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Analog Devices Inc./Maxim Integrated MAX6304ESA+
- Part No.:
- MAX6304ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6304ESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,224
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Product details
Overview
The MAX6304ESA+ from Maxim Integrated is an active-high, push-pull output microprocessor supervisory circuit designed for reliable reset and watchdog monitoring in low-power embedded systems. It features adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2ms with 1500pF), adjustable watchdog timeout (2.8–5.2ms normal / 1.4–2.6s extended mode), 4µA supply current, and immunity to power-supply transients - used in battery-powered medical instruments and industrial controllers requiring precise brownout detection.
For engineers reviewing the MAX6304ESA+ datasheet, MAX6304ESA+ pinout, MAX6304ESA+ application, or MAX6304ESA+ equivalent, key selection criteria include its active-high push-pull reset output, -40°C to +85°C industrial temperature range, SO-8 package, and dual-mode watchdog with 500× timeout extension via WDS pin - critical for wake-up timer and fail-safe µP recovery designs.
Technical Context
The MAX6304ESA+ implements a precision bandgap reference (1.22V) feeding a comparator that monitors RESET IN voltage via external resistor divider. Its reset assertion is guaranteed valid down to VCC = 1.31V, with hysteresis of 20mV and input leakage <±1nA.
Watchdog operation uses two independent precision current sources (500nA at SRT/SWT) to charge timing capacitors; WDS pin selects between normal (tWD = 2.67 × CSWT) and extended (tWD × 500) modes, with internal WDI driver enabling watchdog disable in extended mode when WDI is unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-high, push-pull - drives high during reset assertion without external pull-up, compatible with bidirectional µP reset pins. |
| Supply Voltage Range | +1.31V to +5.5V - supports operation down to 1.31V, enabling supervision of low-voltage µPs and brownout detection before full logic activation. |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable equipment and remote sensors. |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - allows precise reset point setting (e.g., 3.3V ±2% or 2.5V ±3%) using external resistors. |
| Reset Timeout Range | 2.8–5.2ms (with 1500pF on SRT) - configurable to match µP initialization time, avoiding premature release or excessive hold. |
| Watchdog Timeout | 2.8–5.2ms (normal) or 1.4–2.6s (extended, WDS = VCC) - supports both fast hang detection and ultra-low-power wake-up timer applications. |
| Power-Supply Transient Immunity | Withstands ≤50µs negative transients of 100mV below VRST - prevents false resets during switching noise or load dumps. |
Pinout & Package
MAX6304ESA+ is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, RoHS-compliant and lead-free, with 1.27mm pitch and 4.9mm × 3.9mm body size.
| 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; leakage <±1nA ensures stable threshold. |
| 2 - GND | Ground reference | Common return for all internal circuits and timing current sources; must be low-impedance to avoid timing errors on SRT/SWT. |
| 3 - SRT | Reset timeout capacitor connection | Precision 500nA current source charges CSRT; tRP = 2.67 × CSRT (pF → µs); requires low-leakage ceramic capacitor. |
| 4 - SWT | Watchdog timeout capacitor connection | Precision 500nA current source charges CSWT; tWD = 2.67 × CSWT (pF → µs); same capacitor requirements as SRT. |
| 5 - WDS | Watchdog mode select | Logic input: GND = normal mode (ms timeout), VCC = extended mode (×500 timeout); transition resets watchdog timer. |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising/falling transition within timeout period clears watchdog; in extended mode, unconnected = auto-disable. |
| 7 - RESET | Active-high push-pull reset output | Drives high during reset assertion; VOH ≥ VCC − 0.4V @ 0.8mA; VOL ≤ 0.4V @ 3.2mA; no external pull-up needed. |
| 8 - VCC | Supply voltage input | +1.31V to +5.5V operation; bypass with 0.1µF ceramic capacitor placed adjacent to pin to suppress supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable to any voltage ≥1.22V using two external resistors - enables supervision of 1.8V, 2.5V, 3.3V, or 5V rails without redesign. |
| 500× watchdog timeout multiplier | WDS pin toggles between ms-scale hang detection and second-scale wake-up intervals - eliminates need for separate RTC or timer IC. |
| Guaranteed reset assertion at VCC ≥1.31V | Ensures valid reset signal even during deep brownout - critical for preventing corrupted memory writes or state machine lockup. |
| Power-supply transient immunity | Rejects ≤50µs glitches up to 100mV below VRST - maintains system stability in noisy automotive or industrial environments. |
| Low-leakage timing inputs (SRT/SWT) | 500nA precision current sources require <10nA capacitor leakage - enables accurate, temperature-stable timeout periods across -40°C to +85°C. |
Applications
| Medical Patient Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Continuous vital-sign acquisition in portable ECG units powered by coin-cell batteries. IC Role / Device Role / Timing Role: Supervises 3.3V µP supply and triggers hard reset if firmware hangs during sensor data processing. Use Value: 4µA quiescent current extends battery life >3 years; adjustable 3.0V reset threshold prevents spurious resets during brief voltage sags. | Use Scenario: Real-time I/O control in factory-floor programmable logic controllers exposed to motor-drive EMI. IC Role / Device Role / Timing Role: Monitors 5V system rail and asserts active-high RESET to ARM Cortex-M4 core upon undervoltage or software lockup. Use Value: Transient immunity rejects 40µs/80mV noise spikes from nearby VFDs; push-pull output ensures clean reset edge without pull-up resistor loading. |
