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Analog Devices Inc./Maxim Integrated MAX6304EPA+
- Part No.:
- MAX6304EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6304EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
MAX6304EPA+ from Maxim Integrated is an active-high, push-pull µP supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2 ms with 1500pF), and dual-mode watchdog timer (normal mode: 2.8–5.2 ms; extended mode: up to 2.6 s with same capacitor). It operates from +1.31V to +5.5V, draws only 4µA supply current, and features power-supply transient immunity - used in battery-powered medical instruments and industrial controllers requiring reliable brownout detection and software hang protection.
For engineers reviewing the MAX6304EPA+ datasheet, MAX6304EPA+ pinout, MAX6304EPA+ application, or MAX6304EPA+ equivalent, this page delivers verified functional identity, confirmed -40°C to +85°C temperature range, exact PDIP-8 package mapping, validated reset/watchdog timing behavior, and two field-validated alternative parts with documented technical differences.
Technical Context
The MAX6304EPA+ implements a precision bandgap-based reset comparator with 1.22V internal reference, enabling externally adjustable reset thresholds via resistor divider on RESET IN. Its watchdog timer uses a 500nA precision current source at SWT to generate timeout periods scalable by external capacitor value and WDS logic state.
It supports active-high push-pull RESET output with guaranteed VOH ≥ VCC – 0.3V (at VCC ≥ 4.5V, ISOURCE = 0.8mA) and VOL ≤ 0.4V (at VCC ≥ 4.5V, ISINK = 3.2mA), and features dedicated WDI transition detection (≥30ns pulse width) and WDS-controlled mode switching that resets the watchdog counter on state change.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.31V to +5.5V - supports operation down to low-voltage microcontrollers and ensures valid reset assertion even during partial power-up. |
| Quiescent Supply Current | 4.0µA typical - enables multi-year battery life in portable and remote monitoring equipment. |
| Reset Threshold Accuracy | 1.220V ±25mV at +25°C - sets precise brownout detection point; external resistor network scales threshold above 1.22V. |
| Reset Timeout Period | 2.8–5.2ms with 1500pF on SRT - programmable delay prevents premature µP release before power stabilization. |
| Watchdog Timeout (Normal) | 2.8–5.2ms with 1500pF on SWT - matches fast-boot firmware execution cycles without false triggers. |
| Watchdog Timeout (Extended) | 1.4–2.6s with same 1500pF capacitor when WDS = VCC - enables long sleep intervals in energy-conscious wake-up timer applications. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive under-hood environments where thermal stability is critical. |
Pinout & Package
MAX6304EPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is lead(Pb)-free/RoHS-compliant (indicated by '+' suffix).
| 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 = 1.22 × (R1 + R2)/R2; leakage < ±1nA avoids threshold drift. |
| 2 GND | Ground reference | Common return for all internal circuits; must be low-impedance connection to minimize noise coupling into SRT/SWT current sources. |
| 3 SRT | Reset timeout capacitor node | Sinks 500nA precision current; CSRT in pF sets tRP = 2.67 × CSRT µs; requires low-leakage ceramic capacitor. |
| 4 SWT | Watchdog timeout capacitor node | Sinks identical 500nA current; CSWT in pF sets tWD = 2.67 × CSWT µs in normal mode; leakage <10nA essential. |
| 5 WDS | Watchdog mode select | Logic high (VCC) enables 500× extended timeout; logic low (GND) selects normal mode; state change resets watchdog counter. |
| 6 WDI | Watchdog input | Rising/falling edge resets watchdog timer; minimum pulse width 30ns; in extended mode, unconnected WDI is auto-serviced. |
| 7 RESET | Active-high push-pull output | Drives µP reset pin directly; VOH ≥ VCC – 0.3V, VOL ≤ 0.4V; no external pullup required; compatible with bidirectional µP reset I/O. |
| 8 VCC | Power supply input | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; supports operation down to 1.31V with full functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable to any voltage ≥1.22V using two external resistors - eliminates need for fixed-threshold variants across diverse supply rails. |
| Dual-mode watchdog timer | 500× timeout multiplier via WDS pin - enables single hardware design to support both fast-firmware and ultra-low-power wake-up modes. |
| Power-supply transient immunity | Rejects negative-going VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in electrically noisy industrial environments. |
| Guaranteed reset assertion at low VCC | RESET remains valid down to VCC = 1.31V - ensures reliable µP initialization during slow-ramp or brownout conditions. |
| Low-leakage timing nodes | SRT/SWT draw precisely 500nA - allows use of small, stable ceramic capacitors instead of electrolytics, improving long-term timing accuracy. |
Applications
| Medical Infusion Pumps | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered infusion pump monitors motor driver voltage and system rail during dose delivery and standby. IC Role / Device Role / Timing Role: MAX6304EPA+ continuously supervises VCC and asserts active-high RESET if voltage drops below programmed 3.0V threshold during motor surge. Use Value: Prevents erratic motor control due to brownout; 4µA quiescent current extends battery life beyond 18 months in standby mode. |
Use Scenario: Programmable logic controller operates in factory-floor environment with 24VDC supply and frequent EMI transients. IC Role / Device Role / Timing Role: MAX6304EPA+ watches µP activity via WDI and triggers reset if firmware hangs; WDS tied to I/O pin enables dynamic timeout scaling. Use Value: Eliminates need for manual reboot after electromagnetic interference events; 500× extended mode supports 2-second watchdog window during complex ladder logic scans. |
| Portable Diagnostic Handhelds | Smart Energy Meters |
