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Analog Devices Inc./Maxim Integrated MAX6302EPA+
- Part No.:
- MAX6302EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6302EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,785
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Product details
Overview
MAX6302EPA+ from Maxim Integrated is an active-high, open-drain microprocessor supervisory circuit designed for reliable reset and watchdog monitoring in industrial-temperature embedded systems. It features adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2 ms with 1500pF), adjustable watchdog timeout (2.8–5.2 ms normal / 1.4–2.6 s extended), 500× watchdog multiplier via WDS pin, and 4µA supply current. It is used in battery-powered medical instruments requiring brownout immunity and deterministic reset assertion.
For engineers reviewing the MAX6302EPA+ datasheet, MAX6302EPA+ pinout, MAX6302EPA+ application, or MAX6302EPA+ equivalent, this page delivers verified electrical parameters, temperature-rated package details (-40°C to +85°C PDIP), functional distinctions among MAX6301–MAX6304 variants, and real-world timing behavior under transient conditions - all critical for power-sensitive, safety-critical µP supervision.
Technical Context
The MAX6302EPA+ implements a precision bandgap-based reset comparator referenced to 1.22V, with external resistor divider programming of VRST = 1.22 × (R1 + R2)/R2. Its reset output is active-high and open-drain, requiring an external pullup, and guarantees valid logic levels for VCC ≥ 1.31V.
Watchdog operation uses two independent precision current sources (500nA) at SRT and SWT pins to charge external capacitors; timeout periods scale linearly with capacitance (tRP = 2.67 × CSRT, tWD = 2.67 × CSWT). WDS pin selects between normal mode (WDS = GND) and extended mode (WDS = VCC), enabling 500× timeout multiplication without software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.31V to +5.5V - supports low-voltage µPs down to 1.31V while maintaining guaranteed RESET assertion. |
| Quiescent Supply Current | 4.0µA typical - enables multi-year battery life in portable medical monitors and remote sensors. |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - allows precise brownout detection with external resistor divider tuning. |
| Reset Timeout Period | 2.8–5.2ms (with 1500pF on SRT) - configurable delay ensures µP initialization completes before release. |
| Watchdog Timeout (Normal) | 2.8–5.2ms (with 1500pF on SWT) - short interval suitable for fast-response firmware watchdog checks. |
| Watchdog Timeout (Extended) | 1.4–2.6s (with 1500pF on SWT, WDS = VCC) - enables ultra-low-power sleep/wake cycles without CPU wake-ups. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive under-hood environments. |
| Package | 8-pin PDIP - through-hole mounting compatible with legacy production and manual prototyping. |
Pinout & Package
MAX6302EPA+ is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width, leaded and RoHS-compliant (+ suffix) options. Pin 1 is top-left corner (notch side), pin 8 is top-right.
| 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 | Analog and digital ground common point; must be low-impedance return path for precision timing currents. |
| 3 - SRT | Reset timeout capacitor terminal | 500nA constant-current source charges CSRT; tRP = 2.67 × CSRT (pF → µs). |
| 4 - SWT | Watchdog timeout capacitor terminal | 500nA constant-current source charges CSWT; tWD = 2.67 × CSWT (pF → µs). |
| 5 - WDS | Watchdog mode select | Logic input: GND = normal mode (ms timeout), VCC = extended mode (500× timeout, seconds). |
| 6 - WDI | Watchdog input | Edge-triggered input; rising/falling transition resets watchdog timer; high-impedance in normal mode. |
| 7 - RESET | Active-high open-drain reset output | Drives high only when pulled up externally; asserts high during reset condition (VIN < VRST). |
| 8 - VCC | Positive supply | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; powers internal bandgap and comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Programmable from 1.22V upward using two external resistors - eliminates need for fixed-threshold parts across diverse supply rails. |
| 500× watchdog timeout multiplier | Hardware-selectable via WDS pin - enables single BOM part to serve both fast-fault detection and ultra-low-power wake-up timer roles. |
| Power-supply transient immunity | Rejects negative-going VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in noisy industrial power domains. |
| Guaranteed RESET assertion down to VCC = 1.31V | Valid active-high output level ensured above minimum operating voltage - avoids undefined reset state during brownout recovery. |
| Low-leakage timing inputs (SRT/SWT) | 500nA precision current sources require <10nA capacitor leakage - enables stable ms-to-second timing with standard X7R ceramics. |
| Open-drain active-high RESET output | Allows wired-OR with other reset sources and compatibility with bidirectional µP reset pins (e.g., 68HC11) using single pullup. |
Applications
| Medical Infusion Pumps | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous infusion delivery with real-time motor control, sensor feedback, and battery backup. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers hardware reset if voltage drops below 2.9V during AC loss or battery sag. Use Value: Prevents motor runaway or dosage miscalculation by asserting RESET within 63µs of VCC fall, with 4ms hold time for safe controller shutdown. |
Use Scenario: DIN-rail mounted I/O module operating in factory-floor environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Monitors isolated 5V DC-DC output and provides watchdog supervision of ARM Cortex-M4 firmware execution. Use Value: Detects firmware lockup within 3ms (normal mode) or enables 2s sleep-wake cycles (extended mode), reducing average system power by >40%. |
| Portable ECG Monitors | Battery-Powered Smart Meters |
Use Scenario: Handheld diagnostic device powered by two AA cells, requiring >5-year shelf life and cold-temperature operation. IC Role / Device Role / Timing Role: Provides brownout reset at 1.8V and disables watchdog during deep-sleep (WDS = VCC, WDI floating). Use Value: Achieves 4µA total system quiescent current in sleep mode while guaranteeing valid reset assertion down to -40°C ambient. |
Use Scenario: AMI smart meter with RF mesh communication, operating unattended for 15+ years on primary lithium battery. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and implements wake-up timer via WDS toggling to awaken MCU every 30 seconds. Use Value: Eliminates need for external RTC or timer IC; leverages built-in 500× watchdog multiplier to achieve long intervals with minimal external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6304EPA+ | Push-pull active-high RESET output (vs. MAX6302EPA+'s open-drain); identical timing, threshold, and temperature specs. | Eliminates need for external pullup resistor; better suited for systems with multiple reset sources sharing a common bus. | Select MAX6304EPA+ when board space is constrained and no wired-OR reset merging is required. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; 2.5µA ICC; push-pull active-low RESET; no adjustable watchdog or WDS pin. | Lacks programmability - suitable only for simple power-on reset where voltage margin is fixed and watchdog not needed. | Choose TPS3808G125DBVR only for cost-sensitive, non-watchdog applications with strict 1.25V threshold requirement. |
Compared with MAX6304EPA+, MAX6302EPA+ offers open-drain flexibility for shared reset buses but requires an external pullup; compared with TPS3808G125DBVR, it trades fixed-threshold simplicity for full adjustability and robust watchdog configurability - essential for field-deployed, long-life embedded systems.
