plastic DIP (PDIP) package, RoHS-compliant and lead-free, with 0.3-inch body width and standard through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset comparator input | Accepts external resistor-divider to set custom reset threshold (VRST ≥ 1.22V); leakage < ±1nA preserves accuracy. |
| 2 - GND | Ground reference | Common return for all internal circuits; must be low-impedance connection to minimize noise coupling into SRT/SWT. |
| 3 - SRT | Reset timeout capacitor node | Sinks 500nA precision current; CSRT value directly sets tRP (tRP = 2.67 × CSRT in µs), requiring low-leakage ceramic cap. |
| 4 - SWT | Watchdog timeout capacitor node | Sinks 500nA precision current; CSWT value sets base tWD (tWD = 2.67 × CSWT in µs); same capacitor constraints as SRT. |
| 5 - WDS | Watchdog mode select | Logic high (VCC) enables 500× extended timeout; logic low (GND) selects normal mode; transition resets watchdog timer. |
| 6 - WDI | Watchdog input | Edge-triggered (≥30ns pulse); rising/falling transition clears watchdog timer; unconnected in extended mode disables watchdog. |
| 7 - RESET | Active-high push-pull reset output | Drives high (VOH ≥ VCC–0.4V @ 0.8mA) when asserted; sinks 3.2mA max; directly interfaces µP reset pins without pull-up. |
| 8 - VCC | Supply voltage input | Operates from +1.31V to +5.5V; requires local 0.1µF bypass capacitor; guarantees RESET assertion down to VCC = 1.31V. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Set to any voltage ≥1.22V using external resistors - eliminates need for fixed-threshold variants across diverse supply rails. |
| 500× watchdog timeout multiplier | WDS pin toggles between ms-scale (normal) and s-scale (extended) timeouts - enables both hang detection and periodic wake-up without extra ICs. |
| 4µA quiescent current | Enables >10-year battery life in coin-cell-powered devices - critical for medical sensors and remote IoT endpoints. |
| Push-pull active-high RESET output | Eliminates external pull-up resistor and reduces board space - simplifies interface to µPs with dedicated active-high reset inputs (e.g., ARM Cortex-M series). |
| Power-supply transient immunity | Withstands 100mV, 50µs glitches without false reset - improves system robustness in noisy industrial or automotive environments. |
Applications
| Medical Vital Sign Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Portable ECG/SpO₂ monitors powered by CR2032 coin cells, requiring guaranteed reset at power-on and brownout recovery. IC Role / Device Role / Timing Role: MAX6304CPA+ asserts active-high RESET during VCC ramp-up and holds it for 4ms; monitors VCC via resistor divider to trigger reset if battery drops below 2.7V. Use Value: Prevents corrupted ADC sampling or flash writes during undervoltage; 4µA ICC extends battery life beyond 5 years in sleep mode. |
Use Scenario: DIN-rail mounted PLC modules exposed to 24V DC supply transients and operating in -25°C to +70°C ambient. IC Role / Device Role / Timing Role: MAX6304CPA+ supervises 3.3V logic rail, using WDS to switch watchdog between 4ms (runtime hang detection) and 2s (low-power sleep wake-up). Use Value: 100mV/50µs transient immunity avoids spurious resets during relay switching; push-pull RESET drives isolated gate drivers without level-shifting. |
| Battery-Powered Smart Meters | Set-Top Box Power Management |
|
Use Scenario: AMI smart meters with lithium-thionyl chloride primary cells, cycling between deep sleep (10µA) and brief RF transmission bursts. IC Role / Device Role / Timing Role: MAX6304CPA+ uses extended-mode watchdog (WDS = VCC) to wake µP every 2 minutes; RESET output controls LDO enable during wake cycles. Use Value: Eliminates need for separate RTC or timer IC; 500× timeout scaling allows precise wake intervals with minimal external components. |
Use Scenario: Consumer set-top boxes with 12V/5V/3.3V rails, requiring coordinated power sequencing and firmware crash recovery. IC Role / Device Role / Timing Role: MAX6304CPA+ monitors 3.3V core rail; RESET output drives FPGA configuration reset and initiates bootloader watchdog handshake. Use Value: Active-high push-pull output ensures clean, fast reset edge into FPGA I/O; adjustable threshold accommodates 3.3V ±5% tolerance without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302CPA+ | Active-high, open-drain RESET output; requires external pull-up resistor; identical VCC range, ICC, and timing architecture. | Suitable where bus-sharing or wired-OR reset lines are needed; not ideal for direct µP reset pin drive without pull-up. | Select MAX6302CPA+ only when open-drain flexibility is required; MAX6304CPA+ is preferred for simplified single-load reset driving. |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; no adjustable watchdog; 1.8–6.0V VCC range; 2.5µA ICC; SOT-23-6 package. | Used in space-constrained designs where fixed threshold suffices and watchdog is unnecessary; lacks WDS/WDI programmability. | Choose TPS3808G12DBVR for cost-sensitive, low-pin-count applications without adjustable timing; MAX6304CPA+ remains optimal for full configurability. |
Compared with MAX6302CPA+, MAX6304CPA+ eliminates external pull-up components and provides stronger drive capability; compared with TPS3808G12DBVR, it trades fixed-threshold simplicity for full adjustability of both reset and watchdog timing-critical for multi-rail or battery-voltage-tracking systems.