Use Scenario: Handheld ultrasound device powers from Li-ion battery and enters deep sleep between scans. IC Role / Device Role / Timing Role: MAX6304EPA+ acts as wake-up timer: µP pulls WDS high before sleep, triggering 2.6s extended watchdog timeout to wake itself. Use Value: Reduces average system current to <10µA; eliminates external RTC or timer IC, cutting BOM cost and PCB area. |
Use Scenario: Revenue-grade electricity meter logs data every 15 minutes and communicates via PLC or RF. IC Role / Device Role / Timing Role: MAX6304EPA+ supervises 3.3V logic rail and monitors µP watchdog; RESET output drives meter's safety-critical reset domain. Use Value: Meets IEC 62056-61 fault tolerance requirements; adjustable reset threshold accommodates aging DC-DC converter output drift over 15-year lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302EPA+ | Active-high open-drain RESET output; lacks push-pull drive strength; VOL undefined at low VCC. | Requires external pullup resistor; unsuitable for direct-drive of µP reset pins with weak internal pullups. | Select MAX6302EPA+ only when interfacing with legacy µPs requiring open-drain reset signaling or level translation. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no adjustable watchdog; 1.6µA supply current; SOT-23-6 package. | Cannot monitor non-3.3V rails or implement wake-up timer; smaller footprint but zero configurability. | Choose TPS3808G33DBVR for cost-sensitive, single-rail designs where reset voltage and timeout are static and space-constrained. |
Compared with MAX6302EPA+, MAX6304EPA+ provides stronger active-high push-pull drive and eliminates external component dependency; compared with TPS3808G33DBVR, it trades lower quiescent current for full adjustability of threshold, reset delay, and watchdog timeout - critical for multi-rail, battery-life-optimized, or firmware-adaptive systems.
Availability
MAX6304EPA+ is available at Aetrix Electronics and suitable for medical instrumentation, industrial PLCs, portable diagnostics, smart energy meters, and battery-backed controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6304EPA+ 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 demanding industrial, medical, and communications applications, with emphasis on low-power, high-reliability performance.
The MAX6301–MAX6304 family was engineered specifically for µP supervision in resource-constrained, battery-operated, and thermally harsh environments - delivering configurable reset and watchdog functions in minimal footprint with guaranteed operation down to 1.31V.
FAQ
What is the minimum operating voltage for MAX6304EPA+ to guarantee proper reset assertion?
The MAX6304EPA+ guarantees valid active-high RESET output down to VCC = 1.31V, as specified in its Electrical Characteristics table. Below this voltage, output drive capability degrades; for applications requiring reset validity down to 0V, a 100kΩ pullup resistor from RESET to VCC is recommended per the datasheet's Figure 10. This ensures predictable logic-high state during full power collapse.
Can MAX6304EPA+ monitor a 2.5V supply rail, and how is the reset threshold set?
Yes, MAX6304EPA+ can monitor a 2.5V rail using the external resistor divider on RESET IN. With VTH = 1.22V, setting R2 = 1MΩ and R1 = 1.06MΩ yields VRST = 1.22 × (1.06M + 1M)/1M ≈ 2.50V. The datasheet confirms reset threshold adjustability to "any voltage above 1.22V", and the MAX6304EPA+'s input leakage (<±1nA) ensures minimal error from high-value resistors.
How does the watchdog timeout period scale between normal and extended modes on MAX6304EPA+?
With a fixed 1500pF capacitor on SWT, MAX6304EPA+ delivers 2.8–5.2ms timeout in normal mode (WDS = GND) and 1.4–2.6s in extended mode (WDS = VCC) - a precise 500× multiplication. This ratio holds across temperature and supply voltage per the Typical Operating Characteristics graphs (toc02/toc03), enabling deterministic firmware sleep/wake timing without recalculating capacitor values.
Is MAX6304EPA+ pin-compatible with other devices in the MAX6301–MAX6304 family?
Yes, MAX6304EPA+ shares identical 8-pin PDIP pinout and electrical interface with MAX6301EPA+, MAX6302EPA+, and MAX6303EPA+. All four variants differ only in reset polarity (active-high/low) and output type (push-pull/open-drain); the MAX6304EPA+ specifically provides active-high push-pull RESET, making it drop-in replaceable where that output configuration is required.
What capacitor type is recommended for SRT and SWT connections on MAX6304EPA+?
Ceramic capacitors are explicitly recommended for SRT and SWT in the MAX6304EPA+ datasheet (page 7), due to their low leakage (<10nA) and stability. Tantalum or aluminum electrolytics are unsuitable - their leakage currents would distort the 500nA timing current, causing significant reset and watchdog timeout errors. X7R or C0G dielectrics with tight tolerance (±10%) ensure timing accuracy within datasheet limits.
MAX6304EPA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX6304EPA+ FAQ
1.How can I place an order for MAX6304EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304EPA+ 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 MAX6304EPA+ reliable?
The price and inventory of MAX6304EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304EPA+ is usually 5 days.
3.What payment methods are accepted for MAX6304EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304EPA+?
MAX6304EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304EPA+ 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 MAX6304EPA+?
For technical support, including MAX6304EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304EPA+ requirements.
6.How does Aetrix verify that MAX6304EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX6304EPA+ 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 MAX6304EPA+ meets industry standards.
7.What is the process for return or replacement of MAX6304EPA+?
All MAX6304EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304EPA+, 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 MAX6304EPA+ part is unused and in its original packaging.
Return procedure for MAX6304EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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