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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:1,919
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Product details
Overview
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/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 MAX6304CPA datasheet, MAX6304CPA pinout, MAX6304CPA application, or MAX6304CPA equivalent, key selection criteria include its active-high push-pull RESET output, guaranteed operation down to VCC = 1.31V, 500× watchdog timeout multiplier, power-supply transient immunity, and compatibility with manual reset and wake-up timer implementations.
Technical Context
The MAX6304CPA implements a precision bandgap-based reset comparator referenced to 1.22V, with external resistor divider programming of VRST. Its reset assertion is synchronized to a programmable timeout period (tRP) initiated upon threshold violation.
Its watchdog timer uses a 500nA precision current source at SWT to generate timing intervals; mode selection (normal vs. 500× extended) is controlled by the logic level on WDS, and watchdog clearing occurs on transitions at WDI or WDS - not on level alone.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - supports low-voltage µP systems including 1.8V and 3.3V rails |
| Quiescent Current | 4µA typical - enables multi-year operation in coin-cell–powered portable equipment |
| Reset Threshold Reference | 1.22V internal - sets minimum programmable VRST; actual threshold determined by R1/R2 ratio |
| Reset Timeout Period | 2.8ms to 5.2ms (with CSRT = 1500pF) - ensures µP initialization completes before release |
| Watchdog Timeout (Normal) | 2.8ms to 5.2ms (CSWT = 1500pF, WDS = GND) - matches typical firmware service intervals |
| Watchdog Timeout (Extended) | 1.4s to 2.6s (CSWT = 1500pF, WDS = VCC) - enables ultra-low-power sleep/wake cycles |
| RESET Output Type | Push-pull, active-high - drives high without external pull-up; compatible with bidirectional µP reset pins |
Pinout & Package
MAX6304CPA is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width, through-hole mounting, and RoHS-compliant lead finish (Pb-free option available with '+' suffix).
| 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 |
| 2 GND | Ground reference | Analog and digital ground common point; must be low-impedance return path for timing currents |
| 3 SRT | Reset timeout capacitor connection | Connects to precision 500nA current source; tRP = 2.67 × CSRT (CSRT in pF → tRP in µs) |
| 4 SWT | Watchdog timeout capacitor connection | Connects to same 500nA current source as SRT; tWD = 2.67 × CSWT (CSWT in pF → tWD in µs) |
| 5 WDS | Watchdog mode select | Logic-low = normal mode (ms timeout); logic-high = extended mode (500× multiplier, s timeout) |
| 6 WDI | Watchdog input | Rising/falling edge-triggered; clears watchdog timer on transition; high-impedance CMOS input in normal mode |
| 7 RESET | Active-high push-pull reset output | Drives high during reset assertion; sinks current when low; no external pull-up required |
| 8 VCC | Power supply input | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; supports 1.31V–5.5V operation |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Programmable above 1.22V using two external resistors - enables monitoring of 1.8V, 2.5V, 3.3V, or 5V rails |
| 500× watchdog timeout multiplier | WDS pin selects extended mode - allows >20-minute timeouts with 1µF capacitor, enabling deep-sleep wake-up timers |
| Power-supply transient immunity | Immune to negative-going VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in noisy environments |
| Guaranteed RESET assertion at low VCC | Valid active-high RESET output guaranteed for VCC ≥1.31V - ensures reliable reset even during brownout |
| Manual reset support | RESET IN accepts momentary short-to-ground - enables hardware reset button without additional logic |
Applications
| Medical Portable Monitors | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Wearable ECG device operating from CR2032 coin cell, entering deep sleep between measurements. IC Role / Device Role / Timing Role: MAX6304CPA provides active-high RESET to initialize MCU on wake-up and monitors MCU activity via WDI to detect firmware hangs. Use Value: Extended watchdog mode (WDS = VCC) enables 2+ minute timeouts with 1µF capacitor, minimizing wake-ups while guaranteeing recovery from lockup. |
Use Scenario: Environmental sensor node logging temperature/humidity every 10 minutes, powered by AA batteries. IC Role / Device Role / Timing Role: MAX6304CPA supervises 3.3V system rail and asserts RESET if voltage drops below 2.7V; WDI is toggled by MCU before sleep. Use Value: Adjustable reset threshold (via R1/R2) precisely targets 2.7V brownout detection; 4µA quiescent current extends battery life beyond 5 years. |