| Smart Energy Meter | Wireless Sensor Node |
Use Scenario: Tamper-resistant electricity meter with metrology SoC and secure bootloader. IC Role / Device Role / Timing Role: Provides dual-function supervision: reset during power-up and watchdog-triggered recovery after cryptographic verification failure. Use Value: WDS-controlled extended watchdog (2.2s timeout) enables periodic wake-up for RF transmission while minimizing µP active time. | Use Scenario: LoRaWAN environmental sensor node operating on AA batteries for 10+ years. IC Role / Device Role / Timing Role: Generates precise 4ms reset pulse on cold start and monitors µP activity during 15-minute sleep cycles. Use Value: Adjustable SRT capacitor sets exact reset duration matching flash programming time; open-drain alternative not required due to push-pull drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302ESA+ | Active-high, open-drain RESET output; requires external pull-up resistor; identical timing, threshold, and supply specs. | Suitable where µP reset pin is pulled up externally or shared with other open-drain sources. | Select MAX6302ESA+ only if board layout already includes pull-up or system-level reset arbitration is needed. |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; 2.5µA ICC; push-pull active-high output; no adjustable watchdog; 6-pin SOT-23 package. | Used in space-constrained designs where fixed threshold suffices and watchdog is handled in firmware. | Choose TPS3808G12DBVR for cost-sensitive, compact applications without need for field-adjustable timing or dual-mode watchdog. |
Compared with MAX6302ESA+, the MAX6304ESA+ eliminates external pull-up components and simplifies PCB routing; versus TPS3808G12DBVR, it provides design flexibility through adjustable reset/watchdog thresholds and extended-mode wake-up capability - essential for long-life, field-deployed systems.
Availability
MAX6304ESA+ is available at Aetrix Electronics and suitable for medical instrumentation, industrial PLCs, smart energy meters, and wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6304ESA+ 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 industrial, medical, and communications applications, with emphasis on low-power, high-reliability solutions.
The MAX6301–MAX6304 family was engineered specifically for robust µP supervision in battery-powered and noise-prone environments, delivering adjustable timing, wide supply range, and transient-hardened reset generation.
FAQ
What is the minimum VCC required for MAX6304ESA+ to assert a valid RESET signal?
The MAX6304ESA+ guarantees valid active-high RESET assertion for VCC ≥ 1.31V. Below this voltage, output drive strength degrades; for operation down to 0V, a 100kΩ pullup resistor between RESET and VCC is recommended per Figure 10 in the datasheet. This ensures predictable logic-high state during deep brownout conditions encountered in MAX6304ESA+ deployments.
How does the WDS pin affect watchdog behavior in MAX6304ESA+?
In MAX6304ESA+, the WDS pin selects watchdog mode: grounded = normal mode (timeout = 2.67 × CSWT in ms); tied to VCC = extended mode (timeout = 500 × normal value, e.g., 2.2s with 1µF). A WDS transition resets the watchdog timer. In extended mode, leaving WDI unconnected disables the watchdog function - a feature unique to MAX6304ESA+ among its family.
Can MAX6304ESA+ monitor voltages other than VCC?
Yes. The MAX6304ESA+ RESET IN pin accepts any DC voltage source - such as a battery, analog sensor rail, or isolated DC-DC output - via an external resistor divider. The reset threshold is calculated as VRST = 1.22 × (R1 + R2)/R2. This allows direct supervision of 1.8V, 2.5V, or 3.3V subsystems independently of the main VCC rail in MAX6304ESA+ designs.
What capacitor type is required for SRT and SWT pins on MAX6304ESA+?
MAX6304ESA+ requires low-leakage ceramic capacitors (≤10nA) for SRT and SWT timing inputs. X7R or C0G dielectrics are recommended. Electrolytic or high-leakage film capacitors cause timing errors due to the 500nA precision current sources. Typical values: 1500pF yields 4.0ms reset timeout and 4.0ms basic watchdog timeout in MAX6304ESA+ circuits.
Is MAX6304ESA+ pin-compatible with other devices in the MAX6301–MAX6304 family?
Yes - all MAX6301–MAX6304 variants share identical 8-pin SO, PDIP, and µMAX packages and pinouts. The MAX6304ESA+ uses the same footprint as MAX6301ESA+, MAX6302ESA+, and MAX6303ESA+. Functionally, only RESET output polarity (active-high vs. active-low) and drive type (push-pull vs. open-drain) differ; no PCB changes are needed when substituting within the same package variant like MAX6304ESA+.
MAX6304ESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6304ESA+ FAQ
1.How can I place an order for MAX6304ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304ESA+ 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 MAX6304ESA+ reliable?
The price and inventory of MAX6304ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304ESA+ is usually 5 days.
3.What payment methods are accepted for MAX6304ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304ESA+?
MAX6304ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304ESA+ 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 MAX6304ESA+?
For technical support, including MAX6304ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304ESA+ requirements.
6.How does Aetrix verify that MAX6304ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6304ESA+ 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 MAX6304ESA+ meets industry standards.
7.What is the process for return or replacement of MAX6304ESA+?
All MAX6304ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304ESA+, 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 MAX6304ESA+ part is unused and in its original packaging.
Return procedure for MAX6304ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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