Availability
MAX6304CPA+ is available at Aetrix Electronics and suitable for medical vital sign monitors, industrial PLC I/O modules, and battery-powered smart meters requiring stable component supply, long-lifecycle assurance, and RoHS-compliant through-hole packaging.
Supply support for MAX6304CPA+ 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 power, sensing, and interface applications, with emphasis on low-power, high-reliability solutions for industrial and medical end equipment.
The MAX6301–MAX6304 family was engineered specifically for microprocessor supervision in resource-constrained, battery-operated, and noise-prone systems-delivering adjustable reset/watchdog functionality in minimal footprint with ultra-low quiescent current.
FAQ
What is the minimum VCC required for guaranteed RESET assertion in MAX6304CPA+?
The MAX6304CPA+ guarantees active-high RESET assertion for VCC ≥ 1.31V. Below this voltage, RESET behavior is not specified. This threshold ensures reliable reset initiation even with partially discharged batteries or low-dropout regulator droop, making MAX6304CPA+ suitable for 1.8V and higher µP systems where early reset signaling is critical.
How does the WDS pin affect watchdog operation in MAX6304CPA+?
In MAX6304CPA+, the WDS pin selects watchdog mode: logic low (GND) enables normal mode with millisecond-scale timeout (e.g., 4ms with 1500pF), while logic high (VCC) activates extended mode, multiplying timeout by 500× (e.g., 2s with same capacitor). A WDS transition always resets the watchdog timer, enabling dynamic mode switching during µP runtime.
Can MAX6304CPA+ monitor voltages other than VCC?
Yes, MAX6304CPA+ can monitor any DC voltage via the RESET IN pin using an external resistor divider. The device references its internal 1.22V bandgap, so VRST = 1.22 × (R1 + R2)/R2. This allows precise supervision of 1.8V, 2.5V, 3.3V, or custom rails-common in multi-voltage systems like FPGAs or mixed-signal SoCs.
What capacitor type is recommended for SRT and SWT on MAX6304CPA+?
Ceramic capacitors are recommended for both SRT and SWT pins on MAX6304CPA+ due to their low leakage (<10nA) and stability. Film or tantalum types may introduce timing errors because the internal 500nA precision current source is sensitive to leakage. Typical values range from 100pF to 10nF, yielding reset/watchdog timeouts from ~0.3ms to ~30s depending on configuration.
Is MAX6304CPA+ pin-compatible with other members of the MAX6301–MAX6304 family?
Yes, MAX6304CPA+ shares identical 8-pin PDIP pinout and electrical interface with MAX6301CPA+, MAX6302CPA+, and MAX6303CPA+. The only functional differences are reset polarity (active-high vs. active-low) and output structure (push-pull vs. open-drain), which are determined by internal mask options-not pin assignment or timing behavior.
MAX6304CPA+ 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 High
- Reset Timeout:
- 2.8ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX6304CPA+ FAQ
1.How can I place an order for MAX6304CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304CPA+ 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 MAX6304CPA+ reliable?
The price and inventory of MAX6304CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304CPA+ is usually 5 days.
3.What payment methods are accepted for MAX6304CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304CPA+?
MAX6304CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304CPA+ 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 MAX6304CPA+?
For technical support, including MAX6304CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304CPA+ requirements.
6.How does Aetrix verify that MAX6304CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX6304CPA+ 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 MAX6304CPA+ meets industry standards.
7.What is the process for return or replacement of MAX6304CPA+?
All MAX6304CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304CPA+, 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 MAX6304CPA+ part is unused and in its original packaging.
Return procedure for MAX6304CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6304CPA+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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