Availability
MAX6302EPA+ is available at Aetrix Electronics and suitable for medical instrumentation, industrial PLCs, portable diagnostics, and battery-powered smart meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6302EPA+ 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, emphasizing low power, high reliability, and integration.
The MAX6301–MAX6304 family was engineered specifically for µP supervision in resource-constrained, battery-operated, and thermally demanding systems - delivering adjustable reset/watchdog functionality with sub-µA quiescent current and robust transient immunity.
FAQ
What is the minimum VCC required for guaranteed RESET assertion in MAX6302EPA+?
The MAX6302EPA+ guarantees valid active-high RESET output for VCC ≥ 1.31V. Below this voltage, output drive capability degrades; the device remains functional down to VCC = 1V, but RESET logic levels are not assured. This specification is confirmed in the Electrical Characteristics table under "Operating Voltage Range" for MAX6302/MAX6304 variants. Designers must ensure system brownout thresholds align with this 1.31V minimum to avoid undefined reset states.
How does the WDS pin affect watchdog behavior in MAX6302EPA+?
In MAX6302EPA+, the WDS pin selects watchdog mode: grounded (WDS = GND) enables normal mode with millisecond-scale timeout (e.g., 4ms with 1500pF), while tied to VCC enables extended mode multiplying timeout by 500× (e.g., 2s with same capacitor). A state change on WDS resets the watchdog timer to zero. This hardware-selectable feature allows one MAX6302EPA+ design to support both fast fault detection and ultra-low-power wake-up timing without firmware changes.
Can MAX6302EPA+ monitor voltages other than VCC?
Yes - MAX6302EPA+ monitors any DC voltage applied to the RESET IN pin via an external resistor divider. The reset threshold VRST is calculated as 1.22 × (R1 + R2)/R2, where R1 connects to the monitored voltage and R2 to ground. This enables supervision of I/O rails, battery voltages, or isolated DC-DC outputs. Layout best practices require short, low-leakage traces to RESET IN to prevent threshold drift from stray capacitance or probe loading.
What capacitor type is recommended for SRT and SWT pins on MAX6302EPA+?
Ceramic capacitors (X7R or C0G) are recommended for SRT and SWT pins in MAX6302EPA+ due to their low leakage (<10nA) and stability over temperature. The timing currents (500nA) at these pins are highly sensitive to capacitor leakage; electrolytic or tantalum types introduce excessive leakage that causes significant timeout errors. For a 4ms reset timeout, CSRT = 1500pF ceramic placed close to the pin ensures accuracy within ±30% across -40°C to +85°C.
Is MAX6302EPA+ pin-compatible with other members of the MAX6301–MAX6304 family?
Yes - MAX6302EPA+ shares identical 8-pin PDIP pinout and footprint with MAX6301EPA+, MAX6303EPA+, and MAX6304EPA+. All four variants use the same physical layout, allowing drop-in replacement in PCB designs. However, functional differences exist: MAX6302EPA+ has active-high open-drain RESET, while MAX6301EPA+ is active-low open-drain, MAX6303EPA+ is active-low push-pull, and MAX6304EPA+ is active-high push-pull. Output configuration must be verified before substitution.
MAX6302EPA+ 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:
- Open Drain or Open Collector
- 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
MAX6302EPA+ FAQ
1.How can I place an order for MAX6302EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6302EPA+ 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 MAX6302EPA+ reliable?
The price and inventory of MAX6302EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6302EPA+ is usually 5 days.
3.What payment methods are accepted for MAX6302EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6302EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6302EPA+?
MAX6302EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6302EPA+ 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 MAX6302EPA+?
For technical support, including MAX6302EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6302EPA+ requirements.
6.How does Aetrix verify that MAX6302EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX6302EPA+ 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 MAX6302EPA+ meets industry standards.
7.What is the process for return or replacement of MAX6302EPA+?
All MAX6302EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6302EPA+, 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 MAX6302EPA+ part is unused and in its original packaging.
Return procedure for MAX6302EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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