| Industrial PLC I/O Modules | Set-Top Box Power Management |
|
Use Scenario: DIN-rail mounted controller with isolated 5V DC-DC converter powering FPGA and ARM core. IC Role / Device Role / Timing Role: MAX6304CPA monitors post-regulator 5V rail and generates clean, glitch-immune RESET signal for deterministic boot. Use Value: Transient immunity prevents false resets during relay switching or motor startup; push-pull output drives FPGA reset pin directly. |
Use Scenario: Consumer STB with standby/sleep modes and fast wake-from-standby requirement. IC Role / Device Role / Timing Role: MAX6304CPA manages power-on sequencing and detects software stalls during channel change or firmware update. Use Value: Active-high RESET aligns with STB SoC reset polarity; adjustable timeout ensures sufficient time for DDR initialization before release. |
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 | Suitable where bus-sharing or wired-OR reset lines are needed | Select MAX6302CPA only if open-drain topology is required for system-level reset arbitration |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; no external resistor adjustment; 360nA quiescent current | Better suited for ultra-low-power always-on monitoring where threshold is fixed | Choose TPS3808G12DBVR when minimal supply current is critical and 1.2V threshold suffices |
Compared with MAX6302CPA, MAX6304CPA eliminates external pull-up components and simplifies layout; compared with TPS3808G12DBVR, it trades lower quiescent current for full adjustability of both reset and watchdog thresholds - essential for multi-rail or legacy µP designs.
Availability
MAX6304CPA is available at Aetrix Electronics and suitable for medical portable monitors, battery-powered data loggers, industrial PLC I/O modules, and set-top box power management requiring stable component supply across extended production lifecycles.
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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX6301–MAX6304 family was designed specifically for low-power microprocessor supervision in space-constrained, battery-sensitive systems - delivering adjustable reset/watchdog functionality in miniature PDIP, SO, and µMAX packages.
FAQ
What is the minimum supply voltage required for MAX6304CPA to assert RESET?
The MAX6304CPA guarantees valid active-high RESET assertion for VCC ≥ 1.31V. Below this, RESET behavior is not specified. This threshold ensures reliable operation in 1.8V and higher systems, and the device remains functional down to VCC = 1.31V while maintaining accurate reset timing and watchdog functionality. The MAX6304CPA does not operate below 1.31V.
How do I configure the MAX6304CPA for a 3.3V supply brownout detection at 2.9V?
To set a 2.9V reset threshold on MAX6304CPA, use the formula VRST = 1.22 × (R1 + R2)/R2. With R2 = 1MΩ, solve for R1 ≈ 1.39MΩ. Connect R1 between VCC and RESET IN, and R2 between RESET IN and GND. Confirm with oscilloscope that RESET asserts cleanly at 2.9V drop and holds for the programmed tRP duration.
Can the watchdog function be disabled on the MAX6304CPA?
Yes - in extended mode (WDS = VCC), the watchdog function is automatically disabled if WDI is left unconnected or driven three-state, because the internal driver pulses WDI near timeout. In normal mode (WDS = GND), WDI must be actively toggled; leaving it floating is prohibited and may cause unpredictable resets. The MAX6304CPA does not offer a dedicated disable pin.
What capacitor value gives a 10-second watchdog timeout in extended mode?
In extended mode (WDS = VCC), a 10-second watchdog timeout requires CSWT ≈ 22nF. Derive from tWD(extended) = 500 × 2.67 × CSWT (with CSWT in farads). For CSWT = 22nF, tWD ≈ 500 × 2.67 × 22×10⁻⁹ ≈ 10 seconds. Use low-leakage ceramic capacitor; avoid electrolytics or high-DA dielectrics that introduce timing error.
Is the MAX6304CPA pin-compatible with other parts in the MAX6301–MAX6304 family?
Yes - all MAX6301–MAX6304 variants share identical 8-pin PDIP, SO, and µMAX footprints and pinouts. The MAX6304CPA differs only in output configuration (active-high push-pull), so PCBs designed for MAX6301CPA, MAX6302CPA, or MAX6303CPA can accept MAX6304CPA without layout changes, provided the RESET polarity and drive strength match system requirements.
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.
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